• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.6
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• pp.420-433
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• 2023

With the development of ICT technologies, various systems and services based on data have been introduced. Also, raising the importance of technologies that provide trust to a data, infrastructure, and services. for ICT services. However, in the existing ICT service environment, there is no way to objectively judge and manage the trust of various components (content, infrastructure, process, service provider, etc) that constitute a specific service, and there is a limitation that we can only rely on the service provider's own quality standards. This paper provides requirements, functional archtecture, and procedures for providing reliable ICT services from the perspective of ITU-T international standards. Trust-enabled service provisioning adds additional functions for providing trust to existing ICT service entities (service resources, stakeholders, and users), collecting, analyzing, and providing trust related information. Therefore, a users can consider the trust of various service components based on analyzed trust information based on their trust requirements.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.31 no.5
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• pp.42-47
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• 2002

건물의 고도화 및 최첨단 공조시스템에 있어서 공기 조화기는 가장 핵심적인 장비로서 고장의 전도는 비교적 단순하나 요소기술의 적용, 운전, 유지관리에서 소홀하게 되 면 환경 업무의 저하와 생산성이 낮아지고 막대한 비용을 초래하기도 한다 . 고장은 설비시스템과 공조기의 사용기간이 길어짐에 따라 마모, 피로 등의 물리적 성능열화가 진행되며 이러한 물리적 열화가 최종적으로 나타나는 현상이 고장이다. 고장의 시간적 변화에는 초기고장, 우발고장, 마모고장으로 분류되며 초기고장은 시스템의 불안정에 따른 원인으로 시운전시에 자주 발생하고 정상적인 운전시에 발생되는 우발고장이 기간이 지나면 마모 고장기에 도달하게되며 이때는 부품의 한계수명과 마모등의 원인으로 고장률이 급격히 증가된다 따라서 본문에서는 공조시스템의 공기조차기의 팬과 펌프 기기의 고장원인을 살펴보고 이에 대한 고장을 신속하게 감시할 수 있는 방안을 일반적일 고찰을 통해 체계적이고 종합적인 대응방안을 소개하여 불필요한 보수비용의 발생과 생산성 저하를 방지하고 내구년수를 증가할 수 있는 신기술의 일부분을 소개하고자 한다.

• Tunnel and Underground Space
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• v.32 no.6
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• pp.568-585
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• 2022

In the present study, we proposed a numerical method for simulating thermally induced fracture slip using a grain-based distinct element model (GBDEM). As a part of DECOVALEX-2023, the thermo-mechanical loading test on a saw-cut rock fracture conducted at the Korea Institute of Civil Engineering and Building Technology was simulated. In the numerical model, the rock sample including a saw-cut fracture was represented as a group of random Voronoi polyhedra. Then, the coupled thermo-mechanical behavior of grains and their interfaces was calculated using 3DEC. The key concerns focused on the temperature evolution, thermally induced principal stress increment, and fracture normal and shear displacements under thermo-mechanical loading. The comparisons between laboratory experimental results and the numerical results revealed that the numerical model reasonably captured the heat transfer and heat loss characteristics of the rock specimen, the horizontal stress increment due to constrained displacement, and the progressive shear failure of the fracture. However, the onset of the fracture slip and the magnitudes of stress increment and fracture displacement showed discrepancies between the numerical and experimental results. We expect the numerical model to be enhanced by continuing collaboration and interaction with other research teams of DECOVALEX-2023 Task G and validated in further study.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.5
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• pp.182-199
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• 2023

Since 2021, government departments have been promoting Automated Driving Technology Development and Innovation Project as national research and development(R&D) project. The automated vehicles and service technologies developed as part of these projects are planned to be subsequently provided to the public at the selected Living Lab City. Therefore, it is important to determine a spatial area and operation section that enables safe and stable automated driving, depending on the purpose and characteristics of the target service. In this study, the static Operational Design Domain(ODD) elements for Level 4 automated driving services were reclassified by reviewing previously published papers and related literature surveys and investigating field data. Spatial analysis techniques were used to consider the reclassified ODD elements for level 4 in the real area of level 3 automated driving services because it is important to reflect the spatial factors affecting safety related to real automated driving technologies and services. Consequently, a total of six driving mode changes(disengagement) were derived through spatial information analysis techniques, and the factors affecting the safety of automated driving were crosswalk, traffic light, intersection, bicycle road, pocket lane, caution sign, and median strip. This spatial factor analysis method is expected to be useful for determining special areas for the automated driving service.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.11
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• pp.62-71
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• 2017

This study classified cities across South Korea according to their urban characteristics, selecting representative cities for respective types, and drawing a relationship among urban characteristic elements, carbon emissions, and the energy consumption of cities. For the classification of cities, the elements of the urban characteristics were examined through a review of the related literature. Factor analysis was then carried out to select the variables from among these elements. The absolute coefficient value found in the analysis was set as a standard. A classification of cities across the country was performed using these variables, and representative cities were chosen for a comparison of the characteristics of each type. For an analysis of the relationships among the urban characteristics according to the type of city, the greenhouse gases, and the energy consumption of cities, emissions of greenhouse gases, electricity consumption, and oil consumption of the representative cities were compared and analyzed by correlation analysis. The analysis results indicated that the cause of greenhouse gas emissions and electricity consumption varies according to the elements of the characteristics of the representative cities, even when they show similar emissions and consumption.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.10
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• pp.1885-1890
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• 2006

Because of the rapid development of information technology and easiness in using internet, Web becomes indispensible utility in every day life and various information has been shared in internet. However, caused by the flood of information in the Web, the skill of acquiring required information with easy becomes one of the most urgent on utilizing internet. As a solution fur the requirement, Semantic Web, which upgrades present web technology by using semantic skills, has been researched actively ud Ontology is regarded as the basis of constructing semantic web system. The aim of this research is on developing agent using ontology skills for botanic resources. Moreover, the system can be used for developing and accumulating various resources effectively.

• Korean Chemical Engineering Research
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• v.44 no.3
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• pp.235-242
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• 2006

Spray pyrosysis is a process to prepare particles and films by evaporating and decomposing droplets of precursor solutions in the order of 1-10 micrometer in diameter. Key elements of the spray pyrolysis process include precursor, solvent, droplet generator, and reactor. Various combination of these 4 elements produces wide range of particles and films. In general. the current status of the spray pyrolysis technology is not quite promising for commercial success. However, this process will be feasible to produce multicomponent functional materials of controlled morphology. In this paper, current status of the spray pyrolysis technology is introduced with the emphasis of production of fluorescence particles.

• Journal of Korean Library and Information Science Society
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• v.44 no.3
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• pp.359-378
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• 2013

This study arranged the function and role of colophon and looked around the history, relevant laws, and description elements of books issued in China. According to the colophon of books issued from China, all colophon have copyrights and description elements in common. Colophon is that we recorded the bibliographic area of the proper book in special place, namely the inside of the cover. Besides, the colophon additionally includes necessary bibliographic areas depending on the development of publishing technology and transition of publishing environment. This colophon is offered as useful sources of information when librarians want to make up the catalog in the library.

• Journal of Digital Convergence
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• v.12 no.6
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• pp.259-264
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• 2014

Digital convergence means a service or new product which appeared through fusion of unit technologies in information and communication regions. In 2011, The Government introduced "IT Convergence Technology Prediction Survey 2025". Smart mobility is a main factor in smart city which is main example of convergence. A intelligent transport system(ITS) is a key factor of smart mobility. The conventional transport systems include road, car, signal systems. But the ITS is a transport system containing additional technologies such as electronics, control, communication to increase traffic safety and effectiveness of traffic facilities. In this paper, we described intelligent transport system related with our life.

• Journal of the KSME
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• v.33 no.10
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• pp.892-901
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• 1993

환경오염과 차량 성능향상에 따라서 날로 강화되는 연비규제는 차량용 변속기로서 CVT 양상 보급에 대한 필요를 앞당기고 있다. CVT는 소형차를 중심으로 일부 자동차 에이커에 의해 이미 실용화되어 있으며 일본 및 구미 자동차 각 사는 CVT에 대한 자체기술을 보유하고 경쟁성 있 는 완성품 개발을 위하여 총력을 기울이고 있는 실정이다. CVT에 대한 연구개발의 추세는 동 력전달 구동요소의 특성에 따라 벨트식과 토로이달 (Torodial)식으로 구분할 수 있으며 대부분의 경우 현재 일부 실용화 개발된 벨트식 CVT가 기술완성도가 높은 반면 토로이달롤러의 각도를 연속적으로 변환시킴으로써 무단변속을 이루는 토로이달 방식은 2000년대 이후에 양산을 목표로 일본 및 영국 등에서 개발 진행주이나 새로운 재질과 제어기술개발 등의 숙제를 안고 있다. 벨 트식의 경우 금속벨트는 지난 십 수년이상 시행착오를 겪으며 CVT용으로 개발된 전문업체의 제품이 이미 특허화되어 있기 때문에 자동차 각사는 벨트와 같은 구동요소보다는 CVT 메카니즘 설계 및 제어시스템 개발에 기술력을 투입하고 있다. 따라서 국내 CVT 개발도 이와 같은 추세를 따를 것으로 기대되고 있으나 AT와 같은 완성품으로서의 상품가치를 갖기 위하여는 CVT에 대한 보다 많은 연구개발이 필요하다고 생각된다.