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무선 센서 네트워크를 위한 임계치 기반 효율적인 혼잡 탐지 및 제어 알고리즘
이대윤(Dae-Woon Lee),이태우(Tae-Woo Lee),최승권(Seung-Kwon Choi),이준석(Joon-Suk Lee),김광훈,이재엽(Jae-Youp Lee) 한국콘텐츠학회 2010 한국콘텐츠학회논문지 Vol.10 No.9
본 연구에서는 불필요한 에너지 소모와 지연을 야기하는 혼잡을 탐지할 수 있는 알고리즘을 제시하고 이에 따라 혼잡 제어를 수행할 수 있는 기법을 제시한다. 기존의 혼잡 탐지는 큐 점유율만을 사용하거나 MAC 계층에서 패킷 도착율만을 가지고 혼잡을 결정하였으나 본 연구에서는 이들 두 가지를 모두 고려하여 더 정밀한 혼잡 탐지를 가능하게 하였다. 또한 혼잡도에 따라 미리 혼잡 회피를 수행하고 혼잡이 발생한 경우 패킷의 우선순위에 따라 지연에 민감한 패킷들을 먼저 스케줄링할 수 있는 방법을 제시하였다. 시뮬레이션 결과 본 논문에서 제안한 혼잡 탐지와 제어 기법은 기존의 혼잡 제어 방법들에 비해 우수한 성능을 보임을 알 수 있었다. This paper reports a new mechanism for congestion controls. The proposed congestion detection algorithm can be provided with delay and unnecessary energy consumption. Conventional congestion control methods decide congestion by queue occupancy or mean packet arrival rate of MAC layer only, however, our method can perform precise detection by considering queue occupancy and mean packet arrival rate. In addition, the congestion avoiding method according to congestion degree and scheduling method using priority for real time packets are proposed. Finally, simulation results show that proposed congestion detection and control methods outperforms conventional scheduling schemes for wireless sensor network.
곡선형 마이크로 채널 내 전기장 영향 하의 입자 거동에 대한 연구
이대웅(Dae Woong Lee),이상엽(Sang Youp Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Dielectrophoresis refers to the behavior of a particle when particles enclosed in a fluid are subjected to an electric field gradient. The magnitude of this dielectrophoresis depends on the magnitude of the electric field gradient, the electrical properties(electrical conductivity, permittivity) of the particles and fluid, the particle size, and the frequency of the alternating current. In this study, the trajectory of particles moving by dielectrophoresis and electrophoresis in curved microchannels filled with fluid under the influence of electric field is analyzed through numerical analysis. By setting the dielectric constant of the particles to 6 kinds and confirming that the trajectory of each particle changes, we confirmed the possibility of particle decomposition in the curved channel.
Dae Hee Kim,Seung-Hee Baek,Hee-young Choi,Dong Gyu Choi,Dong Cheol Lee,Se-Youp Lee,Han Woong Lim,Hyun Taek Lim,Won Yeol Ryu,Hee Kyung Yang,Key Hwan Lim 대한안과학회 2021 Korean Journal of Ophthalmology Vol.35 No.5
The Korean Intermittent Exotropia Multicenter Study (KIEMS), which was initiated by the Korean Association of Pediatric Ophthalmology and Strabismus, is a collaborative multicenter study on intermittent exotropia in Korea. The KIEMS was designed to provide comprehensive information, including subjective and objective findings of intermittent exotropia in a large study population. A total of 65 strabismus specialists in 53 institutions contributed to this study, which, to date, is one of the largest clinical studies on intermittent exotropia. In this article, we provide a detailed methodology of the KIEMS to help future investigations that may use the KIEMS data.
이효구,김대곤,이수택,전기엽,최영숙,서재석 대한소화기학회 1992 대한소화기학회지 Vol.24 No.6
An RNA Virus, named hepatitis C Virus (HCV), has been proposed as an etiological agent for non-A, non-B (NANB) hepatitis, and antibodies directed to HCV (anti-HCV) are detectable by an enzyme-mmuno assay (EIA), and commercial first a'nd second generation assay kits are easily available. And so we planned this study in order to assess the causative role of HCV to the developmnt of the various liver diseases and to compare the prevalence of anti-HCV in Chonbuck province with that of the other areas. To evaluate the prevelence of anti-HCV in the pantieits with HBsAg negative and HBsAg positive liver diseases, we tested 347 sera with first generation of Abbott enzyme immuno assay method (HCV-EIA), and 121 sera samples with second generation of HCV-EIA. Among the total 468 patients, we selected 159 patients to make our goal because their diagnosis were biopsy proven and their anti-HCV were studied 2∼3 times serially. Anti-HCV was detected in fifty-two (11.1%) of 468 patients with various liver disaes, thirty-seven (10.7%) of 347 patients by first generation Kits, fifteen (12.4%) of 121 patients by second generation Kits and nineteen (12.0%) of selected patients. Among the nineteen anti-HCV positive cases, two (2.5%) of 79 patients with acute hepatitis, ten (16.4%) of 61 patients with chronic hepatitis, four (25%) of 16 patients with liver cirrhosis and one (33.3%) of 3 patients with hepatocellular carcinoma were positive for anti-HCV. Eleven (0.22%) of 4950 blood donors of the Chon Buck Red Cross Blood Center During the May, 1991, showed anti-HCV positivity. Ten 1:10 dilutions of 10 anti-HCV positive blood donor sera showed anti-HCV negative and ten 1:100 dilutions of 10 HBsAg positive blood donor sera showed HBsAg positive. Our data show that the prevalence of anti-HCV in Chon Buck area is low in patients with NANB acute and chronic hepatitis than that of other report. And the prevalence of anti-HCV in patients with NANB liver cirrhosis and hepatocellular carcinoma is similar to the other reports. The low concentration of the circulating antibody than the regional difference of C hepatitis viral antigen may be one of the reasons of it.