http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
장무성,권영일,강보식 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
Product performance deteriorates over time, and the event in which the performance degradation reaches a pre-specified threshold valueis often defined as a failure. If performance degradation of a product is observable, the degradation data can be used to obtain the informationon product reliability. The degradation data often provide more information on product reliability than failure time data. Forreliability qualification of mechanical components, such as pneumatic cylinders, a zero-failure test based on product failure time is widelyused. When the degradation data is available, a reliability qualification test can be designed based on performance degradation datainstead of failure time data. In this paper, we proposed a reliability qualification test method for pneumatic cylinders based on performancedegradation data. Comparison analysis between degradation-based and zero-failure test methods was performed. The proposedreliability qualification test based on performance degradation data required a shorter test time and a lower number of samples than thezero-failure test.
장무성,이충성,최병오,강보식 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
This paper presents a validation method for Accelerated life tests (ALTs) of pneumatic cylinders. Two ALTs using each temperatureand pressure stress were performed. Weibull analyses for these ALTs and their combination data were conducted. The comparison analysiswas carried out between predictions based on ALTs and results obtained from normal use conditions. In other words, the validation ofALTs was conducted by applying hypothesis tests and confidence intervals for Weibull parameters. Finally, the Weibull shape parameter,the acceleration index of pressure, the activation energy for temperature, and the life cycles (B10 and characteristic) under normal useconditions for pneumatic cylinders were obtained.
Reliability evaluation of scroll compressor for system air conditioner
장무성,Jong-Won Park,Young-Min Choi,Tae-Kook Park,최병오,Chang-Joo Shin 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
This study presents a reliability evaluation method of the scroll compressor for system air conditioner. After conducting reliability target determination and failure analysis (failure mode and effect analysis) on the scroll compressor, the significance of the stress factors affecting wear (main failure mode) is evaluated using design of experiments. Specifically, wear is estimated under various test conditions using analysis results. The lifetime of the scroll compressor is estimated using the data of zero-failure accelerated life test performed under various test conditions. The result satisfies the warranty lifetime of the scroll compressor. Finally, the procedure of reliability determination test for the scroll compressor is briefly proposed.
Reliability Estimation of Pneumatic Cylinders using Performance Degradation Data
장무성,강보식,신정훈,권영일,최병오,이충성 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The time allowed for life testing to assess the reliability of a product is continuously reduced and the test at normal use conditions often yields few or no failures. This situation especially occurs in testing products with long lifetime such as pneumatic cylinders. Performance degradation data often provide more accurate estimates on product reliability than those from failure time data. This paper presents a method for estimating parameters of lifetime distribution using the performance degradation data of pneumatic cylinders at normal use conditions. For this purpose, degradation analysis was carried out and the estimates from performance degradation data were compared with those from failure time data. According to the results, when considering test time and an uncertainty of reliability estimates, degradation analysis was strongly recommended rather than failure time analysis with censored data for the pneumatic cylinder.
장무성,김정곤,엄용섭 대한신경정신의학회 1987 신경정신의학 Vol.26 No.1
A clinical study of aggression was performed on 379 inpatknts, who admitted at Neuropsychiatric Department, Pusan Paik Hospital, In-Je Medical College, from June 1985 to May 1986, Among the patients, 48 patients (12.7%) show overt aggression, such as physical aggression against other people, against objects, against self, and verbal aggression, and 114 incidents were observed during that time. The results are as follows ; 1) Among the aggressive patients, there were more males than females, and more young than old. 2) The differences in the number of aggressive patients by education state were statistically not significant 3) Among the aggressive patients, the most commonly represented diagnosis was the diagnostic group of organic psychotic condition and mental retardation, next, personality disorder, schizophrenia. 4) Forced patients in the course of admission were much more aggressive than the adviced or voluntary patients. 5) Most of aggressive incidents (76.3%) were observed within 1 Month, especially within 2 weeks (50%). 6) AH incidents of aggression were petty. 7) Patients with explosive premorbid peronality were highly aggressive, and patients with paranoid or borderline premorbid personality were relatively more aggressive than patients with other premorbid personality. 8) Most of the incidents occurred during the daytime, especially during from 6 P.M. to 9 P.M. (25.4%). 9) Charge doctors were the commonest targets (32.5%), next nursing staff (21.1%), and male nursing aides (14.0%). 10) Anger (35.1%) was the commonest emotion associated with aggressive behavior, next, teasing (23.7%), and rage (14.9%). 11) Medication, restraint, or combination of medication and restraint were more frequently used than interview in the management of aggressive schizophrenia, organic psychotic condition and mental retardation, and visa versa in the management of personality disorder.
장무성,김영훈 인제대학교 1985 仁濟醫學 Vol.6 No.4
동맥류 수술 후 전두엽경색이 초래된 환자에게 나타난 이차성조증 1례를 Lithium carbonate로, 일산화탄소중독 후 신경증상 및 내분비조절기능장애를 보여온 환자의 양극성 정동장애 1례를 Diphenylhaydantoin으로 각기 치료하여 2년간 임상경과 중 효과적 결과를 얻었기에 속발성 정동장애에 대한 문헌 고찰과 함께 이를 보고한다. Usually mania occurs as a phase of manic-depressive illness, but it can be produced by toxic, metabolic, or other neurologic disorders. Mania occurred secondary to these medical or pharmacological antecedents are best considered secondary manias in patient with no history of affective disorder. The authors report two cases of secondary mania without prior psychiatric history, one of which developed mania secondary to bilateral frontal infarctions following aneurysmal neck clipping, and the other developed rapid cycling bipolar disorder with many paroxysmal neurologic signs such as tonic-clonic seizure, cataplexy, transient dysarthria. The therapeutic response and prophylactic effect of Lithium carbonate were certain in the patient with frontal infarctions, and Diphenylhydantoin alone could control all of his affective symptoms over 18 months as well as neurologic signs in the patient with paroxysmal cerebral dysfunctions.