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A Time Pattern-Based Intelligent Cache Optimization Policy on Korea Advanced Research Network

Intelligent Automation & Soft Computing 2023年第6期36卷 3743-3759页

作者： Waleed Akbar Afaq Muhammad Wang-cheol Song Department of Computer Engineering Jeju National UniversityJeju-si63243Korea

Data is growing quickly due to a significant increase in social media ***,billions of people use an enormous amount of data to access the *** backbone network experiences a substantial load as a result of an increase in *** in the same region or company frequently ask for similar material,especially on social media *** subsequent request for the same content can be satisfied from the edge if stored in proximity to the *** that require relatively low latency can use Content Delivery Network(CDN)technology to meet their *** edge and the data center con-stitute the CDN *** fulfill requests from the edge and minimize the impact on the network,the requested content can be buffered closer to the user *** content should be kept on the edge is the primary *** cache policy has been optimized using various conventional and unconventional methods,but they have yet to include the timestamp beside a video *** 24-h content request pattern was obtained from publicly available *** popularity of a video is influenced by the time of day,as shown by a time-based video *** present a cache optimization method based on a time-based pat-tern of *** problem is described as a cache hit ratio maximization pro-blem emphasizing a relevance score and machine learning model accuracy.A model predicts the video to be cached in the next time stamp,and the relevance score identifies the video to be removed from the ***,we gather the logs and generate the content requests using an extracted video request *** logs are pre-processed to create a dataset divided into three-time slots per day.A Long short-term memory(LSTM)model is trained on this dataset to forecast the video at the next time *** proposed optimized caching policy is evaluated on our CDN architecture deployed on the Korean Advanced Research Network(KOREN)*** finding

关键词： Multimedia content delivery request pattern recognition real-time machine learning deep learning optimization caching edge computing

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Aerodynamic force generation of an insect-inspired flapper actuated by a compressed unimorph actuator

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Chinese Science Bulletin 2009年第16期54卷 2871-2879页

作者： NGUYEN Quoc-Viet PARK Hoon C GOO Nam S byun Doyoung Department of Advanced Technology Fusion Konkuk University National Research Laboratory for Biomimetics and Intelligent Microsystems Konkuk University Department of Aerospace Engineering Konkuk University

We examined experimentally the flapping performance in terms of aerodynamic force generation of an insect-inspired flapper actuated by both of original LIPCA and compressed LIPCA. Flapping tests for two artificial wing shapes of horse botfly and hawk moth were conducted at the wing rotation angle of 60° and a flapping frequency range from 6 Hz to 12 Hz to find the optimum flapping frequency and to investigate the effect of compressed LIPCA and wing shape on the force generation. Flapping tests in the vacuum were also undertaken to measure the induced inertia force. The aerodynamic force was calculated by subtracting the inertia force from the total force measured in the air. It was found that the average inertia force was relatively small when compared with the average total force. The use of the compressed LIPCA could significantly improve the flapping angle of the flapper from 110° to 130° (18.2% increase) resulting in 24.5% increase in the average aerodynamic force. It was also found that flapper with hawk moth wings could produce larger force than the flapper with horse botfly wings.

关键词：空气动力驱动器插板压缩部队昆虫压电片单层

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Numerical study on Rayleigh-Taylor effect on cylindrically converging Richtmyer-Meshkov instability

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 68-77页

作者： ZhiGang Zhai Fu Zhang ZhangBo Zhou JuChun Ding Chih-yung Wen Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026China Beijing Institute of Space Long March Vehicle Beijing 100076China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Evolution of a two-dimensional air/SF6 single-mode interface is numerically investigated by an upwind CE/SE method under a cylindrically converging circumstance. The Rayleigh-Taylor effect caused by the flow deceleration on the phase inversion(RTPI)is highlighted. The RTPI was firstly observed in our previous experiment, but the related mechanism remains unclear. By isolating the three-dimensional effect, it is found here that the initial amplitude(a0), the azimuthal mode number(k0) and the re-shocking moment are the three major parameters which determine the RTPI occurrence. In the variable space of(k0, a0), a critical a0 for the RTPI occurrence is solved for each k0, and there exists a threshold value of k0 below which the RTPI will not occur no matter what a0 is. There exists a special k0 corresponding to the largest critical a0, and the reduction rule of critical a0 with k0 can be well described by an exponential decay function. The results show that the occurrence of the RTPI requires a small a0 which should be less than a critical value, a large k0 which should exceed a threshold, and a right impinging moment of the re-shock which should be later than the RTPI occurrence. Finally, the effects of the incident shock strength, the density ratio and the initial position of the interface on the threshold value of k0 and on the maximum critical a0 are examined. These new findings would facilitate the understanding of the converging Richtmyer-Meshkov instability and would be helpful for designing an optimal structure of the inertia confinement fusion capsule.

关键词： converging shock wave Rayleigh-Taylor effect Richtmyer-Meshkov instability

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Obturator hernia-a rare etiology of lateral thigh pain:A case report

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World Journal of Clinical Cases 2021年第34期9卷 10728-10732页

作者： Jun Young Kim Min cheol Chang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityTaegu 705-717South Korea

BACKGROUND Lateral thigh pain is a common complaint in patients visiting a pain ***,we describe the case of a patient with lateral thigh pain caused by an obturator *** SUMMARY An 83-year-old woman visited the emergency room with suddenly aggravated right lateral thigh *** resonance imaging of the thigh revealed no abnormal findings in the lateral thigh ***,an obturator hernia between the pectineus and obturator externus muscles was observed by *** computed tomography revealed a herniated small bowel with an incarceration point at the right obturator canal and a dilated loop of the small bowel *** of the right inguinal region revealed a distended bowel loop in the right pectineus *** Our report provides clinicians with information that an obturator hernia can cause lateral thigh pain.

关键词： Obturator hernia Pain Magnetic resonance image Computed tomography Ultrasonography Case report

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Mobility Management in Small Cell Cluster of Cellular Network

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Computers, Materials & Continua 2021年第10期69卷 627-645页

作者： Adeel Rafiq Muhammad Afaq Khizar Abbas Wang-cheol Song Department of Computer Engineering Jeju National UniversityJeju63243Korea

The installation of small cells in a 5G network extends the maximum coverage and provides high ***,this approach increases the handover overhead in the Core Network(CN)due to frequent *** variation of user density and movement inside a region of small cells also increases the handover overhead in ***,the present 5G system cannot reduce the handover overhead in CN under such circumstances because it relies on a traditionally rigid and complex hierarchical sequence for a handover ***,Not Only Stack(NO Stack)architecture has been introduced for Radio Access Network(RAN)to reduce the signaling during *** paper proposes a system based on NO Stack architecture and solves the aforementioned problem by adding a dedicated local mobility controller to the edge cloud for each *** dedicated cluster controller manages the user mobility locally inside a cluster and also maintains the forwarding data of a mobile user *** reduce the latency for X2-based handover requests,an edge cloud infrastructure has been also developed to provide high-computing for dedicated controllers at the edge of a cellular *** proposed system is also compared with the traditional 3GPP architecture and other works in the context of overhead and delay caused by X2-based handover requests during user *** results show that the inclusion of a dedicated local controller for small clusters together with the implementation of NO Stack framework reduces the significant amount of overhead of X2-based handover requests at CN.

关键词： Radio access network mobility management edge cloud computing X2-based handover

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Notch1 and Notch4 are markers for poor prognosis of hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2013年第3期12卷 286-294页

作者： Soomin Ahn Jiyeon Hyeon cheol-Keun Park Department of Pathology Samsung Medical Center Sungkyunkwan University School of Medicine

BACKGROUND: Notch signaling is critical to physiologic angiogenesis and has been implicated in tumor angiogenesis and metastasis. Notch signaling was reported to exert either oncogenic or tumor-suppressive function in hepatocellular carcinoma (HCC) tumorigenesis. However, the prognostic significance of Notch receptors in HCC remains uncertain. In this study, we investigated the roles of Notch receptors in the prognosis of HCC. METHODS: We investigated the expressions of Notch receptors in tumor tissue microarrays of 288 patients with primary HCC who had undergone curative resection using immunohistochemistry. Additionally, prognostic factors of HCC were examined by univariate and multivariate analyses. The median follow-up period was 97.1 months. Tumor recurrence was detected in 189 patients (65.6%), and 99 (34.4%) died of HCC. RESULTS: Cytoplasmic expression of Notch1, cytoplasmic expression of Notch3, coexistent nuclear expression of Notch3, and cytoplasmic Notch4 overexpression were observed in 145 (50.3%), 60 (20.8%), 17 (5.9%), and 172 (59.7%) of the 288 HCCs, respectively. Multivariate analyses revealed that Notch1 expression (P=0.029), Edmondson grade Ⅲ (P=0.038), and higher BCLC stage (P<0.001) were independent predictors of shorter disease-free survival. Cytoplasmic Notch3 expression tended to be an independent predictor of shorter disease-free survival (P=0.055). Notch1 expression (P=0.039), Notch4 overexpression (P=0.012), and higher BCLC stage (P<0.001) were independent predictors of shorter disease-specific survival. On univariate analysis, Notch1 expression tended to show an unfavorable influence on disease-specific survival (P=0.063) and Notch4 overexpression did not show an unfavorable influence on disease-specific survival (P=0.103). CONCLUSIONS: Notch1 expression might be an independent predictor of both shorter disease-free survival and shorter disease-specific survival in HCC patients after curative resection. Notch4 overexpression might be

关键词： Notch1 Notch4 hepatocellular carcinoma recurrence survival

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Expression of E-cadherin and α-catenin in a varicocele-induced infertility rat model

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Asian Journal of Andrology 2011年第3期13卷 470-475,514页

作者： Hong Koo Ha Hyun Jun Park Nam cheol Park Department of Urology Pusan National University School of Medicine Busan 602739 Korea Medical Research Institute Pusan National University Hospital Busan 602739 Korea

The roles of E-cadherin and α-catenin were evaluated in the development of varicocele-induced infertility. Analysis of the association between the expression of E-cadherinla-catenin and clinical/pathological parameters was performed. Thirty lO-week-old male rats （experimental group） were used for the experiments; the left renal vein was ligated to form a varicocele. The abdomen was incised in 30 rats （control group） and no procedure was performed on 10 rats （baseline group）. The weights of the left testis, serum reactive oxygen species （ROS）, testosterone, luteinizing hormone （LH）, follicle-stimulating hormone （FSH） and degenerative changes in the seminiferous tubules after 4 and 8 weeks were recorded. The expression of E-cadherin and α-catenin was evaluated by immunohistochemical （IHC） staining and Western blot analysis. The ROS increased in the 8-week experimental group, compared with the baseline and control groups （P〈0.001 for both）. Additionally, FSH significantly increased in the 4- and 8-week experimental group compared with the control groups （P= 0.013 and P= 0.032, respectively）. The ratio of degenerative changes in the seminiferous tubules of the experimental groups increased. The IHC staining showed that the expression of E-cadherin and a-catenin decreased in the 4- and 8-week experimental groups. Similar to the IHC staining, the experimental group had decreased reactivity on Western blot analysis. The expression of E-cadherin and a-catenin was significantly associated with the ROS and degenerative changes in the seminiferous tubules. The results of this study suggest that damage to the blood-testis barrier （BTB） is associated with varicocele-induced male infertility, and that ROS may cause damage to the BTB.

关键词： α-catenin blood-testis barrier E-cadherin varicocele infertility

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Korean Morphological Analysis for Korean-Vietnamese Statistical Machine Translation

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Journal of Electronic Science and Technology 2017年第4期15卷 413-419页

作者： Quang-Phuoc Nguyen Joon-Choul Shin cheol-Young Ock Department of IT Convergence University of Ulsan Ulsan 44610 Republic of Korea

This paper describes the experiments with Korean-to-Vietnamese statistical machine translation(SMT). The fact that Korean is a morphologically complex language that does not have clear optimal word boundaries causes a major problem of translating into or from Korean. To solve this problem, we present a method to conduct a Korean morphological analysis by using a pre-analyzed partial word-phrase dictionary(PWD).Besides, we build a Korean-Vietnamese parallel corpus for training SMT models by collecting text from multilingual magazines. Then, we apply such a morphology analysis to Korean sentences that are included in the collected parallel corpus as a preprocessing step. The experiment results demonstrate a remarkable improvement of Korean-to-Vietnamese translation quality in term of bi-lingual evaluation understudy(BLEU).

关键词： Factored translation models Korean-Vietnamese parallel corpus morphological analysis statistical machine translation(SMT)

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Semi-Probabilistic Evaluation of System Redundancy for Existing Offshore Structures

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China Ocean Engineering 1995年第1期10卷 1-8页

作者： Zhang, Shengkum Chen, Kaisheng Mu, yung

In this paper, a new definition of structure system redundancy is proposed in view of the various measures for structure redundancy. By introducing the terms of structure system failure at the mechanism level and equivalent reliability index, the safety for existing offshore platforms can be evaluated by the semi-probabilistic method presented in this paper. Some numerical examples are given and satisfactory results have been obtained.

关键词： residual strength semi-probabilistic method damaged structure redundancy reliability index critical value

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Flow Management Mechanism in Software-Defined Network

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Computers, Materials & Continua 2022年第1期70卷 1437-1459页

作者： Eugene Tan yung-Wey Chong Mohammed F.R.Anbar National Advanced IPv6 Centre Universiti Sains MalaysiaUSMPenangMalaysia

Software-defined networking(SDN)is a paradigm shift in modern ***,centralised controller architecture in SDNimposed flow setup overhead issue as the control plane handles all flows regardless of size and *** frameworks strictly reduce control plane overhead and it does not focus on rule placement of the flows ***,existing frameworks do not focus on managing elephant flows like ***,the proposed mechanism will use the flow statistics gathering method such as random packet sampling to determine elephant flow and microflow via a predefined *** mechanism will ensure that the control plane works at an optimum workload because the controller only manages elephant flows via reactive routing and rule placement *** routing has reduced link bandwidth usage below the pre-defined ***,rule placement has increased average throughput and total transfer to 238%.Meanwhile,the data plane switches will be able to forward microflows via multipath wildcard routing without invoking controller in greater responding time by 85 ms faster in two Transmission Control Protocol(TCP)traffic and achieved 11%and 12%higher total transfer size and throughput ***,the controller’s workload reduced significantly to 48%in two TCP traffic.

关键词： Software-defined network controller flow management

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