检索结果-南通市图书馆

Nucleation and growth behavior of coating film on Mg–Al–Zn alloy with different surface topographies via plasma electrolytic oxidation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第8期10卷 2185-2192页

作者： Nisa Nashrah sung Hun baek Young Gun Ko Materials Electrochemistry Group School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea

This work was made to investigate how nucleation and growth behavior of the coating film were affected by surface topographies of Mg–Al–Zn alloy substrate during the initial stage of plasma electrolytic oxidation(PEO).To satisfy this end,a single substrate was prepared by mechanical treatment exhibiting rough and smooth regions with an equal area on the *** rough region with prominent hills and grooves induced the breakdown of passive film,which was indicated by an early appearance of plasma discharge on the rough region since nucleation of coating film occurred preferentially around the ***,the coating film grown on the grooves was somewhat thicker and more porous than the film grown on the hills and smooth *** was due to the fact that the growth of the coating film was found to be localized in the presence of rough region,which was in line with the discharge ***,the nucleation and growth behavior during the initial stage of PEO will be discussed schematically on the basis of microstructural interpretation.

关键词： Mg alloy Surface roughness Plasma electrolytic oxidation Coating film

Survival analysis following early surgical success in intermittent exotropia surgery

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2014年第3期7卷 528-533页

作者： Joo Yeon Lee sung Ju Ko sung Uk baek Department of Ophthalmology Hallym University College of Medicine

AIM:To assess the consecutive recurrence following early success of intermittent exotropia surgery and to determine the clinical factors that affect the ***:One hundred and thirty-five patients who underwent intermittent exotropia surgery and experienced early surgical success[≤5 prism diopters(PD)esophoria(E)to≤10 PD exophoria(X)on the postoperative sixth month]were enrolled in this *** consecutive survival on the postoperative first year,second year and third year and at the last visit of fourth year or more,and the factors that might affect their survival,were *** final surgical outcomes after the postoperative fourth year were also investigated by dividing the patients into the success group(≤5 PD E to≤10 PD X)and the failure group(>5 PD esodeviation or>10 PD exodeviation)RESULTS:The survival rates from the Kaplan-Meier analysis were 97.78%,92.89%,83.70%and 50.49%on the postoperative first,second and third years and fourth year or more,*** of the clinical factors was determined to have affected the *** amount of the exodrift was largest(2.29 PD)between the first year and the second year,and smallest(1.47 PD)between the fourth year and the last ***-three patients had their final visit after the postoperative fourth year,and 29 of them were in the failure *** patients in the failure group had an intermittent exotropia(IXT)of<20 PD with good to fair distant fusion;two had an IXT of<20 PD with poor distant fusion;one had an IXT of≥20 PD with fair distant fusion;and another had delayed-onset consecutive *** exodeviation on the postoperative sixth month was smaller in the success group than in the failure group(2.81 PD vs 5.86 PD,P=0.012).The reoperation rate for recurrent IXT was 3.7%.CONCLUSION:The survival rate steadily decreases with the exodrift,but the amount of the exodrift decreases with long-term *** final outcomes demonstrate favorable results via surgic

关键词： long-term outcome survival analysis intermittent exotropia surgery

Hepatothorax due to a right diaphragmatic rupture related to duodenal ulcer perforation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第39期18卷 5649-5652页

作者： Se-Jin baek Jin Kim sung-Ho Lee Department of Surgery Korea University Anam HospitalSeoul 136-705South Korea Department of Thoracic Surgery Korea University Anam HospitalSeoul 136-705South Korea

Here, we present the case of a 53-year-old man with a hepatothorax due to a right diaphragmatic rupture related to duodenal ulcer perforation. On admission, the patient complained of severe acute abdominal pain, with physical examination findings suspicious for a perforated peptic ulcer. Of note, the patient had no history of other medical conditions or recent trauma, and the initial chest radiography and laboratory findings were not specific. A subsequent abdominal computed tomography revealed intrathoracic displacement of the liver, gallbladder, transverse colon and omentum through a right diaphragmatic defect. The patient then underwent an explorative laparotomy that confirmed duodenal ulcer perforation. A primary repair of the duodenal perforation was performed, and the diaphrag-matic defect was repaired using a polytetrafluoroeth-ylene patch after the organs were reduced and the cavity irrigated. This particular case proves interesting as right-sided spontaneous diaphragmatic ruptures are very rare and difficult to diagnose. Additionally, the best treatment for such large diaphragmatic defects is still controversial, especially in cases of intrathoracic or intra-abdominal contamination.

关键词： Diaphragmatic rupture Hepatothorax Du-odenal ulcer perforation Polytetrafluoroethylene mesh

Aging Analysis Framework of Windows-Based Systems through Differential-Analysis of System Snapshots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 5091-5102页

作者： Eun-Tae Jang sung Hoon baek Ki-Woong Park SysCore Lab Sejong UniversitySeoul05006Korea Department of Computer System Engineering Jungwon UniversityChungcheongbuk-do28024Korea

When aWindows-based system is used for an exceedingly long time,its performance degrades,and the error occurrence rate tends to *** is generally called system *** investigate the reasons for system aging,various studies have been conducted within the range of the operating system kernel to the user ***,finding an accurate reason for system performance degradation remains challenging research *** this study,system monitoring was conducted by dividing a system into‘before software installation,’‘after software installation,’and‘after software removal.’We confirmed that when a software installed in a system is removed,various system elements,such as storage and memory,are not restored to the level prior to the software ***,we established a hypothesis regarding the performance degradation of a computer system owing to repeated software installation/removal operations,investigated the correlation between system aging and repeated software installation/removal operations,and proposed a system aging analysis framework for analyzing the reason behind system *** the proposed system aging analysis framework,we aim to forcibly age a Windows-based system by repeating the software installation/removal operation by utilizing the system forced aging *** framework identifies the elements affecting system performance through a differential data analysis of the system time-series data extracted by the system performance extraction and system component snapshot ***,the aging analysis framework presented in this study is expected to be effectively utilized as an index for studying system aging.

关键词： System aging virtual machine system analysis

Remarkably slow corrosion rate of high-purity Mg microalloyed with 0.05wt% Sc

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第3期11卷 991-997页

作者： Soo-Min baek Jeong-Ki Kim Du-Won Min sung Soo Park Department of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea

We report that the corrosion resistance of Mg is significantly improved by adding 0.05wt%*** rates evaluated from weight loss values after room-temperature immersion in 0.6 M NaCl solution for two weeks were 0.27 and 4.0 mm y^(-1)for the high-purity Mg samples with and without microalloyed 0.05wt%Sc,*** beneficial effect of Sc microalloying on the corrosion resistance of Mg is discussed in connection with Sc-induced microstructural modifications.

关键词： Magnesium Microalloying Intermetallic phase Microgalvanic corrosion

Network Traffic Obfuscation System for IIoT-Cloud Control Systems

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第9期72卷 4911-4929页

作者： Yangjae Lee sung Hoon baek Jung Taek Seo Ki-Woong Park SysCore Lab. Sejong UniversitySeoul05006Korea Department of Computer System Engineering Jungwon UniversityChungcheongbuk-do28024Korea Department of Computer Engineering Gachon UniversityGyeonggi-do13120Korea

One of the latest technologies enabling remote control,operational efficiency upgrades,and real-time big-data monitoring in an industrial control system(ICS)is the IIoT-Cloud ICS,which integrates the Industrial Internet of Things(IIoT)and the cloud into the *** an ICS benefits from the application of IIoT and the cloud in terms of cost reduction,efficiency improvement,and real-time monitoring,the application of this technology to an ICS poses an unprecedented security risk by exposing its terminal devices to the outside *** adversary can collect information regarding senders,recipients,and prime-time slots through traffic analysis and use it as a linchpin for the next attack,posing a potential threat to the *** address this problem,we designed a network traffic obfuscation system(NTOS)for the IIoT-Cloud ICS,based on the requirements derived from the ICS characteristics and limitations of existing NTOS *** a strategy to solve this problem wherein a decrease in the traffic volume facilitates traffic analysis or reduces the packet transmission speed,we proposed an NTOS based on packet scrambling,wherein a packet is split into multiple pieces before transmission,thus obfuscating network *** minimize the ICS modification and downtime,the proposed NTOS was designed using an agentbased *** addition,for the ICS network traffic analyzer to operate normally in an environment wherein the NTOS is applied,a rule-based NTOS was adopted such that the actual traffic flow is known only to the device that is aware of the rule and is blocked for *** experimental results verified that the same time requested for response and level of difficulty of analysis were maintained by the application of an NTOS based on packet scrambling,even when the number of requests received by the server per second was *** network traffic analyzer of the ICS can capture the packet flow by using the pre-communicated NTOS *** addition,by designing an N

关键词： Cloud computing system moving-target defense container orchestration

Influence of contact curvature on frictional energy dissipation under varying tangential loads

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2024年第2期12卷 363-374页

作者： Sumin baek Seunghun baek School of Mechanical Engineering Pusan National UniversityPusan 46241Republic of Korea

This study investigates the effect of contact surface curvatures on the friction response under varying tangential loadings using a finite element(FE)*** results showed that the geometry of the surface influences the contact force at the interface and reduces the friction effect through an unsteady distribution of the contact *** relationship between the friction effect,excitation,and contact surface shape was also examined,revealing a linear inverse relationship between the friction and *** findings provide a comprehensive understanding of the frictional interactions between elastic bodies and highlight the role of curvature as a design parameter for regulating the friction effect.

关键词： frictional contact curvelinear contact frictional energy dissipation contact curvature

Real-time multiaxial strain mapping using computer vision integrated optical sensors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Flexible Electronics 2023年第1期7卷 253-264页

作者： sunguk Hong Vega Pradana Rachim Jin-Hyeok baek sung-Min Park Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Department of Convergence IT Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea School of Interdisciplinary Bioscience and Bioengineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Institute of Convergence Science Yonsei UniversitySeoul 120-749South Korea

Soft strain sensors pose great potential for emerging human–machine ***,their real-world applications have been limited due to challenges such as low reproducibility,susceptibility to environmental noise,and short lifetimes,which are attributed to nanotechnologies,including microfabrication *** this study,we present a computer vision-based optical strain(CVOS)sensor system that integrates computer vision with streamlined microfabrication techniques to overcome these challenges and facilitate real-time multiaxial strain *** proposed CVOS sensor consists of an easily fabricated soft silicone substrate with micro-markers and a tiny camera for highly sensitive marker ***-time multiaxial strain mapping allows for measuring and distinguishing complex multi-directional strain patterns,providing the proposed CVOS sensor with higher *** results indicate that the proposed CVOS sensor is a promising approach for the development of highly sensitive and versatile human–machine interfaces that can operate long-term under real-world conditions.

关键词： computer mapping strain

Teleconnections:Summer Monsoon over Korea and India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2002年第4期19卷 665-676页

作者： baek-Jo Kim sung-Euii Moon 陆日宇 R.H.Kripalani Meteorological Research Institute Korea Meteorological Administration Seoul 156-720 Korea Korea Meteorological Administration Seoul 156-720 Korea LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 Indian Institute of Tropical Meteorology Pune 411008 India

This study investigates the relationship between the summer monsoon rainfall over Korea and India, by using correlation analysis and Singular Value Decomposition (SVD).Results reveal that summer monsoon rainfall over Korea is negatively (significant at the 99% level) cor-related with the rainfall over the northwest and central parts of India. In addition, coupled spatial modes be-tween the rainfall over Korea and India have been identified by the SVD analysis. The squared covariance fraction explained by the first mode is 70% and the correlation coefficient between the time coefficients of the two fields is significant at the 99% level, indicating that the coupled mode reflects a large part of the interaction between the summer monsoon rainfall over Korea and India. The first mode clearly demon-strates the existence of a significant negative correlation between the rainfall over the northwest and central parts of India and the rainfall over *** mechanisms of this correlation are investigated by analyzing the variation of upper-level at-mospheric circulation associated with the Tibetan high using NCEP/NCAR Reanalysis data.

关键词： summer monsoon rainfall tibetan high singular value decomposition (SVD)