• Journal of the Korea Society of Computer and Information
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• v.3 no.4
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• pp.110-119
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• 1998

This paper describes a C-API (Cryptographic-Application program Interface) mechanism that can serve cryptographic service to one or more application programmers in an open distributed computing system. Generic cryptographic service, provides application Programmers with cryptographic algorithms and interfaces which can be shared so that the programmers can program distributed applications containing security services even though they have no detailed knowledge of cryptographic algorithms. Therefore, in this paper, a generic C-API mechanism is designed that can be used independently from various application environments and basic system structures so that programmers can use it commonly. This mechanism has the advantage that allows application programmers be able to use some cryptographic services and key management services not considering of the application program and operating system.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.7
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• pp.708-712
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• 2008

Existing dynamic memory allocation schemes for general purpose operating system can not directly apply to the wireless sensor networks (WSNs). Because these schemes did not consider features of WSNs, they consume a lot of energy and waste the memory space caused by fragmentation. In this paper, we found features of WSNs applications and made the model which adapts these issues. Through this research, we suggest the slab allocator that reduces the execution time and the memory management space. Also, we evaluate the performance of our scheme by comparing to one of the previous systems.

• Journal of KIISE:Computer Systems and Theory
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• v.27 no.6
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• pp.558-566
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• 2000

Object recognition is a challenging application for high-performance computing. Currently, the superscalar architecture dominates todays microprocessor marketplace. As more transistors are integrated onto larger die, however, an on-chip multiprocessor is regarded as a promising alternative to the superscalar microprocessor. This paper examines the behavior of the object recognition on the on-chip multiprocessor, which will be employed in general-purpose parallel machines. To obtain the performance characteristics of the microprocessor, a program-driven simulator and its programming environment were developed. The simulation results showed that the on-chip multiprocessor can exploit thread level parallelisms effectively and offer a promising architecture for the object recognition application.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.201-203
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• 2015

Recently, rapid innovation of Smartphone is changing the paradigm of our daily life. Smartphone users, opinion experts more than 99 percent of the economically active population is using, it has reached the saturation past the early stages of formation. Smartphone is equipped with a general purpose OS possible the implementation of high performance environment similar level as a personal computer. Also, it is a mobile communication terminal scalable which can be removed or installed various applications. Such extensibility, it is possible to use different applications through the Apps store. In addition, it is also possible various services which are location based service. In this research, we aim to analyze factors influencing of the multimedia function on continue using intention of Smartphone In addition, we aim to analyze the causal relationship from perceived value to continue using intention. This study suggests practical and theoretical implications based on the results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.207-210
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• 2013

Recently, rapid innovation of Smartphone is changing the paradigm of our daily life. Smartphone users, opinion experts more than 99 percent of the economically active population is using, it has reached the saturation past the early stages of formation. Smartphone is equipped with a general purpose OS possible the implementation of high performance environment similar level as a personal computer. Also, it is a mobile communication terminal scalable which can be removed or installed various applications. Such extensibility, it is possible to use different applications through the Apps store. In addition, it is also possible various services which are location based service. However, these services also benefit many but it also has a disadvantage of invasion of privacy and disclosure of personal information. In this research, we aim to analyze factors influencing on perceived value and risk in location based service of Smartphone. In addition, we aim to analyze the causal relationship with perceived value and risk in satisfaction and recommendation intention. This study suggests practical and theoretical implications based on the results.

• Asia pacific journal of information systems
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• v.4 no.2
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• pp.83-130
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• 1994

Software development of large scale program such as Operating System or University Total Information System is lengthy and costly process. In order to reduce cost, time and risk, there is currentry general acceptance of the need for Software Reuse System during the whole development cycles. In this paper, (from a practical point of view), the problem of existing reuse system methodology is analyzed and an implement method of software reuse system is presented. Also using this method Application Program Reuse System(APRS) which supports all phase of software life cycles is designed and implemented. This application program reuse system which is based on common language is considerably shown to reduce communication Error of requirement specification between systems analyst and end-user.

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06c
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• pp.151-154
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• 1998

이중 전송율(5.3 과 6.3kbit/s)을 제공하는 G.723.1 음성 코더는 공중망을 통한 H.324 POTS 영상 회의 규격의 음성 코더로 채택된 것으로, MPMLQ, ACELP 알고리즘에 근거한다. 본 논문에서는 Annex A를 포함한 G.723.1 음성 코더 알고리즘을 C&S Technology에서 개발한 음성 신호 처리를 위한 범용 DSP인 CSD17C00 칩을 이용하여 실시간 응용이 가능하도록 구현하였다. G.723.1 에 대한 양방향 평가가 Codec loopback을 통해 수행되었으며, ITU에서 제공한 테스트 절차에 따라 평가되었다. 또한, 본 논문에서 구현된 G.723.1 음성 코더는 27MIPS의 계산 속도를 갖으며, 프로그램 ROM의 크기는 8.85K Words이고, 10K 데이터 ROM과 4K 데이터 RAM을 필요로 하고 있다. 경쟁 제품과의 MOS 측정 음질 평가를 실시한 결과, CSD17C00에서의 음질 성능이 더 우수함을 입증 함으로써, 본 논문에서 보여준 CSD17C00을 기반으로 구현된 G.723.1 알고리즘의 실시간 구현기술의 타당성을 검증하게 되었다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.678-682
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• 2000

The purpose of this study is to develop a powerful 6-axes general welding robot utilizing a low cost vision system. The developed vision system is composed of a CCD camera, a PC with windows 98 OS, and a PC-Robot communication program using Visual C++. A test was carried out to investigate whether the welding torch can precisely follow up the welding path. It shows that the result of this study can readily be applied to practical welding operations.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.52-55
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• 1999

다중 전송율(16, 24, 32, 40kbps)을 제공하는 G.726 부호화기는 ADPCM (Adaptive Differential Pulse Code Modulation) 부호화법을 사용한다. 본논문에서는 G.726 ADPCM 알고리즘을 C&S Technology에서 개발한 음성 신호 처리를 위한 범용 DSP인 CSD17C00A 칩을 이용하여 실시간 응용이 가능하도록 구현하였다. G.726에 대한 양방향 평가는 Codec Loopback test을 통해 수행되었으며, W-T에서 제공한 테스트 절차에 따라 평가되었다. 본 논문에서 구현된 G.726 부호화기는 평균 11 MIPS의 계산 속도를 갖고, 프로그램 메모리 크기는 2.8K Words이고, 데이터 메모리 크기는 550 Words 를 필요로 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.214-216
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• 2006

검사점 및 복구 도구는 사용자 응용 프로그램의 상태를 주기적으로 안정된 저장소에 저장을 하고, 결함이 발생하였을 경우 가장 최근의 검사점으로부터 효율적으로 복구하게 하는 도구이다. 특히 검사점 및 복구 도구는 장시간 수행되는 프로세스를 위해서는 아주 중요한 의미를 지니며, 결함으로 인해 장시간 수행되는 프로세스에 의해 생성된 중간 결과를 잃어버리지 않게 한다. 본 논문에서는 일반 범용 컴퓨터시스템 상에서 구현된 검사점 및 복구들을 리눅스 기반의 임베디드 시스템에 적용시켜 보고, 그 결과를 통해 임베디드 시스템상에서의 검사정 적용의 가능성을 알아본다.