• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.52-57
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• 2007

한정된 자원을 효율적으로 사용해야하는 이동통신망에서 멀티미디어 서비스 요구에 따른 무선 트래픽 채널을 할당하는 기법은 무선이라는 특수 환경으로 인해 제약을 받을 수밖에 없다. 이동망의 기지국의 경우 여러 무선 가입자 보드로부터 요구되는 서비스별 트래픽요구에 대한 채널 할당과 이에 대한 메인보드에서 처리해야 하는 작업 스케줄링은 무선과 CPU라는 서로 다른 환경을 잘 매핑하는 과제를 안고 있다. 본 논문에서는 음성과 데이터 호를 동시에 서비스하는 셀룰러 시스템에서 멀티미디어 서비스 트래픽 특성을 고려한 주파수할당과 작업 스케줄링이라는 두 가지 요소를 접목할 때 인공지능알고리즘인 유전자알고리즘을 이용하는 방법과 이에 적합한 작업 스케줄링 방식을 제안한다.

• Proceedings of the Korean Society for Quality Management Conference
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• 2004.04a
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• pp.548-555
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• 2004

현재 변전소의 감시 및 제어 설비로 활용되고 있는 집중감시제어반은 24시간 상시 운전상태로 운영되기 때문에 컴퓨터의 CPU 및 메인보드, 하드디스크 등의 노후화로 인해 개개의 특성 및 기능이 저하되고 있다. 도입된 지 10년 가까이 지난 집중감시제어반에 대한 효율적 교체가 불가피하게 되었다. 이에 대한 최적 교체주기에 대한 합리적인 결정을 하기 위해서 신뢰분포함수와 평균사용일수(MTTF)를 구하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.799-801
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• 2004

무선랜과 시리얼 통신장치를 지원하는 센서들을 활용하는 원격 소음(Noise) 계측 유비쿼터스 컴퓨팅 플랫폼을 개발하였다. 먼저 유비쿼터스 컴퓨팅 플랫폼을 개발하기 위하여 시리얼 통신을 지원하는 테스터를 이용하였다. COTS (Commercial Off The Shelf) 개념을 활용하기 위하여 무선랜과 시리얼 통신을 지원하는 PDA를 메인보드로 사용하였다. 구현된 플랫폼은 건설용 중장비의 소음을 원격환경에서 계측하는 응용에서 활용되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.259-262
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• 2004

본 논문에서는 무선 랜과 시리얼 통신장치를 지원하는 센서들을 활용하여 무선 환경에서 원격으로 진동 및 소음을 계측할 수 있는 유비쿼터스 컴퓨팅 플랫폼을 개발하였다. COTS (Commercial Off The Shelf) 개념을 활용하기 위하여 무선 랜과 시리얼 통신을 지원하는 PDA를 메인보드로 사용하였다. 구현된 플랫폼은 건설용 중장비의 소음을 원격 환경에서 계측하는 응용에 활용하였다.

• Journal of IKEEE
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• v.25 no.3
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• pp.485-492
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• 2021

In this paper, we propose the development of a defect inspection system for polygonal containers. Embedded board consists of main part, communication part, input/output part, etc. The main unit is a main arithmetic unit, and the operating system that drives the embedded board is ported to control input/output for external communication, sensors and control. The input/output unit converts the electrical signals of the sensors installed in the field into digital and transmits them to the main module and plays the role of controlling the external stepper motor. The communication unit performs a role of setting an image capturing camera trigger and driving setting of the control device. The input/output unit converts the electrical signals of the control switches and sensors into digital and transmits them to the main module. In the input circuit for receiving the pulse input related to the operation mode, etc., a photocoupler is designed for each input port in order to minimize the interference of external noise. In order to objectively evaluate the accuracy of the development of the proposed polygonal container defect inspection system, comparison with other machine vision inspection systems is required, but it is impossible because there is currently no machine vision inspection system for polygonal containers. Therefore, by measuring the operation timing with an oscilloscope, it was confirmed that waveforms such as Test Time, One Angle Pulse Value, One Pulse Time, Camera Trigger Pulse, and BLU brightness control were accurately output.

• Journal of KIISE
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• v.42 no.8
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• pp.947-953
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• 2015

PRAM is being considered as a potential successor to DRAM because of its characteristics such as byte-addressability, non-volatility, and high density. To gain its benefits, buffer cache replacement algorithm based on PRAM has been actively studied. However, most of the previous studies on buffer cache replacement algorithm limitedly exploit the byte-level performance of PRAM by focusing its limited lifetime and slower access latency compared to DRAM. In this paper, we propose a novel buffer cache replacement algorithm that fully considers the byte-level performance of PRAM and the performance of secondary storage. To take advantage of small size write on PRAM, proposed scheme keeps pages, which are frequently accessed with a small size write, on PRAM and allows the selective page migration from DRAM to PRAM. As a result, our scheme significantly reduces the number of PRAM writes. Our experimental results indicate for real workloads that our scheme reduces the number of PRAM writes by up to 92% and improves its performance by up to 62% compared to CLOCK.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.129-132
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• 2003

In this paper, which sees the Strong-ARM SA1110 it used the main CPU and RTP in VoIP system. It will be able to apply the information communication field it embodied. It used the Tynux_box2 with the hardware side and it composed a VOIP system. And it used the RTP which is a real-time protocol in software control portion. The development environment of the paper that used the Target board and a Linux PC for connection used the RS-232C, USB connection, Ethernet LAN. The VoIP the environment for a communication used the wave file in the substitution which changes analog signal with the digital signal. And For the communication of the both sides it used the socket. This paper explained the fact that against a general technique from the operation of VoIP system. Using the Embedded linux development board which explained an operational process of the RTP protocol.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.44 no.3
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• pp.45-50
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• 2007

We present a auto compensating quantum key distribution system based on optical fiber at 1550nm. In the quantum key transmission system, main control board and phase modulation driving board are fabricated for auto controlling quantum key distribution(QKD). We tested the single photon counts per dark counts for a single photon detector, quantum key distribution rate($R_{sift}$) and the quantum bit error rate (QBER). Quantum bit error rate of 3.5% in 25km QKD is obtained. This system is commercially available.

• The Journal of the Korea institute of electronic communication sciences
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• v.3 no.1
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• pp.26-30
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• 2008

It is important matter that inflect well allocated frequency resource in cellular network and is still more serious element in environment that provide multimedia services. This paper describes model and algorithm that increase two elements that is frequency allocation and job scheduling that consider multimedia service traffic special quality by emphasis that do mapping present in CDMA cellular system. We proposed the model cpomposed three parts (channel allocation algorithm, mapping algorithm using genetic algorithm and scheduling algorithm) and simulation results.

• Journal of the Korean Institute of Intelligent Systems
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• v.16 no.5
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• pp.575-580
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• 2006

It is important matter that inflect well allocated frequency resource in cellular network and is still more serious element in environment that provide multimedia services. This paper describes model and algorithm that increase two elements that is frequency allocation and job scheduling that consider multimedia service traffic special quality by emphasis that do mapping present in CDMA cellular system. We proposed the model composed three parts (channel allocation algorithm, mapping algorithm and scheduling algorithm) and simulation results.