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채널 오류가 존재하는 환경에서 IEEE 802.11 무선랜의 경쟁 단말 수 예측 방법
김준석 ( Jun Suk Kim ),최범곤 ( Bum-gon Choi ),정민영 ( Min Young Chung ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.2
IEEE 802.11 DCF(Distributed Coordination Function)의 성능은 채널에 접근하기 위하여 경쟁하는 단말 수에 큰 영향을 받는다. 이에 경쟁하는 단말 수를 예측하기 위하여 많은 방법들이 제안되고 있지만 기존의 방법들은 채널 오류를 고려하지 않고 있다. 따라서 본 논문에서는 기존의 제안된 방법들 중 ARMA(Auto Regressive Moving Average) 필터(Filter)가 적용된 경쟁 단말 수 예측 방법을 수정 및 개선하여 채널 오류를 반영한 단말 수 예측 방법을 제시하였다. 시뮬레이션 결과 제안된 방법은 채널 오류가 존재하는 환경에서 효과적으로 경쟁하는 단말 수를 예측할 수 있음을 확인하였다.
로코코시대의 여성복 실물제작에 대한 고찰 - 재킷을 중심으로 -
김준석(Jun-Suk Kim) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.3
Characteristics of Rococo style costume in patterns are firstly, characteristics of 1735∼1740 s jackets are; front facing covers front body from 11cm down from neck front neck point to center waist; cutting in curve from the position located 4cm and 5cm down from center front/back body waist to side seam; making pleats and flares at yoke side panel; wires inserted at center back body panel which stretch down 6.1cm from front/back yoke center; double cuffs measuring 39.1cm length 32cm opening; turn back cuffs. Secondly, 1760∼1770’s jackets characteristics are round neck connecting the point 15cm down front neck center and the point 6cm toward shoulder point from side neck point; center back body panel and back side body panel are made by cutting back panel from waist line following princess line to the bottom; measurement of body length from waist line are 25.9cm for front and 25cm for back’ 9.7cm and 9.8cm flares are located at center back and princess line; godets are located under dart at waist side line; shoulder length is 26.9cm; wrinkles at back shoulder top and whole 31.3cm sleeve opening; turn back cuffs are 47.8cm length, 20.2cm width and 3 single pleats. Thirdly, 1770∼1785’s jackets characteristics are U shape neckline connecting the point 20cm down from front neck point and the point 5cm toward shoulder point from side neck point; front body length from waist is 58cm; wrap is located at the point 2.5cm to the side and then 15cm downward and then 5.6cm and 1.3cm inward from waistline; single pleats at 5cm from waist center hip line and 10.5cm from bottom; back side line is rolled making quite wide spread pleats to form flare. Characteristics of sleeve are moving side line to back panel and reverse ˄(2.5cm) shape dart at center sleeve opening.
3GPP GERAN CIoT 환경에서 디바이스 Triggering 기반 Reporting 절차 간소화 방안
김준석(Jun Suk Kim),신정완(Jung Wan Shin),정민영(Min Young Chung) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.1
본 논문에서는 네트워크로 데이터를 주기적으로 전송하는 CIoT(Cellular IoT) 디바이스의 에너지 소모를 줄이고, 디바이스의 수명을 증대하기 위한 간소화된 상향링크 전송절차를 제안한다. 제안 방법에서 CIoT 디바이스는 네트워크에 자신의 서비스 및 트래픽 특성을 등록하고, 네트워크는 디바이스가 데이터 전송을 시도할 때마다 고정적으로 무선자원을 할당한다. 본 논문에서는 GSM(Global System for Mobile Communications) 표준의 상향링크 전송절차를 기반으로 한 구체적 절차를 제안하고, 제안 절차에서 수행되는 네트워크 및 디바이스의 동작을 정의한다. 이를 통해 본 연구는 GSM 네트워크에서 높은 에너지 소모 요구사항을 가지는 CIoT 서비스를 지원하는 것에 대한 가능성을 보인다. In this paper, a simplified uplink transmission procedure is proposed for reducing energy consumption and improving lifetime of CIoT devices. In the proposed procedure, the CIoT devices register information on their service and traffic to the networks, and the networks statically allocate pre-defined amounts of radio resources when the CIoT devices have requested permission for their uplink transmissions. This paper provides details of the proposed procedure comparing with those of the current GSM procedure, and defines detailed operations of the devices and the networks for the proposed one. This shows that the proposed scheme can effectively support CIoT services on GSM networks.
김준석(Jun Suk Kim),서홍석(Hong Seog Seo),오동주(Dong Joo Oh),임도선(Do Sun Lim) 대한약학회 1993 약학회지 Vol.37 No.1
Brovincamine is a selective cerebral vasodilator that was apparently produced via a slow calcium blockade. Brovincamine has been shown to increase ATP production and glucose and oxygen consumption in brain, improving energy metabolism. Also brovincamine inhibited platelet aggregation induced by ADP and collagen in vivo and in vitro via an increase of cAMP concentration, promoting therapeutic effects on cerebral circulatory disorders. So we investigated and represented the clinical effects and safety of brovincamine in patients with cerebral stroke. Thirty patients of cerebral stroke that was older than 2 months, who were 22 cases of cerebral infarction, 6 of cerebral embolism that originated from cerebral infarction, 6 of cerebral embolism that originated from cardiac diseases, and 2 of cerebral embolism that originated from cardiac diseases, and 2 of cerebral hemorrhage, were administered of 20 mg of oral brovincamine three times daily for 8 weeks. Improvement rates of each symptom after 8 week administration were 30.8% for subjective symptoms, 76% for psychiatric symptoms and 65.6% for neurologic symptoms. In final global improvement rates, much improvement was 10%, improvement was 23.3% slight improvement is 36.7%, and no change was 30%. So global improvement rate including slight improvement was 70%. As for side effects, there were 3 cases of mild gastrointestinal symptoms, but there were no other subjective side effects and significant fluctuation in laboratory examination. Conclusively throughout the present study, brovincamine is judged to be well tolerated and effective in patients with cerebral stroke.