CN110708699B - Temperature sensor system capable of preventing data tampering - Google Patents
Temperature sensor system capable of preventing data tampering Download PDFInfo
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- CN110708699B CN110708699B CN201910977262.6A CN201910977262A CN110708699B CN 110708699 B CN110708699 B CN 110708699B CN 201910977262 A CN201910977262 A CN 201910977262A CN 110708699 B CN110708699 B CN 110708699B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/12—Detection or prevention of fraud
- H04W12/121—Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
- H04L63/1441—Countermeasures against malicious traffic
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Abstract
The invention provides a temperature sensor system capable of preventing data tampering, which consists of 1 acquisition controller and at least 1 intelligent temperature probe, wherein the acquisition controller comprises a central processing unit, a wireless communication module and at least 1 group of temperature probe wiring terminals, the central processing unit is provided with at least 2 groups of serial buses, the central processing unit is connected with the wireless communication module through 1 group of serial buses, and the central processing unit is connected with the temperature probe wiring terminals through the other 1 group of serial buses.
Description
Technical Field
The invention belongs to the technical field of intelligent sensors, and particularly relates to a temperature sensor system capable of preventing data tampering.
Background
In the fields of medical treatment, food and pharmaceutical production lines and some fields related to safe production, strict process control is often required, temperature monitoring of a plurality of parts is involved, the temperature data are required to be strictly controlled, data are required to be prevented from being tampered, accuracy of the temperature data is ensured, and a temperature recorder capable of recording a temperature curve in paper is generally adopted, so that a monitored person is required to store the paper record in a system for investigation. However, the temperature acquisition of the temperature recorder depends on various types of sensors, the data recording depends on a paper temperature recording curve, a falsifier can adopt various methods to generate deceptive data, for example, a temperature probe of the temperature monitor is replaced, and another probe capable of arbitrarily setting temperature is used for reporting false data; destroying the original paper temperature record curve and printing false paper records. In some cases, after the inspection and acceptance of the installation of the device, a falsifier changes the temperature probe to another area privately, or installs a new sensor probe for the reason of power failure or device failure, and changes the monitoring area so that the monitoring part is separated from effective monitoring.
The temperature monitor and the temperature probe are additionally provided with tin seals, and the use of printing paper is monitored, so that a certain tamper-proof effect can be obtained, but because the external interface of the temperature monitor is a standard pt100 sensor, the printer is taken as a mechanical part working for a long time and is detachable, and thus the tamper behavior of a user cannot be completely stopped, the invention provides a tamper-proof temperature sensor system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a temperature sensor system for preventing data tampering, which is reasonable in design, and is greatly improved aiming at the weak links of the traditional temperature recorder, a paper printer is replaced by wireless communication, temperature monitoring data is reported to the Internet or a monitoring private network in real time, and the possibility that paper records are tampered is avoided.
In order to achieve the above object, the present invention is realized by the following technical scheme: the temperature sensor system for preventing data tampering comprises 1 acquisition controller and at least 1 intelligent temperature probe, the acquisition controller comprises a central processing unit, a wireless communication module and at least 1 group of temperature probe wiring terminals, the central processing unit is provided with at least 2 groups of serial buses, the central processing unit is connected with the wireless communication module through 1 group of serial buses, the central processing unit is connected with the temperature probe wiring terminals through 1 group of serial buses, the intelligent temperature probe comprises a singlechip, a gravity acceleration sensor, at least 1 temperature probe and at least 1 micro switch, at least 2 groups of serial buses, at least 1 temperature sampling interface and at least 1 or more universal input port lines are arranged on the singlechip, the singlechip is connected with the gravity acceleration sensor through 1 group of serial buses, the singlechip is connected with a temperature probe wiring terminal of the acquisition controller through another 1 group of serial buses, the singlechip is connected with the temperature probe through a temperature sampling interface and is connected with the micro switch through a general input interface, the micro switch is extruded by the shell in a normal state and is in a closed state, when the shell is opened, the micro switch is released to be in an open state, the singlechip of the intelligent temperature probe detects the open state of the micro switch, namely, the temperature information is stopped being sampled through the temperature sampling interface, and simultaneously alarms to the acquisition controller through the serial buses, the singlechip of the intelligent temperature probe detects that the gravity acceleration component value or the total value of the gravity acceleration component value of any dimension output by the gravity acceleration sensor is changed by more than 0.001 m/square second, namely, the temperature information is stopped being sampled through the temperature sampling interface, meanwhile, alarming is carried out on the acquisition controller through the serial bus, encryption password exchange is carried out between the singlechip of the intelligent temperature probe and the central processing unit of the acquisition controller through the serial bus, once password exchange cannot be recovered within at least 50 milliseconds after interruption, the singlechip of the intelligent temperature probe immediately stops sampling temperature information through the temperature sampling interface, simultaneously, alarming is carried out on the acquisition controller through the serial bus, the acquired temperature information is transmitted to the Internet or a monitoring private network in real time through the wireless communication module by the acquisition controller, and a backup battery is arranged in the intelligent temperature probe.
As a preferred embodiment of the invention, the acquisition controller relies on external power supply and simultaneously supplies power to the intelligent temperature probe through the temperature probe connecting terminal, the acquisition controller can monitor the external power supply state, and when external power supply is abnormal, the acquisition controller can rely on the internal backup battery to continuously work for at least 100 milliseconds, and the abnormal state is recorded and reported to the internet or a monitoring private network.
When the singlechip of the intelligent temperature probe detects the disconnection state of the micro switch or detects the change of any dimension component value of the gravity acceleration or the total value thereof to be more than 0.001 m/square seconds, the information can be recorded, and the abnormal information which is detected once is reported to the acquisition controller after the power supply and the serial communication are recovered.
As a preferred implementation mode of the invention, the key used by the encryption password of the intelligent temperature probe and the acquisition controller is related to the sequence code of the intelligent temperature probe or a corresponding relation is generated through a function, and the temperature and state information reported by the intelligent temperature probe are encrypted through the key.
As a preferred implementation mode of the invention, the wireless communication module adopts 4G wireless communication, has higher communication rate, can transmit real-time temperature monitoring value, the central processing unit adopts an industrial processor chip with the model STM32F407, has stronger operation capability, can realize more complex networking protocol and encryption password algorithm, has 6 serial interfaces, is convenient for expanding the intelligent sensor interface, the wireless communication module acquires 4V power supply through BUCK type BUCK DC/DC, the central processing unit acquires 3.3V power supply through BUCK type BUCK DC/DC, the power supply port stores a small amount of energy through diodes D1 and C1, the 24V power supply simultaneously supplies power to the intelligent temperature probe, when the 24V power supply falls, the comparator U1 generates a power supply alarm signal, and can continuously work for at least 100 milliseconds by means of the energy stored by the capacitor C1, and the central processing unit can report abnormal information of the power supply to the Internet or monitor private network in the period of time.
The invention has the beneficial effects that: the invention relates to a temperature sensor system capable of preventing data tampering, which comprises an acquisition controller, an intelligent temperature probe, a central processing unit, a wireless communication module, a temperature probe wiring terminal, a singlechip, a gravity acceleration sensor, a temperature probe and a micro switch.
The temperature sensor system capable of preventing data tampering is greatly improved aiming at the weak links of the traditional temperature recorder, a paper printer is replaced by wireless communication, temperature monitoring data are reported to the Internet or a monitoring private network in real time, the possibility that paper records are tampered is avoided, a pt100 type universal temperature probe is replaced by an intelligent temperature probe, the intelligent temperature probe has the computing capacity and the invasion or tamper detection capacity of a gravity acceleration sensor, a microswitch and the like, communication is carried out between the intelligent temperature probe and an acquisition controller by adopting an encryption password, the possibility of data fake through the outstretched temperature probe can be avoided, the intention of the micro switch and the acceleration sensor after power failure is detected, the intention of the private reconstruction sensor system after power failure is attempted is deterred, and the acquired data of the temperature sensor system can be comprehensively prevented from being tampered through the means.
Drawings
FIG. 1 is a schematic diagram of an overall arrangement of a temperature sensor system that is resistant to data tampering;
FIG. 2 is a schematic diagram of an acquisition controller circuit of a temperature sensor system that is resistant to data tampering;
FIG. 3 is a schematic diagram of an intelligent temperature probe circuit of a temperature sensor system that is resistant to data tampering;
in the figure: 1-acquisition controller, 2-intelligent temperature probe, 3-central processing unit, 4-wireless communication module, 5-temperature probe binding post, 6-singlechip, 7-gravity acceleration sensor, 8-temperature probe, 9-micro-gap switch.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1 to 3, the present invention provides a technical solution: the temperature sensor system capable of preventing data tampering comprises 1 acquisition controller 1 and at least 1 intelligent temperature probe 2, the acquisition controller 1 comprises a central processing unit 3, a wireless communication module 4 and at least 1 group of temperature probe wiring terminals 5, the central processing unit 3 is provided with at least 2 groups of serial buses, the central processing unit 3 is connected with the wireless communication module 4 through 1 group of serial buses, the central processing unit 3 is connected with the temperature probe wiring terminals 5 through the other 1 group of serial buses, the intelligent temperature probe 2 comprises a singlechip 6, a gravity acceleration sensor 7, at least 1 temperature probe 8 and at least 1 micro-switch 9, at least 2 groups of serial buses, at least 1 temperature sampling interface and at least 1 universal input port line are arranged on the singlechip 6, the singlechip 6 is connected with the gravity acceleration sensor 7 through the 1 group of serial buses, the singlechip 6 is connected with the temperature probe wiring terminals 5 of the acquisition controller 1 through the other 1 group of serial buses, the singlechip 6 is connected with the temperature probe wiring terminals 5 through the other 1 group of serial buses, the singlechip 6 is connected with the temperature probe 9 through the universal input port through the universal sampling interface, the micro-switch is in a normal state when the singlechip is in a state of being disconnected from the temperature probe 9 through the sampling interface, the temperature probe is in a normal state, when the temperature probe is in a state of being disconnected from the intelligent temperature probe is in a normal state through the temperature probe control interface, the temperature probe is in a state, and when the temperature probe is in a normal state, the temperature state is released, and the temperature signal is in a state, and the temperature state is detected, and the temperature signal is detected, and the temperature is in a normal state, and the temperature state is detected, the singlechip 6 of the intelligent temperature probe 2 detects that the gravity acceleration component value or the total value of the gravity acceleration component value of any dimension output by the gravity acceleration sensor 7 changes by more than 0.001 m/square second, namely, the sampling of temperature information through a temperature sampling interface is stopped, meanwhile, the alarm is given to the acquisition controller 1 through a serial bus, the singlechip 6 of the intelligent temperature probe 2 and the central processing unit 3 of the acquisition controller 1 exchange encryption passwords through the serial bus, once the password exchange is interrupted, the recovery cannot be carried out within at least 50 milliseconds, the singlechip 6 of the intelligent temperature probe 2 immediately stops sampling the temperature information through the temperature sampling interface, meanwhile, the alarm is given to the acquisition controller 1 through the serial bus, the acquired temperature information is transmitted to the Internet or a monitoring private network in real time through the wireless communication module 4, and a backup battery is arranged in the intelligent temperature probe 2.
As a preferred embodiment of the present invention, the acquisition controller 1 relies on external power supply, and simultaneously supplies power to the intelligent temperature probe 2 through the temperature probe connection terminal 5, the acquisition controller 1 can monitor the external power supply state, and when external power supply is abnormal, the acquisition controller can rely on the internal backup battery to continuously work for at least 100 milliseconds, and record and report the abnormal state to the internet or a monitoring private network.
As a preferred embodiment of the present invention, when the power supply from the temperature probe connection terminal 5 is abnormal, the backup battery can be relied on to work continuously for at least 100 ms, the abnormal state is recorded and reported to the acquisition controller 1, then the acquisition controller is switched to the low power consumption standby state and is kept in the low power consumption standby state for at least more than 24 hours, the states of the micro switch 9 and the gravity acceleration sensor 7 are continuously monitored, and when the singlechip 6 of the intelligent temperature probe 2 detects the disconnection state of the micro switch 9 or detects the change of the arbitrary dimension component value of the gravity acceleration or the total value thereof for more than 0.001 m/square second, the information is recorded, and the detected abnormal information is reported to the acquisition controller 1 after the power supply and the serial communication are recovered.
As a preferred embodiment of the present invention, the key used by the encryption password of the intelligent temperature probe 2 and the acquisition controller 1 is related to the serial code of the intelligent temperature probe 2 or a function is used to generate a corresponding relation, and the temperature and state information reported by the intelligent temperature probe 2 are encrypted by the key.
As a preferred implementation mode of the invention, the wireless communication module 4 adopts 4G wireless communication, has higher communication rate, can transmit real-time temperature monitoring value, the central processing unit 3 adopts an industrial processor chip with the model of STM32F407, has stronger operation capability, can realize more complex networking protocol and encryption password algorithm, has 6 serial interfaces, is convenient for expanding the intelligent sensor interface, the wireless communication module 4 acquires 4V power supply through BUCK type BUCK DC/DC, the central processing unit 3 acquires 3.3V power supply through BUCK type BUCK DC/DC, the power supply port stores a small amount of energy through diodes D1 and C1, the 24V power supply simultaneously supplies power to the intelligent temperature probe 2, the comparator U1 generates a power supply alarm signal depending on the energy stored by the capacitor C1, the central processing unit 3 can continuously work for at least 100 milliseconds, and can report abnormal information of the power supply to the Internet or a monitoring private network in the period of time.
Working principle: the micro switch 9 is extruded by the shell under the normal state and is in a closed state, if someone tries to disassemble the intelligent temperature probe 2, the micro switch 9 is released and becomes in an open state, the gravity acceleration sensor 7 is SPI interface, the change of three dimensions of gravity acceleration is monitored, for the intelligent temperature probe 2 in place, the gravity acceleration components of the three dimensions should be fixed, or very weak deviation exists along with the vibration of monitored equipment, and when someone tries to move the intelligent temperature probe 2 and changes the sampling position, the gravity acceleration value must change more remarkably in the components of the three dimensions; when someone tries to power off, the intelligent temperature probe 2 continuously monitors the change of the micro switch 9 and the gravity acceleration by means of the built-in battery, prevents the attempt of changing the sampling position of the temperature probe 8 or opening the intelligent temperature probe 2 under the condition of power off, releases the power off state when the shell is opened, the singlechip 6 of the intelligent temperature probe 2 detects the power off state of the micro switch 9, namely, stops sampling temperature information through a temperature sampling interface, simultaneously alarms to the acquisition controller 1 through a serial bus, the singlechip 6 of the intelligent temperature probe 2 detects the change of the gravity acceleration component value or the total value of any dimension output by the gravity acceleration sensor 7, namely, stops sampling temperature information through the temperature sampling interface, simultaneously alarms to the acquisition controller 1 through the serial bus, the single chip 6 of the intelligent temperature probe 2 and the central processing unit 3 of the acquisition controller 1 exchange encrypted passwords through a serial bus, once the passwords cannot be recovered within at least 50 milliseconds after the password exchange is interrupted, the single chip 6 of the intelligent temperature probe 2 immediately stops sampling temperature information through a temperature sampling interface, alarms the acquisition controller 1 through the serial bus, the acquisition controller 1 transmits the acquired temperature information to the Internet or a monitoring private network in real time through a wireless communication module 4, the acquisition controller 1 supplies power to the intelligent temperature probe 2 through a temperature probe connecting terminal 5 at the same time, the acquisition controller 1 can monitor the external power supply state, can continuously work for at least 100 milliseconds through an internal backup battery when the external power supply is abnormal, records and reports the abnormal state to the Internet or the monitoring private network when the power supply from the temperature probe connecting terminal 5 is abnormal, the intelligent temperature probe can continuously work by means of a backup battery for at least 100 milliseconds, the abnormal state is recorded and reported to the acquisition controller 1, then the acquisition controller is switched to a low-power standby state and continuously monitors states of the micro switch 9 and the gravity acceleration sensor 7 for at least more than 24 hours in the low-power standby state, when the singlechip 6 of the intelligent temperature probe 2 detects the disconnection state of the micro switch 9 or detects the change of any dimension component value of the gravity acceleration or the total value of the gravity acceleration for more than 0.001 meters/square seconds, the abnormal state is recorded, the abnormal information detected once is reported to the acquisition controller 1 after power supply and serial communication recovery, the wireless communication module 4 adopts 4G wireless communication, the real-time temperature monitoring value can be transmitted, the central processor 3 adopts an industrial processor chip with the model STM32F407, the relatively high operation capacity is realized, relatively complex networking protocol and an encryption algorithm are realized, the intelligent temperature probe is provided with 6 serial interfaces, the intelligent sensor interfaces are convenient to expand, the wireless communication module 4 acquires 4V power supply through BUCK type step-down DC/DC, the CPU 3C 3 is used for acquiring the abnormal information detected once, the abnormal information is reported to the acquisition controller 1, the abnormal information can be stored in the power supply network through the special power supply channel of the DC 3C 3/DC 1, the power supply channel, the abnormal state is stored in the power supply channel 1, and the power supply channel is at least 2D 3D, the time is used for storing the abnormal information, and the abnormal information can be stored in the power supply channel 1, and the power supply channel is stored by the power supply 1, and the power supply channel is at least 1.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (2)
1. The temperature sensor system capable of preventing data tampering is characterized in that the temperature sensor system capable of preventing data tampering is composed of 1 acquisition controller (1) and at least 1 intelligent temperature probe (2), the acquisition controller (1) comprises a central processing unit (3), a wireless communication module (4) and at least 1 group of temperature probe wiring terminals (5), the central processing unit (3) is provided with at least 2 groups of serial buses, the central processing unit (3) is connected with the wireless communication module (4) through 1 group of serial buses, the central processing unit (3) is connected with the temperature probe wiring terminals (5) through 1 group of serial buses, the intelligent temperature probe (2) comprises a single chip microcomputer (6), a gravity acceleration sensor (7), at least 1 temperature probe (8) and at least 1 micro switch (9), at least 2 groups of serial buses, at least 1 temperature sampling interface and at least 1 universal input interface are arranged on the single chip microcomputer (6), the single chip microcomputer (6) is connected with the temperature probe wiring terminals (5) through 1 group of serial buses, the single chip microcomputer (6) is connected with the temperature probe wiring terminals (6) through the control sampling interface (8), and the single chip microcomputer (6) is connected with the temperature probe wiring terminals (1) through the universal input interface (6), the micro switch (9) is extruded by the shell under the normal state and is in a closed state, when the shell is opened, the shell is released to be in an open state, the singlechip (6) of the intelligent temperature probe (2) detects the open state of the micro switch (9) and stops sampling temperature information through a temperature sampling interface, meanwhile, the alarm can not be given to the acquisition controller (1) through a serial bus, the singlechip (6) of the intelligent temperature probe (2) detects the temperature information through the temperature interface after the temperature information is exchanged for at least 50 milliseconds, the singlechip (6) of the intelligent temperature probe (2) immediately stops sampling temperature information through the temperature sampling interface or changes of the total value of the gravity acceleration component value by more than 0.001 meters per square second, namely, stops sampling temperature information through the temperature sampling interface, simultaneously, alarms are given to the acquisition controller (1) through the serial bus, the singlechip (6) of the intelligent temperature probe (2) and the central processing unit (3) of the acquisition controller (1) are in an alarm mode, the alarm password is exchanged through the serial bus once the alarm password is not recovered within the time of at least 50 milliseconds after the exchange is interrupted, the singlechip (6) of the intelligent temperature probe (2) stops sampling temperature information through the serial bus, the alarm is sent to the acquisition controller (1) through the wireless communication network or the acquisition controller after the wireless communication is carried out to the acquisition controller (1), meanwhile, the temperature probe wiring terminal (5) is used for supplying power to the intelligent temperature probe (2), the acquisition controller (1) can monitor the external power supply state, when the external power supply is abnormal, the internal backup battery can be used for continuously working for at least 100 milliseconds, the abnormal state is recorded and reported to the Internet or a monitoring private network, when the power supply from the temperature probe wiring terminal (5) is abnormal, the backup battery can be used for continuously working for at least 100 milliseconds, the abnormal state is recorded and reported to the acquisition controller (1), then the acquisition controller is switched to a low-power consumption standby state and continuously works for at least more than 24 hours in the low-power consumption standby state, and the states of the micro switch (9) and the gravity acceleration sensor (7) are continuously monitored, and when the singlechip (6) of the intelligent temperature probe (2) detects the disconnection state of the micro switch (9) or detects the change of any dimension component value of the gravity acceleration or the total value thereof, the change of the collected component value of the gravity acceleration component value or the total value thereof is more than 0.001 meters per square second, the information is recorded, and the detected abnormal information is reported to the acquisition controller (1) after the serial communication is recovered.
2. A temperature sensor system for protection against data manipulation according to claim 1, wherein: the key used by the encryption password of the intelligent temperature probe (2) and the acquisition controller (1) is related to the sequence code of the intelligent temperature probe (2) or a corresponding relation is generated through a function, and the temperature and state information reported by the intelligent temperature probe (2) are encrypted through the key.
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| CN102512174A (en) * | 2011-11-21 | 2012-06-27 | 中国人民解放军第四军医大学 | Portable type physical ability consumption and physiological parameter monitoring instrument |
| CN102792240A (en) * | 2009-11-16 | 2012-11-21 | Nrg系统股份有限公司 | Data acquisition system for condition-based maintenance |
| WO2014111920A1 (en) * | 2013-01-17 | 2014-07-24 | Sure Erasure Ltd. | System and method for monitoring of an electro-mechanical device |
| CN104656602A (en) * | 2013-11-22 | 2015-05-27 | 生禾禾科技实业有限公司 | cloud monitoring device |
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| US20120185636A1 (en) * | 2010-08-04 | 2012-07-19 | Isc8, Inc. | Tamper-Resistant Memory Device With Variable Data Transmission Rate |
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| CN102792240A (en) * | 2009-11-16 | 2012-11-21 | Nrg系统股份有限公司 | Data acquisition system for condition-based maintenance |
| CN102512174A (en) * | 2011-11-21 | 2012-06-27 | 中国人民解放军第四军医大学 | Portable type physical ability consumption and physiological parameter monitoring instrument |
| WO2014111920A1 (en) * | 2013-01-17 | 2014-07-24 | Sure Erasure Ltd. | System and method for monitoring of an electro-mechanical device |
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