• 대한족부족관절학회지
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• 제19권2호
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• pp.47-50
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• 2015

Microfracture procedure has been widely recognized as the primary surgical treatment for an osteochondral lesion of the talus. However, if symptoms persist after initial surgery, selection of a secondary procedure can be difficult. The author desciribes the advantage and value of autologous osteochondral transplantation as a secondary procedure after failed microfracture for osteochondral lesion with a review of sevral previous published articles.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.799-802
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• 1995

Whale helical gears is used to transmit motion between parallel shafts, the shaft bearings are subjected to both radial and thrust loads. The reliability and life analysis are based on the two-parameter Weibull disribution lives of the component gears and bearings. Two methods of estimating the time between gear system overhauls and the number of replacement components needed were presented. The first method assumes replacement of all components during an overhaul of a failed gear system. the second method assumes replacement of failed comonents only. Renewal theory was presented to estimate the number of comonent replacements in a gear system for both methods.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.430-433
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• 1999

Woo[8]proposed dual-token based fault-tolerant scheduling algorithm in multiprocessor environment for resolving the problem of old systems that have a central dispatcher processor. However, this algorithm does not present token allocation algorithm in detail when central dispatcher processor has failed. In this paper, we propose a fault detection algorithm and processor selection algorithm for token allocation when central dispatcher processor has failed.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2000년도 추계학술대회
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• pp.387-395
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• 2000

Circular consecutive-k-out-of-n:F system when the failure of component is dependent is studied. We assume that the failure of a component in the system increase the failure rate of the survivor which is working just before the failed component. In this case, a mean time to failure (MTTF), a average failure number of the system, and the expected cost per unit time are obtained. Then the minimum number of consecutive failed components to cause system failure to minimize the expected cost per unit time is determined as searching paths to system failure. And various numerical examples are studied.

• 한국데이터정보과학회:학술대회논문집
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• 한국데이터정보과학회 2002년도 춘계학술대회
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• pp.89-95
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• 2002

This paper considers the problem of estimating paramaters of the bivariate exponential distribution with a loaction parameter for a two-component shared parallel system using component data from system-level life test terminated at the time of the prespecified number of system failure. In the system-level life testing, there are three patterns of failure types; 1) both component failed 2) both component censored 3) one is failed and the other is censored. In the third case, we assume that the failure time might be known or unknown. The maximum likelihood estimators are obtained for the case of known/unknown failure time when the other component is censored.

• 품질경영학회지
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• 제19권2호
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• pp.78-85
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• 1991

In this paper, an inspection and replacement policy in a redundant system is considered. It is assumed that the state of the redundant system is known by inspection. When the system is inspected, it is preventively replaced only if the number of failed units exceeds the predetermined limit. Otherwise, the system is inspected after a inspection interval which depends on the number of failed units. We obtain the optimal number of redundant units, inspection intervals and replacement limit minimizing the expected cost rate.

• 원자력산업
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• 제4권2호통권18호
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• pp.28-39
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• 1984

• 대한소아치과학회지
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• 제43권1호
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• pp.51-59
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• 2016

하악 제1대구치의 매복은 흔치 않은 맹출 장애이나 부정교합, 낭종성 변화, 치관 주위염, 인접치아의 치근 흡수와 같은 많은 합병증을 야기한다. 이에 본 연구에서는 하악 제1대구치의 매복이 관찰된 6세 이상의 아동 67명과 그들에서 관찰된 74개의 매복된 하악 제1대구치를 대상으로 역학적 조사를 시행하고 매복 양상에 대하여 평가해 보았다. 그 결과로 매복치의 유병률은 남자가 여자보다 높았으며, 좌우측의 차이는 없었다. 매복에 대한 평균 인지 연령은 9.19세로 제1대구치의 평균 맹출 연령보다 약 3세가량 늦었다. 또한 매복의 원인으로서 원인불명이 가장 많았으며 비정상적인 맹출 경로를 가진 경우, 치성종양, 낭종성 변화의 증대 순이었다. 매복양상은 Type I이 가장 많았고, Type III, Type IV, Type II순이었으며 매복치의 맹출 유도를 위해서는 외과적 노출술이 가장 많이 시행되었다. 본 연구를 통하여 저자는 아동을 대상으로 하악 제1대구치의 맹출 연령에 대한 구강 교육이 필요하며 영구치 맹출 시기의 정기적인 치과 검진이 이루어질 것을 권장하는 바이다.

• 보건교육건강증진학회지
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• 제21권1호
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• pp.137-151
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• 2004

Objectives： This study aims to investigate the psychological factors associated with abstention following a smoking cessation program, and to suggest useful information for those who want to stop . smoking and health practitioners who help them Methods： Participants were 73 smokers (65 males, 8 females) that participated in a hospitalized smoking cessation program, whose mean age was 44.89 (SD＝9.61). Participants completed questionnaires and psychological tests including： Demographic sheet, Eysenck's Personality Questionnaire, Multidimensional Coping Scale, Fagerstrom Test for Nicotine Dependence, and Jerusalem and Schwarzer's Self-Efficacy Scale. To identify whether the subjects abstained or not and to encourage them to abstain, the researcher called them on the telephone once a week for three months. After three months, they were contacted every other week till six months passed since they had left the smoking cessation program Tthey were THEN contacted once a month for another six months. The data was analyzed by using ANCOVAs with SPSS 10.0 for Windows. Results： 42 (57.5％) out of 73 abstained for one month and 26 (35.6％) abstained for one year. People who failed to abstain within a month showed a higher psychoticism and introversion personality trait than those who abstained for one month, while people who abstained for one month were coping actively in most situations, showed a higher self-efficacy and lower nicotine dependence than those who failed to abstain within a month, and people who failed to abstain within a year showed a higher psychoticism than those who abstained for one year. While people who abstained for one year were coping actively, obstinate, and interpreting positively most situations, they showed a higher self-efficacy than those who failed to abstain within a year. Conclusion： These findings reiterate the roles of personality, self-esteem, nicotine dependence in smoking and suggest the roles for smoking cessation. And it was found the roles of coping styles ,in smoking cessation. It might help smokers who want to stop smoking and health practitioners who help them

• Journal of Korean Neurosurgical Society
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• 제29권2호
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• pp.203-209
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• 2000

Objective : The authors retrospectively analysed the factors affecting the favorable outcomes in the treatment of the Failed Back Surgery Syndrome(FBSS) or six years. Method : From March 1991 to December 1996, seventy-five patients were diagnosed as FBSS and its incidence was 3.4% of admitted patients with back pain in our department. We analysed the demographic data, etiologies, clinical menifestations, outcomes according to methods of operation, numbers of previous surgery, and time intervals between initial operation and final operation. Result : The most common etiology and previous surgical method of FBSS were insufficient surgery(54.7%) and partial laminectomy(53.3%). Patients were managed as followings ; Total laminectomy and spinal fusion with instrument in 41 cases(54.7%), total laminectomy without fusion in 23 cases(30.7%), and only partial laminectomy in 11 cases(14.7%). The overall treatment outcome was satisfactory in 48 cases(64%). Satisfactory results were observed in those patients who were treated by spinal fusion after complete laminectomy(34 cases), who had underwent only one operation previously(45 cases), and when the time interval between the initial operation and reoperation is shorter than 12 months(43 cases). Conclusion : The treatment outcome in FBSS was favorable in cases of the complete total laminectomy and spinal fusion with instrument, only one previous back surgery, and short time interval between initial and final operations.