Fracture Behavior of Locally Corroded Steel Pipeline in District Heating System Using the Combination of Electrochemistry and Fracture Mechanics

Seon‑Hong Kim,Yoon‑Sik So,Jung‑Gu Kim 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11

To identify the effects of the stress concentration at the pit on the fracture of the district heating (DH) pipeline, the stressincrease with the wall thickness reduction was formulated. The formula includes the stress intensity factor with the pittingcorrosion. As a result of the application of the DH pipeline conditions to the ASME B31.3 code formula and corrosion test,the interplay with only uniform corrosion and stress due to the internal pressure can not be an immediate reason for the DHpipeline fracture. The KIvalue which is calculated by loss of thickness due to both uniform and localized corrosion exceededfracture toughness value (42 MPa√m) of the weldment pipeline steel (ASTM A106 Gr. B) under all of the studied conditions.

經路分析을 通한 健康信念模型에 關한 硏究

洪大容,최학의,鄭善太 慶尙大學校 1985 論文集 Vol.24 No.1

A theoretical framework of "Health Belief Model" were used to examine the factors which are assumed to impact upon health belief and preventive action. The survey was carried out from Oct. 1 to 30, 1984 with a representative sample of middle and high school students (N=1.868) by structured questionaire. The results of zero-order correlation analysis, multiple regression analysis and path analysis were as follows : 1) The simple correlation analysis reveals that the variables affecting the preventive action are school grade(p<0.05), sex(p<0.05), area (p, 0.05), parent's education level (p<0.05). The results indicated that the higher school grade is, the more the preventive action is and urban area shows higher preventive action than rural area. Girl students showed higher preventive action than boy students. Parent's education level was proved to be effective on the preventive action, too. But pre-recommendation of preventive action showed non significant relationship with the preventive action, therefore it was not proved that the cue to action variables are important to explain health behavior. 2) According to the results obtained by multiple regression analysis, the threat about disease is affected by sex (β=0.1913), area (β=-0.0801), economic level (β=-0.0480) and academic a chievement (β=-0.0648) at very significant level (p<0.001). The perceived benefits of preventive action, considered to be as positive health belief variable turns out to be affected by parent's education level (β=0.0062), economic level (β=0.0661), academic achievement (f=-0.0330) and the knowledge about disease (β=0.1075) at very significant level (p<0.001). In this results, we can find the difference between positive health belief and negative health belief. On the contrary to the threat about disease, education was doing a very important role on the perceived benefits of preventive action. 3) The factors affecting the Preventive action were Proved to be school grade (β=-0.1138), sex (β=-0.0839), area (β=0.0866), economic level (β=-0.0438), the threat about disease (β=0.0439) and the Perceived benefits of preventive action (β=0.0424) (p<0.001). In point, we can find the preventive action is affected more by the threat about disease than by the perceived benefits of preventive action. Therefore it can be stressed that the promotion of the health behavioral change can be achieved effectively by negative health belief than by positive health belief in a city or rural area except metropolitan city. So we can say the different approaching method is needed according to the circumstances of each area to attain the desired end. 4) The path analysis shows the same results of the multiple regression analysis. Among the variables (individual characteristic variables, cue to action variable, health belief variables), only sex and health belief variables are affected more by causal effect than by non-causal effect. And the hypothesis, the health behavior are affected by health belief, is proved to be ture.

The ANN Design of a DC / AC Servo-Motor Driving Circuit

홍선학 瑞逸專門大學 2000 論文集 Vol.18 No.-

폐결핵 환자의 우울 상태

홍정표,최선희,조만종,이성주,박종,김기순,김양옥 朝鮮大學校 附設 醫學硏究所 1997 The Medical Journal of Chosun University Vol.22 No.1

The main purpose of this study is to identify and evaluate the depressive states for the patients with chronic pulmonary tuberculosis. A questionnaire(Self-rating Depression Scale, SDS) survey was performed toward 57 pulmonary tuberculosis patients with initial treatment who started chemotherapy and 53 pulmonary tuberculosis patients with retreatment, admitted to one tuberculosis-centered hospital and two general hospital. Fifty three healthy persons as control group were investigated with the same questionnaire for comparison. The survey was performed from July to August 1996. The results are as follws : 1. The patients had significantly high scores in the depression than control and the patient with retreatment showed significantly high scores in the depression than the patient with initia1treatment(P<0.01). 2. The depressive levels of the patients were associated with duration of admission and the expectancy of recovery (P<0.05). 3. The percentage of the subjects with 40 or more scores tentatively classifiable as psychologically depressed was 67.1% of the total subjects, 48.4% of the control groups, 75.0% of the patient with initial treatment and 84.1% of the patient with retreatment. Because patient with pulmonary tuberculosis with initial treatment showed higher depression scores than normal persons, and patients with retreatment due to failure of initial treatment showed higher depression scores than initial treatment, it is necessary to give attention to depression of the patients during treatment of pulmonary tuberculosis.

잎들깨 수량과 단백질체 발현에 미치는 UV-B의 영향

홍성창,황선웅,장안철,신평균,장병춘,이철원 한국환경농학회 2006 한국환경농학회지 Vol.25 No.1

척수 손상인의 상부 운동원성 신경인성 장의대장 통과 시간과 배변 관리

임선희,나은우,이일영,조기홍 大韓再活醫學會 2000 Annals of Rehabilitation Medicine Vol.24 No.3

만성중이염의 골도청력변화

박선홍,노용훈,이도용,나한조,김용기,최봉남,도남용 朝鮮大學校 附設 醫學硏究所 1996 The Medical Journal of Chosun University Vol.21 No.1

We have usually experienced bone conduction impairment in chronic otitis media, but it is unclear that raised bone conduction threshold is due to the reflection of cochlear dam- age and / or Carhart effect ( an artificial elevation of bone conduction threshold due to conductive defect ) or both. The purpose of this study is to verify the influence of the artificial elevation of the bone conduction threshold in chronic otitis media and to estimate Carhart effect. A total of 336 cases of tympanoplasty with unilateral chronic otitis media without any other causes of sensorineural hearing loss was studied. The average threshold levels of the bone conduction in diseased ears ranged from 18.5dB at 4kHz to 12.1dB at 250Hz The longer duration of the disease, the larger perforation size, the more severe damage of the middle ear structure and the presence of the cholesteatoma made bone conduction threshold increased. The postoperative thresholds of bone conduction were Improved in 36 cases (40.4%) of the 89 cases that underwent operation with type I tympanoplasty technique without electrie drilling. The degree of the maximal improvement was 14.3dB at 2000Hz and the minimum was 8.8dB at 250Hz. but these result did differ from a statistically significant degree. The result suggest that the bone conduction threshold in chronic otitis media is elevated artificially by conductive defect and improved by successful reconstructive surgery.

혐기성 순차 회분조를 이용한 폐수처리에 관한 모델링

강선홍 광운대학교 신기술연구소 1997 신기술연구소논문집 Vol.26 No.-

본 논문에서는 Monod 식을 이용하여 폐수내의 유기물질의 제거 기작을 수학적으로 도출한 뒤 graphical method를 이용하여 시간에 따른 기질의 농도를 예측하여 현장에서 ASBR을 설계·적용하는 데 기초적인 도움이 되고자 하였다. 기질의 농도 측정값과 모델에 의한 이론적인 계산 값들을 비교한 결과 실측값과 이론 값들이 잘 일치함을 볼 수 있었고, 따라서 Monod식에 근거한 모델이 적절하게 시간 경과에 따른 기질의 농도변화를 예측함을 알 수 있었다. Many researchers have been conducted on the biological treatment of wastewater using anaerobic sequencing batch reactor (ASBR) system. However, nothing has been done to mathematically describe the substrate removal kinetics to date. To apply ASBR system into the real field, the understanding and knowledge on the microbial growth, activity, and substrate removal phenomenon are required. Therefore, the main objective of this research is to attempt to mathematically describe the substrate removal kinetics using Monod expressions and to predict the substrate concentration changes with respect to time.

식민지시기 사범교육의 경험과 기억 : 경성사범학교 졸업생들의 회고를 중심으로

안홍선 한국교육사학회 2007 한국교육사학 Vol.29 No.1

본고에서는 경성사범학교 졸업자들의 회고를 분석하여, 이들이 실제로 경험한 사범교육과 비교·검증하고, 식민지시기 사범교육의 특질 및 학생들의 수용구조를 고찰하고자 하였다. 경성사범학교 졸업자들의 기억에는 주요한 모티브들이 반복적으로 나타나고 있는데, 당시의 사범교육은 보편적 교사교육을 지향했으며, 페스탈로치가 모범적인 교사상으로 강조되었고, 경성사범학교는 자유주의교육의 전당이었다는 인상들이 활성화되어 술회되고 있는 것이다. 그러나 경성사범학교의 교육실천은 이들의 기억과는 거리가 먼 것이었다. 이처럼 식민지시기의 사범교육에 대해 실제로 경험한 것과 다르게 선별적으로 기억하고 있는 것은 스스로를 정당화하기 위해 보편적인 철학과 교육사상 등을 원용하여 융합시키는 천황주의 이데올로기의 잡식성으로부터 기인하고 있었다. 그리고 식민지시기 사범교육이 학생들에게 효과적으로 수용되는 데에는 내면화된 규율권력으로서 엘리트주의와 온정주의의 계기가 내재되어 있었다. The purpose of this study is to analyze the collective memory of normal education in colonial Korea, focusing on Kyung-Sung Normal School(KSNS) which was the model of normal schools during this time. The collective memory of the graduates of KSNS is structurized by some repetitive motives. They often say that the spirit of KSNS was universal and liberal, rejecting the colonialism of the Japanese educational authority. However, KSNS was the heart of colonial education to build the discriminative ethnic system justified by the ideology of the Japanese imperialism and nationalism. Comparing the memorized education with the experienced education of KSNS, we come to know the collective memory of KSNS is very selective. The reason is that the education of KSNS hid its discriminative, colonial, and nationalistic features by borrowing the universal concepts from Confucianism and Pestalozzi. Furthermore, the students were exposed to the discipline power provided by the schooling system of KSNS. The elitism and paternalism of KSNS internalized the self-consciousness of the colonized elites who were willing to be integrated and subjected to the ruling power, the colonizers. Therefore, analyzing the collective memory of the graduates of KSNS, we can conclude that the normal education of KSNS was performed to interpellate the Korean students as loyal imperial subjects and self-disciplined teachers in colonial Korea.

만성 정신분열증 환자에 있어 Clozapine 투여에 의한 비정형적 Prolactin반응

이홍식,김찬형,기선완 대한신경정신의학회 1994 신경정신의학 Vol.33 No.3

Objects : Typical antipsychotic drugs robustily increase prolactin both in rodents and in man. Unlike in rodents, Meltzer(1989) found that acutely administered clozapine did not increases serum prolactin levels in schizophrenia and his preliminary data suggested that prolactin levels might even be reduced during clozapine treatment. Methods : We investigated the serum prolactin levels in chronic schizophrenics, who were assigned to clozapine(N=28) or haloperidol(N=20) for eight weeks. Blood samples were obtained biweekly during the study period, and serum prolactin concentrations were measured by standard double-antibody radioimmunoassay. Results : The serum prolactin levels were not changed in the schizophrenic patients to whom clozapine had been administrated, otherwise marked increases in serum prolactin level were observed in the haloperidol treatment group. Conclusion : Our results suggest that clozapine differs from typical antipsychotics(e.g., haloperidol) in its failure to produce serum prolactin elevation in schizophrenic patients.