• 한방비만학회지
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• 제2권1호
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• pp.63-72
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• 2002

Objectives: The objectives of this study is the examination of physiology of the obesity by automatic bioelectric response recorder. Methods: The 86 patients below BMI 20 and the 144 patients over BMI 25 were objectives. They visited Dongguk University Kangnam oriental medical hospital from 2000. April 1 to 2001 August 30. Results :The patients below BMI 20 were accelerated a parasympathetic nerve and were decelerated a sympathetic nerve, so they loosened the tension, lacked the resistance and were oversensitive. The patients over BMI 25 were accelerated a sympathetic nerve and were decelerated a parasympathetic nerve, so they maintained the tension and the resistance.

• 제어로봇시스템학회논문지
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• 제6권8호
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• pp.638-651
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• 2000

When the bandwidth resources in a packet-switched network are shared among sessions by MAX-MIN flow control each session is required to transmit its data into the network subject to the MAX-MIN fair rate which is solely determined by network loadings. This passive behavior of sessions if fact can cause seri-ous QoS(Quality of Service) degradation particularly for real-time multimedia sessions such as video since the rate allocated by the network can mismatch with what is demanded by each session for its QoS. In order to alleviate this problem we extend the concept of MAX-MIN fair bandwidth allocations as follows: Individual bandwidth demands are guaranteed if the network can accommodate them and only the residual network band-width is shared in the MAX-MIN fair sense. On the other hand if sum of the individual bandwidth demands exceeds the network capacity the shortage of the bandwidth is shared by all the sessions by reducing each bandwidth guarantee by the MAX-MIN fair division of the shortage. we present a novel flow control algorithm to achieve this extended MAX-MIN fairness and show that this algorithm can be implemented by the existing ATM ABR service protocol with minor changes. We not only analyze the steady state asymptotic stability and convergence rate of the algorithm by appealing to control theories but also verify its practical performance through simulations in a variety of network scenarios.

• 한국정보처리학회논문지
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• 제7권4호
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• pp.1211-1216
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• 2000

ATM은 패킷 데이터 서비스 통신에 적합한 통신방식으로 데이터, 음성, 영상 등의 서비스를 동시에 지원할 수 있다. 이러한 ATM의 QoS를 보증하기 위해서는 패킷 데이터를 전송하는 소스 비율에 대해 네트워크 초과적조 조건을 조절하는 것이 필요하는데 대부분의 제어알고리즘이 임계값을 기반으로 한 피드백 제어방식이다. 그러니 실시간 음성 트레픽과 같은 서비스는 네트워크 상에서 데이터 서비스 동안에 동적인 연결이 설정되고 종료될 수 있으므로 피드벡 제어정보가 지연된다면 고속으로 서비스된 음성 데이터에 대한 품질은 소스의 목적지 사이의 시간 지연으로 인해 손실될 수 있다. 본 논문에서는 제시된 최소평균제곱오차에 근거를 둔 제어 알고리즘은 예시적인 피드백 제어로 피드백 제어를 위해 미지함수의 기울기와 버퍼크기를 이용하여 미래의 버퍼크기를 예측하려 하였으며 시뮬레이션 질과 본 논문에서 제시한 제어 알고리즘은 효과적임이 증명되었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(3)
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• pp.81-84
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• 2000

Scheduling algorithm proposed in this paper is based on both DWRR(Dynamic Weighed Round Robin) method and QLT(Queue Length Threshold) method. The proposed scheduling algorithm guarantees delay property of realtime traffic, not considered in previous DWRR method, with serving realtime traffic preferentially by using RR(Round Robin) method which service each channel equally and QLT algorithm that is dynamic time priority method. Proposed cell scheduling algorithm may increase some complexity over conventional DWRR scheme because of delay priority based cell transmission method. However, due to reliable ABR service and congesition avoidance capacity, proposed scheduling algorithm has good performance over conventional DWRR scheme. Also, delay property based cell transmission method in proposed algorithm minimizes cell delay and requires less temporary buffer size

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2000년도 종합학술발표회 논문집 Vol.10 No.1
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• pp.44-48
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• 2000

In this study was modify the PRMA for supporting various types of traffic classes such as CBR, VBR, ABR and UBR. For uplink, we use reservation slots and so the performance will not degrade in case of over load conditions. For downlink broadcasting slots for informing the status of slot reservations are used so the high priority priority terminal can preempt. And we use almost same size buffer as the frame size. So we can dynamically deal with, the traffic changes of VBR terminals. It makes easy for the terminals to reserve supplementary slots. Each terminal is reallocated by the priority of traffic classes and so we can easily select the dropping packets in case of overload conditions. As a result, using our scheme, we can get high channel efficiency and get low packet dropping ratio and delay.

• 한국통신학회논문지
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• 제25권11A호
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• pp.1717-1723
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• 2000

WRR 셀 멀티프렉싱 알고리즘은 CBR, VBR 트래픽 뿐만 아니라 ABR, UBR 트래픽을 서비스하도록 설계되었다. WRR의구현에 있어 버퍼 관리를 효율적으로 하기 위한 BSW 기법의 알고리즘이제안되었다. 그러나, BSW 방식은 VC 에 실제로 할당된 가중치보다 더 큰 가중치를 할당하고 어느 한 VC의 큐가 비어있게 되면 셀 서비스를 수행하지 못하므로 각 VC의 가중치와 스케줄러의 처리율에 심각한 성능저하를 유발한다. 본 논문에서는 위에서 언급한 BSW 기법의 문제를 해결하기 위해서 셀 지연과 버퍼 이용을 개선한 BSW 구조의 WRR 스케줄링 알고리즘을 제안하였다. 제안된 알고리즘은 기존은 BSW 스케쥴링 알고리즘의 문제점들을 해결하기 위해서 각 VC에 실제로 할당된 가중치를 유지할 수 있도록 하였고, 각 VC의 큐가 비어 있을 경우 다른 VC 셀을 서비스하게 함으로서 평균 셀 지연과 평균 버퍼의 길이를 감소시키고 전체적으로 셀 서비스 율을 높일 수 있다.

• 한국통신학회논문지
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• 제25권3B호
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• pp.456-463
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• 2000

Bidirectional cable TV networks using HFC(Hybrid Fiber Coaxial) networks need MAC (Medium access control) protocols to have efficient access in upstream channels. In this paper, we have studied and evaluated several contention resolution algorithms and mapping of higher layer traffic described in IEEE 802.14 and MCNS (Multimedial Cable Network System) MAC protocols with respect to IP, ABR and CBR traffic types. IEEE 802.14 MAC protocol demonstrates better performance for transmitting ATM cells while the MCNS MAC protocols for the IP traffic.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(1)
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• pp.127-130
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• 2000

In this paper, we design the robust H$_{\infty}$ controller for congestion control in ATM (asynchronous transfer mode) networks with the variation of other higher priority sources(e.g., constant bit rate, variable bit rate). Since ABR (available bit rate) sources share the bottleneck node with other higher priority sources, we design the controller which guarantees robustness against time delay and disturbance. The proposed robust H$_{\infty}$ controller with regional pole placements can minimize the variation of the queue size at the predefined desired level. And we also show its robustness through simulation for the ATM networks with time delay and disturbance.

• 동의신경정신과학회지
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• 제12권2호
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• pp.95-102
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• 2001

1. Purpose : The present study was carried out to evaluate the effects of simultaneous treatment with acupuncture, herb medication and non-invasive laser irradiation of blood vessel on the pain control of primary headache. 2. Methods : 30 outpatients who visited in the oriental medical hospital of Kyungsan University from April 10, 2001 to Oct. 10, 2001, based on symptoms and the results of pulse diagnosis, stress test(ABR-2000) and iridology test, were observed on the pain control of primary headache like tension or stress-induced headache. 1)Acupuncture and herbal medicine : Acupuncture treatment and herb medication widely used for headache were carried out simultaneously. 2)Non-invasive laser irradiation : Laser irradiation was undertaken on brachial vein with Lapex-2000 for 30minutes a day for 5 to 15days. 3. Result and Conclusion: In patients with headache, triglyceride mean values decreased from $168.57{\pm}26.90mg/dL$ to $154.23{\pm}28.66mg/dL$ and total cholesterol mean values decreased from $202.23{\pm}22.17mg/dL$ to $194.57{\pm}19.32mg/dL$, after simultaneous treatment with acupuncture, herb medication and non-invasive laser irradiation of blood vessel. And these results suggest that these simultaneous treatment has significant effects in tension and stress-induced headache.: Experiment subjects considered as shown the validity in the headache estimated 80%.

• 대한전자공학회논문지TC
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• 제37권1호
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• pp.12-22
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• 2000

본 논문에서는 트리 구조의 가입자 전달망인 APON(ATM passive optical network)에서 멀티클래스트래픽의 효율적인 전송을 위한 윈도우 기반 허락 분배 기법을 제안하였다. 제안된 기법은 상향 셀들의 다중화를 위한 허락 분배 과정에서 ATM 트래픽 클래스별 전송 특성을 고려함을써 각 트래픽 유형별 QoS를 보장할 수 있도록 설계되었다. 이를 위하여 상향 프레임의 주기적 요구 블록 (RAU)에 트래픽 유형별 요구 필드를 두고, 윈도우 기반 허락 분배 알고리즘을 수행하여 각 트래픽의 특성을 고려한 전송 허락이 이루어지도록 한다. 엄격한 전송 지연 성능을 요구하는 CBR/VBR 트래픽에 대해서는 Running-window 개념을 사용한 최소화할 수 있도록 하고, ABR 트래픽에 대해서는 CBR/VBR 허락 분배 후 여분 대역을 우선적으로 할당함으로써 전송 지연을 줄인다. 또한 대역 할당 후 남은 대역은 UBR 트래픽에게도 예약이 가능하도록 함으로써 망 자원의 이용률을 높일 수 있도록 하였다. 시뮬레이션을 통해 제안된 기법의 성능이 기존 프로토콜에 비해 우수함을 보였다.