• Advances in Energy Research
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• 제7권1호
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• pp.35-52
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• 2020

The paper proposes a hybrid approach of artificial bee colony (ABC) and grey wolf optimizer (GWO) algorithm for multi-objective and multidimensional engine optimization of a converted plug-in hybrid electric vehicle. The proposed strategy is used to optimize all emissions along with brake specific fuel consumption (FC) for converted parallel operated diesel plug-in hybrid electric vehicle (PHEV). All emissions particulate matter (PM), nitrogen oxide (NOx), carbon monoxide (CO) and hydrocarbon (HC) are considered as optimization parameters with weighted factors. 70 hp engine data of NOx, PM, HC, CO and FC obtained from Oak Ridge National Laboratory is used for the study. The algorithm is initialized with feasible solutions followed by the employee bee phase of artificial bee colony algorithm to provide exploitation. Onlooker and scout bee phase is replaced by GWO algorithm to provide exploration. MATLAB program is used for simulation. Hybrid ABC-GWO algorithm developed is tested extensively for various values of speeds and torque. The optimization performance and its environmental impact are discussed in detail. The optimization results obtained are verified by real data engine maps. It is also compared with modified ABC and GWO algorithm for checking the effectiveness of proposed algorithm. Hybrid ABC-GWO offers combine benefits of ABC and GWO by reducing computational load and complexity with less computation time providing a balance of exploitation and exploration and passes repeatability towards use for real-time optimization.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.775-782
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• 2004

Recently, the cases which are constructed close by neighboring structure or underground structure are on the increase to get the utmost out of the land exploitation of underground space in the downtown area. As the building becomes larger, the excavation depth is getting deep, and the excavation area is getting, wide too. These are frequent occasions that the application of Strut or Anchor method is difficult, because of site boundary, civil application and the ground condition. Therefore, to solve these problem, we analyze and compare design with measuring data, change the design factor and show the improvement of course through the application of self-supported diaphragm wall using counterfort technique which is a new method. It is expected to be a contribution to the suitable exploitation method of construction.

• Journal of Communications and Networks
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• 제16권3호
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• pp.280-292
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• 2014

This article presents a novel cooperative spectrum sharing (CSS) scheme. The primary transmitter transmits a complex Quadrature amplitude modulation (QAM) signal in the first phase, and CSS occurs in the second phase. The secondary transmitter with the largest forwarding channel gain among the nodes that successfully decode the primary signal in the first phase is selected for CSS. This selected node employs a pulse-amplitude modulation (PAM) signal for primary information message (IM) instead of the QAM signal, and it employs a modified PAM signal for the secondary IM. The proposed modified PAM signal depends on the amplitude of the primary PAM signal. This method results in no mutual interference and negligible primary interference constraint and allows a higher degree of exploitation of spatial diversity, thus enabling increase in secondary power to improve primary transmission. The outage performance is enhanced in both the primary and secondary systems. The critical region, in which the primary outage performance is enhanced with the proposed CSS scheme, can be adjusted and widened by varying either the modulation cooperation sharing factor or the number of secondary transmitters.

• Ocean and Polar Research
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• 제29권2호
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• pp.165-185
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• 2007

Exploitation of transboundary oil and gas on continental shelves may cause conflicts between or among States concerned due to the physical character of these resources. As oil and gas are fluid, exploitation of such a transboundary oil field by one side may affect other parties in other jurisdictions. However, there is no universal international legal regime on the issue. This article tries to find the international legal regime governing such resources through analysing UN Assembly's resolutions, UNCLOS, international judicial opinions, bilateral agreements and ILC activities relating to transboundary natural resources. As a result of this study, it seems that each coastal State has an inherent sovereign right on its part of the transboundary oil and gas deposit, but this right is not unlimited. Each state involved with the deposit has a duty to cooperate with other states-through information exchange, consultation, and negotiation. Furthermore, the state has an obligation to refrain from unilateral action when there is a possibility of causing irrevocable damage to the interests of the other states.

• 지식경영연구
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• 제10권4호
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• pp.163-183
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• 2009

Numerous studies in the field of buyer-supplier relationship research have focused on the buyer's performance. In contrast, supplier's performance has been paid relatively little attention by researchers, especially the research about the supplier's innovation in the relationship is still in its early stage. In this paper, we examine the relation between the attribute of buyer-supplier relationship and the attribute of supplier's innovation through case research. We define the attribute of buyer-supplier relationship as 'tie strength' (Granovetter, 1973), and the attribute of supplier's innovation as 'exploitation or exploration' (March, 1991). We selected the semiconductor equipment industry of U.S.A, Japan and Korea and firm (JUSUNG Engineering) as cases that examine the relation. We found that a strong tie relationship is positively associated with supplier's exploitation based innovation, and a weak tie relationship is positively related to it's exploration based innovation in this research also. In addition, we could verify reduction of strong tie relationship cause supplier's organizational change.

• The Journal of Asian Finance, Economics and Business
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• 제8권4호
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• pp.307-315
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• 2021

The study aims to investigate the relationship between innovation activities and business process performance in higher education institution (hereinafter referred to as "HEI") context. The data was collected using a survey and later analyzed through Partial Least Squares Structural Equation Modelling (PLSSEM) and SmartPLS software. A total of 50 questionnaires were submitted from respondents representing vocational study program management located in Makassar, Indonesia. The findings show that two hypotheses discussed in this study fit the empirical data. Specifically, the results show that there is a positive relationship between innovation activities and business process performance, involving two types of innovation activities, which are exploration activities and exploitation activities, within HEIs. Explorative activity is firmly related to exploitative activity, which furthermore links to business process performance within the HEIs observed. The results confirm that exploration activity can stimulate and lead the HEIs management to generate exploitation activity. For instance, capabilities to absorb knowledge from the external institution may lead this institution to generate advanced academic processes, as well as more efficient and effective managerial processes. The study also signifies ambidexterity capacity, suggesting that it may lead HEIs management to formulate proper strategies in achieving better performance and gaining competitive advantage.

• Nuclear Engineering and Technology
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• 제54권10호
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• pp.3864-3877
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• 2022

We propose a new approach called PESA (Prioritized replay Evolutionary and Swarm Algorithms) combining prioritized replay of reinforcement learning with hybrid evolutionary algorithms. PESA hybridizes different evolutionary and swarm algorithms such as particle swarm optimization, evolution strategies, simulated annealing, and differential evolution, with a modular approach to account for other algorithms. PESA hybridizes three algorithms by storing their solutions in a shared replay memory, then applying prioritized replay to redistribute data between the integral algorithms in frequent form based on their fitness and priority values, which significantly enhances sample diversity and algorithm exploration. Additionally, greedy replay is used implicitly to improve PESA exploitation close to the end of evolution. PESA features in balancing exploration and exploitation during search and the parallel computing result in an agnostic excellent performance over a wide range of experiments and problems presented in this work. PESA also shows very good scalability with number of processors in solving an expensive problem of optimizing nuclear fuel in nuclear power plants. PESA's competitive performance and modularity over all experiments allow it to join the family of evolutionary algorithms as a new hybrid algorithm; unleashing the power of parallel computing for expensive optimization.

• 한국전자거래학회지
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• 제19권4호
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• pp.101-117
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• 2014

본 연구의 목적은 기업가정신과 동적역량 간의 관계분석을 통해 조직유효성에 미치는 영향을 알아보고, 나아가 조직유효성 향상 방안에 대해서 연구하는 것이다. Teece(2002)의 동적역량의 이론을 토대로 조사하였으며, 이에 따른 세부항목을 연구하여 연구 모형을 수립하였다. 본 연구의 가설은 다음과 같이 설정하였다. 첫째, 기업가정신은 동적역량에 유의한 영향을 미칠 것이다. 둘째, 동적역량은 조직유효성에 유의한 영향을 미칠 것이다. 설문은 IT 벤처기업에 재직 중인 임직원을 대상으로 설문조사를 실시하여 412부를 분석에 사용하였다. 본 연구의 결과는 다음과 같다. 기업가정신과 동적역량 간의 관계가 조직유효성에 유의미한 영향을 미치고 있다. 특히 조직에서 동적역량의 융합탐색역량이 조직유효성에 높은 영향력을 미치는 것으로 밝혀졌다. 이에 CEO는 조직구성원들에게 동적역량의 융합탐색역량을 적극적으로 개발하고 조직유효성에 영향력을 행사하고 있는지 고려해 볼 필요가 있다.

• 벤처창업연구
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• 제4권3호
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• pp.1-22
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• 2009

기업의 경쟁력은 기업 특유의 지식이 많을수록 강해진다. 기업 특유의 지식이란 그 기업만이 가지고 있는 고유의 지식을 말한다. 최근 들어 고유의 지식을 축적하고 경쟁력을 갖추기 위해서 어떻게 해야 할 것인가에 대한 연구들이 다양한 관점에서 진행되고 있다. 본 연구는 지식경영이론 관점에서 기존 이론에 대한 고찰을 총해 흡수능력 축적과정에 대한 개념적 틀을 도출하고, LCD 장치산업의 중소기업을 대상으로 하여 신제품개발 과정에 대한 사례분석을 통해서 기술능력 축적에 방법에 대한 명제를 도출하고 의의와 시사점을 제시하고 있다. 연구 결과 중소기업이 신속하게 기술능력을 축적하기 위해서는 흡수 능력의 3요소인 기반능력, 통합능력, 노력의 강도를 갖추어야 하며, 특히 노력의 강도가 중요한 역할을 한다. 또한 혁신적인 수준의 신제품을 개발하기 위해서는 탐험과 활용을 통한 학습 가속화가 요구되며, 적극적인 탐색과 탐험을 위해서는 이에 필요한 보완능력의 구축이 요구된다.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2009년도 통합학술대회
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• pp.67-88
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• 2009

기업의 경쟁력은 기업 특유의 지식이 많을수록 강해진다. 기업 특유의 지식이란 그 기업만이 가지고 있는 고유의 지식을 말한다. 최근 들어 고유의 지식을 축적하고 경쟁력을 갖추기 위해서 어떻게 해야 할 것인가에 대한 연구들이 다양한 관점에서 진행되고 있다. 본 연구는 지식경영이론 관점에서 기존 이론에 대한 고찰을 통해 흡수능력 축적과정에 대한 개념적 틀을 도출하고, LCD 장치산업의 중소기업을 대상으로 하여 신제품개발 과정에 대한 사례분석을 통해서 기술능력 축적에 방법에 대한 명제를 도출하고 의의와 시사점을 제시하고 있다. 연구 결과 중소기업이 신속하게 기술능력을 축적하기 위해서는 흡수 능력의 3요소인 기반능력, 통합능력, 노력의 강도를 갖추어야 하며, 특히 노력의 강도가 중요한 역할을 한다. 또한 혁신적인 수준의 신제품을 개발하기 위해서는 탐험과 활용을 통한 학습 가속화가 요구되며, 적극적인 탐색과 탐험을 위해서는 이에 필요한 보완능력의 구축이 요구된다.