• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.6
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• pp.1131-1136
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• 2020

Cooperative networks enhance the performance of communication systems by combining received signals from the several relay nodes where the source node transmits signals to relay nodes. In this paper, we analyze the effect of resource allocation in cooperative networks. We assume that the cooperative networks use the conventional modulation scheme between the source and relay nodes, and adopt space-time code between the relays and destination node. Both the synchronous and differential modulations are applied for the conventional scheme and differential modulation is used for the space-time code. We consider relay location and energy allocation for resource allocation, and the performance of cooperative networks depending on the number of relay is also investigated.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.7
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• pp.478-488
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• 2009

Using solar power in wireless sensor networks (WSNs) requires adaptation to a highly varying energy supply and to a battery constraint. From an application's perspective, however, it is often preferred to operate at a constant quality level as opposed to changing application behavior frequently. Reconciling the varying supply with the fixed demand requires good tools for allocating energy such that average of energy supply is computed and demand is fixed accordingly. In this paper, we propose a probabilistic observation-based model for harvested solar energy. Based on this model, we develop a time-slot-based energy allocation scheme to use the periodically harvested solar energy optimally, while minimizing the variance in energy allocation. We also implement the testbed and demonstrate the efficiency of the approach by using it.

• Korea Petroleum Association Journal
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• no.7 s.219
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• pp.58-59
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• 2000

산자부 공고 제 2000-104(2000.7.1)호에 의거, 2000년 하반기 나프타제조용 원유에 대한 할당관세 추천요령을 다음과 같이 공고한다.

• Korea Petroleum Association Journal
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• no.7 s.213
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• pp.60-61
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• 1999

산자부 공고 제 1999-129 ('99.7.1)호에 의거, '99 하반기 나프타제조용 원유에 대한 할당관세 추천요령을 다음과 같이 공고한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.4
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• pp.370-379
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• 2014

Recently, the interest in optical network with multifiber link is continuing to rise since the network traffic has been growing exponentially. However, growing traffic in network leads to increasing the energy consumption of the network equipment. In this paper, we propose a dynamic routing and wavelength assignment (RWA) algorithm based on V-like cost function and layered graph to improve energy efficiency in IP over WDM network with multifiber link. The V-like cost function is used to decide the fiber cost according to the number of used wavelengths. The layered graph with multifiber link is used to select the energy efficient route and wavelength. The proposed RWA algorithm is compared and analyzed with conventional algorithm in view of average power consumption and blocking probability through OPNET modeler.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.87-88
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• 2019

본 논문에서는 D2D 송수신 단말쌍을 결정하는 방법을 쌍대적 관점에서 살펴보기로 한다. 주어진 D2D 송신단말 그룹과 수신단말 그룹에서 에너지 최적화를 위한 D2D 송수신 단말쌍 할당은 송신단말 그룹이 수신단말 그룹이 되고, 수신단말 그룹이 송신단말 그룹이 되는 환경에서도 동일한 송수신 단말쌍이 할당되는 쌍대적 특성이 있음을 증명하도록 한다.

• Journal of Energy Engineering
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• v.25 no.4
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• pp.110-123
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• 2016

Since increase in energy consumption and environmental issues started to grab global attention, various countries have had their own supporting policy to promote supply of renewable energy which is a stable and eco-friendly energy source. This study analyses Korean Renewable Portfolio Standard by comparative analysis of current policies in major countries in respect of design components of a pragmatic industrial policy system, such as political leadership, policy coordination and consultative committee discussion, and policy enforcement with responsibility and transparency. This is to identify problems and to present political suggestions for successful management of the standard based on a fundamental concept of the pragmatism industrial policy. It is predicted that the strategic cooperation between a market and a government leads to industry development as the relationships of two parties are regarded not as antagonistic but as complementary.

• Korea Petroleum Association Journal
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• s.270
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• pp.62-63
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• 2009

• Korea Petroleum Association Journal
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• s.270
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• pp.64-66
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• 2009

• Korea Petroleum Association Journal
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• s.271
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• pp.60-62
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• 2009