全南地域 市間의 都市生活環境 測定에 관한 硏究

권준오,이창현,김재원 조선대학교 국토개발연구소 1994 국토개발연구 Vol.14 No.2

City is a place where various ways of life exist and therefore the demend for urban environment extends order various dimensions. The purpose of dissertation lis as follows; First, dimensions of urban environments are classified into several categories, secondly, indicators are selected for each category, thirdly, measurements are carried for each indicator, fourthly, indicators are summarized according to the classification done before. In conclusion, the level on disparity of urban living environment among city in cheon-nam region is very large. Cheon-nam region should have the effective housing system and administrative system so as to maintain the high level of urban life and increase the quality of life.

宅地開發事業에 있어서 計劃的 都市構成 要素와 事業施行後 나타나는 構成과의 差異點에 關한 硏究

권준오,김재원,정명희,이도범 조선대학교 국토개발연구소 1997 국토개발연구 Vol.17 No.1

The writer has studied the differences between the original plan and real problems occurred in the working process of developing housing lots around Bijun District and Jungui District carried by KLDC according to the housing site development special law. And I has analyzed the reasons, and suggest methods for improvement; First, in the point of creating cities : In calculating planned population, various conditions of the city should be totally reviewed; population utilizing the facilities should be considered in the light of prospect of future development; in location planning of facilities, bus service route, present state of utilizing the neighbored lands and planning should be considered. Second, in the point of utilizing land : To make up the esale right for the buildings which are against land categories; to make different division of lots according to the width of neighbored loads and its distance from central facilities, and it will lead to the change of using land. Third in the point of traffic : To reflect bus service route in establishing street plann and land use plan : to make sure of street network and to control direct connection between main route and readjusted route.

世宗의 御製東國正韻과 申淑舟등의 反切

權在善 대구대학교 인문과학연구소 1985 人文科學硏究 Vol.3 No.-

內外統制性格에 따른 特殊兒童에 대한 敎師知覺의 一硏究

권기덕,정재권 대구대학교학생생활연구소(학생생활상담실연구부,학생생활상담센터) 1983 학생생활연구 Vol.6 No.-

都市近郊農家의 農業經營形態에 관한 硏究

金再洪,申東完,愼鏞仁,權容大 韓國農業政策學會 1992 농업경영정책연구 Vol.19 No.1

입력 설계기법을 이용한 유연구조물의 다중모드 제어기법 연구

황재혁,권오훈,이혜진 한국항공대학교 항공우주산업기술연구소 2002 航空宇宙産業技術硏究所 硏究誌 Vol.12 No.-

본 논문에서는 유연 구조물의 전류 진동을 제거하기 위한 방법으로 다중모드를 고려하여 제어하는 방법을 연구하고 실험을 하였다. 시간 영역에서의 ZVD-ZVD방법과 주파수 영역에서 근사 시간지연 기법을 시스템의 2차 모드까지 고려하여 입력을 설계하고, 그 설계된 입력을 실험에 적용하여 그 결과를 1차 모드만을 고려하였을 때와 비교하였다. 실험장치는 AC서보 모터에 허브를 달고, 그 허브에 유연한 구조물을 부착하여 구성하였다. 실험에 앞서 시뮬레이션을 위해 실험을 하고자 하는 모델을 모델링하고 운동방정식을 유도한 후, 그 구조물의 회전 시 발생하는 잔류진동을 제거하기 위해 다중모드를 고려하여 입력설계를 하였다. 그리고 시뮬레이션을 통해 얻어진 설계된 입력을 실제 실험장치를 통해 적용을 하였다. 제어 알고리즘은 C언어 프로그램을 이용하여 제작하였고, 실험장치에서 나온 결과값은 스트레인 게이지를 통해 얻어 그 결과를 나타내었다. 본 연구에서는 다중모드를 고려하여 입력을 설계한 경우, 1차 모드만을 제어하였을 때보다 유연구조물에 발생하는 잔류진동을 억제하는데 있어서 더 효과적인 방법임을 시뮬레이션과 실험을 통해 확인하였다. This paper includes our research and experiment on control method in consideration of multi mode to attenuate residual vibration of flexible structure. At first, Input has been shaped taking 2nd mode of system into consideration suing ZVD-ZVD method in a time domain and user selected Time-delay method in a frequency domain. Then, The Result has been obtained by appling the shaped input to the testing equipment. The comparison was made between the above acquired result and the result made when only 1st mode was considered. This paper confirms by simulation and experiment that application of the input shaped by taking multi mode into consideration is more effective method to attenuate residual vibration of flexible structure than when only 1st mode is controlled and No controlled.

광탄성 실험법에 의한 크랙을 가진 유한판의 정지구멍(Stop-Hole)의 최적크기에 관한 연구

권오성,황재석,서경덕 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Minimization of the stress concentration is very important in the life cycle extension of structures and machine parts, which have cracks or notches. Industrial field, stop-hole is drilled on the structures and machine parts to prevent the origination and propagation of cracks and to reduce the stress concentration. But, there is no a study on the optimal dimension of stop-hole for the various loading and geometrical conditions. Therefore, in this study, a study on the optimal dimension of stop-hole with various conditions is done by photoelastic experimental method.

신동맥 협착 정도에 따른 도플러 초음파 소견

박재성,이혜경,김대호,최득린,권귀향,홍현숙,임한혁,김기정 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

Renal artery stenosis is the one of causes of hypertension in a small percentage of all patients but is only anatomical cause that can be treated by means of surgery and percutanecous transluminal angioplasty. Angiography is the golden standard for diagnosis of renal artery stenosis, but a little invasive. With the advent of abdominal Doppler ultrasonography, renal artery stenosis could be diagnoed noninvasively. The experienced hands appears to be valuable in the doppler examination, ut some investigators consider it almost useless. The authors studied the effect of stenosis of renal artery on the downstream intrarenal blood flow, a snare was placed around renal artery in 12 rabbits and compressed to create stenosis while Doppler ultraonographic curve and flow index were obtained from main renal and interlobar arteries by means of placement of 10-MHz curved linear tranducer directly on the surface of kidney. The Doppler measurements were compared with the percentage of stenosis on angiograms. The results were as follow: 1. Ten satisfactory angiograms and Doppler ultrasonograms were obtained. 2. Three renal arteries were created stenosis below 70% (Group A), Seven were above 70% (Group B). 3. The ranges of RI (resistance index) were 0.61-0.86 (mean 0.78±0.154) at main renal arteries, 0.57-0.85 (mean 0.77±0.231) at interlobar artery. The range of PS (peak systolic velocity) were 13.1-28.8 (mean 21.65±4.445) m/sex at main renal artery, 5.2-18.1 (mean 11.74±4.095) m/sec at interlobar arteries. The RI of rabbits were higher than those of human (mean 0.58±0.05). 4. The range of RI in stenotic arteries of group B were 0.45-0.74 (mean 0.57±0.143) at main renal artery, 0.52-0.65 (mean 59±0.051) at interlobar arteries. The range of PS were 11.2-21.3 (mean 15.04±3.755) m/sec at main renal arte교, 5.7-11.3 (mean 8.24±2.056) at interlobar artery. The difference were statistical y significant (P=0.0302), but without remarkable change in group A. 5. Doppler ultrasonographic curve during progressive compression of renal artery showed dampened systolic waveform and diagonal upstroke at main renal arteries (71.4%) and interlobar arteries (85.7%) in group B, but without remarkable change in group A. 6. Release of the arterial compression caused higher than normal peak systolic velocity initially, at main renal arteries (42.9%) and interlobar arteries (28.6%). but the curve of all rabbits returned to normal within 5 minutes. The Doppler ultrasonographic index and curve were not changed on follow up Doppler ultrasonogram at 5 min. 10 min. 30 min. and 1 hour. The change of the systolic curves that compressed experimentally is identical to change in the pulsus tardus and parvus waveforms seen in both acute and chronic severe renal artery stenosis in humans, can helpul for the diagnosis of renal artery stenosis and the effects of treatment by percutaneous tranluminal angioplasty and surgery.

고감도 광섬유 압력 센서의 개발

李權鉉,趙慶宰 東新大學校 工業技術硏究所 1997 工業技術硏究 Vol.3 No.-

This paper presents the system demonstrator for an optical fiber sensor system developed as a technological evaluator suitable for generic sensing applications. The new type of fiber-optic sensor employed a diaphragm displacement transforms pressure into optical intensity. From this sensing technique, we can know the variation of source intensity, the loss of a optical fiber, and the reflectivity of the diaphragm surface. Experimental results are applied to the low-pressure transducer suitable for measuring miniature pressure.

Assessment of Effective Doses in the Radiation Field of Contaminated Ground Surface by Monte Carlo Simulation

Chang,Si-Young,Chang,Jai-Kwon,이재기 대한방사선 방어학회 2000 방사선방어학회지 Vol.24 No.4

지표에 오염된 방사성핵종의 단위방사능당 유효선량환산계수를 남성과 여성 인형모의 피폭체와 MCNP4A 코드를 이용하여 계산하였다. 모사실험은 40 keV에서 10 MeV 영역의 19개 단일 에너지에 대한 유효선량 계산을 수행하였다. 에너지에 따른 단위 선원강도에 대한 유효선량 E를 기존 연구자들의 결과물인 유효선량당량 H와 비교한 결과, 본 연구의 E값이 USEPA의 FGR에 주어진 H 값에 비해 30%의 편차를 보였다. 에너지와 유효선량의 관계를 polynomial fitting을 통해 구한 유효선량 감응함수는 다음과 같다. f(ε)[fSv ㎡]=0.0634+0.727ε-0.0520ε²+0.00247ε³, 여기서, ε는 감마선의 에너지(MeV)이다. 감응함수와 ICRP38의 방사성핵종 붕괴 자료를 이용하여 지표면과 공기 오염의 단위 방사능농도에 대한 유효선량환산계수를 계산한 후 DOSEFACTOR코드를 사용하여 계산한 베타선에 의한 피부선량을 합하여 90개의 중요 핵종들에 대한 환산계수를 평가하여 도표로 제시하였다. 기존 자료들과 비교들 통해 기존 환산계수를 사용할 경우 특히 저에너지 감마선이나 고에너지 베타선을 방출하는 핵종에 대해서 상당한 과소평가가 이루어질 수 있음을 확인할 수 있었다. Effective dose conversion coefficients from unit activity radionuclides contaminated on the ground surface were calculated by using MCNP4A code and male/female anthropomorhpic phantoms. The simulation calculations were made for 19 energy points in teh range of 40 keV to 10 MeV. The effective doses E resulting from unit source intensity for different energy were compared to the feeective dose equivalent H of previous studies. Our E values are lower by 30% at low energy than the H values given in the Federal Guidance Report of USEPA. The effective dose response functions derived by ploynomial fitting of the energy-effective dose relationship are as follows: f(ε)[fSv ㎡]=0.0634+0.727ε-0.0520ε²+0.00247ε³, where ε is the gamma energy in MeV. Using the response function and the radionuclide decay data given in ICRP 38, the effective dose conversion coefficients for unit activity contamination on the ground durface were calculated with addition of the skin dose contribution of beta particles determined by use of the DOSEFACTOR code. The conversion coefficients for 90 important radionuclides were evaluated and tabulated. Comparison with the existing data showed that a significant underestimates could be resulted when the old conversion coefficients were used, especially for the nuclides emitting low energy photons or high energy beta particles.