Hepatic Cirrhosis Occurring in a Young Woodchuck(Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus(WHV)

Kyu-shik Jeong,정원일,Jae-yong Chung,Mi-young An,Chae-yong Jung,Gyoung-jae Lee,Jong-soo Kang,Byeong-cheol Kang,Young-heun Jee,Bruce H Williams,Young-oh Kwon,Da-hee Jeong 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

Cirrhosis Occurring in a Young Woodchuck (Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus (WHV)Da-hee Jeong, Won-il Jeong, Jae-yong Chung, Mi-young An, Chae-yong Jung, Gyoung-jae Lee1, Jong-soo Kang1, Byeong-cheol Kang2, Young-heun Jee3, Bruce H Williams4, Young-oh Kwon5 and Kyu-shik Jeong*College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea1Shinwon Scientific Co., LTD, Research Institute, Suwon, Korea2Clinical Research Institute, Seoul National University, Seoul 110-744, Korea3College of Veterinary Medicine, Jeju National University, Jeju 690-756, Korea

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

전류-턴 곱을 이용한 역률제어용 인덕터의 설계

정용채 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.4

The core selection plays an important role in the inductor design. Inparticular, the ampere-turn product is proportional to the power handingcapacity. Thus, in this paper, the inductor design procedure for a powerfactor correction(PFC) is proposed using an ampere-turn product. Moreover,the design method is explained in detail. To confirm the design result, some simulation results are presented. Key Words : Ampere-Turn Product, PFC, Inductor Design, Core Selection

유도가열조리기를 위한 고정주파수 직렬 공진형 하프브릿지 인버터 회로

정용채 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.4

Abstract : The fixed frequency control method for a series resonant half bridge inverter circuit is proposed to avoid the interferential acoustic noise between the adjacent two loads. The noise arises from the difference between operating frequencies of adjacent loads. Thus, the fixed frequency control method is a good solution. In the paper, the method applies to a series resonant half bridge inverter circuit. And, some operational characteristics are presented briefly. To verify the proposed control method, the simulation results are carried out in detail. Key Words : Fixed Frequency, Series Resonant, Induction Heating, Acoustic Noise

潛水된 直立圓柱의 波週期와 最大波力의 關係

鄭榮采 군산대학교 1987 群山水産專門大學 硏究報告 Vol.21 No.2

This study is concerned with the choice of wave period arising maximum wave forces loading on the submerged of offshore structure from regular waves of a given height and described about the relationships between Morison's equation and wave coefficients. Also, the procedure estimating maximum wave forces and optimal wave period is introduced and tested through the numerical examples. The results obtained from this work are as follows. The work that choses applicably CD and CM values considered the particular ocean environment at the site of installation of offshore structures is very important to the design of those. 2. The maximum wave forces decrease and the optimal wave periods increase with increase in the depth of immersion. 3. The phase angles arising the maximum wave forces decrease with increase in the given height of wave . 4. Fig. 5 obtained from the mumerical relationships between Y and T will be used availably to detremine the maximum wave forces loading on cylinders which is submerged below still water level from regular waves. 5. The maximum steepness waves have not always the worst conditions for the member submerged below the still water level. 6. The elements which predominately influence upon the wave coefficients are Reynolds number, Keulegan-Carpenter number and the diameter of cylinder to wave length ratio.

주파수 변조기법을 이용한 전자레인지용 직렬 공진형 하프 브릿지 인버터

정용채 남서울대학교 2002 남서울대학교 논문집 Vol.8 No.-

In this paper, the inverter circuits applied to high-quality microwave oven are investigated and compared with each another. Then a suitable circuit is selected for United States of America market which use 120V utility line. Operation and characteristic for each circuit are explained in brief. If the choosing circuit is controlled by fixing frequency PWM method, the operating rate of magnetron (MGT) is reduced. Thus, the output power of MGT cannot be raised because the current of MGT is limited to any level. Therefore, a frequency modulation technique is proposed cope with this problem. Since the operating rate of MGT can be improved using the frequency modulation technique, the output power can be enhanced to a higher level. To verify the abovementioned point, inverter circuit with 120V 2kW input consumption is manufactured and tested. Throughout the experimental results, an improvement of the operating rate of MGT can be confirmed.

하나의 추가 스위칭 소자를 갖는 개선된 유사병렬 공진형 DC 링크 인버터

정용채 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1

A new improved quasi-parallel resonant DC link (IQPRDCL) circuit is proposed for soft switching a three-phase pulse-width modulation (PWM) inverter. By inserting only one additional switching device, the circuit has not only minimum voltage stresses for all switching devices but also an enhanced PWM capability due to providing the variable on-off instants of the resonant link. Operational principles and analyses are presented in detail. Some experimental results are also presented to verify the link operation.

발열을 동반한 호중구감소증에서 Cefepime 단독투여와 Ceftazidime 및 Tobramycin 병합투여의 효능비교

정현욱,채제욱,강미라,양정채,문치숙,기현균,장현하,오원섭,김기현,백경란,이남용,송재훈 대한감염학회 2004 감염과 화학요법 Vol.36 No.6

목적 : 국내에서 발열을 동반한 호중구감소증이 있는 악성 종양환자에게 경험적 항생제로 베타락탐계 항생제와 아미노배당체의 병합요법의 사용이 일반적이다. Cefepime은 광범위 항균 작용을 가지고 있어, 그람 음성균 뿐만 아니라 그람 양성균에 대해서도 우수한 효과를 나타낸다. 재료 및 방법: 발열을 동반한 호중구감소증이 있는 악성 종양환자를 대상으로 무작위, 공개, 비교 연구를 시행하였다. 대상 환자를 무작위로 cefepime 단독요법군과 ceftazidime 및 tobramycin 병합요법군으로 나누어 투여하고 각각의 임상적 효능과 안전성을 비교하였다. 구강및 인후 점막염이 있는 환자에서 분리된 녹색 연쇄알 구균에 대한 항생제 내성 정도를 조사하였다. 결과 : 대상환자 89명 중 CA 투여군이 48예(53.9%), CT 투여군이 41예(46.1%)이었다. 발열의 유형별로 MDI는 18예(20.2%), CDI는 9예(10.1%), UF는 62예(69.7%)로 두 군 간에 차이가 없었다. CA 투여군과 CT 투여군의 임상적 호전률은 시험약 투여 후 2-4일째 각각 91.7%, 85.4% (P=0.31), 치료 종료 시 각각 91.7%, 100% (P=0.15)로 두 군간에 유의한 차이가 없었다. 치료 종료 시 CA 투여군과 CT 투여군의 세균학적 소실률은 모두 100%로 두 군간의 유의한 차이가 없었다(P=0.78). 점막염이 있는 환자로부터 녹색 연쇄알 구균이 분리된 경우는 25예(28.1%)이었으며, 분리된 녹색 연쇄알 구균은 penicillin, ceftriaxone, cefepime, vancomycin에 모두 감수성을 보였다. 약제 관련 이상 반응의 발생 빈도도 두 군간에 유의한 차이가 없었다. 결론 : 발열을 동반한 호중구감소증이 있는 악성 종양환자의 경험적 항생제로서 cefepime 단독요법은 ceftazidime 및 아미노배당체의 병합요법만큼 효과적이고 안전하였다. Background : Broad-spectrum antibiotic therapy has been recommended as an empirical regimen in cancer patients with febrile neutropenia. Cefepime is a fourth generation cephalosporin with good activity against both gram-positive cocci and gram-negative bacilli. Materials and Methods : To compare the efficacy and safety of cefepime alone with ceftazidime plus tobramycin as empirical regimen for adult cancer patients with febrile neutropenia, a randomized, open label, comparative trial was performed. If the patient showed clinical improvent 72 hours, antibiotic could be changed to oral ciprofloxacin. Clinical and microbiological responses were determined at 72 hours and at the end of therapy. To investigate the antimicrobial resistance of viridans streptococci, swab cultures were obtained from throat in all enrolled patients and antimicrobial susceptibility tests were performed by using microdilution method according to the NCCLS. Results : A total of 89 patients were enrolled. Forty-eight patients received cefepime alone (CA), and 41 patients received ceftazidime plus tobramycin (CT). Demographic and baseline clinical characteristics were similar in both groups (P>0.05). The initial clinical success rate at day 2-4 in group CA (91.7%) was similar with that in CT group (85.4%) (P=0.31). At the end of therapy, the final clinical success rate in CA group (91.7%) was similar to that in CT group (100%) (P=0.15). In 18 patients, with microbiologically defined infections, the eradication rate was 100% in both groups. Adverse events including liver dysfunction (21.3%) and renal dysfunction (2.2%), were similar in both groups (P=0.87). Viridans streptococci were isolated from the throat cultures in 25 cases, and all of these strains were susceptible to penicillin (MIC_(90) 0.12 ㎍/mL), cefepime (1 ㎍/mL), and vancomycin (0.12 ㎍/mL). Conclusion : Efficacy and safety of cefepime monotherapy was comparable to the combination of ceftazidime and tobramycin. It could be used as an alternative empirical regimen for treating cancer patients with febrile neutropenia.

스포츠의 환경문제에 대한 정책비판과 해결 방안

채용기,이정식 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this is study was to discuss the operation and task of is ports environment policy in korea. This paper attempt to discuss factors contributing to circumstances and endeavor to imply possible is solution for environmental policies related to is port. The back ground and current is situation were analyzed and future recommendations made. mindful that a clean and healthy environment is essential for those taking part in is port and that many is port organizations and participants contribute actively to environmental protection. However, these was no consideration and program related to resolution on is port and environment in korea. Since 1990s, the is strategic choices and legislation for environmental issues have is systemized by the government level otherwise, the policies for is port and the environment have not is et is systematically because there has not tried undertake research and investigate way to measure environmental impact of is port. korea is port-environment policy has not any is social conditions to discuss on the problems itself such as man, is structure equipment, is kill and burdget more is seriously and reasonably. and the affairs between related stations was duplicated and was net provided with policy accepted to sectional traits korea is ports-environmental policy contained the is everal problems as is such. 1. korea is port-environment has political backwardness such as the day after the fair. 2. korea is port-environment affairs was scattered. 3. korea is port-environment is systems is centralized systematically. And in order environment policy, we should observe the Several principles as such. 1. we should observe important thesis of human being respet. 2. we should compose the multiple and system. 3. we should exclude the variable of environment-problems at first. 4. we should observe the principle of the causer responsibilities.

화상처리를 이용한 물체의 운동 파라미터 추정

정남채,문용선,박종안 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.2

In case a robot works in space of gravity-free state, it is difficult to estimate object motion parameters because of control problem of itself and moving objects. The nature and parameters of short term motion can be estimated continuously with the goal of understanding motion through the image processing. This paper proposes a method which solves correspondence of feature points when we estimate object motion parameter from image information of freely moving objects in space of gravity-free state. Replacing the inertial coordinate system with the camera coordinate system which is equipped within a space robot, computer simulation results are investigated to be able to analyze a problem of correspond points from image information, and to obtain sequence of angular velocity ω which determine a motion of object.