• KIEAE Journal
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• v.13 no.1
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• pp.151-157
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• 2013

Since high-rise building construction sites are usually located in crowded city areas, sufficient spaces for the inventories of key materials are rarely available. This spatial constraints have been one of the critical challenge that may cause productivity loss and increasing costs of the high-rise building construction projects. The proper material inventory management is certaing a key to the success of high-rise building construction projects as it handles difficulty of securing material stock yards, changes in demands, uncertain delivery time through integrating the construction schedules and actively responding to the key materials attributes. In this light, this research analyzes the latest inventory model, (Q,r) model, in accordance with the high rise building characteristics. This research suggests an optimal inventory management of re-bar considering various demands and lead times. The case study is also presented with regard to the re-bar inventory management.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.5
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• pp.9-15
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• 2013

In this paper, automatic recognition of an accident and whether service delivery and risk driving through the giving of the driver to correct driving habits before and after the accident to reproduce highly scalable video Smart Mobile Blackbox DVR (SMBD, Smart Mobile Blackbox DVR) Computer of the model was designed. SMBD on embedded systems equipped with wireless capabilities to sleep in the car accident point and the image information by wireless communications, by notification in the control center, 24-hour emergency rescue service and traffic information can be provided. The vehicle ECU (Electronic Control Unit) of the vehicle information and sensor data in conjunction with wireless eCall (Emergency Call) services can be realized.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.447-450
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• 2010

Today a relatively small reservoirs and reclamation insufficient freshwater Agricultural Water Quality to collect and analyze information online, Analyzed in real-time information delivery and database hwahameurosseo agricultural water quality management of reservoirs and freshwater lakes can be systematically. In this paper, a remote user to automatically measure water and measured to provide information collected from each sensor and integrate information connected to your wireless network and Integrated control measures as well as real-time monitoring of the operational point of observation from a web site in real-time information about the water to retrieve the user's computer and the user consists of a mobile communication terminal.

• Journal of Appropriate Technology
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• v.6 no.1
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• pp.45-50
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• 2020

We developed the world's first wireless ultrasound diagnostic device. For the smooth delivery of pregnant women, the WHO requires four prior examinations, and the use of ultrasound diagnostic devices is essential for this purpose. However, income levels and medical facilities in developing countries are falling short. We conducted KOICA's CTS program in Vietnam using a self-developed radio ultrasound diagnostic device. We supplied Sonon300C, a portable wireless ultrasound diagnostic device, to health centers and hospitals in Huong-Hoa district, Vietnam, and conducted an outreach program in an effort to further enhance business performance. As a result, the rate of ultrasound diagnostics in the region reached 100% and the percentage of trained graduates increased to 59%.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.501-502
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• 1992

This paper deals with the experiment of CW YAG laser for processing. The YAG laser is spotted very small size beam compared with $CO_2$ laser having short wave-length. That is used broadly in material processing because of easy reaction to the materials, and the maintenance is very simple. The power delivery and focussing is done conventional optical components, and splitting beam is used many point stop-welding. In these studies, especial interest is nesessary to perpare for future technology. Our study aims to develop the YAG laser system and to accumulate design and construction technology. In basic experiments, we obtain the maximum output power of 50 W with the single elliptical cylinder.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.5
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• pp.487-497
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• 2003

There have been many filtering systems covering mail or news. Documents filtered by them consist of general text or HTML. XML is emerging as a new standard for information exchange. So, filtering systems need new approaches in dealing with XML documents. Our system suggests a method to describe user profiles with XML's ability to represent schema and structure. An user profile is made from DTD information and it is supposed to point the specific part of a document conforming to the DTD. More, it is different from the existing systems in extracting part of a document. An user profile is reflected in XML query to get part of an XML document.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.974-976
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• 2022

코로나19 확산 이후 온라인 주문 배달 음식 시장 규모가 커짐에 따라 다양한 음식 배달 모바일 플랫폼이 상용화되고 있다. 기존 배달 서비스의 기능 및 사용자 인터페이스(UI)를 분석한 결과, 비시각장애인의 관점에서만 편리성이 확보되고 있다는 것을 파악했다. 또한 시각장애인을 대상으로 한 인터뷰를 통해, 기존 배달 애플리케이션의 복잡한 UI로 인해 많은 시간이 소요된다는 문제점을 알 수 있었다. 이에 본 연구에서는 시각장애인 대상의 인터뷰와 관찰을 기반으로 사용자의 pain point를 극복할 수 있는 사용자 경험 중심의 배달 플랫폼을 개발하고자 한다. 서비스 이용 과정의 간소화, 시각 장애인을 위한 맞춤형 UI 제공, 접근성 강화를 통해 플랫폼 구성을 차별화한다. 이를 통해 시각장애인 사용자의 배달 플랫폼 이용을 수월하게 하고 장애인의 편리한 생활을 보장하기 위한 서비스들이 향후 많이 개발될 수 있도록 동기를 부여한다. 또한, 본 연구를 확장하여 '시각장애인의 키오스크 사용 관련 이슈 해결 방안'을 향후 연구 주제로 제안한다.

• Journal of KIISE:Information Networking
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• v.28 no.4
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• pp.578-585
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• 2001

IP Multicast that provides best-efforts service does not guarantee reliable delivery of multicast packets. In recent years, there are many approaches to support reliable multicast, but those are insufficient for implementing scalable and reliable multicast over Internet. We propose a Reliable Multicast Architecture(RMA) for scalable and reliable multicast. The RMA model guarantees reliability using a receiver initiated retransmission mechanism, and scalability using a feedback suppression mechanism by Multicast Router(MR). Furthermore, it utilizes underlying multicast routing information to minimize the cost of protocol modification and overheads. Our performance analyses show that RMA is much superior to previous works in the point of scalability and compatibility.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.712-714
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• 2005

With rapid growth of industry, underground power delivery systems are growing so rapidly and its capacity also growing. So if there are any accident in underground power cable, its inference is too great to count. So power system operators should find Its fault location as soon as possible and replace it But it is difficult to find its fault location for underground power cable. We are developing fault location system for underground power cable which can detect its fault location exactly. This system usually monitor underground power cable on-line But if there are an accident, it record Its transient signal and we can calculate fault location by analyzing it. To develop fault location system for power cable, we needed fault simulation system and we installed it physically and tested at various point. in this thesis, we describe on signal processing technology to detect fault location on power cable and on the result of tested fault location performance.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1047-1051
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• 2006

우리나라는 산업화 이후 많은 인공 저수지를 건설하였으며, 이후 부영양화 등의 수질 악화로 하천 및 호소의 오염은 심각한 상황에 놓여있다. 이에 대해 점오염원에 대한 대책을 마련하였지만, 하천 및 호소의 오염저감에 한계를 드러내었으며 그 원인을 비점오염원에서 오염물질이 대량으로 하천 및 호소에 유입되기 때문인 것으로 추정하고 있다. 이에 본 연구에서는 화성호의 주요 유입하천(남양천, 자안천, 어은천) 유역의 오염원 조사와 유입하천의 강우시기별 수질 및 유량조사를 통하여 오염부하량의 산정 및 유입하천의 오염부하량 유달율을 산정함으로써, 비점오염원에 대한 보다 명확한 대책 마련을 위한 기초 자료로 활용하고자 하였다. 강우시 수질 및 유량조사 결과, 유입하천의 유량은 강우 사상과 매우 큰 관계를 지니며, 강우 강도 및 강우 지속 시간 등의 변화에도 많은 유출 특성의 변화가 일어나는 것으로 조사되었다. 월별 유달율 산정 결과 홍수기에 가장 높았으며, 이는 강우의 집중으로 인한 비점오염물질에 의한 영향으로 판단된다. 강우시의 유달율이 높게 나타난 것은 강우시에는 점 및 비점오염원 모두에서 비점오염 형태로의 유출 가능성이 커 이에 대한 집중적인 관리가 필요할 것으로 판단되며, 유달율 산정으로 하천 수계 특성에 적합한 소유역의 유달율 적용을 통해 점 및 비점오염원에 대한 효율적인 관리를 위한 자료로 이용함으로써 하천 및 수계 관리를 위해 보다 실효성 있는 관리 방안을 마련할 수 있을 것이다.