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최충식,하청근,권기석 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
The aim of the thesis is to value the features of Sequencing Batch Reactor and to discover the optimum condition by using synthetic wastewater. So as to develop the economical, efficient wastewater treatment technology which can remove substrate and nitrogen compounds by SBR Fill and Reaction time control. The results are summarized as fallows. 1. COD and T-N removal efficiency was below 95% in case of volumetric organic loading of 3㎏ BOD/㎥ day by Sequencing Batch Reactor. 2. Almost COD removed in the Fill time. 3. Various DO concentration are maximum in the Reaction time, and minimum in the Settle and Idle time. 4. COD and T-N were almost removed in Fill and Reaction time, the most suitable period was 5-3-2hr(Fill-Reaction-Settle). Removal efficiency of COD and T-N were over 98%.
대동맥 이첨판과 승모판 이탈증을 동반한 대동맥 판하부 협착 1예
김용화,장경식,양태영,임영국,안기완,홍순표 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
Discrete subaortic stenosis is a rare cardiac disorder especially in Orientals which occupies eight to ten percent of aortic stenosis, It occurs mainly before age of eighteen and accompanies with aortic valve abnormalities such as aortic stenosis, supravalvrlar stenosis, bicuspid valve and muscular hypertrophic subaortic stenosis, and other cardiac abnormalities such as ventricular septal defect, pulmonary stenosis and coarctation of aorta. There is no report of discrete subaortic stenosis accompanied with mitral valve prolapse. The major complications of discrete subaortic stenosis are aortic insufficiency, and subacute bacterial endocarditis. We report a case of asymptomatic nineteen-year-old male of discrete subaotic stenosis with bicuspid aortic valve and mitral valve prolapse, which is comfirmed by two-dimensional and Doppler echocardiography including transesophaigeal echocardiography.
신경회로망에서 뉴런간의 연결도를 이용한 4색 배치 문제 해결 알고리즘
임재윤,이기태,김덕주,현해진,강부식 濟州大學校工科大學附屬産業技術硏究所 1993 尖端技術硏究所論文集 Vol.4 No.-
In this paper we have proposed a method for solving a four-coloring problem using adjusted information transmission between adjacent neurons in neural networks. These algorithms are based on McCclloch-Pitts binary neuron model neural networks. If a map shares n regions, a 4×n neural array is used to color a map of n regions where each neuron as a processing element performs it. By programming these algorithm by a C-language in IBM PC 486 DX and adapting it to various examples, we have showed the ability of our system. If one neuron is selected among four neurons, the strength of order three neurons is wakened. So, by transmitting the information of selected neuron, adjacent neurons cannot share the same color.
섭동계수를 갖는 단일 자기부상 시스템의 강인한 제어기 개발에 관한 연구
이형기,변기식,신춘식,탁한호 釜山工業大學校 1991 論文集 Vol.33 No.-
A EMS(Electro Magnet Suspension) nonlinear system is linearized by using Taylor series expansion around nominal point. A method of stability analysis for a low-order characteristic equation with perturbed coefficients is proposed. A PID controller to the linearized EMS system is designed by the method. Computer simulations are carried out in the system with the controller for various masses.
김만고,황용연,변기식 釜山工業大學校 1995 論文集 Vol.37 No.-
Modeling and reliability analysis technique of telecommunications power system is proposed. The telecommunications power system can be modeled as a serial connection of two parallel redundant systems. One is a rectifier system, and another is AC system composed of both engine alternator and commercial source. The reliability analysis is performed for three distributed power systems. The analysis shows that two engine-alternators with reduced battery reserve can be used instead of the conventional one engine-alternator with three-hour battery reserve. This technique can also be applied to the reliability analyses of other DC uninterruptible power systems.
신경회로망에서 뉴런간의 연결도를 이용한 4백 배치 문제 해결 알고리즘
현해진,김덕주,강부식,이기태,임재윤 濟州大學校 工科大學 産業技術硏究所 1993 産業技術硏究報告 Vol.4 No.-
In this paper we have proposed a method for solving a four-coloring problem using adjusted information transmission between adjacent neurons in neural networks. These algorithms are based on McCclloch-Pitts binary neuron model neural networks. If a map shares n regions, a 4×n neural array is used to color a map of n regions where each neuron as a processing element performs it. By programming these algorithm by a C-language in IBM PC 486 DX and adapting it to various examples, we have showed the ability of our system. If one neuron is selected among four neurons, the strength of order three neurons is wakened. So, by transmitting the information of selected neuron, adjacent neurons cannot share the same color.
간 낭종을 동반한 성인 다낭신 환자에서 간 낭종의 감염 1예
정규성,서정철,주기산,김원식,임영국,정종훈,문철웅 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
Adult polycystic kidney disease(APKD) usually accompanies with renal and extrarenal manifestations and liver cysts are present in aproximately 30% of patients with APKD. Kidney cysts often accompany with hemorrhage, rupture, infection, however, liver cysts are usually asymptomatic and do not impair liver function. Rare complication of liver cysts in patient with APKD include portal hypertension with bleeding esophageal varices and hepatic failure with encephalopathy. But, in APKD patient, infection of liver cysts without infection of renal cysts is extremely rare. We report a case of infected liver cyst in a patient with APKD who has complained generalized abdominal pain and high fever which was confirmed by ultrasound and aspiration. The patient was treated successfully with repeated aspiration and systemic antibiotics.
한상만,박한석,변기식 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
Local heating transportation pipe has sensor and return lines to detect water- leakage. There are impulse and resistance comparison measurementtypes for a water-leakage detection. The impulse type shows large detection error within a measurement range. Since the resistance comparison type can find a comparative accurate single water-leakage point in the measurement range of heating pipe. it has used to detect water-leakages these days. However if the multi water-leakages are happened in the measurement range of trange of transportation pipe. the resistance comparison type shows a detection error point by the parallel resistance between a detection sensor line and ground. But the detection error will be minimized by the divided transportation pipe loops. In this research, it suggests the design of remote controlled detector which can divide a large pipe loop and a possible single water-leakage measurement process in each divided loops.