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Striping and Scheduling for Large Scale Multimedia Servers

Journal of Computer Science & Technology 2004年第6期19卷 885-895页

作者： kyung-ohlee jun-hopark yoon-youngpark DepartmentofComputerScience SunmoonUniversity100TangJeonMyunKalsanRiAsansiChunNam336-840Korea

When designing a multimedia server, several things must be decided: which scheduling scheme to adopt, how to allocate multimedia objects on storage devices, and the round length with which the streams will be serviced. Several problems in the designing of large-scale multimedia servers are addressed, with the following contributions: (1) a striping scheme is proposed that minimizes the number of seeks and hence maximizes the performance; (2) a simple and efficient mechanism is presented to find the optimal striping unit size as well as the optimal round length, which exploits both the characteristics of VBR streams and the situation of resources in the system; and (3) the characteristics and resource requirements of several scheduling schemes are investigated in order to obtain a clear indication as to which scheme shows the best performance in realtime multimedia servicing. Based on our analysis and experimental results, the CSCAN scheme outperforms the other schemes. It is believed that the results are of value in the design of effective large-scale multimedia servers. Keywords realtime multimedia - storage server - scheduling - data placement - buffer management - variable bit rate This work was supported in part by the University IT Research Center Project and Sunmoon University Research Project.kyung-Oh Lee is an associate professor in the Faculty of Computer and Information Sciences, Sunmoon University, Korea. He received his B.S., M.S. and Ph.D. degrees in computer science from Seoul National University in 1989, 1994 and 1999, respectively. His current research interests include multimedia system, database, mobile communication. He is a member of KIPS (Korea Information Processing Society).jungho-Ho Park is a professor in the Divisions of Computer and Information Sciences, Sunmoon University, Korea. He received his M.S. and Ph.D. degrees in computer science from Osaka University in 1987 and 1990, respectively. His current research interests include d

关键词： realtime multimedia storage server scheduling data placement buffer management variable bit rate

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大规模多媒体服务器的分带和调度

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Journal of Computer Science & Technology 2004年第C期19卷 89-89页

作者： kyung-ohlee jun-hopark yoon-youngpark Dept.ofComputerScience SunmconUniversity100TangJeonMyunKalsanRiAsansiChun-Nam336-840Korea

由于多媒体对象的尺寸较大及实时传输的要求，多媒体服务器通常是建立在磁盘阵列之上的，为了有效的利用磁盘阵列以便能同时提供尽可能多的服务，一个多媒体对象要交叉存储到阵列中不同的磁盘上。当设计一个大规模多媒体服务器时，需要... 详细信息

由于多媒体对象的尺寸较大及实时传输的要求，多媒体服务器通常是建立在磁盘阵列之上的，为了有效的利用磁盘阵列以便能同时提供尽可能多的服务，一个多媒体对象要交叉存储到阵列中不同的磁盘上。当设计一个大规模多媒体服务器时，需要确定以下几个问题：采用何种调度策略，怎样在存储设备上分配多媒体对象，多媒体码流的循环长度(round length)为多大等。本文的主要贡献如下：

关键词：多媒体对象多媒体服务器磁盘阵列大规模存储设备调度策略实时传输码流尺寸长度

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Optimal biliary drainage for inoperable Klatskin's tumor based on Bismuth type

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World Journal of Gastroenterology 2007年第29期13卷 3948-3955页

作者： Sang Hyub Lee Joo kyung Park Won Jae yoon jun Kyu Lee Ji Kon Ryu Yong Bum yoon Yong-Tae Kim Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine Seoul South Korea

AIM： To investigate differences in the effects of biliary drainage procedures in patients with inoperable Klatskin＇s tumor based on Bismuth type, considering endoscopic retrograde biliary drainage （ERBD）, external percutaneous transhepatic biliary drainage （EPTBD） and internal biliary stenting via the PTBD tract （IPTBD）. METHODS： The initial success rate, cumulative patency rate, and complication rate were compared retrospectively, according to the Bismuth type and ERBD, EPTBD, and IPTBD. Patency was defined as the duration for adequate initial bile drainage or to the point of the patient＇s death associated with inadequate drainage. RESULTS： One hundred thirty-four patients （93 men, 41 women; 21 Bismuth type Ⅱ, 47Ⅲ, 66 Ⅳ; 34 ERBD, 66 EPTBD, 34 IPTBD） were recruited. There were no differences in demographics among the groups. Adequate initial relief of jaundice was achieved in 91% of patients without a significant difference in the results among different procedures or Bismuth types. The cumulative patency rates for ERBD and IPTBD were better than those for EPTBD with Bismuth type Ⅲ. IPTBD provided an excellent response for Bismuth type IV. However, there was no difference in the patency rate among drainage procedures for Bismuth type Ⅱ. Procedure-related cholangitis occurred less frequently with EPTBD than with ERBD and IPTBD. CONCLUSION： ERBD is recommended as the firstline drainage procedure for the palliation of jaundice in patients with inoperable Klatskin＇s tumor of Bismuth type Ⅱ or Ⅲ, but IPTBD is the best option for Bismuth type Ⅳ.

关键词： Klatskin's tumor Palliation Drainage Bile ducts Intervention

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Successful recanalization of chronic total occlusion of the superior mesenteric artery by transradial approach

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第8期11卷 627-630页

作者： Woo Taek KIM Sung Gyun AHN jun-Won LEE Joong kyung SUNG Seung Hwan LEE junghan yoon Division of Cardiology Wonju College of MedicineYonsei University

It is a challenge to confirm chronic mesenteric ischemia(CMI) as a cause of gastrointestinal(GI) symptoms such as postprandial epigastric bloating,anorexia,and debilitating weight *** intervention for CMI has been gaining popularity because of the high morbidity associated with surgical ***,in EVI for superior mesenteric artery(SMA) occlusion,the transfemoral approach is limited by difficulty in coaxial alignment of the guiding catheter,which leads to insufficient back-up ***,we report on a 58-year-old male patient with chronic total occlusion of the SMA,which was successfully revascularized by endovascular intervention via the left radial *** endovascular therapy may be another treatment option for the treatment of CMI.

关键词： Transluminal angioplasty Radial artery Superior mesenteric artery Chronic mesenteric ischemia

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Comparison of the meibomian gland dysfunction in patients with chronic ocular graft-versus-host disease and Sjogren's syndrome

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 393-400页

作者： Won Choi jun Young Ha Ying Li jung Han Choi Yong Sok Ji kyung Chul yoon Department of Ophthalmology and Research Institute of Medical Sciences Chonnam National University Medical School and Hospital

AIM: To investigate the abnormalities in the meibomian gland in patients with dry eye disease(DED) associated with chronic ocular graft-versus-host disease(coGVHD) in comparison with Sj?gren's syndrome(SS), a major form of aqueous deficient DED and meibomian gland dysfunction(MGD), a common cause of evaporative ***: A total 135 eyes of 135 subjects included in this study: patients with DED associated with coGVHD(n=30), patients with SS(n=35), patients with MGD(n=35), and normal controls(n=35). All participants completed the Ocular Surface Disease Index(OSDI) questionnaire, ocular surface examination [Schirmer test, tear film breakup time(TFBUT), and ocular surface staining], and meibomian gland assessment [meiboscore(gland dropout detected on meibography using infrared camera of the Keratograph 5 M), meibum expressibility score(MES), meibum quality score(MQS), lid margin abnormality]. In addition, correlations of meibomian gland characteristics with ocular surface parameters as well as disease severity score were investigated in coGVHD ***: The coGVHD group showed significantly higher meiboscore, MES, and MQS than the other 3 groups(all P<0.05). In the coGVHD group, parameters of meibomian gland showed a significant correlation each other and those of ocular surface. The correlation between meibomian gland parameters and severity score of co GVHD was also established(meiboscore, r=0.62; MES, r=0.47; MQS, r=0.47; lid margin abnormality score, r=0.55; all P<0.05).CONCLUSION: Patients with DED associated with co GVHD show poorer gland morphology and worse glandfunction than other types of DED. In addition, meibomian gland damage is not only associated with ocular surface damage but also disease severity of coGVHD.

关键词： chronic ocular graft-versus-host disease Sjogren's syndrome dry eye disease meibomian gland dysfunction meibography

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Recent progress in quasi-two-dimensional and quantum dot perovskite light-emitting diodes harnessing the diverse effects of ligands:A review

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Nano Research 2022年第7期15卷 6449-6465页

作者： Yurim Bae jun Ryu Saemon yoon Dong-Won Kang School of Energy Systems Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Smart City Chung-Ang UniversitySeoul 06974Republic of Korea

Halide perovskites have been extensively studied for use as light-emitting diodes(LEDs)in next-generation displays due to their beneficial characteristics,including their high color purity and wide color *** perovskites can be categorized into four representative structures:three-dimensional(3D)bulk,two-dimensional(2D),quasi-two-dimensional(quasi-2D),and quantum dot(QD).Recently,excellent advances in the performance of perovskite LEDs(PeLEDs),especially those with quasi-2D and QD architectures,have been demonstrated with the incorporation of organic chain *** can both modify the structure of PeLEDs,such as forming multi-quantum wells in quasi-2D PeLEDs and essential passivation layers in QD PeLEDs,and also enhance their optical *** appropriate use of ligands in PeLEDs can thus lead to greater luminescence,current efficiency,power efficiency,and external quantum *** this review,the principal roles of ligands in quasi-2D and QD PeLEDs are systematically ***,current limitations and future perspectives are discussed in detail.

关键词： perovskites light emitting diode ligands quasi-two-dimensional(quasi-2D) quantum dot

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Phase separations in graded-indium content InGaN/GaN multiple quantum wells and its function to high quantum efficiency

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Journal of Semiconductors 2012年第5期33卷 13-16页

作者：郭洪英孙元平 Yong-Hoon Cho Eun-kyung Suh Hai-Joon Lee Rak-jun Choi yoon-Bong Hahn Institute of Science and Technology for Opto-Electronic Information Yantai University Department of Physics Korea Advanced Institute of Science and Technology School of Semiconductor and Chemical Engineering Semiconductor Physics Research CenterChonbuk National University School of Chemical Engineering Chonbuk National University

Phase separations have been studied for graded-indium content In_xGa_（1-x）N/GaN multiple quantum wells（MQWs） with different indium contents by means of photoluminescence（PL）,cathodeluminescence（CL） and time-resolved PL（TRPL） *** the main emission peaks,all samples show another 2 peaks at the high and low energy parts of the main peaks in PL when excited at 10 *** images show a clear contrast for 3 samples,which indicates an increasing phase separation with increasing indium *** spectra at 15 K of the main emissions show an increasing delay of rising time with indium content,which means a carrier transferring from low indium content structures to high indium content structures.

关键词： carrier transfer phase separation graded-indium content multiple quantum wells

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Hepatitis B viral load affects prognosis of hepatocellular carcinoma

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World Journal of Gastroenterology 2014年第34期20卷 12039-12044页

作者： Su Jong Yu yoon jun Kim Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoul 110-744South Korea

Hepatocellular carcinoma(HCC)is a complex disease that is dually challenging to treat due to underlying chronic liver disease in addition to the cancer *** prognosis of patients with HCC is determined by intrahepatic tumor status and reserved hepatic *** B virus(HBV)is an established major risk factor of HCC development,and HBV viral load is being increasingly recognized as a prognostic factor in the presence of established *** HBV viral load may affect the prognosis of HBV-related HCC patients in several ***,it is associated with more frequent recurrence of HBV-related HCC after ***,it is associated with more occurrence and severity of potentially life-threatening HBV ***,it is associated with more worsened liver function,which limits the therapeutic options for HBV-related ***,directly or indirectly,can induce *** patients with a high HBV DNA level and subsequent active hepatitis,adhesion molecules expressed on the sinusoidal cells are up-regulated and may increase intrahepatic *** progression after treatment can lead to a poor prognosis by reducing number of normal functioning ***,high HBV viral load can affect the prognosis of patientswith HCC by frequent recurrence after treatment for HCC and deterioration of hepatic function associated with HCC *** meta-analysis showed that antiviral treatment reduces HCC recurrence and liver-related mortality after curative therapy of *** the strong relationship between high HBV DNA load and poor survival outcome of HCC patients due to cancer progression,it is expected that long-term antiviral therapy results in the sustained HBV suppression,control of inflammation,reduction in HCC progression,and eventually in improved overall survival.

关键词： Hepatitis B virus DNA Hepatocellular carcinoma Progression Prognosis

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Shadow Detection and Removal From Photo-Realistic Synthetic Urban Image Using Deep Learning

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Computers, Materials & Continua 2020年第1期62卷 459-472页

作者： Hee-Jin yoon Kang-Jik Kim jun-Chul Chun Department of Computer Science Kyonggi UniversityGyeonggi-do16227Korea

Recently,virtual reality technology that can interact with various data is used for urban design and ***,one of the most important elements in virtual reality technology,means visual expression so that a person can experience three-dimensional space like *** obtain this realism,real-world data are used in the various *** example,in order to increase the realism of 3D modeled building textures real aerial images are utilized in 3D ***,the aerial image captured during the day can be shadowed by the sun and it can cause the distortion or deterioration of *** resolve this problem,researches on detecting and removing shadows have been conducted,but the detecting and removing shadow is still considered as a challenging *** this paper,we propose a novel method for detecting and removing shadows using deep *** this work,we first a build a new dataset of photo-realistic synthetic urban data based on the virtual environment using 3D spatial information provided by *** detecting and removing shadow from the dataset,firstly,the 1-channel shadow mask image is inferred from the 3-channel shadow image through the ***,to generate a shadow-free image,a 3-channel shadow image and a detected 1-channel shadow mask into the GAN is *** the experiments,we can prove that the proposed method outperforms the existing methods in detecting and removing shadow.

关键词： Deep-learning shadow detection shadow removal synthetic data

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Deneddylase 1 regulates deneddylase activity of the Cop9 signalosome in Drosophila melanogaster

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Insect Science 2017年第1期24卷 27-34页

作者： Kiyoung Kim Jeongsook yoon Jeongbin Yim Hyung-jun Kim Department of Medical Biotechnology Soonchunhyang University Asan 336-745 Division of Intractable Diseases CenterforBiomedical Sciences National Institute of Health Cheongwon 361-951 Department of Neural Development and Disease Korea Brain Research Institute Daegu 701-300 Korea

NEDD8 conjugation of Cullin has an important role in ubiquitin-mediated protein degradation. The COP9 signalosome, of which CSN5 is the major catalytic subunit, is a major Cullin deneddylase, Another deneddylase, Deneddylase 1, has also been shown to process the Nedd8 precursor. In Drosophila, the DEN1 mutants do not have increased levels of Cullin neddylation, but instead show a significant decrease in neddylated Cullin. This characteristic decrease in neddylated Cullins in the DEN1^null background can be rescued by UAS-dDEN1^WT overexpression but not by overexpression of mature NEDDS, indicating that this phenotype is distinct from the NEDD8-processing function of DENI. We examined the role of DEN 1-CSN interaction in regulating Cullin neddylation. Overexpression of DEN1 in a CSN5^hypo background slightly reduced unneddylated Cullin levels. The CSN5, DEN1 double mutation partially rescues the premature lethality associated with the CSN5 single mutation. These results suggest that DEN1 regulates Cullin neddylation by suppressing CSN deneddylase activity.

关键词： COP9 signalosome Cullin DEN1 Drosophila NEDD8

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