춘천시의 지하 저장 탱크의 예비적 위해성 평가를 위한 설치 현황 분석 및 지리정보시스템의 적용

김준현,한영한,이종춘,권영성,이광연 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

In this study, the preliminary risk assessment for the underground storage tanks(UST) in Chunchon city was implemented using the geographical information system(GIS). The estimation variables, such as the installation year, storage capacity, the distances from streams, and from groundwater pumping wells, were selected to estimate the relative risk levels. The weighting factors were given to all the estimation variables. Cumulative scores were induced by the combination of al1 the scores of the corresponding variables using the buffering technique and the overlay analysis in ArcView. Using the these process, the relative risk level of each UST was estimated. Some sites in this study are simplified and reduced because the number of useable data are limited or too enormous. Thus the selection of the comprehensive estimation variables and the proper weighting values are required for the future study. The methodology in this study could be served not only for the preliminary risk assessment of UST but also for the selection of the proper location of new and old UST. And, it can be used for the effective management system of UST.

충남대학교 학술림 산책로 훼손실태 및 관리방안에 관한 연구

이준우,김명준,최윤호,전용준,오도교,김민호,이소연,이경형 충남대학교 농업과학연구소 2004 농업과학연구 Vol.31 No.2

This study concentrates an the trail of the CNU(Chungnam National University) forest. The amount of use and the pattern of damage are considered, as well as the extent of environmental damage. Finally, some managerial strategies are proposed in connection with sustainable maintenance. The trail of the university forest is composed of three sections; one is the neighborhood park and the Institute of Information Technology/Communications, the second is the Institute of Information Technology/Communications and the Dormitory, and the third section is the Dormitory and the Foreign prof's Apt. The total length of the trail is 2.6km. The daily amount of use is 1,269 visitors per day. The amount of using increased three times the amount of that in 1998. This study shows the pattern of damage of the trail in the order of root-exposure, widening, rock-exposure, deepening and the divergence in the frequency of occurrence of all these factors. Environmental damage is also graded thus: grade 3 is 27.4m, grade 4 is 0.8m, grade 5 is 1.5m, and grade 6 is 0.2m. Accordingly, some managerial strategies were proposed in connection with the sustainable trail maintenance.

Purge & Trap-GC를 이용한 의약품 필름코팅 정제 중 잔류용제에 관한 연구

장준식,이명자,소유섭,문춘선,이주헌,박희라,김진숙,강경모,이선옥,방성연,유미자,유문균,금오성,이병욱 식품의약품안전청 2000 식품의약품안전청 연보 Vol.4 No.-

의약품은 약물을 생체에 적풋하기 위하여 유효성분의 효과가 언제나 일정하게 확보되고 사응에 편리하도록 만들어지는 것이므로 유효썽분 이외에 약효에 영향을 주지 않는 성분이 첨가되는 경운가 많다. 이 때 사용되는 용매들은 제피의 광택 및 건쪼시간의 단축 등을 위하여 휘발점이 낮을 용매들이 주로 사용되어진다. 본 연구는 의약품 필름코팅정제 중 잔류용매 4종(chlorofonr benzen, trichloro ethylen, 1,4-dioxane)에 대한 변형된 pirge & trap-GC 장치를 이용한 동시분석방법을 개발하였으며, 각 표준품의 RSD 값은 chloroform 3.03%, benzen 3.17%, trichloroethylen 3.69% and 1,4-dioxane 3.41%였다. 또한 시중 유통중인 의약품 50종에 대하여 잔류웅매 양을 측정하였으며, 검출되는 잔류용매는 한 건도 없었다. This study nras carried out to develope the analytical method for the mixture of chlorefonn, benzen, trichloroethylen and 1,4-dioxane simultaneously and determine the remainingorgauic solvents in coating tablets by Purge & Trap-GC. The results were as follouFs ; 1. Chloroform, benzen, trio:tloroethylen and 1,4-dioxane separated by tenax #5 trap by HP-624GC column by terrlperature programming. The peaks were separated completely at retentiontime of 6.88min for chloroform, 8.21min for benzen, 10.38miu for trichloroethylen and 11.95minfor 1,4-dioxane. 2. Standard RSD were individually chloroform 3.03%, benzen 3.17%, trichloroethylen 3.69%and 1,4-diorane 3.41%. 3. 60 samples were not detrcted chloroform, benzen, trichloroethylen and 1,4-dioxane.

폴리(스타이렌-b-아이소부틸렌-b-스타이렌) 삼블록 공중합체 아이오노머의 기계적인 성질

나연화,김희석,김준섭,유지강,박기주,이영관 조선대학교 생산기술연구소 1998 生産技術硏究 Vol.20 No.2

The dynamic mechanical properties of poly(styrene-b-isobutylene-b-styrene) and its sulfonated ionomers were investigated. The triblock copolymer showed a tan δ peak at ca. -25℃, which is ascribed to the T_(g) of polyisobutylene blocks. The copolymer also showed a shoulder on a tan δ curve at ca. 50℃, which is probably associated with crystallization and/or melting of the crystalline polyisobutylene blocks. Above 100℃, the copolymer started to flow. In the cases of ionomers, well developed rubbery plateaus, extended to ca. 150-160℃, were seen in modulus-temperature plots. A tan δ peak for the T_(g) of the polyisobutylene blocks and a shoulder peak were also observed for the tetramethylammonia neutralized sulfonated ionomer. However, the shoulder peak became smaller and shifted to low temperatures, which implies that the ionic interactions in this system reduces the ability of crystallization or/and melting of the polyisobutylene blocks. For the K neutralized ionomer sample, only a tanδ peak for the T_(g) of the isobutylene blocks was seen. This different result in these two ionomers is believed to be due to the difference in the strength of ionic interactions.

Pile Driving에 의한 지반진동 측정 및 진동 영향 평가

박선주,박연수,강성후 東新大學校 工業技術硏究所 1998 工業技術硏究 Vol.4 No.-

In this paper, the ground vibrations have been measured. These were induced during pile driving using vibratory hammer at construction field of the 1st subway line in Gwangju. The measurement of ground vibrations was divided by four step to pile driving processing, auger in reclaimed layer, casing, auger in soft rock layer and H-pile driving. The measured data were analyzed by reliability index to determination the vibration equations and the allowable isolate distance for vibration criteria. These equations and allowable isolate distance were suggested with division of ultimate limit state(β=0), serviceability limit state(β=1.28), safety state(β=3), respectively. These equations can be used to predict the peak vibration values where soil conditions are similar to this test site. From this paper, analysis method for vibrations inference using reliability index was estabilished and the attenuation of the ground vibration induced during pile driving using vibratory hammer(T4W) are suggested.

測定用 寫眞과 非測定用 寫眞의 組合에 依한 圓筒形 構造物의 全面解析

姜準默,裵淵晟,李鎭德 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2

본 연구는 C.R.P.에서 측정용과 비측정용 사진을 조합하여 원통형 구조물의 전면해석을 시도하고 그의 정확도를 실험적으로 구명한 것이다. 대상물 주위에 원형의 노출 network을 구성하고 측정용과 비측정용 카메라를 이용하여 multi-station photography를 실시하였다. strip과 block을 bundle조정에 의하여 촬영 거리별로 측정용 사진과 비측정용 사진으로 각각 해석하고, 정확도를 비교함으로써 비측정용 카메라의 적용가능성을 입증하였다. 또한 원통형 구조물의 全面을 단시간에 해석하기 위하여 측정용 사진과 비측정용 사진의 조합해석을 시도하고 이의 효용성을 제시하였다. The objective of this study is to suggest the ways of analyzing the entrire-area of cylindrical structure with combination of metric and non-metric photos in C.R.P. and also investigate characteristics of accuracies. For it, circular exposure network was disigned and multi-station photography was executed with metric and non-metric camera respectively. Bundle adjustment was performed to compute three dimensional coordinates of unknown points. By comparing accuracies of results analyzed with metric photos and non-metric photos, we proved applicability of non-metric camera to purpose of measurement. Also, by positioning through combining metric and non-metric pothos, we proved the effectiveness of it and found out characteristics of accuracy of it.

神門穴 鍼刺戟이 母性分離 스트레스로 야기된 攝食 障碍와 시상하부 neuropeptide Y 발현에 미치는 영향

박히준,류연희,홍미숙,김승태,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-

Objective : The purpose of this study is to find out the effect of acupuncture at HT7(Shinmun) on the feeding behavior and hypothalamic neuropeptide Y(NPY) expression in the maternally separated rat pups. Methods : To show the effect of acupuncture, we performed maternal separation(MS) for 7 days beginning on postnatal day 14, and observed body weight, food intake, and NPY immunoreactivity in the paraventricular nucleus(PVN) of hypothalamus after acupuncturing at HT7, the end of the transverse crease of the ulnar wrist of the forepaw. Results : MS induced a significant decreases in body weight and food intake, while acupuncture treatment at acupoint HT7 showed much more improvement in those evaluations. NPY-immunoreactivity in area PVN were decreased in the MS group, but significantly increased in the HT7 group. Conclusions : These findings suggest that acupuncture has an effect on the feeding disorders caused by MS, possibly by modulating NPY expression in the PVN.

포타슘 술포네이트 폴리스타이렌 아이오노머의 기계적인 성질에 미치는 Crown ether의 영향

나연화,조규성,이법원,김준섭,유지강,박기주 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1

The effects of crown ether on the dynamic mechanical properties of potassium sulfonated polystyrene ionomer were investigated. As expected, it was found that when crown ether molecules were added to the ionomer, the crown ether molecules interacted with K^(+) cations and weakened the ionic interaction between K^(+)/sulfonate ion pairs of the ionomer significantly. Thus, no multiplets were present, and, in turn, no clustering was found. When the ether was added to interact with 50% of K^(+) cations, weak clustering was observed: the clustering was slightly stronger than that of a 50% neutralized ionomer. From this result, it was speculated that in the 50% neutralized sample H^(+) ⇔ K^(+) cation exchange occurs rapidly between -SO₃H and -S0₃K groups in multiplets. which weakens ionic interactions. In the 50% crown ether-added sample, however, -S0₃- group, instead of -S0₃H, is present, and thus no cation exchange is expected to occur.

충남대학교 연습림의 산책로 훼손에 관한 연구

이준우,박범진,최윤호 충남대학교 농업과학연구소 1998 농업과학연구 Vol.25 No.1

Three major trails of campus forest in Chungnam National University were selected to investigate the use impacts on environmental deterioration of trail according to the different amount of use. Rook-exposed, root-exposed, deepening, widening, diverged points as the deterioration types of trail which were surveyed at total of 92 points in major trail of campus forest in Chungnam National University. Major deterioration types of trail were widening, rock-exposure, root-exposure, in order of frequency. And trail conditions(trail slope and maximum depth) of deteriorated points were significantly different from those of non-deteriorated points.

Blumlein 전송회로에 의해 선전리되는 질소레이저의 동작특성 연구

양준묵,추한태,이봉연,이치원 충남대학교 1990 忠南科學硏究誌 Vol.17 No.2

The design and construction of nitrogen laser preionized with a Blumlein transmission line circuit is described. For the power supply, we have used a pulse type high voltage power source that can be produce 10 joule energy in a pulse. The condition of maximum output power is observed at N_2 gas pressure of 100 torr, spark gap distance of 6.0 mm, repetition rate of 30Hz with preionization, and the stability increases by 0.7%. The maximum increment of output power is achieved at pressure of 200 torr when preionization is used. Finally we can increase the output power by approximately 60% by using this work, and the E/P value is 133 V㎝^(-1) torr^(-1).