파뢰기의 열화진단 전문가 시스템 개발에 관한 연구

길경석,김명진,한주섭 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-

This paper describes with an effect of a single- and a quadruple- lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose deterioration of arresters. In this study, an accelerated deterioration test is carried out to deduce the parameters needed for diagnosing arrester deterioration, and leakage current components are measured. Also, wave height distribution of the leakage current with the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed a conspicuous difference even in an immaterial leakage current increase. The use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method using only a leakage current value. Finally, the expert system based on the experimental reslts is developed, and the effectiveness of the system is estimated in a 18[kV] lightning arrester.

家族關係의 變化와 子女福祉에 대한 一考

조명래,이종길 건국대학교 사회정책연구소 1999 사회과학연구 Vol.12 No.-

중소 충적하천에서 Engelund & Hansen 공식에 의한 유사량 산정

안명길 三陟大學校 2000 論文集 Vol.33 No.2

하상의 재료가 사락으로 구성된 중소하천 하도에서 하상과 유수와의 작용, 즉 유수현상의 결과로 하상변동을 초래하게 된다. 이와 같은 현상을 구명하는데 있어서 부가결한 요소로서 적정한 공식으로 유사량을 산정하는 것은 매우 중요한 것이다. 본 연구에서는 유사량산정에 필요한 수리변수들을 직접 실측한 값을 중소 충적하천에서 잘 들어맞는 Engelund & Hansen공식을 적용하여 유사량을 산정하였다. At the small-to-medium Alluvial stream whose riverbed is composed with the rockfills, changes of the riverbed is caused by the phenomena of hydraulic, operations between the riverbed and running water. In order to examine this phenomena, it is important and essential to calculate the sediment discharge with the appropriate formula. In this study I have applied the variable of hydraulic which is necessary for computing the sediment discharge and calculated the sediment discharge with the Engelund & Hansen formula which suitable for the small-to-medium Alluvial stream.

위상수학에 관한 연구 : 리이만다양체에서의 임계사상에 관하여 On the Critical Mappings of the Riemannian Manifolds

전길웅,강명경 충남대학교 자연과학연구소 1982 忠南科學硏究誌 Vol.9 No.1

There are many defined functional on the space of smooth maps of one Riemannian manifold to another. Maps that are critical for every defined functional are called critical. This paper shows that the fibers of critical maps are minimal submanifolds. Also, it provides a characterization of hypercritical maps and shows that the inverse of the hypercritical map is hypercritical.

伽藍建築空間의 始原과 形成過程에 關한 硏究

예명해,최창길,이기승 대구대학교 (한사대학) 산업기술연구소 1988 産業技術硏究 Vol.7 No.-

The main purpose of placing Samgharama is to enshrine, cultivate and worship the subject of worship. Due to the transitions mentioned before Samgharama has been born and developed and concreted in its meaning with four periodical steps, as the subjects of worship changes. The four steps are 1) The Buddhist temples during the existence of Buddha. 2) The Buddhist temples that the central image of temple is sarira stupa. 3) The period, a stupa and a Buddhist image are the same importance in monastery life. 4) The period, a Buddhist image is a central subject of monastery life.

朝鮮時代 安東의 都市空間 構成原理에 關한 硏究 : 安東 邑基의 風水地理思想과 人爲的인 裨補思想을 중심으로

芮明海,崔昌吉,辛相和,李光明 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.6 No.2

Andong was selected at topographical divinatory location, which was based on topographical divinatory thought, when its building land, location of government office and foundation for village, etc. were selected in view of whole village. It can be found that pagoda and sweeping victorious objects were accepted, which were intended to expel evil spirit to death for safeguard of village, in order to complement its configuration and topography artificially if there were defects in the selected location. It can be also found that complementary thought with topographic divinatory theory was more popular in Andong than in others. We can't identify from when these thought was applied, but it can be found that it was popular nationally in Chosun Dynasty, when we look over cases such as stone walls with mast, etc. out of Naju-Eup(village), which also has moving ship type.

대입스트레스증후군에 관한 정신의학적 연구

백명기,이길홍,이규항,민병근 중앙대학교 의과대학 의과학연구소 1988 中央醫大誌 Vol.13 No.1

The author attempted to analyze the effect of collage entrance test stress on adolescent‘s mental disorder to secure effective measures coping with collage entrance test stress syndrome. The subjects consisted of 29 third grade high school students and 24 repeatees who were admitted to the neuropsychiatric department of Chung Ang University Hospital and Yongsan Hospital from January 1981 to September 1987. Wide spectra of data from the personal history were obtained through administration of KARI-M questionnaire developed by Korean Adolescent Research Institute, medical records available through psychiatric interview and MMPI and opinions of staff psychiatrists, psychiatric residents, nurses and social workers. The collected data were processed by IBM PC AT computer, using SPSS program, and were statistically analyzed by findings were as follows: 1. Among the total number of psychiatrically hospitalized adolescent inpatients, 11.9% was found to be third graders of senior high school and repeatees, of which 56.6% was found to be hospitalized due to college entrance test stress. A66.7 percent of repeatees, as compared to 48.3% of third graders of senior high school, experienced college entrance test stress. Increment of hospitalization rate due to college entrance test stress markedly changed from 35.7% in 1985-1986 to 70.6% in 1987. 2. The diagnostic categories of examinees were classified as neurotic disorder (30.2%), psychotic disorder (28.3%), adjustment disorder (18.9%), affective disorder (15.1%) and drug dependence (7.5%) etc in the order of frequency. Minor neurotic disorders such as somatization disorder and anxiety disorder were more frequently observed in the third graders of senior high school who were preparing college entrance examination, whereas the control group was more likely to be serious schizophrenic. 3. Third grade examinees with test stress who had been relatively stable in premorbid adaptation level experienced moderate level of stress related especially to changes in school life such as poor academic performance, whereas the control group was found to be suffered from stress arising from changers in family life. 4. The main complaint items of examinees were tension (30.2%), depressed affect (24.5%), suicidal idea (18.9%), persecutory idea (17.0%), headache (15.1%), broken sleep (15.1%), dizziness (15.1%), shyness (15.1%), in these orders, respectively. Also found, among them, were frustration (11.3%), dysphoria (9.4%), loss of interest (9.4%), rage (9.4%), numbness (9.4%), and restlessness (9.4%) etc. In regard to the complaining symptom complex, examinees showed the most frequently somatization (30.2%), and next, depression (18.9%), anxiety (13.2%), sleep disturbance (11.3%) and psychotic symptom complex (11.3%). Examinees with college entrance test stress much more complained of somatizations including headche, abnormal sensation of extremities etc, and anxieties such as tension and restlessness. 5. Examinees with college entrance test stress were more oftenly led to the hospital by their parents and admitted to open wards for about 2 weeks, but were more likely to be rehospitalized due to recurrence of symptoms. It was tended to be more likely that third graders visit the hospital during the first week of March to June, while repeatees were hospitalized most frequently during January and February immediately after the entrance examination. 6. A 34.0 percent of patient‘s guardians showed a lot of resistances to therapeutic milieu, not desiring of exposure of their patient’s demerits, but insisting on their children being treated medically under their consents, further lacking of the insight concerning their children‘s mental problems. This result suggested that the parents tend to deny their children’s problems due to college entrance test stress. It was found that reassurance technique was most effective in order to reduce parent‘s resistances to therapeutic situations. 7. A93.0 percent of examinees showed various resistance including to therapeutic systems. Somatization (22.6%), rebelliousness (18.9%), persistent avoidance (18.9%) and intellectual pursuit (7.5%) etc. In particular, college entrance test stress group showed more often persistent avoidance and intellectual pursuit than control group. 8. The main drugs prescribed to the examinees with college entrance test stress were amitriptyline (20.8%), chlorpromazine (18.9%), and thioridazine (17.0%) etc. Particularly antidepressants such as amitriptyline were more frequently prescribed to patients with college entrance test stress (46.8%) than to the control patients (30.4%). 9. A 67.9 percent of examinees were found to have personality disorders before hospitalization. Significant among these personality disorders were dramatic cluster (37.7%) including histrionic personality, borderline personality, and antisocial personality, anxious cluster (20.8%), an odd cluster (9.4%) such as schizoid personality and paranoid personality. 10. The analysis of MMPI revealed that examinees showed more significant hysterical and hypochondriacal profiles and less significant psychopathic profiles and neurasthenic profiles. These results taken together suggest final conclusions as follows: 1. The college entrance test stress groups show much more depressive trend, various fluctuation in school life, more sensitivity in stress perception, short stay in hospital and higher rate of rehospitalization, even though more stable in premorbid adaptation ability and against anxiety, as compared with control groups. The college entrance test stress patients tend to be hospitalized to open ward most frequently in the first week of March to June which is the first semester of school period. Most patients receive drug treatments including antipsychotic, antimanic, and anticonvulsant drugs along with group therapy, rather than behavior therapy. 2. Repeatees with the college entrance test stress have more seriously psychopathological problems, as compared to the graders showed higher psychotic trend due to family conflict and/or schooling avoidant introverted disposition.

CURRENT CONVEYOR에 의한 전류측정 프로우브 및 비접지 인닥턴스의 실현

金明起,金斗泳,金吉重 동아대학교 공과대학 부설 한국자원개발연구소 1980 硏究報告 Vol.4 No.2

Current conveyors as relatively newer active building blocks have been introduced by Smith and Sedra, and many possible applications have been explored during the past few years. The operation of the current conveyors is based on the principle of conveying equal currents at its output and input ports at different admittance levels. In this paper, a second generation current conveyor (CC-Ⅱ) with negative sign is applied to the design of a simple current measuring probe and to the synthesis of the floating inductance. Experiments were performed by using the CC-Ⅱ consisting of operational amplifiers realized by M. Sharif Bakhtiar and P. Aronhime. Experimental results agreed well with the theoretical values, and confirmed that the frequency limitation was confined by the frequency response of CC.-Ⅱ. If operational amplifiers with high frequency capability were used to realize the CC-Ⅱ, the frequency limitation could be improved.

상피종양의 keratin 생성능에 대한 전자현미경적 연구

이길선,이명주,장정수,이민전,노광을,서재홍 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1

Keratins are characteristically present in all keratinizing and nonkeratinizing epithelial cells and their neoplasms. They consist of at least 19 different polypeptides ranging from 40 to 69 kilodaltons, which are developmentally related to specific epithelial cell types. Keratins of high and intermediate molecular weights are readily demonstrated in squamous cell carcinomas, which are characteristically rich in tonofilaments and tonofilament-desmosome complexes. Keratins of low molecular weights are expressed in adenocarcinoma including renal cell carinoma, hepatocellular carcinoma, small cell carcinoma, and carcinoid tumor. These tumors do not reveal any tonofilaments and sacrcely show discrete filaments on electron microscopy. An immunoperoxidase technique employing antibody to keratin was used to study distribution and staining pattern of keratin filaments in benign and malignant epithelial tumors (20 squamous cell carcinomas, 20 gastric adenocarcinomas, 20 transitional cell carcinomas and 15 non-neoplastic epithelia). These immunohistochemical results were compared with ultrastructural features of neoplastic diagnosis of squamous cell carcinoma, adenocarcinoma and transitional cell carcinoma, and estimation of degree of differentiation. The results are as follows : 1. The squamous epithelium, glandular epithelium and transitional epithelium disclosed the positive reaction for keratin. 2. Squamous cell carcinoma and transitional cell carcinoma exhibited positive reaction for keratin. 3. Gastric adenocarcinoma showed uniformly negative or weakly positive reaction for keratin. 4. On electron microscopy, heavy bundles of tonofilaments and desmosomes were more frequently encountered in well differentiated squamous cell carcinoma, In poorly differentiated squamous cell carcinoma, a few tonofibrils and desmosome were noted. 5. In the adenocarcinomas, the intermediate filaments were arranged randomly as nonaggregated, short filaments spread throughout the cytoplasm, although occasionally they formed a perinuclear whorl. These filaments did not become aggregated to form tonofilaments. 6. On the immunogold labeling for keratin of low molecular weight areas in gastric adenocinoma, in tense labeling of intermediate filaments for keratin was noted. From the above result, ultrastructural and immunohistochemical study on malignant epithelial cell were useful in differential diagnosis of squamous cell carcinoma, adenocarcinoma and transitional cell carcinoma, and estimation of degree of differentiation. It was also proved that immunogold labeling technique was especially valuable for diagnosis of vague case which showed negative or weakly positive reaction in immunohistochemical stain.

석탄가스화 복합발전용 가압기포유동층에서 석탄-가스 혼합의 거동 해석

고명한,최길수,박성하,강용 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.1

본 연구에 사용한 가압기포유동층장치는 가압기체공급부분, 가압유동층, 미분체포집부분등으로 이루어져 있다. 가압기체공급은 30HP compressor를 이용하였고, 가압기포유동층은 스텐레스 철로 만들었는데 직경은 0.1m 높이는 3.5m로 하였다. 가압유동층에 사용한 유동입자는 188∼875㎛의 4종류로 국내산 무연탄을 사용하였고, 적용한 실험 변수는 유동입자, 층내부의 압력(100∼500kPa), 과잉기체유속(U-Umf; 0.05∼0.25m/s) 등으로 결정하였다. 상온 상태에서 가압유동층에서 국부적인 압력 변동에 관한 통계적 해석으로 strange attractor 표준편차 및 Fractal 해석을 적용하였다. 가압유동촌에서 strange attractor는 기체유속이 증가하면 커지고 압력이 증가하면 감소하였다. 또한, strange attractor의 궤적 및 Pox diagram의 경향성으로부터 기체 유속보다는 압력의 영향력이 더 크게 작용함을 알 수 있었다. 표준편차 및 Fractal 차원은 과잉기체유속이 증가하면 증가하고, 압력이 증가하면 감소하였다. Strange attractor와 표준편차는 상관성이 좋고, 표준편차와 Fractal 차원과는 상관성이 잘 나타내고 있음을 확인할 수 있었다. Equipment used in this study were composed of pressurized air generating part, fluidization column. and fine particle collecting part. The compressed air used was sullied by 30 HP compressor into the fluidization column which was an 10cm diameter and 3.5m height. The pressure (100-500 kPa) was measured with sensor and regulated by means of globe valves. The gas phase, pressurized air, was fed to the column(excess gas velocity, U-Umf=0.05-0.25m/s) through distributor. The solid phase Particle used was coal particles(188-875 ㎛). The obtained data can be analyzed by strange attractor, standard deviation, and Fractal dimension obtained from the stochastic analysis of local pressure fluctuations at room temperature in the pressurized bubbling fluidized bed. The strange attractor increases with increasing gas velocity and decreases with increasing pressure. A tendency defined from the trace of strange attractor and the Pox diagram represented that pressure was more important than gas velocity in these experimental conditions. Both standard deviation and Fractal dimension increase with increasing gas velocity but decrease with increasing pressure. Results obtained from stochastic analysis of pressure fluctuation source show good correlation between strange attractor and standard deviation, and also between standard deviation and Fractal dimension.