지역 전자 산업발전 패러다임

박광채 대한전자공학회 1996 대한전자공학회 심포지엄 논문집 Vol.- No.-

FSK MODEM System의 構成에 관한 硏究

朴光埰 朝鮮大學校 動力資源硏究所 1981 動力資源硏究所誌 Vol.3 No.1

In this paper, MODEM theory is analyed and the composition of 600-1,800 bps FSK MODEM is also studied. Especially, for the purpose of home production it is designed and made by using homemade semiconductor elements and OP amplifiers easily obtainable. It is shown that this system is able to be interface with the existing products, and that the bit error rate is able to be approximate to theoretic maximum value.

EB, ZCR, LE에 의한 우리말 音聲認識

朴光埰 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.1

In this paper, speech recognition system was designed and manufactured. 12 seperated words had been experimented. The characteristics methods from which voice signal was derived was zero-cross-rate, filter-bank and Log-energy. As these parts were dealt with by hardware, the recognition time could be shortened. The data from which were derived by three kinds of means were devided into three groups and were stored in memory. The data of the first group and the second one were matched standard pattern by means of DP. When the first result was the same as second one, the data of the third group did not have to be matched standard pattern and the result could be output. The results was that the recognition time could be shortened and the recognition of 93% could be obtained.

종합서어비스를 위한 토큰링 LAN의 구성

박광채 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.1

A New intergrated services token-controlled ring is proposed. This ring has the following distinct features. 1) It allows synchronous traffic such as voice and video to have a definite access to the channel Within each packetizatlon period(or frame). Hence, the tranceiving unit needs only one transmit and one receive buffer for each synchronous stream. 2) It allows data messages to have a higher channel access priority provided that the syncronous traffic is not delayed by more than one frame, Urgent messages can therfore be transmitted with a minimum delay, 3) It supports variable rate data circuits, Simulation results show that the message delay is much smaller than other integrated services schemes and the voice packet loss probability is essentially zero over a wide range of data and voice traffic loads.

Computerized traffic signal control system의 구성에 관한 연구 : 광주시 가로를 중심으로 Intersection in Gwang-Ju area

박광채 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.1

本 論文에서는 광주시 街路를 중심으로 교통량을 調査하고, 이 조사자료를 토대로 교통소통의 원화를 위해 computerized traffic signal control system의 구성을 實現하였다. 이 결과 교통소통의 圓滑化는 물론 時間과 에너지의 節約, 대기오염이나 교통 사고율의 현저한 감소율을 가져올 수 있다. In this paper, this traffic volume was investigated in connection with the street in Gwang-Ju city, which had realized the constitution of computerized traffic signal control system for the traffic harmonization. The results can get the time and energy economy and considerable decrease of the air pollution and the traffic accident rate as well as traffic harmonization of Gwang-ju city.

Z-80ASIO를 利用한 PC用 LAN IU 設計

朴光埰 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.1

The LAN IU was designed for personal computer employing the token ring. The physical layer is constituted of Z-80 SIO and RS 422A, data link layer is implimented with Z-80A SIO and DMA. The rate of block error was obtained 0.006% with the result of simulating the modified loop LAN system, using the LAN IU at the speed of 800kbps. The result proves that each of station PC can be used as not only an independent system but also a terminal.

무선 센서 네트워크에서의 동적 그룹화 메커니즘

박광채(Park, Kwang-Che),김현열(Kim, Hyon-Yul),배철수(Bae, Cheol-Soo) 한국정보전자통신기술학회 2013 한국정보전자통신기술학회논문지 Vol.6 No.4

최근 센서의 응용 분야가 다양해지면서, 센서 네트워크의 신뢰성에 관한 관심이 증대되어왔다. 본 논문에서는 송신 센서노드로부터 싱크노드까지의 데이터 전송에 있어 신뢰성을 보장하며 에너지 효율을 극대화하는 방법을 제안한다. 제안 기법은 전송 경로에 있는 노드들을 임시적으로 그룹화 하여 그룹 내에서는 end-to-end ACK 시스템을 사용하고, 그룹 간 통신에는 Hop-by-Hop ACK 시스템을 사용한다. 제안된 기법은 기존에 제안된 다양한 라우팅을 기법들에 추가적으로 적용 할 수 있는 방법으로, 네트워크 수명을 연장시키며 신뢰성을 보장한다. In recent years, many applications in WSN have increasingly interested in data transfer reliability. In this paper, we propose a dynamic grouping transfer mechanism which maintains both reliability and energy efficiency in transmission from a source to a sink. The proposed scheme considers channel error of each node. Then it uses an end-to-end ACK transmission in a group and a hop-by-hop ACK transmission between groups. Consequently this mechanism minimize the cost of packet transfer along with enhancing the network lifetime and reliability.

Ad-hoc 네트워크에서 지연 ACK를 이용한 TCP성능 향상에 관한 연구

박광채,나동건,Park Kwang-Chae,Na Dong-Geon 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.9

Ad-hoc 네트워크는 무선 링크들로 구성 된 멀티-홉 네트워크이다. 그리고 무선 링크의 전송 특성은 유선에 비해 보다 불안정 한 상태이다. 그러므로 Ad-hoc 네트워크에서는 패킷 손실이 자주 발생하고, 패킷 손실에 의한 TCP 연결 실패는 TCP 성능을 심각하게 저하시킨다. 또한, TCP 성능저하는 무선채널에서 데이터 패킷과 ACK 패킷의 충돌에 의해서 발생한다. 본 논문에서는 ODA(Ordering-Delayed ACK)지연 알고리즘을 제안하고, ODA 알고리즘과 지연 ACK 알고리즘을 이용하여 무선 Ad-hoc 네트워크의 성능을 향상시키고자 한다. 제안된 ODA알고리즘은 무선 Ad-hoc 네트워크에서의 수신 측에서 데이터 패킷의 수를 순서 적으로 증가시킨다. 본 논문에서는 NS-2를 이용하여 컴퓨터시뮬레이션을 수행하였다. 시뮬레이션 결과, 제안된 ODA 알고리즘은 기존의 지연 ACK 알고리즘에 비해서 무선 멀티-홉 Ad-hoc 네트워크 환경에서 채널 용량이 증가되고 네트워크의 성능이 향상됨을 확인할 수 있었다. An ad hoc network is multi-hop network composed of radio links. and the transmission quality of a radio link is more unstable than that of a wired circuit. Packet loss thus occurs frequently in an ad hoc network, and the consequent connection failure results in a severe deterioration of TCP performance. TCP performance also deteriorates because of the collision of data packets and ACK packets in the radio channel. In this paper we study to improve the performance of the Mobile Ad-hoc network by using Delayed ACK algorithm with our proposed ODA(Ordering-Delayed ACK) method. The proposed ODA algorithm increases the number of the data packets orderly at the receiver side which is going to be applied for the Mobile Ad-hoc network. We accomplished a computer simulation using NS-2. From the simulation results, we find the proposed ODA algorithm obviously enlarge the channel capacity and improve the network performance at the situation of multi-hop of ad-hoc network than the existing Delayed ACK algorithm.

무선통신에서 대칭링크 네트워크를 이용한 트래픽 흐름제어 채널분석

박광채,Park, Kwang-Chae 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.9

본 논문은 무선통신 트래픽제어에서 데이터의 흐름을 원활하게 유지 향상시키기 위한 연구이다. 통상적인 TCP 윈도우 흐름제어에서 나타났던 다양한 유형의 버스트현상은 양방향 트래픽제어를 통해 제거하거나 완화시킬 수 있다. 현재는 대기열이 주로 최종 시스템에 위치함으로 인해 무선통신 제어채널을 운영하는 동안에 TCP ACK 압축문제가 발생한다. 그러므로 소스 IP 대기열의 주기적인 버스트 특성을 분석함으로써 대기열의 최대값을 예측하여 적용한다. 이와 같은 예측수단을 무선통신 트래픽제어에 적용하여 대칭트래픽을 제어함으로써 처리율이 현저하게 증가되어 성능이 향상됨을 분석한다. This paper is about the research to maintain and enhance the flow of data of the wireless traffic control. Various types of burst traffic that were found at TCP window flow control have been removed or mitigated using the two-way traffic control. Currently, TCP ACK Compression problem appears during the transmission of the wireless communication control channel because the queues are mostly located at the end system. Therefore, in this paper, the periodic bursty characterist of the source IP queue wilt be analyzed to predict the maximum value of queues. And then the prediction tool will be applied to wireless communication traffic control to handle symmetric traffic as to increase the throughput and improve the performance.

B-ISDN과 LAN/MAN의 연동에 관한 연구

박광채,이혁진,서순석 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.2

One of the challenges in the interconnection of LAN and MAN to ATM is the support of connectionless traffic in the ATM network. A commonly proposed strategy consists of maintaining a low bandwidth VP(virtual path) between each pair of gateway and of requesting more bandwidth whenever a burst comes in from the LAN or MAN. Unfortunately this stratege places a heavy burden on the ATM control processor. Therefore we proposed BA(Bandwidth Advertising) scheme, which know available bandwidth and On-the-fly transmission, which transfer bursts without prior bandwidth reservation. The BA scheme and On-the-fly transmission for connectionless traffic is described and is compared with a bandwidth renegotiation strategy.