• 전자통신동향분석
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• 제35권7호
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• pp.36-45
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• 2020

The method and process of research and development (R&D) is changing when we develop artificial intelligence (AI), and the way R&D results are dispersed is also changing. For the R&D process, using and participating in open-source ecosystems has become more important, so we need to be prepared for open source. For product and service development, a combination of AI algorithm, data, and computing power is needed. In this paper, we introduce ETRI AI Strategy #4, "Expanding AI Open Platform." It consists of two key tasks: one to build an AI open source platform (OSP) to create a cooperative AI R&D ecosystem, and another to systematize the "x+AI" open platform (XOP) to disperse AI technologies into the ecosystem.

• ETRI Journal
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• 제42권2호
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• pp.196-204
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• 2020

Open-source software development projects are well suited for exploring new ideas and acquiring knowledge from developers outside of the project. In this paper, we examine the impact of external developers on innovation in open-source software development from the perspective of organizational learning theory. We examine the roles of external and internal developers, who "explore" and "exploit," respectively, on the innovation performance of 17 691 open-source software development projects whose data is stored in the GitHub platform. The results indicate that a multifaceted strategy, in which the exploitation successfully supports the exploration, is most effective for their success. The results also indicate that the role of exploration decreases after the release of the software.

• 대한원격탐사학회지
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• 제33권4호
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• pp.339-350
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• 2017

In recent, cloud computing paradigm and open source as a huge trend in the Information Communication Technology (ICT) are widely applied, being closely interrelated to each other in the various applications. The integrated services by both technologies is generally regarded as one of a prospective web-based business models impacting the concerned industries. In spite of progressing those technologies, there are a few application cases in the geo-based application domains. The purpose of this study is to develop a cloud-based service system for satellite image processing based on the pure and full open source. On the OpenStack, cloud computing open source, virtual servers for system management by open source stack and image processing functionalities provided by OTB have been built or constructed. In this stage, practical image processing functions for KOMPSAT within this service system are thresholding segmentation, pan-sharpening with multi-resolution image sets, change detection with paired image sets. This is the first case in which a government-supporting space science institution provides cloud-based services for satellite image processing functionalities based on pure open source stack. It is expected that this implemented system can expand with further image processing algorithms using public and open data sets.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2011년 춘계학술대회논문집
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• pp.327-330
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• 2011

CFD simulation is widely used in various industries, universities and research centers. In Korea most of the researchers use foreign commercial S/W packages especially in industries. But commercial CFD packages have some problems as limit to source code and very high license foe. So from several years ago open source CFD code has been widely spread as an alternative. But in Korea there are a few users of open source code. Insufficiency of performance validation as for accuracy, robustness, convenience and parallel speed-up is important obstacles of open source code. So we tested some validation cases as to incompressible external aerodynamics and internal flaws and now are doing compressible flaws. As the first stage of compressible flow validation, we simulated Korea next generation high speed train(HEMU). It's running condition is 400km/hr and maximum Mach number reaches up to 0.4. With the high speed train we tested accuracy, robustness and parallel performance of open source CFD code OpenFOAM Because there isn't experimental data we compared results with widely used commercial code. When use $1^{st}$ order upwind scheme aerodynamic forces are very similar to commercial code. But using $2^{nd}$ order upwind scheme there was some discrepancy. The reason of the difference is not clear yet. Mesh manipulation, domain decomposition, post-processing and robustness are satisfactory. Paralle lperformance is similar to commercial code.

• 핵의학기술
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• 제13권1호
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• pp.51-56
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• 2009

목적 : Small-scalled PACS, Pc-based PACS로 표현되는 MicroPACS 시스템 구축에 대한 관심도가 급격하게 증가하고 있는 추세이다. MicroPACS 시스템은 PACS를 작은 규모에서 사용할 수 있도록 구성해놓은 것이고, 이 시스템을 구성하기 위해서는 DICOM viewer나 연결프로그램 등이 필요하다. 이것은 공개소스프로그램(Open Source Program)을 통해서 어느 누구나 쉽게 무료로 다운로드를 받을 수 있게 되어있다. 본 논문은 Open source program으로 MicroPACS를 직접 구성해보았고, 저장매체로서의 활용가치를 측정하기위하여 성능, 안정성 측면에서 기존의 광 저장매체(CD, DVDRAM)와 비교 분석하였다. 실험재료 및 방법 : 1. 소형 PACS를 구축하기 위해서 먼저 다음 기준에 맞는 DICOM Server Software를 검색한다. (1) 윈도우체제에서 사용가능할 것. (2) Free ware일 것. (3) PET/CT scanner와 호환되어야 할 것. (4) 사용하기 쉬워야 할 것. (5) 저장의 한계가 없어야 할 것. 2. (1) MicroPACS의 성능을 평가하기 위해 환자 1명의 Data ($^{18}F$-FDG Torso PET/CT)를 현재 Back-up장치로 쓰이는 광 저장매체(CD, DVD-RAM)와 MicroPACS에 저장하는데 소요되는 시간(Back up time)과 workstation으로 복구되기까지의 시간(Retrieval time)을 비교해 보았다. (2) PET/CT 검사를 시행했던 환자 1명의 병록번호와 검사 시행날짜를 핵의학과 직원 7명을 대상으로 알려주고 Data를 찾는데 소요되는 시간을 MicroPACS와 광 저장매체(CD, DVD-RAM)에서 각각 측정하여 비교하였다. 3. 기존의 백업장치로 쓰였던 CD들 중에서 2004년부터 2006년까지 500장을 무작위로 뽑아서 loading을 하였고 그중에서 얼마만큼의 에러가 발생하였는지를 측정하여 MicroPACS의 안정성을 비교평가하였다. 결과 : 1. Server와 DICOM viewer 기능을 갖춘 11개의 open source software 중에서 Conquest DICOM Server를 선택하였다. 2. (1) Backup과 Retrieval 시간 비교(단위 : 분)는 다음과 같다; DVD-RAM(5.13,2.26)/Conquest DICOM Server (1.49,1.19) by GE DSTE (p<0.001), CD (6.12,3.61)/Conquest (0.82,2.23) by GE DLS (p<0.001), CD (5.88,3.25)/Conquest (1.05,2.06) by SIEMENS. (2) CD ($156{\pm}46$초), DVD-RAM ($115{\pm}21$초) and Conquest DICOM Server ($13{\pm}6$초). 3. 1년간 MicroPACS에서의 데이터손실은 없었으며(0%), 500장의 CD 중에서 14개(2.8%)가 Loading하는데 실패하였다. 결론 : 현재 많은 병원에서 도입되고 있는 Full PACS를 open source software를 통하여 소규모의 PACS로 재현해 보았고, 그 결과 가능하다는 결론이 나왔다. 데이터 저장의 유용성을 평가한 결과에서 MicroPACS를 이용하는 것이 기존의 광저장매체를 사용하는 것보다 효율적이고 작업속도가 향상 된다는 것을 확인할 수 있다.

• 지식경영연구
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• 제18권4호
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• pp.287-306
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• 2017

This research focus on the effect of developers' participation structure in knowledge creation and knowledge sharing activities in open source software development projects. Based on preferential selection theory, hypotheses of relationship between a developers' concentration of knowledge creation/sharing activities and collaboration performance was derived. To verify the hypotheses, we use the Gini coefficient in the commit contribution of the developers (knowledge creation) and the centralization index in the repository issue network (knowledge sharing network). Using social network analysis, this paper calculates centralization index from developers in the issue boards in each repository based on data from 837 repositories in GitHub, a leading open source software development platform. As a result, instead of all developers creating and sharing knowledge equally, only a few of developers creating and sharing knowledge intensively further improve the performance of the open collaboration. In other words, a few developers predominantly providing commit and actively responding to issues raised from other developers enhance the project performance. The results of this study are expected to be used by developers who manage open source software project as a governance strategy, which could improve the performance of open collaboration.

• 지식경영연구
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• 제19권2호
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• pp.133-150
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• 2018

To cope with the rapid changes in the corporate environment, the creation of innovative output through various forms of collaboration have been discussed. For open collaborations, contributors who distribute to various countries and cultures are able to share knowledge via the internet without physical rewards or responsibilities. In this study, we focused on the open source software project, which is a representative open collaboration. We investigated the factors that affect the knowledge contribution of developers of various countries within the open collaboration platform. Specifically, we investigated the open collaborative nature of multi-culture developers by dividing cultures according to collectivism and individualism. We collected data on 26,604 developers using a python based web crawler for GitHub which is an open source software development platform, and conducted cross-cultural study. This paper contributes to the field of knowledge management by suggesting various impacts of antecedents such as hireability, and information exposure on knowledge sharing according to culture.

• 천문학회보
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• 제41권2호
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• pp.53.2-53.2
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• 2016

We present our experiences with open-source spatio-temporal database systems for managing and analyzing big astronomical data acquired by wide-field time-domain sky surveys. Considering performance, cost, difficulty, and scalability of the database systems, we conduct comparison studies of open-source spatio-temporal databases such as GeoMesa and PostGIS that are already being used for handling big geographical data. Our experiments include ingesting, indexing, and querying millions or billions of astronomical spatio-temporal data. We choose the public VVV (VISTA Variables in the Via Lactea) catalogs of billions measurements for hundreds of millions objects as the test data. We discuss issues of how these spatio-temporal database systems can be adopted in the astronomy community.

• Nuclear Engineering and Technology
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• 제54권3호
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• pp.811-816
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• 2022

This work presents the methodology used to expand the capabilities of the Monte Carlo code OpenMC for the calculation of reactor kinetic parameters: effective delayed neutron fraction β_eff and neutron generation time L. The modified code, OpenMC(Time-Dependent) or OpenMC(TD), was then used to calculate the effective delayed neutron fraction by using the prompt method, while the neutron generation time was estimated using the pulsed method, fitting Λ to the decay of the neutron population. OpenMC(TD) is intended to serve as an alternative for the estimation of kinetic parameters when licensed codes are not available. The results obtained are compared to experimental data and MCNP calculated values for 18 benchmark configurations.

• 대한원격탐사학회지
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• 제25권4호
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• pp.367-374
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• 2009

지오포털이나 공간정보기반구축 등이 최근 공간정보 분야에서 주요한 연구 동향으로 부각되고 있다. 이러한 응용 분야는 Web 2.0과 관련된 다양한 웹 컴퓨팅 기법이나 방법론, 포털에서 제공하는 공개 API, 공개 소스 GIS, 국제 GIS 표준사양 등 부분적으로 발전되어 오고 있는 요소 기술들이 복합적으로 연동되는 성과로 구현이 가능하다. 본 연구에서는 구글 맵 API와 공개 소스 미들웨어인 Deegree를 연동하는 시험 연구를 수행하여 지오포털 구축에서의 공개 소스 적용 가능성을 검토해 보고자 한다. 공개 소스 미들웨어에서는 OGC 등의 국제 표준사양을 지원하므로 다양한 웹 출력 및 외부 데이터베이스 서버간의 자료 호환 및 상호운영이 가능하고 특정한 웹 서비스 구축 목적에 맞는 추가적인 기능의 구현이나 계층적 아키텍처 구현이 가능하게 한다.