• Review of KIISC
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• v.14 no.4
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• pp.10-18
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• 2004

상호운영성, 유연성, P2P(피어투피어), 역동성, 확장성 등 웹 서비스가 지닌 다양한 특성으로 인하여 웹 서비스 보안은 안전한 웹 서비스 운영을 위한 핵심요소라 할 수 있다. 웹 서비스의 기본 구성은 서비스 수요자와 제공자, 검색소로 구성되며 WSDL(Web Service Definition Language), UDDI(University Discovery and Integration of Business for Web), SOAP(Smple Object Access Protocol)등 세 개의 표준으로 서비스는 이루어진다. 이 중에서 특히 메시지 교환을 담당하는 통신 프로토콜인 SOAP는 웹 서비스 보안의 중심에 있으며, 웹 서비스 보안은 SOAP 메시지의 사용자 인증과 무결성, 기밀성을 보장하는 것으로 정의할 수 있다. SOAP는 HTTP를 통해 일반적으로 전송되므로 HTTP 상의 모든 위협을 가지게 되며 전송계층에 기반을 둔 보안을 생각할 수 있지만, 사실상 웹 서비스는 다수의 중간 중개자를 가질 수 있는 구조이기 때문에 단대단 보안(메시지 레벨의 보안)이 반드시 필요하다. 또한, 웹 서비스 상에서 단대단 보안을 보장하기 위해서는 각 객체와 키와의 연결이 중요하며 특정 객체에게 발행한 보안토큰의 신뢰성 화보를 위한 메카니즘을 필요로 한다. 본 논문에서는 이러한 보안 요구사항을 만족하기 위하여 XML 메시지 보안을 위한 전자서명 및 암호화 표준과 SOAP을 위한 W3C, OASIS의 통합표준을 중심으로 SOAP 메시지 보안기술을 분석하고자 한다.

• Journal of information and communication convergence engineering
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• v.11 no.2
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• pp.112-117
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• 2013

In order to reuse a register transfer level (RTL)-based IP block, it takes another architectural exploration in which the RTL will be put, and it also takes virtual platforms to develop the driver and applications software. Due to the increasing demands of new technology, the hardware and software complexity of organizing embedded systems is growing rapidly. Accordingly, the traditional design methodology cannot stand up forever to designing complex devices. In this paper, I introduce an electronic system level (ESL)-based approach to designing complex hardware with a derivative of SystemVerilog. I adopted the concept of reuse with higher levels of abstraction of the ESL language than traditional HDLs to design multiplication server farms. Using the concept of ESL, I successfully implemented server farms as well as a test bench in one simulation environment. It would have cost a number of Verilog/C simulations if I had followed the traditional way, which would have required much more time and effort.

• Annual Conference of KIPS
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• 2002.04b
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• pp.809-812
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• 2002

본 논문은 RSA 암호시스템에서 고속 모듈러 곱셈을 위한 최적화된 시스톨릭 어레이의 설계를 제안한다. 제안된 방법에서는 미리 계산된 가산결과를 사용하여 개선된 몽고메리 모듈러 곱셈 알고리듬을 제안하고, 고속 모듈러 곱셈을 위한 새로운 구조의 시스톨릭 어레이를 설계한다. 미리 계산된 가산결과를 얻기 위해 CLA(Carry Look-ahead Adder)를 사용하였으며, 이 가산기는 덧셈연산에 있어서 캐리전달 지연이 제거되므로 연산 속도를 향상 시킬 수 있다. 제안된 시스톨릭 구조는VHDL(VHSlC Hardware Description Language)을 사용하여 동작적 수준을 기술하였고, Ultra 10 Workstation 상에서 $Synopsys^{TM}$ 툴을 사용하여 합성 및 시뮬레이션을 수행하였다. 또한, FPGA 구현을 위하여 Altera MaxplusII를 사용하여 타이밍 시뮬레이션을 수행하였고, 실험을 통하여 제안한 방법을 효율성을 확인하였다.

• Annual Conference of KIPS
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• 2002.04b
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• pp.1041-1044
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• 2002

1990 년대 이후 NGIS(National Geographic Information System) 사업의 시작과 함께 활성화 되기 시작한 GIS 는 1990 년대 말 인터넷의 급속한 보급으로 인하여 비약적인 발전을 거듭하였다. 근래에 들어, 무선 인터넷의 확산과 함께 모바일 GIS 가 등장하게 되었으나, 기관이나 기업의 서로 상이한 GIS 데이터베이스는 중복투자와 함께 데이터베이스간의 이질성을 초래하였다. 본 논문에서는 국립지리원에서 제공하는 DXF(Drawing exchange Format) 형식의 국가기본 수치 지도를 지리정보의 저장과 전달을 위해 OGC(Open GIS Consortium)에서 제안한 GML(Geographic Markup Language)로 변환하는 시스템을 제안한다. 클라이언트로부터 위치정보와 축척정보를 입력받아 검색범위를 설정한 후, 검색된 DXF 를 GML 로 변환하여 클라이언트로 전송하고, 클라이언트는 전송 받은 GML 문서를 모바일 C 로 구현된 GML 파서를 통해 변환하여 모바일 디바이스의 화면에 출력하고, 사용자 상호작용을 수행한다.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.761-763
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• 1993

Recently the wide use of the microprocessor requests the UPS systems to have various functions. This paper describes the action of peripheral anti internal controller, and the display for current conditions and self-diagnosis such as over load and system fault, and the control algorithm design of UPS system with 1-1.5KW ratings. IBM PC/AT is used as the control system and Turbo PASCAL Ver 5.5 as control language.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.1940-1942
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• 2001

Magnetic Levitation System(MLS) levitates a steel ball to the desired position in the gravity field using electromagnetic force. MLS consists of light sensor to measure the position of steel ball and an electromagnet to control the position of the ball, that composes a feedback control system. This work does not use a steel ball with constant mass but variable mass steel balls as magnetic levitation targets. Differential equation of electric circuit for electromagnet and motion equation of the movement of steel ball are derived for modeling nonlinear system, that will be linearized at the nominal operating point. We propose a digital control that can levitate a steel ball of which weight is not known for ED-4810 system. Algorithm for estimating ball weight and feedback control are implemented in digital scheme under pentium PC equiped with A/D and D/A converter, ACL-8112, using C-language. Simulation and experimental results are given to show the usefulness of the proposed controller.

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.653-656
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• 2003

We have designed embedded web sewer system and ported Linux operating system version 2.4.5 at our system. And then We implemented to control and monitor widely separated hardware and implemented to monitor widely separated image using CMOS image sensor HV7131B. Web server is the Boa web server with General Public License. We designed for this system using of Intel's SA1110 ARM core base processor and connecting input and output device at GPIO port of SA1110. Device driver of General purpose I/O for Embedded Linux OS is designed. And then the application program controlling driver is implemented to use of common gate interface C language. User is available to control and monitor at client PC. This method have benefit to reduce the Expenditure of hardware design and development time against PC base system and have various and capacious application against firmware base system.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1998.06a
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• pp.47-56
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• 1998

Designing Trim die block is a complicated and time-consuming process heavily resting on the experience of the designer. To reduce design time and human errors, a knowledge base is used to automated the design process. In this paper, a framework of the Rule-based CAD System is presented for trim die block design consisting of a rule-base, design process control module and geometric modeler (CATIA). The rule-base includes design rules and know-how of design specialist. CATIA is used as the overall CAD environment and rule-base and design control modules are developed by C++ language with an interface to CATIA. Using the rule-base, the designer can explore alternating designs fast by changing design parameters and the part-list is automatically created which avoids miscommunication.

• Proceedings of the Korea Water Resources Association Conference
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• 2000.05a
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• pp.20-27
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• 2000

The grid-based KlneMatic wave STOrm Runoff Modei (Kim, 1998; Kim, et al., 1998) which predicts temporal variation and spatial distribution of saturated overland flow, subsurface flow and stream flow was evaluated at two watersheds. This model adopts the single overland flowpath algorithm and simulates surface and/or subsurface water depth at each cell by using water balance of hydrologic components. The model programed by C-language uses ASCII-formatted map data supported by the irregular gridded map of the GRASS (Geographic Resources Analysis Support System) GIS and generates the spatial distribution maps of discharge, flow depth and soil moisture of the watershed.

• Journal of the military operations research society of Korea
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• v.27 no.2
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• pp.134-148
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• 2001

In this paper, air-defense simulation model, called "DADSim", will be introduced. DADSim(Distributed Air Defense Simulation Model) was developed by Modeling&Simulation Lab of K.N.D.U.(Korea National Defence Univ) Weapon Systems Department. This model is an analysis-purpose model in the engagement-level. DADSim can simulate not only the global air-defense or Korean Peninsula but also the local air-defense or a battle field. DADSim uses the DTED(digital terrain elevation data) LeveII it for the representation of peninsula terrain characteristics. The weapon systems cooperated in the model are low/medium-range missile systems such as HAWK, NIKE, SAM. DADSim was designed in the way of object-oriented development method, implemented by C++ language. The simulation view is an event-sequenced object-orientation. For the convenience of input, output analysis, GUI(Graphic User Interface) of menu, window, dialog box, etc. are provided to the user, For the execution of DADSim, Silicon Graphic IRIX 6.3 or high version is required. DADSim can be used for the effectiveness analysis of­defence systems. Some illustrative examples will be shown in this paper.