• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.447-448
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• 2015

본 논문에서는 저속의 파장변환기를 갖는 ONU (optical network unit)로 구성된 TWDM PON(time and wavelength division multiplexed passive optical network)에 파장 할당 알고리즘을 제안한다. ONU는 파장을 변경할 때 많은 프레임시간을 소비하며 ONU별로 파장이 결정되면 그 결과를 바탕으로 OLT (optical line termination)는 동적대역할당을 실시한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.743-744
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• 2013

본 논문에서는 XGPON (10-Gigabit-capable passive optical network)을 기반으로 하는 TWDM (time and wave-division multiplexing) PON의 새로운 동적대역할당 알고리즘을 제안한다. 대부분의 TWDM PON은 EPON (Ethernet PON)을 기반으로 하여 동작하며 동적대역할당도 EPON의 동적대역할당 알고리즘을 변형시켜 사용한다. 본 논문에서는 XGPON의 동적대역할당 알고리즘을 개선하여 TWDM PON에 적합한 새로운 동적대역할당 알고리즘을 제안한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.739-740
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• 2013

본 논문에서는 XGPON (10-Gigabit-capable passive optical network)의 새로운 동적대역할당 알고리즘을 제안한다. 기존의 알고리즘들과 달리 제안된 알고리즘은 각 서비스 클래스별로 공통의 서비스 카운터를 갖는다. 그리고 하나의 서비스 클래스에서 사용되지 않고 남는 대역폭을 다른 서비스 클래스에서 사용할 수 있게 하여 대역폭 활용도를 향상시킨다. 제안된 알고리즘이 기존 알고리즘들에 비해 비교우위에 있는 것을 보이기 위해 다양한 예를 제시한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권8호
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• pp.1825-1842
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• 2013

Rapid growth of the IT industry has led to significant energy consumption in the last decade. Data centers swallow an enormous amount of electrical energy and have high operating costs and carbon dioxide excretions. In response to this, the dynamic consolidation of virtual machines (VMs) allows for efficient resource management and reduces power consumption through the live migration of VMs in the hosts. Moreover, each client typically has a service level agreement (SLA), this leads to stipulations in dealing with energy-performance trade-offs, as aggressive consolidation may lead to performance degradation beyond the negotiation. In this paper we propose a heuristic based resource allocation of VM selection and a VM allocation approach that aims to minimize the total energy consumption and operating costs while meeting the client-level SLA. Our experiment results demonstrate significant enhancements in cloud providers' profit and energy savings while improving the SLA at a certain level.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.35-38
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• 2004

The MAC protocol of HIPERLAN/2 is based on TDMA/TDD and AP (Access Point) can dynamically allocate the number of RCHs (Random CHannels). We propose a dynamic random channel allocation scheme improved by limiting the number of minimum RCHs. On a simulated scenario adopted practical Internet traffic, the proposed scheme is shown to achieve over $19\%$ lower delay than previously studied algorithm. This study will be a first step towards designing scope of RCHs for high-performance wireless packet network

• 한국통신학회논문지
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• 제26권10A호
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• pp.1756-1763
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• 2001

In this paper, we propose an ATM-LAN IWU(interworking unit) with threshold based dynamic bandwidth allocation scheme. We analyze a discrete-time based finite queueing model with deterministic service times in order to investigate the performance of the proposed scheme. It is known that the arrival process of IP packets is bursty. So we use an MMPP(Markov Modulated Poisson Process) to model the bursty input traffic. As performance measures, we obtain the packet loss probability and the mean packet delay. We present some numerical results to show the effects of the thresholds on the performance of the DBAS(dynamic bandwidth allocation scheme).

• 한국통신학회논문지
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• 제36권10B호
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• pp.1143-1149
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• 2011

한 개의 PON 시스템을 이용하여 여러 종류의 서비스 흑은 여러 서비스 공급자를 수용할 수 있도록 하는 Multi-OLT PON 구조를 제시하였다. 또한 이런 PON 구조에 적합한 동작 프로토콜 및 동적 대역할당 기법에 대하여 설명하였다. 성능 분석을 통해 제안한 구조의 PON 시스템이 매우 효율적이며, 향후 초고속 PON 시스템에서 효과적으로 이용필 수 있음을 알 수 있었다.

• 산업경영시스템학회지
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• 제30권1호
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• pp.8-14
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• 2007

This paper addresses the allocation planning of the storage location in a warehouse system that the dedicated storage method is used. In the discrete finite time period model, the demands for storage location of products are dynamic for time periods. The planning is to determine the reallocation time period and the storage location of the products in reallocation time period, which minimizes costs. The cost factors are the reallocation cost, the travel cost within warehouse and the surplus storage location cost. A model is formulated, and the property of optimal solution is characterized. The dynamic programming algorithm is developed, and a numerical example is shown.

• 제어로봇시스템학회논문지
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• 제18권8호
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• pp.794-799
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• 2012

The international standard, ISO-11783, was designed for the communication within an agriculture machinery. Even if it is based on the CAN (Control Area Network) protocol, its extended features which include point-to-point communication and large data transmission support show different network performance from the standard CAN. This paper proposes a dynamic priority allocation method to improve the real-time performance of ISO-11783. Computer simulation shows reduction of the deadline-missed cases and community latency via proposed algorithm.

• 전기학회논문지
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• 제58권5호
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• pp.1035-1040
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• 2009

We propose a new encoder/decoders based on an tune able wavelength converter(TWC) and an arrayed waveguide grating(AWG) router for large capacity optical CDMA networks. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC) and the generalized multi-wavelength Reed-Solomon code(GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.