• Journal of Digital Contents Society
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• v.13 no.1
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• pp.37-41
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• 2012

In this paper, we proposed FPGA algorithm for consider the power consumption. Proposed algorithm generated a feasible cluster by circuit partition considering the CLB condition within FPGA. Separated the feasible cluster reduced power consumption using glitch removal method. Glitch removal appled delay buffer insertion method by signal process within the feasible cluster. Also, removal glitch between the feasible clusters by signal process for circuit. The experiments results show reduction in the power consumption by 7.14% comparing with that of [9].

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.11
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• pp.821-827
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• 2001

A new low power charge-recycling ROM architecture is proposed. The charge-recycling ROM uses charge-recycling method in bit lines of ROM to save the power consumption. About 90% of the total power used in the ROM is consumed in bit lines. With the proposed method, power consumption in ROM bit lines can be reduced asymptotically to zero if the number of bit lines is infinite and the sense amplifiers detect infinitely small voltage difference. However, the real sense amplifiers cannot sense very small voltage difference. Therefore, reduction of power consumption is limited. The simulation results show that the charge-recycling ROM only consumes 13% ~ 78% of the conventional low power contact programming mask ROM.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.450-453
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• 2011

반도체 공정 기술의 발달에 따라 프로세서의 성능은 비약적으로 증가하였다. 특히 최근에는 하나의 프로세서에 여러 개의 코어를 집적한 멀티코어 프로세서 기술이 급속도로 발달하고 있는 추세이다. 멀티코어 프로세서는 동작주파수를 높여 성능을 개선하는 싱글코어 프로세서의 한계를 극복하기 위해 코어 개수를 늘림으로써 각각의 코어가 더 낮은 동작주파수에서 실행할 수 있도록 하여 소모 전력을 줄일 수 있다. 또한 다수의 코어가 동시에 연산을 수행하기 때문에 싱글코어 프로세서보다 더 많은 연산을 효율적으로 수행하여 사용률이 크게 높아지고 있지만 멀티코어 프로세서에서는 다수의 코어를 단일 칩에 집적하였기 때문에 전력밀도의 증가와 높은 발열이 문제가 되고 있다. 이와 같은 상황에서 본 논문에서는 듀얼코어 프로세서를 탑재한 시스템과 쿼드코어 프로세서를 탑재한 시스템의 소모 전력과 온도를 실제 측정하고 시뮬레이션을 통해 얻은 가상 시스템의 결과를 비교, 분석함으로써 실제 측정 결과와 시뮬레이션 결과가 얼마나 유사한지를 살펴보고, 차이가 발생하는 원인에 대한 분석을 수행하고자 한다. 실험결과, 실제 시스템을 측정한 결과와 시뮬레이션을 통한 가상 시스템의 결과는 매우 유사한 추이를 보이는 것으로 나타났다. 하지만 실제 시스템의 소모 전력과 온도의 증가비율은 가상 시스템의 소모 전력과 온도의 증가비율과는 다른 경향을 보이는 것을 확인하였다.

• Journal of KIISE:Computer Systems and Theory
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• v.27 no.2
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• pp.227-233
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• 2000

In this paper, we present a new high-level data path synthesis algorithm which solves the two design problems, namely, scheduling and allocation, with power minimization as a key design parameter. From the observations in previous works on data path synthesis for low power, we derive an integer programming (IP) formulation for the problem, from which we then develop an efficient heuristic to carry out the scheduling and allocation simultaneously. Our experimental results demonstrate that the proposed algorithm is very effective in saving power consumption of circuits significantly.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.8 no.4
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• pp.1-8
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• 2013

Entrepreneurial hope plays an important role in entrepreneurship, but theoretical and practical understanding of what it is and what it does is lacking. This study examined the effects of entrepreneurs' hope on their emotional exhaustion and psychological well-being. Psychological well-being was classified into three dimensions: self-acceptance, personal growth, and positive relationships. Data were collected from 156 CEOs of entrepreneurial firms. Results of this study indicated that entrepreneurs' hope was negatively related to emotional exhaustion, but positively related to self-acceptance, personal growth, and positive relationships. Results also indicated that emotional exhaustion was negatively related to self-acceptance, personal growth, and positive relationships. Finally, the theoretical and practical implications of the results were discussed.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.7
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• pp.703-707
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• 2008

This paper designs and implements a software prober to support a more effective power analysis for Linux-based embedded systems by using power consumption data measured in hardware. The proposed software prober, which is included in a target system as a module, collects power data and provides a service to discover major power consumers in user functions of applications or kernel functions through time synchronization between the power data measured in hardware and software. In addition, we verified usefulness of the implemented software prober by running user applications on target systems.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.124-127
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• 2017

선박에서 배출되는 환경오염 물질 및 온실가스에 대한 규제가 강화됨에 따라, 환경오염 물질 및 온실가스의 배출과 직접적으로 관련있는 연료 소모량을 줄이려는 다양한 연구가 진행되고 있다. 연료 소모량을 줄이기 위한 방안 중 하나는 환경 및 기상 예보를 이용하여 연료가 가장 적게 소모되는 항로를 찾는 것이다. 기존 연구에서는 연료 소모량을 주된 목적함수로 최소화 하되, 도착 시간에 대한 조건을 평가하기 위해 도착 시간의 기댓값을 계산하고 추가적인 목적함수로 고려하는 경우가 많았다. 그러나 선박 운항 예측 시 적용되는 환경 외란 정보는 상당한 불확실성을 포함하고, 이로 인해 발생하는 운항 속도 및 도착 시간에 대한 불확실성도 상당히 클 수 있기 때문에, 도착 시간의 기댓값뿐만 아니라 도착 시간에 대한 불확실성을 기반으로 제한 시간 내에 선박이 도착할 확률을 정량적으로 평가하는 것이 필요하다. 본 연구에서는 다목적 최적화 기법을 이용해 도착 시간의 기댓값과 연료 소모량에 대한 Pareto set을 구하되, 환경 외란으로부터 발생하는 도착 시간의 불확실성을 계산하여, 제한 시간 내에 선박이 도착할 확률을 계산하고 이를 항로 최적화 시 적용한다. 제안하는 방법의 유용성을 검증하기 위해 실제 환경에 가까운 맵을 기반으로 부산-도쿄 간의 항로를 최적화하고, 그 결과에 대해 논의한다.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.5
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• pp.315-321
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• 2009

Remote water meter monitoring is essential in U-city applications, whoγe digital water meter is a key component. While there are several kinds of water meters, the way to use has sensors has the merit of better preciseness, but the drawback of more power consumption. In this paper, we suggest an advanced sensing algorithm to diminish the power consumption while keeping the quality of preciseness. Our approach is to use less precise hall sensor for detecting the start of water impeller rotation with lower power consumption. During the rotation, a high precision hall sensor is used to meter the amount of water consumption. Our algorithm is analyzed to get 2 times lower power consumption than the previous algorithm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.1C
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• pp.149-156
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• 2004

In this paper, novel power-aware motion estimation is proposed for low-power multimedia communication. In the video compression, motion estimation dominates the total power consumption, where better performance usually requires more power consumption. Among several motion estimation algorithms with different performance and power, the proposed motion estimation adaptively selects the optimal algorithm during run-time, considering the trade-off between performance and power. The proposed motion estimation can be easily applied to various motion estimation algorithms with negligible computation or hardware overhead. According to simulation results, the proposed motion estimation reduces the power consumption to 1/15.7~1/5.6 without performance degradation, when compared to the conventional algorithms.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.6
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• pp.528-534
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• 2013

The energy consumption problem should be taken into consideration in wireless sensor network. Many studies have been proposed to address the energy consumption and delay problem. In this paper, we propose BISA(Bio-inspired Scheduling Algorithm) to reduce the energy consumption and delay in wireless sensor networks based on biological system. BISA investigates energy-efficient routing path and minimizes the energy consumption and delay using multi-channel for data transmission by multiplexing data transmission path. Through simulation, we confirm that the proposed scheme guarantees the efficient energy consumption and delay requirement.