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박치항(Park Chee Hang),김주만(Kim Joo Man),이철훈(Lee Cheol Hoon) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.2
This paper deals with the static task-assignment problem in a distributed computing system. In assigning tasks, we have to persue maximization of load balancing and minimization of interprocessor communication(IPC) simultaneously. However, since these two goals conflict each other, one has to make a compromise between them according to the given task type. Most of the existing approaches minimize IPC subject to constraints on the degree to which the processors' loads are balances. Since they consider the minimization of IPC as the only objective while using load balancing just as a constraint, it is difficult to make a tradeoff between IPC and load balancing. However, it is desirable to simultaneously balance loads and minimize IPC by making an optimal tradeoff between the two conflicting goals. We therefore propose a new cost function to evaluate static task assignments, explicitly describing the tradeoff between the two goals. The variance statistics of load distribution are used to represent the degree of load balancing among the processors for a given assignment. Also suggested is a policy which enables the system designer to make a tradeoff between the two goals by systematically adjusting a weighting factor. It is shown that the task-assignment problem can be transformed into the minimum N-cut problem using a graph modification technique. We propose a heuristic algorithm for solving the transformed problem. Simulation results show that our approach outperforms an existing representative approach for a variety of task and processing systems.
Data-driven SIRMs-connected FIS for prediction of external tendon stress
See Hung Lau,Chee Khoon Ng,Kai Meng Tay 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.1
This paper presents a novel harmony search (HS)-based data-driven single input rule modules (SIRMs)-connected fuzzy inference system (FIS) for the prediction of stress in externally prestressed tendon. The proposed method attempts to extract causal relationship of a system from an input-output pairs of data even without knowing the complete physical knowledge of the system. The monotonicity property is then exploited as an additional qualitative information to obtain a meaningful SIRMs-connected FIS model. This method is then validated using results from test data of the literature. Several parameters, such as initial tendon depth to beam ratio; deviators spacing to the initial tendon depth ratio; and distance of a concentrated load from the nearest support to the effective beam span are considered. A computer simulation for estimating the stress increase in externally prestressed tendon, Δfps, is then reported. The contributions of this paper is two folds; (i) it contributes towards a new monotonicity-preserving data-driven FIS model in fuzzy modeling and (ii) it provides a novel solution for estimating the Δfps even without a complete physical knowledge of unbonded tendons.
Mach Reflection of Sinusoidally-Modulated Nonlinear Stokes Waves by a Thin Wedge
Choi, Hang-S.,Chee, Won-S. The Society of Naval Architects of Korea 1993 Selected papers of the society of naval architects Vol.1 No.1
By using multiple-scale expansion techniques, the Mach reflection of sinusoidally- modulated nonlinear Stokes waves by a stationary thin wedge has been studied within the framework of potential theory. It is shown that the evolution of diffracted wave amplitude can be described by the Zakharov equation to the loading order and that It reduces to the cubic Schrodinger equation with an additional linear term in the case of stable modulations. Computations are made for the cubic Schrodinger equation for different values of nonlinear and dispersion parameters. Numerical results reflect the experimental findings in terms of the amplitude and width of generated stem waves. Based on the computations it is concluded that the nonlinearity dominates the wave field, while the dispersion does not significantly affect the wave evolution.
오흥근,남순호,방서욱,신치만,이예철 대한마취과학회 1986 Korean Journal of Anesthesiology Vol.19 No.3
Fourty one cases with cornary occlusive disease were anesthetized for aortocoronary bypass graft from May 1977 to December 1983 at Severance Hospital, Yonsei University Medical Center. The main anesthetic agents were diazepam-morphine-pancuronium-O_2-N_2O in most cases, and supplemented with halothane, enflurane or methoxy flurane in some cases. Nitroglycerin, nitroprusside, triflupromazine and dopamine were used for keeping the hemodynamic stability before, during and after anesthesia depending on the needs. Two operative death occured in our early years. The mortality rate was 4.87% and no late deaths. The overall anesthetic management for aortocoronary bypass graft surgery is disscussed.