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Hwang, Chi-Young,Kim, Gi Heon,Yang, Jong-Heon,Hwang, Chi-Sun,Cho, Seong M.,Lee, Won-Jae,Pi, Jae-Eun,Choi, Ji Hun,Choi, Kyunghee,Kim, Hee-Ok,Lee, Seung-Yeol,Kim, Yong-Hae The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.47
<P>Correction for ‘Rewritable full-color computer-generated holograms based on color-selective diffractive optical components including phase-change materials’ by Chi-Young Hwang <I>et al.</I>, <I>Nanoscale</I>, 2018, DOI: 10.1039/c8nr04471f.</P>
P2P 캐싱을 기반으로 한 효율적인 브로드캐스트 스트리밍 기법
이치훈,계이기,정인범,최창열,최황규 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-
Video-on-Demand is undoubtedly a promising technology for many important applications. Several periodic broadcast techniques have been proposed for the cost-effective implementation of such systems. However, there is a server delay for all of them. To address the shortcoming, we present a new scheme improving the staggered broadcasting by jointly using prefix caching scheme of VOD system in P2P environments. In thins paper, each client plays a role in the first segment staggered broadcasting server to serve the prefix stream to other clients that request the same video stream. The buffer can be empty after the client has served the following client. As a result, we are able to achieve no service latency time and the low buffer space.
진도훈,우태수,이치우 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
This paper dealt with FMEA, which is a method of the analysis to secure safety and confidence coming up to customers' expectation in consideration of the environment of the corporation, the industrial environment, and the functional improvement. And by using FMEA, We showed the example analyzed the confidence of the Air Supply System. It was proved by the result of the analysis that the rate of the breakdown which is usually regarded as the first important point to reform can't satisfy the selecting basis to improve. Also the result said that it is not right to depend on only the rate of the failure in making the list of the reform. Through the analysis of the breakdown, FMEA can present the important factors of the reform to improve the confidence of the system. In this study would show the important factors of the improvement in order to product the goods guaranteed confidence through the method of FMEA.
박용관,박치영,조은택,조기섭,박찬국,송창훈,이미자,기근홍 朝鮮大學校 附設 醫學硏究所 1995 The Medical Journal of Chosun University Vol.20 No.2
Hepatocellular carcinoma frequently metastasizes through direct extension, lymphatic, and hematogenous routes. The most common sites of metastasis are the lungs and the lymph nodes, glands, bones, spleen, kidneys, colon, and pleura are the sites of metastasis in decreasing order of frequency. But metastasis to the ovary is very rare. It is thought that metastasize to the ovary occurs through infiltration or dissemination. However, we observed ovarian metastasis of primary hepatic tumor in a 34-year old female who suffered from lower abdominal pain. At first, it was diagnosed as a primary ovarian tumor. But histologically, it presented sinusoidal pattern surrounded by the tumor cells and contained rounded by the tumor cells and contained round hyaline globules in minority of the cytoplasm. Then, the histologic features of percutaneous, sono-guided liver biopsy speecimen of the liver mass are similar to those of resected ovarian tissues. Therefore, we concluded that ovarian tumor was originated from hepatocellular carcinoma. In summary, this report examines a case of hepatocellular carcinoma with ovarian metastasis in a female and reviews the literature.
[논문]스트렷-타이 모델에 의한 사각형 단면 코벨의 설계 기법
김대성,김태완,이승훈,엄장섭,진치섭 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-
콘크리트 코벨은 D-영역을 갖는 대표적인 구조물로서 복잡하고 다양한 형상의 파괴메커니즘을 보인다. 이는 응력집중과 기하학적인 불연속으로 일반적인 보 이론의 적용이 불가능하여 해석 및 설계에 어려움이 많다. 본 연구에서는 지압파괴,압축파괴 및 전단파괴를 유발하는 복잡한 파괴메커니즘을 형성하고 있는 사각형 단면 코벨의 거동 및 파괴형상을 예측하고 스트릿-타이 모텔을 적용하여 해석 및 설계를 하였다. 또한 현행의 설계방법과의 비교를 통하여 스트렷-타이 모델이 보다 합리적이고 경제적인 설계방법임을 보였다.
강대웅,정지용,윤나라,안치용,김종오,신병철,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Background: Some cases of QT interval, corrected QT interval (QTc), QT dispersion (QTd) and corrected QT dispersion (QTcd) have been reported in ESRD, but these results are variable and the influence of a hemodialysis is still controversial, In this study, we investigated the effect of hemodialysis on QT and QTc interval and QT and QTc dispersion in patients with ESRD 15 min before and 15 minute after each hemodialysis. Methods: Sixty-seven patients with ESRD (men 33 & women 34) on three-times stable hemodialysis (>3 months) were randomly enrolled. Fifty control subjects with a similar age and normal renal function were enrolled from this hospital. Routine biochemical studies were measured pre- and post dialysis, at the time of the ECG. Plasma Na+, K+, BUN, creatinine, ionized calcium and phosphate were checked. Twelve-lead electrocardiographs were performed at 10㎜/mv and 50㎜/s using a HewIett-Packard Pagewriter 100, before and after a single hemodialysis session.The QT interval was measured from the onset of the QRS complex to the end of the T wave. If the end of the T wave was not clear in a particular lead then it was excluded from analysis. When U waves were present, the end of the T wave was taken as the nadir between the T and U waves. Each QT interval was corrected for heart rate using Bazett's formula (QTc==QT/√(RR)) (ms). The difference between maximal and minimal QT interval duration was defined as QT dispersion (QTd) in each of the 12 leads. Result: This study demonstrates that QT, QTd, QTcd is higher in hemodialysis patients compared with control subjects, and QT and QTd rise postdialysis to levels comparable to those seen acutely following myocardial infarction, when patients are at greatly increased risk of potentially fatal ventricular arrhythmias, Conclusions: QT interval and QT dispersion, markers of risk for arrhythmias and sudden death, are elevated in hemodialysis patients, and rise postdialysis. QT interval and QT dispersion is an easily obtainable, noninvasive, simple, inexpensive, and widely available method of risk stratification in uremic patients receiving chronic dialysis. Additional studies are needed to clarity whether increased postdialysis QT dispersion results in an increased occurrence of arrhythmias.
Chi-hun Lee,Heon-seock Cynn,A-reum Shin,Seung-min Baik,Woochol Joseph Choi,Ji-hyun Lee 한국신경근육물리치료학회(구 한국신경근육재활학회) 2023 한국신경근육재활학회지 Vol.13 No.3
Excessive activity of the upper trapezius (UT) muscle contributes to a rounded shoulder posture (RSP) through abnormal rotation of the scapula that weakens the lower trapezius (LT) and serratus anterior (SA) muscles. This study compared the effects of knee push-up plus (KPP) exercise and KPP with isometric shoulder extension (KPPISE) exercise on the activities of LT, SA, and UT, and lower trapezius/upper trapezius (LT/UT) and serratus anterior/upper trapezius (SA/UT) activity ratios in subjects with RSP. Twenty subjects with RSP performed KPP and KPPISE. Electromyography was used to examine the muscle activity and a caliper, to measure the RSP. The paired t-test was used to compare the effect of KPP and KPPISE exercises on LT, SA, and UT activities, as well as LT/UT and SA/UT activity ratios in subjects with RSP. The LT and SA muscle activities significantly increased during KPPISE exercises than during KPP exercise (p=.004, p=.001; respectively). In contrast, the UT muscle activity significantly decreased during KPPISE exercise than after KPP exercise (p=.001). The LT/UT and SA/UT activity ratios increased significantly during KPPISE exercise than during KPP exercise (both p=.001). The KPPISE exercise may be an effective way to increase the LT and SA activity while reducing UT activity in subjects with the RSP.
Abnormal Chloroplast Development and Growth Inhibition in Rice Thioredoxin m Knock-Down Plants.
Chi, Yong Hun,Moon, Jeong Chan,Park, Jin Ho,Kim, Ho-Seung,Zulfugarov, Ismayil S,Fanata, Wahyu Indra,Jang, Ho Hee,Lee, Jung Ro,Lee, Young Mee,Kim, Sun Tae,Chung, Yong-Yoon,Lim, Chae Oh,Kim, Jae-Yean,Yu American Society of Plant Physiologists 2008 Plant Physiology Vol.148 No.2
<P>Plant cells contain several thioredoxin isoforms that are characterized by subcellular localization and substrate specificity. Here, we describe the functional characterization of a rice (Oryza sativa) thioredoxin m isoform (Ostrxm) using a reverse genetics technique. Ostrxm showed green tissue-specific and light-responsive mRNA expression. Ostrxm was localized in chloroplasts of rice mesophyll cells, and the recombinant protein showed dithiothreitol-dependent insulin beta-chain reduction activity in vitro. RNA interference (RNAi) of Ostrxm resulted in rice plants with developmental defects, including semidwarfism, pale-green leaves, abnormal chloroplast structure, and reduced carotenoid and chlorophyll content. Ostrxm RNAi plants showed remarkably decreased F(v)/F(m) values under high irradiance conditions (1,000 mumol m(-2) s(-1)) with delayed recovery. Two-dimensional electrophoresis and matrix-assisted laser-desorption/ionization time-of-flight analysis showed that the levels of several chloroplast proteins critical for photosynthesis and biogenesis were significantly decreased in Ostrxm RNAi plants. Furthermore, 2-Cys peroxiredoxin, a known target of thioredoxin, was present in oxidized forms, and hydrogen peroxide levels were increased in Ostrxm RNAi plants. The pleiotropic effects of Ostrxm RNAi suggest that Ostrxm plays an important role in the redox regulation of chloroplast target proteins involved in diverse physiological functions.</P>
Region Defense Technique Using Multiple Satellite Navigation Spoofing Signals
Chi-Hun Lee,Seungho Choi,Young-Joong Lee,Sang Jeong Lee 항법시스템학회 2022 Journal of Positioning, Navigation, and Timing Vol.11 No.3
The satellite navigation deception technology disturbs the navigation solution of the receiver by generating a deceptive signal simulating the actual satellite for the satellite navigation receiver mounted on the unmanned aerial vehicle, which is the target of deception. A single spoofing technique that creates a single deceptive position and velocity can be divided into a synchronized spoofing signal that matches the code delay, Doppler frequency, and navigation message with the real satellite and an unsynchronized spoofing signal that does not match. In order to generate a signal synchronized with a satellite signal, a very sophisticated and high precision signal generation technology is required. In addition, the current position and speed of the UAV equipped with the receiver must be accurately detected in real time. Considering the detection accuracy of the current radar technology that detects small UAVs, it is difficult to detect UAVs with an accuracy of less than one chip. In this paper, we assume the asynchrony of a single spoofing signal and propose a region defense technique using multiple spoofing signals.