지중케이블 활선검출기를 위한 자장 센서 개발

김기준,오용철,이경섭,정한석,김탁용,최미희,송민영,신철기,김진사,Kim, Ki-Joon,Oh, Yong-Cheul,Lee, Kyeong-Seob,Jung, Han-Seok,Kim, Tag-Yong,Choi, Mi-Hui,Soung, Min-Yeong,Shin, Cheol-Gi,Kim, Jin-Sa 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2

We use the electrical energy and it is essential energy in modern life, but we lay cable underground due to the issue for environment and safety. Safety for worker is still insufficient for the development of safety equipment and related research has been focused on the cable lifetime diagnosis at underground cable work. I have to develop live line detector around the magnetic field were investigated at underground cable. In this paper, we were investigated by variation of coil turns and load due to detection of magnetic field at lines around. And detected value of developing products compared with measured value of milli-gauss meter. As a result, the value of the number of coil turns was found to be proportional to the measured value. But turn-numbers increase showed that the weak noise. I could be confirmed that sensor showed the optimum value from 4,000 to 5,0000.

한국의 마른 체형 소아에 대한 성장증보탕(成長增補湯)의 체중개선 효과

김기준,이준석,윤지현,류봉하,백희영,Kim, Ki-Joon,Lee, Joon-Suk,Yoon, Ji-Hyun,Ryu, Bong-Ha,Paik, Hee-Young 대한한방내과학회 2012 大韓韓方內科學會誌 Vol.33 No.2

Objectives : The aim of this study was to investigate weight gain effects of the Sungjangjeungbo-tang (Ch$\acute{e}$ngzh$\check{a}$ngz$\bar{e}$ngb$\check{u}$-tang) on thin Korean preschool children. Methods : Sungjangjeungbo-tang is composed of 9 herbs for treating indigestion. We analyzed 119 preschool children who visited Kim Kijoon Oriental Clinic BOM from Jan. 1, 2006 to Aug. 31, 2011 with three criteria: 1) 2~5yrs of age and BMI < 50th percentile on the baseline visit; 2) the child had taken the Sungjangjeungbo-tang for 1~3 month(s); and 3) the clinic had records of both height and weight on the baseline and at least once over 1~3 month(s). Results : Sungjangjeungbo-tang significantly improved BMI percentile in all groups. The changes in BMI percentile variations were larger in the 3 months group than in other groups, but not significantly. Gender, age and BMI on the baseline had no significant effects on the effectiveness of Sungjangjeungbo-tang. Conclusions : Sungjangjeungbo-tang positively affected on weight gain in thin Korean preschool children within 1~3 month(s) of treatment. However, additional studies on functional dyspepsia or the change of energy intake were needed to know the factors related to weight gains.

아스팔트 함량 측정을 위한 중성자 흡수체 및 감속재 설계

김기준,Kim Ki-Joon 한국컴퓨터산업학회 2006 컴퓨터産業敎育學會論文誌 Vol.7 No.1

국내에서 방사성동위원소를 사용하고자 할 때는 법적으로 규제 허용값이 $100[{\mu}Ci]$ 이하의 값에 맞추어 이용하도록 되어있다. 따라서 본 연구에서는 이 규제 허용값에 알맞은 아스팔트 함량 측정기를 개발하기위한 기본 자료를 설계하였다. 선원 및 검출기의 특성에 따라 측정기를 기하학적으로 모델링하였고, 몬테카를로 방법으로 해석하는 MCNP 코드를 이용하여 중성자 및 광자의 입자수송을 해석하였고, 선원과 검출기의 위치, 그리고 중성자 흡수체 및 감속재의 기하학적 구조를 설계하였다. In Korea, under the influence of the jurisdiction, usage of radioisotopes are limited. The limitation is $100[{\mu}Ci]$ or less. Therefore, in this study, basic data were designed, and the following data are needed in order to improve content measuring instrument which is suitable for radioisotopes limitation. Owing to the source and detector's properties, measuring instrument was designed geometrically, neutron and photon's particle transportation was analysed by using the MCNP code which is in Monte Carlo Method, also the location of source and detectors, geometrical structure of neutron absorber and moderator was designed.

수변전설비에서 접점 불량에 따른 열 및 전계 분포 해석

김기준,Kim, Ki-Joon 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5

Although there are existing Residual Current Protective Device (RCD) including detect electric leakage and elements such as short circuit and surge, the occurrence of incidents caused by electric faults, including fire, are still constant. The purpose of this study is to analyze the causes of accidents through the electric field distribution in the interpretation of the fault contact breaker. Simulation results by the arc fault has shown the convergence of temperature and electric field to the defect. Through their simulation results, the main cause of erosion phenomena in circuit breaker bar is the electric arc by concentration of electric field not due to dissolve by temperature.

3축 자계 측정 시스템의 개발

김기준,Kim, Ki-Joon 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.4

Nowadays, it is increasingly important to detect whether cables are live for the operator's safety if there is a sudden power failure. It is especially hard to detect the electrical field of an underground line because of shielding. This paper on detection of live-line states in cables studied the detection characteristics of the change in the magnetic field and axis as the frequency, voltage, and distance at the same load are changed using 3 axes. A search coil type was used as a magnetic field sensor with non-contact. We found that magnetic fields decrease proportionally to the square of the distance and the decrease of rated voltage with load effected to magnetic field. The magnetic field was detected by 3-axis sensors given correct proximity, but appeared as noise components beyond a distance of 2 cm.

아스팔트 함량 변화에 따른 중성자 검출에 관한 연구

김기준,Kim, Ki-Joon 한국컴퓨터산업학회 2007 컴퓨터産業敎育學會論文誌 Vol.8 No.1

본 연구에서는 아스팔트 함량 변화에 따라서 중성자 계측수가 어떻게 변화되는가를 계산하여 법적 규제 면제치인 $100[{\mu}Ci]$이하의 방사성동위원소를 이용한 아스팔트 함량측정기의 기본 설계 자료로 활용하고자한다. 이를 위하여 1차 년도에서 실시했던 설계자료를 활용하여 아스팔트 함량의 변화에 따라 중성자 계측수가 어떻게 증감이 이루어지고, 또한 감속재인 폴리에틸렌 주변에 흡수체인 카드늄판을 설치했을 때의 계측수의 변화를 MCNP 코드를 이용하여 살펴보았다. In this study, the change of neutron detection can be use the basic data of asphalt content detector under the influence of the jurisdiction and usage of radioisotopes are limited of $100[{\mu}Ci]$ or less. To obtain neutron detector's properties using design materials in first step phase, the change of neutron detection is to be calculated how can be increase or decrease due to the change of asphalt content, also it look over the change results which is installed absorber(cadmium plate) around moderator(polyethylene) using MCNP Code.

Electromagnetic Field Analysis of Magnetic Bearing due to Stator Structure

김기준,신철기,Kim, Ki-Joon,Shin, Cheol-Gi The Institute of Electronics and Information Engin 2011 電子工學會論文誌 IE (Industry electronics) Vol.39 No.4

본 연구에서는 스테이터 구조에 의한 마그네틱 베어링의 전자장해석을 수행하였으며 AMB 시스템의 설계 기준을 얻기 위하여 3가지 방식의 구조에서 전기적 특성을 구하였다. FEM 기법을 이용하여 AMB의 3가지 방식을 시뮬레이션한 결과, 1, 2, 그리고 3번 방식은 N극에서 S극으로 많은 자속선 벡터가 이동하는 것으로 나타났으며, 이 자속선들은 로타로 전달되고 있다. 이 선들은 로타가 회전하는 것을 도와주고 있다. 따라서, 이러한 전기적 특성 자료는 마그네틱 베어링 설계자료로 이용되고, 설계 기준을 만드는데 도움이 될 것이다. In this study, it carried out Electromagnetic Field Analysis of Magnetic Bearing due to stator structure and it got the electrical characteristics of 3 structure types of AMB(Active magnetic bearing) systems to get optimal design criteria. The results of simulation in three types of AMB, using FEM method, type 1, 2, and 3 had many paths to move magnetic flux vectors from N pole to S pole and magnetic flux lines are transferred to rotor as a shaft. The paths help to rotate the rotors. So, their data of electrical properties carry out design of magnetic bearing system and the data help to make design criteria.

코어 변화에 대한 자계 특성

김기준,Kim, Ki-Joon 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2

In this paper, it tried to develop the core sensor for detection of micro magnetic field in electric wires. The sensor is non contact type and is consisted of ferrite core for low price. To investigate their properties for variations of current, it changed the number of winding and the length of sample core, it examined, to check the live wire situation in built-in wires, electrical characteristics due to difference between electric wires and core sensor. As the results, it verified live wire situation at the number of winding(5,000) and within length of 6[cm]. Also, it obtained magnetic field magnitude decreased inverse proportion ratio to a square about difference between electric wires and core sensor.

군집 최적화를 이용한 열화 진단 알고리즘 개발

김기준,Kim, Ki-Joon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.2

In this paper, properties of pattern using LBG (Linde-Buzo-Gray) Algorithm was explored including the exactness of K-means algorithm and process time of EM (Expectation Maximization) algorithm in order to develop analysis algorithm of partial discharge pattern in a cable using acoustic data analysis system. Partial discharge was measured by generating inner fault due to lamination of XLPE which is used for cable insulation material. Discharge pattern was analysed by changing the number of swarm article to 2, 4, and 6 in order to interpret swarm structure and properties.

초고압 선로 진단장치용 외함 절연설계

김기준,Kim, Ki-Joon 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.3

In this paper, in order to avoid equipment malfunction due to electromagnetic waves, which can occur when high-voltage live line diagnostic device fabrication, the enclosure structure of the diagnostic device with power lines that can minimize the EMI (electromagnetic interference) was modeled using the FEM (finite element method). Simulation examined the strength of the electric field in the required thickness, material and regions where there is a control board while changing the curvature radius of the corner making the enclosure, and By applying a mechanical design and simulation results that occur during the actual production has been designed for the final design. Most of the simulation results for the electric field is concentrated in the final model, the inner edge of the enclosure could be confirmed that the stable structure.