• Title/Summary/Keyword: VCR

Search Result 188, Processing Time 0.07 seconds

Study on the Digital VCR System and Its Image Enhancement Techniques (디지털 VCR의 영상압축 기술 및 그의 화질 개선에 관한 연구)

  • 이형호;백준기
    • Journal of Broadcast Engineering
    • /
    • v.1 no.2
    • /
    • pp.142-151
    • /
    • 1996
  • The digital video cassette recorder(DVCR) is considered as next generation VCR due to its performance breakthrough in various aspects, such as digital recording and various digital image processing techniques. The purpose of our study is to understand the standardized specifications of the DVCR system, evaluate the performance of the system, and improve the quality of the reconstructed DVCR image. More specifically, in order to enhance the DVCR Image we consider a series of discrete cosine transform(DCT), quantization, inverse DCT, and Inverse quantization as a degradation process of the Imaging system, and propose a fast adaptive image restoration algorithm for reducing blocking artifacts.

  • PDF

Supporting VCR Operation in Patching (패칭에서의 VCR 지원 방법)

  • 조창식;마평수;강지훈
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2001.10c
    • /
    • pp.184-186
    • /
    • 2001
  • VOD 서비스에서 멀티캐스팅 기법을 적용하여 여러 클라이언트가 동일한 스트림을 공유함으로써 네트워크 대역폭을 절약하려는 연구가 활발하다. 패칭 방법은 기존에 전송되고 있는 멀티캐스팅 스트림을 공유하여 디스크에 임시로 저장하고, 별도의 채널을 생성하여 공유가 불가능한 초기 데이타 스트림을 수신하여 재생한다. 초기 데이타에 대한 재생이 끝나게 되면, 디스크에 저장된 데이타에 대한 재생을 수행한다. 패칭 방식은 네트워크 대역폭을 절약할 수 있는 효과와 더불어 클라이언트의 초기 대기시간을 최소화하여 True VOD를 지원한다. 본 논문에서는 패칭 방식의 VOD 시스템에서 VCR 연산 지원 방식을 제시한다. 멀티캐스팅 환경에서의 VCR 연산은 멀티캐스트 채널에 대한 관리와 개별 클라이언트에 대한 세션 정보의 효율적인 관리를 전제로 하고 있다. 지원하는 종류로는 점프(임의위치 재생), 일시정지 및 일시정지 재개, 종료가 있다.

  • PDF

Design of fuzzy speed/phase controller for drum motor in home VCR (VCR용 드럼 모터의 퍼지 속도/위상 제어기 설계)

  • 박귀태;이기상;박태홍;배상욱;이상락
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1991.10a
    • /
    • pp.457-462
    • /
    • 1991
  • Recently, digital techniques have been applied to servo systems of the home VCR, which result in high accuracy, high stability and a small number of parts required. The servo systems are now becoming more compex because the latest home VCRs are stringly required to have many functions. Given these circumstances, software servo concepts were introduced to the VCR servo system with microprocessor. But there are some difficulties in the conventional digital PID controller, eg. caculating the exact gains or dynamics. In this paper, we introduce FLC(Fuzzy Logic Controller) to the speed/phase control for VCR drum motor. To show the usefulness of the proposed controller, some studies are discussed by simulation and experiment.

  • PDF

An Image Data Compression Algorithm for a Home-Use Digital VCR Using SBC with Block-Adaptive Quantization (SBC와 블럭 적응 양자화를 이용한 가정용 디지탈 VCR 영상 압축 알고리듬)

  • 김주희;서정태;박용철;이제형;윤대희
    • Journal of the Korean Institute of Telematics and Electronics B
    • /
    • v.31B no.9
    • /
    • pp.124-132
    • /
    • 1994
  • An image data compression method for a digital VCR must satisfy special requirements such as high speed playback. various edting capabilities and error concealment to provide immunity to tape dropouts. Taking these requirements requirements into consideration, this paper proposes a new interframe subband coding algorithm for a digital VCR. In the proposed method, continuous input images are fist partitioned into four frequency bands. The lowest frequency subband is coded with 3-D block adaptive quantization that removes the level redundancy within each level. The other higher frequency subbands are coded by an intraframe coding method using the property of the human visual system. To keep reasonable image quality in high speed palyback, a segment forming method in the frequency domaing is also proposed Computer simulation results demonstrate that the proposed algorithm has the potential of achieving virtually lossless compression in normal play and produces an image with less mosaic errors in high speed play.

  • PDF

Ultra-precision Positioning By Using Coherence of White Light (백색광의 제한 간섭성을 이용한 초정밀 위치결정)

  • Park, Hyun-Goo;Kang, Min-Gu;Kim, Seung-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.21 no.6
    • /
    • pp.995-1001
    • /
    • 1997
  • In this paper, a new positioning method with incoherence of white light is described and practically implemented to attach VCR heads on a drum very accurately. This method utilizes the Michelson Interferometer which uses white light with short coherence length as the light source to generate interference fringes only in case the optical path difference is shorter than about 2.mu.m. The course position of VCR heads and the fine are determined by appearance and visibility of interference fringes, respectively. The appearance are detected by an image processing technique using FFT(Fast Fourier Transform).

Visual Commonsense Reasoning with Knowledge Graph (지식 그래프를 이용한 영상 기반 상식 추론)

  • Lee, Jae-Yun;Kim, In-Cheol
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2019.10a
    • /
    • pp.994-997
    • /
    • 2019
  • 영상 기반 상식 추론(VCR) 문제는 기존의 영상 기반 질문-응답(VQA) 문제들과는 달리, 영상에 포함된 사물들 간의 관계 파악과 답변 근거 제시 등 별도의 상식 추론이 요구되는 새로운 지능 문제이다. 본 논문에서는 입력 데이터(영상, 자연어 질문, 응답 리스트)에서 사물들 간의 관계와 맥락 정보를 추출해내는 모듈들 외에, 별도로 ConceptNet과 같은 외부 지식 베이스로부터 관련 상식들을 직접 가져다 GCN 기반의 지식 그래프 임베딩 과정을 거쳐 추가적으로 활용할 수 있는 모듈들을 포함한 새로운 심층 신경망 모델인 KG_VCR을 제안한다. 제안 모델인 KG_VCR의 세부 설계사항들을 소개하고, VCR 벤치마크 데이터 집합을 이용한 다양한 실험들을 통해 제안 모델의 성능을 입증한다.

Ultrafiltration of Soybean Cooking Water for the Production of Soy-oligosaccharides (대두올리고당 생산을 위한 대두침출액의 한외여과)

  • Mok, Chul-Kyoon;Ku, Kyung-Hyung;Park, Dong-June;Kim, Nam-Soo;Sohn, Heon-Soo
    • Korean Journal of Food Science and Technology
    • /
    • v.27 no.2
    • /
    • pp.181-184
    • /
    • 1995
  • Ultrafiltration was applied for the production of soy-oligosaccharides from bean cooking water(BCW), a by-product recovered in soymilk processing. The ultrafiltration of BCW on a membrane of 20,000 cutoff molecular weight recovered most oligosaccharides as permeate with concomitant removal of protein at 40% when volume concentration ratio(VCR) exceeded 5.0. When the VCR exceeded 5.0, membrane rejection value(MRV) for protein started to increase slowly while the MRV for sugar showed a sharp increasing trend showing 6.57% at VCR 5.0 and 19.96% at VCR 10. The optimum VCR based upon the MRV's was 5.0. Maximum recovery of soy-oligosaccharides was, however, obtained at VCR 10.0.

  • PDF

A Study on Development of Energy Education Materials for Middle School Students (중학교용 에너지 교육 자료 개발 연구)

  • 최돈형;이양락
    • Hwankyungkyoyuk
    • /
    • v.7 no.1
    • /
    • pp.46-87
    • /
    • 1994
  • Our country has been consuming a huge amount of energy in the course of industrialization and its demand is expected to increase enormously in the future. However, the deposits of energy resources are so limited that the settlement of energy problem comes up the essential subject. To solve the energy problem, it is requested that new resources to gain energy stably should be developed and also energy should be economized and used effectively. The effective use of energy and an the wisdom of economy in energy are requested to everybody and these things should be habitualized from very young age through education. Nevertheless, almost every school in our country hasn’t been concerned about energy education. Even though they have a concern, they are very short of the energy education materials and the quality of the materials is not so good. Therefore it is very meaningful to the settlement of energy problem of the country to make the students who will lead our country to make the students who will lead our country in the future realize the seriousness of energy problem and to provide them the necessary knowledge and methods to solve this problem so that they practice those things in everyday life. Having these necessities, this research, supported by The Korea Energy Management Corporation(KEMCO), was performed for 8 months from April 17, 1994 to December 17, 1994. Many peoples participated in this study such as 30 staffs of researchers and authors, 5 staffs of photographers and illustrators, and 3 VCR program producers developing an energy education material set for middle school students that includes a printed material for student, a diskette for computer simulation, a teacher's guidebook, VCR material and its guidebook. The following main development direction was established : First, the material for student should be consisted of units that let students know the seriousness of energy problem. Second, the focus should be put on the necessary method and practice to economize energy actually in real life based on the basic knowledge learned in elementary school. Third, material for student should be consisted of modules to be student activity-oriented teaching-learning rather than lecture-oriented one. The activity, to maximize student's interests, should be presented in various forms such as experiments, investigation, play, data interpretation, computer simulation, visits, expression and appreciation, etc. To develop the energy education materials for middle school students, a research plan was made first. After literature review about domestic and foreign energy education materials, several research trips home and abroad, and discussion meetings, the basic theory of energy education such as the principle, objective, contents, teaching-learning method, and evaluation method was established. Material for student was developed through the following procedures : The activities in the existing energy education materials were analysed and were divided into four categories related to energy using places of home, school, community, and country, and which were again divided into three categories related to time of past, present, and future, Considering these division, nine modules which are structure units of material for student were chosen, Each module comprises 2-4 activities. Totally 31 activities were designed in this way. The syllabi were made out for each activity and writing was asked for to experts related to each activity after several discussions and revision. To complement the draft, another several discussions and revision were also made on it and then pictures and illustrations were asked for. All these procedures complete the material for student, titled ; Energy Inquiry of Middle School Students', which totals 129 pages and is all in color. As the manuscript of material for student was fixed, writing for teacher's guidebook was asked for to the same writers. The draft of teacher's guidebook was also complemented through the several concentrated works and discussions. Teacher's guidebook focused on the teaching-learning principle and methods of energy education and on the concrete instruction cases for effective instruction of material for student. It is organized with two parts : the one is 'general outline' which introduces theoretical contents and the other is 'details' which are practically helpful to teaching-learning. It is totally 131 pages including both 'general outline' and 'details'. The VCR material and its guidebook consist of contents that cultivate the good attitude trying to economize energy and raise student's interests with a purpose of strong motivation to recognize the necessity of economy and practice it. After establishing development direction of VCR material through discussion meetings and research trips, its script was made by relevant experts. Then the script was also reviewed two times. The drafted VCR material made by a video material developing expert was examined and modified by previews twice. After completion of VCR material, the VCR guidebook was made. All these procedures led to the development of VCR material which runs 20 minutes in VHS type. The VCR guidebook shows a production purpose of the program, structure of contents, evaluation methods, and contents of the program in detail to give help to instructors when they use this VCR material, When these energy education materials are used, it is desirable that the VCR material should be presented first to induce student's motive, and then material for student is introduced Since the material for student is composed of activity-oriented modules and each module is independent one another in general, and each activity is, too. the necessary module or activity can be chosen and utilized in any order according to school or class conditions. This energy education materials will contribute to the development of student's ability to solve energy problem in everyday life and teacher's ability to teach the fundamental knowledge and method in solving energy problem.

  • PDF

Accelerated Testing of Coated VCR Drum Under Various Environmental Conditions (환경변화에 따른 VCR 코팅드럼의 가속실험)

  • Park, U-Hyeon;Hwang, Dong-Hwan;Kim, Dae-Eun;Lee, Sang-Jo;Yoo, Dae-Eun;Kim, Geum-Mo;Choi, Gye-Cheol
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.20 no.10
    • /
    • pp.3095-3104
    • /
    • 1996
  • The tribological characteristics of TIN and DLC coated VCR drums were compared to conventional aluminum drums using a custom built accelerated testing set-up under varying temperature and humidity. It is found that the coated drums exhibit superior frictional properties at elevated temperature and high humidity compared to bare aluminum drum. Futhermore, the coated drums maintained their initial surface conditions over a wider range of temperature and humidity variation. As for the damage incurred to the tape, DLC coated drum was the most favorable of the three types of drums.

An experimental investigation of thermodynamic performance of R-22 alternative blends (R-22 대체용 혼합냉매의 열역학적 성능에 대한 실험연구)

  • Hwang, E.P.;Kim, C.N.;Park, Y.M.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.9 no.1
    • /
    • pp.82-91
    • /
    • 1997
  • R-410a and R-407c witch have the best potential among the substances being considered as R-22 alternatives were tested as "drop in" refrigerants against a set R-22 baseline tests for comparison. The performance evaluations were carried out in a psychrometric calorimeter test facility using the residential split-type air conditioner under the ARI rating conditions. Other than the use of different lubricant and a hand-operated expansion valve, one of the commercial systems was selected for the experiment. Performance characteristics were measured; compressor power, capacity, VCR, mass flow rate and COP. The tests showed that R-407c can be directly applied to the existing refrigeration system because of its similar vapor pressure and other thermopysical properties with those of R-22. However, it required change to the volume flow rate of compressor in order to achieve the similar performance with R-22 because of its relatively small VCR and capacity. Meanwhile, R-410a has too high a vapor pressure to be applied to the existing system and this feature results in relatively low COP of the system compared to that of R-22. But this could be improved by changing compressor design considering R-410a's relatively high VCR and capacity compared to those of R-22.

  • PDF