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녹색물류기업 인증제도의 기대성과에 관한 연구 : 물류기업 특성별 녹색물류성과 차이 분석
김영민 한국국제상학회 2013 國際商學 Vol.28 No.2
This study aims at analyzing a gap of expected performance of certificate system of green logistics company in accordance with the characteristics of logistics company, and stating its implication for extending green logistics. It investigates what extent employees in logistics company expect green logistics performance such as logistics performance, environmental performance, corporate performance and resource performance subject to the characteristics of logistics company - certification acquisition, perception of certificate system, investment of green logistics, other certification related with logistics, number of countries on business, number of employees and size of sales. To conduct the analysis of the gap of expected performance, not only was the survey to employees of logistics companies conducted, but factor analysis, reliability analysis, one-way ANOVA and t-test were applied. As a result, the study indicates meaningful difference of expected performance is addressed as follows: certification acquisition and size of sales are shown difference to logistics performance; perception of certificate system, investment of green logistics, number of employees and size of sales are subject to environmental performance; certification acquisition, perception of certificate system, other certification related with logistics, number of employees and size of sales are significant gap to corporate performance; and certification acquisition, perception of certificate system, investment of green logistics, number of employees are also subject to resource performance.
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Layered Turbo codes combined with space time codes for satellite systems
김영민,김수영,Kim, Young-Min,Kim, Soo-Young Korea Society of Satellite Technology 2010 한국위성정보통신학회논문지 Vol.11 No.1
계층적 부호화 방식은 멀티미디어 방송 및 멀티캐스팅 서비스(multimedia broadcasting and multicasting services; MBMS)등과 같이 단방향의 서비스에서 신호 품질에 대한 피드백 정보의 활용이 어려울 경우 사용할 수 있는 적응형 수신 기법 중의 하나이다. 이 기술은 계층적 변조 방식과 결합하여 사용함으로써, 부호화율과 변조 방식을 적절하게 결합하여 사용할 수 있는 방식이다. 또한, 터보부호와 결합된 시공간부호를 이용하여 멀티미디어 방송 서비스 제공에 있어서 위성-지상 통합망에서 효과적으로 다이버시티 이득을 얻을 수 있음이 보여왔다. 본 논문에서는 계층적 터보 부호와 결합된 시공간 부호화 방식을 위성-지상 통합 망에 적용하는 방안을 제시한다. 먼저, 시스템 구조 및 동작 원리를 설명하고, 실제 적용 예제들을 제시한다. A layered coding scheme is one of the adaptive receiving techniques for unidirectional services such as multimedia broadcasting and multicasting services (MBMS), where we cannot utilize feedback information. The layered coding scheme can be used with hierarchical modulations by combining suitable code rates and modulation orders of each. In addition, it has been reported that hybrid and/or integrated satellite systems can effectively achieve transmit diversity gains by appropriate utilization of space time coding combined with turbo codes. This paper proposes a layered turbo coding schemes for hybrid and/or integrated satellite systems. We first introduce the system architecture and operational principle of the proposed scheme, and discuss the applicability.
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