CN108233919A - Fire alarm double rail logic circuit and implementation method based on strand displacement - Google Patents

Abstract

The present invention proposes a dual-track logic circuit for fire alarm based on chain replacement and its implementation method, constructs a four-input fire alarm circuit system based on the reaction mechanism of DNA chain replacement, and builds smoke, temperature, light, and alarm devices The digital logic circuit of the four-input fire alarm circuit operation operation uses the dual-rail logic idea to convert the digital logic circuit into a dual-rail logic circuit, and then converts it into a seesaw biochemical logic circuit through the dual-rail logic circuit, and finally verifies its output through the Visual DSD simulation software. And analyze and judge whether there is a fire. The circuit design of the present invention is effective, and has very high accuracy and sensitivity; Provides a basic theoretical basis for the operation of large-scale intelligent alarm system design, improves the reliability of biological computer logic circuits, and promotes The development of biological computers.

Description

Fire alarm dual-track logic circuit and its realization method based on chain replacement

technical field

The invention relates to the technical field of logic circuits, in particular to a fire alarm dual-track logic circuit based on chain replacement and an implementation method.

Background technique

In the current rapidly developing computer age, traditional logic circuit design can no longer meet the needs of people in normal and safe life. A big problem that our country attaches great importance to, how to judge whether there are hidden dangers in a timely and accurate manner will be the direction of research. DNA computing combining scientific computing and molecular biology disciplines is a new field of research. As a new computing tool, DNA has solved many problems, such as Hamiltonian path and maximum clique problem. DNA self-assembly is an important supporting technology of DNA nanotechnology, which has the characteristics of predictability and programmability, both of which have good development prospects in self-assembly in the application field. DNA strand displacement technology also plays a dynamic role in DNA nanotechnology in the field of biocomputing. Due to its own series of characteristics of spontaneity, sensitivity and accuracy, DNA strand replacement technology has been widely used in nanomachines, molecular logic circuits, nanomedicine and other fields. In recent years, biological computers have been widely concerned by many scientists from different fields, and molecular logic circuits are an important part of biological computers. Therefore, the method of constructing logic circuits plays an important role in biological computers.

DNA computing has handled a large number of molecular operations such as self-assembly, fluorescent labeling, strand displacement, and probe machines. DNA strand replacement technology is developed on the basis of DNA self-assembly technology, so DNA self-assembly technology and DNA strand replacement technology are two important supporting technologies for the study of DNA nanotechnology. Moreover, DNA strand replacement technology is very suitable for building molecular logic circuits. In traditional electronic logic circuits, high and low levels are usually expressed as "true" and "false" of Boolean logic. The cascade reaction based on chain displacement technology has realized the dynamic connection of adjacent logic modules and made it possible for researchers to construct large-scale and complex logic circuits. In addition, with the advantages of high-capacity information accumulation, high-performance parallel computing, programming and simulation, DNA strand replacement technology has been deeply researched in the fields of molecular computing, nanomachines, diagnosis and disease treatment. DNA strand replacement technology is also of great research interest in solving mathematical problems, managing nanomachines, and discussing the course of life. In addition, the construction of biochemical logic circuits based on DNA strand replacement also has important research significance for the mastery of design procedures. Strategies based on DNA strand displacement technology have great application prospects in the fields of smart stimuli-responsive materials, nanoelectronic circuits and devices, biosensors, and nanomedicine.

Contents of the invention

In order to promote the development of biological computers, the present invention proposes a dual-track logic circuit for fire alarm based on DNA strand replacement and its implementation method. First, a digital circuit with dual-track logic for fire alarm is designed, and then the digital logic circuit is used to construct a fire alarm with dual-track logic. Dual-track logic circuit, and finally convert the dual-track logic circuit into a biochemical logic circuit, and use Visual DSD simulation software to analyze the correctness of the fire alarm dual-track logic circuit, which has high sensitivity and reliability.

In order to achieve the above object, the technical solution of the present invention is achieved in this way: a double-track logic circuit for fire alarm based on chain replacement, including four input chains, amplification gates, integrated gates, the first DNA threshold gate, and the second DNA threshold gate and output chains, each of which has two states: _{A 1} , B 1 , C ₁ , and D ₁ for logic-on states, and A ₀ , B ₀ , C ₀ , and D ₀ for logic-off states; The output chain includes two states Y ₁ and Y ₀ respectively; the amplification gate has one input and three outputs, the threshold concentration in the amplification gate is less than 1n mol/L, and the integration gate includes a three-input integration gate with three inputs and one output and A four-input integrated gate with four inputs and one output; the threshold concentration of the first DNA threshold gate is less than 1nmol/L, and the threshold concentration of the second DNA threshold gate is greater than 1; the state of the input chain is A ₁ , B ₁ , C ₁ , D ₁ , A ₀ , B ₀ , C ₀ and D ₀ are respectively connected to an amplification gate as input signals, and the output terminals of the amplification gates are respectively connected to different three-input integrated gates through DNA signals, and four three-input integrated gates The gates are respectively connected to a four-input integrated gate through a first DNA threshold gate, and the four-input integrated gate obtains an output signal Y ₀ through a second DNA threshold gate; the four three-input integrated gates are respectively connected to the other through a second DNA threshold gate. One four-input integration gate is connected, and the other four-input integration gate passes through the first DNA threshold gate to obtain an output signal Y ₁ .

The input chain A ₀ is connected to the amplification gate I, the input chain A ₁ is connected to the amplification gate II, the input chain B ₀ is connected to the amplification gate III, the input chain B ₁ is connected to the amplification gate IV, and the input chain C ₀ It is connected with the amplifier gate V, the input chain _C1 is connected with the amplifier gate VI, the input chain _D0 is connected with the amplifier gate VII, and the input chain _D1 is connected with the amplifier gate VIII; the first output terminal of the amplifier gate I, the amplifier The first output end of the gate III and the first output end of the amplifying gate V are connected with the three-input integrated gate I, the first output end of the amplifying gate II, the first output end of the amplifying gate IV, and the first output end of the amplifying gate VI The output ends are all connected to the three-input integrated gate II, the second output end of the amplifying gate I, the second output end of the amplifying gate III, and the first output end of the amplifying gate VII are all connected to the three-input integrated gate III, and the amplifying gate The second output terminal of II, the second output terminal of amplifier gate IV, and the first output terminal of amplifier gate VIII are connected with the three-input integration gate IV, the third output terminal of amplifier gate I, the second output terminal of amplifier gate V , the second output end of the amplifier gate VII are connected to the three-input integrated gate V, the third output end of the amplifier gate II, the second output end of the amplifier gate VI, and the second output end of the amplifier gate VIII are all three-input integrated gate VI The third output terminal of the amplifier gate III, the third output terminal of the amplifier gate V, and the third output terminal of the amplifier gate VII are connected with the three-input integrated gate VII, the third output terminal of the amplifier gate IV, the third output terminal of the amplifier gate VII The third output terminal of the amplifier gate VIII and the third output terminal of the amplification gate VIII are connected to the three-input integrated gate VIII; finally, the three-input integrated gate I, the three-input integrated gate III, the three-input integrated gate V, and the three-input integrated gate VII respectively pass through A first DNA threshold gate is connected with four-input integration gate II, and four-input integration gate II is connected with a second DNA threshold gate, so as to obtain output signal Y ₀ ; three-input integration gate II, three-input integration gate IV, three-input integration gate II The input integration gate VI is respectively connected to the four-input integration gate I through a second DNA threshold gate, and the four-input integration gate I is connected to a first DNA threshold gate to obtain an output signal Y ₁ .

The initial concentration of fuel in the amplification gate is twice the binding concentration of the output signal; the threshold concentration of the amplification gate is set to 0.2 nmol/L, and the fuel concentration of the amplification gate is set to 6 nmol/L; when the input chain When the concentration is 1.2 nmol/L, the output concentration of the output terminal of the amplification gate is 1 nmol/L; the threshold concentration of the first DNA threshold gate is 0.6 nmol/L, and the threshold concentration of the second DNA threshold gate is 2.4 n mol/L.

The steps of its realization method are:

Step 1: In the DNA strand displacement reaction, it is realized at room temperature without enzymes or transcription mechanisms. The terminal domain of the input strand reacts with part of the signal chain and undergoes branch migration until the single strand in the next double strand is replaced by the external single strand. , and finally form a new single chain as the output chain;

Step 2: Use the basic reaction mechanism of DNA strand replacement to construct a fire alarm system with four types of detection signal input. A digital logic circuit with a dual-track logic circuit whose output signal is Y. The logic operation states in the digital logic circuit are represented by binary values 0 and 1, respectively. ;

Step 3: Each input signal is converted into two opposite input signals A ₀ and A ₁ , B ₀ and B ₁ , C ₀ and C ₁ , D ₀ and D ₁ , and the output signal Y is Y ₀ and Y ₁ two states, using the dual-rail logic idea to transform the digital logic circuit into a dual-rail logic circuit that uses four kinds of detection signal input operations without low-level borrowing, so as to calculate two different according to the designed dual-rail logic circuit Binary number operation to determine whether there is a fire alarm signal;

Step 4: Use the seesaw circuit as the basic component of the molecular logic circuit unit, convert the logic gates in the dual-rail logic circuit into seesaw logic gates with input signal chain, output signal chain, threshold value chain and fuel chain, and obtain the seesaw logic circuit ;

Step 5: Based on the DNA strand replacement reaction, the input signals A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ and D ₁ are respectively used as the input chains of different amplification gates, and phases are added in front of the seesaw logic gates. Matching integrated gates to convert seesaw logic circuits into seesaw biochemical logic circuits.

In the first step, if a new structural domain is generated in the double chain, a reaction similar to the reaction will occur and a dynamic equilibrium will be reached; if no new target domain is generated, the reaction will end.

The digital logic circuit comprises five AND gates, four input signals of A, B, C and D, and an output signal Y; first, the input signals A, B and C carry out an AND operation, and the operation result value is represented by _R1 ; input Signals A, B, and D perform AND operation, and the operation result value is represented by R ₂ ; input signals A, C, and D perform AND operation, and the operation result value is represented by R ₃ ; input signals B, C, and D perform AND operation , the operation result value is represented by R ₄ ; finally, the previous operation output values R ₁ , R ₂ , R ₃ , R ₄ are subjected to the next-level AND operation operation, and the operation result value is represented by Q to obtain the final logic operation output result Y, namely Y=Q={R ₁ ∧ R ₂ ∧ _{R 3} ∧ R ₄ }.

In the input signal, A, B, C and D are the binary number input corresponding to the four input signals of smoke sensor, temperature sensor, light sensor and hand signal device respectively, and Y is the operation calculation of the double-track logic circuit for judging whether there is a fire The output result of is also represented by binary numbers 0 and 1. If the value of the output result Y is 1, there is a fire, otherwise there is no fire.

The dual-rail logic circuit includes five logic AND gates and five logic OR gates, the input signal includes A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ and D ₁ , and the output signal is Y ₀ and Y ₁ ; input signals A ₀ , B ₀ , C ₀ are all connected to logic OR gate K ₁ , input signals A ₁ , B ₁ , C ₁ are all connected to logic AND gate K ₂ , input signals A ₀ , B ₀ and D ₀ are connected with logic OR gate K ₃ , input signals A ₁ , B ₁ , D ₁ are connected with logic AND gate K ₄ , input signals A ₀ , C ₀ , D ₀ are all connected with logic OR gate K _5- phase connection, input signals A ₁ , C ₁ , D ₁ are all connected to logic AND gate K ₆ , input signals B ₀ , C ₀ and D ₀ are all connected to logic OR gate K ₇ , input signals B ₁ , C Both ₁ and _D1 are connected to the logical AND gate _K8 ; the output results of the logical OR gates _K1 , _K3 , _K5 , and _K7 are all connected to the logical four-input signal AND gate _K9 to obtain the output signal _Y0 ; The output results of the logical OR gates K ₂ , K ₄ , K ₆ , and K ₈ are all connected to the logical OR gate K ₁₀ of four input signals to obtain the output signal Y ₁ .

Beneficial effects of the present invention: the digital logic circuit of the fire alarm system with four kinds of detection signal input is constructed based on the chain replacement, and the operation operation of the digital logic circuit is converted into the dual-rail logic circuit of the fire alarm system with four kinds of detection signal input by using the dual-track logic idea , and then transformed into a seesaw biochemical logic circuit through a dual-track logic circuit, and finally verified its output results through Visual DSD simulation software, and analyzed and judged whether there was a fire when the four detection signals were randomly input according to the simulation results. The simulation results show that the dual-rail logic circuit of the fire alarm system that realizes the input of four kinds of detection signals is effective, and has high accuracy, sensitivity and reliability. The invention provides a basic theoretical basis for future design of more complex and large-scale logic circuit operations, improves the reliability of the logic circuit of the biological computer, and promotes the development of the biological computer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the number of digital logic circuits of the fire alarm system based on chain replacement in the present invention.

Fig. 2 is the dual-rail logic circuit of the fire alarm system based on chain replacement in the present invention.

Fig. 3 is an abstract diagram of the transformation of the seesaw logic gate of the present invention.

Fig. 4 is the seesaw biochemical logic circuit of the chain replacement-based fire alarm system of the present invention.

Fig. 5 is a simulation diagram of the output result of the Visual DSD Software of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The steps of a method for implementing a fire alarm dual-track logic circuit based on chain replacement are as follows:

Step 1: The DNA strand displacement reaction is realized at room temperature without enzymes or transcription mechanisms, reacts the terminal domain of the input strand with part of the signal chain, and performs branch migration until the next single strand in the double strand is replaced by the external single strand Instead, a new single chain is finally formed as the output chain.

DNA self-assembly technology is more and more widely used in bioengineering logic circuits, and DNA strand replacement technology is derived from DNA self-assembly technology. Due to the complementary pairing rules of the basic double helix structure, multiple DNA single strands are spontaneously and orderly assembled in multiple dimensions. . Based on the reaction mechanism of DNA strand replacement, a new logic circuit is designed, including fire alarm logic circuit with four input signals of smoke sensor, temperature sensor, light sensor and hand alarm device. Corresponding to the input and output logic relationship of DNA strand replacement, the Four detection signals are used as input terminals, and the output terminals are used to indicate whether there is a fire situation. The design idea of this reaction mechanism circuit based on DNA strand replacement is applied to the design of specific life circuits. Its accuracy and high sensitivity have good application value, and can ensure the safety of people's lives in a timely and accurate manner.

Step 2: Use the basic reaction mechanism of DNA strand replacement to construct a fire alarm system with four types of detection signal input. A digital logic circuit with a dual-track logic circuit whose output signal is Y. The logic operation states in the digital logic circuit are represented by binary values 0 and 1, respectively. .

In digital logic circuits, logic operation states are represented by 0 and 1, respectively. The logical OR gate evaluates to 0 if both input states have a value of 0, and 1 otherwise. A logical OR gate evaluates to 1 if both input states have a value of 1, otherwise it is 0. Two different binary numbers are calculated by the dual-rail logic circuit of the operation operation of the fire alarm system using the four detection signal inputs without a low level borrow. Depending on the input signal, the output signal may be the same. Among these input signals, A, B, C, and D are the inputs of the four detection signals of smoke, temperature, light, and alarm devices corresponding to the digital logic circuit of the fire alarm system, and Y is the four detection signals based on DNA strand replacement. The output result of the digital logic circuit of the fire alarm system input by the detection signal, if the output result value is 1, there is a fire, otherwise there is no fire. That is, the digital logic circuit has the effect of judging whether there is a fire.

As shown in Figure 1, the digital logic circuit includes four AND logic gates with three inputs and one AND logic gate with four input signals, the four input signals are A, B, C and D, and one output signal is Y; first Input signals A, B, C perform AND operation, and the operation result is represented by _R1 ; then input signals A, B, D perform AND operation, and the operation output value is represented by _R2 ; input signals A, C, D are ANDed The operation operation, the operation result is represented by R ₃ ; then the input signal B, C and D are AND operation operation, and the output result value is represented by R ₄ ; finally, the output result value of the previous AND operation is R ₁ , R ₂ , R ₃ and R ₄ perform an AND operation to obtain the final logic operation output, namely Y={R ₁ and R ₂ and R ₃ and R ₄ }.

Step 3: Each input signal is converted into two opposite input signals A ₀ and A ₁ , B ₀ and B ₁ , C ₀ and C ₁ , D ₀ and D ₁ , and the output signal Y is Y ₀ and Y ₁ two states, use the dual-rail logic idea to transform the digital logic circuit into a dual-rail logic circuit that uses four kinds of detection signal input operations without low-level borrowing, so as to perform dual-rail logic circuit operation operations, according to the output binary The results of several simulations are used to determine whether there is a fire.

In the dual-track logic circuit for the operation and operation of the fire alarm system based on the four types of detection signals input by DNA strand replacement, the design and implementation of the dual-track logic circuit for the operation and operation of the fire alarm system with four types of detection signal input by DNA strand replacement is designed using the dual-track method The double-layer logic circuit and the double-track logic algorithm can avoid wrong output signals, and can obtain definite operation results when the input signals do not exist completely. Combined with the digital circuit diagram to build a dual-rail logic circuit, as shown in Figure 2. In dual-rail logic circuits, to ensure that all cases of input signals can be identified, each raw input signal can be converted into two input signals, each of which can be represented as a logical "on" or "off" state . If the input signal A cannot participate in the reaction, the states of A ₁ and A ₀ are shown as logic "on" and logic "off" respectively in the dual-rail logic circuit. In addition, the logic functions of the AND gate and the OR gate in the dual-rail logic circuit should be realized by a pair of "AND" logic gate and "OR" logic gate. According to the input signal of different state, the state of the output signal is also different. The output result of the output signal Y has two cases in total, that is, the output operation results are Y ₁ and Y ₁ ⁰ . The specific reaction process is: the input signal A ₀ , B ₀ , C ₀ , D ₀ , A ₁ , B ₁ , C ₁ , D ₁ passes through the four AND gates K ₂ , K ₄ , K ₆ , K ₈ and K ₁ The four OR gates of , K ₃ , K ₅ , and K ₇ carry out logical operations, the output results of the four AND gates are represented by Q ₂ , Q ₄ , Q ₆ , and Q ₈ , and the output results of the four OR gates are represented by Q ₁ , Q ₃ , Q ₅ , and Q ₇ represent, and then output results Q ₁ , Q ₃ , Q ₅ , and Q ₇ and perform an AND operation through an AND gate K ₉ , and finally obtain an output result Y ₀ . The output results K ₂ , K ₄ , K ₆ , and K ₈ are ORed through the OR gate K ₁₀ to finally obtain the output result Y ₁ .

As shown in Figure 2, the dual-rail logic circuit includes five logic AND gates and five logic OR gates, the input signals include A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ and D ₁ , and the output The signals are Y ₀ and Y ₁ ; according to the order of the double-track logic circuit from top to bottom and from left to right, the input signals A ₀ , B ₀ , and C ₀ are all connected to the logical OR gate K ₁ , and the input signals A ₁ , B _1. C ₁ is connected with logic AND gate K ₂ , input signals A ₀ , B ₀ , D ₀ are connected with logic OR gate K ₃ , input signals A ₁ , B ₁ , D ₁ are all connected with logic AND gate K _4- phase connection, input signals A ₀ , C ₀ , D ₀ are all connected to logic OR gate K ₅ , input signals A ₁ , C ₁ , D ₁ are all connected to logic AND gate K ₆ , input signals B ₀ , C Both ₀ and D ₀ are connected to the logical OR gate K ₇ , and the input signals B ₁ , C ₁ and D ₁ are all connected to the logical AND gate K ₈ ; the output result Q ₁ of the logical OR gate K ₁ and the logical OR gate K ₃ The output result Q ₃ of the logic OR gate K ₅ , the output result Q ₅ of the logic OR gate K ₇ , and the output result Q ₇ of the logic OR gate K 7 are all connected with the AND gate K ₉ of the logic four-input signal to obtain the output signal Y ₀ ; the logic OR gate The output result Q ₂ of K ₂ , the output result Q ₄ of the logical OR gate K ₄ , the output result Q ₆ of the logical OR gate K ₆ and the output result Q ₈ of the logical OR gate K ₈ are all combined with the logical OR gate K of four input signals ₁₀ are connected to get the output signal Y ₁ .

Example description:

1) When ABCD is 0101, namely A ₀ =1, B ₁ =1, C ₀ =1, D ₁ =1, A 1 =0, B ₀ =0, _{C 1 =} 0, D ₀ =0, A ₀ =1, B ₀ =0, C ₀ =1, through the first logical OR gate K ₁ to carry out OR operation, the output result is represented by Q ₁ , that is, Q ₁ =[(A ₀ =1)∨(B ₀ =0 )∨(C ₀ =1)]=1, A ₁ =0, B ₁ =1, C ₁ =0 and operation through the first logical AND gate K ₂ , and the output result is represented by Q ₂ , that is, Q ₂ = [(A ₁ =0)∧(B ₁ =1)∧(C ₁ =0)]=0, A ₀ =1, B ₀ =0, D ₀ =0 are ORed through the second logical OR gate K ₃ Operation, the output result is represented by Q ₃ , that is, Q ₃ =[(A ₀ =1)∨(B ₀ =0)∨(D ₀ =0)]=1; A ₁ =0, B ₁ =1, D ₁ =1 and operation through the second logical AND gate K ₄ , the output result is represented by Q ₄ , that is, Q ₄ =[(A ₁ =0)∧(B ₁ =1)∧(D ₁ =1)]=0 ; A ₀ =1, C ₀ =1, D ₀ =0 are ORed through the third logical OR gate K ₅ , and the output result is represented by Q ₅ , that is, Q ₅ =[(A ₀ =1)∨(C ₀ =1)∨(D ₀ =0)]=1; A ₁ =0, C ₁ =0, D ₁ =1 are ANDed through the third logical AND gate K ₆ , and the output result is represented by Q ₆ , that is, Q ₆ =[(A ₁ =0)∧(C ₁ =0)∧(D ₁ =1)]=0; B ₀ =0, C ₀ =1, D ₀ =0 through the fourth logic OR gate K ₇ Perform an OR operation, and the output result is represented by Q ₇ , that is, Q ₇ =[(B ₀ =0)∨(C ₀ =1)∨(D ₀ =0)]=1; B ₁ =1, C ₁ =0, D ₁ =1 performs an AND operation through the fourth logic AND gate K ₈ , and the output result is represented by Q ₈ , that is, Q ₈ =[(B ₁ =1)∧(C ₁ =0)∧(D ₁ =1)] =0. Then the output results Q ₁ , Q ₃ , Q ₅ and Q ₇ are carried out to the next level logic AND gate K ₉ for AND operation, and the output result is represented by Q ₉ , that is, Q ₉ =[(Q ₁ =1)∧(Q ₃ =1)∧(Q ₅ =1)∧(Q ₇ =1)]=1, so the final output Y ₀ =1. Then the output results Q ₂ , Q ₄ , Q ₆ and Q ₈ are carried out to the next logical OR gate K ₁₀ for OR operation, and the output result is represented by Q ₁₀ , that is, Q ₁₀ =[(P ₂ =0)∨(P ₄ =0)∨(P ₆ =0)∨(P ₈ =0)]=0, so the final output result Y ₁ =0. It can be seen from the Y value of the result that the probability of fire occurrence in the fire alarm system input by the four kinds of detection signals is relatively low.

2) When ABCD is 1101, namely A ₁ =1, B ₁ =1, C ₀ =1, D ₁ =1, A ₀ =0, B ₀ =0, C ₁ =0, D ₀ =0, A ₀ =0, B ₀ =0, C ₀ =1, through the first gate logic OR gate K ₁ to perform OR operation, the output result is represented by Q ₁ , that is, Q ₁ =[(A ₀ =0)∨(B ₀ = 0)∨(C ₀ =1)]=1; A ₁ =1, B ₁ =1, C ₁ =0 and the second gate logic AND gate K ₂ , and the output result is represented by Q ₂ , that is, Q ₂ =[(A ₁ =1)∧(B ₁ =1)∧(C ₁ =0)]=0; A ₀ =0, B ₀ =0, D ₀ =0 through the third logic OR gate K ₃ Carry out the OR operation, and the output result is represented by Q ₃ , that is, Q ₃ =[(A ₀ =0)∨(B ₀ =0)∨(D ₀ =0)]=0; A ₁ =1, B ₁ =1 , D ₁ =1 and operation through the fourth gate logic AND gate K ₄ , and the output result is represented by Q ₄ , that is, Q ₄ =[(A ₁ =1)∧(B ₁ =1)∧(D ₁ =1 )]=1; A ₀ =0, C ₀ =1, D ₀ =0 are ORed through the fifth gate logic OR gate K ₅ , and the output result is represented by Q ₅ , that is, Q ₅ =[(A ₀ =0 )∨(C ₀ =1)∨(D ₀ =0)]=1; A ₁ =1, C ₁ =0, D ₁ =1 perform AND operation through the sixth gate logic AND gate K ₆ , and output the result with Q ₆ means that Q ₆ =[(A ₁ =1)∧(C ₁ =0)∧(D ₁ =1)]=0; B ₀ =0, C ₀ =1, D ₀ =0 after the seventh A logical OR gate K ₇ performs an OR operation, and the output result is represented by Q ₇ , that is, Q ₇ =[(B ₀ =0)∨(C ₀ =1)∨(D ₀ =0)]=1; B ₁ = 1. C ₁ =0, D ₁ =1 and operation through the eighth gate logic AND gate K ₈ , and the output result is represented by Q ₈ , that is, Q ₈ =[(B ₁ =1)∧(C ₁ =0) ∧(D ₁ =1)]=0. Then the output results Q ₁ , Q ₃ , Q ₅ and Q ₇ are carried out to the next level logic AND gate K ₉ for AND operation, and the output result is represented by Q ₉ , that is, Q ₉ =[(Q ₁ =1)∧(Q ₃ =0)∧(Q ₅ =1)∧(Q ₇ =1)]=0, so the final output Y ₀ =0. Then the output results Q ₂ , Q ₄ , Q ₆ and Q ₈ are carried out to the next logical OR gate K ₁₀ for OR operation, and the output result is represented by Q ₁₀ , that is, Q ₁₀ =[(P ₂ =0)∨(P ₄ =1)∨(P ₆ =0)∨(P ₈ =0)]=1, so the final output result Y ₁ =1. It can be seen from the Y value of the result that the probability of fire occurrence in the fire alarm system input by the four kinds of detection signals is relatively high.

(3) When ABCD is 0010, namely A ₀ =1, B ₀ =1, C ₁ =1, D ₀ =1, A ₁ =0, B ₁ =0, C ₀ =0, D ₁ =0, A ₀ =1, B ₀ =1, C ₀ =0 are ORed through the first logical OR gate K ₁ , and the output result is represented by Q ₁ , that is, Q ₁ =[(A ₀ =1)∨(B ₀ =1)∨(C ₀ =0)]=1; A ₁ =0, B ₁ =0, C ₁ =1 are ANDed by the second gate logic AND gate K ₂ , and the output result is represented by Q ₂ , that is Q ₂ =[(A ₁ =0)∧(B ₁ =0)∧(C ₁ =1)]=0; A ₀ =1, B ₀ =1, D ₀ =1 through the third logic OR gate K ₃ performs an OR operation, and the output result is represented by Q ₃ , that is, Q ₃ =[(A ₀ =1)∨(B ₀ =1)∨(D ₀ =1)]=1; A ₁ =0, B ₁ = 0. D ₁ =0 performs an AND operation through the fourth gate logic AND gate K ₄ , and the output result is represented by Q ₄ , that is, Q ₄ =[(A ₁ =0)∧(B ₁ =0)∧(D ₁ = 0)]=0; A ₀ =1, C ₀ =0, D ₀ =1 are ORed through the fifth gate logic OR gate K ₅ , and the output result is represented by Q ₅ , that is, Q ₅ =[(A ₀ = 1) ∨ (C ₀ =0) ∨ (D ₀ =1)] = 1; A ₁ = 0, C ₁ = 1, D ₁ = 0 and the sixth gate logic AND gate K ₆ , and output the result Expressed by Q ₆ , that is, Q ₆ =[(A ₁ =0)∧(C ₁ =1)∧(D ₁ =0)]=0; B ₀ =1, C ₀ =0, D ₀ =1 after the first The seven gate logic OR gate K ₇ performs OR operation, and the output result is represented by Q ₇ , that is, Q ₇ =[(B ₀ =1)∨(C ₀ =0)∨(D ₀ =1)]=1; B ₁ =0, C ₁ =1, D ₁ =0 and operation through the eighth gate logic AND gate K ₈ , and the output result is represented by Q ₈ , that is, Q ₈ =[(B ₁ =0)∧(C ₁ =1 )∧(D ₁ =0)]=0. Then the output results Q ₁ , Q ₃ , Q ₅ and Q ₇ are carried out to the next level logic AND gate K ₉ for AND operation, and the output result is represented by Q ₉ , that is, Q ₉ =[(Q ₁ =1)∧(Q ₃ =1)∧(Q ₅ =1)∧(Q ₇ =1)]=1, so the final output Y ₀ =1. Then Q ₂ , Q ₄ , Q ₆ and Q ₈ perform an OR operation on the next logical OR gate K ₁₀ , and the output result is represented by Q ₁₀ , that is, Q ₁₀ =[(P ₂ =0)∨(P ₄ = 0)∨(P ₆ =0)∨(P ₈ =0)]=0, so the final output result Y ₁ =0. It can be seen from the Y value of the result that the probability of fire occurrence in the fire alarm system input by the four kinds of detection signals is relatively low.

(4) When ABCD is 0111, namely A ₀ =1, B ₁ =1, C ₁ =1, D ₁ =1, A ₁ =0, B ₀ =0, C ₀ =0, D ₀ =0, A ₀ =1, B ₀ =0, C ₀ =0 are ORed through the first gate logic OR gate K ₁ , and the output result is represented by Q ₁ , that is, Q ₁ =[(A ₀ =1)∨(B ₀ =0)∨(C ₀ =0)]=0; A ₁ =0, B ₁ =1, C ₁ =1 are ANDed through the second gate logic AND gate K ₂ , and the output result is represented by Q ₂ , that is Q ₂ =[(A ₁ =0)∧(B ₁ =1)∧(C ₁ =1)]=0; A ₀ =1, B ₀ =0, D ₀ =0 through the third logic OR gate K ₃ performs an OR operation, and the output result is represented by Q ₃ , that is, Q ₃ =[(A ₀ =1)∨(B ₀ =0)∨(D ₀ =0)]=1; A ₁ =0, B ₁ = 1. D ₁ =1 performs an AND operation through the fourth gate logic AND gate K ₄ , and the output result is represented by Q ₄ , that is, Q ₄ =[(A ₁ =0)∧(B ₁ =1)∧(D ₁ = 1)]=0; A ₀ =1, C ₀ =0, D ₀ =0 conduct an OR operation through the fifth gate logic OR gate K ₅ , and the output result is represented by Q ₅ , that is, Q ₅ =[(A ₀ = 1) ∨ (C ₀ =0) ∨ (D ₀ =0)] = 1; A ₁ = 0, C ₁ = 1, D ₁ = 1 perform AND operation through the sixth gate logic AND gate K ₆ , and output the result Expressed by Q ₆ , that is, Q ₆ =[(A ₁ =0)∧(C ₁ =1)∧(D ₁ =1)]=0; B ₀ =0, C ₀ =0, D ₀ =0 after the first The seven logic gates K ₇ perform an OR operation, and the output result is represented by Q ₇ , that is, Q ₇ =[(B ₀ =0)∨(C ₀ =0)∨(D ₀ =0)]=0; B ₁ =1, C ₁ =1, D ₁ =1 and operation through the eighth gate logic AND gate K ₈ , and the output result is represented by Q ₈ , that is, Q ₈ =[(B ₁ =1)∧(C ₁ =1 )∧(D ₁ =1)]=1. Then the output results Q ₁ , Q ₃ , Q ₅ and Q ₇ are carried out to the next level logic AND gate K ₉ for AND operation, and the output result is represented by Q ₉ , that is, Q ₉ =[(Q ₁ =1)∧(Q ₃ =1)∧(Q ₅ =1)∧(Q ₇ =0)]=0, so the final output Y ₀ =0. Then the output results Q ₂ , Q ₄ , Q ₆ and Q ₈ are carried out to the next logical OR gate K ₁₀ for OR operation, and the output result is represented by Q ₁₀ , that is, Q ₁₀ =[(P ₂ =0)∨(P ₄ =0)∨(P ₆ =0)∨(P ₈ =1)]=1, so the final output result Y ₁ =1. It can be seen from the Y value of the result that the probability of fire occurrence in the fire alarm system input by the four kinds of detection signals is relatively high.

Step 4: Use the seesaw circuit as the basic component of the molecular logic circuit unit, convert the logic gates in the dual-rail logic circuit into seesaw logic gates with input signal chain, output signal chain, threshold value chain and fuel chain, and obtain the seesaw logic circuit .

The seesaw circuit is adopted as the basic component of the molecular logic circuit unit, which consists of six DNA strands: input strand, output strand, threshold value strand, fuel strand, logic gate strand and strand displacement strand. As shown in Figure 3, the seesaw logic gate is jointly transformed from an input signal chain, an output signal chain, a threshold value chain and a fuel chain. Numbers in black indicate identification of nodes or interfaces of some nodes in strand permutation, and numbers within nodes or on lines indicate relative concentrations of different initial DNA species. Each species plays a specific role within the phylum (e.g., input signal) and has a unique name within the strand permutation (e.g., w2,5). The gray line represents the DNA strand, the arrow marks its 3' end, and the dark and light colors represent different DNA sequences. S2, S5, and S6 are chain-length (15 nucleotides) recognition domains corresponding to nodes 2, 5, and 6; S7 does not interact with other nodes in strand displacement, but maintains signal chain consistency. T is the short (5-nucleotide) pivot domain; T* is the Watson-Crick complement of T, etc.; S2* is the nucleotide at the 3' end.

In order to describe the expression of the biochemical circuit more vividly, two circular nodes respectively represent each DNA logic gate, and each line is used to represent each DNA signal respectively. Dual-rail logic circuits should be converted to see-saw logic circuits and are in the first stage of reaction. It is converted into a seesaw logic circuit. In order to see the relationship between different logic gates more clearly, different lines represent different logic gate operations in the entire seesaw logic circuit diagram.

Step 5: Based on the DNA strand replacement reaction, the input signals A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ and D ₁ are respectively used as the input chains of different amplification gates, and phases are added in front of the seesaw logic gates. Matched integrated gates to convert seesaw logic circuits into seesaw biochemical logic circuits.

As shown in Figure 4, a dual-rail logic circuit for fire alarm based on DNA strand replacement, including input chains A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ and D ₁ , and input chains Matched amplification gate, integration gate, first DNA threshold gate, second DNA threshold gate and output strand. Each input chain A, B, C, D has two states, the state of logic open is A ₁ , B ₁ , C ₁ and D ₁ , and the state of logic off is A ₀ , B ₀ , C ₀ and D ₀ ; the output chain includes two states respectively Y ₀ and Y ₁ ; the amplification gate has one input and three outputs, a threshold is set in the amplification gate and there are multiple fuel outputs, and the threshold concentration of the amplification gate is less than 1 nmol/ L. If the total concentration of the input signal is greater than the threshold concentration, then the output signal concentration is 1nmol/L, otherwise the output concentration is 0nmol/L. The integrated gate includes a three-input integrated gate with three inputs and one output and a four-input integrated gate with four inputs and one output, and finally through the expression relationship between the first DNA threshold gate and the second DNA threshold gate, the output result values Y ₁ and Y ₀ . The threshold concentration of the first DNA threshold gate is less than 1 nmol/L, and the threshold concentration of the second DNA threshold gate is greater than 1 nmol/L. The states A ₀ , A ₁ , B ₀ , B ₁ , C ₀ , C ₁ , D ₀ , and D ₁ of the input chains A, B, C, and D are respectively connected to the amplification gate as input signals, and the output of the amplification gate is The terminals are respectively connected to different three-input integrated gates through DNA signals, and the four three-input integrated gates are respectively connected to a four-input integrated gate through a first DNA threshold gate, and the four-input integrated gate is output through the second DNA threshold gate Signal Y ₀ ; the four three-input integration gates are respectively connected to one four-input integration gate through a second DNA threshold gate, and the four-input integration gate obtains an output signal Y ₁ through the first DNA threshold gate.

Amplifying gates are used to take one input signal and react to integrate three output signals. If the total concentration of the input signal in the amplification gate is greater than the threshold concentration, the output signal can be obtained, otherwise the output concentration is 0 nmol/L. In order to promote the complete release of the output signal, the initial concentration of the fuel is twice the binding concentration of the output signal. The threshold concentration of the amplification gate is 0.2nmol/L, and the fuel concentration of the amplification gate is 6nmol/L; when the signal of the input chain is 1, the output concentration of the output terminal of the amplification gate is 1nmol/L. The function of the integration gate with three signals of input 1, input 2 and input 3 is opposite to that of the amplification gate. The integration gate is used to receive multiple input signals and integrate them into one output signal after reaction. In the seesaw biochemical logic circuit, this process can perform AND and OR logic operations through threshold gates. The function of the threshold gate can adjust the input signal through the amplitude adjustment of the concentration. An output signal can be generated if the total concentration of the input signal is greater than a threshold concentration, otherwise the output concentration is 0 nmol/L. In the present invention, in order to promote the complete release of the output signal, according to the theoretical design requirements of the experiment, the threshold concentration of the first DNA threshold gate is 0.6 nmol/L, and the threshold concentration of the second DNA threshold gate is 2.4 nmol/L. Since the output signal concentration of the integrated gate is 1 nmol/L, the function of the first DNA threshold gate is logic OR, and the role of the second DNA threshold gate is logic AND.

Preferably, the amplifying gates include amplifying gate I, amplifying gate II, amplifying gate III, amplifying gate IV, amplifying gate V, amplifying gate VI, amplifying gate VII and amplifying gate VIII, and each amplifying gate includes an input terminal and three output. Four-input integrated gates include four-input integrated gate I and four-input integrated gate II. Three-input integrated gates include three-input integrated gate I, three-input integrated gate II, three-input integrated gate III, three-input integrated gate IV, three-input integrated gate V, three-input integrated gate VI, three-input integrated gate VII and three-input integrated Gate VIII. The input chain A ₀ is connected with the amplification gate Ⅰ, the input chain A ₁ is connected with the amplification gate Ⅱ, the input chain B ₀ is connected with the amplification gate Ⅲ, the input chain B ₁ is connected with the amplification gate Ⅳ, the input chain C ₀ is connected with the amplification gate The gate V is connected, the input chain _C1 is connected with the amplification gate VI, the input chain _D0 is connected with the amplification gate VII, the input chain _D1 is connected with the amplification gate VIII; the first output terminal of the amplification gate I, the amplification gate III The first output end of the amplifying gate V and the first output end of the amplifying gate V are connected to the three-input integrated gate I, the first output end of the amplifying gate II, the first output end of the amplifying gate IV, and the first output end of the amplifying gate VI They are all connected to the three-input integrated gate II, the second output end of the amplifying gate I, the second output end of the amplifying gate III, and the first output end of the amplifying gate VII are all connected to the three-input integrated gate III, and the amplifying gate II’s The second output terminal, the second output terminal of the amplifier gate IV, and the first output terminal of the amplifier gate VIII are connected to the three-input integrated gate IV, the third output terminal of the amplifier gate I, the second output terminal of the amplifier gate V, and the amplifier The second output terminal of the gate VII is connected with the three-input integration gate V, and the third output terminal of the amplification gate II, the second output terminal of the amplification gate VI, and the second output terminal of the amplification gate VIII are connected with the three-input integration gate VI , the third output terminal of the amplifier gate III, the third output terminal of the amplifier gate V, and the third output terminal of the amplifier gate VII are connected with the three-input integration gate VII, the third output terminal of the amplifier gate IV, the third output terminal of the amplifier gate VI The three output terminals and the third output terminal of the amplification gate VIII are connected to the three-input integrated gate VIII. Finally, the three-input integrated gate I, the three-input integrated gate III, the three-input integrated gate V, and the three-input integrated gate VII are respectively connected to the four-input integrated gate II through a first DNA threshold gate, and the four-input integrated gate II is connected to a first The two DNA threshold gates are connected to obtain the output signal Y ₀ ; the three-input integrated gate II, the three-input integrated gate IV, the three-input integrated gate VI and the three-input integrated gate VIII respectively pass through a second DNA threshold gate and a four-input integrated gate I is connected, and the four-input integration gate I is connected with a first DNA threshold gate to obtain an output signal Y ₁ .

The logic function of the seesaw biochemical logic circuit is the same as that of the dual-rail logic circuit. When the input chain signal is 1, the output signals can be obtained from the three output terminals of the amplifying gate. When the input terminal of the four-input integrated gate is 4 nmol/L, it means There is a biochemical reaction, and the output signal is 1. The input of the first DNA threshold gate is 3 nmol/L to obtain the output signal, and the reaction continues. The concentration of each input end of the second DNA threshold gate is 1nmol/L, the output concentration is 0nmol/L, and the reaction is terminated.

The present invention uses the double-track idea to convert the digital logic circuit of the fire alarm system input by the four kinds of detection signals replaced by the DNA chain into a dual-track logic circuit, and then converts the dual-track logic circuit into a seesaw biochemical logic circuit, and finally obtains two kinds of results of the output signal Y ₀ and Y ₁ , and use the Visual DSD simulation software to verify, as shown in Figure 5, the verification results meet the judgment requirements of fire occurrence, and can be applied to analyze and judge whether there is a fire. Therefore, the dual-track logic circuit design of the fire alarm system based on the four inputs of the smoke sensor, temperature sensor, light sensor and hand alarm device in the present invention is effective and has high accuracy and sensitivity.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (8)

1. a kind of fire alarm double rail logic circuit based on strand displacement, which is characterized in that including four input chains, amplification door, Integrated door, the first DNA threshold values door, the 2nd DNA threshold values door and output chain, each chain that inputs have two states：Represent logic The state opened is A₁、B₁、C₁And D₁, represent that the state that logic is closed is A₀、B₀、C₀And D₀；It is respectively Y that chain, which is exported, including two states₁ And Y₀；Amplify door tool there are one input and three outputs, the threshold concentration amplified in door is less than 1n mol/L, integrates door and includes three The integrated door of four inputs of one output of the integrated door of three inputs and four inputs of a one output of input；First DNA threshold value doors Threshold concentration is less than 1n mol/L, and the threshold concentration of the 2nd DNA threshold value doors is more than 1n mol/L；The state A of the input chain₁、 B₁、C₁、D₁、A₀、B₀、C₀And D₀It is connected respectively with an amplification door as input signal, the output terminal for amplifying door passes through respectively DNA signals are connected from the different integrated doors of three inputs, the integrated door of four three inputs respectively by a first DNA threshold values door with The integrated door of one four input is connected, and the integrated door of four inputs obtains output signal Y by the 2nd DNA threshold value doors₀；Four three inputs Integrated door is connected respectively by a 2nd DNA threshold values door with another integrated door of four inputs, another integrated door of four inputs Output signal Y is obtained by the first DNA threshold value doors₁。

2. the fire alarm double rail logic circuit according to claim 1 based on strand displacement, which is characterized in that the input Chain A₀It is connected with amplification door I, input chain A₁It is connected with amplification door II, input chain B₀It is connected with amplification door III, input chain B₁ It is connected with amplification door IV, input chain C₀It is connected with amplification door V, input chain C₁It is connected with amplification door VI, input chain D₀With Amplification door VII is connected, input chain D₁It is connected with amplification door VIII；Amplify the first output terminal of door I, amplify the first defeated of door III Outlet, the first output terminal for amplifying door V are connected with the three integrated doors I of input, amplify the first output terminal, the amplification door of door II IV the first output terminal, the first output terminal of amplification door VI are connected with the integrated door II of three inputs, the second output of amplification door I It holds, the first output terminal of the second output terminal of amplification door III, amplification door VII is connected with the integrated door III of three inputs, amplification door II Second output terminal, the second output terminal for amplifying door IV, the integrated door IV of equal three input of the first output terminal that amplifies door VIII be connected, The third output terminal for amplifying door I, the second output terminal for amplifying door V, the equal integrated door V of three inputs of second output terminal for amplifying door VII It is connected, the third output terminal for amplifying door II, the second output terminal for amplifying door VI, equal three input of second output terminal for amplifying door VIII Integrated door VI is connected, the third output terminal for amplifying door III, the third output terminal for amplifying door V, the third output terminal for amplifying door VII The integrated door VII of equal three input is connected, the third output terminal for amplifying door IV, the third output terminal for amplifying door VI, amplification door VIII the The equal integrated door VIII of three inputs of three output terminals is connected；Finally, the integrated integrated door of the input of door III, three of the integrated input of door I, three of three inputs Vth, the integrated door VII of three inputs is connected respectively by an integrated door II of the first DNA threshold values Men Yusi inputs, the integrated door of four inputs II is connected with a 2nd DNA threshold value door, so as to obtain output signal Y₀；The integrated door IV of the integrated input of door II, three of three inputs, The three integrated doors VI of input are connected respectively by an integrated door I of the 2nd DNA threshold values Men Yusi inputs, the integrated door I of four inputs with One the first DNA threshold value door is connected, so as to obtain output signal Y₁。

3. the fire alarm double rail logic circuit according to claim 1 based on strand displacement, which is characterized in that the amplification The initial concentration of fuel is bound twice of concentration for output signal in door；The threshold concentration of amplification door is set as 0.2 n mol/L, The fuel concentration of amplification door is set as 6 n mol/L；As a concentration of 1.2 n mol/L for inputting chain, amplify the output terminal of door A concentration of 1 n mol/L of output；The threshold concentration of the first DNA threshold value doors be 0.6 n mol/L, the 2nd DNA threshold value doors Threshold concentration be 2.4 n mol/L.

4. the fire alarm double rail logic circuit according to claim 1 or 2 based on strand displacement, which is characterized in that in fact Now the step of method is：

Step 1：Do not have to realize under enzyme or the room temperature of transcription mechanism in DNA chain displacement reaction, will input the terminal domains of chain with Part signal chain reaction simultaneously carries out branch migration, until the single-stranded single-stranded substitution by the external world in double-strand next time, ultimately forms New is single-stranded for output chain；

Step 2：The fire alarm system that four kinds of detectable signal inputs are built using the reaction mechanism of basic DNA chain displacement is double Rail logic circuit output signal is the Digital Logical Circuits of Y, and the logical operation state in Digital Logical Circuits uses binary system respectively Numerical value 0 and 1 represents；

Step 3：Each input signal is converted into the opposite input signal A of two states₀And A₁、B₀And B₁、C₀And C₁、D₀With D₁, output signal Y, which exports operation result, Y₀And Y₁Digital Logical Circuits is converted by two states using double rail logic thought The double rail logic circuit of four kinds of detectable signals input operation borrowed using no low level, so as to according to designed pair Rail logic circuit calculates two different binary number operations, it is determined whether has fire alarm signal generation；

Step 4：It, will be in double rail logic circuit using element of the seesaw circuit as molecular logic circuit unit Logic gate be converted into the seesaw logic gate for having input signal chain, output signal chain, threshold value chain and fuel chain, obtain lifting up Plate logic circuit；

Step 5：It is reacted based on DNA chain displacement by input signal A₀、A₁、B₀、B₁、C₀、C₁、D₀And D₁Respectively as different amplification doors Input chain, increase the integrated door to match before seesaw logic gate, by seesaw logic circuit be converted into seesaw biochemistry Logic electricity.

5. the fire alarm double rail logic circuit according to claim 4 based on strand displacement, which is characterized in that the step If generating new structural domain in double-strand in one, the reaction similar with reacting occurs, and be up to dynamic equilibrium；If no New aiming field is generated, then reaction terminates.

6. the fire alarm double rail logic circuit according to claim 4 based on strand displacement, which is characterized in that the number Logic circuit includes five and tetra- door, A, B, C and D input signals, an output signal Y；Input signal A, B and C first into Row and arithmetic operation, operation result value R₁It represents；Input signal A, B and D are carried out and arithmetic operation, operation result value R₂Table Show；Input signal A, C and D are carried out and arithmetic operation, operation result value R₃It represents；Input signal B, C and D grasped with operation Make, operation result value R₄It represents；Finally by preceding operation output valve R₁、R₂、R₃、R₄Carry out again next stage and arithmetic operation, fortune It calculates end value to be represented with Q, obtains final logical operation output result Y, i.e. Y=Q={ R₁ ∧R₂ ∧ R₃ ∧ R₄ }。

7. the fire alarm double rail logic circuit according to claim 6 based on strand displacement, which is characterized in that believe in input In number, A, B, C and D are that cigarette sense, warming, light sensation and the corresponding binary number input of four kinds of input signals of hand reporting device, Y are respectively The output of the operation of the double rail logic circuit of fire generation is judged whether there is as a result, also being represented with binary number 0 and 1, it is defeated The value for going out result Y has fire if 1, does not otherwise have fire.

8. the fire alarm double rail logic circuit according to claim 4 based on strand displacement, which is characterized in that the double track Logic circuit includes five logical AND gates and five logic sum gates, and input signal includes A₀、A₁、B₀、B₁、C₀、C₁、D₀And D₁, output Signal is Y₀And Y₁；Input signal A₀、B₀、C₀With logic sum gate K₁It is connected, input signal A₁、B₁、C₁With logical AND gate K₂ It is connected, input signal A₀、B₀、D₀With logic sum gate K₃It is connected, input signal A₁、B₁、D₁With logical AND gate K₄It is connected It connects, input signal A₀、C₀、D₀With logic sum gate K₅It is connected, input signal A₁、C₁、D₁With logical AND gate K₆It is connected, it is defeated Enter signal B₀、C₀And D₀With logic sum gate K₇It is connected, input signal B₁、C₁And D₁With logical AND gate K₈It is connected；Logic or Door K₁、K₃、K₅、K₇Output result with four input signal of logic and door K₉It is connected, obtains output signal Y₀；Logic sum gate K₂、K₄、K₆、K₈Output result with the logic sum gate K of four input signals₁₀It is connected, obtains output signal Y₁。