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Adaptive Forward Error Correction Scheme for Real-Time Communication in Satellite IP Networks
( Sungrae Cho ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.6
In this paper, a new forward error correction (FEC) protocol is proposed for point-to-multipoint satellite links. Link-layer error control protocols in point-to-multipoint satellite links impose several problems such as unreliability and receiver-heterogeneity. To resolve the problem of heterogeneous error rates at different receivers, the proposed scheme exploits multiple multicast channels to which each receiver tunes. The more channels a receiver tunes to, the more powerful error correcting capability it achieves. Based on its own channel condition, each receiver tunes to as many channels as it needs, which prevents from receiving unwanted parities. Furthermore, each receiver saves the decoding time, processing overhead, and processing energy. Performance evaluation shows that the proposed scheme guarantees the target PER while saving energy. The proposed technique is highly adaptive to the channel variation with respect to the throughput efficiency, and provides scalable PER and throughput efficiency.
WEB-BASED REMOTE CONTROL SYSTEM FOR MOBILE TERMINAL
Sungrae Cho,Hyunki Ryu 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
The main purpose of this paper is to propose Web-based remote control system for mobile terminal, named Remote Phone Device Manager (RPDM), which uses technology of open mobile alliance device management (OMA DM). This system is capable of active inquiring and configuring the personal information of wireless-enabled mobile terminals from the user via Web browser. This paper designed and implemented DM client module on Symbian S60 Platform which is the dominating open platform for mobile terminals. The architecture of DM client module includes platform adaptation layer (PAL) to maximize portability against various S/W platforms. And we verified protocol behavior of DM client module using SyncML conformance test suit for device management (SeTS) provided by OMA. By using this module, we also designed and implemented the RPDM consisting of DM client/server, RPDM client/server. RPDM showed the new controlling method for mobile terminals via Web interface.
OSEK/VDX 기반 차량용 운영체제의 구현 및 신뢰성 확보 방안
조성래(Sungrae Cho),류현기(Hyunki Ryu),진성호(Sungho Jin),이준호(Junho Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
OSEK/VDX defines an industry standard for automotive operating system and middleware. Recently, some European automotive embedded solution companies release Operating Systems based on OSEK/VDX standard. This paper introduces an implementation of Operating System based on OSEK/VDX standard. For better performance, after we analyze the characteristic of automotive application SWs and requirements of OSEK/VDX standard, and then we propose a new method that enhances scheduling speed of Operating System. Also, We introduce a method for improving the portability of our implementation for various MCUs. And, we introduce the conformance test of OSEK/VDX MODISTARC project for obtaining the reliability of OSEK OS. Finally, we show a simple application SW for body control based on our implementation.
조성래(Sungrae Cho),황도삼(Dosam Hwang),최기선(Keysun Choi) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅱ
현재의 자동색인 시스템들은 주로 정보검색을 하기 위한 목적으로 개발되고 있으며 단일서적(저술 분야)색인에 관한 연구는 아직 미진한 상태이다. 또한 워드프로세서의 발달로 인해 단일서적에서 다양한 문서 특징이 나타나게 되었다. 본 논문에서는 관련 서적들의 색인어를 이용한 유사도 기반의 방법과 단일 서적의 문서 특징을 이용한 자동색인 기법을 제안한다. 제안한 기법의 평가를 위해 이미 출판된 서적을 대상으로 한 자동색인 시스템을 개발하고 자동추출 색인어와 수작업 색인어를 비교하였다. 관련 서적내의 색인어와 새로운 대상 문서간의 유사도 비교를 통해 색인어를 추출함으로써 통계적 빈도에 의존하는 색인 기법에서 발생하는 색인어 오추출과 과다한 색인어 추출을 줄일 수 있었다.
Therapeutic effects of hyaluronidase on acquired lymphedema using a newly developed mouse limb model
Roh, Kangsan,Cho, Sungrae,Park, Jae-hyun,Yoo, Byong Chul,Kim, Won-Ki,Kim, Seok-ki,Park, Kyewon,Kang, Hee,Ku, Jin-mo,Yeom, Chang-Hwan,Lee, Kyunghoon,Lee, Sukchan SAGE Publications 2017 Experimental biology and medicine Vol.242 No.6
<P>Acquired lymphedema is one of the most dreaded side effects of cancer treatment, such as surgical treatment or irradiation. However, due to the lack of appropriate animal models, there is no effective therapeutic method to cure acquired lymphedema. To develop a reproducible acquired lymphedema animal model, we devised a mouse hind limb model by removing a superficial inguinal lymph node, a popliteal lymph node, a deep inguinal lymph node, and the femoral lymphatic vessel. We measured the volume of lymphedematous leg and observed the change in level of hyaluronic acid (HA) and lymphangiogenic factors after injecting hyaluronidase. Our model showed the distinguishable swelling and the reliable symptoms compared to previously reported models. In the lymphedematous regions of our model, we confirmed that HA, a major component of extracellular matrix, accumulated to higher levels than in a normal mouse. This lymphedema volume was rapidly reduced by treating hyaluronidase. Following hyaluronidase injection, the lymphedematous region of our model resembled a normal hind limb. Our findings indicated that hyaluronidase promoted lymphangiogenesis on the lymphedematous limb. Based on hyaluronidase treatment in the lymphedematous region, this could potentially be a new therapeutic approach for acquired lymphedema mediated through the modification of the size of HA fragments.</P>
Log-Based Admission Control Scheme for Dynamic Spectrum Access Networks
NA, Woongsoo,CHO, Sungrae The Institute of Electronics, Information and Comm 2011 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb94 No.10
<P>Dynamic spectrum access (DSA) has drawn immediate attention recently since it can opportunistically exploit any spectrum holes and thus improve bandwidth utilization. From the perspective of medium access control (MAC) design, the QoS requirement of SU is one of the design issues in DSA network. In this paper, we propose a new admission control scheme referred to as log-based dynamic spectrum access admission control (DSAC) aiming at (1) protection of the primary users and (2) QoS prioritization for the existing secondary users. The DSAC algorithm protects the PU by limiting SUs' access using PU's arrival log or statistics. Furthermore, the DSAC reserves a channel for previously admitted SU to reduce frequent service disruption of the SU. Reservation of channels is carried out without assuming any specific arrival process, and thus the DSAC would be practical for general user arrival patterns unlike the existing admission control techniques. Performance evaluation has shown that the proposed DSAC outperforms existing admission control schemes with respect to the PU blocking rate, SU communication stability, and SU aggregate throughput by about 13%, 26%, and 20%, respectively.</P>
Improving Performance of Remote TCP in Cognitive Radio Networks
( Hyun Yang ),( Sungrae Cho ),( Chang Yun Park ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.9
Recent advances in cognitive radio technology have drawn immense attention to higher layer protocols above medium access control, such as transmission control protocol (TCP). Most proposals to improve the TCP performance in cognitive radio (CR) networks have assumed that either all nodes are in CR networks or the TCP sender side is in CR links. In those proposals, lower layer information such as the CR link status could be easily exploited to adjust the congestion window and improve throughput. In this paper, we consider a TCP network in which the TCP sender is located remotely over the Internet while the TCP receiver is connected by a CR link. This topology is more realistic than the earlier proposals, but the lower layer information cannot be exploited. Under this assumption, we propose an enhanced TCP protocol for CR networks called TCP for cognitive radio (TCP-CR) to improve the existing TCP by (1) detection of primary user (PU) interference by a remote sender without support from lower layers, (2) delayed congestion control (DCC) based on PU detection when the retransmission timeout (RTO) expires, and (3) exploitation of two separate scales of the congestion window adapted for PU activity. Performance evaluation demonstrated that the proposed TCP-CR achieves up to 255% improvement of the end-to-end throughput. Furthermore, we verified that the proposed TCP does not deteriorate the fairness of existing TCP flows and does not cause congestions.