• 전기전자학회논문지
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• 제24권3호
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• pp.685-690
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• 2020

휴대용 기기나 에지 단말을 위한 CNN인 MobileNet V2를 기반으로 연산량을 크게 줄이면서도 정확도는 증가시킨 효율적인 인공신경망 네트워크 구조를 제안한다. 제안하는 구조는 Bottleneck 층 구조를 유지하면서 확장 계수를 증가시키고 일부 층을 제거하는 등의 변화를 통해 연산량을 절반 이하로 줄였다. 설계한 네트워크는 ImageNet100 데이터셋을 이용하여 분류 정확도와 CPU 및 GPU에서의 연산 시간을 측정하여 그 성능을 검증 하였다. 또한, 현재 딥러닝 가속기로 널리 이용하는 GPU에서 네트워크 구조에 따라 동작 성능이 달라짐도 보였다.

• 한국해양공학회지
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• 제22권3호
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• pp.47-57
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• 2008

Many accidents occur on the oceans. Accidents involving ships can cause enormous damage. When an accident occurs, the cost of environmental restoration can bankrupt even a top-ranked international company. The potential damages resulting from ship accidents have resulted in many international agreements such as MARPOL, SOLAS, ISM Code, etc. The viability of damaged ships has become more and more important. A damaged ship's viability and cargo safety can be improved by a safety assessment design procedure. We consider th￡ shipbuilding industry's distributed characteristics to define a safety assessment system with software engineering-based requirements analysis. We used a distributed network-based simulation method (HLA - High level architecture), because of ease of reuse and expansion of existing components to other situations, and because it is a military standard. HLA is the standard for distributed network-based simulation in many countries including the United States, Canada, Israel, and Korea. The paper describes research to develop a prototype of a network-based safety assessment simulation system by software engineering based analysis.

• 한국정보시스템학회지:정보시스템연구
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• 제24권1호
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• pp.147-168
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• 2015

Why people reduce or stop using social network services(SNS), which are regarded as a mean of relationship and communication, unlike the early trend? To explain the phenomenon, this study tries to predict psychological decision making process of users from perspectives of cognitive dissonance theory. From this perspective, this study attempted an integrative approach that reflected 'User's literacy' indicating the ability of individuals to use SNS, and 'negative mass media influence' such as media reports on side effects or the bad experiences of acquaintances, along with the 3 factors used in the SNS Prior research. This study conducted an empirical analysis by surveying 256 facebook users, and the major findings are as follows:- First, Social-overload, complexity, uncertainty and negative media influence are significantly affect dissonance on the use of SNS. Second, Dissonance on the use of SNS significantly affects the behavior that possibly reduces and limits the use of SNS. In other words, the users who have experienced psychological dissonance respond passively by avoiding the use of SNS to resolve the dissonance. Third, the moderating effect of User's literacy wasn't a significant. This study presents a clue to understand psychological decision making process of use of SNS and a guideline for establishing practical strategies. In addition, it is important to note that this study contributes to expansion of theoretical discussion about usage.

• 한국융합학회논문지
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• 제6권2호
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• pp.31-36
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• 2015

본 논문은 중국 시장 이후에 새로운 시장으로 부각되고 있는 인도차이나반도의 여러 국가 중 특히 라오스를 중심으로 중소기업의 수출정책 활성화 방안으로 연구되어졌다. 라오스는 사회주의 국가이지만 2014년 현재 활발한 개방정책을 필두로 교육, 사회, 문화적인 인적교류가 활발하게 진행되고 있고, 경공업 및 사회간접자본의 확충 등 경제개발을 위한 초석을 다지고 있다. 본 논문은 대기업과 정부의 공적 기관이 발 빠르게 대응하지 못하는 신흥 개척시장에 대한 선점을 위해 현지에서 이미 네트워크를 구축한 현지 개척개발인력, 예를 들면 봉사, 선교, 연구 개발인력들과의 인적네트워크 융합을 통해 성장하는 도시와 지역에서 중소기업의 활성화방안을 찾는다.

• 한국항공운항학회지
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• 제22권4호
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• pp.15-24
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• 2014

Low Cost Carrier(LCC)s in Asia Pacific market are expected to record high growth due to the expansion of Open Sky Policy among Korea, Japan, China and South East Asia. As everybody is aware of, LCC is not only saving flight cost but also creates differentiating business model by reducing unnecessary services such as F&B and in-flight duty free sales services. Booming LCCs in Asian market will cause not only Incheon airport but also other local airports in Korea to compete heavily to attract LCCs. For example, Air Asia Group with more than 200 fleet has expanded its alliance network throughout Asia. Therefore this paper has researched a new business model operating a LCC terminal for the hub airport competitiveness. According to analysis result of case study, it was found out, considering increasing airline demand next decade, Incheon airport and other domestic airports in Korea had better change an existing terminal into a LCC Terminal(LCCT) to differentiate airport services and expand its hub network. That is because of economic feasibility, first of all, of securing hub and spoke networking capabilities with airlines and finally of developing commercial facilities customizing LCC passengers' demand.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권11호
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• pp.1076-1080
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• 2010

EPC(Electronic Product Code) 기반의 물류정보 네트워크인 EPCglobal 네트워크는 다수 기업이 유기적으로 결합하여 이루어지는 개방형으로 발전하고 있다. EPC-global 네트워크에서는 물류정보가 분산되어 있고, 그 양이 방대하기 때문에 효과적으로 정보를 관리하기 위한 노력이 요구된다. EPCglobal에서는 세계적인 연구소 및 업체들이 모여 RFID/EPC 기반 물류 네트워크에서의 EPC Information Service(EPCIS), Object Naming Service(ONS) 등의 구조에 대한 표준을 정의하고 관련 표준에 대한 연구를 계속하고 있다. 본 논문에서는 EPCIS와 EPC Discovery Service(EPCDS)에 대해 표준에서 요구하는 기능과 역할을 충족시키고, 나아가 더욱 효율적인 물류정보 관리를 위해 확장된 기능의 EPCIS와 EPCDS를 제안한다.

• 대한원격탐사학회지
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• 제19권1호
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• pp.81-89
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• 2003

A provision of spatial information is expected to make a market explosion in various fields. A distribution of spatial data on wireless mobile environments indicates a huge expansion of mobile technology as well as a spread of geospatial applications. For high-qualified spatial information, the 4S technology Project that is integrating four kinds of spatial systems is currently being executed with the goal of nationwide integration of spatial data and spatial information systems. In terms of network environments, a mobile ad hoc network where mobile terminals communicate with each other without any infrastructures has been standardized for the next generation mobile wireless network. With respect to the future technologies for spatial information, it is necessary to design 4S applications on mobile ad hoc networks. This paper addresses the issue, which is proposing design concepts for distributing 4S spatial data on mobile ad hoc networks and for ad hoc styled 4S applications.

• KEPCO Journal on Electric Power and Energy
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• 제7권1호
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• pp.93-99
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• 2021

The government has proposed a mission to enhance intelligent power networks, decrease coal-fired generation, expand distributed energy resources, and promote energy prosumer into the distribution network in Korea. Installation cost of facility expansion to guaranteed interconnection with small distributed energy resources increases dramatically on KEPCO's distribution sector. And it is hard to withdraw in time. In addition, there are explicit research is required to meet the reliability on grid corresponding to the increase of distributed power. Infrastructure support for accommodating energy prosumer is also needed. Therefore, KEPCO is pushing transition to DSO by expanding distribution management scope and changing its roles. In addition, KEPCO is proactively preparing for integrated operation between distribution network and existing distributed power which is accommodated passively. KEPCO is also trying to accept multiple network users, e.g. building platforms, to manage a data and promote new markets. In the long term, transition to DSO will achieve saving investment costs for accommodating distributed sources and maintaining stable electrical quality. And it will be possible to create new business model using the platform to secure revenue.

• 방사성폐기물학회지
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• 제20권3호
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• pp.269-278
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• 2022

The buffer is a critical barrier component in an engineered barrier system, and its purpose is to prevent potential radionuclides from leaking out from a damaged canister by filling the void in the repository. No experimental parameters exist that can describe the buffer expansion phenomenon when Kyeongju bentonite, which is a buffer candidate material available in Korea, is exposed to groundwater. As conventional experiments to determine these parameters are time consuming and complicated, simple swelling pressure tests, numerical modeling, and machine learning are used in this study to obtain the parameters required to establish a numerical model that can simulate swelling. Swelling tests conducted using Kyeongju bentonite are emulated using the COMSOL Multiphysics numerical analysis tool. Relationships between the swelling phenomenon and mechanical parameters are determined via an artificial neural network. Subsequently, by inputting the swelling tests results into the network, the values for the mechanical parameters of Kyeongju bentonite are obtained. Sensitivity analysis is performed to identify the influential parameters. Results of the numerical analysis based on the identified mechanical parameters are consistent with the experimental values.

• 천문학회보
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• 제46권2호
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• pp.77.2-77.2
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• 2021

Starting with the observation of sunspots in 1987, Korea Astronomy and Space Science Institute (KASI) has developed and installed various ground-based instruments for space weather research in Korea. Recently, SNIPE and CODEX are also being developed as space-based instruments. Expansion of the observation area and simultaneous observation have become important in the study of space weather. We have started Next-Generation Space Weather Observation Network Project this year. In order to establish a solar observation network, we planned to develop the Next Solar Telescope (NxST) which is a solar imaging spectrograph, and to install three NxST in the northern hemisphere. And we also planned to develop the Thermosphere-Ionosphere-Mesosphere Observation System (TIMOS), Global Navigation Satellite System (GNSS), and Geomagnetic packages, and install them in about ten sites over the world, for the purpose of establishing a global observation network for the near-earth space weather. We can take simultaneously observed space weather data in the global area, and are expecting it will play an important role in the international community for space weather research. We also have a strategy to secure observational technologies necessary for big space missions in the future, through this project.