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Growth and Magnetic Properties of Sol-Gel Derived Co-Doped ZnO Thin Film

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Journal of Rare Earths 2006年第Z1期24卷 59-63页

作者： Young sung Kim Ki Chul Kim Won Pil Tae Dae ho Yoon Tae Seok Park Su Jeong suh Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Cambridge-ETRI Joint R&D Centre Electronics and Telecommunications Research Institute Daejeon 305-350 Korea Ulsan Industry Promotion Techno Park Ulsan 683-804 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea

Zn1-xCoxO films were grown on glass by sol-gel spin coating process. A homogeneous and stable Zn1-xCoxO sol was prepared by dissolving zinc acetate dihydrate, cobalt acetate tetrahydrate and aluminium chloride hexahydrate as solutes in solution of isopropanol and monoethanolamine. The films were postheated and vacuum annealed, and investigated for c-axis preferred orientation and electromagnetic properties. Zn1-xCoxO films with different Co concentrations were oriented well along the c-axis, especially the Zn1-xCoxO film with 10% Co(atom fraction) was highly c-axis oriented. The transmittance spectra show that Zn1-xCoxO films occur d-d transition and sp-d exchange interaction between Co2+ ions. The electrical resistivity of the films at 10% Co had the lowest value because the crystallite size became largest and the crystallinity of the c-axis was improved. X-ray photoelectron spectroscopy and alternating gradient magnetometer analyses indicated that no Co metal cluster was formed, and the ferromagnetism at room temperature appeared. The characteristics of the electrical resistivity and room temperature ferromagnetism of sol-gel derived Zn1-xCoxO films suggest a potential application of dilute magnetic semiconductor devices.

关键词： sol-gel Zn1-xCoxO thin film dilute magnetic semiconductor (DMS)

Quantitative analysis of mechanical properties associated with aging treatment and microstructure in Mg-Al-Zn alloys through machine learning

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Journal of Materials Science & Technology 2022年第12期107卷 52-63页

作者： Joung Sik suh Byeong-Chan suh Sang Eun Lee Jun ho Bae Byoung Gi Moon Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

The present study proposes a methodology for predicting the mechanical properties of AZ61 and AZ91alloys associated with microstructure,texture and aging parameters and estimating predictor *** this,we investigate quantitative correlations between microstructure,texture and mechanical properties of aged AZ61 and AZ91 rods through machine *** regression analysis focuses on the precipitation behavior of Mg17Al12as the main second phase of Mg-Al-Zn alloys with respect to aging *** simplify data generation,only SEM images were used to quantify the features of discontinuous and continuous *** overcome the lack of data and make the most of the measured data,we devised a method to extend the existing dataset by a factor of 9 using the mean and standard deviation of the measured *** neural networks predicted tensile and compressive yield strengths and resultant yield asymmetry with a high accuracy of over 98%using 11 predictors for a total of *** tree learning quantitatively assessed the importance of predictors in determining the mechanical properties of aged AZ61 and AZ91 rods.

关键词： Magnesium alloy Aging treatment Microstructure Mechanical properties Machine learning

Blood flow Interpretation in Femoral Pseudoaneurysm

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Journal of Thermal Science 2013年第3期22卷 229-233页

作者： Sang-ho suh Young ho Choi Hyoung-ho Kim Min-Gyu Jeon Deog-Hee Doh Dept. of Mechanical Engineering Soongsil University Department of Radiology Seoul Nat'l University Boramae Hospital Graduate School Korea Maritime Univ. Division of Mechanical and Energy Systems Engineering Korea Maritime University

A femoral artery pseudoaneurysm is one complication of vascular intervention, and the incidence is increasing. Early management is then needed to avoid potential dangers from it. It differs from a true aneurysm in that it doesn't include any component of the vascular wall, and is not studied as much as a true aneurysm. Here, a model of a femoral pseudoaneurysm was made and a Computational Fluid Dynamics(CFD) simulation was verified with PIV experiment. Afterwards, a CFD simulation with two different models was performed to look for any findings which may help in developing new treatment methods.

关键词： Femoral Artery, Pseudoaneurysm, Numerical and PIV experimental Interpretation

Anterograde jejunojejunal intussusception resulted in acute efferent loop syndrome after subtotal gastrectomy

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World Journal of Gastroenterology 2010年第27期16卷 3472-3474页

作者： Jung Myun Kwak Jin Kim sung Ock suh Department of Surgery Korea University College of Medicine

Postoperative intussusception is an unusual clinical entity in adults,and is rarely encountered as a complication following gastric *** most common type after gastric surgery is retrograde jejunogastric intussusception,and jejunojejunal intussusception has been rarely *** report a case of anterograde jejunojejunal intussusception after radical subtotal gastrectomy with Billroth Ⅱ anastomosis in a 38-year-old Korean woman with early gastric cancer,and include a review of the literature on this unusual complication.

关键词： Intussusception Postoperative complications Gastrectomy

YouTube as a source of patient information on gallstone disease

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World Journal of Gastroenterology 2014年第14期20卷 4066-4070页

作者： Jun suh Lee ho Seok Seo Tae ho hong Department of Surgery Armed Forces Capital Hospital Department of Surgery Seoul St. Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM: To investigate the quality of YouTube videos on gallstone disease and to assess viewer response according to quality.

关键词： YouTube Gallstone disease Gallstone Gallbladder Cholecystitis

A Study on Energy Saving Rate for Variable Speed Condition of Multistage Centrifugal Pump

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Journal of Thermal Science 2015年第6期24卷 566-573页

作者： Sang-ho suh Rakibuzzaman Kyung-Wuk Kim Hyoung-ho Kim In Sik Yoon Min-Tae Cho Department of Mechanical Engineering Soongsil University Dooch Co. 295 Sagok-ri Jangan- Myeon Hwaseong-si Gyeonggi-do 445-942 South Korea

Centrifugal pumps are being widely used in many industrial and commercial *** of these pumps are being operated at constant speed but could provide energy savings through adjustable speed *** purpose of this study was to get the energy saving rates of the multistage centrifugal pump with variable speed *** this investigation an experimental set up of variable flow and pressure system was made to get energy saving rates and numerical analyses are applied to validate the pump *** energy saving and therefore the cost saving depends on the specific duty cycle of which the machine *** cycle is the proportion of time during which a component,device and system is *** duty cycle segmented into different flow rates and weighting the average value for each segment by the interval *** system was operated at 50%or less of the pump *** input power of the system was carried out by pump characteristics curve of each operating *** energy consumption was done by the product of specific duty cycle and the input power of the system for constant speed and variable speed drive *** total energy consumed for constant speed drive pump was 75,770 k *** and for variable speed drive pump was 31,700 k *** total energy saving of the system was 44,070 k *** or 58.16%***,this paper suggests a method of implementing an energy saving on variable-flow and pressure system of the multistage centrifugal pump.

关键词： Multistage Centrifugal Pump Performance Analysis Energy saving rate SST Model Duty Cycle

Current management of hepatocellular carcinoma:An Eastern perspective

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World Journal of Gastroenterology 2015年第13期21卷 3826-3842页

作者： Hyung Joon Yim Sang Jun suh Soon ho Um Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University Ansan HospitalAnsan-si 425-707Gyeonggi-doSouth Korea Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University Anam HospitalKorea University College of MedicineSeoul 136-705South Korea

Hepatocellular carcinoma(HCC) is one of the leading causes of cancer death, especially in Eastern areas. With advancements in diagnosis and treatment modalities for HCC, the survival and prognosis of HCC patients are improving. however, treatment patterns are not uniform between areas despite efforts to promote a common protocol. Although many hepatologists in Asian countries may adopt the principles of the Barcelona Clinic Liver Cancer staging system, they are also independently making an effort to expand the indications of each treatment and to combine therapies for better outcomes. Several expanded criteria for liver transplantation in HCC have been developed in Asian countries. Living donor liver transplantation is much more commonly performed in these countries than deceased donor liver transplantation, and it may be preceded by other treatments such as the down-staging of tumors. Local ablation therapies are often combined with transarterial chemoembolization( TACE) and the outcome is comparable to that of surgical resection. The indications of TACE are expanding, and there are new types of transarterial therapies. Although data on drug-eluting beads, TACE, and radioembolization in Asian countries are still relatively sparse compared with Western countries, these methods are gradually gaining popularity because of better tolerability and the possibility of improved response rates. Hepatic arterial infusion chemotherapy and radiotherapy are not included in Western guidelines, but are currently being used actively in several Asian countries. For more advanced HCCs, appropriate combinations of TACE, radiotherapy, and sorafenib can be considered, and emerging data indicate improved outcomes of combination therapies compared with single therapies. To include these paradigm shifts into newer treatment guidelines, more studies may be needed, but they are certainly in progress.

关键词： Hepatocellular carcinoma Eastern Treatment Guideli

Transparent Access to Heterogeneous IoT Based on Virtual Resources

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Computers, Materials & Continua 2023年第3期74卷 4983-4999页

作者： Wenquan Jin Sunhwan Lim Young-ho suh Chanwon Park Dohyeun Kim Big Data Research Center Jeju National UniversityJeju63243Korea Autonomous IoT Research Section Intelligent Convergence Research LaboratoryElectronics and Telecommunications Research InstituteDaejeon34129Korea Department of Computer Engineering Jeju National UniversityJeju63243Korea

The Internet of Things(IoT)inspires industries to deploy a massive number of connected devices to provide smart and ubiquitous services to influence our daily *** computing leverages sufficient computation and storage at the edge of the network to enable deploying complex functions closer to the environment using Internet-connected *** to the purpose of the environment including privacy level,domain functionality,network scale and service quality,various environment-specific services can be provided through heterogeneous applications with sensors and actuators based on edge ***,for providing user-friendly service scenarios based on the transparent access to heterogeneous devices in edge computing,a consistent interface shall be provided to deliver services from edge computing to *** this paper,we propose transparent computing based on virtual resources to access heterogeneous IoT devices without considering the underlying network configuration at the edge of the *** supporting transparent access to different edge computing environments through a consistent interface,the virtual resource of edge gateway is proposed to bridge the Internet and devices which are deployed on the edge of the *** proposed edge gateway exposes the services of the Internet of Things devices to the Internet using virtual resources that represent the resources of physical *** virtual resources provide a consistent interface to enable clients to access devices in edge computing without considering underlying *** virtual resource is generated by the resource directory in the edge gateway through the registration of a *** on the device registration,the device information is stored in the gateway to link virtual resources and devices for translating messages according to the destination protocols and identifying physical devices that are represented by virtual ***,through collaboration with the serv

关键词： Internet of things edge computing edge gateway transparent computing virtualization resource directory virtual resource

Reduced graphene oxide-based materials for electrochemical energy conversion reactions

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Carbon Energy 2019年第1期1卷 85-108页

作者： Seokhoon Choi Changyeon Kim Jun Min suh ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoulRepublic of Korea

There have been ever-growing demands to develop advanced electrocatalysts for renewable energy conversion over the past *** a promising platform for advanced electrocatalysts,reduced graphene oxide(rGO)has attracted substantial research interests in a variety of electrochemical energy conversion *** versatile utility is mainly attributed to unique physical and chemical properties,such as high specific surface area,tunable electronic structure,and the feasibility of structural modification and ***,a comprehensive discussion is provided upon recent advances in the material preparation,characterization,and the catalytic activity of rGO-based electrocatalysts for various electrochemical energy conversion reactions(water splitting,CO2 reduction reaction,N2 reduction reaction,and O2 reduction reaction).Major advantages of rGO and the related challenges for enhancing their catalytic performance are addressed.

关键词： CO2 reduction reaction electrocatalysis N2 reduction reaction O2 reduction reaction reduced graphene oxide water splitting