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무선 멀티미디어 센서네트워크에서 신뢰성향상을 위한 채널상태기반 경로설정 프로토콜
조병석,이주현,박형근,Cho, Byeong Seok,Lee, Juhyeon,Park, Hyung-Kun 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.2
최근 비디오와 오디오와 같은 멀티미디어 데이터를 전송할 수 있는 무선 멀티 미디어 센서 네트워크의 개발의 필요성이 커지고 있으며, 멀티미디어 데이터의 효율적 전송을 위해서는 QoS의 제공이 중요하다. 애드혹 네트워크 환경에서 널리 사용되는 AODV 라우팅 프로토콜은 소스 노드에서 목적지 노드까지의 홉 수가 가장 적은 경로를 선택하는 알고리즘으로 동작 원리가 단순한 반면, 홉 수 외 다른 것은 고려하지 않기 때문에 QoS 제공에는 적합하지 않다. 본 논문에서는 이러한 점을 보완하기 위해 각 링크의 채널 상태를 고려한 AODV 알고리즘을 제안하고자 한다. 제안하는 알고리즘은 각 링크의 채널 상태를 반영하는 전송 성공률과 이에 따른 재전송 횟수를 계산하여 이를 홉 수에 반영하였다. 제안한 알고리즘은 링크 상태를 홉 수에 반영함으로써 기존의 AODV 알고리즘을 크게 변경시키지 않고 효율적으로 QoS 제공할 수 있다는 장점이 있다. Recently, multimedia data transmission becomes important issues in the wireless sensor network. For the multimedia data transmission in wireless sensor network, QoS (Quality of service) is an important factor to determine the system performance. AODV algorithm is one of the widely used algorithm for wireless ad-hoc environment. In AODV, the destination node selects the route with the smallest hop count. Since AODV only considers the hop count, the selected route could have low channel condition, and degrade QoS. In this paper, we propose a modified AODV algorithm that considers the successful transmission rate of each link. The proposed algorithm regards the number of retransmission which can be obtained from the successful transmission rate as the hop count, and applies the modified hop count to AODV. The advantage of the proposed algorithm is that the modified AODV can support QoS without significant change of the conventional algorithm.
조병석 ( Cho Byong Sok ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
패션 시장은 항상 경쟁이 치열하고 고객의 변화 및 이탈이 심한 시장이다. 경쟁의 요소가 품질 등의 가격적인 요소에서 디자인 및 서비스 등 비 가격 적인 요소의 중요성이 부각되고 있다. 이에 따라 고객 정보에 대한 분석을 기반으로 한 마케팅 및 판매 전략이 중요한 것은 두말할 필요가 없다. 정보 기술과 다양한 분석 기법은 다양한 방법으로 고객의 행동을 분석하여 고객의 구매 형태를 분석 및 예측하여 고객별로 차별화된 마케팅과 서비스를 제공할 수 있도록 한다.
비만 피험자에서 블록앤번의 유효성 및 안전성을 평가하기 위한 위약대조 비교 인체시험
최수영,김남식,조병석,송석길,이종길,이명구,정연복 한국임상약학회 2007 한국임상약학회지 Vol.17 No.2
The purpose of the present study was to evaluate the efficacy and safety of Block and burn®, a 4:1 mixture of Phaseolus vulgaris and Garcinia cambogia extracts, in reducing body weight, as the main outcome measure. Secondary measures of the study were body composition change in overweight human subjects. A randomized, double-blinded, placebocontrolled study was conducted on 52 pre-selected, slightly overweight volunteers, whose weight had been essentially stable for at least 2 weeks, The volunteers were divided into two groups, homogeneous for age, gender, and body weight. The test product (1.2 g) containing Phaseolus vulgaris (200 mg) and Garcinia cambogia (50 mg) and the placebo (1.2 g) were taken 6 tablets per day for 56 consecutive days, respectively. Each subject's body weight, body mass index (BMI), body fat, body fat ratio, and waist hip ratio (WHR) were measured. After 56 days (8 weeks), subjects receiving Block and burn ® had significantly greater reduction of body weight. Moreover, a significant changes of the BMI, body fat, and body fat ratio were observed in the test group compared to placebo. However, WHR was not statistically different between groups. These results indicated that Block and burn® produced significant decrements in body weight and suggested decrements in fat mass in the face of maintained lean body mass.
신대환,최규석,조병석,송석길,문동철,홍진태,이종길,정연복 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.10
A 1:1 mixture of acriflavine (ACF; CAS 8063-24-9) and guanosine is under evaluation in preclinical studies as a possible antitumor agent. Guanosine is known to potentiate the anti-cancer activity of ACF. We therefore investigated the pharmacokinetics of guanosine following administration of the ACF/guanosine mixture in rats. Rats were given guanosine (1 or 5 mg/kg) or ACF/guanosine (2 or 10 mg/kg) by i.v. bolus; or guanosine (3 or 15 mg/kg) or ACF/guanosine (6 or 30 mg/kg) by i.m. injection. We found that guanosine was rapidly cleared from the blood and transferred to tissues after i.m. administration of ACF/guanosine. The mean plasma half-lives (t1/2) at the α and β phases were 0.091 and 6.86 h, or 0.092 and 7.51 h at a dose of 1 or 5 mg/kg guanosine, respectively. ACF had no effect on the plasma disappearance of guanosine following either i.v. bolus or i.m. administration of the combination mixture. Moreover, the ACF combination with guanosine did not significantly alter the values of MRT, Vdss, and CLt of guanosine. Guanosine exhibited linear pharmacokinetics over the dose range from 1 to 5 mg/kg for i.v. doses and 3 to 15 mg/kg for i.m. doses. The bioavailability of guanosine after i.m. administration was 84% for 3 mg/kg dose and 88% for 15 mg/kg dose. ACF had no effects on biliary and urinary excretion of guanosine after i.m. administration. The cumulative amount of guanosine in urine after i.m. administration was about 5-fold larger than that in bile, indicating that guanosine is mostly excreted into the urine. Guanosine was widely distributed in all tissues examined in this study, but was most highly concentrated in the kidney after i.m. administration, followed by slow excretion to bile or urine. ACF had no effect on the tissue distribution of guanosine following i.m. administration. These characterizations of the pharmacokinetics of guanosine after administration of the CF/guanosine combination will be useful in providing preclinical and clinical bases for the potential application of this combination to the treatment of cancer.