• Animal cells and systems
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• 제13권1호
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• pp.91-96
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• 2009

The size of song repertoires mainly provides evidence for explaining sexual selection for female choice as well as male-male competition. We investigated the role of oriental great reed warbler songs (Acrocephalus orientalis) of breeding territorial males. Early arrived males possessed larger song repertoires, paired earlier, and tended to become polygynous. No correlation was found between arrival date and territory size, but polygynous males significantly occupied larger territories than non polygynous males. Song sharing was low among males and the degree of similarity did not relate with spatial distance. Our results suggest that song repertoire of the oriental great reed warbler males play a role in female choice, where territory quality may affect male pairing success.

• Journal of Information Technology Applications and Management
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• 제21권4_spc호
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• pp.485-499
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• 2014

Sharing Economy is the modern main item with ICT Development. Of course sharing economic item is the old and long run mainstream, but by the ICT technological development sharing economy is the fostering and affluent factors in the world economic growth. Though, in Korea, till now sharing economy is minimal, that will growth sharply. We can track various business models of sharing economy. Sharing economy is to buy use right not ownership. With the sharing economic business model wee can make also financial sharing model. In finance model we can divide two kind models. First, we can trace small size lending model with p2p type. And second, we can make financial information transaction model. But till now sharing economic system is not activated, because of many reasons. To activate, first we have to set law and various standards, and also government actively support many sharing economy firms and institutions. To catch up developed countries in the field of sharing economy we have to make aggressive and flexible rules and standards.

• Journal of Information Technology Applications and Management
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• 제20권4호
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• pp.19-31
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• 2013

There is tremendous increasing demand on spectrum resource which is boosted by spread of cloud computing and M2M telecommunication as well as smart phone and tablet PC. Recently, spectrum sharing technology has drawn attention to the spectrum policy makers as a promising way to overcome limitation of scarce spectrum resource. To succeed in commercialization of spectrum sharing technology, it is necessary to prospect the future business ecosystem of spectrum sharing and develop appropriate policies and laws at the same time along with the advance of spectrum sharing technology. The purpose of this paper is to prospect future spectrum sharing ecosystem and analyze business ecosystem of spectrum sharing with casual loop map. With the causal map and system dynamics method, it is possible to analyze feedback loops which is not limited to linear thinking and build policies which optimize positive dynamics in business ecosystem of spectrum sharing.

• 산업융합연구
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• 제7권2호
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• pp.45-57
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• 2009

I first present a set of features for distinguishing group learning from other concepts. I then develop a framework for understanding group learning that focuses on learning's basic processes at the group level of analysis: sharing.

• 한국인터넷방송통신학회논문지
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• 제12권5호
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• pp.275-281
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• 2012

스마트폰의 대중화로 모바일기기에서의 음악을 듣기 위한 스트리밍 서비스가 주요시 되고 있다. 애플 iOS에서는 Apple의 HTTP Live Streaming 방식을 사용하고 안드로이드에서는 RTSP(Real-time Streaming Protocol) 방식을 사용한다. 모바일 실시간 스트리밍을 지원하기 위해 와우자 미디어 서버를 사용하게 되는데, 이는 애플과 안드로이드 모바일 스트리밍 모두를 지원한다. 본 논문에서는 스마트폰 자체의 녹음 기능을 통해 유저 스스로가 노래를 녹음하고, 이를 스트리밍 서버에 업로드 하여 유저가 선택한 노래를 실시간으로 스트리밍 모바일 재생 서비스가 가능하고, 노래공유 SNS 기능을 제공하는 스마트폰 앱의 설계 및 구현에 대해 기술하고자 한다.

• ETRI Journal
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• 제34권3호
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• pp.308-318
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• 2012

As mobile markets in most developed countries are rapidly coming close to saturation, it is increasingly challenging to cover the cost of providing the network, as revenues are not growing. This has driven mobile operators, thus far mostly involved in facility-based competition, to turn their attention to network sharing. There exist various types of mobile network sharing (MNS), from passive to active sharing. In this paper, we propose a model, based on the supply-demand model, for evaluating the economic effects of using six types of MNS. Our study measures the economic effects of employing these six types of MNS, using actual WiBro-related data. Considering lower service price and expenditure reduction, the total economic effect from a year's worth of MNS use is estimated to be between 513 million and 689 million USD, which is equal to three to four percent of the annual revenue of Korean mobile operators. The results of this study will be used to support the establishment of a MNS policy in Korea. In addition, the results can be used as a basic model for developing various network sharing models.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권2호
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• pp.85-90
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• 2012

This paper presents a topology structure and control method for an input-parallel-output-series(IPOS) inverter system which is suitable for high input current, high output voltage, and high power applications. In order to ensure the normal operation of the IPOS inverter system, the control method should achieve input current sharing(ICS) and output voltage sharing(OVS) among constituent modules. Through the analysis in this paper, ICS is automatically achieved as long as OVS is controlled. The IPOS inverter system is controlled by a three-loop control system which is composed of an outer common-output voltage loop, inner current loops and voltage sharing loops. Simulation results show that this control strategy can achieve low total harmonic distortion(THD) in the system output voltage, fast dynamic response, and good output voltage sharing performance.

• 지식경영연구
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• 제18권4호
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• pp.261-286
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• 2017

Key factors enhancing transfer behavior of training and knowledge sharing are of great interest to researchers and executives because training transfer and knowledge sharing activities are remarkable predictors of organizational growth. This study investigates the core motivations for boosting transfer behavior of training and knowledge sharing. To empirically test the impacts of employee training, servant leadership and self-efficacy, a survey was conducted in small-medium sized companies. The data (N=292) were analyzed using structural equation modeling analysis. The results indicate that higher employee training positively leads to self-efficacy and transfer behavior of training. Servant leadership is positively leads to self-efficacy, transfer behavior of training, and knowledge sharing. Self-efficacy of employees induces greater transfer behavior of training and knowledge sharing. Finally, transfer behavior of training encourages workers to increase knowledge sharing. This study represents an initial step to examine the psychological mechanism of improving employees' transfer behavior of training and knowledge sharing activities based on the employee training qualities and servant leaderships.

• 국제지역연구
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• 제13권2호
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• pp.89-115
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• 2009

본 연구는 EU 회원국들의 소비위험분산 행위를 살펴보기 위해 기존의 소비위험분산 측정방법에 소위 이례적 관측치 (outlier)를 고려하여 기법을 도입하고 있다. 본 연구는 단순히 소비위험분산을 측정하는 기존의 방법에서 더 나아가 어느 국가 혹은 지역들이 소비위험분산에 특히 더 기여하는지를 밝히고자 한다. 이를 위해 기존 계량경제학의 회귀분석에서 간과되었던 특정 관측치의 회귀분석결과에 대한 영향력 분석을 DFFITS와 DFBETAS 접근법을 사용하였다. 이같은 소비위험분산 측정 결과 EU 지역의 소비위험분산 정도는 서유럽국가와 비교적 최근에 EU에 가입한 동유럽국가로 크게 이분되어 있음을 발견하였다.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2012년도 춘계학술대회
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• pp.11-12
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• 2012