• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.403-405
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• 2000

This paper presents a N-player game theory application for analyzing power transactions in a deregulated energy marketplace such as PoolCo, where, participants, especially, generating entities, maximize their net profits through optimal bidding strategies (i.e., bidding prices and bidding generations). In this paper, the electricity market for power transactions is modeled as a non-cooperative. N-player game with complete information, where the solution is determined in a continuous strategy domain having recourse to the Nash equilibrium idea.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.400-402
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• 2000

This paper presents a game theoretic approach for power transactions analysis in a competitive market. The considered competitive power market is regarded as PooICo model, and the participating players are restricted by only two generating entities for simplicity in this paper. The analysis is performed on the basis of marginal cost based relations of bidding price and bidding generations. That is, we assume that the bidding price of each player is determined by the marginal cost when the bidding generation is pre-determined. This paper models the power transaction as a two player game and analyzes by applying the Nash eauilibrium idea. The generalized game model for power transactions covering constant-sum(especially zero-sum), and nonconstant-sum game is developed in this paper. Also, the analysis for each game model are performed in the case studies. Here, we have defined the payoff of each player as the weighted sum of both player's profits.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1344-1346
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• 1999

This paper presents a game theoretic approach for power transactions analysis in a competitive market. The considered competitive power market is regarded as PoolCO model, and the participating players are restricted by only two generating entities for simplicity in this paper. The analysis is performed on the basis of marginal cost based relations of bidding price and bidding generations. That is, we assume that the bidding price of each player is determined by the marginal cost when the bidding generation is pre-determined. This paper models the power transaction as a two player game and analyzes by applying the Nash eauilibrium idea. The generalized game model for power transactions covering constant-sum(especially zero-sum), and nonconstant-sum game is developed in this paper. Also, the analysis for each game model are Performed in the case studies. Here, we have defined the payoff of each player as the weighted sum of both player's profits.

• 대한전기학회논문지:전력기술부문A
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• 제52권6호
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• pp.347-353
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• 2003

In models of imperfect competition of deregulated electricity markets, the key task is to find the Nash equilibrium(NE). The approaches for finding the NE have had two major bottlenecks: computation of mixed strategy equilibrium and treatment of multi-player games. This paper proposes a payoff matrix approach that resolves these bottlenecks. The proposed method can efficiently find a mixed strategy equilibrium in a multi-player game. The formulation of the m condition for a three-player game is introduced and a basic computation scheme of solving nonlinear equalities and checking inequalities is proposed. In order to relieve the inevitable burden of searching the subspace of payoffs, several techniques are adopted in this paper. Two example application problems arising from electricity markets and involving a Cournot and a Bertrand model, respectively, are investigated for verifying the proposed method.

• 대한전기학회논문지:전력기술부문A
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• 제54권1호
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• pp.38-42
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• 2005

Restructuring of the electric power industry has brought the issue of market competitiveness to surface. Recent years have witnessed the appearance of a particular seller or group of sellers exercising market power in electricity supply. In fact, much scholarly work has been done on how to identify and mitigate such abuse by market management rules. In this paper we assess the possible market power on the basis of pivotal supplier test and propose the method to determine the reasonable quantity of long-term contracts which can play a crucial role in mitigating the market power for a pivotal player. Furthermore the market efficiency is guaranteed by making long term contracts with a pivotal player up to the quantity to ensure that the pivotal player has no incentive to abuse the pivotal quantity in the electricity market.

• 한국콘텐츠학회논문지
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• 제6권4호
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• pp.136-145
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• 2006

본 연구는 Cr 투여가 태권도 선수들에게 발차기 횟수, 혈장요소 및 무산소성 파워에 어떠한 영향을 미치는지를 규명하기 위하여 수행되었다. 이를 위하여 남자 고등학교 태권도 선수를 대상으로 위약집단(n=9명), Cr 투여집단(n=9명)으로 구분하여 Cr을 투여한 결과 Cr 투여집단에서만 발차기 횟수, 혈장효소, 무산소성 파워(평균파워, 최대파워)에서 각각 유의하게 증가하였다. 이러한 결과들은 Cr 투여가 태권도 선수들에게 있어서 효과적인 영양 보조물 방법이고, 단기간의 Cr 투여로도 발차기 횟수의 향상에 긍정적인 영향을 미칠 수 있음을 확인할 수 있었다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (C)
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• pp.253-255
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• 2003

Electricity is the prime commodity in mobile device, e.g. smart phone, PDA, MP3 player and etc. This strict restriction on power consumption requirement of the mobile device puts unique demand in designing hardware and software components of the device. In this paper, we address the issue of minimizing the power consumption in retrieving the continuous media data from the disk drive for real-time playback purpose. Different from the legacy text based data, real-time multimedia playback requires that the storage supplies the data block continuous fashion. This may put immense burden on the power scarce environment since the disk Is required to be active for the entire playback duration. We develop elaborate algorithm which carefully analyzes the power consumption profile of the disk drive and which establishes the data retrieval schedule for the given playback. It computes the amount of data blocks to read, the length of active and standby period. According to our simulation result, the ARM algorithm exhibits superior performance in continuous media retrieval from the aspect of power consumption to legacy playback scheme.

• 전기학회논문지
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• 제57권1호
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• pp.34-39
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• 2008

Nash Equilibrium(NE) is essential to investigate a participant's bidding strategy in a competitive electricity market. Congestion on a transmission line makes it difficult to compute the NE due to causing a mixed strategy. In order to compute the NE of a multi-player game, some heuristics are proposed with concepts of a key player and power transfer distribution factor in other studies. However, generation capacity constraints are not considered and make it more difficult to compute the NE in the heuristics approach. This paper addresses an effect of generation capacity limits on the NE, and suggest a solution technique for the mixed strategy NE including generation capacity constraints as two heuristic rules. It is reported in this paper that a role of the key player who controls congestion in a NE can be transferred to other player depending on the generation capacity of the key player. The suggested heuristic rules are verified to compute the mixed strategy NE with a consideration of generation capacity constraints, and the effect of the generation constraints on the mixed strategy NE is analyzed in simulations of IEEE 30 bus systems.

• 한국정보과학회논문지:시스템및이론
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• 제35권11호
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• pp.517-526
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• 2008

휴대용 단말기의 기능은 점차 더 높은 사양의 멀티미디어를 처리할 수 있도록 진화하고 있다. 특히, 고화질의 동영상과 게임 등을 지원할 수 있는 높은 성능을 사용사의 끊임없는 요와 밀접하게 관련이 있다. 따라서 요구되는 높은 성능을 충족시키기 위한 휴대용 임베디드 시스템의 동작과정에서 전력소비는 기존보다 상대적으로 커지게 되었으며, 이 효율적으로 관리하는 전력 관리 기법이 필요하게 되었다. 본 논문에서는 휴대용 미디어 플레이어에서의 동적 전압 조절 알고리즘을 제안하고자 한다. 제안하는 알고리즘은 최근 프레임의 정보와 실행 시간 등을 적절한 크기의 윈도우로 유지하며 이를 기반으로 프로세서가 지원하는 (주파수, 전압)레벨을 조절하여 프로세서의 전력소비를 낮추게 된다. 이 알고리즘은 간단한 모듈 형태로 구현이 되었으며 일반적인 동영상 재생기에 손쉽게 추가시킬 수 있다. 성능 측정은 실제환경에서 많이 사용되고 있는 MPlayer를 사용하였으며 수행 결과, 최대 56%의 프로세서의 전력소비 감소 효과를 얻을 수 있었다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 춘계 종합학술대회 논문집
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• pp.191-200
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• 2005

본 연구는 Cr 투여가 태권도 선수들에게 운동 수행능력, 혈장요소 및 무산소성 파워에 어떠한 영향을 미치는지를 규명하기 위하여 수행되었다. 이를 위하여 남자 고등학교 태권도 선수를 대상으로 위약집단, Cr 투여 집단으로 구분하여 Cr을 투여한 후 Cr 투여는 태권도 선수들에게 있어서 효과적인 영양 보조물 방법이고, 단기간의 Cr loading으로도 운동수행력의 향상에 긍정적인 영향을 미칠 수 있음을 확인할 수 있었다.