KR100766983B1 - Estimation method on 24-hour personal magnetic field exposure by living environments of korean - Google Patents

Abstract

A method for estimating a personal exposed magnetic field for 24 hours by living environments of Koreans is provided to improve the development of an electromagnetic field mechanic research and investigation field by providing a solution for an electromagnetic wave health problem. A method for estimating a personal exposed magnetic field for 24 hours by living environments of Koreans includes the steps of: making a database of measured data for an examinee; applying a revolution calculation method using a genetic algorithm and a genetic programming in an optimized personal magnetic field exposed quantity estimation formula based on the database of the measured data for the examinee; and estimating a personal magnetic field exposed quantity by living environments based on the applied revolution calculation method through a formula 4 as follows: MFExposure=k1log(S) + k2log(A) + k3log(H) + k4log(HS) + K5log(o) + k6log(TL) + Rule.

Description

Estimation method on 24-hour personal magnetic field exposure by living environments of Korean}

1 is a view schematically showing a wire cord technique for a conventional magnetic field strength investigation.

FIG. 2 is a view showing a 24-hour personal exposure magnetic field estimation pattern by the method for estimating individual exposure magnetic fields for each living environment according to the present invention. FIG.

Figure 3 is a view showing a workplace type personal exposure magnetic field estimation pattern by the method of estimating individual exposure field for each living environment according to the present invention.

4 is a view showing a bedroom-type personal exposure magnetic field estimation pattern by the method of estimating individual exposure field for each living environment according to the present invention.

The present invention relates to a method of estimating the individual exposure field of Koreans by their living environment, and in particular, by providing an exposure level (exposure amount) in consideration of all the magnetic field sources that an individual can encounter in daily life, it is more accurate, practical, and easier for non-experts. The present invention relates to a method for estimating the 24-hour personal exposure field of Koreans by their living environment, which can be utilized in a practical manner, and the individual's 24-hour average exposure field can be grasped with specific values.

Electricity is useful as a driving force in all fields such as industries, but on the other hand, home appliances, office equipment, and industrial facilities around our daily lives, especially extremely low-frequency electromagnetic fields (ELF EMFs) generated from high-voltage, high-current power facilities such as transmission and distribution lines and substations. Electric and Magnetic Fields are closely related to the daily lives of individual citizens, and as a result, the concern about the health effects and the harmful effects of the human body is increasing, which is becoming a social problem. The impact on the health of the ultra-low frequency electromagnetic field has become a global concern as well as a very small issue in Korea as a result of epidemiological research reports that the incidence of cancer such as pediatric leukemia and brain cancer in children living near high-voltage transmission lines has increased. In addition, the Korean government recognizes the seriousness of this and adds the self-regulatory standard to Article 119 (Prevention of Induced Obstacles) in February 2004 by the Ministry of Commerce, Industry and Energy (2004-19, 2004.2.17). Reached.

Therefore, it is very important to understand the magnitude of the magnetic field intensity in the daily living environment, which is reported to correlate with the health problems, especially the dynamics of the surroundings, at least thousands to tens of thousands of patients and controls. For the epidemiological investigation of the subject's health effects, it is practically impossible to apply the magnetic measuring instrument to all subjects for more than 24 hours. Therefore, there is a demand for a precise estimating technique that can be accurately predicted without measurement.

As one technique related to the above-described magnetic field strength investigation, there is a wire code (wiring configuration) technique. 1 schematically illustrates such a wire cord technique.

Referring to FIG. 1, first, the power line size of the irradiation area is classified into wire class 1 to 6 (working line) according to the shape of the telegraph pole, and based on this, the distance to the nearest power line from the corresponding irradiation house is measured. By wire coding. Coarse wires send more current than thin wires, and the magnetic field is proportional to the current. In addition, the shape of the telephone pole differs depending on the thickness of the wire. This allows the investigator to classify the wire into six wire classes that have the shape of a telegraph pole that makes it easy to distinguish the size of the power line in the field. Based on these six wire classes, the distance from the house under investigation to the nearest adjacent power line is drawn to create a wire code, a categorized classification. Early wire codes were written in only two categories, high and low, but in later studies very high current configuration (VHCC), ordinary high current configuration (OHCC), ordinary low current configuration (OLCC), and VLCC (very low current configuration) and UG (underground), the categories are subdivided into underground lines.

However, the above wire cord technique suggests relative risk indices for the magnetic fields around power lines (transmission and distribution lines) and underground transmission cables. In other words, the wire cord is an indirect exposure indicator in the field exposure evaluation, and it is mainly used when it is difficult to evaluate such as the past magnetic field exposure by the power line. It is an indirect indicator that classifies the cases of self-exposure and classifies the cases of each case by arranging the size of exposure in the order of scientific common sense in each situation.

Therefore, wire codes do not show strong predictability in the field strength investigation, but tend to relatively well distinguish the strengths of the high and low magnetic fields in the dwelling within a given geographic area. For example, studies of pediatric leukemia in the electromagnetic field have shown that the relative risk for relatively exposed residential areas ranges from approximately 1.5 to 3.0.

The present invention was created in view of the above matters, and is a method of estimating the exposure level (exposure amount) of an individual in consideration of all the sources of magnetic fields encountered in daily life, and is more accurate and practical than conventional methods, and is a non-expert The purpose of this study is to provide a method for estimating the 24-hour personal exposure field for each Korean's living environment, which can be easily utilized, and can grasp the 24-hour average exposure magnetic field of each individual Korean in specific values.

In order to achieve the above object, a 24-hour personal exposure field estimation method for Koreans according to the present invention according to the present invention,

a) constructing an investigator's actual measurement database for use in deriving a field exposure estimate;

b) applying an evolutionary algorithm to which genetic algorithm and genetic programming are applied in optimizing the field exposure estimate based on the constructed survey database; And

에 의해 추정하고, 여기서, MFExposure는 상기 생활환경별로 개인 자계 노출량이고, k1, k2, k3, k4, k5, 및 k6은 상기 생활환경별로 개인 자계 노출량의 추정 대상인 피조사자에 따라 다른 값을 갖는 변수이고, S는 상기 피조사자의 성으로서 남성은 10, 여성은 20이 입력되고, A는 상기 피조사자의 나이로서, 실제 나이를 입력하고, H는 상기 피조사자가 거주하는 가옥의 종류로서 아파트는 10, 기타는 20이 입력되고, HS는 상기 피조사자가 거주하는주택 크기로서 실제 평수가 입력되고, O는 상기 피조사자의 직업으로 회사원은 10, 전업주부는 20, 겸업주부는 30, 초중고학생는 40, 요식업계는 50, 공장근로자는 60, 백화점 및 대형마트는 70, 병원종사자는 80, 전철운전원은 90이 각각 입력되고, TL은 선로 이격거리로서, - 15m 이내, TL = 10, - 15∼49m, TL = 25, - 50m 이상, TL = 50로 각각 입력되고, 상기 Rule은 피조사자 생활 세부 규칙으로서 PC, 전기장판, 전기용접기, 특수 의료기기의 사용 여부와 사용 시간에 의해 값이 결정되는 변수인 것을 특징으로 한다.c) Equation 4 below, which is the general form of the objective function in applying the genetic algorithm to the individual magnetic field exposure amount according to the living environment based on the applied evolutionary computation method
[Equation 4]

MFExposure is an individual magnetic field exposure amount for each living environment, and k1, k2, k3, k4, k5, and k6 are variables having different values according to an investigator who is an estimation target of the individual magnetic field exposure amount for each living environment. , S is the sex of the investigator, male is 10, female is 20, A is the age of the examinee, the actual age is entered, H is the type of house where the subject resides, the apartment is 10, and the other is 20 is inputted, HS is the size of the house where the examinee resides, and the actual number of square meters is entered. , 60 for factory workers, 70 for department stores and large marts, 80 for hospital workers, 90 for train drivers, TL is the distance between tracks, within -15m, TL = 10, -15-49m, TL = 25 ,-Over 50m, each with TL = 50 Input is, the Rule is characterized in that a variable which is a value by the presence and operation time of the PC, electric blanket, electric welding machines, special medical device as informant life detailed rules determined.

Hereinafter, embodiments of the present invention will be described in detail.

(Example)

According to the 24-hour personal exposure magnetic field estimation method for Koreans according to the present invention, first, a survey data base for investigating a field exposure estimation equation is constructed.

In other words, the survey database to be used for the development of estimating equations corresponding to the main body of the self-exposure method was constructed as shown in Table 1 for 444 general people over 8 years of age.

When the database is constructed in this way, the most suitable numerical solution is applied in optimizing the magnetic exposure estimate based on the constructed database. In the present invention, the evolutionary computation method is selected as the most suitable numerical solution for problem optimization, and in particular, the genetic algorithm (GA) and the genetic programming (GP) are applied. Evolutionary computation is a stochastic optimization algorithm that models the natural phenomena of genetic inheritance and survival competition in the form of algorithms.

Tuning parameters of the two methods when tuning the database by the evolutionary algorithm are shown in Table 2 below, and the general form of the objective function in the application of the genetic algorithm is determined as shown in Equation 4 below.

At this time, the convergence target value was set to about 0.3 mG of absolute mean mean estimation error, that is, the tuning and verification error rates were 30% or less, respectively.

In addition, other development conditions are as follows.

1) Kinds and features of dependent variables

Main Variables: Sex (S), Age (A; Age), House (H; House), House Size (HS; Home Size), O (Occupation), and Transmission Line (TL) ) And six.

-Auxiliary variables: To improve the accuracy of estimation, we added a supplementary variable 'RULE' which is determined by the use time and usage time of PC, electric blanket, electric welding machine and special medical equipment.

-Ignore the weak factors: Sleep time, school stay time, and TV watching did not significantly affect the 24-hour personal field exposure and were not taken into account when developing the estimation formula.

2) Adoption of the line separation distance (TL): The distance between the transmission and distribution line and the residential area does not use the lateral distance (LD), but adopts the actual distance (RD). A digital laser rangefinder was used for distance measurement.

3) Reason for not adopting load current or line voltage as variable: The electrical factor that determines the magnitude of the magnetic field of transmission and distribution line is the load current, but the load current fluctuates severely by day and season, so it is difficult to adopt it as a representative variable. The line voltage was not used as a variable because it could not be accurately identified due to the inexperience of the subjects.

4) Even though the condition of each variable of the investigator is normal, there are cases where negative calculations occur due to the unusual problem between the composition of the variables in the formula, and this problem is penalized for the suitability of the corresponding string (chromosome, individual) during the DB tuning process. I solved it by imposing penalty.

5) Signs of variables: The signs of HS and TL must be-respectively.

6) HS: For houses and villas, enter the number of floors on which the examinee resides.

7) If multiple variables exist in the argument of Log, it is not taken because it lowers the discriminating power of estimation.

8) In each case, the final equation was selected to be excellent in terms of estimation error and shape (taken all possible variables) by tuning both GA and GP.

As a result, when the numerical solution is applied, the individual magnetic field exposure amount is estimated for each living environment based on the applied numerical solution.

In other words, the estimation method of calculating the average 24-hour individual exposure field of Koreans by living environment is as follows.

(1) Types of estimation formulas: There are three types of estimation formulas: one general 24-hour exposure estimation formula, one magnetic exposure estimation at work, and one magnetic exposure estimation formula in the bedroom. Apply the formula according to.

(2) Individual characteristics and living variables include sex (S; sex), age (A; age), house (H; house), house size (HS; home size), occupation (O; occupation) and track. It is defined as a total of seven variables such as TL (Transmission Line), and RULE which is determined by the use time and the use time of PC, electric plate, electric welding machine and special medical equipment.

(3) How to estimate individual magnetic field exposure by living environment

A) Estimation of 24-hour field exposure of Koreans by "24-hour formula": Check all the values of six variables such as gender and age of the examinee and the detailed rule of the subject's life (RULE) in Table 3 below. Use Equation 1 and input the number corresponding to the code of the main variable according to the following table. However, the valid conditions for each variable must be checked when applying six variable values.

(B) Estimation of Korean self-exposure at work by “working”: H, HS, and TL are not relevant for estimating personal self-exposure at work, such as gender (S), age (A) and occupation (O). Only three variable values are required, and the details of the examinee's life rules (RULE) in Table 3 are checked, and the following equation is used in Equation 2 below, and the numerical value corresponding to the code of the main variable is input according to Table 4 above. do. However, the valid conditions of each variable must be checked when applying three variable values.

C) Estimation of Korean self-exposure in bedroom by "bedroom": Since the occupational variable (O) has no correlation in estimating the individual self-exposure in bedroom, five variables except occupational variables are required. Check the detailed rule of the examinee's life (RULE), and the application equation uses the following Equation 3, and enter the numerical value corresponding to the code of the main variable according to Table 4. However, when 5 variable values are applied, the valid conditions for each variable must be checked.

(4) Other technical matters

-"RULE", an auxiliary variable of the dependent variable, is an auxiliary variable that is determined by the use time and use time of PC, electric blanket, electric welding machine and special medical equipment for the purpose of improving the accuracy of estimation.

-Sleep time, school stay, and TV watching are not considered to have a significant effect on 24-hour personal magnetic field exposure and are ignored as weak factors.

-The distance (TL) between the transmission line and the residential area does not use the lateral distance (LD), but adopts the radial distance (RD), which is the actual distance.It is recommended to use a digital laser rangefinder for the actual distance measurement. do.

-The electrical factor that determines the magnitude of the magnetic field of the transmission and distribution line is the load current, but since the load current fluctuates by day and season, it is difficult to adopt it as a representative variable, so the separation distance between the transmission and distribution line closest to the residence is applied.

-The number of floors (HS) of houses is the floor space for apartments, the floor space for single-family homes and villas.

The following are examples of actually estimating the degree of personal exposure field for each living environment according to the method for estimating individual exposure field for each living environment according to the present invention.

(Estimation Example-1)

Table 5 below is a sample of the subject's input data of Prediction Example-1.

-Table 5 shows the result of calculating the size of the 24-hour average exposure magnetic field of Koreans under general living conditions using Equation 1, which is the “24-hour formula”, and the degree of the estimated error between the actual values. .

-According to Table 5, it is possible to easily estimate an individual's 24-hour living magnetic field by using a total of 7 individual characteristics of life including RULE.

-In addition, the estimated error expressed by the absolute mean value of 18 subjects was 0.27mG, which is excellent.

2 shows a personal exposure magnetic field estimation pattern of estimation example-1 according to the estimation method of the present invention.

(Estimation Example-2)

Table 6 shows sample of the subject's input data of estimation example-2.

-Table 6 shows the degree of estimation error between the results of calculating the average exposure field of Koreans at each workplace using Equation 2, which is "working", and the actual measured values.

-According to Table 6, it is possible to easily estimate the living magnetic field at an individual's workplace by using the life characteristics variables of four individuals including RULE.

-In addition, the estimated error expressed by the absolute mean value of 15 subjects was excellent as 0.32mG.

3 shows the personal exposure magnetic field estimation pattern of estimation example-2 according to the estimation method of the present invention.

(Estimation Example-3)

Table 7 shows the sample of the subject's input data of the estimation example-3.

-Table 7 shows the degree of estimation error between the result of calculating the average exposure magnetic field of the Korean in the bedroom of the home using the equation (3) of the "bedroom equation" and the actual measured value.

-According to Table 7, it is possible to easily estimate the personal living field in the bedroom by using the life characteristics variables of six individuals including RULE.

-In addition, the estimated error expressed by the absolute mean value of the 15 subjects was excellent as 0.35mG.

4 shows a personal exposure magnetic field estimation pattern of estimation example-3 according to the estimation method of the present invention.

As described above, according to the present invention, the 24-hour personal exposure magnetic field estimation method according to the present invention provides an exposure level (exposure amount) in consideration of all the magnetic field sources that an individual may encounter in daily life, and thus the following advantages and It works.

1) It is possible to accurately estimate the average daily exposure field received by Koreans over elementary school students in the daily living environment within an error range of about 0.3mG.

2) Practical techniques for the investigation of electromagnetic health effects and epidemiological investigations in the field of evaluation were presented.

3) Since the size of the individual's exposure field is estimated by means of accurate estimation, it is not necessary to shorten the survey period, reduce the labor force for the epidemiological investigation, and obtain an economic benefit accordingly because it does not require an expensive magnetic field meter. have.

4) The issue of electromagnetic health, a social issue in Korea, at the time when the World Health Organization (WHO) published the draft 'precautionary policy based on prudent avoidance' in relation to human health effects from electromagnetic field exposure. By presenting one solution, it is expected to lead to a breakthrough technological shift in the field of electromechanical investigation and research.

5) Therefore, it is expected to be utilized for epidemiological research and investigation work on the health effects of the electromagnetic field and the establishment of magnetic field reduction measures, and ultimately contribute to the national health welfare technology.

Claims (5)

a) establishing an investigative survey database; b) applying an evolutionary algorithm to which genetic algorithm and genetic programming are applied in optimizing the field exposure estimate based on the constructed survey database; And c) Equation 4 below, which is the general form of the objective function in applying the genetic algorithm to the individual magnetic field exposure amount according to the living environment based on the applied evolutionary computation method [Equation 4]

MFExposure is an individual magnetic field exposure amount for each living environment, and k1, k2, k3, k4, k5, and k6 are variables having different values according to an investigator who is an estimation target of the individual magnetic field exposure amount for each living environment. , S is the sex of the investigator, male is 10, female is 20, A is the age of the examinee, the actual age is entered, H is the type of house where the subject resides, the apartment is 10, and the other is 20 is inputted, HS is the size of the house where the examinee resides, and the actual number of square meters is entered. , 60 for factory workers, 70 for department stores and large marts, 80 for hospital workers, 90 for train drivers, TL is the distance between tracks, within -15m, TL = 10, -15-49m, TL = 25 ,-Over 50m, each with TL = 50 The Rule is a 24 hour personal exposure field according to the living environment of Koreans, characterized in that the value is determined by the use time and the use time of PC, electric blanket, electric welding machine, special medical equipment as detailed rules of the examinee's life. Estimation method. delete The method of claim 1, wherein the subject is a general public, The individual magnetic field exposure amount according to the living environment in step c) is the following Equation 1 [Equation 1]

Where Rule, which is the detailed rule of the examinee's life, With electric shield with shut-off function at bedtime: + 1.5 mG With electric blanket without shut-off at bedtime: + 5.5 mG When using electric blanket for 3 to 4 hours in addition to bedtime: + 2 mG When using a PC with a CRT monitor: +0.4 mG / hour PC room: +0.4 mG / hour When using midnight electricity in homes: + 1 mG Close-up use of small table fan: + 4 mG / hour With arthroscopy: +3.45 mG / hour With CBC, EIA, Endoscope, ECG, Arthritis Equipment: 1.3 mG With X-ray, CT: + 1.48 mG During gas cutting operation: +2.0 mG / hour Near range use and narrow working environment of electric welder: + 2.0 mG / hour Long-term use and working environment of electric welder: +0.8 mG / hour, each input is characterized in that the 24-hour personal exposure field of Korean living environment. The method of claim 1, wherein the subject is an office worker, The individual magnetic field exposure amount according to the living environment in step c) is the following Equation 2 [Equation 2]

In this case, Rule, which is a detailed rule of the examinee's life, +5 mG for kitchens with microwave ovens, large refrigerators and water heaters Arthroscopy by hospital staff: + 6 mG / hour CBC, EIA, Endoscopy, Electrocardiogram, and Arthritis Equipment by Hospital Workers: 0.5 mG X-ray, CT by hospital staff: + 1.0 mG For lathe cutting by factory workers: + 0.5 mG Electric welding by factory workers 4 hours or less: + 2 mG CNC work by factory workers 4 hours or less: + 15 mG For electric welding 4-8 hours by factory workers: + 40 mG Employees near the electrical installation in the department store building: + 5 mG Operators who drive more than 60% of the total working hours of the train driver: + 1.0 mG each 24 hours personal exposure field estimation method for each living environment characterized in that the input. The method according to claim 2, wherein when applied to the bedroom, The individual magnetic field exposure amount according to the living environment in step c) is the following Equation 3 [Equation 3]

Is estimated by, where the investigator's life detailed rule RULE is With electric blanket with electromagnetic shielding: + 6 mG Electric blanket with electromagnetic shielding, with temperature 'steel' selection or when using two or more yaw thicknesses> 4 cm: + 2.5 mG When using an electric blanket without electromagnetic shielding function: A method of estimating a 24-hour personal exposure field for each Korean living environment, which is input at + 13 mG.

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