고추中 殘留農藥의 經時的 및 乾燥方法에 따른 變化

민필기,민용규 충북대학교 농업과학기술연구소 1998 農業科學硏究 Vol.15 No.-

Chlorothalonil, procymidone, deltamethrin and benomyl were selected for this investigation among pesticides, the maximum residue limits of which were already established. Each sample was classified as group A, B, and C, and sprayed with different concentrations. The changes in pesticide residues at different concentrations and with lapse of time were investigated. The results are as follows : 1.The pesticide residues rapidly decreased 5 days after spray but decreased slowly with lapse of time. 2.The residue level of benomyl decreased abruptly from 23.93 to 0.00 ppm with time, whereas those of chlorothalonil, procymidone, and deltamethrin reduced from 16.73 to 0.09 ppm, from 13.23 to 0.15 ppm, and from 7.17 to 0.06 ppm, respectively. 3.Higher levels of pesticide residues were detected in dried red pepper than in unripe-fresh red pepper and more residues were present in sun-dried samples than in oven-dried ones, with the exception of deltamethrin. 4.The periods of time when the residual amounts of chlorothalonil, procymidone, deltamethrin and benomyl were below the respective maximum residue limits (MRL) were 9, 1, 11 and 3 days, respectively, after the spraying of the recommended amount of each chemical. However, the actual amounts of pesticides taken up by humans in daily life would be very small, since about 90% of the residues would probably be removed during the washing process.

저손실 스너버 회로를 이용한 유도 전동기의 서지전압 억제

서기영,문상필,김주용,박진민 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

The development of advanced Insulated Gate Bipolar Transistor(IGBT)has enabled high-frequency switching operation and has improved the performance of PWh4 inverters for motor drive. However, the high rate of dv/dt of IGBT has adverse effects on motor insulation stress. In many motor drive applications, the inverter and motor are separated and it requires long motor type. The long cable contributes high frequency ringing at the motor terminal and it results in hight surge voltage which stresses the motor insulation. The inverter output filter and RDC snubber are conventional method which can reduce the surge voltage. In this paper, we propose the new low loss snubber to reduce the motor terminal surge voltage. The snubber consists of the series connection of charging/discharging capacitor and the voltage-clamped capacitor. At IGBT turn-off, the snubber starts to operate when the IGBT voltage reaches the voltage-clamped level. Since dv/dt is decreased by snubber operating, the peak level of the surge voltage can be reduced. Also the snubber operates at the IGBT voltage above the voltage-clamped level, the snubber loss is largely reduced comparing with RDC snubber. The proposed snubber enables to reduce the motor terminal surge voltage with low loss.

ZVT-PWM 승압형 컨버터를 이용한 무전극 램프의 역률 개선

서기영,문상필,박진민,김주용 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

무전극 램프(EFC)의 전등은 램프 양단에 고주파를 갖는 고전압을 인가해야 한다. 종래의 무전극 램프의 구동 회로로 선형 증폭기가 이용되어져 왔으나, 낮은 에너지 변환 효율로 인해 PWM 스위칭 방식의 인버터로 교체되고 있다. 그러나 고주파 스위칭시 인버터의 스위칭 소자에서 스위칭 손실의 증가 및 노이즈 발생의 문제로 인해 PWM 인버터는 고주파 동작이 제한된다. 이러한 문제점을 해결하기 위해 영전압 스위칭 기술을 PWM 인버터에 적용하여 고주파 스위칭이 가능하고, 또한 스위칭 손실과 노이즈 발생을 줄일 수 있다. 본 논문에서는, 무전극 램프 구동용 인버터의 역률 개선 회로로서 이용될 수 있는 승압형 컨버터에 있어서 소형화 및 고전력 밀도에 큰 장점을 갖는 영전압 천이 PWM 승압형 컨버터에 관한여 서술하였다. 영전압 천이 PWM 승압형 컨버터의 정상상태 동작을 구간별로 해석하였으며, 이를 통하여 영전압 스위칭 조건을 도출하였다. 또한 이 컨버터를 무전극 램프 구동용 인버터의 역률 개선 회로에 적용, 실험을 하였으며 그 결과 0.99이상의 역률을 달성함을써 역률 개선 동작의 타당성을 입증하였다. Driving the electrodeless fluorescent lamp, the high AC voltage with high frequency is required. The linear power amplifier has been widely used as a driving circuit of electrode-less fluorescent lamp(EFL). However, the low efficiency of the power amplifier causes the driving circuit to be replaced by a PWM switching inverter. In other to use a PWM switching inverter as the driving circuit of an electrode-less fluorescent lamp, the high switching frequency is required But due to the switching loss at switches of the inverter, the limitation of high switching frequency appears in the inverter. One solution to this limitation is to reduce the switching loss by using the zero voltage switching technique. In this paper, an application of the ZVT-PWM(Zero-Voltage-Transition) boost converter, which has great advantage on mini-on and high power density, to the power factor correction circuit of the EFL(Eiectrode1ess Fluorescent Lamp) inverter i s studied. The operation principle of the converter are described to identify the power factor correction characteristics of the inverter. Experimentally obtaining the high power factor above 0.99, it is verified that the power factor correction of the EFL inverter successfully achieved.

감광제/광촉매에 의한 시설환경의 정화

이재구,이용필,안기창,김일근,채홍민 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-

일반 생활환경 또는 원예시설 내의 공기오염물질중 하나인 잔류 농약 및 병원성 미생물을 제거하기 위한 방법으로 자연광 또는 인공광 조건에서 몇 가지의 감광제/광촉매에 의한 광분해 촉진효과와 미생물 살균효과 시험을 수행하였다. 감광제로는 quinone계 물질 PS-1, aromatic ketone계 PS-2, aromatic amine계 PS-3, organic acid salt의 PS-4, inorganic compound의 PC-1, inorganic metal compound의 PC-2와 PC3를 선발하여 사용하였다. 그리고 시험 농약으로 시설내 병해충 방제농약인 살충제 carbofuran, 살균제인 diethofencarb, metalaxyl, benomyl, thiram, propineb, iprovalicarb를 선정하였고, 유해 미생물로는 5종의 곰팡이와 3종의 세균성 식물 병원균들을 선정하였다. 농약의 광분해 촉진효과로는 대체적으로 PS-1, PS-2, PS-3, 그리고 PC-2에서 감광제/광촉매를 처리하지 않은 처리구에 비해 높은 분해율을 보였다. 미생물 현탁액에서는 광촉매에 의한 곰팡이의 살균효과는 없었으나 병원성 세균의 성장은 광촉매에 의한 저해가 뚜렷하였다. 위의 결과에서 볼 때 광조건하에서 감광제/광촉매의 사용은 농작물이나 또는 토양표면에 잔류하는 농약의 광분해나 병원성 미생물을 제거하여 보다 안전한 농산물을 생산함은 물론 토양을 위시한 주변환경중의 농약잔류물을 경감시킴으로서 환경보호 및 재배시설내의 작업자와 일반대중의 건강 증진에 커다란 도움이 되리라 기대된다. For the artificial removal of pesticide residues and pathogenic microorganisms in the greenhouse or in the living environment, the accelerated photodegradation and the biocidal effects by some photosensitizers(PS)/photocatalysts(PC) were tested under the sunlight or artificial light. The test pesticides included thiram, diethofencarb, propineb, benomyl, metalaxyl, and iprovalicarb as fungicides, carbofuran as an insecticide, and some bacteria and fungi as the pathogenic microorganisms. PS-1, PS-2, and PC-1 led to the accelerated photodegradation of all the tested pesticides compared to the control without PS/PC under the sunlight. The photocatalysts had no effect on the growth of the fungi in aqueous suspension. Whereas, the PC-2 and PC-3 added to the bacterial suspensions obviously inhibited the microbial growth under the artificial light. These results suggest that the photosensitizers/photocatalysts in the presence of light can decrease some pollutants in the facility environment and hence they can be used to reduce the exposure of the workers in the environment to the harmful pollutants. Key words: Photosensitizer, photocatalyst, photodegradation, pesticide, biocide, bacteria, fungi

심장내로 연장된 정맥내 평활근종증 1예 : 심장내 평활근종증 intracardiac leiomyomatosis-case report and literature review

정재헌,민필기,박소영,변영섭,홍그루,임세중,심원흠 대한내과학회 2003 대한내과학회지 Vol.65 No.2

정맥내 평활근종증은 병리학적으로는 양성 질환이나 진행 양상은 악성으로 모든 종양의 적출술이 시행되어야 하며, 자궁적출술시 병리학적으로 정맥내 평활근종증을 진단받은 경우 정기적인 검사를 통해 종양의 재발이나 하대정맥과 심장내로의 연장을 확인하여야 한다. 우측 심장내 종양이 발견된 경우는 점액종을 포함한 원발성 심내 종양 외에도 다른 원인 질환을 확인하여야 하며, 반드시 정맥내 평활근종증을 감별진단하여야 한다. Intravenous leiomyomatosis is a rare benign vascular tumor defined as the extension into venous channels of a histologically benign smooth muscle tumor arising either from a uterus or from the walls of uterine vessels, and about 10% spread to the heart. The treatment of choice is complete resection of the tumor. Hormonal therapy should be considered in cases of unresectable residual tumor. A 46-year-old woman was admitted for abdominal discomfort and pain. She was found to have intravenous leiomyomatosis of the uterus with extension into inferior vena cava and right atrium. The patient underwent surgery employing simultaneous sternotomy and laparotomy. Radical excision was achieved using cardiopulmonary bypass. We herein describe a patient in whom complete removal of intravenous leiomyomatosis with cardiac extension was successfully performed.

전방 또는 전측방 흉수 종양 수술에서 후측방도달법

조경석,박춘근,성재훈,허필우,박춘근,백민우,김달수,강준기 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.5

응급 의료 센터내 사망 환자의 분석

유인술,김준식,진재우,이철주,민영기,조준필 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

We need the constitute of Emergency medical system that connect prehospital care of inhospital care effectively for optimal treatment of emergency patient. The analysis of actual condition of our emergency medical system, through study of mortality case in emergency medical center will be a aid to the constitute. The authors performed a review on the records of 60 cases who died in Ajou university Emergency medical center during management, since June 1994 to september 1995. Among the 60 patient, 72% were male and 28% were female. In nontrauma patient, 6th decade was many, in trauma patients, 3rd and 5th decade was many. Among the 60 patient, 33% were traumatic cases, 66% were nontraumatic cases. Among the traumatic patients, more than half of the cases were due to motor vehicle accidents. The most frequent time interval from onset of emergent situation to arreving at emergency center was more than 2 hours. The most common transfer method was by 119 ambulance. In most cases, prehospital treatments were not taken. In most cases, initial mental status was comatose, and systolic blood pressure was less than 60 mmHg. Most cardiovascular resuscitation was done in 30 min. to an hour. In cases as traffic accident of ischemic heart disease, where rapid transportation of the patient is critical for the patient's survival, however, in most cases it took more than two hours to bring such patients to hospital, and first aid treatment before arrival to hospital was rare. No prehospital treatment was done to nearly all patient. In many cases the patient was already in under coma or shock state. The inhospital care at emergency center was made relatively quickly and adequately. The mean duration of cardiopulmonary resustation was 30min to one hour. From this study, we could notice the poor quality of prehospital care in the region ,near Ajou university hospital, and we came to know that the improvement of quality of prehospital care was the most important factor to reduce the motality of emergency department patient. that is, in the treatment of emergency patients, weak points has been revealed in the pre-hospital treatment, the improvement of which is important factor for the survival of emergency patients.

Heterogeneous expression and Silica deposition activity of predicted cathepsin L-like protein from Nematostella vectensis

Ki Baek YEO,Mi Ran KI,Joo Hee JANG,Eui Kyoung JANG,Ki Ha MIN,Young Ha RYU,Seung Pil PACK 한국생물공학회 2013 한국생물공학회 학술대회 Vol.2013 No.4

Dual Expression Method for Chimeric Ferritin Using Self-assembly

Ki Ha MIN,Kyung Hee KIM,Mi-Ran KI,Sung Ho KIM,Jin Woo SHIN,Seung Pil PACK 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.4

Detection of Inflammated Cell by Antibody-Beads Conjugation

Ki Baek YEO,Eui Kyoung JANG,Mi-Ran KI,Bashistha KANTH,Ki Ha MIN,Seung Pil PACK 한국생물공학회 2011 한국생물공학회 학술대회 Vol.2011 No.10