• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.6
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• pp.141-154
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• 2009

Digital Ecosystem is a new word for dynamic IT business environments. Digital Ecosystem can consist of various enterprise federations such as competing, collaborating and stable or unstable ones. They make it difficult to implement identity management for the environment. Existing solutions are either too restricting and inflexible to support the dynamic nature of ecosystems since they are too complex and difficult to adopt. This paper is to propose an distributed identity management model for automated processing of identity information between ecosystems. It is featured with being practical, clear and easy to deploy. And it is based on the new OASIS SAML3.0 standard to provide interoperability between existing identity technologies. This paper presents the basic and extended identity model for single service and multiple services. The model presented in this paper can be applied to enterprise context easily.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.270-270
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• 2023

습지 생태계는 복잡한 물리적 생지화학적 프로세스의 상호작용이 있으나, 습지 생태계의 건강성 회복을 위한 첫 번째 단계는 습지 생태계에서의 물순환에 대한 정확한 이해일 것이다. 또한 지역적인 물 균형 및 생태계 보전에서 습지를 활용하기 위해서도 습지 물순환에 대한 정량적인 이해는 필수적이다. 그러나, 습지 물순환의 이해를 위해 필수적인 관측 자료들은 현장 측정으로 획득하기 어려운 자료이거나 비용적인 문제로 인하여 관측이 어려운 실정이다. 이에 본 연구에서는 Sentinel-2 위성 자료를 활용하여 습지의 유입량을 추정하기 위한 절차를 제시하고자 한다. 이를 위해 한반도 동남부의 낙동강에 위치한 주요 다목적댐의 자료를 활용한 분류 기반의 인공지능 모델이 설계된다. 인공지능의 학습을 위한 입력자료는 아래와 같은 절차에 의해 만들어진다. 1) 다목적댐의 수위-물 체적 관계를 이용하여 수위-수표면적 관계 곡선 도출. 2) 수위-수표면적 관계 곡선과 DEM을 활용하여 물과 육지 영역을 구분하는 식별자를 도출. 3) Sentinel-2 위성 정보와 물-육지 식별자를 비교하는 랜덤 포레스트 모델을 설계. 4) 위성 정보의 물-육지 정보로부터 미계측 습지 지역의 물과 육지를 식별할 수 있는 식별자 도출. 이러한 과정을 경유하여 추정된 습지의 수표면적과 습지 지역의 DEM을 결합함으로써 습지의 수위-수표면적-물 체적 관계 곡선이 산정되어, 최종적으로 습지의 유입량이 모의된다. 모의된 습지 유입량은 다양한 수문 모델의 매개변수를 추정하는데 활용될 수 있을 것이며, 검증된 수문 모델을 활용하여 습지의 물순환의 이해도를 증진시킬 수 있을 것으로 기대된다.

• The Journal of Society for e-Business Studies
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• v.20 no.4
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• pp.193-208
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• 2015

In knowledge based society, information technology (IT) has been playing a key role in economic growth. In recent years, it is surprisingly notable that the source of value creation moved from hardware to software in IT industry. Especially, among many kinds of software products, the economic potential of open source was realized by many government agencies. Open source means software codes made by voluntary and open participation of worldwide IT developers, and many policies to promote open source activities were implemented for the purpose of fast growth in IT industry. But in many cases, especially in Korea, the policies promoting open source industry and its ecosystem were not considered successful. Therefore, this study provides the practical reasons for the low performance of Korean open source industry and suggests the pragmatic requisites for effective open source policy. For this purpose, this study applies soft system model (SSM) which is frequently used in academy and industry as a methodology for problem-solving and we link the problems with corresponding policy solutions based on SSM. Given concerns which Korean open source faces now, this study suggests needs for the three different kinds of government policies promoting multiple dimensions of industry: research and development (R&D)-side, supply-side, and computing environment-side. The implications suggested by this research will contribute to implement the practical policy solutions to boost open source industry in Korea.

• Information and Communications Magazine
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• v.28 no.12
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• pp.16-23
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• 2011

최근 스마트폰 확산과 함께 모바일 시장이 개방적인 PC진영으로 편입되면서 ICT 산업구조가 복잡한 개방적 생태계로 재편성되고 있다. 이에 본고에서는 가치 네트워크(Value Network) 관점에서 타 산업 사업자간 상생적 협력관계 구축을 통한 수익배분 모델 등 주요 글로벌 ICT 리더들의 사업전략을 분석하고, 단말 및 서비스 플랫폼을 중심으로 하는 새로운 ICT 생태계의 진화방향을 전망하고자 한다. 특히 앱스 토어를 기반으로 하여 단말 플랫폼을 확장하는 애플의 전략 과 웹을 기반으로 하는 서비스 플랫폼을 통해 이용자의 접점을 확장하는 구글의 사업전략을 비교 분석하여 향후 글로벌 ICT 산업의 전망과 시사점을 제시하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.73-75
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• 2003

게임 세계에 존재하는 수많은 보이드들의 지능적인 집단 행동을 모델링하기 위한 방법으로 플로킹 기법이 많이 사용되고 있다. 특히 생태계에 존재하는 객체들의 행동을 재현하기 위한 연구가 활발하게 진행되고 있는 실정이다. 따라서 본 연구에서는 생태계에서 흔히 볼 수 있는 먹고 먹히는 관계를 퍼지 논리를 통해 게임의 보이드 행동을 모델링하고 구현한다.

• 한국벤처창업학회:학술대회논문집
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• 2019.11a
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• pp.51-59
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• 2019

현대사회가 당면한 다양한 문제를 해결하는 주체로 '제4섹터(the fourth sector)'가 주목받고 있다. 제4섹터는 사회적경제 기업으로 대표되는 제3섹터의 지나친 정부 의존도와 서비스 모델 동형화의 문제점을 해결하고자 등장하였다(Meadows, 1972; Howaldt and Schwarz, 2010). 이러한 제4섹터의 핵심 주체로서 소셜벤처가 언급되고 있다(경기연구원, 2018). 그러나 아직까지 소셜벤처에 대한 학술적 및 정책적 개념이 모호한 실정이다. 따라서 본 연구에서는 사회의 포용적 성장을 도모하기 위해 제4섹터로서의 소셜벤처 정의와 특성을 명확히 하고, 소셜벤처 생태계 활성화를 위한 발전전략을 연구하고자 한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.2
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• pp.195-200
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• 2004

Computer games use an intelligent method called flocking for boids' group behavioral modeling. Flocking can naturally model group behavioral patterns of unpredictable forms such as birds and fishes using some computer resource. In this paper, we implemented an ecosystem which is composed of predator and prey for group behavioral modeling of real underwater ecosystem. Also fuzzy logic is applied to implement instinct desire of ecosystem elements. As the result, we confirmed that the model can overcome breakdown of ecosystem and model naturally ecosystem behavior.

• Journal of Wetlands Research
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• v.19 no.1
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• pp.144-154
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• 2017

The riparian vegetation is one of corridor type ecosystems, an ecotone and able to improve the ecological soundness by structural and functional link. And they act as habitats, sources and sinks of species, conduits, filters and barriers. This study was carried out to develop the vegetation model for the fluctuation areas of lake reservoirs consider of hydrologic and soil environments according to the vegetation structure of the reference ecosystem. To develop the case study, 2 sites within 10degree slope of the Daecheong Lake were selected. The riparian vegetation models were built by the results of GIS analysis, remote satellite analysis, field survey results, consider of water level, flooded frequency, soil and topographic index, land cover or land use etc. 1) study area varied from FWL to -5m of NFWL, 2) slope 10% below, 3) vegetations flooded below 100days yearly are Salix koreensis, Salix chaenomeloides, Salix gracilistyla, 4)land cover type classified wildlife grassland, abandoned paddy field, cropland according to landuse (or landcover), 5)finally model was constructed as ecological landscape forest. The model designs were suggested by 2 types in Daecheong lake reservoir. The model for the riparian vegetation corridors could be the basic and useful data to improve the ecological and landscape properties.

• Journal of the Korea Society for Simulation
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• v.22 no.3
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• pp.1-6
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• 2013

The ecosystem is the complex system consisting of various biotic and abiotic factors and the factors interact with each other in the hierarchical predator-prey relationship. Since the competitive relation spatiotemporally occurs, the initial state of population density and species distribution are likely to play an important role in the stability of the ecosystem. In the present study, we constructed a lattice model to simulate the three-trophic ecosystem (predatorprey- plant) and using the model, explored how the ecosystem stability is affected by the initial density. The size of lattice space was $L{\times}L$, (L=100) with periodic boundary condition. The initial density of the plant was arbitrarily set as the value of 0.2. The simulation result showed that predator and prey coexist when the density of predator is less than or equal to 0.4 and the density of prey is less than or equal to 0.5. On the other hand, when the predator density is more than or equal to 0.5 and the density of prey is more than or equal to 0.6, both of predator and prey were extinct. In addition, we found that the strong nonlinearity in the interaction between species was observed in the border area between the coexistence and extinction in the species density space.

• The Journal of the Korea Contents Association
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• v.10 no.4
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• pp.327-339
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• 2010

The cultural contents are a field that originally has a cycle ranged from producers of various contents and distribution consumption. The various object elements composing of an ecosystem of cultural contents in this cycle, and the search of harmonious relations between these objects is becoming an important issue. The ecological approach on the cultural contents field is not being tried authentically until now, in spite of the expansion of interest and usefulness from its application at present, so there is no detailed discussion on the inside of an ecosystem and its action such as confirmation of object elements composing of the ecosystem, interaction principles between objects and object development, principles of co-evolution, etc. achieving common development of all objects composing of the ecosystem. Therefore, the present research aims to confirm object elements composing of the ecosystem of cultural contents through an ecosystem model that has been researched in several fields of the ecosystem and social science, and to seek interaction between objects and each object as well as a development direction of a total ecosystem.