• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1571-1576
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• 2005

DCS has many processing components and various communication elements. And its communication delay characteristic is affected diverse operating situation and context. Especially, binding signal which traversed from one control-node to another control-node undergo all sort of delay conditions. So its delay value has large deviation with the lapse of time, and the measurement of delay statistics during long time is very difficult by using general oscilloscope or other normal instruments. This thesis introduces the design and implementation of PC-based BDAS(Binding Delay Analysis System) System developed to overcomes these hardships. The system has signal-generator, IO-card, data-acquisition module, delay-calculation and analyzer module, those are implemented on industrial standard PC/Ethernet hardware and Windows/Linux platforms. This system can detect accurate whole-system-wide delay time including io, control processing and network delay, in the resolution of msec unit, and can analyze each channel's delay-historic data which is maintained by realtime database. So, this system has strong points of open system architecture, for example, user-friendly environment, low cost, high compatibility, simplicity of maintenance and high extension ability. Of all things, the measuring capability of long-time delay-statistics obtained through historic-DB make the system more valuable and useful, which function is essential to analyze accurate delay performance of DCS system. Using this system, the verification of delay performance of DCS for nuclear power plants is succeeded in KNICS(Korea Nuclear Instrumentation & Control System) projects

• KIEAE Journal
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• 제16권6호
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• pp.103-108
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• 2016

Purpose: This study has developed economical and environmentally friendly storage type infiltration facilities that securing storage space inside the infiltration facility. It focused on preventing flooding rainfall as well as securing more groundwater through rainwater infiltration that is valuable for the dry season. In addition, this study compares the installation cost of the storage-type infiltration facility to the cost of the conventional rainwater management facilities to demonstrate the economic efficiency of the storage-based infiltration facility. Method: Unit infiltration of this facility is calculated and when it was applied to a certain capacity, the amount of countermeasures are proposed in case study. Result: Unit infiltration of it is $0.2541m^3/hr$ and un it Temporary storage of it is $1.054m^3/m$. As a result, the infiltration effect of this facility is $1.306m^3/hr$. The cost was approximately 30% reduction in time to apply the storage type infiltration facility as compared with the case to apply the existing penetration of the facilities. Since the penetration of the existing facilities is smaller than that and it has much securing volume to process the same the amount of countermeasures. Therefore, it is determined that the cost significantly increases in material cost part. On the other hand, storage type infiltration facility is installed a small quantity because Unit Temporary storage and infiltration are bigger than that. So, it occurred to reduce material and installation costs.

• 한국전자통신학회논문지
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• 제11권10호
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• pp.983-988
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• 2016

사물인터넷이란 사람과 사물, 사물과 사물은 클라우드를 통해 연결 있다. 새로운 ICT기술로 LED조명과의 결합을 통해 획기적 에너지 절감이 가능하고 인간중심, 친환경, 그리고 사용자 요구환경에 부합되는 콘텐츠가 내장된 다기능 솔루션을 사용자 요구사항에 맞추어 실시시간으로 제공하는 산업간, 기술 융합형 시스템화되 차세대 조명이라고 할 수 있다. 본 논문에서는 인간중심으로 스마트 기기와 클라우드를 활용한 LED조명 제어 시스템구축과 관련하여 무선을 통한 아두이노 윤보드 연결에 사용자가 스마트 기기로 클라우드를 통해 LED조명이 켜지거나 혹은 꺼지는지를 관해서 개발 하였다. 아두이노 윤에서는 인터넷에 연결된 후, 현재 날짜와 시간정보를 리눅스 쉘 명령을 통해 취하고 그 값을 브리지(BRIDGE)를 통해 오는 방법을 사용했다.

• 한국터널지하공간학회 논문집
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• 제8권1호
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• pp.31-40
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• 2006

최근 부각되고 있는 환경친화적인 설계의 결과로서 터널 입출구의 구조물이 연약한 지반(붕적층) 에 불가피하게 건설 되곤 한다. 그런 터널 공사의 경우, 주변 지반뿐만 아니라 라이닝 지보재의 충분한 지지력을 확보해야 한다. 이와 관련하여, 높은 강성을 갖는 H형 강지보재가 라이닝을 지지하기 위해 흔히 사용되었다. 그러나 수치해석에 의한 구조적인 안정성을 평가하는데 있어서 그 효과는 무시되는 젓이 관례였다. 본 연구에서는 붕적층에 적용된 터널에 대하여 강지보재로 사용된 H형강을 수치해석 모델에서 강성 적용을 0%, 50%, 75%, 100%로 반영하여 3차원 유한요소해석을 수행하였고, 각 강성 적용율에 따른 숏크리트 용력 감소효과를 비교 검토하였다. 수치해석으로부터 얻어진 데이터는 현장계측결과와 비교하였다, 연구 결과로부터 강지보재의 숏크리트에 대한 효과가 검증되었고 적절한 강성률은 50~75%의 범위 내에서 적절한 것으로 판단되었다.

• 한국컴퓨터정보학회논문지
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• 제16권2호
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• pp.113-120
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• 2011

무선네트워크 및 센서기술의 발달 및 스마트폰과 같은 지능화된 단말기의 보급 확대를 통해 IT융합형 정보의 활용도가 산업 전반으로 크게 확대되고 있다. 특히 기존 전통산업은 이러한 변화에 직접적인 영향을 받고 있으며 승강기 산업 분야 역시 다양한 분야로의 진화와 변화를 추구하고 있다. 빌딩의 초고층화와 사용자 환경의 다변화는 새로운 환경의 접근방식이 요구되며, 이를 통해 승강기가 삶의 새로운 중심 모델로 자리 잡고자 하는 필요성이 대두되고 있다. 이에 본 논문에서는 IT융합형 승강기 모델을 통해 유무선 통합 환경에서 사용자 중심형 서비스 모델을 제시 하고자 한다. 이를 위해 IT환경과 승강기 시스템과의 관계 모델과 유무선 환경에서의 서비스 모델 그리고 스마트폰 기반의 서비스접근 방법들을 제시한다. 이를 통해 승강기의 접근성을 향상 시키고 유무선 환경에서 보다 효율적인 정보 제공과 사용자의 편이성 및 장애인들의 접근성 보장에 도움을 제공할 수 있을 것이다.

• Molecular & Cellular Toxicology
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• 제3권3호
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• pp.208-213
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• 2007

With the help of a development and popularization of microarray technology that enable to us to simultaneously investigate the expression pattern of thousands of genes, the toxicogenomics experimenters can interpret the genome-scale interaction between genes exposed in toxicant or toxicant-related environment. The ultimate and primary goal of toxicogenomics identifies functional context among the group of genes that are differentially or similarly coexpressed under the specific toxic substance. On the other side, public reference databases with transcriptom, proteom, and biological pathway information are needed for the analysis of these complex omics data. However, due to the heterogeneous and independent nature of these databases, it is hard to individually analyze a large omics annotations and their pathway information. Fortunately, several web sites of the public database provide information linked to other. Nevertheless it involves not only approriate information but also unnecessary information to users. Therefore, the systematically integrated database that is suitable to a demand of experimenters is needed. For these reasons, we propose SOP (Search of Omics Pathway) database system which is constructed as the integrated biological database converting heterogeneous feature of public databases into combined feature. In addition, SOP offers user-friendly web interfaces which enable users to submit gene queries for biological interpretation of gene lists derived from omics experiments. Outputs of SOP web interface are supported as the omics annotation table and the visualized pathway maps of KEGG PATHWAY database. We believe that SOP will appear as a helpful tool to perform biological interpretation of genes or proteins traced to omics experiments, lead to new discoveries from their pathway analysis, and design new hypothesis for a next toxicogenomics experiments.

• 한국인터넷방송통신학회논문지
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• 제11권5호
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• pp.19-25
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• 2011

최근 그린 IT 기술이 이슈화 되면서 전 세계적으로 탄소 배출을 낮추고 에너지 효율을 높일 수 있는 환경 친화적인 광원에 대한 연구가 활발히 진행되고 있으며, 특히 고유가와 환경오염 등의 문제로 기존의 백열등이나 형광등을 대체하기 위한 새로운 광원으로 LED가 크게 주목을 받고 있다. 본 논문에서는 저전력, 고효율, 고휘도의 LED 모듈에 온도, 습도, 조도, 그리고 이동 감지 센서를 포함한 복합 센서 모듈을 조합하여 가로등을 지능화하고, ZigBee 모듈을 이용하여 가로등 간에 IT기술인 USN 망 융합을 통하여, 가로등 시스템을 중앙에서 모니터링하고 지역 특성에 따라 선택적으로 가로등의 점멸을 원격으로 제어함으로써 효과적으로 에너지 절약을 극대화할 수 있는 Ad-Hoc망 기반 LED-IT-Sensor 통합 가로등을 설계하고 구현하였다.

• 한국전산유체공학회지
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• 제20권4호
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• pp.81-92
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• 2015

Construction waste mainly consists of concrete aggregates of various size. Improper handling of concrete waste would be a major environmental problem whereas its recycling would be both economically useful and environmentally friendly. Bigger concrete aggregates are crushed and converted to medium and fine particles to make them recyclable. An apparatus to separate the concrete aggregates by their size is thus needed for their effective recycling. In this work, segregation of concrete particles in air flows from a newly designed rotary separator having three stages of blades is simulated using a commercial software, ANSYS-CFX. Both 2-D and 3-D models with 360, 240 and 180 blades in each stage are considered. Fundamental mechanism of separation of particles(pase) and the effect of design parameters such as particle size, rotor speed, air flow rate etc. on the performance of the separator are investigated. Critical size of particles that can be separated by the developed separator is also presented in this work. Simulation results are overall in good agreement with data predicted from the theoretical model previously reported in the companion paper.

• 유통과학연구
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• 제16권2호
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• pp.67-81
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• 2018

Purpose - Recently the importance of green consumption and corporate social responsibility has been increasing, thereby enhancing the importance of green consumption space as well. The retail space, as a representative consumption space, is now consuming more energy by introducing bigger retail space, 24-hour operation, cutting-edge equipment, and manless checkout system. Especially for retailers, who are constantly interacting with consumers, not only the economic consideration but also the consumer experience via retail service and physical retail space is crucial for their success. Therefore, this study intends to understand the main factors of motivating consumer perception about green retail space. In addition, we further investigate the mediating and moderating variables to encourage revisit intention and green retail space image. Research design, data, and methodology - In order to test our hypotheses with two models, we conducted a survey using questionnaires. In model 1, 356 respondents were surveyed to determine whether consumers' green attitudes and behaviors enhance environmentally friendly perception on retail space properties. In model 2, a questionnaire survey was conducted on 69 consumers who have experience in green retail space. Questionnaire surveys were conducted with on-line panels in Korea and analyzed using regression model and Hayes' PROCESS macro. Results - We found that consumers with green attitude put more importance on the attributes of green retail space. Also, the utility of the green retail space was found to be significant in emotional and social benefits. And, the consumers, who perceived the importance of green retail space, show higher revisit intentions. The emotional and social utilities have significant positive effects on revisit intention through green retail space image. Conclusions - This study demonstrates that a green retail space can induce positive consumer utility, thereby increasing green retail space image and revisit intention. Thus, in order to increase the image and revisit, retailers should communicate green messages with consumers, enhance green attributes of retail space, and target green consumers. To do so, we suggest that various marketing efforts such as publicity and education are needed to appeal experiential green products and retail space to consumers.

• Journal of Advanced Marine Engineering and Technology
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• 제39권10호
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• pp.1002-1010
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• 2015

Natural gas hydrates are newly emerging as an environment-friendly source of energy to substitute for fossil fuels in the 21stcentury.NGHs are reported to holds much amounts of natural gas (up to 182 standard volumes of gas per volume of hydrate); they are easy to store and safe to carry at about minus 20 degree Celsius under atmospheric pressure because of the self-preservation phenomenon of gas hydrates. The transporting method by gas-ice-hydrate ship carriers has been introduced and developed by a variety of industry and research institutions. Our team has been conducted to develop NGH total systems, including a breakthrough NGH carrier for sea transportation, since 2011. The NGH pellet carrier does not require a separate cooling system for cargo, and the initial temperature is maintained through insulation of the cargo tanks throughout the transport to the final destination. The heat conducted from the exterior and passing through the insulation material of the hull should be cut off as much as possible, but heat inflow inside the cargo tank from an external source is inevitable during transport. In this study, the heat transfer in a cargo tank of a 115K NGH carrier was analyzed through simulation with a commercial CFD code to estimate the boil-off gas/boil-off rate on the developed carrier and understand major hazards that could significantly impact the safety of the vessel.