• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2000년도 제13회 춘계학술대회 및 임시총회 학술발표 논문집
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• pp.194-199
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• 2000

동적 부하 분산 정책은 시스템의 상태를 고려하여 부하 균등화를 결정한다. 이를 위하여 분산형 정책에서는 각 노드가 부하 균등화를 결정하기 전에 적절한 부하 전송 대상을 찾기 위하여 현재의 시스템 상태 정보를 수집한다. 그러나 이 과정에서 프로세서 쓰레싱이 발생하게 된다. 본 논문에서는 프로세서 쓰레싱의 발생 빈도를 감소시키기 위한 새로운 알고리즘을 제안하였다. 그리고 모의실험을 통하여 제안된 알고리즘의 성능 개선을 증명하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1563-1571
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• 2011

In the commercial trains, there are monitors hung on the ceiling which simply display broadcasted contents so a passenger in a cabin has only one choice of passively watching them or not. To lead the application of IT in railway, keep a passenger from tedious journey, or help a passenger having a productive time, an MCS(Multimedia Contents System) was analyzed, designed, and implemented. A passenger can select and use a content from a smart terminal that is attached at the passenger's seat. A smart terminal is one that has its own memory and processor to handle informations and interact with a user. In this paper, the contents, such as train schedule, transfer information, traveling information, e-book, TV, music, and game, that the MCS can provide were introduced. To validate the applicability of the MCS on a next generation high-speed train, a testing environment will be set on a pre-production car and tested. The successful installation of the MCS will boost up the competitive power of the next generation train in the world market.

• 한국멀티미디어학회논문지
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• 제18권5호
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• pp.620-630
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• 2015

This research suggests a load balancing method for a volume rendering system which supports concurrent users. When concurrent users use a volume rendering server system, the computational resources are occupied by a particular user by turns because each process consumes the computational resources as much as possible. In this case, the previous method shows acceptable throughput but the latency is increased for each user. In this research, we suggest a method to improve the latency without performance degradation. Each process makes concessions for taking the resources according to the number of users connected to the system. And we propose a load balancing method in the dynamic situation in which the number of users can vary. Using our methods, we can improve the latency time for each user.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.945-948
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• 2005

In wireless and handheld platforms area, performance, power and cost are key metrics for product success. This is driving increasing levels of on-chip integration in state-of-the-art application processors. The purpose of this project is to optimize and design the energy-efficient embedded system that properly displays video and audio in real time. The requirements are for the media player to be capable of decoding real-time streaming video and audio with the least possible energy consumption for a variety of different clips at different resolutions. We implemented this Linux based multimedia player on Intel's PXA27x platform.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 하계종합학술대회 논문집(1)
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• pp.123-126
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• 2004

Demands on dealing with multimedia data through the network have been increased, and networking multimedia devices require processing, transmitting , and receiving the digital data. In order to implement the network for high performance and low cost, we may have to integrate the dedicated hardware into a system on a chip by spending an extra amount of silicon resource. In this paper, we describe hardware implementation of TCP/IP protocol stack which is now popular to connect multiple PCs and peripherals by means of networks. For evaluation we used ALTERA APEX 20K600EBC652 FPGA with 600,000 gates. The operating frequency is estimated 29.9MHz and it used area of $26\%$.

• 한국멀티미디어학회논문지
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• 제8권6호
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• pp.729-734
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• 2005

In order to access XML data stored in object databases, an efficient index scheme is inevitable. There have been several index schemes that can be used to efficiently retrieve XML data stored In object databases, but they are all the single path indexes that support indexing along a single schema path. Henee, if a query contains an extended path which is denoted by wild character ('*'), a query processor has to examine multiple index objects, resulting in poor performance and inconsistent index management. In this paper, we propose MPI (Multi-Path Index) scheme as a new index scheme that provides the functionality of multiple path indexes more efficiently, while it uses only one index structure. The proposed scheme is easy to manage since it considers the extended path as a logically single schema path. It is also practical since it can be implemented by little modification of the B -tree index structure.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.412-415
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• 1999

In this paper, we describe an implementation of the B-Link bus interface logic for a directory controller and a remote access cash controller in the SCI-based CC-NUMA multimedia server developed by ETRI . The CC-NUMA multimedia server is composed of a number of Pentium III SHV nodes and a SCI interconnection network. To communicate with remote nodes, each node has a CC-Agent which consists of a processor bus interface(PIF). a directory controller(DC), a remote access cash controller(RC), and two SCI 1ink controllers(LCs). The B-Link bus interface logic is developed for a directory controller and a remote access cash controller in order to communicate with a SCI link controller on a B-Link bus. It consists of a sending master controller a receiving slave controller, and asynchronous data buffers. And It performs a self-arbitration, a data packet transmission, a queue allocation, an early terminal ion. and a cut-through data path.

• 한국멀티미디어학회논문지
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• 제18권7호
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• pp.793-805
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• 2015

Nowadays the amount of data obtained from advanced weather radars is growing to provide higher spatio-temporal resolution. Accordingly radar data compression is important to use limited network bandwidth and storage effectively. In this paper, we proposed a hierarchical compression method for weather radar data having high spatio-temporal resolution. The method is applied to radar reflectivity and evaluated in aspects of accuracy of quantitative rainfall intensity. The technique provides three compression levels from only 1 compressed stream for three radar user groups-signal processor, quality controller, weather analyst. Experimental results show that the method has maximum 13% and minimum 33% of compression rates, and outperforms 25% higher than general compression technique such as gzip.

• 한국멀티미디어학회논문지
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• 제20권2호
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• pp.163-169
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• 2017

There are various algorithms evaluating a threshold for image segmentation. Among them, Otsu's algorithm sets a threshold based on the histogram. It finds the between-class variance for all over gray levels and then sets the largest one as Otsu's optimal threshold, so we can see that Otsu's algorithm requires a lot of the computation. In this paper, we improved the amount of computational needs by using estimated Otsu's threshold rather than computing for all the threshold candidates. The proposed algorithm is compared with the original one in computation amount and accuracy. we confirm that the proposed algorithm is about 29 times faster than conventional method on single processor and about 4 times faster than on parallel processing architecture machine.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제5권1호
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• pp.14-28
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• 1999

최근 멀티미디어 데이터로부터 내용에 대한 정보를 추출하여 데이터베이스에 저장하고 내용에 기반한 질의를 수행하도록 하는 내용 기반 검색 시스템이 중요한 핵심 기술로 대두되고 있다. 본 논문에서는 내용 기반 멀티미디어 검색 시스템인 COSMIC(Content Based Multimedia Information Processor)의 설계 및 구현에 관하여 기술한다. COSMIC은 대용량 이미지 데이터로부터 자동으로 추출된 시각적 특징 데이터들을 다차원 점접근 방법(Point Access Method)인 HG-트리를 이용하여 색인하고 예제 이미지와 사용자가 그린 스케치에 의한 시각적 질의를 제공한다. 또한 COSMIC은 비디오 데이터로부터 추출된 다양한 의미 정보를 이용하여 의미 질의를 제공한다. COSMIC의 유효성을 입증하기 위해서 다양한 시각적 질의와 이미 질의를 이용한 실험을 수행하였다.