일부 한국 성인 남성 흡연자들의 림프구 DNA 손상의 증가

이주현,오은하,이준영,설동근,김주자,이은일,Lee, Joo-Hyun,Oh, Eun-Ha,Lee, June-Young,Sul, Dong-Geun,Kim, Joo-Ja,Lee, Eun-Il 대한예방의학회 2007 예방의학회지 Vol.40 No.1

Objective : The purpose of this study was to evaluate the levels of DNA damage in human lymphocytes caused by smoking and other lifestyle factors. Methods : The study population consisted of 173 normal healthy male adults from 21 to 59 years old. The demographic and lifestyle variables were obtained from administered questionnaires. The level of lymphocytic DNA damage in the peripheral blood was evaluated by the Comet assay. Statistical analyses were done by general linear model analysis and Dunnett's multiple comparison. Results : The difference in DNA damage between smokers and non-smokers was statistically significant. The means for the Tail%DNA were found to be 10.48 in the current smokers and 9.60 in the non-smokers (p < 0.05). The tail moment means were 1.58 and 1.45 (p < 0.05) for the current smokers and non-smokers, respectively. The number of cigarettes smoked per day did not result in a significant difference in the level of DNA damage among the smokers. Other lifestyle factors such as age, and drinking and exercise habits were not related to DNA damage. Conclusions : The DNA damage in the lymphocytes of smokers was found to be significantly higher than that for non-smokers. However, the number of cigarettes smoked per day was not related to DNA damage. Further study is needed to evaluate the relationship between the amount of smoking and level of damage to DNA. In addition, the status of DNA repair activities should be assessed.

원격 방사선 측정을 위한 ZigBee 원칩형 통신 모듈 설계에 대한 연구

이주현,이승호,Lee, Joo-Hyun,Lee, Seung-Ho 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.4

This paper suggests how to design a ZigBee-chip-based communication module to remotely measure radiation level. The suggested communication module consists of two control processors for the chip as generally required to configure a ZigBee system, and one chip module to configure a ZigBee RF device. The ZigBee-chip-based communication module for remote radiation measurement consists of a wireless communication controller; sensor and high-voltage generator; charger and power supply circuit; wired communication part; and RF circuit and antenna. The wireless communication controller is to control wireless communication for ZigBee and to measure radiation level remotely. The sensor and high-voltage generator generates 500 V in two consecutive series to amplify and filter pulses of radiation detected by G-M Tube. The charger and power supply circuit part is to charge lithium-ion battery and supply power to one-chip processors. The wired communication part serves as a RS-485/422 interface to enable USB interface and wired remote communication for interfacing with PC and debugging. RF circuit and antenna applies an RLC passive component for chip antenna to configure BALUN and antenna impedance matching circuit, allowing wireless communication. After configuring the ZigBee-chip-based communication module, tests were conducted to measure radiation level remotely: data were successfully transmitted in 10-meter and 100-meter distances, measuring radiation level in a remote condition. The communication module allows an environment where radiation level can be remotely measured in an economically beneficial way as it not only consumes less electricity but also costs less. By securing linearity of a radiation measuring device and by minimizing the device itself, it is possible to set up an environment where radiation can be measured in a reliable manner, and radiation level is monitored real-time.

CMOS 이미지 센서를 사용한 방사선 측정에 관한 연구

이주현,이승호,Lee, Joo-Hyun,Lee, Seung-Ho 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.2

In this paper, we propose the radiation measuring algorithm and the device composition using CMOS image sensor. The radiation measuring algorithm using CMOS image sensor is based on the radiation particle distinguishing algorithm projected to the CMOS image sensor and accumulated and average number of pixels of the radiation particles projected to dozens of images per second with CMOS image sensor. The radiation particle distinguishing algorithm projected to the CMOS image sensor measures the radiation particle images by dividing them into R, G and B and adjusting the threshold value that distinguishes light intensity and background from the particle of each image. The radiation measuring algorithm measures radiation with accumulated and average number of radiation particles projected to dozens of images per second with CMOS image sensor according to the preset cycle. The hardware devices to verify the suggested algorithm consists of CMOS image sensor and image signal processor part, control part, power circuit part and display part. The test result of radiation measurement using the suggested CMOS image sensor is as follows. First, using the low-cost CMOS image sensor to measure radiation particles generated similar characteristics to that from measurement with expensive GM Tube. Second, using the low-cost CMOS image sensor to measure radiation presented largely similar characteristics to the linear characteristics of expensive GM Tube.

아세토니트릴 내에서의 Ag⁺ 이온의 배위수와 음이온 효과

이주현,조한국,Lee, Joo-Hyun,Cho, Han-Gook 대한화학회 2009 대한화학회지 Vol.53 No.5

방사선 측정장치의 저준위 방사선 측정과 방사선량의 급격한 변화에 따른 장치의 반응 속도개선에 관한 연구

이주현,이승호,Lee, Joo-Hyun,Lee, Seung-Ho 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.4

This paper suggests an algorithm to measure low-level radiation by radiation measuring devices, and the other algorithm to improve reaction speed of the device to better respond to dramatic changes in radiation amount. The former algorithm to improve the accuracy of measuring low-level radiation takes advantage of a dual window radiation measurement method which is based on accumulated average of pulses gathered by a radiation measuring sensor. The latter algorithm is to enhance reaction speed of a measuring device to more sensitively react to dramatic changes in radiation amount by adopting a dual window radiation measurement method which analyzes data patterns newly put into for six seconds. To verify the suggested algorithms, a hardware-which consists of sensor and high-voltage generator, controller, charger and power supply circuit, wireless communication part, and display part-was used. Tests conducted on the dual window radiation measurement method as used in the suggested algorithm have proved that accuracy improves to measure low-level radiation of 5uSv/h, and linearity also gets better. Other tests were conducted to see whether the suggested algorithm enhances the reaction speed of a radiation measuring device so that the device responds better to dramatically changing radiation amount. The experimental results have shown meaningful changes in numbers after six seconds. Therefore, the conclusions are made that the algorithm enhances the reaction speed of the device.

발전기 제어시스템의 점호제어에 관한 연구

이주현(Joo-Hyun Lee),임익헌(Ick-Hun Lim),류호선(Ho-Sun Ryu),정태원(Tae-Won Jeong) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-

발전기 제어시스템은 동기발전기의 무효전력 또는 단자전압의 변화에 제어기의 출력신호에 따른 점호제어를 통하여 발전기 계자에 흐르는 전류를 자동조정 함으로써 발전기 단자전압을 목표 값으로 신속하고 안정하게 유지하게 된다. 본 논문에서는 발전기 제어시스템의 위상제어 정류기에서 점호제어 방식에 대하여 살펴보고 점호제어 회로의 특성분석과 실제 발전기 제어시스템에 적용된 결과를 기술하고자 한다.

Lamp Satgat

Lee, Joo Hyun(이주현) 한국기초조형학회 2024 한국기초조형학회 작품집 Vol.2024 No.1

실시간 시뮬레이터를 이용한 디젤발전기 여자시스템 현장시험

이주현(Joo-Hyun Lee),류호선(Ho-Sun Rhew),정태원(Tae-Won Jeong) 대한전기학회 2010 전기학회논문지 Vol.59 No.7

The excitation control system of an emergency diesel generator is classified as a kind of safety-related system. Compared with other control systems in a power plant, this system is required to be more reliable and have better performance. KEPCO Research Institute successfully developed the excitation control system for a diesel generator. This paper presents its field test results by using a real time simulator on a nuclear power plant.

화력발전소 관류보일러의 과열기 온도제어에 관한 연구

이주현(Joo-Hyun Lee),정태원(Tae-Won Jeong) 대한전기학회 2009 전기학회논문지 Vol.58 No.10

An supercritical once through boiler system has been used in the korea standard-type thermal power plant. It is critical in boiler operation that superheater temperature should be controlled within the specified limit. In this paper, control logic scheme is suggested for superheater temperature in once through boiler. Finally the simulation result using process model based simulator shows the validity of suggested control logic.

Glucosinolate 생산을 위한 고추냉이 뿌리 현탁배양

이주현(Joo Hyun Lee),이용범(Yong Beom Lee) 한국원예학회 2009 한국원예학회 학술발표요지 Vol.2009 No.5