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Dislocation characteristics and dynamic recrystallization in hot deformed AM30 and AZ31 alloys

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Journal of Magnesium and Alloys 2022年第12期10卷 3495-3505页

作者： Hyeon-Woo son Soong-keun Hyun Metallic Materials Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Inha UniversityIncheon 22212Republic of Korea

Zn addition to Mg alloys activates non-basal slip or twinning with solute softening *** the other hand,the effects of the Zn solute on the macroscopic dislocation behavior and dynamic recrystallization are not completely ***,it is unclear ifslip can be affected by changes in the c/a ratio of solute *** study was conducted to understand the solute strengthening of Zn addition and its effects on the dislocation characteristics and dynamic recrystallization.A hot torsion test was performed on both AM30 and AZ31 alloys up to a high strain to investigate the Zn solute effect on the dislocation characteristics and dynamic *** dislocation components of the hot torsioned alloys were evaluated by X-ray line profile analysis and electron backscatter *** results showed that the Zn solutes slightly accelerate strain accumulation at the initial stages of hot deformation,which accelerated recrystallization at high *** dislocation characteristics were changed dynamically by Zn addition:fortified-type slip,dislocation arrangement and strain anisotropy *** most important point was that the dislocation characteristics were changed dramatically at the critical strain for recrystallization and high strain *** addition of Zn also acted greatly in these strain *** indicates that the rapid formation of-type slip at the serrated grain boundaries occurs at the initiation of dynamic recrystallization and the increase in the grain triple junction because grain refinement has a great influence on the dislocation characteristics at high strain.

关键词： Magnesium alloy X-ray line profile Solid solution Dislocation density Dynamic recrystallization

A survey of free space optical networks

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Digital Communications and Networks 2017年第2期3卷 67-77页

作者： In keun son Shiwen Mao Department of Electrical and Computer Engineering Auburn University Auburn AL USA Defense Acquisition Program Administration (DAPA) Republie of Korea

Free Space Optical （FSO） networks, also known as optical wireless networks, have emerged as viable candidates for broadband wireless communications in the near future. The range of the potential application of FSO networks is extensive, from home to satellite. However, FSO networks have not been popularized because of insufficient availability and reliability. Researchers have focused on the problems in the physical layer in order to exploit the properties of wireless optical channels. However, recent technological developments with successful results make it practical to explore the advantages of the high bandwidth. Some researchers have begun to focus on the problems of network and upper layers in FSO networks. In this survey, we classify prospective global FSO networks into three subnetworks and give an account of them. We also present state-of- the-art research and discuss what kinds of challenges exist.

关键词： Wireless access networks Free space optical networks Free space optical communications Network architecture Optical wireless networks Satellite networks

Authentication masking code against DoS of T-MAC protocol

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Journal of Central South University 2013年第7期20卷 1889-1895页

作者： son Young-ho HONG Jin-keun BAE keun-sung Attached Institute of ETRI Division of Information & Communication Baekseok University School of Electrical Engineering & Computer Science Kyungpook National University

Security vulnerability of denial of service (DoS) in time out-medium access control (T-MAC) protocol was discussed and analysis of power consumption at each stage of T-MAC protocol was carried out. For power efficient authentication scheme which can provide reliability, efficiency, and security for a general T-MAC communication, a novel synchronization and authentication scheme using authentication masking code was proposed. Authentication data were repeated and masked by PN sequence. The simulation results show that the proposed approach can provide synchronization and authentication simultaneously for nodes in wireless sensor network (WSN). 63 bits AMC code gives above 99.97% synchronization detection and 93.98% authentication data detection probability in BER 0.031 7.

关键词： time out-medium access control (T-MAC) security vulnerability authentication synchronization authenticationmasking code

Local Energy and Planned Ramping Product Joint Market Based on a Distributed Optimization Method

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CSEE Journal of Power and Energy Systems 2021年第6期7卷 1357-1368页

作者： Zhong Zhang Furong Li Sung-Won Park Sung-yong son Dalian University of Technology DalianChina Department of Electronic and Electrical Engineering University of BathBathU.K. the University of Bath BathU.K. the Department of Electrical and Electronic Engineering Youngsan UniversitySouth Korea Gachon University SeoulSouth Korea

High penetration of renewable energy generation(REG)in the distribution system increases both the power uncertainty at a given interval and the power variation between two *** markets addressing power uncertainty have been widely ***,there is a lack of market mechanisms regarding the power variation of the load and *** paper thus defines a planned ramping(PR)product to follow the net load variation and extends the local energy market to include the trading of PR *** are economically compensated for their PR *** models of dispatchable generators and flexible load aggregators in the joint market are *** solve the market problem in polynomial time,a distributed market clearing method is developed based on the ADMM *** joint market is tested on a modified IEEE 33-bus *** verifies that introducing the PR market can encourage flexible loads to provide more PR service to accommodate the net load *** such,the ramping cost of dispatchable generators is reduced by 29.09%in the test *** planned energy curtailment from REG is also *** computational efficiency of the proposed distributed clearing method is validated by comparing it with a centralized method.

关键词： Distributed market clearing flexible load aggregator local electricity market planned ramping product renewable energy generation

Minimally invasive surgery in gastric cancer

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World Journal of Gastroenterology 2014年第39期20卷 14132-14141页

作者： Sang-yong son Hyung-Ho Kim Department of Surgery Seoul National University Bundang Hospital Seongnam 463-707 South Korea

Minimally invasive surgery for gastric cancer has rapidly gained popularity due to the early detection of early gastric cancer. As advances in instruments and the accumulation of laparoscopic experience increase, laparoscopic techniques are being used for less invasive but highly technical procedures. Recent evidence suggests that the short- and long-term outcomes of minimally invasive surgery for early gastric cancer and advanced gastric cancer are comparable to those of conventional open surgery. However, these results should be confirmed by large-scale multicenter prospective randomized controlled clinical trials.

关键词： Gastric cancer Minimally invasive surgery Laparoscopic gastrectomy

Electrochemical behavior of dental implant system before and after clinical use

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中国有色金属学会会刊：英文版 2009年第4期19卷 846-851页

作者： Chae-Heon CHUNG Hee-Jung KIM yong-Tae JEONG Mee-Kyoung son yong-Hoon JEONG Han-Cheol CHOE Department of Prosthodontics College of DentistryChosun University Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials College of DentistryChosun University

Electrochemical behavior of dental implant system before and after clinical use(in vivo and in vitro) was researched by using abutment and titanium *** simulate an oral environment,the samples of clinically used and non-used implant systems as a working electrode were exposed to artificial saliva at(36.5±1) ℃.Electrochemical tests were carried out using a *** electrochemical test,the corrosion morphology of each sample was investigated by FE-SEM and *** corrosion potential and pitting potential of clinically used implant system are lower than those of non-used implant system,and clinically used implant system exhibits a lower range of passivation,indicating a less degree of inherent resistance against chloride *** polarization resistance decreases in the case of clinically used implant system,whereas,Rp for clinically non-used implant system increases compared with clinically used implant system.

关键词：电化学行为种植制度临床应用使用制度临床使用电化学测试夹具系统腐蚀形态

Corticoreticular tract lesion in children with developmental delay presenting with gait dysfunction and trunk instability

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Neural Regeneration Research 2017年第9期12卷 1465-1471页

作者： yong Min Kwon Jessica Rose Ae Ryoung Kim Su Min son Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Department of Orthopedic Surgery College of Medicine Stanford University

The corticoreticular tract （CRT） is known to be involved in walking and postural control. Using diffusion tensor tractography （DTT）, we investigated the relationship between the CRT and gait dysfunction, includ- ing trunk instability, in pediatric patients. Thirty patients with delayed development and 15 age-matched, typically-developed （TD） children were recruited. Fifteen patients with gait dysfunction （bilateral trunk instability） were included in the group A, and the other 15 patients with gait dysfunction （unilateral trunk instability） were included in the group B. The Growth Motor Function Classification System, Functional Ambulation Category scale, and Functional Ambulation Category scale were used for measurement of functional state. Fractional anisotropy, apparent diffusion coefficient, fiber number, and tract integrity of the CRT and corticospinal tract were measured. Diffusion parameters or integrity of corticospinal tract were not significantly different in the three study groups. However, CRT results revealed that both CRTs were disrupted in the group A, whereas CRT disruption in the hemispheres contralateral to clinical mani- festations was observed in the group B. Fractional anisotropy values and fiber numbers in both CRTs were decreased in the group A than in the group TD. The extents of decreases of fractional anisotropy values and fiber numbers on the ipsilateral side relative to those on the contralateral side were greater in the group B than in the group TD. Functional evaluation data and clinical manifestations were found to show strong correlations with CRT status, rather than with corticospinal tract status. These findings suggest that CRT status appears to be clinically important for gait function and trunk stability in pediatric patients and DTT can help assess CRT status in pediatric patients with gait dysfunction.

关键词： nerve regeneration corticoreticular tract corticospinal tract gait trunk diffusion tensor Trunk Control Measurement Scale Functional Ambulation Category Growth Motor Function Classification System cerebral palsy motor neural regeneration

Asian variant intravascular large B-cell lymphoma with highly suspected central nervous system involvement:A case report

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World Journal of Clinical Cases 2023年第33期11卷 8058-8064页

作者： yong-Pyo Lee Seung-Myoung son Jihyun Kwon Department of Internal Medicine Chungbuk National University HospitalCheongju 28644South Korea Department of Pathology Chungbuk National University HospitalChungbuk National University College of MedicineCheongju 28644South Korea

BACKGROUND Intravascular large B-cell lymphoma(IVLBCL)is a rare subtype of extranodal *** particular,the Asian variant of IVLBCL is characterized by hemophagocytic lymphohistiocytosis along with bone marrow ***,central nervous system(CNS)involvement is uncommon in this variant compared to the Western ***,we report a case of typical Asian variant IVLBCL with highly suspected CNS involvement and discuss the nature of the disease and its genetic *** SUMMARY A 67-year-old female patient complained of gradually worsening cognitive *** hospitalized,she developed a high fever and showed marked *** imaging revealed a suspected leptomeningeal *** no malignant cells were found in the cerebrospinal fluid(CSF),the protein and lactate dehydrogenase levels in CSF were *** marrow examination revealed an increased number of hemophagocytic histiocytes,and 18F-fluorodeoxyglucose(FDG)positron emission tomography with computerized tomography scan revealed increased FDG uptake in both adrenal glands,the liver,and the right ethmoid sinus.A tissue biopsy showed atypical large lymphoid cells with prominent nucleoli in the vessels,and the tumor cells were positive for CD20,BCL2,BCL6,and IRF4/*** addition,targeted sequencing identified MYD88,TET2,and PIM1 ***,we diagnosed the patient with the Asian variant of IVLBCL with highly suspected CNS *** Suspicion of IVLBCL and immediate diagnosis lead to timely ***,careful CNS examination at diagnosis is recommended.

关键词： Intravascular large B-cell lymphoma Asian variant Hemophagocytic lymphohistiocytosis Central nervous system involvement Genetic alteration Case report

Effects of Li addition on microstructure and mechanical properties of Mg-6Al-2Sn-0.4Mn alloys

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Transactions of Nonferrous Metals Society of China 2016年第3期26卷 697-703页

作者： yong-Ho KIM Hyeon-Taek son Automotive Component & Materials R&BD Group Korea Institute of Industrial TechnologyGwangju 61012Korea Department of Rare Metals Engineering University of Science & TechnologyDaejeon 34113Korea

Effects of Li addition (2%, 5%, 8% and 11%) on microstructure and mechanical properties of the as-cast and as-extruded Mg?6Al?2Sn?0.4Mn-based alloys were investigated. Mg?xLi?6Al?2Sn?0.4Mn (x= 2, 5, 8 and 11, mass fraction, %) alloys were cast under an SF6 and CO2 atmosphere at 700 °C. After homogenization heat treatment at 350 °C, cast billets were extruded with a reduction ratio of 40:1 at 200 °C. Li addition to Mg?6Al?2Sn?0.4Mn resulted in the formation of MgSnLi2 and MgAlLi2 and/or AlLi intermetallic compounds and random basal texture. With increasing Li addition,β-Li phase was increased and the average area fraction of precipitates increased. Compression yield strength was increased from 212 to 235, 242 and 239 MPa as Li content was increased from 2% to 5%, 8% and 11%, respectively. Elongation was remarkably increased above 60% in 11% Li alloy. It is probable that Li-containing phases play a significant role in the enhanced mechanical properties by Li addition.

关键词： magnesium alloy Li addition extrusion microstructure mechanical property