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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

High mobility group box 1 in the central nervous system:regeneration hidden beneath inflammation

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Neural Regeneration Research 2025年第1期20卷 107-115页

作者： Hanki Kim Bum jun Kim Seungyon Koh Hyo Jin Cho Xuelian Jin Byung Gon Kim jun young choi Department of Brain Science Ajou University School of MedicineSuwonSouth Korea Department of Biomedical Sciences Ajou University Graduate School of MedicineSuwonSouth Korea Department of Neurology Ajou University School of MedicineSuwonSouth Korea Department of Geriatrics The Affiliated Suqian First People’s Hospital of Nanjing Medical UniversitySuqianJiangsu ProvinceChina

High-mobility group box 1 was first discovered in the calf thymus as a DNA-binding nuclear protein and has been widely studied in diverse fields,including neurology and ***-mobility group box 1 in the extracellular space functions as a pro-inflammatory damage-associated molecular pattern,which has been proven to play an important role in a wide variety of central nervous system disorders such as ischemic stroke,Alzheimer’s disease,frontotemporal dementia,Parkinson’s disease,multiple sclerosis,epilepsy,and traumatic brain *** drugs that inhibit high-mobility group box 1 as a damage-associated molecular pattern,such as glycyrrhizin,ethyl pyruvate,and neutralizing anti-high-mobility group box 1 antibodies,are commonly used to target high-mobility group box 1 activity in central nervous system *** it is commonly known for its detrimental inflammatory effect,high-mobility group box 1 has also been shown to have beneficial pro-regenerative roles in central nervous system *** this narrative review,we provide a brief summary of the history of high-mobility group box 1 research and its characterization as a damage-associated molecular pattern,its downstream receptors,and intracellular signaling pathways,how high-mobility group box 1 exerts the repair-favoring roles in general and in the central nervous system,and clues on how to differentiate the pro-regenerative from the pro-inflammatory *** targeting high-mobility group box 1 in the central nervous system may benefit from differentiating between the two functions rather than overall suppression of high-mobility group box 1.

关键词： central nervous system damage-associated molecular pattern ethyl pyruvate glycyrhizzin high mobility group box 1 inflammation neural stem cells neurodevelopment oligodendrocyte progenitor cells redox status regeneration

Apolipoprotein A-I binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

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Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan choi Soo-Ho choi Keun-young Kim Yury I.Miller Won-Kyu Ju Hamilton Glaucoma Center and Shiley Eye Institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and Imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

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韩国跆拳道教练员指导行为分析

军事体育进修学院学报 2010年第4期29卷 52-54页

作者：焉石崔宽容崔永俊哈尔滨工程大学体育军事训练部黑龙江哈尔滨150001 韩国体育大学

通过运用Arizona大学的观察体系方法,对韩国跆拳道教练员在训练过程中的指导行为进行了分析归纳。结果表明:韩国跆拳道教练员在平时训练时的指导行为大致可以归纳为几个方面:技术指导、动作意见反馈、选手管理等方面。通过归纳分析跆拳... 详细信息

通过运用Arizona大学的观察体系方法,对韩国跆拳道教练员在训练过程中的指导行为进行了分析归纳。结果表明:韩国跆拳道教练员在平时训练时的指导行为大致可以归纳为几个方面:技术指导、动作意见反馈、选手管理等方面。通过归纳分析跆拳道强国韩国队教练员的指导行为,为我国的跆拳道项目日后更好地发展提供参考。

关键词：跆拳道指导行动

Online Approach for Spatio-Temporal Trajectory Data Reduction for Portable Devices

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Journal of Computer Science & Technology 2013年第4期28卷 597-604页

作者： Heemin Park young-jun Lee Jinseok Chae Wonik choi Department of Computer Software Engineering Sangmyung University Department of Computer Science and Engineering Incheon National University School of Information and Communication Engineering Inha University

As location data are widely available to portable devices, trajectory tracking of moving objects has become an essential technology for most location-based services. To maintain such streaming data of location updates from mobile clients, conventional approaches such as time-based regular location updating and distance-based location updating have been used. However, these methods suffer from the large amount of data, redundant location updates, and large trajectory estimation errors due to the varying speed of moving objects. In this paper, we propose a simple but efficient online trajectory data reduction method for portable devices. To solve the problems of redundancy and large estimation errors, the proposed algorithm computes trajectory errors and finds a recent location update that should be sent to the server to satisfy the user requirements. We evaluate the proposed algorithm with real GPS trajectory data consisting of 17 201 trajectories. The intensive simulation results prove that the proposed algorithm always meets the given user requirements and exhibits a data reduction ratio of greater than 87% when the acceptable trajectory error is greater than or equal to 10 meters.

关键词： online trajectory sampling moving object tracking data reduction location-based service

Effects of inter-electrode insertion on the performance and thermal flow fields of a hollow-electrode plasma torch

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Plasma Science and Technology 2020年第1期22卷 33-44页

作者： In-Mok YANG jun-Seok NAM Min-Kyu choi jun-Ho SEO Shi-young YANG Department of Applied Plasma Engineering Chonbuk National UniversityJeonju 54896Republic of Korea Graduate School of Flexible&Printable Electronics Chonbuk National UniversityJeonju 54896Republic of Korea

The effects of lntcr-ckxttxxk insertion on the performance of a hollow--electrode plasma torch have been investigated by numerical *** results revealed that when inter-dcctrodes arc inserted,the arc voltages and plasma powers increase due to the increase in the arc *** addition,it was predicted that thermal efficiency can be improved with the increase in plasma power by injecting plasma gases through the gaps between *** unique effects of inter-electrode insertion arc a result of the plasma temperatures adjusting themselves to increase arc voltages when the arc column is contracted radially by increasing gas-flow rate or decreasing inter-electrcxk diameter.

关键词： hollow-electrode plasma torch inter-electrodes numerical analysis torch performance

A comparative study of interface reconstruction algorithms in molten metal flow

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China Foundry 2013年第1期10卷 50-56页

作者： young-Sim choi jun-Ho Hong Ho-young Hwang e-Design Center Korea Institute of Industrial TechnologyIncheon 406-840Korea

In the present research,two numerical schemes for improving the accuracy of the solution in the flow simulation of molten metal were *** method is the Piecewise Linear Interface Calculation(PLIC) method and the other is the Donor-Acceptor(D-A) *** verify the module of the interface reconstruction algorithms,simple problems were *** these validations,the accuracy and efficiency of these two methods were compared by simulating various real *** the numerical simulation of free surface flow,it is possible for the PLIC method to track very accurately the interface between *** PLIC method,however,has the weak point in that a lot of computational time is required,though it shows the more accurate interface *** Donor-Acceptor method has enough effectiveness in the macro-observation of a mold filling sequence though it shows inferior ***,for the problems that need the accurate solution,PLIC is more appropriate than *** accuracy may cause less efficiency in numerical *** method between D-A method and PLIC method should be chosen depends on the product.

关键词： interface reconstruction DA PLIC molten metal flow accuracy volume of fluid method

Diagnosis parameters of mold filling pattern for optimization of a casting system

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China Foundry 2012年第4期9卷 376-380页

作者： jun-Ho Hong young-Sim choi Ho-young Hwang e-Design Center Korea Institute of Industrial Technology e-Design Center Korea Institute of Industrial TechnologyIncheonKorea

For optimal design of a gating system,the setting of diagnosis parameters is very *** this study,the permanent mold casting process was selected because most of the other casting processes have more complicated factors that influence the mold filling pattern compared to the permanent mold casting process,such as the surface roughness of mold,gas generation from the mold wash and binder of sand mold,and the gas permeability through a sand mold,*** diagnosis parameters(flow rate difference and arrival time difference) of molten metal flow pattern in the numerical simulation are suggested for design of an optimum casting system with a permanent *** results show that the arrival time difference can be used as one important diagnosis parameter of the complexity of the runner system and its usefulness has been verified via making aluminum parts using permanent mold casting(Fig.9).

关键词： mold filling pattern optimum casting system diagnosis parameter permanent mold casting process

Modeling subcortical ischemic white matter injury in rodents:unmet need for a breakthrough in translational research

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Neural Regeneration Research 2021年第4期16卷 638-642页

作者： Yuexian Cui Xuelian Jin jun young choi Byung Gon Kim Department of Brain Science Ajou University School of MedicineSuwonKorea Neuroscience Graduate Program Department of Biomedical SciencesAjou University Graduate School of MedicineSuwonKorea Department of Neurology Ajou University School of MedicineSuwonKorea Department of Neurology Yanbian University HospitalYanjiJilin ProvinceChina Department of Nephrology Suqian First HospitalSuqianJiangsu ProvinceChina

Subcortical ischemic white matter injury(SIWMI),pathological correlate of white matter hyperintensities or leukoaraiosis on magnetic resonance imaging,is a common cause of cognitive decline in *** its high prevalence,it remains unknown how various components of the white matter degenerate in response to chronic *** incomplete knowledge is in part due to a lack of adequate animal *** current review introduces various SIWMI animal models and aims to scrutinize their advantages and disadvantages primarily in regard to the pathological manifestations of white matter *** SIWMI animal models are categorized into 1)chemically induced SIWMI models,2)vascular occlusive SIWMI models,and 3)SIWMI models with comorbid vascular risk *** induced models display consistent lesions in predetermined areas of the white matter,but the abrupt evolution of lesions does not appropriately reflect the progressive pathological processes in human white matter *** occlusive SIWMI models often do not exhibit white matter lesions that are sufficiently unequivocal to be *** combined with comorbid vascular risk factors(specifically hypertension),however,they can produce progressive and definitive white matter lesions including diffuse rarefaction,demyelination,loss of oligodendrocytes,and glial activation,which are by far the closest to those found in human white matter hyperintensities ***,considerable surgical mortality and unpredictable natural deaths during a follow-up period would necessitate further refinements in these *** the meantime,in vitro SIWMI models that recapitulate myelinated white matter track may be utilized to study molecular mechanisms of the ischemic white matter *** in vivo and in vitro SIWMI models will contribute in a complementary manner to making a breakthrough in developing effective treatment to prevent progression of white matter hyperintensities.

关键词： animal model axonal degeneration demyelination hypertension ischemia oligodendrocytes subcortical ischemic white matter injury vascular cognitive impairment white matter hyperintensities