• Journal of KIISE:Information Networking
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• v.30 no.3
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• pp.424-436
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• 2003

In this paper, we propose the Centroid-based Backbone Core Tree(CBCT) generation algorithm for the shared tree-based IP multicasting. The proposed algorithm is based on the Core Based Tree(CBT) protocol. Despite the advantages over the source-based trees in terms of scalability, the CBT protocol still has the following limitations; first, the optimal core router selection is very difficult, and second, the multicast traffic is concentrated near a core router. The Backbone Core Tree(BCT) protocol, as an extension of the CBT protocol has been proposed to overcome these limitations of the CBT Instead of selecting a specific core router for each multicast group, the BCT protocol forms a backbone network of candidate core routers which cooperate with one another to make multicast trees. However, the BCT protocol has not mentioned the way of selecting candidate core routers and how to connect them. The proposed CBCT generation algorithm employs the concepts of the minimum spanning tree and the centroid. For the performance evaluation of the proposed algorithm, we showed the performance comparison results for both of the CBT and CBCT protocols.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.6
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• pp.57-67
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• 2010

This paper studies thermal characteristics of a mix of CPU-intensive and memory-intensive application workloads on a multi-core processor. Especially, we focus on thermal variations during program execution because thermal variations are more critical than average temperatures and their ranges for thermal management. New metrics are proposed to quantify such thermal variations for a workload. We study the thermal variations using SPEC CPU2006 benchmarks with varying cooling conditions and frequencies on an Intel Core 2 Duo processor. The results show that applications have distinct thermal variations characteristics. Such variations are affected by cooling conditions,operating frequencies and multiprogramming workload. Also, there are distinct spatial thermal variations between cores. Our new metrics and their results from this study provide useful insight for future research on multi-core thermal management.

• Venture DIGEST
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• s.58
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• pp.17-17
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• 2004

모바일 멀티미디어 SoC전문기업 코아로직의 해외영업팀 김영태 팀장은 또래보다 일찍 팀장이 된 촉망받는 인재이다. 중학교 3학년때 미국으로 건너가 대학졸업을 마친 한국계 미국인인 그는 모국인 한국에서 사회인으로 첫발을 내딛었다.

• Journal of Digital Convergence
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• v.12 no.3
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• pp.227-235
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• 2014

Mobile virtualization is an approach to mobile device management in which two virtual platforms are installed on a single wireless device. A smartphone, a single wireless device, might have one virtual environment for business use and one for personal use. Mobile virtualization might also allow one device to run two different operating systems, allowing the same phone to run both RTOS and Android apps. In this paper, we propose the techniques to virtualize the cores of a multicore, allowing the reassign any number of vCPUs that are exposed to a OS to any subset of the pCPUs. And then we also propose the real-time scheduling method to assigning the vCPUs to the pCPU. Suggested technology in this paper solves problem that increases time of real-time process when interrupt are handled, and is able more to fast processing than previous algorithm.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.200-203
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• 2001

정보 보안의 기수로 떠오른 지문인식 분야는 크게 분류와 인증 단계로 나뉜다. 본 논문은 지문의 분류에 대한 연구결과로, 효율적인 지문 분류를 위해 방향성 이미지로부터 일정 영역내 방향각의 분포도에 대한 분산을 이용한 새로운 지문 분류 알고리즘을 제안한다. 또한 구해진 분산을 토대로 특이점(코아. 델타) 가능 영역을 선정하고 선정된 영역에 대해 의사 특이점을 제거후 지문을 분류하고 마지막으로 실험을 통해 제안된 알고리즘을 검증하고 문제점을 검토해 본다.

• 정보화사회
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• s.189
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• pp.68-68
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• 2007

한국 팹리스산업은 지난 몇 년간 해외 경쟁사들 보다 우위를 점할 수 있는 분야를 개척해왔다. 대표적인 국내 팹리스 기업들로는 휴대폰용 멀티미디어 분야의 코아로직, ISP분야의 엠텍비젼, MP3칩 분야의 텔레칩스, LCD관련 분야의 TLI, 메모리 관련분야의 EMLSI 등을 들 수 있다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3111-3113
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• 1999

임베디드 메모리로직에 적용되는 매크로셀을 지니고 전류형태의 저장방법을 적용한 캐시를 통한 임베디드 메모리칩의 설계의 일환으로 0.25마이크로 공정으로 설계되었으며 멀티미디어 칩에 사용되는 메모리 코아는 캐시를 지니고 있음으로 칩의 밴드위스를 높이고 칩의 어드레스 억세스시간(10nS)을 빠르게 할 수 있었으며 이를 위한 내부공급전압은 2.0V이다. 본 논문의 아키텍쳐에서는 기존 메모리 소자의 전송형태를 전류형 전송수단을 이용하여 매크로 셀의 데이터를 캐시에 저장하고, 이를 전류형태의 메인 데이터증폭회로를 통하여 전송하게된다. 이를 이루기 위한 칩의 아키텍척로 비트라인과 캐시의 연결회로를 추가한 구조를 제안하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.209-214
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• 2014

IMS(IP Multi-Media Subsystem) is in the limelight as the Integrated wire and wireless Systems because of a sudden increase of smart mobile devices and growth of multimedia additional services such as IPTV. The structure of IMS is designed as a session control layer to provide various multimedia summative service using SIP based on IP communication network in order to carry out set-up, change and release by NGN of course, the existing voice services. But now It is broadly substituting in the IPTV, wire phone company and it is substituted in internet platform base on the soft-switch in currently. Especially, in currently, 4G LTE in a mobile communication company is rapidly growing in market. Therefore, in this study, we had designed and developed to the main prosser that can admit to 1000 user over and SIP gateway which can link the IMS Core that can link SIP Device which adopt the standard protocol on the SIP and to provide variable multimedia services.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.410-415
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• 2002

This paper describes the implementation of a SoC(System-on-a-Chip) and an ISDN communication terminal by the SoC in ISDN network. The SoC has been developed with the functions of 32-bit ARM7TDMI RISC core processor, network connection with S/T interface, TDM--bus interface and voice codec, user interface. And we also review the developed software structure and the ISDN service protocol procedures which are working on the SoC. And finally this paper describers a structure of an ISDN terminal equipment using the implemented SoC and terminal software.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.1
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• pp.89-98
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• 2002

Optical current sensor and optical voltage sensor modules were designed and fabricated to improve measurement error and insulation in automatic power distributor By using Faraday effect, optical current sensor with an $\alpha$-iron core was designed and fabricated to minimize current induction of the other phase and was optimized to maintain linearity. Optical voltage sensor was fabricated owing to the pockets effect and adopted spatial electric field type because of small room in an automatic power distributor. To connect a distributor with an external terminal for signal processing, optical multi connector was designed, fabricated and tested for coupling loss and gas leakage. The linearity of optical current sensor for applied current maintains variation of smaller than 2.5% for applied current range from 20A to 700A. The linearity of optical voltage sensor was smaller than 1% for appling voltage from 6.6kV to 19.8kV. Since the measured characteristics are good, these devices can be considered as being applicable in practice.