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New para-magnetic(CoFeNi)(50)(CrMo)(50-x)(CB)x(x=20,25,30)non-equiatomic high entropy metallic glasses with wide supercooled liquid region and excellent mechanical properties

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Journal of Materials Science & Technology 2020年第8期36卷 135-143页

作者： Jeong Tae kim Sung Hwan Hong Jin man Park Jürgen Eckert Ki Buem kim Erich Schmid Institute of Materials Science Austrian Academy of Sciences(ÖAW)Jahnstrae 128700LeobenAustria Hybrid Materials Center(HMC) Department of Nanotechnology and Advanced Materials EngineeringSejong University209Neungdong-roGwangjin-guSeoul143-747Republic of Korea Global Technology Center(GTC) Samsung Electronics Co.Ltd129 Samsung-roYeongtong-guSuwonsiGyeonggi-do443-742Republic of Korea Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 128700LeobenAustria

In this study,high entropy metallic glasses(HEMGs)were developed through a combination of concepts for designing metallic glasses(main element+transition metal+metalloid element)and high-entropy alloys(more than five elements,each element having an atomic concentration between 5 at.%and 35 at.%).The developed metallic glass alloys are composed of Co-Fe-Ni main elements,transition metals(Cr,Mo)and metalloid elements(C,B).Moreover,the present work reports the thermal,mechanical and magnetic properties of(CoFeNi)(50)(CrMo)(50-x)(CB)x alloys with x=20,25,*** developed as-spun HEMGs exhibit typical paramagnetic properties even for a high amount of ferromagnetic elements(Co,Fe,and Ni)and have high elastic modulus(103–160 GPa)and hardness(14–27 GPa),thus possessing mechanical properties similar to well-known Co-based metallic glasses(Co-Cr-Mo-C-B system).In addition,some of the bulk samples prepared with a diameter of 2 mm form bulk metallic glasses with a high compressive strength around 3.5 *** mechanisms determining the stability of the supercooled liquid,as well as the paramagnetic and mechanical properties for the developed non-equiatomic HEMGs,are discussed.

关键词： Metallic glasses Paramagnetism High entropy alloys Phase stability

3D cellular visualization of intact mouse tooth using optical clearing without decalcification

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International Journal of Oral Science 2019年第3期11卷 223-230页

作者： Sujung Hong Jingu Lee Jin man kim Sun-Young kim Hyung-Ryong kim Pilhan kim Graduate School of Nanoscience and Technology Korea Advanced Institute of Science and Technology (KAIST)291 Daehak-roYuseong-guRepublic of Korea KI for Health Science and Technology (KIHST) Korea Advanced Institute of Science and Technology (KAIST)291 Deahak-roYuseong-guRepublic of Korea Department of Dentistry CHA Bundang Medical CenterCHA UniversitySeongnamRepublic of Korea Department of Conservative Dentistry and Dental Research Institute Seoul National University School of Dentistry101 Daehak-roJongno-guRepublic of Korea College of Dentistry Institute of Tissue Regeneration Engineering (ITREN)Dankook UniversityCheonanRepublic of Korea Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology (KAIST)291 Daehak-roYuseong-guRepublic of Korea

Dental pulp is composed of nerves,blood vessels,and various types of cells and surrounded by a thick and hard enamel-dentin *** to its importance in the maintenance of tooth vitality,there have been intensive efforts to analyze the complex cellularlevel organization of the dental pulp in *** conventional histologic analysis has provided microscopic images of the dental pulp,3-dimensional (3D) cellular-level visualization of the whole dental pulp in an intact tooth has remained a technically challenging *** is mainly due to the inevitable disruption and loss of microscopic structural features during the process of mechanical sectioning required for the preparation of the tooth sample for histological *** accomplish 3D microscopic observation of thick intact tissue,various optical clearing techniques have been developed mostly for soft tissue,and their application for hard tissues such as bone and teeth has only recently started to be *** this work,we established a simple and rapid optical clearing technique for intact mouse teeth without the time-consuming process of *** achieved 3D cellular-level visualization of the microvasculature and various immune cell distributions in the whole dental pulp of mouse teeth under normal and pathologic *** technique could be used to enable diverse research methods on tooth development and regeneration by providing 3D visualization of various pulpal cells in intact mouse teeth.

关键词： blood vessels Dental pulp soft tissue

Current status and challenges in sentinel node navigation surgery for early gastric cancer

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Chinese Journal of Cancer Research 2017年第2期29卷 93-99页

作者： Bang Wool Eom Young-II kim Hong man Yoon Soo-Jeong Cho jong Yeul Lee Chan Gyookim Soo Jin kim Ji Yoon Rho Seok Ki kim Myeong-Cherl Kook Young-Woo kim Keun Won center for gastric cancer national cancer centerrepublic of korea center for diagnostic oncology national cancer centerrepublic of korea

Although a number of feasibility studies for sentinel node （SN） concepts in gastric cancer have been conducted since 2000, there remains a debate regarding detailed detection techniques and oncological safety. Two important multicenter phase II clinical trials were performed in Japan that used different methods and reached different conclusions; one confirmed acceptable results with a false-negative rate of 7%, and the other showed an unacceptably high false-negative rate of 46.4%. The Sentinel Node Oriented Tailored Approach （SENORITA） trial is a multicenter randomized controlled phase 1/I trial being performed in Korea. Patient enrollment is now complete and the long-term results are currently awaited. Recently, an image-guided SN mapping technique using infrared ray/fluorescence was introduced. This method might be a promising technology because it allows the clear visualization of SNs. With regard to the primary tumor, the non-exposed endoscopic wall-inversion surgery technique and non-exposure endolaparoscopic full-thickness resection with simple suturing technique have been reported. These methods prevent abdominal infection and tumor seeding and can be good alternatives to conventional laparoscopic gastric wedge resection. For indications, SN navigation surgery can be extended to patients who underwent non-curative endoscopic resection. Although a few studies have been performed on these patients, sentinel concepts may be beneficial to patients as they omit the need for additional gastrectomy. SN navigation surgery can lead to actual organ-preserving surgery and plays a key role in improving the quality of life of patients with early gastric cancer in the future.

关键词： Sentinel node navigation surgery early gastric cancer SENORITA

Estimation of deformed laser heat sources and thermal analysis on laser assisted turning of square member

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Journal of Central South University 2012年第2期19卷 402-407页

作者： kim Jae-hyun kim Kwang-sun CHOI Jun-young LEE Choon-man Department of Mechanical Design and manufacturing Engineering Changwon National University

Laser assisted machining （LAM） has difficulties in estimating temperature after applying a LAM process due to its very small heat input area, large energy and movement. In particular, in the case of laser assisted turning （LAT） process, it is more difficult to estimate the temperature after preheating because it has a shape of ellipse when a laser heat source is rotated. A prediction method and thermal analysis method for heat source shapes were proposed as a square shaped member was preheated. The temperature distribution was calculated according to the rotation of the member. Compared with the results of the former study, the maximum temperature of the calculation results, 1 407.1 ℃, is 8.5 ℃ higher than that of the square member, which is 1 398.6 ℃. In a LAT process for a square member, the maximum temperature is 1 850.8 ℃. It is recognized that a laser power control process is required because square members show a maximum temperature that exceeds a melting temperature at around a vertex of the member according to the rotation.

关键词： laser assisted machining laser assisted turning laser preheating laser power control

Optimal rotor wear design in hypotrochoidal gear pump using genetic algorithm

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Journal of Central South University 2011年第3期18卷 718-725页

作者： KWON Soon-man kim Chang-Hyun SHIN Joong-ho Department of Mechanical Design and manufacturing Engineering Changwon National University

The wear rate between the rotors of a hypotrochoidal gear pump is *** the knowledge of shape design on the rotors,the contact stresses without hydrodynamic effect between the rotor teeth were evaluated through the calculation of the Hertzian contact *** on the above results and the sliding velocity between the rotors,a genetic algorithm (GA) was used as an optimization technique forminimizing the wear rate proportional factor (WRPF).The result shows that the wear rate or the WRPF can be reduced considerably,*** 12.8%,throughout the optimization using GA.

关键词： gerotor hypotrochoidal gear pump Hertzian contact stress wear rate proportional factor genetic algorithm

Development of CAD/CAM system and profile measuring device for CNC grinding machine to obtain an optimal grinding speed

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Journal of Central South University 2011年第1期18卷 146-152页

作者： LIM Sang-Heon kim Jae-Hyun LEE Choon-man Agency of Promoting Technology Innovation Gyeongnam TechnoparkChangwon 641-465Korea School of Mechatronics Changwon National University

Cam mechanics is one of the most popular devices for generating irregular motions and is widely used in automatic equipment,such as textile machines,internal combustion engines,and other automatic *** order to obtain a positive motion from the follower using a rotating cam,its shape should be correctly designed and *** development of an adequate CAD/CAM system for a cam profile CNC grinding machine is necessary to manufacture high-precision *** purpose of this study is the development of a CAD/CAM system and profile measuring device for a CNC grinding machine to obtain an optimal grinding speed with a constant surface *** types of disk cams were manufactured using the proposed algorithm and procedures to verify effectiveness of the developed CAD/CAM system.

关键词： cam CAD/CAM system CNC grinding machine optimal grinding speed

Evaluation of lubrication performance of crank pin bearing in a marine diesel engine

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Friction 2018年第4期6卷 464-471页

作者： Suk man MOON Yong Joo CHO Tae Wan kim School of Mechanical Engineering Pusan National University Department of Mechanical Engineering Pukyong National University

In this study, the lubrication performance of the crank pin bearing in a marine two–stroke diesel engine is evaluated to investigate the adhesional failure on the crank pin bearing. A numerical algorithm for the lubrication analysis considering motion analysis of the crank pin system is developed. The film pressure and thickness for three clearances and three lubricant temperatures are calculated. The results show that the lubricant temperature has a higher effect on film thickness than clearance. In terms of the film parameter, the operating condition that can result in solid–solid contact is investigated. We also suggest the desirable operating conditions of clearance and lubricant temperature to prevent the solid–solid contact.

关键词： crank pin bearing film thickness lubricant film parameter diesel engine

Patient safety culture and handoff evaluation of nurses in small and medium-sized hospitals

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International Journal of Nursing Sciences 2021年第1期8卷 58-64,I0004页

作者： Jung Hee kim Jung Lim Lee Eun man kim Department of Nursing Science Shinsung UniversityChungnamSouth Korea Department of Nursing Daejeon UniversityDaejeonSouth Korea Department of Nursing Science Sun Moon UniversityChungnamSouth Korea

Objectives:This study was conducted to investigate the current status of handoffs,perception of patient safety culture,and degrees of handoff evaluation in small and medium-sized hospitals and identified factors that make a difference in handoff ***:This is a descriptive study.425 nurses who work at small and medium-sized hospitals in South Korea were included in our *** completed a set of self-reporting questionnaires that evaluated demographic data,handoff-related characteristics,perception of patient safety culture,and handoff ***:Results showed that the overall score of awareness of a patient safety culture was 3.65±0.45,the level was *** score of handoff evaluation was 5.24±*** nurses experienced errors in handoff and most nurses had no guidelines and checklist in the *** evaluation differed significantly according to the level of education,work patterns,duration of hospital employment,handoff method,degree of satisfaction with the current handoff method,errors occurring at the time of handoff,handoff guidelines,and appropriateness of handoff education time(P<0.05).Conclusion:For handoff improvement,guidelines and standards should be *** is necessary to develop a structured handoff education *** formal handoff education should be implemented to spread knowledge uniformly.

关键词： Evaluation studies Handoff Hospital nursing staff Patient safety

Clinical application of liver stiffness measurement using transient elastography in chronic liver disease from longitudinal perspectives

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World Journal of Gastroenterology 2013年第12期19卷 1890-1900页

作者： Beom Kyung kim James Fung man-Fung Yuen Seung Up kim Department of Internal Medicine Institute of Gastroenterology Yonsei University College of Medicine Liver Cirrhosis Clinical Research Center Department of Medicine State Key Laboratory for Liver Research the University of Hong Kong

Accurate determination of the presence and degree of fibrosis in liver is of great importance, because the prognosis and management strategies for chronic liver disease depend mainly on these factors. To date, liver biopsy (LB) remains the "gold standard" for assessing the severity of liver fibrosis; however, LB is often limited by its invasiveness, sampling error, and intra/ inter-observer variability in histological interpretation. Furthermore, repeated LB examinations within a short time interval are indeed ineligible in a real clinical practice. Thus, due to the pressing need for non-invasive surrogates for liver fibrosis, transient elastography (TE),as a novel ultrasound based technology, has allowed a noninvasive measurement of liver stiffness and has gained in popularity over recent years. In the past few years, additional roles for transient TE beyond the initial purpose of a non-invasive surrogate for LB have included the prediction of the most two critical consequences of fibrosis progression: the development of portal hypertension-related complications and hepatocellular carcinoma. This indicates that the role of transient TE is not merely limited to reducing the need for LB, but transient TE can enable the establishment of tailored management strategies by providing more detailed prognostic information. In particular, under the concept in which the clinical course of liver fibrosis is dynamic and bidirectional, especially when appropriate intervention is commenced, transient TE can be used to track the dynamic changes in fibrotic burden during antiviral or antifibrotic treatment. This review discussed extended applications of transient TE in prediction of the development of real clinical endpoints from a longitudinal perspective.

关键词： Liver stiffness Transient elastography Fibroscan Fibrosis Longitudinal Outcome