• Publications of The Korean Astronomical Society
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• v.26 no.1
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• pp.37-44
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• 2011

We constructed a photometric database system which is optimally designed for microlensing events from KMTNet (Korea Microlensing Telescope Network) observation. We developed a framework software for the convenience of archiving, uploading, searching, and downloading of processed photometric data. From various tests for optimal data archiving engines, we found that the MyISAM storage engine shows the best performance. For the high performance of database system, data types of each field are carefully suggested from various combinations of tests especially to correct round-off errors. The developed framework provides the convenience of access to the database server using query forms via web pages, and displays the light curve of selected target for a quick view.

• Journal of Information Processing Systems
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• v.7 no.1
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• pp.209-220
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• 2011

One of the major factors influencing the phenomenal growth of the smart phone market is the active development applications based on open environments. Despite difficulties in finding and downloading applications due to the small screens and inconvenient interfaces of smart phones, users download applications nearly every day. Such user behavior patterns indicate the significance of smart phone applications. So far, studies on applications have focused mainly on technical approaches, including recommendation systems. Meanwhile, the issue of culture, as an aspect of user characteristics regarding smart phone use, remains largely unexamined throughout the world. Hence, the present study attempts to analyze the highest ranked smart phone applications downloaded and paid for that are ranked the highest in 10 countries (Korea, Japan, China, India, the UK, USA, Indonesia, Canada, France, and Mexico) and we then derive the CDSC (Cultural Dimensions Score of Content) for these applications. The results derived are, then, mapped to the cultural dimensions model to determine the CISC (Cultural Index Score for Country). Further, culturally significant differences in smart phone environments are identified using MDS analysis.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.1185-1187
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• 1998

The object of this study shows a program for supervisory control of the electric power distribution, approach to the more easy manipulations and hangulization that could be easily familiar to the domestic operators whereas the program, up to now, displayed only in English. This program is consist of a skeleton-diagram designer and a state-displayer of the electric power distribution To make skeleton-diagram data available in state-displayer, the designer must be performed with the proposed format in the program manual. States display executes downloading S/Ws-state-data externally and display the S/W informations at that times, and also power distribution simulation of voluntary S/W manipulations performed by the internal operators is possible.

• Proceedings of the KSMRM Conference
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• 2002.11a
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• pp.94-94
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• 2002

목적： 자기공명영상시스템의 스펙트로미터는 transmitter, receiver, gradient 등의 파형과 동작시간을 제어함으로써 원하는 pulse sequence를 구현한다. 이를 위하여 보통 여러개의 독립적인 DSP 보드를 사용하는 경우가 많은데, 이 경우 하나의 pulse sequence에 대하여 transmitter, receiver, gradient 에 대한 프로그램을 따로 작성해야 하므로 프로그램을 개발하는데 시간과 노력이 많이 소요되고, 프로그램의 변경이나 유지, 보수에 어려움이 많았다. 또한 프로그램간에 version이 다르거나, 또는 부분적으로 프로그램이 바뀌었을 경우 종종 error의 원인이 되기도 하였다. 본 연구에서는 개발하고자하는 pulse sequence에 대하여 하나의 프로그램으로 각 DSP 보드에 필요한 프로그램을 만들어주는 pre-compiler를 개발하였다. 개발된 pre-compiler는 통합된 개발 환경에 integration 되어, compile 과 downloading, debugging 등의 기능을 포함하고 있다.

• Proceedings of the Korea Society for Simulation Conference
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• 1996.05a
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• pp.15-15
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• 1996

A shop floor control system (SFCS) is the central part of a CIM system used to control the activities of several pieces of manufacturing equipment (e.g., NC machines, robots, conveyors, AGVs, AS/RS). The SFCS receives orders and related process plans, and then performs selecting a specific process routing, allocating resources, scheduling the workpieces, downloading the processing instructions (e.g., RS-274 instructions for NC machines, VAL II programs for robot), monitoring the progress of activities, detecting and recovering from errors, and preparing reports on the status of the manufacturing system. Simulation has been utilized in discovering control policies used for resolving shop floor be control problems such as resource contentions, part dispatching, deadlock. The simulation model must be designed to respond to real-time data coming from a shop floor. However, to rapidly build a realtime simulation model of SFCS cannot be easily accomplished. This talk is to address an automatic program generator of discrete event simulation model for shop floor control from process plans and resource models. The program generator is capable of constructing complete discrete simulation models for multi-product and multi-stage flexible manufacturing systems.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.53 no.5
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• pp.368-373
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• 2004

Surface visualization can be useful, particularly for internet-based education and simulation system. Since the mesh data size directly affects the downloading and operational performance, the problem that should be solved for efficient surface visualization is to reduce the total number of polygons, constituting the surface geometry as much as Possible. In this paper, an efficient polygon reduction algorithm based on Stokes＇ theorem, and topology preservation to delete several adjacent vertices simultaneously for past polygon reduction is proposed. The algorithm is irrespective of the shape of polygon, and the number of the polygon. It can also reduce the number of polygons to the minimum number at one time. The performance and the usefulness for medical imaging application was demonstrated using synthesized geometrical objects including plane. cube. cylinder. and sphere. as well as a real human data.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.227-230
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• 2006

A content-based image retrieval system using MPEG-7 is designed and implemented in this thesis. The implemented system uses existing MPEG-7 Visual Descriptors. In addition, a new descriptor for efficient retrieval of bio images is proposed and utilized in the developed content-based image retrieval system. Comparing proposed CBSD(Compact Binary Shape Descriptor) with Edge Histogram Descriptor(EHD) and Region Shape Descriptor(RSD), it shows good retrieval performance in NMRR. The proposed descriptor is robust to large modification of brightness and contrast and especially improved retrieval performance to search images with similar shapes. Also proposed system adopts distributed architecture to solve increased server overload and network delay. Updating module of client efficiently reduces downloading time for metadata. The developed system can efficiently retrieve images without causing server's overload.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.405-408
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• 2004

본 논문에서는 FPGA와 마이크로프로세서를 이용하여 One Board화된 무선 콘트롤러 시스템의 기저대역부를 설계 하였다. 송신부에서는 컴퓨터와 연결된 마이크로프로세서부에서 컴퓨터를 통해 입력된 데이터를 병렬로 FPGA부로 전송하여 PN_code를 이용한 대역확산 거쳐 전송하고, 수신부에서는 대역역확산를 사용하여 데이터를 다시 수신측 마이크로프로세서를 통해 확인하였다. FPGA 설계는 Xilinx사의 FPGA 디자인 툴인 Xilinx Foundation3.1을 사용하였으며, FPGA configuration을 위한 타이밍 시뮬레이션을 수행하였고. Xilinx사의 SPARTAN2 2S100PQ208칩에 downloading 한 후 Agilent사의 1681A logic analyzer를 사용하여 설계된 회로의 동작을 확인 하였다. 또한 데이터의 입출력을 CPU부를 통해 컴퓨터에서 모니터링 할 수 있도록 설계하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.11
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• pp.2166-2171
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• 2007

In this paper, we proposed a Sequential Download System(SDS) to provide high steaming QoS in p2p network. SDS is able to receive a media file simultaneously from multiple source peer by download manager and deal with unexpected leave of source peer. Also It can provide stable streaming services with minimum buffering delay and manage request of other peer by memory map in process of downloading.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.3
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• pp.27-40
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• 2004

Nowadays most web rages provide various services by downloading the applications program such as ActiveX Control or Java Applet. To provide code integrity and publisher authentication of downloaded software in internet, we need code signing technology. In this paper, Authenticode technology of Microsoft is lust analyzed. Based on the analysis, we propose code signing certificate profile and applying method for National Public Key Infrastructure.