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H.264/AVC 무손실 화면내 부호화를 위한 향상된 CABAC
허진,호요성 에스케이텔레콤 (주) 2011 Telecommunications Review Vol.21 No.3
H.264/AVC 비디오 압축 표준에서 엔트로피 부호화 방법의 하나인 문맥 기반 적응적 이진 산술 부호화(CABAC:Context-based Adaptive Binary Arithmetic Coding)는 손실(lossy) 압축 부호화 환경에 적합하게 설계됐다. 또한H.264/AVC 고급 프로파일(Advanced 4:4:4)에서 지원하는 비 변환 무손실 모드(transform-bypass lossless mode)의 경우 손실 부호화를 기반으로 설계된 CABAC을 무손실(lossless) 부호화에서 그대로 사용하므로 최적의 부호화 성능을 제공하지 못한다. 본 논문에서는 H.264/AVC의 손실 부호화와 무손실 부호화 환경에서 잔여신호의 통계적 특성에 분명한 차이가 있음을 확인하고 무손실 화면내 부호화 환경에서 잔여신호의 통계적 특성을 고려하여 향상된CABAC 기반의 잔여신호 부호화 방법을 제안한다. 실험 결과로부터 무손실 화면내 부호화 환경에서 본 논문에서 제안하는 향상된 CABAC 방법이 기존의 CABAC 방법에 비해 평균적으로 약 19% 정도의 비트수를 감소시키는 것을 확인했다.
대학 교양프랑스어 수강생들의 에니어그램 성격유형에 따른 프랑스어 학습전략모델 연구
허진,김선미 서강대학교 언어정보연구소 2014 언어와 정보 사회 Vol.22 No.-
This article explores the French learning strategies models of students who take an introductory course in French. To understand much better the their characteristics, we use Enneagram personality types and compare two models : collective learning model conducted in the first semester of 2013 and individual learning model in the second. We find that it’s possible to constitute an ideal group with two enneatypes 2 and 7 who are learning French through the groups activities. The group composed exclusively of enneatypes 4, 5 and 9, their activity showed significantly a depressing state. On the other hand, in the individual learning model, it was effective for enneatypes 4 and 5 in particular: they did a positive interplay with their teacher and accomplished excellent achievements, while not representing the prominence in collective learning model. When viewed, through these learning strategies models appropriate to the Enneagrampersonality types, we can clearly see that it exists.
전류원 급전-변압기 공진형 자기유도 전력전달시스템 특성연구
허진,이우영,조정구,조규형,임춘택 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
일반도로에서 자유주행이 가능한 온라인 전기자동차 (On-Line Electric Vehicle, OLEV)에 적용하기 위해 전류원 급전방식의 직렬-직렬 공진형 자기유도 전력전달시스템 (Inductive Power Transfer System, IPTS)을 개발하였다. OLEV용 IPTS에서는 급전선로의 누설 인덕턴스가 크고 집전픽업의 유무에 따라 입력측에 유기되는 전압변동이 심한 특성을 반영하여 급전측에 공진형 전류원을 사용한다. 또한 자화 인덕턴스와 집전픽업의 누설 인덕턴스를 포함하여 변압기를 완전 공진시킨다. 본 논문에서는 이러한 방식의 IPTS에서 최대출력을 전달하기 위한 조건을 찾고, 이로써 최대 출력전류 및 출력전력을 제한하는 요인을 찾아 최적설계를 할 수 있도록 하였다. 또한 실험을 통해 그 타당성을 검증하였다.
Antispasmodic Effects of Junsibaekchul-San In Vivo and In vitro
허진일,변준석,김대준 한의병리학회 2010 동의생리병리학회지 Vol.24 No.1
In Vivo and In vitro antispasmodic effects of Jun-Si-Baek-Chul-San, a Traditional Korean Polyherbal Medicineconsisted of 7 types of herbs were observed in the present study. To clarify the effects of Jun-Si-Baek-Chul-San, on accelerating small intestinal movement induced by the stimulation of cholinergic neurotransmission, we evaluated the effects of Jun-Si-Baek-Chul-San on In vivo carbachol (an acetylcholinergic agent)-accelerated mice small intestinal transit and on In vitro contractions induced by low-frequency electrostimulation, KCl, histamine or acetylcholine using isolated guinea pig ileum. To induce the acceleration of mice small intestinal transit, Carbachol 1 mg/kg was once subcutaneously dosed 15min before last administration of the test drugs. In the present study, Jun-Si-Baek-Chul-San 500, 250 and 125 mg/kg or domperidone 20 mg/kg were orally pretreated on the carbachol-accelerated mice small intestinal transit once a day for 7 days and the small intestinal transit rateof activated charcoal powder were monitored. In vitro assays, Jun-Si-Baek-Chul-San1, 0.1, 0.01 and 0.001 mg/ml or domperidone 2×10-5M were treated 10min before ileal contraction was induced by filed stimulation, acetylcholine, KCl and histamine, and the % changes of contractions were observed compared to the treatment of inducer alone. In spontaneous contraction, the % changes of contractions were observed compared to treatment of vehicle alone at 10min after Jun-Si-Baek-Chul-San or domperidone treatment. The efficacy of Jun-Si-Baek-Chul-San was compared to those of domperidone. High concentration, 1 mg/ml of Jun-Si-Baek-Chul-San was found to decrease the spontaneous contraction of the isolated guinea-pig ileum. In addition, Jun-Si-Baek-Chul-San decrease contractions induced by electrostimulation, acetylcholine, histamine and KCl in the isolated guinea-pig ileum. In addition, Jun-Si-Baek-Chul-San effectively inhibited the accelerated small intestinal movement induced by carbachol stimulation of cholinergic neurotransmission in In vivo. Based on the results, although the exact molecular or action mechanism and which herbs or compound in Jun-Si-Baek-Chul-San are responsible for actions, it was concluded that Jun-Si-Baek-Chul-San normalization in the accelerated intestinal motility might be interfere with a variety of muscarinic, adrenergic and histaminic receptor activities or with the mobilization of calcium ions required for smooth muscle contraction non-specificly. Therefore, it is expected that Jun-Si-Baek-Chul-San will be promising as a prescription of clinical treatment of digestive tract disorders such as accelerated the motility of intestine, diarrhea or intestinal painful contractions.