• International Journal of Advanced Culture Technology
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• 제1권2호
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• pp.18-23
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• 2013

In this paper, we consider the problem of designing optimal sensing time and the minimization of energy consumption in the Cognitive radio Network. Trade-off between throughput and the sensing time are observed, and the equations are derived for the optimal choice of design variables. In this paper, we also look at the optimization problem involving all the design parameters together. The advantages of the proposed scheme for the spectrum sensing and access process are shown through simulation.

• ETRI Journal
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• 제37권4호
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• pp.804-812
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• 2015

Energy harvesting (EH) technology in the field of wireless sensor networks (WSNs) is gaining increasing popularity through removing the burden of having to replace/recharge depleted energy sources by energy harvester devices. EH provides an alternative source of energy from the surrounding environment; therefore, by exploiting the EH process, WSNs can achieve a perpetual lifetime. In view of this, emphasis is being placed on the design of new medium access control (MAC) protocols that aim to maximize the lifetime of WSNs by using the maximum possible amount of harvested energy instead of saving any residual energy, given that the rate of energy harvested is greater than that which is consumed. Various MAC protocols with the objective of exploiting ambient energy have been proposed for energy-harvesting WSNs (EH-WSNs). In this paper, first, the fundamental properties of EH-WSN architecture are outlined. Then, several MAC protocols proposed for EH-WSNs are presented, describing their operating principles and underlying features. To give an insight into future research directions, open research issues (key ideas) with respect to design trade-offs are discussed at the end of this paper.

• The Journal of Asian Finance, Economics and Business
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• 제7권10호
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• pp.555-569
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• 2020

This study examines the impact of corporate tax, a fiscal measure along with trade liberalization and research and development on total factor productivity for a panel of 153 industrial firms listed on the Pakistan Stock Exchange over the period 1997-2017. For empirical analysis, we employ the system generalized method of moment estimator. In the first step, we estimate industrial production function and the results reveal that raw material, industrial labour force and energy play vital role in enhancing industrial production. Whereas, industrial capital exerts negative impact on industrial output. We also measured total factor productivity using the production elasticities. In the second step, we examine the impact of corporate tax, trade liberalization and research and development on total factor productivity. The results indicate that higher level of corporate tax exerts negative impact on total factor productivity. The findings reveal that higher corporate taxation discourages industrial firms to undertake research and development thereby exerting adverse impact on total factor productivity of firms. The impact of trade liberalization proxied by average tariff is positive while customs duty and sales tax negatively impact firm-level total factor productivity. These findings provide useful insights for managers, investors and policy makers in Pakistan.

• 무역학회지
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• 제48권1호
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• pp.165-191
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• 2023

미국과 EU는 우크라이나 사태에 대응하여 러시아의 에너지 부문을 대상으로 제재하고 있다. 특히 대러 경제제재는 러시아의 석유가스 부문에 대한 에너지 제재의 성격을 가지고 있다. 미국과 EU는 모두 제재 부과국이지만, 미국은 천연가스 순수출국인 반면, 대부분의 EU 회원국들은 러시아에 대한 의존도가 높다는 근본적인 차이점이 존재한다. 따라서 미국과 EU의 대러 에너지 제재는 미국을 포함한 기타 석유가스 수출국들이 EU 에너지 시장에서 러시아를 대체할 공급을 확보할 수 있는 경우에 그 효과성이 보장될 수 있다. 즉, 주요 석유가스 수출국들의 러시아 대체 가능성은 대러 에너지 제재의 효과성을 좌우하는 중요한 결정 요인이다. 본 연구는 석유가스 수출국들의 러시아 대체 가능성 평가를 통해 대러 에너지 제재의 효과성을 살펴본다. 본 연구의 분석 결과, 대부분의 석유가스 수출국들의 추가 생산 역량과 인프라 부족 문제로 인해 단기에 러시아를 대체하는 석유가스의 확보는 어려울 것으로 평가되며, 이에따라 미국과 EU의 대러 에너지 제재는 그 효과성이 불분명한 것으로 판단된다. 우크라이나 사태의 해결을 위해서는 직접적인 제재보다 외교 등 다른 수단이 활용되어야 할 것이다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1996년도 춘계학술발표회 초록집
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• pp.144-150
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• 1996

The Energy Efficiency Standards and Labelling Act, as amended by the Rational Energy Utilization Act, provides energy efficiency standards and labellings for six equipment categories(viz, refrigerators, air-conditioners, fluorescent lamps and ballasts, incandescent lamps, cars) authorizes the Ministry of Trade. Industry and Energy (MOTIE) to prescribe amended or new energy efficiency standards and labelling standards. This study was initiated by the KIER(Korea Institute of Energy Research) in 1992. KIER's assessment of the appliance energy efficiency standards is designed to evaluate their statistical and engineering analysis according to Korean Industrial Standards(KS). And to make didtinction between the poor efficiency and good efficiency models. 5 grades are classified depending on their tested energy efficiency. This year, based on our analysis, MOTIE mandated updated standards for refrigerators, air-conditioners, Incandescent lamps, and fluorescent lamps.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.418-421
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• 2009

Renewable energy or green energy is a hot issue in theses days. Since wind resource can be endlessly supplied by nature, researchers and common people are interested in study how to use that resource at home or company. Especially, many architects have tried to integrate wind power generator for a part of building. So in this paper, three buildings installed wind power turbine are targed to CFD analysis and these buildings are Bahrain trade center, Discovery tower, and Pearl river tower. Bahrain trade center is the first builidng installed real wind turbine, Discovery tower is constructing at Texas, and Pearl river tower is designed and proved by china researchers. These buildings have very different type of wind power turbine and each turbine has different conditions for best power generation. Therefor this paper will focus on characteristic shape of buildings, wind power turbine type, and expected purpose of construction. Moreover, CFD analysis will show wind flow pattern and wind speed while wind is passing through wind turbine of three tall buildings. CFD analysis for three buildings make comparison the wind flow patterns with experimental result.

• 무역학회지
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• 제47권5호
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• pp.1-20
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• 2022

As a part of environmental pollution mitigation in China, the number of environmentally friendly vehicles in China is proliferating, attention to vehicles that use environmentally friendly energy continues to increase, and China's new energy vehicle market is also growing rapidly. Similar to existing research, the focus of the subsidy is to provide financial support for electric vehicle buyers and the expansion of new energy vehicle charging infrastructure. Under these circumstances, this study attempts to understand the influence of Chinese consumers' green responsibility and other psychological factors on electronic vehicle purchase intention based on norm activation theory and theory of planned behavior. PLS-SEM examined the proposed hypotheses with 369 valid Chinese consumers, and all were supported. Our findings contribute to the extension of the research scope of Chinese consumers' intention to purchase electric vehicles and provide practical information for domestic and foreign firms entering China, the world's largest electric vehicle market.

• 한국콘텐츠학회논문지
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• 제17권7호
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• pp.487-497
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• 2017

우리나라도 기술이나 영업비밀이 유출되는 사례가 빈번히 발생하면서 분쟁해결 시스템의 정비도 필요하게 되었다. 첫째, 관련 개별 법률을 제정 시행하면서 다양한 법률이 분산되어 제정 시행되어, 중복성의 문제, 개별 법률 간의 충돌, 포괄성 통합성 연계성 저하의 문제가 되고 있다. "기술유출방지 및 보호지원에 관한 법률"(가칭)체계로 독립적인 법체계가 필요하다. 이렇게 함으로써 현재, 중소기업청, 산업통상자원부, 특허청, 공정거래위원회, 무역위원회, 경찰청, 국정원 등 정부부처별로 분산되어 있는 기술보호지원제도를 제도적으로는 통합화 일원화하되, 기능적으로 분담을 통하여 정책을 추진할 필요성이 있다. 둘째, 특허법상의 '특허심판원', 발명진흥법상 '산업재산권분쟁조정위원회', 산업기술의 유출방지 및 보호에 관한 법률상의 '산업기술분쟁조정위원회', 중소기업기술보호지원에 관한 법률상, '중소기업기술분쟁조정 중재위원회'가 설치되어 있으나, '기술유출방지 및 보호 지원에 관한 법률'(가칭) 통합법을 제정하면서 중소기업청, 혹은 산업통상자원부 산하에 '기술분쟁심판조정위원회'(가칭)로 통폐합 설치 운영 두는 방안이 바람직하다.

• Journal of Communications and Networks
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• 제12권2호
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• pp.150-157
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• 2010

Understanding and optimizing the energy consumption of wireless devices is critical to maximize the network lifetime and to provide guidelines for the design of new protocols and interfaces. In this work, we first provide an accurate analysis of the energy performance of an IEEE 802.11 WLAN, and then we derive the configuration to optimize it. We further analyze the impact of the energy configuration of the stations on the throughput performance, and we discuss under which circumstances throughput and energy efficiency can be both jointly maximized and where they constitute different challenges. Our findings are that, although an energy-optimized configuration typically yields gains in terms of throughput as compared against the default configuration, it comes with a reduction in performance as compared against the maximum-bandwidth configuration, a reduction that depends on the energy parameters of the wireless interface.

• 신재생에너지
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• 제7권1호
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• pp.8-14
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• 2011

As is the case in Korea, the expansion of renewable energy dissemination is an essential matter in Ukraine when considering its energy consumption and dependence on energy import. While Korea has set about promoting the new and renewable energy industry on the back of the national policy on green growth, Ukraine expects a virtuous circle of renewable energy industry with green tariffs and the attraction of foreign capital in association with carbon emission trade. Utilizing its well-developed heavy industrial sector including the shipbuilding and automobile industries, Korea expects wind turbine manufacturing to become one of its next-generation growth engines. Ukraine is also trying to enter the wind turbine system or parts manufacturing industry based on its automobile industry and advanced aerospace technology. Although the Crimean region in Ukraine seems to have excellent wind resources, and thus shows great potential as a location for wind farm development, political instability has been a major obstacle to the attraction of foreign capital, leading to delayed investment.