• 한국멀티미디어학회논문지
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• 제20권7호
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• pp.1113-1128
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• 2017

This study was practiced in order to develop a textbook to improve early childhood teachers' ability to use multimedia required by kindergartens and to examine its effects. First, investigation of the status of multimedia application of early childhood teachers in kindergartens was done along with looking through their attitude and anxiety. The expertise and the multimedia education was required in early childhood education and curriculum. As a result, 15 categories and 50 subcategories under 4 themes were drawn through the procedures of qualitative analysis. The conclusions obtained through this study were the following: First, the education for multimedia application related to the tasks required in kindergartens is needed instead of the common education for multimedia application, to improve the ability to use multimedia for early childhood teachers. Second, multimedia education based on visual theory for the purpose of early childhood education, rather than common features-centered multimedia education, is helpful for the improvement of early childhood teachers' ability to use multimedia. Finally, the improvement of early childhood teachers' ability to use multimedia will be a chance to provide children with a better educational environment.

• 교육시설
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• 제5권4호
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• pp.39-45
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• 1998

In this information-oriented society, the ability to manage and process the rapidly increasing amount of information has become an absolute requirement. Students of today must prepare for the challenges of the upcoming 21st century through developing skills in computers and by nurturing a creative mind and the aptitude to resolve problems. In terms of its pedagogical function and range and applicability, multimedia will surpass all other tools of education, owing to its flexibility and openness. This study provides actual case examples of the construction and utilization of the multimedia environment and proposes factors that must be considered in the construction of the multimedia environment.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.499-502
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• 1999

This paper presents a PCI (Peripheral Component Interconnect) controller embedded in a multimedia processor, called FLOVA (FLOating point VLIW Architecture), targeting for 3D graphics applications. Fast I/O interfaces are essential for multimedia processors which usually handle large amount of multimedia data. Therefore, in FLOVA, PCI bus is adopted for I/O interface due to fast burst transaction. However, there are several problems in implementation and verification to use burst transaction of PCI. It is difficult to handle data transaction between two units which have two different operating frequency. FLOVA has more higher operating frequency about 100MHz than that of PCI local bus and it makes lower utilization of FLOVA bus. Also, traditional simulation is not sufficient for verification of PCI functionality. In this paper, we propose buffering schemes to implement the PCI controller with wide bandwidth and high bus utilization. Also, this paper shows how to verify the PCI controller using real PCI bus environments before its fabrication.

• ETRI Journal
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• 제24권3호
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• pp.251-254
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• 2002

We developed a method for optimal superframe design in the multi-frequency time division multiple access (MF-TDMA) return-link of a satellite multimedia interactive network called a digital video broadcasting return channel over satellite (DVB-RCS) sub-network. To find the optimal superframe pattern with the maximum data throughput, we formulated the design problem as a non-linear combinatorial optimization problem. We also devised the proposed simple method so that it would have field applicability for improving radio resource utilization in the MF-TDMA return link.

• 한국멀티미디어학회논문지
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• 제9권2호
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• pp.197-207
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• 2006

공정 패킷 스케줄러에서 트래픽 흐름의 속도에 의해 결정되는 최대전달지연이 그 흐름의 요구 지연규격을 위반할 경우 예약속도를 높여서 이를 줄여야 한다. 이러한 과잉예약의 결과로 전송대역폭이 손실되나, 이전연구에서 사용되었던 레이턴시, 공정성 및 구현복잡성의 세가지 성능지표로는 손실대역폭을 평가할 수 없다. 본 논문에서는 스케줄링 서버 자원의 손실특성을 평가할 수 있는 대역폭 이용도 지표를 제안하고, 대역폭 및 페이로드(payload) 이용도 측면에서 공정 패킷 스케줄러의 성능을 분석 및 평가하였다. 평가결과 요구 지연규격이 느슨할수록 높은 페이로드 이용도를 얻을 수 있었고, 특히 WFQ급 레이턴시를 갖는 스케줄러의 페이로드 이용도가 SCFQ에 비해 50%까지 개선됨을 발견할 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제22권1호
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• pp.135-141
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• 2017

This thesis progressed research on the improvements of NCS multimedia utilization for preliminary teachers. A national module has not been developed yet in terms of child education, so this thesis suggests a curriculum according to the courses taught for freshmen and sophomores of K University Child Education majors. To lessen the burden of tremendous work and classes, provide motivation and interest in learning and maximize the effect, this thesis provides NCS based curriculum. It expects to improve task performance of teachers and help them with better skills to make class materials using up-to-date multimedia, regardless of the computer literacy of preliminary teachers. This thesis does prior research on the abilities to make use of computers and understand the level of computer literacy. Then it suggests NCS based curriculum goals and its performance standards to utilize task-suitable software. It aims to enable efficient multimedia usage, and optimize the learning efficiency of education linked to Nuri precesses.

• 한국멀티미디어학회논문지
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• 제16권9호
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• pp.1067-1076
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• 2013

Known as an important criterion that evaluates performance of future high-speed backbone networks, burst data loss ratio is well-studied in Optical Burst Switching networks. Current literatures mostly focus on reduce burst loss ratio without considering the system stability and link utilization after reducing. In this paper, we propose a novel framework which comes from feedback theoretic to dynamically control burst loss ratio in OBS. The proposed scheme tries to track the pre-set values of burst loss ratio and increases the stability and link utilization degree. The simulation results show that measured burst loss ratio always tracks setup reference with small errors, wavelength channel utilization is increased up to 2% and the system stability is also improved.

• 한국컴퓨터정보학회논문지
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• 제17권1호
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• pp.141-149
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• 2012

본 연구에서는 이종 무선융합망에서 실시간 서비스 품질의 지속성을 보장하면서도 자원의 이용도를 극대화하기 위한 자원운영 방안인 PRA(Priority Resource Allocation)를 제안한다. PRA에서는 예약된 자원을 사용하여 실시간 서비스 데이터를 우선적으로 전송하되 그 전송률이 감소하면 비실시간 서비스가 여분의 대역폭을 일시적으로 이용한다. 실시간 세션의 가변 전송률에 근거한 통계적 다중화 기법을 통하여 PRA 방식이 실시간 서비스의 품질을 만족시키면서도 동시에 접속 가능한 가입자 수를 최대화할 수 있음을 시뮬레이션에 의해 확인한다.

• 정보관리연구
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• 제35권2호
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• pp.41-55
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• 2004

본 연구에서는 딸림자료 중 특히, 오디오 테이프 형태의 자료를 디지털화하여 멀티미디어 데이터베이스를 구축함으로써 이용자의 이용편의와 자료관리의 효율성을 제고하는 것에 대한 방안에 대해 논의하고자 한다. 이를 위해 본고에서는 딸림자료의 관리현황, 오디오 데이터 포맷의 종류, 데이터 포맷변환, 관리 및 이용방안 등을 살펴보았다. 또한, 딸림자료의 멀티미디어 데이터베이스 구축을 통한 기대효과 및 문제점을 제시하였다.

• ETRI Journal
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• 제32권5호
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• pp.657-664
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• 2010

Many embedded multimedia systems employ special hardware blocks to co-process with the main processor. Even though an efficient handling of such hardware blocks is critical on the overall performance of real-time multimedia systems, traditional real-time scheduling techniques cannot afford to guarantee a high quality of multimedia playbacks with neither delay nor jerking. This paper presents a hardware-aware rate monotonic scheduling (HA-RMS) algorithm to manage hardware tasks efficiently and handle special hardware blocks in the embedded multimedia system. The HA-RMS prioritizes the hardware tasks over software tasks not only to increase the hardware utilization of the system but also to reduce the output jitter of multimedia applications, which results in reducing the overall response time.