• Journal of the Korean Society for Precision Engineering
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• v.21 no.6
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• pp.84-93
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• 2004

This study carries out the performance improvement and simplification of hydraulic modulator that plays an important role in vehicle stability control systems. The mathematical models for each component of a modulator, such as pump, wheel cylinder, check and solenoid valve, accumulator, damper are derived in detail. All the mathematical models are combined to form a modulator system and implemented through a computer program, which can be controlled by a user friendly GUI. To verity the simulation, comparison between simulation and experiments has been made. After the verification of the validity of the simulation, the effects of the design parameters of the modulator on the wheel cylinder pressure is investigated. The results show that the modulator without MPA has advantage in early time pressure rise rate, and it can be simplified.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.554-558
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• 2004

In this paper, we introduce noise prediction program of HVAC system to assist low-noisy design of ship's cabin. The developed program calculates sound power levels at HVAC components considering primary and secondary noise generated by fan and duct element, duct element noise attenuation, and duct break-in noise based on the authentic empirical method suggested by NEBB and acoustic power balancing method. Sound pressure level at cabin with or without ceiling system is evaluated by the diffuse-field theory considering diffuser and duct break-out sound powers. Moreover, the program provides intuitive pre- and post-processors using modem GUI functions to help efficient modeling and evaluation of cabin and HVAC component noise. To validate the accuracy and convenience of the program, noise prediction for a HVAC system is demonstrated.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.11a
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• pp.389-395
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• 2000

It is usually the contractual responsibility of HRSG(Heat Recovery Steam Generator) supplier to limit combustion turbine exhaust noise at cogeneration sites. Thus, it is necessary to predict the noise level from HRSG at the stage of preliminary design. HRSG is usually composed of inlet duct, main casing, outlet duct, stack. To satisfy the noise limit level, additional equipments are sometimes required - duct shroud, silencer. We develop algorithms for predicting the noise emission from all these equipments of HRSG units. For the convenience of user, we develop the GUI window version program, named NP-HRSG program. To evaluate the accuracy of this program, predicted noise levels from a real HRSG model are compared with measured data. Through this comparison, we observe that the maximum error is just about 3dB.

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.148-151
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• 2007

본 논문은 표면 부착형 영구자석 동기전동기 벡터제어 시스템의 속도 및 전류제어와 과변조 기법을 MATLAB/SINULINK의 TI C2000 임베디드 타겟을 이용한 모델기반 제어기 설계방법으로 구현하였고, Mathwork사에서 제공하는 Demo 프로그램의 속도 및 전류제어와 과변조 기법을 비교하여 보았다. 먼저 각 제어기에 대한 구조를 설명하고, 각각의 응답에 대한 시뮬레이션과 실험을 통해 비교 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.205-208
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• 2001

본 논문은 KCC 정보통신(주) e-RoadMap 웹 방법론에 적용한 컨텐츠, 데이터, 사용자인터페이스 모델이다. 이는 널리 알려진 구조적기법에 웹 어플리케이션을 개발하는 절차를 반영한 모델이다. 그러므로 기존의 방법론 사용자들에게 이해가 용이하다. 이벤트리스트와 웹 시나리오요구서를 통하여 사용자요구정의를 하고, 컨텐츠 모델은 기존의 엔터티 관계도를 이용하여 컨텐츠를 도출토록 하였으며, 프로세스 모델에서는 웹에 구현할 프로세스를 도출하였다. 사용자 인터페이스모델에서는 웹으로 구현할 항해설계 및 멀티미디어 설계를 반영하였다. 본 제안모델은 컨텐츠도출, 컨텐츠를 운용하는 프로세스도출 및 이들의 상관관계를 제시하고 있으며, 이를 통하여 사이트 구조 및 컨텐츠를 상세 정의토록 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.447-464
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• 2000

많은 사람들이 관심을 가지고 급속도로 발전하는 인터넷 환경의 웹 서비스 중에서 인터넷 뱅킹 시스템은 반드시 필요한 서비스 중의 하나지만, 아직까지 많은 보안상의 문제점을 내포하고 있다. 본 논문에서는 이런 보안상의 문제들 중에서 사용자 인증에 관한 부분, 데이터 암호화에 관한 부분, 키 분배 문제에 관한 부분을 해결할 수 있는 방안을 제시하려 한다. 이를 위해 공개적으로 사용이 가능한 암호 라이브러리인 Crypto++3.1을 이용하여 인터넷 환경에서 보안 서비스를 제공할 수 있는 안전한 인터넷 뱅킹 시스템인 SIBS(Secure Internet Banking System)을 설계 및 구현하였다. SIBS는 빠른 데이터 암호화 처리를 위해 IDEA암호 알고리즘을 사용하였다. 데이터 암호화에 사용할 키를 분배하기 위해서 Diffie-Hellaman키 분배 알고리즘을 이용한다. 또한, 사용자의 인증을 위해 X.509형식의 인증서를 이용하기 위해서 SSLeay를 설치하여 인증서(Certificate)를 발급 받는다. 그러므로, 사용자는 인터넷에서 SIBS의 GUI(Graphic User Interface)를 이용해 빠르고 편리한 접근이 용이하고, 암호 알고리즘에 대한 지식이나 특별한 조치가 없이도 빠른 데이터 암호화 처리와 인증서를 이용한 확실한 사용자 인증을 보장 받을 수 있다.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.2096-2100
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• 2008

This research project management, building systems to test the performance requirements of a user to accept the plan and schedule management, personnel management, and test results, and the status of testing and reporting procedures to handle the process of implementation of Java-based X - Under the Internet environment, the default network, remote process research and development program as a test automation, structure and each module of the software analysis, design, analysis and clean-up and structure of the modules, each module and the GUI structure, performance, testing integration DB The present system is to study the system.

• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.261-269
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• 2006

In this paper we has implemented a tour guide terminal using the embedded linux. The implemented terminal can locate its position using GPS interface and display the sightseeing information of the current location. With view of this implementation results, we confirmed the possibility of embedded linux terminal as a tour guide PDA. The realtime update of sightseeing information using a mobile communication functionality will be included in our future works.

• IEMEK Journal of Embedded Systems and Applications
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• v.6 no.3
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• pp.117-123
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• 2011

In this paper, we design the hardware platform and implement the embedded software based on the FPGA and the DSP for the automotive 77GHz FMCW radar system. This embedded software is built into the DSP as the multi-tasking architecture to support the basic target detection algorithm and the Ethernet link. The designed GUI(Graphic User Interface) provides ability to adjust parameters associated with the radar performance, to monitor signal processing results, and to download the raw received signal. The designed platform can be used to develop the optimal detection algorithms for the various applications.

• Journal of the Korea Society of Computer and Information
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• v.23 no.12
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• pp.65-72
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• 2018

In this paper, we have studied how to reuse common data link software by applying software product line engineering. Existing common data link software performed different stages of design, implementation, and testing without sharing the accumulated knowledge of different developers. In this situation, developers agreed that sharing the assets of each project and reusing the previously developed software would save human and time costs. Even with the initial difficulties, the common Data Link is a continually proposed project in the defense industry, so we decided to build a product line. The common data link software can be divided into two domains. Among them, the initial feature model for the GUI software was constructed, and the following procedure was studied. Through this, we propose a plan to build a product line for core assets and reuse them in newly developed projects.