• The Magazine of the IEIE
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• v.30 no.8
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• pp.64-64
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• 2003

국내외적으로, 2.3GHz 대역의 휴대 인터넷 서비스와 이동 고속 무선 패킷 데이터 MBWA(Mobile Broadband Wireless Access) 서비스를 위한 기술 개발 및 표준화 작업이 진행중이며, 이들 기술 표준에서는 데이터 속도의 고속화를 달성하기 위하여 AMC(Adaptive Modulation and Coding)를 요구하고 있다. AMC방식 무선 패킷 시스템은 서비스 지역 내에서 SNR(Signal to Noise Ratio)의 값에 연동하여 가변적인 데이터 서비스 속도를 제공하게 되고, 사용자가 서비스 지역을 이동하면서 제공받는 서비스 품질은 물리 채널의 서비스 속도 변화에 대응하여 변화되므로, 서비스 사업자는 서비스 사용자의 속도 품질을 일정하게 유지하고 관리 제어할 수 있도록 하는 서비스 품질 설계 기준이 필요하다. 따라서, 본 기고문에서는 이들 AMC 방식의 고속 무선 패킷 서비스 시스템 기술의 표준화에 병행하여 공중망 무선 패킷 서비스 시스템의 망 구축 설계시 고려되어야 할 가입자 수용용량과 서비스 품질 등을 산정하고 관리하기 위한 파라미터로서 기지국의 평균 데이터 공급 용량 MDT(Mean Data Throughput), 평균속도 공유 패킷 링크 MSPL (Mean Shared Packet Link) 그리고 서비스 Uniformity 지수 UI(Uniformity Index) 등을 제안하고자 한다.

• The Magazine of the IEIE
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• v.30 no.8
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• pp.844-852
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• 2003

국내외적으로, 2.3GHz 대역의 휴대 인터넷 서비스와 이동 고속 무선 패킷 데이터 MBWA(Mobile Broadband Wireless Access) 서비스를 위한 기술 개발 및 표준화 작업이 진행중이며, 이들 기술 표준에서는 데이터 속도의 고속화를 달성하기 위하여 AMC(Adaptive Modulation and Coding)를 요구하고 있다. AMC방식 무선 패킷 시스템은 서비스 지역 내에서 SNR(Signal to Noise Ratio)의 값에 연동하여 가변적인 데이터 서비스 속도를 제공하게 되고, 사용자가 서비스 지역을 이동하면서 제공받는 서비스 품질은 물리 채널의 서비스 속도 변화에 대응하여 변화되므로, 서비스 사업자는 서비스 사용자의 속도 품질을 일정하게 유지하고 관리 제어할 수 있도록 하는 서비스 품질 설계 기준이 필요하다. 따라서, 본 기고문에서는 이들 AMC 방식의 고속 무선 패킷 서비스 시스템 기술의 표준화에 병행하여 공중망 무선 패킷 서비스 시스템의 망 구축 설계시 고려되어야 할 가입자 수용용량과 서비스 품질 등을 산정하고 관리하기 위한 파라미터로서 기지국의 평균 데이터 공급 용량 MDT(Mean Data Throughput), 평균속도 공유 패킷 링크 MSPL (Mean Shared Packet Link) 그리고 서비스 Uniformity 지수 UI(Uniformity Index) 등을 제안하고자 한다.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.193-195
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• 2002

This paper presents the methods to solve the problem about Power System Protection Program(PROSET) and describe the database relation and schema with UML. PROSET is a overall program system to protect power system and correct it. In the context of the PROSET it is so difficult to edit database data when topology is changed. When the renewal of data is performed. all changed values are disappeared. Therefore, it will not be expected to know the present situation by using the information of the databases data. So it is necessary to solve this problem. Solution is copy of the user. Only E.R diagram is used to express database schema and relation. So, in this paper, UML(Unified Modeling Language) will be used to express PROSET and database of MCD-H and MDT-H.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1198-1206
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• 2009

Peripheral devices of OBCS in kyeongbu KTX serve various function. those services operate to make sure the safety of trains by displaying some malfunction signs of system and help maintain them appropriately. and they also provide various services for passengers in KTX. They divide into TECA which supports drivers with various data, PID which displays where to go, FDTR, HVAC, MDT etc. To develop superannuated devices, maintain and check its malfunction., we need to analyse hardware specification, OBCS and also protocol for communication devices simultaneously. here, we're trying to find how to find efficient approach by using a protocol analyser properly. We're going to develop peripheral devices to elevate and improve maintenance functions by collecting, compiling data.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.693-696
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• 2004

무선 컴퓨팅 기술 및 이동 객체의 위치를 정확하게 추적할 수 있는 GPS 기술의 발달로 인하여 물류 차량 관리, 항공 교통 통제 등과 같은 실시간 환경의 위치 정보 응용시스템의 개발이 활발해지고 있다. 특히, 지리정보와 위치정보를 이용한 현장업무처리 시스템과 차량의 위치를 관제 센터에서 실시간으로 파악하는 차량 위치 추적 시스템에 관한 연구가 대표적인 응용 시스템으로 등장하였다. 이러한 변화에 따라 이동성을 지원하는 무선 단말기를 기반으로 한 Mobile GIS 환경에서의 위치 정보 활용은 큰 관심을 불러일으키고 있으며, 또한 이러한 서비스를 효율적으로 제공하기 위해서 위치 기반 서비스 (LBS:Location Based Service)의 기술개발이 필요하게 되었다. 본 논문에서는 전력설비 고장복구업무에 LBS를 적용하기 위해 차량에 장착하는 MDT에서 국가기본도와 전력설비도 지리정보 서비스가 가능한 Mobile GIS Engine을 설계하고 구현한 결과를 제시한다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.9 no.2
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• pp.48-55
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• 2010

This paper proposes a realtime tracking algorithm of mobile object in indoor or outdoor environment. For this purpose the proposed system selects location data closer to mobile objects in real time using Triangulation method and DCM (Database Correlation Method). Also, this system utilizes the adjusted location data selected by using Kalman filter to improve the location accuracy of transfer object. Be studied in existing the Kalman filter have unstable location data until its settlement because of it extracts current values by using the past the information. However, proposed location tracking system don't apply existent Kalman filter to this system and it permits precisional tracking location by using more effective methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.106-111
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• 2004

A data communication should be carried out by a SSB(Single Side Band) to collect real time position data of fishery ship automatically, and a study on the protocol for exchanging the information with GPS should be made. A research about regional and concentrated maritime information should be first made to obtain ship's voyage data and also, research of the Modem and transmitter-receiver controller for sending voice and data simultaneously through a SSB and of the acquisition of data through a GPS also should be carried out.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.3
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• pp.747-754
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• 2014

In spite of its usefulness for health monitoring of structures on steady external load, the statistical pattern recognition technology (SPRT), based on Mahalanobis distance theory (MDT), is not good enough for the health monitoring of structures on large variability external load like earthquake. Damage is usually determined by the difference between the average measured value of undamaged structure and the measure value of damaged one. So when external variability gets larger, the difference gets bigger along, which is thus easily mistaken for a damage. This paper aims to overcome the problem and develop an improved Mahalanobis distance theory (IMDT), that is, a SPRT with revised MDT in order to decrease external variability so that we will be able to continue to monitor the structure on uncertain external variability. This method is experimentally tested to see if it precisely evaluates the health of a cable-stayed bridge on each general random load and earthquake load. As a result, the IMDT is found to be valid in locating structural damage made by damaged cables by means of data from undamaged cables. So it is proved to be effectively applicable to the health monitoring of bridges on external load of variability.

• Korean Journal of Poultry Science
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• v.38 no.2
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• pp.89-96
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• 2011

The outbreak of Newcastle disease occurred for the first time at a commercial chicken farm near Ulaanbaatar, Mongolia in August 2010. Newcastle disease virus (NDV) obtained from infected chickens in Mongolia was characterized by biological and molecular biological approches. Mongolian NDV isolate killed all of chicken embryos within 60 h in the mean death time assay, indicating virulent for chicken. A genomic region of 695 nts between nts 1055 of the M gene and 508 of the F gene was amplified by RT-PCR and sequenced. The deduced amino acid sequence of the F protein cleavage site was $^{112}RRQKRF^{117}$, which is a typical sequence of velogenic strains of NDV and is agreement with the result of the MDT assay. The sequence of the partial F gene (nts 47 to 435) was used for genotyping by phylogenetic analysis. The phylogenetic analysis showed that the Mongolian isolate was of genotype VII within class II of NDV. Further phylogenetic analysis on the genotype VII strains revealed that the isolates placed in a genetic sublineage of VIId and most closely related with velogenic strains of NDV circulating in Far-east Asian region especially China, suggesting the introduction of velogenic NDV into Mongolia from neighboring countries.

• Journal of the Korean Society of Industry Convergence
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• v.7 no.4
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• pp.377-382
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• 2004

This research was about implementing STEP for data exchange among different commercial package(CAD system). STEP was used to share CAD data as follows. ST-Developer implement Solid model was used with a physical file of STEP and represented in a CAD system. And then STEP conversion utility was used to make a neutrality format form in a component modeling. Analysis of Solid model was made possible for CAD system to read in and analyzed Solid model. This research are summarized as follows 1. A basis Model development used Visual C++ for a neutrality data of a programming interface general-use CAD system, and produced Box and Cylinder to a physical file, the result was implemented this in a programming interface to general-use CAD system, it is represented in CAD system as identical one modeling object. 2. STEP was used in different CAD system to utilize to its of each CAD system maximum, CATIA V5R9 user was able to analyze MDT 6 Modeling Arm. 3. STEP was used able to interpret and remodel the existing Solid model.