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오늘 본 자료
New Aggregation Algorithm for Tandem queue with Finite Buffers
김종환,Hur, Sung Kwan,徐承祿 大邱大學校附設 基礎科學硏究所 1991 基礎科學硏究 Vol.8 No.-
We consider a two-stage fmite tandem queueing system with Poisson arrivals and negative exponential service times. The customer who has completed his service at the first station has to go directlty to the second station. If the queue of the second station is full at the moment of the service completion of the customer at the first station, then the customer receives, another service at the first station. This is repeated until the customer completes a service at the first station at the moment that the second station is not fulL The problem of calculating the steady-state probabilities of this queueing system by the ordinary balance equations is time consuming. We develop an efficient algorithm to obtain the steady-state probabilities that utilize the two-way state aggregation techniques.
김종환,홍재승 한국스포츠산업경영학회 2003 한국스포츠산업경영학회지 Vol.8 No.2
프로축구리그관중의 만족도와 재구매의도의 상관요인분석에 관한 연구김종환 (중앙대학교), 홍재승 (서울대학교)
김종환,김형일,유종민 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Although silicon carbide (SiC) is a material of excellent acid resistance, the reaction bonded SiC needs an additional protection to withstand the severe condition of semiconductor washing step, in which HF/H<sub>2</sub>O<sub>2</sub> or H<sub>2</sub>SO<sub>4</sub> is used at higher temperature for a long period of time. The coating materials containing fluorinated alkyl groups were selected as a efficient protection material for SiC in preventing the deterioration of physical properties due to the corrosion of surface in acidic condition. Perfluoroalkylsilane, which contained silane groups capable of coupling with oxidized functional groups on SiC surface, was used as a coating material. The incorporation of fluorinated alkyl group on SiC was investigated by varying the conditions of temperature and content of perfluoroalkylsilane. Fluorine group incorporated on SiC surface was confirmed by FTIR-ATR. The morphology of surface treated SiC was studied using SEM/AFM. The chemical resistance of SiC was evaluated in a harsh acidic condition.
골다공증(骨多孔症)에 관(關)한 문헌적(文獻的) 고찰(考察) -주로 최근(最近)의 한의학적(韓醫學的) 임상(臨床) 및 실험논문(實驗論文)을 중심(中心)으로
김종환,Kim Jong-Hwan 대한침구의학회 1998 대한침구의학회지 Vol.15 No.2
Osteopotosis is a disease characterized by reduced amount of bone mass leading to enhanced bone flagility. The number of patients with osteoporotic vertebral fracture is increasing and it is one of the leading causes of morbidity in the elderly and postmenopausal women. It is a condition in which bone mass decrease, causing bones to be more susceptible to fracture. A trivial trauma can easily cause one or more bones to break in a person with severe osteoporosis. So it is a major health problem. Pysicians and patients are concerned with the optimum approach to the treatment and prevention of osteoporosis. Until a recent date, many oriental medicine studies were performed to find the preventive and curative efficacy on the osteoporosis, which is differ from therapeutics of Western-medicine. The proper use of Herb-med and role of Accupuncture are issues that have generated major research efforts. This study was carried out to investigate evaluation of clinical and experimental study on the osteoporosis. So, these are to be mentioned in this paper.
우선순위에 의한 차단과 대기 취소를 고려한 유한 용량의 대기행렬에 대한 분석
김종환 대구대학교 산업기술연구소 1993 産業技術硏究 Vol.12 No.-
We consider a two class, N-server cutoff priority queueing system with Poisson arrivals and negative exponential service times and reneging. High priority arrivals finding N servers busy enter a queue of size B₁. In order to keep available servers free for the high priority servers are busy. Low priority customers in a queue may be reneged after a time, which is negative exponentially distributed. We derive an (N+B₁-c+1) linear equation system using a special structure of the system, from which the steady-state probabilities are obtained.
김종환,박석환 대구대학교 산업기술연구소 1993 産業技術硏究 Vol.12 No.-
This paper presents an algorithm for the tandem queueing system with blocking and feedback. The blocking mechanism encountered in this paper is communication blocking. The great dimensionality of the state space renders the analysis of such system a formidable task. The state aggregation reduce the cardinality of the linear equations needed to solve the system. We propose an efficient algorithm to obtain the marginal state probabilities for the two-stage system. Other performance measures, such as the utilization, the blocking probability, the average sojourn time, and the average queue length, can be easily calculated.
새로운 백금 착체(II) 화합물의 흰쥐 혈장에서 대사체 확인
김종환,조요나,노영수,서성훈,정지창,장성구,이규홍,이주한,이경태,Kim, Jong-Whan,Jo, Yo-Na,Rho, Young-Soo,Seo, Seong-Hoon,Jung, Jee-Chang,Chang, Sung-Goo,Lee, Kyoe-Heung,Lee, Joo-Han,Lee, Kyung-Tae 한국약제학회 1998 Journal of Pharmaceutical Investigation Vol.28 No.3
KHPC-002 $[(trans-l-diaminocyclohexane-bis-l,2(diphenylphosphinoethane)platinum)\;{\cdot}2NO_3]$ and $KHPC-006[(cis-diaminocyclohexane-bis-1,2(diphenylphosphinoethane)platinum)\;{\cdot}2NO_3]$ were synthesized as candidates for third platinum antitumor agent. Before their pharmacokinetic study, we optimized the analytical condition with HPLC and identified the major metabolites in the rat plasma. HPLC analysis by $C_{18}$ reverse-phase column showed that standard peak of both compounds appeared rapidly at around 1 minutes, whereas metabolites of KHPC-002 and KHPC-006 which were extracted from plasma after single I.V. administration in rats or incubation for 24 hr at $37^{\circ}C$ showed retention time of $10{\sim}11$ minutes. These metabolites were identified as the major compound by Matrix Associated Laser Deposition/Ionization (MALDI), which only lose the 2 molecules of $NO_3$. Based on these results, we suggest that the major metabolites of KHPC-002 and KHPC-006 were [trans-l-diamino-cyclohexane-bis-l,2(diphenylphosphinoethane)platinum] and [cis-diaminocyclohexane-bis-l.2(diphenylphosphinoethane)platinum], respectively.