• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제6권12호
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• pp.549-564
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• 2017

자율성을 가지는 소프트웨어와 사물 인터넷 기술 등의 발달로 단일 시스템이 제공하는 서비스들이 다양해짐은 물론, 기존에는 상상하지 못했던 새로운 서비스들이 시스템간의 협업을 통해 제공되고 있다. 자율성을 가지는 시스템 간의 협업은 마치 생물학적 관점에서의 생태계 구성과 닮아 있다는 점에서 IT 생태계의 개념이 근래 들어 새롭게 대두되었다. IT 생태계란 단일 시스템이 아닌 다수개의 이기종 시스템들이 하나의 공통된 목적을 달성하기 위해 각자의 자율성을 활용하여 자신의 미션을 달성하는 동시에 전체 시스템 그룹의 목적을 이뤄나가는 개념이다. 우리는 앞선 연구에서 IT생태계 구현을 위한 기본적인 몇 가지 메타모델과 초보적인 수준의 아키텍처를 제안한 바 있다. 본 논문은 이러한 선행연구를 정제하여 IT생태계 시스템 구현을 위한 참조 아키텍처 프레임워크를 제안하고 있다. 제안된 프레임워크는 시스템 구성원의 동적 재구성 문제에 비용-혜택 모델을 기반으로 하는 유틸리티 함수와 IT생태계 구성원의 개체 숫자 확장에 따라 기하급수적으로 증가하는 동적 재구성 오버헤드를 감소시킬 수 있는 해결책으로서의 유전자 알고리즘 활용 방안을 포함하고 있다. 무인삼림관리를 위한 IT 생태계 시스템이라는 개연성 있는 사례 연구를 통해 제안된 프레임워크의 효용성을 정량적으로 검증하고 있다.

• Journal of Information Technology Applications and Management
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• 제21권4_spc호
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• pp.431-447
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• 2014

Demand of spectrum resource is tremendously increasing and this trend will continue as more IT services such as cloud computing, smart devices, Internet of Things are provided through wireless network. Recent development of spectrum sharing technology has drawn attention to spectrum policy makers as a promising way to overcome the expected spectrum shortage problem. However, technology-based solution to spectrum shortage problem may not be sustainable since the solution affect only one aspect of spectrum sharing ecosystem. To understand the whole picture of spectrum shortage problem, policies to vitalize spectrum sharing ecosystem were proposed based on the analysis of System Dynamics causal map in the previous study. This study compares and analyzes the effect of those proposed vitalization policies by using System Dynamics simulation. Among seven alternative policies, combined application of demand acceleration policy and technology development policy was found to be more effective for better utilization of spectrum. The effect of demand acceleration policy was offset when other policies are applied together except supply acceleration policy which shows better spectrum sharing.

• 한국환경복원기술학회지
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• 제17권4호
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• pp.69-79
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• 2014

Coastal wetlands are among the most productive biomes in the Earth. The economic values include the direct use of a coastal wetland's ecosystem services, such as food, raw materials, recreation, and tourism. Other values comprise the indirect use of a coastal wetland's ecosystem services, such as carbon sequestration, waste-water treatment, and erosion prevention. In particular, Suncheon Bay is recently attracting attention as the most successful case of the preservation and restoration. This study applies Travel Cost Method (TCM) to estimate the economic value by drawing the demand curve for trips to Suncheon Bay. The TCM is an approach used for economic valuation of non-market goods and services. Based on the results of TCM, this study shows that the economic benefit from recreational uses of the site adds up to \174.7 billion per year. It is also significant in the sense that monetary information is suggested to help local policy makers evaluate the realistic values of coastal wetlands.

• 대한산업공학회지
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• 제39권1호
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• pp.61-72
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• 2013

This research aims to identify promising IT items from the perspectives of Korean SMEs and further to development a policy for SMEs in the IT industry. For this purpose, we adopted a bottom-up approach by discovering IT items on high demand by SMEs as their now growth engines and thus used a survey method. We also analyzed the ecosystem characteristics for the items to help policy-makers establish customized strategy to support their growth. We believe that this research is timely when the concept of ecosystem has emerged and the role of SMEs is emphasized in the IT industry. And the research results are expected to produce valuable information to make a policy for promoting IT items for SMEs and ultimately leading to balanced growth of large firms and SMEs.

• 한국전자파학회논문지
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• 제27권7호
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• pp.588-598
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• 2016

본 논문에서는 전파 산업의 생태계 분석을 통해 산업발전을 위한 정책방향을 도출하고자 하였다. 이를 위해 전파 기술과 서비스의 발전에 따라 변화하는 전파 산업의 성장구조와 메커니즘을 제시하였다. 이 결과를 한국의 전파 산업의 생태계를 분석에 적용하여 계층적 구조에 의한 전파 산업 생태계 분석을 위한 평가지표를 제시하고, 산업 활성화에 영향을 미치는 정책요소를 도출하였다. 이들 결과로부터 전문가 인터뷰 조사를 실시하고, 미래 전파 산업 활성화를 위하여 필요한 5가지 요소의 활성화 정책 방안을 제안하였다.

• 대한산업공학회지
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• 제42권2호
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• pp.138-150
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• 2016

This study aims to analyze the structure and characteristics of the domestic online game industry using network analysis. In particular, two-mode network analysis is employed to measure the network structure, centrality, and cluster for two types of online game platforms, online games and mobile games, from 1996 to 2014. We also conduct a dynamic analysis to capture the structural changes in the ecosystem by internal and external environmental changes before and after turning point for each online game platform. It is revealed that the online game econsystem has the higher number of clusters and higher concentration ratio than those of mobile game ecosystem. In dynamic analysis, both platforms exhibit similar trends over time with the increasing number of clusters, enlargement of largest cluster's size, and decreasing concentration ratio. This study is expected to provide fruitful implications for strategic decision making of online game companies and policy making for the online game industry.

• 환경영향평가
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• 제21권1호
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• pp.209-218
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• 2012

In this study, suitable types and measures of Wildlife Crossing Structures (WCS) for mammals of Korea were analyzed to suggest basic information for design guidelines of WCS. In order to find the types and measures, we conducted field surveys on 79 WCS and literature reviews on 159 WCS. The results of our study were as follows; Small-medium sized carnivores usually use all measures of wildlife underpass, meanwhile large sized herbivores as water deer need lager measures than 0.7 Openness Index(OI). Furthermore, we found that wildlife overpasses were usually used at the measure of 6.8 m width by every mammal. Therefore, we concluded that the proper measures should be lager than 0.7 OI for underpass and 7 m width for overpass.

• 수산해양기술연구
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• 제60권1호
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• pp.37-46
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• 2024

This study was conducted to provide the basic information on environment effects on appearance of ichthyoplankton in the Yeongsan River Estuary in Spring and Summer from 2018 to 2020. Data were obtain from the database of 'Coastal Ecosystem' in "National Survey of Marine Ecosystem." Among the abundance ichthyoplankton species, the Gobiidae spp. dominated, accounting for 85% of the total abundances with the secondary dominant species being the Parablennius yatabei, representing 3% of the abundances. Cluster analysis results revealed a composition differentiated between spring and summer. The Yeongsan River Estuary is known to be significantly influenced by the opening and closing of estuarine gates. In this study, the fluctuation in the number of occurrence groups and abundance among the years and season is attributed to the phenomenon of high water temperature period and the freshwater discharge.

• 한국환경복원기술학회지
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• 제15권5호
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• pp.19-29
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• 2012

The purpose of this study is to suggest improvements of Eco-Natural map preparation guideline by presenting assessment methods that can be applied to the result of river ecosystem health survey and assessment, using the Geographic Information System. The area for studying is the main stream of the Hwang River where is easy to collect data and available to compare before and after of river assessment. It was reevaluated by reflecting the result of river ecosystem health assessment of the Ministry of Environment. As the result, Eco-Natural map of the study area reflecting the river assessment, the changes in the area ratio by grade have been increased from 1.14% to 14.03% in the first-grade and from 24.64% to 43.91% in the second-grade. It is considered to present more realistic grade due to the assessment of the rivers that have not been reflected in the meantime. Consequently, the result of this study will be useful for establishing the development projects on the rivers, providing the foundation for more realistic and active protection.

• 한국IT서비스학회지
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• 제14권1호
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• pp.159-173
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• 2015

This paper presents a study on the Internet of Things based low-power wireless sensor networks for remote monitoring of wildlife ecosystem due to climate change. Especially, it is targeting the wild vegetation communities ecological monitoring. First, we performed a pre-test and analysis for selecting the appropriate frequency for the sensor network to collect and deliver information reliably in harsh propagation environment of the forest area, and selected for sensors for monitoring wild vegetation communities on the basis of considerations for selecting the best sensor. In addition, we have presented the platform concept and hierarchical function structures for effectively monitoring, analyzing and predicting of ecosystem changes, to apply the Internet of Things in the ecological monitoring area. Based on this, this paper presents the system architecture and design of the Internet of Things based low-power wireless sensor networks for monitoring the ecosystem of the wild vegetation communities. Finally, we constructed and operated the test-bed applied to real wild trees, using the developed prototype based on the design.