• Journal of Broadcast Engineering
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• v.7 no.2
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• pp.79-87
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• 2002

The fast advances in digital video processing and multimedia processing technology over the last decade enabled various non-linear video browsing techniques. Based on the machine-understanding of the video content, non-linear video brows ing interfaces such as key-frame based content summarization have been introduced. The key-frame based user interfaces, such as storyboard or table of content, however, are still very hard for conventional TV users to use, and are very hard to implement without the service providers providing additional information for the construction of the key-frame based interfaces. In this paper, non-linear video browsing techniques, which not only overcome previously described drawbacks but also are easy-to-use, and real-time video indexing technology to support the proposed browsing techniques are proposed. The structure-based skipping and skimming help users easily find interesting scene and understand the content in a very short time, using real-time video indexing technology.

• Journal of Korea Multimedia Society
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• v.13 no.9
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• pp.1299-1313
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• 2010

Top-k queries return k objects that users most want in the database. The Partitioned-Layer Index (simply, the PL -index) is a representative method for processing the top-k queries efficiently. The PL-index partitions the database into a number of smaller databases, and then, for each partitioned database, constructs a list of sublayers over the partitioned database. Here, the $i^{th}$ sublayer in the partitioned database has the objects that can be the top-i object in the partitioned one. To retrieve top k results, the PL-index merges the sublayer lists depending on the user's query. The PL-index has the advantage of reading a very small number of objects from the database when processing the queries. However, since many random accesses occur in merging the sublayer lists, query performance of the PL-index is not good in environments like disk-based databases. In this paper, we propose the Abstracted Partitioned-Layer Index (simply, the APL-index) that significantly improves the query performance of the PL-index in disk-based environments by reducing the number of random accesses. First, by abstracting each sublayer of the PL -index into a virtual (point) object, we transform the lists of sublayers into those of virtual objects (ie., the APL-index). Then, we virtually process the given query by using the APL-index and, accordingly, predict sublayers that are to be read when actually processing the query. Next, we read the sublayers predicted from each sublayer list at a time. Accordingly, we reduce the number of random accesses that occur in the PL-index. Experimental results using synthetic and real data sets show that our APL-index proposed can significantly reduce the number of random accesses occurring in the PL-index.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.691-694
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• 2000

기존 LAN 환경에서 인터넷을 이용한 멀티미디어 실시간 전송과 같은 QoS 보장형 서비스에 대한 요구가 증대되면서, 고속의 ATM 기술을 LAN에 적용하는 기술들이 등장하였다. LANE(LAN Emulation)은 그러한 기술 대안들 중에서 campus network와 enterprise network에 많이 보급되고 있는 기술이다. 그러나 이러한 급격한 LANE 도입에 비하여 이의 효과적인 운용에 대한 연구는 많지 않은 실정이다. 본 논문에서는 LANE을 도입한 campus network의 최적 운영방안에 대하여 논한다. Broadcast 데이터 트래픽 관리에서 발생하는 규모성(Scalability) 문제로 인하여 전체 LANE망은 여러 개의 ELAN으로 나뉘어 관리된다. 이 때 하나의 ELAN은 마치 단위 LAN로써, Broadcast 데이터의 전송범위를 제한한다. 즉, 서로 다른 ELAN에 속하는 노드간에는 Broadcast 방식으로 데이터를 전송할 수 없게 된다. 그런데, IPX 등을 사용하는 대화형 시뮬레이션 게임 등과 같은 응용프로그램에서는 Broadcast 방식이 이용되므로, 서로 다른 ELAN에 속하는 노드간의 데이터 전송은 불가능하게 되거나 별도의 복잡한 과정을 개입시켜야 하는 비용이 발생한다. 따라서 규모성 문제해결을 위한 ELAN 구성(configuration)에는 위와 같은 비용이 수반된다. 본 연구에서는 LANE망을 여러 개의 ELAN으로 분할하는 경우에 블로킹(blocking) 되는 Broadcast 트래픽 규모를 해당 ELAN 구성의 비용으로 간주한다. 이 경우에 규모성을 고려한 ELAN의 최적 구현방안(optimal configuration)은 ELAN 구성을 위한 기술적 제약하에서 블로킹되는 Broadcast 트래픽을 최소화시키는 문제로 요약된다. 이는 다시 그래프 분할문제(graph partition problem)의 변형된 형태로 모형화 될 수 있다. 본 논문에서는 이러한 사항들을 고려하여 제시된 수리적 모형을 대상으로, genetic algorithm을 이용하여 최적 ELAN 구성을 위한 여러 파라미터들의 효과를 살펴보고, 이러한 결과들이 LANE 운영과 관련하여 가지는 함축적인 의미를 고찰한다.

• Journal of KIISE:Databases
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• v.31 no.2
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• pp.99-107
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• 2004

Education and training are expected to change dramatically due to the combined impact of the Internet, database, and multimedia technologies However, the distance learning is often impeded by the lack of effective tools and system to manage and retrieve the lecture contents effectively. This paper introduces a prototype system called COVA that enables remote users to access specific parts of interest by contents from a large lecture database. COVA includes several novel techniques to achieve the content-based lecture retrieval in distance teaming: (1) The XML-based semistructured model to represent lecture contents; (2) The technique to build structural summaries, i.e., schemas, of XML lecture databases; (3) Index structures to speed up the search to find appropriate lecture contents.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.950-953
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• 2006

A key issue toward mobile multimedia communications is to create technologies for broadband signal transmission that can support high quality services. Such a broadband mobile communications system should be able to overcome severe distortion caused by time-varying multi-path fading channel, while providing high spectral efficiency and low power consumption. For these reasons, an adaptive suboptimum decision feedback equalizer (DFE) for the single-carrier short-burst transmissions system is considered as one of the feasible solutions. For the performance improvement of the system with the short-burst format including the short training sequence, in this paper, the multiple-training least mean square (MTLMS) based DFE scheme with soft decision feedback is proposed and its performance is investigated in mobile wireless channels throughout computer simulation.

• TTA Journal
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• s.66
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• pp.48-65
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• 1999

본 고는 전기통신망에서 유연한 서비스 제공 구조인 지능망 기술의 표준화 동향을 분석한다. 먼저 지능망 기술 개념과 지능망 관련 국제/지역 표준화 관련 기관을 살펴보고, ITU-T SG11을 중심으로 한 지능망 국제 표준화 결과인 IN CS-1,2,3의 주요 내용을 요약 정리한다. 그리고 최근의 지능망 표준화의 주요 이슈인 지능망에서의 인터넷 지원을 위한 지능망-인터넷 연동 표준화 동향과 IMT-2000에서의 지능망 표준화 동향을 전망하기 위하여 현재 진행 중인 IN CS-4 표준화 동향을 분석한다. 향후 무선멀티미디어 서비스 제공 기반인 IMT-2000에서의 지능망 표준화 동향을 전망하기 위하여 유럽과 북미의 지역 표준화 기구에서 추진 중인 무선 지능망 기술 규격인 CAMEL과 WIN의 표준화 동향도 분석한다. 끝으로 국내 지능망 표준화 현황을 정리하고 향후 국제 표준화 추세 등을 고려한 국내 표준화 추진 전략을 제안해 본다.

• Journal of Korea Multimedia Society
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• v.20 no.8
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• pp.1258-1270
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• 2017

'Semantic gap' has been a year-old problem in automatic video summarization, which refers to the gap between semantics implied in video summarization algorithms and what people actually infer from watching videos. Using the external EEG bio-feedback obtained from video watchers as a solution of this semantic gap problem has several another issues: First, how to define and measure noises against ERP waveforms as signals. Second, whether individual differences among subjects in terms of noise and SNR for conventional ERP studies using still images captured from videos are the same with those differently conceptualized and measured from videos. Third, whether individual differences of subjects by noise and SNR levels help to detect topic-irrelevant shots as signals which are not matched with subject's own semantic topical expectations (mis-match negativity at around 400m after stimulus on-sets). The result of repeated measures ANOVA test clearly shows a 2-way interaction effect between topic-relevance and noise level, implying that subjects of low noise level for video watching session are sensitive to topic-irrelevant visual shots, while showing another 3-way interaction among topic-relevance, noise and SNR levels, implying that subjects of high noise level are sensitive to topic-irrelevant visual shots only if they are of low SNR level.

• Journal of Korea Multimedia Society
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• v.7 no.2
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• pp.231-240
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• 2004

Location Based Service(LBS) system is widely used in Car Navigation Service(CNS), position tracing, tour guide, etc. Recently, the development of a mobile hardware enables us to run various application of software on small handset. Although CNS systems are widely used on personal computer, PDA and embedded machines, small display system of a mobile handset still constrains to make it difficult to developed route visualization and navigation system. In this paper, we propose a new route map visualization system on mobile handset environment for LBS system. We use modified line simplification algorithm that removes extraneous information and places more emphasis on the turning point. We also adopted level of detail route visualization technique for visualization of a detail map. This system improved turn-by-turn method and line drive system, which are widely adopted by current route visualization system.

• Journal of Korea Multimedia Society
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• v.13 no.3
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• pp.475-486
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• 2010

Contents Recommender System predicts user's preferences towards contents, and then recommends highly-predicted contents to user. Digital Identifier plays its part in identifying abstract works or digital contents in digital network environment. Digital Identifier could be effectively used in content-based filtering and collaborative filtering that are mainly used in Contents Recommender Systems. Therefore, this paper proposes an improvement of UCI metadata and resolution service for effective use of UCI in massive contents recommender systems. UCI metadata is expanded by adding elements such as abstract, keyword, genre, age, rate and review. Resolution service allows the operation systems to collect user preference for content by including input part of preference in a result page. This paper also designs and implements an improved UCI operation system and shows that the proposed improvement of UCI metadata and resolution service could be used for massive contents recommendation.

• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.344-350
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• 2003

In this paper, we propose a novel sharing method ordering the events occurring between users collaborated with the common telecomputing environment. We realize the sharing method with multimedia data to improve the coworking effect using teleprocessing network. This sharing method advances the efficiency of communicating projects such as remote education, tele-conference, and co-authoring of multimedia contents by offering conveniences of presentation, group authoring, common management, and transient event productions of the users. As for the conventional sharing white board system, all the multimedia contents segments should be authored by the exclusive program, and we cannot use any existing contents or program. Moreover we suffer from the problem that ordering error occurs in the teleprocessing operation because we do not have any line-up technology for the input ordering of commands. Therefore we develop a method of retrieving input and output events from the windows system and the message hooking technology which transmits between programs in the operating system In addition, we realize the allocation technology of the processing results for all sharing users of the distributed computing environment without any error. Our sharing technology should contribute to improve the face-to-face coworking efficiency for multimedia contents authoring, common blackboard system in the area of remote educations, and presentation display in visual conference.