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영상 스트리밍 서비스를 위한 우선순위 버퍼 혼잡제어 알고리즘
김승훈,최재원,최승식,Kim, Seung-Hun,Choi, Jae-Won,Choi, Seung-Sik 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.4B
최근 네트워크 기술이 발전하면서 사용자들의 요구가 다양화되고 대용량의 멀티미디어 데이터에 대한 필요성이 증가하고 있다. 실시간성과 동시성이 중요시 되는 멀티미디어 데이터의 전송에는 UDP(User Datagram Protocol) 트래픽이 사용되고 있는데, UDP 트래픽은 현재의 인터넷 기반인 TCP(Transmission Control Protocol) 트래픽과 경쟁 관계에 있어 네트워크의 혼잡을 초래하는 경우가 많았다. 반면 TCP 트랙픽은 네트워크의 혼잡제어를 수행하지만 수신자의 관점을 고려하지 않은 점이 있어서 스트리밍 전송에는 적합하지 않은 단점을 가지고 있다. 본 논문에서는 네트워크의 형평성 문제를 해결하고 수신자의 관점에서 RTP/RTCP(Real-time Trasport Protocol/Realtime Transport Control Protocol)를 기반으로 하는 네트워크 알고리즘을 제안한다. 네트워크에 우선순위를 적용하여 수신자의 버퍼를 고려한 혼잡제어 알고리즘인 POBA(Priority-Ordered Buffer Algorithm)는 시뮬레이션 결과를 통해 우선 순위가 없는 기존 네트워크에 비해 패킷 손실률과 버퍼 점유도 면에서 스트리밍 전송에 적합한 환경을 제공하고 있음을 확인할 수 있었다. According to the recent development of network technology, the demands of users are diversified and the needs of multimedia traffic are increasing. In general, UDP(User Datagram Protocol) traffic is used to transport multimedia data, which satisfied the real-time and isochronous characteristics. UDP traffic competes with TCP traffic and incur the network congestion. However, TCP traffic performs network congestion control but does not consider the receiver's status. Thus, it is not appropriate in case of streaming services. In this paper, we solve a fairness problems and proposed a network algorithm based on RTP/RTCP(Real-time Transport Protocol/Realtime Transport Control Protocol) in view of receiver status. The POBA(Priority Ordered Buffer Algorithm), which applies priorities in the receiver's buffer and networks, shows that it provides the appropriate environment for streaming services in view of packet loss ratio and buffer utilization of receiver's buffer compared with the previous method.
몰드 오실레이터 이중구조 실린더의 정현파 진동 특성을 이용한 위치동기화 알고리즘 개발
김승훈,최두철,공남웅,김상우,Kim, Seung Hun,Choi, Doo Chul,Kong, NamWoong,Kim, Sang Woo 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
Improvement in the control strategy for continuous casting is a crucial requirement to enhance the slab's quality and to increase productivity. The mold oscillator adopts the dual cylinders due to its heavy weight, so the synchronized motion of two cylinders is an important aspect when precise control is needed. The conventional method uses the master-slave control applied to the valve input reference, but the synchronization performance should still be improved. This paper proposes a novel synchronization algorithm for dual cylinders used in a mold oscillator. The master-slave concept is applied to the target reference position, that is, the slave target reference position is controlled to match the slave cylinder's position with the master cylinder's position. In the simulation based on a Simulink model, the proposed algorithm shows a better synchronization performance in aspect of the mean of the absolute error and the peak synchronization error.
연속 CIP 공법으로 형성된 PUS 부재의 단면 설계 및 휨 강도 산정
김승훈,노삼영,홍성진,김갑수,한범석,Kim, Seung-Hun,Noh, Sam-Young,Hong, Seong-Jin,Kim, Kap-Soo,Han, Byum-Seok 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
Recently the Permanent Uni-wall System (PUS) has been developed which improved the disadvantage of the CIP and could be used as permanent retaining wall. The sections of PUS members are molded with circle casing form and deformed casing form. In the generality of cases, deformed casing section consists of reinforced concrete because of the concrete cover by code and the method of concreting with tremie pipe. But, circle casing section can be designed with various structural types which are steel, reinforced concrete, and steel reinforced concrete(SRC). In this study, design methods for PUS section were proposed and two types of PUS section were tested to investigate the flexural strength and behaviors. Variable was the details of circle casing section which were the deformed bars and the shear reinforcements surrounded H beam. All specimens failed due to concrete crushing. Specimen with SRC section in circle casing showed more ductile behavior after ultimate flexural strength than the other specimen. Nominal flexural strengths by section analysis and design code based on a strain-compatibility approach were compared with test results. These comparisons showed that PUS section possessed the flexural strength by design code.
연속 CIP 공법으로 형성된 PUS 부재의 단면 설계 및 휨 강도 산정
김승훈(Kim, Seung-Hun),노삼영(Noh, Sam-Young),홍성진(Hong, Seong-Jin),김갑수(Kim, Kap-Soo),한범석(Han, Byum-Seok) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.6
Recently the Permanent Uni-wall System (PUS) has been developed which improved the disadvantage of the CIP and could be used as permanent retaining wall. The sections of PUS members are molded with circle casing form and deformed casing form. In the generality of cases, deformed casing section consists of reinforced concrete because of the concrete cover by code and the method of concreting with tremie pipe. But, circle casing section can be designed with various structural types which are steel, reinforced concrete, and steel reinforced concrete(SRC). In this study, design methods for PUS section were proposed and two types of PUS section were tested to investigate the flexural strength and behaviors. Variable was the details of circle casing section which were the deformed bars and the shear reinforcements surrounded H beam. All specimens failed due to concrete crushing. Specimen with SRC section in circle casing showed more ductile behavior after ultimate flexural strength than the other specimen. Nominal flexural strengths by section analysis and design code based on a strain-compatibility approach were compared with test results. These comparisons showed that PUS section possessed the flexural strength by design code.
하지철물 접합부 유격방지 브라켓을 적용한 접합부의 거동에 관한 실험적 연구
김승훈 ( Kim Seung Hun ),백기열 ( Baek Ki Youl ),김성범 ( Kim Seong Beom ),김권식 ( Kim Kown Sik ),홍성욱 ( Hong Seong Uk ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
In recent years, non-welded building hardware that can be installed by bolt assembly is used, which does not require fire prevention related materials, fire fighting equipment and personnel. However, there is a need for a method to compensate for the occurrence of buckling at the bolted portion at the time of construction.The purpose of this study is to evaluate the behavior of joints that can control the sliding between members by using anti slip brackets.
철근 이음형 프리캐스트 콘크리트 보-기둥 내부 접합부의 구조적 거동에 관한 실험적 연구
김승훈(KIm Seung-Hun),문정호(Moon Jeong-Ho),이리형(Lee Li-Hyung) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
In this study, new moment-resisting precast concrete beam-column joint is proposed for moderate seismic regions. It has the splice type reinforcing bars, penetrated the joint and lap-spliced with the bottom bars of precast U-beam. An experimental study was carried out to investigate the joint behavior subjected to reverse cyclic loading and constant axial compressive load. Three precast beam-column interior were tested. The variables examined were the diameter of splice type reinforcing bar and the presence of transverse reinforcement in the joint Structural performance of joint is evaluated on the basis of connection strength, stiffness, energy dissipation, and drift capacity. Based on the test results, the precast connection is capable of matching or exceeding the performance of the monolithic connection and thereby provides the sufficient moment-resisting behavior to be applicable for moderate seismic regions.
집중 충돌 병렬 처리를 위한 효율적인 다중 코어 트랜잭셔널 메모리
김승훈(Seung Hun Kim),김선우(Sunwoo Kim),노원우(Won Woo Ro) 大韓電子工學會 2011 電子工學會論文誌-CI (Computer and Information) Vol.48 No.1
다중 코어 프로세서의 보급과 더불어 이를 효율적으로 활용하기 위한 병렬 프로그래밍의 중요성은 나날이 강조되고 있다. 트랜잭셔널 메모리는 병렬 프로그래밍의 핵심적인 요소인 동기화(Synchronization)를 위해 제안된 구조로서 lock을 사용한 동기화로 인해 발생하는 병렬성 저하, deadlock 등의 문제를 극복할 수 있다. 본 논문은 높은 수준의 contention 상황에 따른 효율적인 트랜잭셔널 메모리의 구조에 대한 이론적인 분석을 제시하며 시뮬레이션을 통해 분석의 타당성을 확인한다. 시뮬레이션 환경은 하드웨어 트랜잭셔널 메모리(Hardware Transactional Memory) 시스템으로 구성되었으며 이론의 검증을 위해 STAMP 벤치마크와 높은 contention을 유발하는 프로그램을 시뮬레이션 하였다. 또한 트랜잭셔널 메모리를 적용한 dining philosopher problem의 모델링을 통해 효율적인 자원 할당 방안에 있어 lazy 데이터 관리 정책이 유리함을 보였다. The importance of parallel programming seriously emerges ever since the modern microprocessor architecture has been shifted to the multi-core system. Transactional Memory has been proposed to address synchronization which is usually implemented by using locks. However, the lock based synchronization method reduces the parallelism and has the possibility of causing deadlock. In this paper, we propose an efficient method to utilize transactional memory for the situation which has high contention. The proposed idea is based on the theoretical analysis and it is verified with simulation results. The simulation environment has been implemented using HTM(Hardware Transactional Memory) systems. We also propose a model of the dining philosopher problem to discuss the efficient resource management using the transactional memory technique.
김승훈 ( Kim Seung-hun ),한효준 ( Han Hyo-jun ),노신진 ( Roh Shin-jin ),이지형 ( Lee Ji-hyeong ),이용택 ( Lee Yong-taeg ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
본 연구에서는 고력볼트를 이용하여 목재에 대한 CFRP 판의 부착성능을 향상시키기고자 하였으며, 이에 대한 휨 보강성능 평가를 위하여, 레드파인 재질의 보를 고력볼트에 의하여 단부 정착시킨 CFRP 판으로 보강한 실험체와 무보강실험체를 제작하여 휨실험을 실시하였다. 실험결과 모든 실험체가 목재의 인장측 쪼개짐에 의한 휨파괴로 최종파괴되었으며, 고력볼트로 CFRP 판을 단부정착 보강한 실험체들의 평균 최대내력이 무보강 실험체들에 비하여 약 63.0% 크게 나타나 본 보강상세에 의한 휨보강 성능이 우수한 것으로 평가되었다.