기계 병진 시스템의 동특성 연구

이동하,김택현,정상화 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

The mechanical translation system is made up of springs, masses and a dashpot. This precise piece of equipment is controlled electro-mechanically by a motor and operating program. The control strategy of the system can be changed by spring stiffness, change of mass, and the damping coefficient of the dashpot. It can be modeled as a rigid body, and also finds broad application in such diverse fields as machine tools, the cruise control system in automobiles, and control in the attitude and gimbal of spacecraft. This system proves the necessity and effect of a closed loop control. In this paper, PD control experiments were implemented for the mechanical translation system. When the notch filter was added on the PD controller, we compared the response characteristics of the two systems. Finally, we should improve the response characteristics of the mechanical translation system which are rising time, settling time, steady state error, and overshoot.

콩 종간교잡에서 주요형질의 유전분석

이정동,권택화,조호영,황영현 慶北大學校農業科學技術硏究所 2002 慶北大農學誌 Vol.20 No.-

재배종과 야생종의 인공교잡 분리세대에서 주요형질들의 변이와 유전력을 조사하여 야생종을 이용한 콩 품종육성의 기초자료를 얻고자 수행한 결과를 요약하면 다음과 같다. 두 인공교배의 F_2 집단에서 100립중을 제외한 나머지 조사 형질들은 초원분리를 보였다. F_1과 F_2의 평균 개화일수는 양친의 중간정도로 정규 분포를 보였다. 백립중의 F_1 평균은 은하콩, 소백나물콩 두 조합 각각6.5, 5.7g으로 소립종 쪽으로 치우친 정규분포를 보였다. F_2의 평균수량은 양친의 중간정도이었다. F_1의 덩굴성은 두 조합 각각 6.4, 6.6이었으며 F_2 평균은 은하콩 조합이 6.0으로 덩굴성 쪽으로 치우쳐 덩굴성이 부분적인 우성으로 보였으나, 소백나물콩 조합에서는 4.6으로 은하콩과는 다른 결과를 보였다. 경장, 개회일수, 개체당 협수, 수량, 도복, 덩굴성 등은 높은 광의의 유전력을 보였으며 100립중은 협의의 유전력이 은하콩 조합에서 52.3%, 소백나물콩 조합에서 65.6%로 평가되어 초기세대에서의 선발이 가능한 것으로 나타났다. This study was conducted to obtain the information of varietal development using wild soybean through investigation of variation and heredity of major agronomic characters in F_2 generation of interspecific cross between Glycine max and G. soja. In segregating populations of two crosses, all characters observed except 100-seed weight showed transgressive segregation. Days to flowering showed normal distribution; mean days to flowering in F_1 and F_2 was approximately mean of parent. Mean of F_1 for 100-seed weight was 6.2g and 5.7g for Eunhakong/KLG10084 and Sobaegnamulkong/KLG10084, respectively, which were somewhat skewed distribution to small seeded parent. Mean of F_2 was about mean of two parents. Degree of vine was 6.4 and 5.7 in F_1 for two crosses but it was 6.0 in F_2 for Eunhakong/KLG10084, which revealed the degree of vine as partial dominance while 4.6 for Sobasgnamulkong/KLG10084, somewhat different results from the previous cross. Broad-sense heritability(h^2B) for plant height, days to flowering, pods per plant, seed yield, and degree of vine was comparatively high and narrow-sense heritability(h^2N) for 100-seed weight which is the most important character in the development of small seed-size sprout soybean was 52.3% and 65.6% for Eunhakong/KLG10084 and Sobaegnamulkong/KLG10084, respectively, which indicated that selection for the character in early generation was possible.

노후공동주택의 거주성능평가요소에 관한 연구

이병태,현택수,정의용 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2

This study aims to propose the comprehensive evaluation of Performance multi-family housing. Most of the existing studies for the reproduction have evaluated the deterioration by the safety of structure. Therefore those pass over the functional factors which is important for the evaluation of residential qualities. This study represents that the reproduction renovation should not be secured the safety of structure but established the quality of life. And questionnaire asking expert's opinion also supplemented. As a result, the item for examination and the weight for evaluation are suggested in functional deterioration. The results of this study are summarized as follows: 1. Existent redevelopment criteria are not appropriate to decide the environmental comfort, the vital function of housing and the residential management finance. 2. The future criteria have to evaluate the existing environmental comfort, be reconstructed to put first general deterioration. 3. Evaluation elements was extracted throughout the document research. evaluation elements analysis system was separated in residential area, suburb of dwellings, community, and housing complexity environmental assesment. 4. Each category of influence ratio was extracted to assess total deterioration throughout the expert question survey. 5. Each category analysed : ① 0~30%: function is good (unnecessary to improve) ② 31~40%: average (necessary of partial improvement) ③ 41~59%: bad (necessary of total improvement) ④ 60~100%: the worst (unable to improve throughout the repair)

주파수 해석기와 M-mode 영상을 갖는 펄스 도플러 정치의 개발에 관한 연구

정택섭,이행세,김영길 亞洲大學校 1987 論文集 Vol.10 No.-

We have developed a Ultra Sound Pulsed Doppler System with two-dimensional M-mode image and Spectrum analyzer. The image of the M-mode is composed of time depth axes. The Spectrum analyzer shows the spectrum of Doppler signal which represents the velocity component of time dependent blood-flow behavior. The spectrogram using Spectrum analyzer is composed of frequency and amplitude axes. The outputs of the system are audio signals, velocity curves, velocity profiles, M-mode images and spectrogram.

裁定價格決定模型과 資本資産價格決定模型의 比較

李正道,孔丁澤 慶北大學校 1986 論文集 Vol.42 No.-

1. Although the CAPM has been predominant in empirical work over the past twenty years and is the basis of modern portflio theory, accumulating research has increasingly cast doubts on its ability to explain the empirical constellation of asset return. In this situation, APM is an alternative model which overcomes the critical points of the CAPM. 2. The purpose of this paper is to systemize the theoretical structure of APM and to compare the APM and the CAPM in the frame work of mircroeconomic equilibrium theory. 3. Recent empirical studies on the APM has emphasied the number of significant factors which explain the covariance matrix of returns. As result, the APM can have the different theoretical structure from that of the CAPM and provide the empirical testable asset pricing model. 4. Our conclusion is that the APM performs well under empirical scrutiny and that it should be considered as a reasonable model for explaining the cross-sectional variation in average asset return. So it is reasonable that alloting more weight in APM than CAPM in finding the criterion of decision making under uncertainty.

방사선 치료를 받는 암 환자들의 사회적 지지와 삶의 질과의 관계

정주희,류소연,윤혜은,남택근,오윤경,안현옥,박계남,이영선 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2

Objective : This study was performed to investigate the relationship between social support and quality of life among cancer patients receiving radiation therapy. Matehals and Methods : The data were collected from 98 patients, who were receiving radiation therapy at two university hospitals located in GwangUJu, used by structured questionnaire. For statistical analyses of the association between quality of life and various characteristics, data were analyzed using t-test, ANOVA, Pearson 's correlation, and multiple regression analysis. Results: 1. There were 56(57.1%) males and 42(42.9%) females. Age ranged from 21 to 82 years. The primary sites of cancer were gastrointestinal tract (24.5%), lung (23.5%), breast (21.4%), and head and neck (11.2%) in order. 2. The mean scores of social, family, and medical support were 4.30 0.58, 4.49 0.78, 4.11 0.65, respectively. The score of quality of life was 5.83 1.63 (range: 1.95 ~ 9.05). 3. An analysis of the association between several factors of patients and quality of life showed that the statistically significant factors were age, the presence of distant metastasis, family support, medical support and social support. 4. As a result of the multiple regression analysis, only social support was significant (β=0.932, P=0.02) with quality of life, but age and presence of distant metastasis were not significant. Conclusion : This suggests that quality of life in cancer patients could be improved by strengthening the social support which consists of family and medical support. Further study would be necessary to evaluate separately several aspects of quality of life among cancer patients.

정상 한국인에서 CRH, GHRH와 TRH를 이용한 복합뇌하수체 자극시험에 대한 성별 연령별 반응

이상훈,김성운,고관표,오승준,우정택,양인명,김진우,김영설 대한내분비학회 2004 Endocrinology and metabolism Vol.19 No.1

연구배경: 인슐린을 대신하여 부신피질 자극호르몬 방출호르몬 (CRH)과 성장호르몬 방출호르몬 (GHRH)으로 복합뇌하수체 자극검사가 시행되고 있으나, 한국인에 있어서 정상 반응치에 관한 연구가 없고, 각각의 자극 호르몬의 연령이나 성별에 대한 반응의 차이는 보고되었지만 복합 자극검사에서의 연령별 성별 차이가 확립되지 않아 이를 알아보고자 본 연구를 시행하였다. 방법: 정상인 50대 남자 7명, 20대 남자 7명과 50대 여자 7명, 20대 여자 7명을 대상으로 CRH 100㎍,GnRH 100㎍, GHRH 100㎍, TRH 200㎍을 순서대로 동시에 정맥주사한 후 ACTH, GH, TSH, PRL, LH, FSH를 15∼30분 간격으로 2시간 동안 측정하였다. 결과: 1) TSH, PRL, LH의 분비 정도는 20대 남성과 50대 남성간의 유의한 차이가 관찰되지 않았으나, ACTH와 FSH는 50대 남성에서, GH는 20대 남성에서 통계학적으로 유의하게 높게 나타났다. 2) 20대 여성과 50대 여성을 비교했을 때, FSH만 50대 여성에서 통계학적으로 유의하게 높았고, 나머지 호르몬들의 결과에서는 통계학적으로 유의한 차이는 없었다. 3) 50대군에서 GH와 LH는 남녀간의 유의한 차이를 보이지 않았으나, ACTH는 남성에서 높게 나타났으며, Prolactin, FSH, TSH는 여성에서 통계학적으로 의미 있게 높았다. 결론: 연령, 성별과 월경주기 등에 따른 한국인의 복합뇌하수체 반응에 관한 더 자세한 연구가 요망된다. Backgroud: It has been already known that each trophic hormone in combined pituitary responsiveness according to gender and age brings about variable response, but in Korea, there has been no actual data. In this study, in order to assess the pituitary responsiveness, a combined pituitary stimulation test was performed in Korean subjects with the variation in CRH, GHRH, GnRH, and TRH according to their age and gender. Were these the variables that were changed according to age and gender? Clarify that. Also, it might be good to write out the abbreviations.) Method: Fourteen physically and mentally healthy male subjects and fourteen female subjects, also physically and mentally healthy, underwent the combined anterior pituitary stimulation test by CRH, GHRH, LHRH, and TRH. Each gender group was divided further into young (meanSE; male: 231, female: 221) and old (mean; male: 513, female: 522) groups. Results: There were significant differences between the gender and age groups. The Peak GH level and maximal GH increment were significantly increased in young men compared to old men. The Peak ACTH level and maximal ACTH increment were significantly increased in old men as opposed to young men. The Peak PRL level, maximal PRL increment, Peak TSH level, and maximal TSH increment were significantly increased in old women compared to old men. The Peak FSH level was significantly increased in the two old groups compared to the young groups, which showed independence in gender, and the maximal FSH increment was significantly increased in old men when compared with the young men. Conclusion: These results show that in order to for accurate interpretation of the response from the combined pituitary stimulation test, it is necessary to consider age and gender of the subjects. We suggest response values of the combined pituitary stimulation test in terms of age and gender in healthy Korean subjects (J Kor Soc Endocrinol 19:24∼32, 2004).

MPC 11 cell에 TPA 처리로 유도되는 DNA 결합 단백질의 특성

임계택,이정채 全南大學校 農業科學技術硏究所 1996 農業科學技術硏究 Vol.31 No.-

Vimentin의 전사인자(transcriptional factor)에 대한 기초자료로소 그 발현정도를 알아보기 위해 MPC11 cell에 Phorbol ester, 12-0-tetradecanoy phorbol 13-acetate (TPA)를 처리한 다음 DNA 결합 단백질을 세포질과 핵으로부터 분리하여 추출 한 후 gel mobility shift assay 방법으로서 그 성격을 연구했다. TPA를 처리한 MPC11 cell에서 처리 후 3시간에 단백질이 발현되었으며 그 단백질은 vimentin으로 추측된다. 한편 DNA 결합 단백질은 NF1과 TFN보다는 AP2에 대해 더 큰 결합력을 가지고 있는데 이는 AP2가 vimentin 발현과정에 있어 어떤 specific promotor element와 상호작용을 하는 것으로 여겨지며, TPA 의 처리에 의해서 vimentin의 발현이 촉진됨을 추측할 수 있었다.

급수시스템에서 동관부식에 대한 음이온물질의 영향

윤혜정,서규태,이택순 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-

The corrosion rate of copper pipe used in distribution system was studied in presence of chloride, sulfate and fluoride ions, respectively. It was compared with test results using mixtures of sulfate and chloride at concentrations similar to those of tap water in Gyeongnam area. The corrosion rate of copper pipe was higher in the presence of sulfate than chloride showing two fold higher rate. In contrast copper concentration in synthetic water containing chloride was rather higher than in the presence sulfate. Fluoride was generally considered less aggressive toward corrosion of pipes, but corrosion rate and the concentration of copper were relatively large values. During potentiostatic anodic polarisation a relatively large current was producted in the chloride containing solutions.

PD제어와 LQR을 이용한 병진 시스템의 제어특성 연구

김택현,정상화,이동하 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.5

The translation system is made up of springs, masses and a dashpot. This precise piece of equipment is controlled electro-mechanically by a motor and operating program. The control strategy of the system can be changed by spring stiffness, change of mass, and the damping coefficient of the dashpot. This system proves the necessity and effect of a closed loop control. In this paper, PD control experiments were implemented for the translation system. When the notch filter was added on the PD controller, we compared the response characteristics of the two systems. The state feedback controller minimized scalar control gains and the resulting response characteristics of the system were studied using the LQR design. Finally, we improved the response characteristics of the translation system which are rising time, settling time, steady state error, and overshoot. LQR was better as compared with PD control.