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Pipe 및 Hose Ass'y 생산시스템 공정최적화 설계 연구
윤철호,이수완 선문대학교·중소기업기술지원연구소 1998 선문공대 연구/기술 논문집 Vol.3 No.1
자동차 에어콘 부품인 Pipe 및 Hose 조립 공정의 생산성을 향상시키기 위하여 공정분석을 실시하였다 시간 연구법에 의해 대상 공정인 5개의 Pipe 및 Hose Ass’y공정에 대한 관측을 하였고. 그 결과 공정별 요소작업및 요소작업별 표준시간을 설정하였다 표준시간을 기초자료로 활용하여 line balancing을 실시한 결과 공정을 재배치 하게되면 공정의 균형 손실이 현저하게 줄어든다는 것을 알 수 있었다. Process analysis was conducted to improve productivity of the automobile airconditioner parts assembly lines. First, five pipe and hose assembly lines were observed by time study methodology. Using the results, element works of target assembly lines and standard time of element works were fixed. Next, line balancing methodology was utilized to evaluate current productivity of target process and layout status The results suggested remarkable line balancing effects when target process relocated
윤경산,주철수,윤만희 大邱大學校 社會科學硏究所 2001 社會科學硏究 Vol.9 No.1
이 연구의 목적은 관계 마케팅에 있어 지각된 서비스 공정성의 결정적인 역할에 대해 이해하고자 하는 것이다. 본 연구는 서비스 공정성과 관계 마케팅 변수들(관계품질과 고객만족)의 관계, 그리고 고객만족과 관계품질의 연결에 대해 검증하였다. 자료는 대구에 소재한 멤버십 할인매장을 방문한 고객들 중 250명을 분석의 대상으로 하였고, 다중 회귀분석은 만족스러운 모델 적합도를 보여주었다. 제안된 가설들 중 6개의 가설이 통계적으로 지지되었다. 검증 결과 서비스 공정성은 고객만족과 관계품질에 모두 유의한 영향을 미치는 것으로 나타났으나, 분배공정성은 관계품질에 유의한 영향을 미치지 않는 것으로 나타났다.
하영철,정수일,곽윤근,신현익,하헌정,김익환,김석만 金烏工科大學校 1999 論文集 Vol.20 No.-
This paper presents the future direction of the development and maintenance of the urban park of the Kumi city. The direction was obtained by analyzing the evaluation results on the satisfaction level of park use and the park image of the park users. The analysis results are as follows. 1) It turns out that the rest and accommodation facilities are the major facilities that uplifts the total image of the park. 2) Among the park images, the image on the pleasantness was the major image, related with the satisfaction on the park equipments. 3) The social class, who gave a bad score on the above equipments and images, is a low-aged class, who is a white class with high income as well. Therefore, it is suggested that the park maintenance plan, with emphasis on the class, is an important task.
김윤철,이정우,김보영,강정아,임대승,이민수,김정희,성보영,최성준,성인환,전은석 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.1
Coronary stent implacement is known as an effective treatment in the intimal dissection after percutaneous transluminal coronary angioplasty and the prevention of restenosis. However, In-stent restenosis still remains a major concern in clinical stenting. The stents were placed in 103 patients from July 1996 to March 1999 and performed follow-up coronary angiograms in 59(57.3%) patients. To identify the clinical, angiographic and procedurerelated variables 'which predict late restenosis within the stented artery, 59 patients(58.3±9.9, M:F= 41:18) were studied. The clinical characteristics of the patients were stable angina in 23(39.0%), unstable angina in 14(23.7%), acute myocardial infarction in 21(35.6%) and old myocardial infarction in 1(1.7%). Coronary stenting was performed in 1 patient(1.7%) for primary lesion, 50 patients(84.7%) for suboptimal results after PTCA, 6 patients(10.2%) for bail-out procedure, and 2 patients(3.4%) for restenotic lesions. All patients were treated with aspirin and ticlopidinc. The follow-up angiograms were obtained at 7±4 months. The overall in-stent restenosis rate was 27.1%. The coronary angiographic findings were 32 single vessel(54.2%), 19 two vessel(32.2%) and 8 three vessel disease(13.6%). The angiographic morphological characteristics were type A in 33(55.9%), type B in 14(23.7%), type C in 12(20. 3%) cases. Variables of 16 patients with restenosis were compared with those of 43 patients without restenosis. Previously known predictors for in-stent restenosis were multiple stenting, stenting for restenotic lesions, residual stenosis after stenting, stenting for total occlusion lesions, reference diameter, balloon to vessel ratio, acute gain and minimal luminal diameter after procedure, design and characteristics of stents, ostial lesion of aorta, high pressure method for stenting, lesion length, diabetes mellitus, size of artheroma, saphenous vein grafts, ulcerlating lesions and calcified lesions. In this study, Reference diameter before stenting(2.43±0.54mm vs. 2.88±0.65mm, p=0.016) and balloon-to-artery ratio(1.28±0.26 vs. 1.11±0.18, p=0.006) were predictors for in-stent restenosis. 1) The overall in-stent restenosis rate was 27.1%. 2) In the analysis of predictors for in-stent restenosis, there was no significant differences in clinical, angiographic factors between group with restenosis and without restenosis. But, Only reference diameter before stenting and balloon-toartery ratio were predictors of late in-stent restenosis. In conclusion, stenting is effective revascularisation method for selected patients with ischemic heart disease, and to minimize in-stent restenosis rate, stent implanting is achieved in a large vessel on the basis of an artery-to-stnet ration of 1:1, if possible.
다양한 기준응답 데이터를 이용한 디지탈 PID 제어기의 파라미터 결정 방법
김윤상,오현철,안비오,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.2
This paper presents an efficient algorithm which determines the parameters of digital PID controller. The proposed algorithm is an algebraic method to obtain controller parameters using various reference responses data, which makes design procedure general as well as straightfoward. Simple examples are given to demonstrate the effectiveness of our method with respect to various reference responses data.
吳顯哲,金潤相,安斗守 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-
This paper presents a design method of optimal tracking controller and reduced-order obsercer for time invariant comtinuous system using STWS(single term Walsh series). In optimal control, it is well known that the design problem with quadratic performance criteria often involves the determination of time varying feedback gain matrix by solving the matrix nonlinear Riccati equation and of command signal by solving the intergral equation, which makes design procedure quite difficult. Therefore, in order to resolve this problem this paper introduces STWS. In this paper, the time-varying feedback gains and command signals are determined by piecewise constant gains which can be easily determined by algebraic equation using STWS.
비구조적 미지 시스템을 위한 라구에르 네트워크의 적응력 근사화
김윤상,오현철,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1
This paper presents an efficient method which can approximate the systems with unstructured dynamics using Laguerre networks. The proposed method is to approximate a unstuctured unknown systems adaptively from only input-output information, which can exclude additional procedure for system identification and thus reduce the required computational burden for real-time approximation. Higher convergence speed is achieved with our manner.
근사 역시스템을 이용한 비최소위상플랜트의 적응제어기 설계
오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1
This paper presents approach to the adaptive control of nonminimum-phase continuoustime systems. The usual model reference adaptive control methods cannot be applied to nonminimum-phase systems, because unstable pole-zero cancellations cannot be avoided. In this paper, it is shown that pole-zero cancellations can he avoided by using approximate inverse systems. The least square approximation is used to find these approximate inverse systems.