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Yutae Kang,Jongsu Kim 대한수학회 2004 대한수학회지 Vol.41 No.5
On R2n, n ≥ 2, with the standard symplectic structure we construct compatible almost K¨ahler metrics with negative scalar curvature on a polydisc which are Euclidean away from the polydisc.
단일 업무 휴가, 복수 비업무 휴가 및 상태 의존 서비스를 갖는 이산 시각 Geo/G/1 대기열
Yutae Lee 한국정보통신학회 2024 한국정보통신학회논문지 Vol.28 No.3
This paper considers a Geo/G/1 queueing system within a discrete-time framework. The model seamlessly integrates state-dependent policies, incorporating both single working vacation and multiple vacations, thereby reflecting the dynamic nature of telecommunication environments. The matrix analytic method is utilized to analyze essential system performance indices, such as long-run probabilities of the distinct server states and the expected queue size of the system, offering insights into the nuanced behavior of Geo/G/1 queueing systems within the discrete-time framework. The results are expected to offer valuable insights for enhancing the performance of telecommunication networks. These insights cover various aspects, including single working vacations, multiple vacations, and state-dependent policies. Consequently, they are poised to establish a solid foundation for improving system efficiency and adapting to dynamic operational conditions.
Cognitive Radio Spectrum Access with Channel Partitioning for Secondary Handover Calls
Yutae Lee 한국전산응용수학회 2015 Journal of applied mathematics & informatics Vol.33 No.1
A dynamic spectrum access scheme with channel partitioning for secondary handover calls in cognitive radio networks is proposed to reduce forced termination probability due to spectrum handover failure. A continuous-time Markov chain method for evaluating its performance such as blocking probability, forced termination probability, and throughput is presented. Numerical and simulation results are provided to demonstrate the effectiveness of the proposed scheme with channel partitioning.
DISCRETE-TIME QUEUE WITH VARIABLE SERVICE CAPACITY
Yutae Lee 대한수학회 2005 대한수학회지 Vol.42 No.3
This paper considers a discrete-time queueing system with variable service capacity. Using the supplementary variable method and the generating function technique, we compute the joint probability distribution of queue length and remaining service time at an arbitrary slot boundary, and also compute the distribu-tion of the queue length at a departure time.
IEEE 802.11 SATURATION THROUGHPUT ANALYSIS WITH FREEZING OF BACKOFF COUNTERS
Yutae Lee 한국산업응용수학회 2005 한국산업응용수학회 학술대회 논문집 Vol.- No.-
This paper presents an accurate model for the performance analysis of IEEE 802.11 saturation throughput with freezing of the backoff counter. The model corrects the exiting model presented by Foh and Tantra.
Discrete-time GeoX/G/1 queue with place reservation discipline
Yutae Lee 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1-2
A discrete-time priority queueing system with place reservation discipline is studied, in which two different types of packets arrive according to batch geometric streams. It is assumed that there is a reserved place in the queue. Whenever a high-priority packet enters the queue, it will seize the reserved place and make a new reservation at the end of the queue. Low-priority arrivals take place at the end of the queue in the usual way. Using the probability generating function method, the joint distribution of system state and the delay distribution for each type are obtained.