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PID제어기의 새로운 파라미터조정법에 의한 디젤기관의 適應速度制御
유희한(H.H.Yoo),하주식(J.S.Ha) 한국해양대학교 해사산업연구소 1997 海事産業硏究所論文集 Vol.6 No.-
Most of speed controllers of a marine diesel engine developed are still using the PID control algorithm. But, the performance of a marine diesel engine is widely changed according to the parameters of the PID conrollers. As an another approach to the speed control of a marine diesel engine, this paper proposes a new method to adjust the parameters of the PID controller by a model matching method. Actually, it is very difficult to find out the value of parameters of a diesel engine accurately. Hence, in this paper, a method to estimate the parameters of a diesel engine by the least square method and a method to adjust the parameters of the PID controller for the speed control of a diesel engine by means of the model matching method are proposed. And also, this paper confirms that the proposed method here is superior to Ziegler&Nichols's method through the analysis of the characteristics of indicial responses.
김현곤,이병길,최두호,유상근,김말희,이해동,유희종,Kim, H.G.,Lee, B.G.,Choi, D.H.,Yoo, S.K.,Kim, M.H.,Lee, H.D.,Yoo, H.J. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.1
AAA(Authentication, Authorization, and Accounting) 정보보호 기술은 유/무선 인터넷, 휴대인터넷, Mobile IP, VoIP 등 다양한 서비스 접속을 위한 인증/권한 검증/과금 기능을 제공하기 위한 기술이다. 현재 IETF 표준화 기구에서는 AAA에 관련된 표준을 제정하고 있다. IETF AAA 작업그룹에서 Diameter기반 프로토콜에 대한 표준화를 진행하고 있으며, 지속적인 표준화 작업을 통하여 RFC 표준 6개와 인터넷 드래프트 6개가 진행중이다. 본 고에서는 이러한 Diameter 기반 AAA 정보보호 기술에 대해 현재까지의 표준화 진행 상태 및 표준화 방향을 IETF AAA 작업그룹 중심으로 살펴본다.
전화망 트래픽정보 데이터웨어하우스 구축을 통한 서비스품질요소 분석 방안
조유희(Yoo H. Cho),박길주(Kil J. Park) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅲ
최근 기업의 정보기술에 대한 중요성이 부각되면서 통신업체를 비롯하여 다양한 업종에서 데이터웨어하우징 기법과 연계한 통합 정보 시스팀을 이미 구축하였거나 서둘러 구축하고 있다. 본 논문에서는 교환기에서 출력하고 있는 원시트래픽데이터를 기반으로 전화망 트래픽정보 데이터웨어하우스(Data Warehouse, 이하 DW)를 구축할 경우, 이를 통해 보다 다양한 서비스 품질 분석이 가능함을 보이고자 한다. 지금까지 트래픽데이터는 최번시의 데이터만을 대상으로 단편적인 분석만 수행해 왔는데, DW 구축을 통해 이를 전 시간대 데이터로 그 대상 범위를 수행할 수 있다. DW 구축시 전화망에서 측정 가능한 완료율을 포함한 폭주율, 화중율, 오번호율 등 품질요소들에 대하여 보다 세분화하여 심층 분석가능하고, 시간차원, 지역차원을 기준으로 다각적으로 분석 가능하다. 뿐만 아니라, DW 구축시에는 다차원 모델링을 적용하기 때문에 어느 계층의 사용자 요구사항이라도 신속하게 원하는 정보에 접근할도록 지원할 수 있다.
김흥대,정연탁,황영희,유희구,김완식 대한마취과학회 1977 Korean Journal of Anesthesiology Vol.10 No.3
The mechanism of stimulation produced analgesia has been proposed to involve neurophysiologic and neurohumoral inhibitory effect at the level of the spinal cord, brain stem, thalamus and cortex. And yet it was not clear, but will improve the chance of understanding pain mechanism and providing effective method for pain control with improved superstimulation technics. Nevertheless, the low frequency electrical acupuncture therapy was given and found to relieve the pain to the fourty three cases who had not responding to the various methods of cealing with pain at the pain clinic in Han Yang University Hospital from March to September 1977. The technics and procedure of treatment is described. The results of the low frequency electrical acupuncture stimulation therapy are following with short term of one or two period. Twenty three cases(53.49%) showed marked improvedment, 16 cases(37.24%) showed improvement, 4 cases(9.31%) transient improvement and there were no case of fail. The technics and proceduresis easy to learn, apply and can carried out by the residents or staff. It is economical and there are no series of complications except are seen a generalized fatigue in few cases.
許景渤,金益洙,兪熙,閔珖植 順天鄕病院 1977 順天鄕醫報 Vol.2 No.1
Carcinoma is one of the most frequently observed malignant tumor in Korean patients. Result of surgery, for instance, in early stomach carcinomais encouraging and it is reported to be about 45% of five year survival rate but cases are few and rare. The majority of cases are that of either unresectable or metastatic regional lymphnode involvement of carcinoma. Their prognosis is poor. In those who had regional lymph node metastasis two year and three year survival rates are reported tobe each 37.1% and 17.9% respectively. Development of tumor immunology of the malignant disease made us greatly interested on the immunotheraly on the post resection stomach carcinoma. Studies on immunological competency by way of D.N.C.B. skin test started from 1971 and few cases those who may understand the new development of additional immuno therapy were selecter for B.C.G. innoculation after the subtotal gastrectomy. Recently monitering of peripheral thymus depentent lymphocytes (T-cell) count were undertaken to correlate the clinical course of the patients with the immunotherapy. In order to evaluate the immunological competency of healthy and all kind of malignant deseases of different stages, study with D.N.C.B. sensitization was undertaken in 264 cases. In healthy men of 53, only one man showed anergy, this anergic man is still healthy after three year observation. Table 1 further demonstrate the incedence of D.N.C.B. anergy in each group of patients, it notes that the unresectable malignant patients showed anergy 77 out of 105 cases(73.3%). From the D.N.C.B. sensirtization studies it may be clear to state that patient's immunological competency inthe malignant disease is severly deteriorated in the advanced tumo patients. The peripheral T-cell count also showed that the advanced malignant patients had lower T-cell count and it is progressively decreasing at the terminal stage(Table 2). In few cases who has B.C.G. after the subtotal gastrectomy the T-cell count are increasing after the treatment(Table 4). In 1971 five partients received B.C.G. therapy after the subtotal gastrectomy and three patients are sill living well. These 5 had all regional lymph node metastasis. The usual three year survival ratein similar patients is about 17 to 20%. Number of B.C.G. cases are not sufficient to a statistical significance but it may suggest a good deal of implication. Chance of two year survival after the B.C.G. therapy may be also far better than non-B.C.G.group(Table 5). The immunotherapy on malignant patients may be controversial, and yet we understand that the malignant tumor patients had impared immunity or immnological ability and that B.C.G. or immunotherapy may be effective on microscopic malignant lesion. In a selected case an immunotherapy after subtotal gastrectomy for gastric carcinoma may offer a beneficial effects on clinical course of the disease.
김완식,이진근,유희구,황영희 대한마취과학회 1976 Korean Journal of Anesthesiology Vol.9 No.2
Although the acupuncture is not accepted medical therapeutic method in Korea, the author has been undertaken to treat various conditions of pain in an pain clinic at HANYANG University Hospital during 11 months from 1975 to 1976 to 62 patients who had not responding to conventional treatments such as medication, nerve block, physiotherapy and psychotherepy .etc. At the result of the electrical Acupumcture stimulation, 17 patients (27.4%) showed marked improvement, 21 patients (33. 9%) showed improvement and 21 patients (33. 9%3 transient improvement. The total confidence showed O8 patients (61. 3%), furthermore the longterm results of these follow up study will be carried continuously with the questioners within 6 months. And also the mechanisms of the stimulation produced analgesia reviewed with the recent reported several literatures. In conclusion, acupuncture can be used to relief of various pain for which coventional trea tments are less effective. Acupuncture is relatively easy to learn and to practice by the acquisi- tion of minimal knowledge of the technique.