• Korean Journal of Construction Engineering and Management
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• v.2 no.1 s.5
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• pp.98-106
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• 2001

The Ministry of Education and Human Resource Development has implemented the Construction Cost Saving Policy since 1998. The National Universities and Regional Education Committee have been required to follow the details of the Policy in constructing educational facilities in their jurisdiction. While the Policy has positive effect on construction cost saving of the entities, it has been criticized from the beginning of the Policy implementation because of its negative impact on project quality, education quality, trust in the public sector construction business, and solvent operation of the private construction companies which build the educational facilities in the entities. The research aims at investigating the pitfalls of the Policy and suggesting more reasonable approaches that can satisfy both the governmental entities and the private companies.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.8
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• pp.3435-3454
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• 2016

Device-to-device (D2D) communication is a potential solution to the incessant increase in data traffic on cellular networks. The greatest problem is how to control the interference between D2D users and cellular mobile users, and between D2D users themselves. This paper proposes a solution for this issue by putting the full control privilege in cellular network using the software-defined networking (SDN) concept. A software virtual switch called Open vSwitch and several components are integrated into mobile devices for data forwarding and radio resource mapping, whereas the control functions are executed in the cellular network via a SDN controller. This allows the network to assign radio resources for D2D communication directly, thus reducing interference. This solution also brings out many benefits, including resource efficiency, energy saving, topology flexibility, etc. The advantages and disadvantages of this architecture are analyzed by both a mathematical method and a simple implementation. The result shows that implementation of this solution in the next generation of cellular networks is feasible.

• Journal of Information Technology Applications and Management
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• v.27 no.1
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• pp.111-123
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• 2020

This paper aims to highlight the importance of employee participation in green management in hotel firms. In particular, the study examined the role of employee participation in green management on cost saving as a hotel's performance indicator. We collected data from senior and general managers in Korean and US hotels. The results of the study supported our hypotheses, showing that the employee participation had a significantly positive relationship with cost savings in hotels. The results of the study also supported other hypotheses, showing that resource conservation and green building management had positive relationships with cost savings in hotels. Therefore, it can be predicted that green management can save cost in hotel firms. Such managerial implications are discussed.

• Environmental and Resource Economics Review
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• v.12 no.1
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• pp.91-120
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• 2003

This paper is intended to measure sectoral sustainabilities and inter-industry linkage effects of natural capital depletion of the Korean industries, and to analyze sources of their change over time using the familiar input-output model. The sustainability indicator that we are measuring in this paper is based on the so-called genuine saving concept proposed by the World Bank(1997). We accommodated the concept in the extended analytical framework of Proops et al.(1999) to analyze sectoral sustainabilities of the Korean industries. We decomposed sectoral sustainabilities so measured into their composing factors based on the decomposition method devised by Chung & Rhee (2001). According to our analysis, overall sustainability of the Korean industries has been declined since 1995. In heavy and chemical, transportation, and electricity sectors, their sustainabilities has been gotten worse. Among four major factors influencing the sustainability, change in GDP was the most important followed by changes in savings, industrial structures, and demand patterns.

• Environmental and Resource Economics Review
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• v.9 no.4
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• pp.663-700
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• 2000

한강은 서울 지역을 관통하고 있다는 점에서 수도권의 수자원 이용과 폐수 수용체로서의 한강의 역할이 실로 막대하다. 이런 맥락에서 한강에서의 수질오염문제는 주요한 사회경제적 문제 중의 하나로 부각되고 있다. 한강 수질 악화를 방지하기 위한 관리 방안이 이미 시행중에 있으나 여전히 한강 수질 오염은 문제로 남아 있는 실정이다. 이를 감안하여 보다 나은 관리책에 대한 요구에 부응하기 위하여 본 논문은 기존의 수질기준을 최소비용으로 달성하는 비용 효과적인 방식을 시스템 최적화 분석 기법에 접목하는 모델을 구축하고 있다. 이 모델은 우리 나라에 두드러진 수문학적 특징, 즉 자정능력상의 계절적 차이가 지역적 특성과 오염 처리 기술상의 다양함, 그리고 기존의 법적 제도적 특정들과 어떻게 연결되어 얼마나 처리 비용상의 절약을 유도해 낼 수 있는지에 관한 정책정보를 제공해 줄 수 있게 고안되었다. 연구의 결과치에 의하면, 표적 지천상의 지역적 안배와 처리 공정상의 기술-비용적 차이를 고려하고 비갈수기에 처리시설을 신축적으로 운영할 경우 한강 수계에서 BOD 부하량 삭감비용은 상당한 정도( 예로, 1992년 물가수준에서 매일 3,000만 원 이상) 절감 가능한 것으로 나타나고 있다.

• Journal of Communications and Networks
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• v.16 no.4
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• pp.378-384
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• 2014

Replication routing can greatly improve the data delivery performance by enabling multiple replicas of the same packet to be transmitted towards its destination simultaneously. It has been studied extensively recently and is now a widely accepted routing paradigm in delay tolerant networks (DTNs). However, in this field, the issue of how to maximize the utilization efficiency of limited replication quota in a resource-saving manner and therefore making replication routing to be more efficient in networks with limited resources has not received enough attention. In this paper, we propose a DTN routing protocol with back-pressure based replica distribution. Our protocol models the replica distribution problem from a resource allocation perspective and it utilizes the idea of back-pressure algorithm, which can be used for providing efficient network resource allocation for replication quota assignment among encountered nodes. Simulation results demonstrate that the proposed protocol significantly outperforms existing replication routing protocols in terms of packet delay and delivery ratio.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.3
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• pp.814-836
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• 2021

Wildlife ecologists and biologists recapture deer to collect tracking data from deer collars or wait for a drop-off of a deer collar construction that is automatically detached and disconnected. The research teams need to manage a base camp with medical trailers, helicopters, and airplanes to capture deer or wait for several months until the deer collar drops off of the deer's neck. We propose an intelligent robust base-station research with a low-cost and time saving method to obtain recording sensor data from their collars to a listener node, and readings are obtained without opening the weatherproof deer collar. We successfully designed the and implemented a robust base station system for automatically collecting data of the collars and listener motes in harsh wilderness environments. Intelligent solutions were also analyzed for improved data collections and pattern predictions with drone-based detection and tracking algorithms.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.29-34
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• 2008

In this paper, we propose an entropy-based dynamic routing protocol for supporting effective route stability in mobile ad-hoc wireless sensor networks(MAWSN). The basic ideas and features are as follows. First, construction of entropy-based stable routing route using mobility of nodes between a source node and a destination node. Second, usage of location and direction information for route construction to support resource saving. Third, We consider a realistic approach, in the points of view of the MAWSN, based on mobile sensor nodes as well as fixed sensor nodes in sensor fields while the conventional research for sensor networks focus on mainly fixed sensor nodes. The performance evaluation of the proposed routing protocol is performed via simulation using OPNET. The simulation results show the proposed routing protocol can effectively support route stability and packet delivery ratio.

• Environmental and Resource Economics Review
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• v.18 no.1
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• pp.75-103
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• 2009

The hypothesis suggested by Porter and van der Linde claims that innovating firms operate in a dynamic competitive situation which allows global diffusion of environmental-friendly technologies. Therefore, countries that are subjects to more stringent environmental regulations may become net exporters of environmental technologies. In the context of Porter hypothesis, this study investigates the impact of importing countries' environmental regulation on Korea and Japan's export flows of technologies for renewable energies and energy efficiency by estimating the gravity equation. The estimation result shows that : (1) our results are consistent with the Porter hypothesis where environmental regulation represents a significant source of comparative advantages, (2) Korea's export flows of technologies for renewable energies and energy efficiency with respect to the importing countries' environmental regulation are more sensitive than Japan's, and (3) the adverse relationship between export flows and importers' environmental stringency in developing countries does not hold in the renewable energies and energy efficiency related sector.

• Journal of the Korean Geographical Society
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• v.45 no.1
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• pp.1-10
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• 2010

Low-carbon green waterfront cities for overseas cases were reviewed to propose the direction for Korea. The implications suggested include energy saving by resource circulation, compact land use planning, transit oriented development, and utilization of renewable energy. These in turn suggest the following implementations; (1) Energy saving according to compact city, complex land use, and transit oriented development, (2) Renewable energy use in buildings and daily lives, (3) Expansion of green space for carbon mitigation and improved quality of life, and (4) Water and resource circulation system. We finally discussed that development of the green waterfront cities in Korea requires the fundamentals of low-carbon green waterfront cities achieved by overseas cases study and technical investigation.