• Journal of Sensor Science and Technology
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• v.17 no.3
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• pp.236-244
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• 2008

The Korean government is building several futuristic cities, ubiquitous City (u-City), with the latest information technology (IT) infrastructure and "ubiquitous" environment. In the "u-City", Intelligent Transportation System (ITS) will be one of the important services. This study proposed a traffic responsive urban traffic control system applicable in those u-City, using RFID (Radio Frequency Identification) technology to get traffic information. And, we proposed a predictive control model using the real time traffic information achieved from the proposed system. A simulation example is provided to demonstrate the applicability of the proposed system and model.

• Journal of Computing Science and Engineering
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• v.6 no.4
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• pp.280-286
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• 2012

The last decades have witnessed an increasingly indispensible role of high performance computing (HPC) in science, business and financial sectors, as well as military and national security areas. To introduce key aspects of HPC to a broader community, an HPC session was organized for the first time ever for the United States and Korea Conference (UKC) during 2012. This paper summarizes four invited talks that each covers scientific HPC applications, large-scale parallel file systems, administration/maintenance of supercomputers, and green technology towards building power efficient supercomputers of the next generation.

• Journal of information and communication convergence engineering
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• v.6 no.2
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• pp.228-232
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• 2008

In recent years, wireless ad hoc networks have become increasingly popular in both military and civilian applications due to their capability of building networks without the need for a pre-existing infrastructure. Recently, IEEE 802.11 Task Group e has been working on a new mechanism, the Enhanced Distributed Coordination Function (EDCF), to enhance the performance of 802.11 DCF. However, EDCF only reduces the internal collisions within a station, and external collisions between stations remain high in ad-hoc networks. In this paper, we propose to adopt an adaptive backoff window control technique, based on a dynamic value of the initial value of the range in which the backoff is chosen, so the backoff timer is randomly chosen in the range (InitRng, CW-1). We use ns-2 simulation to evaluate the throughput of our scheme. Results show that the throughput is improved for our scheme compared to the original DCF due to the reduced the number of collisions.

• Journal of Korea Multimedia Society
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• v.19 no.3
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• pp.539-547
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• 2016

Automated guided vehicles (AGVs) are widely used in industry. Several types of vision-based AGVs have been studied in order to reduce cost of infrastructure building at floor of workspace and to increase flexibility of changing the navigation path layout. A practical vision-based guideline tracing method is proposed in this paper. A virtual tracing wheel is introduced and adopted in this method, which enables a vision-based AGV to trace a guideline in diverse ways. This method is also useful for preventing damage of the guideline by enforcing the real steering wheel of the AGV not to move on the guideline. Usefulness of the virtual tracing wheel is analyzed through computer simulations. Several navigation tests with a commercial AGV were also performed on a usual guideline layout and we confirmed that the virtual tracing wheel based tracing method could work practically well.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.165-169
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• 2009

도로, 교량, 하폐수처리장, 공동구와 같은 도시기반시설은 u-City 구축에 있어 근간이 되는 요소로서, 도시민에게 편리한 삶을 제공해주는 동시에 지속적인 유지관리가 수반되어야 할 시설들이다. u-City는 이러한 도시기반시설을 u-IT기술을 활용하여 융복합, 지능화 함으로써 도시민에게 보다 유이한 서비스를 제공하고, 관리자에게 보다 효율적인 유지관리 업무를 수행할 수 있도록 하는 공간으로서, 현재 이에 대한 연구개발이 활발히 진행되고 있는 추세이다. 본 논문에서는 이러한 취지에서 도출된 도시기반시설 서비스와 관련 요소기술 개발 내용을 소개하고, 현장 적용성 시험에 필요한 테스트 베드 구축 내용을 고찰하고자 한다. 이 테스트 베드는 현장 적용 상태에서의 성능을 검증하고 실용 가능한 수준으로 고도화 하기 위하여 구축된 횡단보도가 포함된 왕복 6차선 도로로서, USN 센서 및 싱크노드, 봉합 콘트롤러가 설치되어 원격으로 상황을 감시할 수 있도록 구성되어 있다.

• Journal of Environmental Science International
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• v.23 no.7
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• pp.1213-1221
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• 2014

In the background of rapid urbanization and frequent earthquakes, earthquake disaster prevention planning has become an important topic of current research. Universities are irreplaceable disaster shelter, as they are public institutions with a lot of open space. This article puts forward the concept of "disaster prevention campus". With the refuge behavioral and psychological characteristics of people in the campus when the earthquake happens, it integrated uses GIS spatial analysis technique, takes Shandong Agricultural University as an example, and studies the spatial pattern of earthquake disaster prevention planning in campus from five aspects. The aspects include building distribution, population distribution, analysis of service radius, infrastructure configuration and choice of the optimal refuge path. On the basis of researches above, reform proposals and specific strategies are put forward to build the safe and harmonious disaster prevention campus.

• Journal of Korean Society for Quality Management
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• v.30 no.1
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• pp.22-46
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• 2002

Recently, increasing attention has been paid to building the software quality and software productivity due to ongoing software crisis. To overcome such problem, one of the many alternatives is to use the capability maturity model (CMM) suggested by the Software Engineering Institute(SEI), focusing on the improvement of software progress. This research is proposed the theoretical framework for CMM based on the previous studies, and review the status of software process on the software development organization. We then examine the impact of the software process capability on the organizational performance including financial measures and non-financial measures. Hypotheses on software process capability were tested 144 organizational units. The 62.5% of foreign companies are distribute to the second and third level, the Korean firms in this study are indicated the first level. Result indicate that maturity of software process may be served the key predictor of organizational performance, in particular the positive relationship between the software process and non-financial performance index such as customer service, IT Infrastructure, marketing, supplier and purchaser, production and operation.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2002.09a
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• pp.371-378
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• 2002

The design concepts using vibration reduction techniques, or structural control, have been proposed recently to protect infrastructure against earthquakes. The magnetorheological(MR) fluid damper is one of the most promising new devices for structural vibration reduction because of its mechanical simplicity, high dynamic range, low power requirement, large force capacity and robustness. In this study, the seismic performance of MR devices are compared with that of NZ systems as an attempt to provide some data for improving seismic design techniques applied to structures. For nonlinear time domain analysis of a base isolation system, a six-story building model is considered as a numerical example. The ground acceleration data of El Centre 1940, Mexico City 1985 and Kobe 1995 earthquakes are used as seismic excitations. The results show that MR damper systems for outperform NZ systems in wide-ranging seismic excitations with respect to intensity and period characteristics.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.850-856
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• 2010

With skyrocketing number of people who use smartphone, the technology of wireless internet that is mobile-phone, Wi-Fi, Wibro, HSDPA has been developed remarkably. The environment that one can use wireless internet easily and inexpensively anywhere has been made. So, the customer of railway have needs and desire that could use the wireless internet network as travelling in rolling-stock. Although KTX, KTX-II and some subway agency has built-up wireless internet network and serviced it, it's closed infra and inconvenient environment has been criticized. So, we survey the wireless internet network that is serviced at present and the way to build wirelee internet infra to satisfy the needs of customers.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.14
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• pp.373-395
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• 2000

Recently international trade environment has been rapidly changed according to information age. In particular, international trade has been carried out with various ways under the digital revolution. In this regard, the companies are handling their business with the open network internet and doing their critical marketing activities which are very different from the existed trade customs. However, trade-related information database which is necessary to import and export activities is partly built, and there are many issues to be settled down. In other words, electronic trade opportunity website in the field of overseas marketing and customs clearance with EDI(electronic data interchange) are developed, but the database which companies can make use of their businesses is not fully supported. Therefore the structured database should be developed urgently from the stage of opening business to that of payment. This study closely analyzes the databases under the trade procedure, look into the problems of those database and suggest the solutions of trade information databases. Finally this study provides a sort of trade infrastructure for the development of international trade by internet through the building of trade information.