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- 저자 : Cho Sok-Pal (검색결과 12 건)
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문서 영상 전송에 있어서의 효과적인 오류 정정방법에 관한 연구
조석팔 聖潔大學校 情報産業技術硏究所 1997 情報産業技術論叢 Vol.2 No.-
The document image quality depends on transmission characteristics. The Error Correction Mode to be used to normal error correction, in the improvement of document image quality which was damaged by electrically poor line characteristics and noise, is powerful to the single error pattern but weak to burst error pattern. Here Forward Error Correction, that is very strong to random error pattern, is applied to burst error with converting it into random pattern to improve the document image quality. This suggest the possibility of error correction to the burst error pattern and the confirmation of the error fixing process thru experiment.
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A study on the quality of bi-level image data transmisson
조석팔 聖潔大學校 自然科學硏究所 1996 自然科學硏究 Vol.1 No.-
Bi-level Image Quality측정을 위해 ITU-TS표준 시험도표를 실제 선로에서 전송한후 설문지를 통해 응답자의 Image Quality평가를 계량화하는 주관적인 평가인 MOS방법이용. logit모형을 이용하여 Image quality에 영향을 미친다고 고려된 link수에 따른 통화량의 효과를 검정하였고 누적% 곡선을 이용하여 Image Quality를 추정하는 분석방법제시. Two statistical approaches are proposed to test effects on the image quality of document bi-level image data transmission which would be evaluated by subjective opinion scores, and to derive percentage curves of cumulative subjects at an mean opinion score value for estimating the image quality. a ITU-TS test chart NO.2 has been transmitted among some selected site and evaluated by users. The effects of the number of links and transmission time zone that is split into a busy/non-busy periods are tested by using a modified logit model. and there is no significant difference in the image quality. The score histogram that can be formed from sample is represented by a normal density curve. The method of deriving percentage curves of cumulative as a function of the mean of the normal curve is developed to estimate the quality of document bi-level image data transmission "fair, good or excellent".
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조석팔 聖潔大學校 情報産業技術硏究所 1999 情報産業技術論叢 Vol.4 No.-
This paper reviews the spreading techniques of use in direct sequence Code Division Multiple Access cellular networks, and the theoretical background for sequences used in Code Division Multiple Access and wideband Code Division Multiple Access, and the main characteristics of the Maximal length, Gold sequences, as well as variable-and fixed-length orthogonal codes. This paper suggests a resonable method of multiple spreading for channelization and scrambling in Code Division Multiple Access and W-Code Division Multiple Access realizations.
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비동기 전송모드 다중화기의 효과적인 통신정보량 제어에 관한 연구
조석팔 聖潔大學校 情報産業技術硏究所 1998 情報産業技術論叢 Vol.3 No.-
The transmission services satisfying characteristics of each traffic should be supported in the data communication networks. Existing packet multiplexing technique was difficult to serve real-time service due to delay. But Asynchronous Transfer Mode using cell can provide high-speed cell transmission and flexible bandwidth allocations. This paper propose the scheme and the management algorithm of the cell-based multiplexer The proposed multiplexer model is composed of two buffers which can store cells with two characteristics that is, delay sensitivity and loss sensitivity. Also threshold is set to protect high priority cell in each buffer and when the input traffics are unbalanced, variable service time period is operated to satisfy the characteristics of each input traffics. We analyze the performance of the proposed multiplexer model using queueing theory and present transmission parameters which satisfy high quality of services.
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조석팔,Cho, Sok-Pal 한국정보기술전략혁신학회 2009 情報學硏究 Vol.12 No.1
Telecommunications infrastructure based on circuit switch network is rswidly migrating to "all IP" network. However migration to IP has betw slower thaw in mawy other ve "icals because the potis ial risks and adve se impact of se vice impedi is s that may result from a migration ofttw outweigh the btwefi s of IP network. IP Telephony network has several strattgy for the replace is rof the existing Privatto nranch Exchangt, the construction of new IP networks cswible of suwoo "ing multiple communication se vices and applications, includirattgytelephony and the t ofgration of the remainiratexisting Privatto nranch Exchangts t oo new IP tfor the repfrastructure. ThTele "icle suggts s the IP tfor the network infrastructure for migration.
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조석팔,Cho Sok-Pal 한국정보기술전략혁신학회 2002 情報學硏究 Vol.5 No.4
This paper suggests the IP mobility which is independent with Mobile Terminal. A similar architecture had been ever proposed at other study group like IETF. Here, it applies IP mobility in accordance with macromobility procedure so that the terminals with legacy IP stacks have the same degree of mobility as a terminals with mobility aware IP stacks. This suggests the terminal mobility with using context transfer mechanism in discussion at the IETF and a new architecture for terminal mobility in wireless access networks.
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조석팔,Cho, Sok-Pal 한국정보기술전략혁신학회 2004 情報學硏究 Vol.7 No.3
본 논문은 다중 전송 비-블록킹 다단계 네트워크구성에 관한 방안을 검토하고 네트워크 확장으로 인하여 발생되는 문제점을 도출하여 바람직한 방안을 제시하고자 한다. 다단계 네트워크 노드의 확장은 단계가 증가할수록 그 교차점은 지수함수 적으로 증가한다. 따라서 이에 따른 비용대비 최적값을 찾아 다중 전송에 적용하고 접속 알고리즘의 속도개선에 대한 개선안을 마련코자 한다. 특별히 다단계 네트워크의 반복적인 확장에 초점을 맞추어 최신 정보에 대한 검토 및 몇 가지의 주제를 단순화하고 명확화 하는 것에 연구의 초점을 맞추었다.
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EDS(Event Driven Service) 시스템 구조에 관한 연구
송광빈,조석팔,Song, Kwang-Bin,Cho, Sok-Pal 한국정보기술전략혁신학회 2007 情報學硏究 Vol.10 No.4
EDS is a typical convergence service performing convergence between functions owned by multiple SPs. EDS provides users with the relevant information and the communication by the various personal conditional environment. An alternative terminology for events for net- work related applications is 'triggers'-these are assumed to be included in the present description. Events could be defined as any activities which occur within a service avail ability, signals. Events can be managed, for example, as part of a context-aware application. EDS carry out a procedure for processing user's requested information about mobil network-based entities, such as the combination with various applications, such as a LBS (Location Based Service) and area information. In AS (Application Service) network environments, the user has his customized EDS in the network, the EDS automatically connects the appropriate Terminals consistent with a user profile. EDS can also send the collected information to other requesting users by way of event information and using the procedures of combination with other services. The user can record/retrieve the user-related information to from the information base through EDS.
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