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전용희,이상학,Jeon, Yong-Hee,Lee, Sang-Hag 한국정보처리학회 2000 정보처리논문지 Vol.7 No.11
일반적으로 주문형 비디오 시스템(Video-On-Demand)에서는 계산 능력보다는 I/O 기능 및 저장 요구사항이 더 중요하다. CPU 기술의 발달로 프로세서의 성능과 디스크 속도 사이의 차이는 점차로 넓어지고 있는 실정이다. 그러AM로, 디스크 시스템이 VOD 시스템에서 대표적으로 병목 현상을 초래하게 된다. 이러한 물리적인 제한을 완화하기 위하여 디스크 배열 시스템이 사용된다. 디스크 배열 시스템의 I/O 성능은 프로세서의 능력, I/O 스케줄링 정책, 배열에 사용되는 구성 디스크의 수, 디스크 블록 크기, 블록 배열 정책 등에 의하여 개선될 수 있다. 본 논문에서 고려된 디스크 스케줄링 기법들로는 EDF(Earliest Deadline First), SCAN, SCAN-EDF, Round-robin, GSS(Grouped Sweeping Scheme) 및 SCAN의 변형된 형태인 C-SCAN, LOOK, C-LOOK 등이 있다. 이러한 디스크 스케줄링 기법들을 중심으로 모의실험을 수행하고 파리미터들이 성능에 미치는 영향을 분석하였다. In a VOD(Video-On-Demand) system, I/O performance and storage requirements are generally more important than computing capability, Due to the development of CPU tecnology, the gap between the performance of processors and desk speed are widening. Therefore, the disk system typically becomes the bohleneck ina VOD system. In order to allevte those effects from physical constramts, disk array system is used. The I/O performance of disk arrays can be improved by the capability of processors, I/O schefuling polcy, the number of member disks in the array, disk block size, block placemet method etc. In this paper, we considered the disk scheduling schemes including EDF( Earliest Deadine First), SCAN, SGAN-EDF, Round-robm. GSS(Grouped Sweeping scheme), and C-SCAN, LOOK, C-LOOK which are variations of SCAN Mamly focusing on those disk scheduling schemes, we performed the simulation in order to compare and eview the perionmance of disk arrays considening seveial related parameters under diverse environments and analyzed the effects of those parameters to the performance.
非同期 傳達모드 通信網을 위한 影像 트래픽의 特性化에 대한 硏究
全龍熙,朴貞淑,朴銀美 대구효성가톨릭대학교 응용과학연구소 1995 응용과학연구논문집 Vol.4 No.-
Asynchronous Transfer Mode(ATM) has been proposed as the target switching and multi-plexing schemes for broadband ISDN(B-ISDN). A variety of traffic types such as voice, data and video can be integrated into the network. Among the traffic types, video requires a significantly higher bandwidth than voice and data. Since video will be a major traffic component in the future multimedia communiation, transporting video traffic in a very efficient manner will be the key point for the successful implementation of B-ISDN. Therefore, the characterization of video traffic sources are essential for the design of traffic control algorithms in ATM networks. The knowledge of bit rate statistics are necessary for the proper bandwidth allocation algorithms in the ATM networks. Since VBR(Variable Bit Rate) video transmission can be achieved taking advantages of the inherent burstiness of video sources, VBR encoding algorithms are well suited for the ATM networks. VBR video transmission also provides uniform quality video by transmitting at a higher rate during high-activity scenes and at a low rate when there is less motion. As the bit rate is not a constant, it is necessary to develop some statistical models in order to represent cell arrivals from video sources. The bit rate generated by a VBR coder depends on the type of video scenes, video coding algorithms, and video quality requirements. A video source model should have simple and effective parameters for performance evaluation and traffic control of ATM networks. In this paper, some video models are surveyed and reviewed. A video model was chosen and simulated. The simulation results are shown in order to illustrate some generated bit pattern of video sequence. Some of the results found may also be used for the design of efficient traffic control algorithm in ATM networks.
의학 영상 저장 전송 시스템에 대한 연구 : 요구사항 및 사례연구를 중심으로 Requirements and Case Studies
이상학,전용희 대구효성가톨릭대학교 1998 연구논문집 Vol.57 No.2
The concept of Picture Archiving and Communication System(PACS) was originatted in radiology. The PACS is a medical imaging storage and dilivery system. The goal of PACS is to develop computer hardware and software which would enable electronic access, storage, transmission, and display of patient data and images. Installation of PACS in an existing hospital involves many technical and budget problems. Therefore, we need to study technical requirements which are necessary to implement PACS. According to the development of both computer and communication technologies, the introduction of PACS in domestic hospitals is becoming a reality and even appears as a vital component for the hospital information system. Therefore, the discussion and consideration on PACS before the installation inan existing hospital will be a real matter in the near future. Accordingly, we have defined general technical requirements for PACS in terms of hardware components required, imaging acquisition, media storage, compression/decompression, user interface, communication networks etc. Recent technology trends and case studies are also included. This basic study will be used for further study of PACS especially in terms of technical requirements for multimedia medical imaging storage, retrieval, and transmission on ATM networks.
전용희,전향희 대구효성가톨릭대학교 응용과학연구소 1999 응용과학연구논문집 Vol.7 No.-
우리는 우리 지방에 자생하면서 기후풍토에 적응된 아름답고 진귀한 많은 야생 화목류와 교목류 등을 부존하고 있으면서도 이들을 연구 개발하지 않고 주로 도입 종과 재배종에만 의존하고 있는 것이 오늘의 현실이다. 그러므로, 국내외의 관광객 이 요구하는 즉, 강원도는 물론 우리나라 고유의 정취와 이미지를 줄 수 있는 많은 야생종들을 연구, 개발하여 조경식물화시켜 대량으로 번식시키는 동시에 일반 재배 화 함으러써 향토색 짙은 관광한국을 만들어 관장사업의 근본목표인 경제적 효용을 다하기 위해 매우 개발가치가 있는 교목류 37종과 관목류 73종의 특성을 전년도에 조사하였고, 이번에는 이들 중 만병초, 개느삼, 다래, 딱총나무, 꼬리진달래, 가침박 달, 흰진달래, 으름 등 8종의 특성, 자생지 환경, 번식실험, 재배 및 이용실험 등을 실시하였다. In order to efficiently provide multimedia services in Broadband Integrated Services Digital Network(B-ISDN), the control of several complicated types of call and service is inevitable. These control may be accomplished efficiently using Intelligent Network(IN). The integration of IN and B-ISDN is an important technology field for the emerging multimedia services in the future. To incorporate diverse multimedia services over the high-speed communication network based on the B-ISDN, the IN-based service control architecture is being considered as the most realistic choice. In the IN, all services and service features are described based on basic call process(BCP). The BCP may be classified into several models depending on the degrees of detailed descriptions but it can be categorized broadly into two classes; distributed and centralized types. In this paper, we studied the both call modeling techniques for IN over B-ISDN which is one of the issues to be solved to make up IN Capability Set-3.