• 한국경영과학회지
• /
• 제29권1호
• /
• pp.87-99
• /
• 2004

In this paper, we have developed a technology-service relationship model which describes the diffusion process of a group of services and relevant technologies, and have applied the developed model to the prediction of the number of subscribers to the next generation mobile service. The technology-service relationship model developed in this paper incorporates the developing process of relevant technologies, a supply-side factor, into the diffusion process of specific services, while many diffusion models and multi-generation diffusion models in previous researches are mainly reflect the demand-side factors. So, the proposed model could effectively applied to the telecommunication services where the developing of the relevant technologies are very essential to the service Penetration. In our application, the Proposed model provides a competitive substitution between the next generation mobile service and the traditional mobile service.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 하계학술발표대회 논문집
• /
• pp.1007-1012
• /
• 2008

Demand for the highly efficient and high performance urban energy supply system having been continuously increased according to the rise of quality of life and continuously increased energy cost all over the world. The district heating and cooling system is very effective way for energy saving, cost reduction, and demand side management of energy. There are several district cooling supply technologies such as chilled water direct transportation, installation of absorption type chiller in the user side, and desiccant cooling. This study investigates the advantage and technical problems of each district cooling technology. Also, it is necessary political and financial support system for the extension of district cooling system.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제54권8호
• /
• pp.387-394
• /
• 2005

This paper deals with the grid-interactive small battery energy storage system, which aims at the integration o( power quality improvement and demand side management. The main purpose of the proposed system is to achieve the peak power cutting and to compensate the current harmonics and reactive power at the point of installation on power distribution for residential homes. paper deals with the grid-interactive small battery energy storage system, In this paper, the basic principle and control algorithm is analyzed, theoretically and the design methodology of the system is discussed. To verify the proposed system, a comprehensive evaluation with theoretical analysis, simulation and experimental results for 1 KVA load capacity is presented.

• 한국산림과학회지
• /
• 제106권3호
• /
• pp.340-352
• /
• 2017

제5차 산림기본계획은 2008년부터 2017년까지의 10년 단위 계획으로, 2013년에 대외환경 변화 등의 이유로 변경되었다. 본 연구에서는 산림기본계획에 대한 거시적 평가를 위해 빅데이터 분석을 활용하여 연도별 정책 수요와 공급의 간극을 파악하였다. 정책수요 부분은 당해 연도의 뉴스, SNS 등에서 언급된 사업과 관련된 키워드(명사 기준)를 기준으로 하고, 정책 공급 부문은 산림청이 발행한 문서를 기준으로 하여 비정형 데이터를 수집하였다. 수집한 자료는 사회연결망 분석(social network analysis)을 활용하여 네트워크 구조를 특정하고, 수요 측면의 네트워크와 공급 측면의 네트워크를 비교하여 산림청 정책 수요와 공급의 간극을 확인한다. 분석 결과, 공급부문의 네트워크 구조는 수요 부문보다 방사형이 약한 것으로 나타나 산림 이외에 다양한 주제어가 네트워크에서 상당한 영향력을 행사하고 있는 것으로 판단되었다. 또한 27대 대표사업들을 대응한 33개 주제어에 대해 수요부문과 공급부문의 기울기를 비교한 결과, 수요는 증가하지만 공급이 감소하는 주제어의 개수는 7개로 지속가능, 산림경영, 산림생물, 산림보호, 산림병해충, 도시숲, 북한이 해당되었다. 이들 주제어는 수요와 공급의 간극이 확인된 만큼, 제6차 기본계획에서는 이들 주제어에 대한 공급 강화가 필요하며, 자유게시판 분석을 통하여 신규 임업인에 대한 정보 제공 및 교육 강화도 포함되어야 할 것으로 나타났다.

• 전기학회논문지
• /
• 제57권11호
• /
• pp.2117-2123
• /
• 2008

This paper describes the portal system architecture of large consumers for ESP(Energy Service Provider) to provide customers with various value added services such as monitoring and controlling a wide variety of electric devices in consumer's premises for optimal energy management from both consumer side and ESP side, and the prototype implementation of 2 kinds of value added services. The architecture is composed of the device portal which gathers the information from electric devices and controls them and the consumer portal which can make ESP operate the optimal energy management with two-way communications. The demand side management and energy management functions was chosen and implemented for the prototype system as value added services. The prototype was designed to create, manage, and trace the events about services between ESP and customers.

• Journal of Communications and Networks
• /
• 제14권6호
• /
• pp.662-671
• /
• 2012

Plug-in hybrid electric vehicles (PHEVs) will be widely used in future transportation systems to reduce oil fuel consumption. Therefore, the electrical energy demand will be increased due to the charging of a large number of vehicles. Without intelligent control strategies, the charging process can easily overload the electricity grid at peak hours. In this paper, we consider a smart charging and discharging process for multiple PHEVs in a building's garage to optimize the energy consumption profile of the building. We formulate a centralized optimization problem in which the building controller or planner aims to minimize the square Euclidean distance between the instantaneous energy demand and the average demand of the building by controlling the charging and discharging schedules of PHEVs (or 'users'). The PHEVs' batteries will be charged during low-demand periods and discharged during high-demand periods in order to reduce the peak load of the building. In a decentralized system, we design an energy cost-sharing model and apply a non-cooperative approach to formulate an energy charging and discharging scheduling game, in which the players are the users, their strategies are the battery charging and discharging schedules, and the utility function of each user is defined as the negative total energy payment to the building. Based on the game theory setup, we also propose a distributed algorithm in which each PHEV independently selects its best strategy to maximize the utility function. The PHEVs update the building planner with their energy charging and discharging schedules. We also show that the PHEV owners will have an incentive to participate in the energy charging and discharging game. Simulation results verify that the proposed distributed algorithm will minimize the peak load and the total energy cost simultaneously.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2005년도 하계학술발표대회
• /
• pp.65-65
• /
• 2005

• 한국에너지공학회:학술대회논문집
• /
• 한국에너지공학회 2001년도 춘계 학술발표회 논문집
• /
• pp.183-188
• /
• 2001

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2007년도 하계학술발표대회 논문집
• /
• pp.64-64
• /
• 2007

• 디지털융복합연구
• /
• 제8권2호
• /
• pp.103-114
• /
• 2010

영화산업을 정확히 이해하기 위해서는 공급측면 뿐만 아니라 수요측면도 분석할 필요가 있다. 이 연구는 한국영화산업에서 1991-2008년까지의 수요측면 변수(영화 관람료, 근로일수, 근로시간, 개인소득, 프로스포츠 관중, 케이블 TV, 개봉영화편수, 스크린 수)를 분석하였다. 수요의 법칙에 따르면 가격의 인상은 수요의 감소를 가져오는데, 연구결과, 영화 관람료 인상과 영화 관객 증가가 함께 이루어졌다 영화에 대한 수요는 소득수준 및 여가시간과 갚은 상관관계를 보여 주였다. 여가와 소득의 증가는 영화에 대한 수요를 높였다. 한편, 프로스포츠가 활성화되면 영화에 대한 수요가 줄어들 것으로 기대되었으나 여가시간 증가와 함께 영화 및 스포츠 관람이 동시에 늘었다. 다양한 장르의 영화가 개봉되면 사람들의 다양한 취향을 만족시켜 영화 관람객이 늘어날 것으로 예상되었으나 실제로는 그렇지 않았다. 한편, 복합상영관 형태의 스크린 수는 영화관객의 수와 상관관계가 높았다.