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ATM 망에서 우선순위 제어 및 실시간 처리가 가능한 호 수락 제어
이혁진,오민웅,박광채 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
When a new call requests a call set-up, call admission control determines whether to accept a call set-up or not, in order to maintain the QOS of existing and new calls. In this paper, the VP bandwidth is separated to eliminate interference between traffics. We can class CBR and VBR traffic and fulfill call admission control applied to each traffic. The call admission control method of CBR traffic is peak bandwidth allocation and that of VBR traffic is performed to guarantee QOS. Proposed method is suitable for real time processing because the amount of calculation is reduced remarkably by using recursive equations in estimating cell loss probability. Also, proposed method can be applied to prioity control.
박광채,이혁진,서순석 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.2
One of the challenges in the interconnection of LAN and MAN to ATM is the support of connectionless traffic in the ATM network. A commonly proposed strategy consists of maintaining a low bandwidth VP(virtual path) between each pair of gateway and of requesting more bandwidth whenever a burst comes in from the LAN or MAN. Unfortunately this stratege places a heavy burden on the ATM control processor. Therefore we proposed BA(Bandwidth Advertising) scheme, which know available bandwidth and On-the-fly transmission, which transfer bursts without prior bandwidth reservation. The BA scheme and On-the-fly transmission for connectionless traffic is described and is compared with a bandwidth renegotiation strategy.
분산공유 메모리 시스템을 위한 동적 제한 디렉터리 기법
이동광(Lee Dong Kwang),권혁성(Kweon Hyek Seong),최성민(Choi Seong Min),안병철(Ahn Byoung Chul) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.4
The caches in distributed shared memory systems enhance the performance by reducing memory access latency and communication overhead, but they must solve the cache coherence problem. This paper proposes a new directory protocol to solve the cache coherence problem and to improve the system performance in distributed shared memory systems. To maintain the cache coherence of shared data, processors within a limited distance reduce the communication overhead by using a bit-vector like the full directory scheme. Processors over a limited distance store pointers in a directory pool. Since the bit-vector and the directory pool remove the unnecessary cache invalidations, the proposed scheme reduces the communication traffic and improves the system performance. The dynamic limited directory scheme reduces the communication traffic up to 66 percents compared with the limited directory scheme and the number of directory access up to 27 percents compared with the dynamic pointer allocation scheme.
Physiological Activities of Ginsenoside-rich Fraction Isolated from Panax ginseng Leaves
Seong Yeong Kim,Sang Hyek Kim,Kwang-Soon Shin,Ho Lee 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.3
In order to develop the new physiologically active materials from the leaves of Panax ginseng C.A. Meyer, the ginsenoside-rich fraction (GL-1) was isolated from ginseng leaves and physiological activities were examined. GL-1 contained crude saponin (ginsenosides,58.00%) and component ginsenoside analysis using high performance liquid chromatography (HPLC) showed that the major ginsenosides of GL-1 were Re, Rg1, Rc, and F2and their contents were 34.42, 20.73, 18.42, and 8.60%,respectively. ABTS and DPPH radical scavenging activities of GL-1 were 75.14 and 39.28% at 10,000 μg/mL,respectively. Superoxide anion radical scavenging activity was 70.94% at 1,000 μg/mL. GL-1 also expressed the considerable anti-complementary activity in dose-dependent manner. Results obtained by crossed immunoelectrophoresis using anti-human C3 and anti-complementary activity in the absence of Ca++ ion suggested that complement activation by GL-1 from ginseng leaves occur via both alternative and classical pathways.
축출 우선순위 트래픽 제어 메카니즘의 성능 분석에 관한 연구
이수영,이혁진,오민웅,박광채 조선대학교 동력자원연구소 1994 動力資源硏究所誌 Vol.16 No.2
본 논문에서는 다중의 우선순위를 지원하는 통신망에 확장시켜 적용할 수 있는 Markov chain을 이용한 축출 우선순위 트래픽 제어 메카니즘의 해석방법을 제안하였다. 제안한 해석방법을 전체 버퍼의 크기, 트래픽 세기, 우선순위 트래픽의 혼합비 등을 가변하면서 두개의 우선순위를 지원하는 ATM 망에 적용한 결과 트래픽 세기가 0.5∼0.8일 때 전체 버퍼의 크기가 25정도이면 서비스 품질을 만족하였다. 그러나 다중 우선순위 제어에서는 할당된 우선순위의 수와 우선순위 트래픽의 혼합비 등이 손실에 많은 영향을 미친다는 것을 알 수 있었다. 또한 기존의 해석방법에 비하여 간단하면서도, 비교적 정확한 결과를 얻었으며 임의의 우선순위를 지원하는 통신망에 신축성있게 적용할 수 있음을 알았다. 제안한 해석방법은 시뮬레이션 전용언어인 SIMSCRIPT II.5로 시뮬레이션을 수행하여 결과의 타당성을 강조하였다. In this paper, we propose the analysis method of extended push-out priority traffic control mechanism which can be applied to the network supporting multiple priorities, using Markov chain. When proposed analysis methods are applied to ATM networks with two priorities as varying buffer size, traffic intensity and mixing ratio of priority traffics, as a result, it satifies the quality of service when the buffer size is 25 in traffic intensity 0.5∼0.8. But, in the case of multiple priority control mechanism, the number of assigned priorities and the mixing ratio of traffic affect the loss probability. Also we get very simple and more exact results compared with conventional analysis method and know that the proposed analysis method is flexibly applied to the network with multiple priorities. To verify the proposed analysis method, we perform the simulation using the SIMSCRIPT II.5 simulation package.
조백현,이삼용,최광림,김대영,이장혁 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.4
This retrospective clinical study includes 98 cases of facial skin cancers, which were managed in Chonnam University Hospital from 1986 to 1995 with histopathologic confirmation. 1. Of all cases, basal cell carcinoma was the most common type(74.5%), and squamous cell carcinoma(20.4%), malignant melanoma(2.0%), eccrine carcinoma(1.0%), rhabdomyosarcoma(1.0%), metastatic leiomyosarcoma(1.0%) were followed. The ratio of basal cell carcinoma to squamous cell carcinoma was 3.7:1. 2. In age and sex distribution, majority of facial skin cancers developed after 6th decade(83.7%). In basal cell carcinoma, female was more frequently affected than male and the ratio was 1:1.7. 3. The predilection site of basal cell carcinoman were lower eyelid, nose, cheek, and those of squamous cell carcinoma were lower lip, cheek and lower eyelid. 4. Of the reconstructive methods after tumor resection, local flaps were most commonly used(60.9%), and primary closure was possible only in 18.4% of all cases. 5. The duration between the presumed time of onset and the time of operation was between 6 months and two years in 76.0% of all cases, with an average of 3.2 years.