장기적 트립토판 결여식이 생쥐의 유해감각예민도에 미치는 영향

서영대,박제민,김명정,전명호,양구범,장세헌,강철중,김정태,김용식 대한생물치료정신의학회 2000 생물치료정신의학 Vol.6 No.1

The depressive patients can be divided into two subgroups by presence and absence of pain symptoms. Those without pain symptoms have blunted pain sensitivity whereas those with pain have normal range of pain sensitivity, and are clinically characterized by anxiety and irritability. The aim of the study is to test if these clinical profiles of the depressives with pain symptoms are related with reduced level of brain serotonin(5-HT). Forty four mice were randomly divided into two groups : one group to be bred with tryptophan free diet and the other with normal control diet, each for 4 weeks. Before the beginning of the breeding period, measured were locomotor activity by open field test, anxiety by elevated plus maze and nociceptive sensitivity by tail flick test, before and after forced swimming(FS). During each FS, duration of immobilization was also measured. The sable sets of measurements were repeated at the end of the breeding period. The brain 5-HT and 5-hydroxyindoleacetic acid(5-HIAA) were measured by high performance liquid chromatography. The results were as follows 1.Four weeks of tryptophan free diet reduced significantly body weight, brain weight, and levels of 5-HT and 5-HIAA in the whole brain. 2.Tryptophan depletion did not influence basal nociceptive sensitivity as measured by tail flick latency before FS. The normal blunting of the pain sensitivity induced by forced swimming was preserved in the tryptophan depleted group. 3.Tryptophan depletion did not influence general locomotor activity in open field. 4.Tryptophan depletion increased significantly time spent on the open arms at the elevated plus maze test done before FS. This anxiolytic-like effect was reduced by FS. 5.Tryptophan depletion did not influence duration of immobilization during FS. From these results, it is suggested that the genesis of the depression with pain symptoms is not medicated by quantitative reduction of brain serotonin

농촌경관 중요요소의 조작을 통한 경관평가 : 농촌 문화마을을 대상으로 The case of Rural Culture Village

서주환,심성보,전영임,박태희,조영배 경희대학교 부설 디자인연구원 2002 예술· 디자인학연구 Vol.5 No.1

This study does questionnaire over recognition of landscape, major landscape and impressive site in rural community, and research visual preference through precessing pictures with a computer about major landscape. The landscape with natural fabric generally harmonizing with background is high in preference. Also, though major landscape factors are similar, preference is different according to shape, size, quality and color.

16 Bit Microprocessor를 이용한 유도전동기의 최적제어에 관한 연구

徐基永,金兌孝,權純杰,申千雨 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-

本 論文은 16 bit one-chip 마이크로프로세서를 이용하여 正弦波 變調 最適 PWM 制御方式을 채택한 인버어터에 관한 연구이다. 3相 誘導電動機의 可變速 運轉에서 스위칭시에 발생되는 損失의 증가 및 效率 저하의 원인이 되는 高周波成分과 이를 除去하기 위한 알고리즘을 해석하고,이 알고리즘을 실현하기 위해 制御用 16 bit one-chip 마이크로프로세서로 구성되는 hardware시스템을 設計함으로써 종래의 마이크로프로세서로 실현 불가능했던 on-line 계산 및 real-time 실현을 가능하게 하였다.이 시스템을 最適으로 制御하고 計算하기 위한 software를 개발하고,아울러 외부 시스템과 RS-232C로 통신할 수 있는 기능을 첨부하여 host computer에서 remote control이 가능하게 함으로써 MAP(manufacture automation protocol)에 대처할 수 있게 하였다. hardware 및 software의 設計에 따라 제작된 시스템의 高주波 制御效果를 확인하기 위한 實驗에서 現在 産業界에서 사용되고 있는 우수한 성능을 가진 것으로 알려진 特定모델을 선정하여 이와 比較 檢討하였다. 그 結果 인버어터의 基本波成分과 각 高調波成分의 스펙트럼이 出力周波數에 따라 다소의 차이가 있었으나, 測定 周波數의 전체범위에서 比較된 특정모델보다 우수한 特性을 얻을 수 있었다. This paper describes an inverter adopting an optimal sinusoidal waveform modulation PWM control method using 16 bit one-chip microprocessor. In variable speed operation of three-phase induction motor, a large number of harmonic components are included in switching waveform and cause decrement of efficiency. We analyzed some properties of each harmonic component and an algorithm for elimination of harmonics. In order to implement the algorithm, we designed a hardware system composed of special purpose 16 bit one-chip microprocessor. But it has been impossible to get a real-time computation. We compared and examined the effect of harmonics between the designed inverter and the commercial inverter. It was found that the designed inverter had more excellent suppression of harmonics than the selected commercial inverter over a range of all measured frequencies.

비만 여성을 대상으로 한 해조류 추출물의 국부처치와 운동 병행을 통한 지방분해 효과의 임상적 검정

서태수,이인숙,변재철,김규호,박승한,김유영,김상국,김현정,김상기,신동철,성미영,박종석,김종기,박언휘 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3

This study was carried out to test the body fat breakdown during topical seaweed extract treatment and in combination with the aerobic exercise. Of 20 female obesity subjects, ten treated a cream types of seaweed extract(control group) and ten treated a placebo cream(placebo group). Topical treatment of each sample was designed for 4 weeks, and treated with 2 times a day about 10ml on the abdomen and the thigh, respectively. All subjects were participated aerobic dance half hour a day and four times a week. After 4 weeks of topical treatment and exercise, they were measured body fat, skinfold thickness, body circumference. Then venous blood samples were taken and analyzed blood cells, serum enzymes, and serum lipids. There were reduction of body weight, % of body fat, antebrachium, brachium, chest, waist, thigh circumference and abdomen thickness between pre and post treatment in both group. Especially, body weight and % of body fat significantly reduced in the subjects treating the seaweed extract than those treating the placebo. There were significant decrement in total cholesterol and LDL whereas increment in HDL and TBIL in the control group, but no significant difference in the placebo group. In conclusion, there were 7.6% of body fat reduction during 4 weeks of aerobic exercise and 21% of body fat reducement in combination of topical seaweed treatment and exercise, respectively. These results suggest that the topical treatment of seaweed extract should be very effective for fat breakdown. Especially, the body fat breakdown maximized in the combination with the topical seaweed extracts treatment and the aerobic exercise.

갑상선 종양의 Flow Cytometric DNA Ploidy 분석

김영태,김진만,서광선,배진선 대한병리학회 1995 Journal of Pathology and Translational Medicine Vol.29 No.2

점유후 평가(POE)를 통한 대학 도서관 계획에 관한 연구 : 성균관대학교 중앙도서관 이용의 행태적 측면 분석을 중심으로 Analysis of the User Behavior in Sung Kyun Kwan University Central Library

서기영,김태훈 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.1

University Library is one of the most important facilities in the campus core. It is not only a place for studying and getting informations but also a central space where various campus life related activities occur. Because of its very complicated functions, designing a large scale library is not an easy task at all to be a successful one. In this study, many efforts have been made through the Post-Occupancy Evaluation process of the Sung Kyun Kwan University Central Library to define the problems of the library and to provide the properly generalized solutions that would be helpful when planning the similar projects.

高溫下의 304스테인레스鋼의 유지시간에 따른 表面균열成長에 관한 연구

徐昌敏,權永斗,權寧泰 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.15 No.-

This paper deals with the hold-time effects on the surface crack growth characteristics of machine element operating at high temperature. Creep-fatigue tests have been carried out at elevated temperatures of 538℃, 593℃ and 650℃ with holding times of 1 and 10 minutes at each temperature level in air. The test specimen is a plate type of type 304 stainless steel with an artificial defect that might exist in real structures. creep-fatigue data obtained from above experiments are compared with creep and fatigue date of the previous researches. The results obtained in the view-points of both strength of materials and fracture mechanics, are as follows: At same temperature level, the longer the hold-time, the higher the cycle basis crack growth rate, d(2ℓ)/dN, for a given maximum stress intensity factor level, But the longer the hold-time, the lower the time basis crack growth rate, d(2ℓ)/dt. It is notable that at high environment temperature the elongation decreases, but the crack center opening displacement increases.

우리나라 시외통신망의 과부하 통화량 관리 방안에 관한 연구

서영태,박상희 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2

When the traffic performance begins to decline, to assure the adequate call processing of the toll network, efficient management of overload traffic is needed. In this paper, the generated patterns and managing methods of overload traffic in Korean toll network have been studied and the traffic performance has been analyzed by the result of applying overload traffic managing methods and compared with a traffic performance without this method. When the overload traffic managing method, the obtained results are as follows. 1. When the busy traffic performance is 700,000 houses, good processing of the traffic performance over 95% is obtained, which is the operation target of an automatic trunk call operator. 2. If the busy traffic performance increases above 700,000 houses, the trunk call performance goes down abruptly. 3. When the number of trunk call is 700,000, 665,000 calls are connected and 35,000 calls are not connected.

폐콘크리트 재활용을 위한 재생골재 혼합에 따른 강도특성분석

조규태,서영찬 漢陽大學校 工學技術硏究所 2002 工學技術論文集 Vol.11 No.-

본 연구에서는 최근들어 다량으로 증가되고 있는 폐콘크리트의 재활용 여부를 판단하기 위해서 천연골재에 대한 재생골재를 중량비로 0%, 30%, 50%, 70%, 100%비율로 혼합한 재생콘크리트의 강도특성을 비교하였다. 재생골재 각 조합의 물성시험을 통해 골재의 물성치를 확인한 다음 콘크리트의 배합설계를 하였다. 배합설계는 상대비교를 위해 단위골재량 값만을 변화시키고 다른조건들은 동일하게 하였다.또한 플라이애쉬, 고성능 감수제를 첨가한 혼합물의 내구성과 작업성 문제에 대해서 고찰하였다. 재생골재의 물리적 특성 시험결과 재생굵은골재와 재생잔골재 모든 조합에서 비중은 KS의 1종 재생골재,흡수율은 2종 재생골재 기준을 만족하였으며, 특히 재생골재 대체율 50%까지는 자연골재와 동일한 물성값이 나타났다. 기존의 폐콘크리트는 대지조성재, 기초 매립재등으로 이용하고 있으나 본 시험을 통해 재생골재를 사용한 콘크리트의 적용이 도로포장재료로서 가능하다는 결론을 얻었다. The strength characteristics of recycled concrete is compared to study the feasibility of the recycled aggregate made of the scrapped dump cement concrete for five compound aggregate types consisted of natural aggregate and recycled aggregate as the ratio of weight(0%, 30%, 50%, 70%, 100%). First of all, the physical characteristics of recycled aggregate compounds were tested and the mix design was conducted. Every factors, except the unit aggregate amount, were fixed for the relative comparison. Fly-ash and the super water reducing agent were added to the recycled concrete to ensure the workability. The results of test, the recycled coarse aggregate, recycled fine aggregate and all compounds of recycled aggregate were satisfied with the specification(KS) of the type Ⅰ recycled aggregate in terms of the specific gravity, and the type Ⅱ specification in terms of the absorption. Especially, up to the maximum 50% replacement of recycled aggregate, the properties were equal to natural aggregate. Although most of recycled concrete were used for the land fill, this study showed the feasibility of recycled aggregate as the concrete mix.

학과평가 및 교원업적평가 운영방안

최병태,서승교,박영순,이택영 대구산업정보대학 2000 논문집 Vol.14 No.2