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- 저자 : Jin Hyeok Ko(고진혁) (검색결과 4 건)
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차등화 서비스의 QoS 향상을 위한 FM 제어기에 기반한 CIR 추정
고진혁(Jin-Hyeok Ko),박기광(Ki-Kwang Park),황영호(Young-Ho Hwang),양해원(Hai-Won Yang) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
This paper presents design of meter for estimation Committed Information Rate(CIR) in Differentiated Services(DiffServ) networks. The DiffServ is a target model rather than a specification that contains detailed information about the required implementation. DiffServ provides a moderate level of quality differentiation without strict guarantees[1]. A DiffServ router consists of different components including classifier, meter, marker, dropper, shaper and scheduler. In this paper, we use the benefits of the fuzzy logic controller to design a fuzzy based traffic conditioner for DiffServ[2]. Simulations show that the approach is efficient and promising.
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이동철,고진혁,김동한,Lee Dong Chul,Ko Jin Hyeok,Kim Dong Han 대한정형외과스포츠의학회 2003 대한정형외과스포츠의학회지 Vol.2 No.1
목적: 스키손상에서슬관절인대손상의형태와영향을줄수있는인자를분석하고, 수상전후의슬관절기능평가및스포츠활동도변화를알고자하였다. 대상및방법: 슬관절인대손상환자30명을대상으로설문및이학적검사, X선및MRI 촬영을통한평가를하였고, 기능평가는Lysholm Knee Scoring Scale, 스포츠활동도는Tegner activity score로평가하였다. 결과: 내측측부인대손상을동반한전방십자인대손상이11명으로가장많았고, 내측측부인대손상이9명으로그다음이었다. 수상기전은유령발현상(phantom foot phenomenon)과외전-외회전기전이각각13례와12례로83 $\%$를차지했다. 최종추시에서평균Lysholm score는93.4점으로매우양호하였으며, 활동도는수상전Tegner activity score 6.1점에서수상후4.2점으로감소되었다. 기능과활동도평가에서내측측부인대단독손상군이경과가가장양호하였으며, 내측측부인대손상을동반한전방십자인대손상군이경과가불량하였다. 스키손상에영향을미칠수있는요인으로는스키를지속적으로2시간이상탄경우, 바인딩이풀리지않는경우, 적절한스키강습프로그램을받지않은경우였다. 결론: 환자들의수상후Lysholm score는매우양호했지만, 수상후스포츠활동도에서는수상전과뚜렷한차이를보여적극적이고체계적인스포츠복귀프로그램이필요함을알수있었다. Purpose: This study is to analyse the injury patterns of knee ligament and the factors influencing ligament injuries of knee, and to evaluate the changes of knee function and activity after ski injury. Materials and Methods: Thirty cases of ligament injuries of knee were studied with a questionaire, stress radiographs, magnetic resolution imaging, and physical examination. Mean age was 28.6 years old and mean follow up was 29.6 months. Clinical evaluation of Lysholm knee scoring scale was used for knee function and Tegner activity score was used for activity change after ski injury. Results: The anterior cruciate ligament (ACL) injury accompanied with medial collateral ligament(MCL) injury was most in 11 cases and isolated MCL injury was the next in 9 cases. The common types of injury mechanism were Phantom foot phenomenon (13 cases, 43$\%$) and valgus external rotation injury (12 cases, 40$\%$), which constitute 83$\%$ of all case. At the last follow up, the mean Lysholm score was 93.4 and mean Tegner activity score was 4.2. The reduced Tegner activity score after injury was 1.9. Among several injury groups, the evaluation of knee function and activity was best in the isolated MCL injury group and worst in the ACL injury accompanied with MCL injury group. The factors to influence ski injury were participation to ski class, release of binding, and skiing long time more than 2 hours. Conclusions: Lysholm score at last follow up revealed good grading, but sports activity after ski injury was reduced when compared with pre-injury state. It seems to need a active, systemic sports rehabilitation program after sports injury.
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Sliding Mode Congestion Control of Differentiated-services Networks
Ki Kwang Park(박기광),Young Ho Hwang(황영호),Jin Hyeok Ko(고진혁),Hai Won Yang(양해원) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, we propose sliding mode congestion controller for differentiated-services network. Two important issue in differentiated-services architecture are bandwidth guarantee and fair sharing of unsubscribed bandwidth among TCP flows with and without bandwidth reservation. We use tight upper and lower bounds for various settings of differentiated-services parameters using the loss-bounded model. The Sliding mode congestion controller scheme is designed using nonlinear control theory based on a nonlinear model of the network that is generated using fluid flow consideration. The methodology used is general and independent of technology, as for example TCP/IP or ATM. The sliding mode congestion controller methodology has been applied to an TCP network. We use NS-2 simulation to demonstrate that the proposed control methodology achieves the desired behavior of the network, and possesses important attributes. as e.g, stable and robust behavior, high utilization with bounded delay and loss, together with good steady-state and transient behavior.
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DBpia
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