동진강 수계 농업용수 수질평가

한수곤,최정식,문영훈,엄미정,김갑철 한국환경농학회 2000 한국환경농학회지 Vol.19 No.2

동진강 수계의 수질현황을 파악하기 1994∼1998년 까지 4∼9월에 월 1회에 걸쳐 5개년간 조사한 결과를 요약하면 다음과 같다. 월별로는 빗물에 의한 희석효과로 7, 8월에 수질이 가장 양호하였으며, 4월이 다소 불량하였으나 수도생육 피해 한계농도에는 미치지 못하는 수준이었다. 지점별 수질현황은 생활하수 유입지인 정읍천과 지천의 폭이 좁은 원평천의 무기성분 함량이 높았으며 동진천 상류지역에서 가장 양호하였다. 연도별 현황은 '94년 이후 '95년까지는 수질이 악화되는 경향을 보였으나 '95년 이후로는 각 성분 함량이 낮았지는 등 점점 양호해지고 있으며 COD함량으로 볼 때 특히, 정읍천의 수질이 개선되고 있음을 알 수 있었다. 양이온과 음이온의 총당량온 4월에 가장 높았고 7, 8월에 가장 낮았으며 양이온/음이온의 당량비는 5월에 높았고 7월이 가장 낮았으며 지점에 따라서는 총당량은 정읍천, 원평천, 동진천 하류, 중류, 상류의 순위였으며 양이온/음이온 총당량 비율은 원평천이 상대적으로 작은 수치를 보였지만 지역간 큰 차이는 보이지 않았다. 수질 중 각 성분 상호간의 상관관계를 보면, 대개의 성분 상호간에 유의성이 높게 나타났으나, NO₄^--N는 대개의 성분과 유의성이 없었고, PO₄^(3-)-P도 COD, NH₄^+-N, NO₃^--N, SO₄^(2-)과는 유의성을 보이지 않았다. This study was conducted to monitor the irrigation water qualities along Dong-Jin river watershed. The water quality was surveyed at 6 sites from April to september during 1994∼1998. And the results were as follows : In July and August, water quality was better than that of any other months due to dilution with rainwater. Whereas, it became worse in April but it involved lower contents than limitted contents affected to the crop damage. Content of inorganic components was higher at Jeong-up and Won-pyeong stream. The reason for it that Jeong-up stream was deteriorated with sewage water from Jeong-up city, and Won-pyeong stream has narrow width. Water quality in upstream of Dong-Jin river, was evaluated best conditions in all sampling sites. For investigated period, water quality got worse from 1994 to 1995 but it was getting better to 1998 after 1995, especially at Jeong-up stream. The total equivalent of cation and anion was the highest at April through all months and at Jeong-up stream in sampling sites. Equivalent ratio of cation to anions(∑C/∑A) was higher at May than any other months and lower at Won-pyeong streams than any other sites. The value of most inorganic components was highly correlated with those of other components. But the value of NO₃^--N was not correlated with that of most components, and PO₄^(3-)-P was not correlated with COD, NH₄^+-N, NO₃^--N, SO₄^(2-_.

압축성 코드에서 예조건화 코드로의 이진

한상훈(Sang-Hoon Han),김명호(Myeong-Ho Kim),최정열(Jeong-Yeol Choi) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.3

이차원 범프 유동에 대한 다양한 예조건화 행렬의 수렴 특성을 살펴 Choi와 Merkle의 예조건화 행렬을 선택하여, 압축성 및 예조건화 Roe의 Riemann 해법의 수치 소산항을 수학적으로 비교하였다. 이 결과 코드의 구조는 동일하게 유지한 채, 고유치의 작은 수정만으로 압축성 해법을 예조건화 해법으로 이전할 수 있는 방법을 알 수 있었다. 아울러 점성 유동 영역에서의 안정성 및 정확성을 향상시키기 위하여 von Neumann 안정 조건 및 점성 자코비안을 고려하였으며, 개발된 코드는 표준 검증 문제에 적용하여 검증을 수행하였다. Comprehensive mathematical comparison of numerical dissipation vector was made for a compressible and the preconditioned version Roe's Riemann solvers. Choi and Merkle type preconditioning method was selected from the investigation of the convergence characteristics of the various preconditioning methods for the flows over a two-dimensional bump. The investigation suggests a way of migration from a compressible code to a preconditioning code with a minor changes in Eigenvalues while maintaining the same code structure. Von Neumann stability condition and viscous Jacobian were considered additionally to improve the stability and accuracy for the viscous flow analysis. The developed code was validated through the applications to the standard validation problems.

흔치않은 대상포진 치험 2예 : 비전형적 부위와 다른 부위로 재발한 예 Unusal Dermatome and Recurs Other Dermatome

김정미,조은경,조정선,최용석,한영수,한정호,김두응,최진영 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

Herpes zoster is well known as an acute, self-limited disease of unilateral sensory dermatome caused by varicella-zoster virus and characterized by grouped vesicular skin eruption and pain over several dermatomes as well as single. This virus usually affects the thoracic dermatome and there are a few reports that this virus involves lower lumbar or sacral area, and recurrent cases. We experienced 2 cases that zoster virus involved L4 or S2 dermatome and left typical skin lesions, of which one was a recurrent case involving different dermatome at an interval of 8 years and the other was a rare case involving sacral dermatome.

데빅병 치료에 사용한 Interferon β-1b의 부작용 1예

김정미,조은경,조정선,최용석,한영수,한정호,김두응,최진영 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

A 63 year-old woman who had diagnosis of multiple sclerosis complaining left hemiparesis and fluctuating decreased visual acuity in her right eye and abnormal findings in pattern shift visual evoked potentials(PSVEPs) and on T2 weighted MR scanning. We treated her subcutaneously with 250μg interferon (3-lb(ITFß -lb) every other day. There were detected pancytopenia, skin rash, and abnormal liver function test seven days after the therapy. In spite of reducing the dose of interferon injection, abnormal laboratory findings were not returned to normal. Dose adjustment of interferon-I3 for body weight or race, may be helpful to reduce the side effects.

역전파 알고리즘을 이용한 자율주행로봇의 조향알고리즘 설계

정헌,최한수 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1

In this paper, we develope the direction indicator algorithm based on backpropagation for a mobile robot in an unknown environment. The structure of this neural network navigation system is composed of sensor system and backpropagation learning controllers for adjusting weight, the motion control system for real-time execution. The experimental results show that the developed direction indicator system operates properly and strongly at circumstance.

정신분열병 환자의 반응시간

최형식,정범석,김한규,송현주,이재원,김창윤 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.5

연구배경: 주의력은 인지적인 정보처리과정(information processing)의 가장 기본적인 단계이다. 반응시간 (reaction time)은 주의력을 가장 잘 반영하는 검사 중 하나로서, 자극이 제시된 후 반응이 시작되기까지 반응 여부를 결정하는데 걸리는 시간인 판단 시간(decision time)과 반응이 시작되면서 목표에 도달할 때까지 시간인 운동시간(motor time)으로 나누어 볼 수 있다. 기존의 연구결과로는, 정신분열병 환자군에서 반응시간의 수행이 떨어져 있다는 보고는 많이 되어왔으나 차이가 없다는 보고도 있으며, 판단시간과 운동시간 중 어느 부분에 장애가 있는지 명확하지 않다. 또한 반응시간 측정값은 질병의 진단적 유형(diagnostic subtype), 증상, 경과 등의 영향을 받으며 개체간의 변동(inter-individual variation)이 크고, 같은 피험자라도 측정시점이 다를 때마다 차이를 보이는 개체내 변동(intra-individual variation)이 커서 검사결과마다 차이를 보이고 있는 상태이다. 목적: 환자군은 개체간 변동이 크고 다른 임상적 요소에 의해 영향받는 점을 고려하여, 임상적으로 안정적인 경과에 있는 정신분열병 환자만을 대상으로 정상인 군과 반응시간의 차이를 비교하고자 하였다. 또한 반응시간을 판단시간과 운동시간으로 나누어 측정하여 각각을 비교분석 하고자 하였고, 개체내 변동이 큰점을 고려하여 25회 반복 측정을 실시하고 이에 따른 변동의 경향성을 조사하고자 하였다. 방법: DSM-Ⅳ에 의해 '정신분열병'으로 진단된 환자로서, 급성기 이후 항정신병약물을 유지하고 있으며BPRS(brief psychiatric rating scale) 30점 이하의 임상적으로 안정적인 상태가 3개월 이상 유지된10명이 환자군으로 포함되었고, 정상인은 자원자 10명이 포함되었다. 검사도구는 비엔나 테스트 시스템 반응유닛(Reation Unit) 파라미터 S8을 이용하였다. 총 6가지의 자극이 무작위로 1측정시기(session) 당 총 32회 주어지고, 피험자는 이중 특정 자극에 8번만 반응하도록 되어 있다. 시작 전 1회 연습 후 총 25측정시기를 5분 간격으로 반복하였다. 반응 시간을 판단시간과 운동시간의 합으로 정의하고 세 가지 모두 컴퓨터를 이용하여 자동 측정되었다. 반응·판단·운동 시간의 비교에는 반복 측정을 고려한 분산분석(repeated measures analysis of variance)을 사용하였다. 결과: 환자군은 정상인에 비하여 유의하게 반응시간의 수행속도가 저하되어 있었다(p<0.01). 판단시간과 운동시간으로 나누어 볼 때, 환자군에서 판단시간이 유의하게 느렸고(p<0.01), 운동시간은 수행저하의 경향을 보였으나 통계적으로 유의하지는 않았다. 25회 반복측정시 양군 모두 측정시기에 따른 유의한 변화를 보였고(p<0.01), 환자군의 반응시간은 개체간의 차이뿐 아니라 개체내 변동이 큰 경향을 보였다. 옳게 반응한 횟수(correct response)는 환자군에서 저하되는 경향을 보였으나 통계적으로 유의하지는 않았다. 고찰: 정신분열병 환자군에서 판단시간이 유의하게 저하된 것은, 반응시간의 저하가 운동요소 보다는 인지적 요소에 의한 것임을 시사하는 것으로, 정보처리과정의 기본적인 단계인 주의력 장애를 보여주는 것으로 생각된다. 비교적 안정적이고 임상적인 특성이 동일한 환자군에서도 반응시간이 대조군에 비해 큰 개체간 차이와 개체내 변동성의 경향을 보였으며, 이는 단순한 측정오차라기 보다는 정신분열병 환자군의 인지기능의 특성을 반영하는 것으로 생각된다. 중심단어:정신분열병·반응시간·판단시간·운동시간·개체간 변동·개체내 변동. The reaction time(RT) has been known to reflect attention that controls the flow of information processing. Extensive research has demonstrated cognitive impairment in schizophr-enia subjects using RT taske. However, little work has been done examining the relative contribution of DT(decision time) and MT(motor time) to slowed RT in schizophrenics. Also, recent investigators have observed that schizophrenic patients exhibit larger intra-individual variability in RT than do normal comparison subjects. The purpose of this study, using multi-stimulus convergent RT task, was to explore the speed of RT, relative contribution of decision time(DT) and motor time(MT) to slowed RT, overall sequential profile in 25 repeated-time measurements in 10 schizophrenic out-patients and 10 normal control subjects. Overall reaction time and decision time were slower in schizophrenic subjects than in normal controls. The motor time was not shown to be significantly different between the two groups with 0.05 significance level, although there was some trend indicating schizophrenic subjects were slower consistently in repreated measurements over time. These results suggested that the slower reaction time in schizophrenic subjects was mostly determined by cognitive component, decision time rather than motor time. Sequential profile of repeated measurements showed greater intraindividual and interindividual variations in schizphrenics than in normal controls. These results indicate that high variabilities are not merely measurement errors but characteristic of schizophrenic psychopathology. KEY WORDS: Schizophrenia·Reaction time·Decision time·Motor time·Inter-individual variation·Intra-individual variation.

餘暇生活 實態 推移에 관한 文獻考察

崔淙洙,韓正煥 忠北大學校師範大學附設 平生體育硏究所 1993 平生體育硏究所 論文集 Vol.6 No.-

The role and the function for the modern people are being deversified and varied in many ways owing to the material culture. With the representative books selected for the definite period, the wants I have considered the variation of the leisure are follows; 1) Accordign to the industrialization, the working hour is decreasing and leisure time is increasing, but the activity for this situation is not enough. 2) Female sex has more leisure time than male sex, but the leisure activity for female is wanting. 3) the ones who are over thirties have more leisure time than any other ages. 4) There are much different quantities of leisure time according to the kind of their vocation, so the leisure activity program for his own job is necessary. As a result of my studying for these situations. I have got the follwing conclusions. 1) The need for sports and creative recreations increasing. 2) Male is sleeping much time in sports, travel, and other activities, but female is spending her time in sleeping and domestic chore. 3) More educated people are enjoying more creative activities and sports, but less educated people are spending their time in sleeping, domestic chore, and watchig TV. A rural area has worse leisure time than a urban one an this present situation has been depended in the modernization of korea. Therefore the betterment should be made after due consideration of the difference of leisure time and quality of leisure action.

기혼여성의 신용카드사용과 제품구매에 관한 연구

최덕경,한정화 안성산업대학교 1998 論文集 Vol.30 No.2

This study is concerned with the credit card and the buying behavior of the urban females. The samples are composed of 750 female consumers filtered by the purposive sampling. In order to achieve study objects, the statistics used for data analysis are the frequency distribution and the chi-square analysis. The buying behaviors of the urban females showed the significant differences between the social demographic variables(age, education, the numbers of children, the residence type and the family type). The buying behaviors of the urban females showed the significant differences between the economic variables(family income, savings and occupation of females). The buying behaviors of the urban females showed the significant differences between the credit card related variables(the number of credit card usage, the spend money of credit card usage, the place of consumption) Findings of this study suggest the females have concerns of the credit card. They already have consumed in the use of the credit card. In order to improve the economic and the social wellbeing of the urban females, any type of consumers should have an opportunity to improve their knowledge and the information about the credit card.

BLDC 모터를 이용한 PV 양수 펌프 시스템

최성호,조정민,전기영,김성남,성낙규,김용주,한경희 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

In this paper, we adapted BLDC motor to PV water pumping systems to maintain high efficiency in the wide speed area. Also to design confidence, we adapted the vector control that drive the maximum torque at each speed limit. We designed optimal gain value of current, speed and pressure PI controller. Inverter gate pulse used Space Vector PWM to reduce torque pulsation of BLDC motor. Finally it was improve general matters of high water storage tank method by direct water supply pumping method.

내린천 유역의 HEC-HMS 모형 적용에 관한 연구

최한규,백효선,정병하 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

HEC-HMS model should be calibrated to be applied to these basins in Gangwon-do unlike the general basins. In the study, it is investigated whether the HEC-HMS model may be applied or not to Naerinchon basin where is the typical basin of Gangwon-do Additionally, the straightforword module of HEC-HMS for simulating the hydrologic characteristic of Gangwon-do basins well will be suggested by comparison of the numerical results with the observed data. The hydrologic results estimated by several modules such as Clark, SCS and Snyder methods in HEC-HMS model have been compared with the observed data for 1999~2000 storm events. It is concluded that Clark method are relatively applicable to the basins in Gangwon-do rather than the others methods. The parametric studies for HEC-HMS model should be studied further in order to apply to Gangwon-do basins more accurately.