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Improvement of machining quality of copper-plated roll mold by controlling temperature variation

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 37-41页

作者： Tae-Jin JE Eun-Chae JEON Sang-Cheon PARK Doo-Sun CHOI kyung-hyun whang Myung-Chang KANG Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Daejeon 305-343 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.

关键词：模具加工温度控制器加工质量温度变化镀铜螺距误差热膨胀量微棱镜

Influence of tool deflection on micro channel pattern of 6:4 brass with rectangular tool

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中国有色金属学会会刊：英文版 2009年第B9期19卷 164-170页

作者： Tae-Jin JE Kang-Won LEE Sang-Cheon PARK Jae-Gu KIM Doo-Sun CHOI Kyoung-Taik PARK kyung-hyun whang Nano Mechanical Systems Research Division Korea Institute of Machinery & Materials (KIMM)

Machining experiment of micro channel structure with 6:4 brass was carried out by shaping process using a single crystal diamond tool. FEM simulation using solid cantilever beam model was analyzed. In result of experiment, tool deflection is observed as machining characteristics through result of experiments such as surface roughness, cutting force and burr formations. And the influence of tool deflection is experimentally proved.

关键词：金刚石工具挠度通道模式黄铜矩形实验证明加工特性有限元模拟

Machining characteristics of complex prism pattern on electroplated roll by copper

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中国有色金属学会会刊：英文版 2009年第B9期19卷 288-294页

作者： Tae-Jin JE Sang-Cheon PARK Kang-Won LEE Yeong-Eun YOO Doo-Sun CHOI kyung-hyun whang Myung-Chang KANG Nano-Machining Laboratory Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Nano-Mechatronics Department University of Science and TechnologySinseongnoYouseong-GuDaejeonKorea National Core Research Center for Hybrid Materials Solution Pusan National University

The BLU (back light unit) is the core component of the LCD for notebook, mobile-phone, navigation, as well as large sized TV, PID (public information display), etc. In order to enhance optical efficiency of LCD, optical films with the uniform prism patterns have been used for BLU by stacking two films up orthogonally. In this case, light interference-phenomenon occurred such as Morie, wet-out, u-turning, etc. It caused several problems such as low brightness, spots and stripes in LCD. Recently, the high-luminance micro complex prism patterns are actively studied to avoid the light interference-phenomenon and enhance the optical efficiency. In this study, the roll master to manufacture complex micro prism pattern film was machined by using the high precision lathe. The machined patterns on the roll master were 50, 45, 40, 35, 30, 25, 20, 15, 10 and 5 μm in the pitch with 25.0, 22.5, 20.0, 17.5, 15.0, 12.5, 10.0, 7.5, 5.0 and 2.5 μm in the peak height, respectively. The roll was 2 000 mm in length and 320 mm in diameter. The electroplated roll by copper and the natural single crystal diamond tool was used for machining the patterns. The cutting force was measured and analyzed for each cutting condition by using the dynamometer. The chips and the surfaces after being machined were analyzed by SEM and microscope.

关键词：车床加工微棱镜铜电镀特征光学效率光学薄膜笔记本电脑金刚石工具

Exploring the relationship-oriented spaces of social networks and depressive symptoms among older adults

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Frontiers of Architectural Research 2024年第1期13卷 112-126页

作者： Yongming Yang Heejoon whang Department of Architecture Hanyang UniversitySeoul 04763Republic of Korea

The Republic of Korea has the highest suicide rate of older population among OECD countries,and depression is the prevailing *** it is well-known that the urban physical environment affects mental health,research on the physical characteristics of spaces remains *** study aims to explore relationship-oriented space characteristics that can form social networks and reduce depressive symptoms in older *** analyzing the differences in social interaction spaces between high-density and low-density areas for older adults in Seoul,we identified social interaction spaces(parks and traditional markets)that are frequently used based on on-site interview *** areas were selected for the questionnaire *** main findings revealed that older adults living in areas with diverse spatial planning and close physical relationships between parks and traditional markets,convenient pedestrian environments,and lower population density of older adults had better social networks and lower depressive *** significantly,the physical characteristics of parks and traditional markets(convenient accessibility,maximized visibility,connectivity,and territoriality)significantly facilitate social *** engaging in social interactions within these spaces exhibited significantly better social networks and lower depressive *** findings underscore the importance of considering relationship-oriented space characteristics in spatial and urban planning.

关键词： Relationship-oriented spaces Social networks Depressive symptoms High-density areas Older adults

Empathic Responses of Behavioral-Synchronization in Human-Agent Interaction

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Computers, Materials & Continua 2022年第5期71卷 3761-3784页

作者： Sung Park Seongeon Park Mincheol whang Savannah College of Art and Design SavannahGA31401USA Sangmyung University Seoul03016Korea

Artificial entities,such as virtual agents,have become more *** long-term presence among humans requires the virtual agent’s ability to express appropriate emotions to elicit the necessary empathy from the *** empathy involves behavioral mimicry,a synchronized co-movement between dyadic ***,the characteristics of such synchrony between humans and virtual agents remain unclear in empathic *** study evaluates the participant’s behavioral synchronization when a virtual agent exhibits an emotional expression congruent with the emotional context through facial expressions,behavioral gestures,and *** viewed an emotion-eliciting video stimulus(negative or positive)with a virtual *** participants then conversed with the virtual agent about the video,such as how the participant felt about the *** virtual agent expressed emotions congruent with the video or neutral emotion during the *** participants’facial expressions,such as the facial expressive intensity and facial muscle movement,were measured during the dialog using a *** results showed the participants’significant behavioral synchronization(i.e.,cosine similarity≥.05)in both the negative and positive emotion conditions,evident in the participant’s facial mimicry with the virtual ***,the participants’facial expressions,both movement and intensity,were significantly stronger in the emotional virtual agent than in the neutral virtual *** particular,we found that the facial muscle intensity of AU45(Blink)is an effective index to assess the participant’s synchronization that differs by the individual’s empathic capability(low,mid,high).Based on the results,we suggest an appraisal criterion to provide empirical conditions to validate empathic interaction based on the facial expression measures.

关键词： Facial emotion recognition facial expression virtual agent virtual human embodied conversational agent empathy human-computer interaction

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预压缩气垫包装系统静力及动力学特性研究

包装工程 2024年第1期45卷 290-298页

作者：李广利李玲张滔卞强王栋彬刘新丽中国航天员科研训练中心北京100094 人因工程全国重点实验室北京100094

目的以柱形气垫包装系统为研究对象,建立静力及动力学模型,对静态压缩、自由振动和基础激励受迫振动特性进行研究。方法建立气柱压缩力数学模型,并通过试验、仿真验证模型,通过建立预压缩柱形气垫包装系统力学模型,研究静力及动力学特... 详细信息

目的以柱形气垫包装系统为研究对象,建立静力及动力学模型,对静态压缩、自由振动和基础激励受迫振动特性进行研究。方法建立气柱压缩力数学模型,并通过试验、仿真验证模型,通过建立预压缩柱形气垫包装系统力学模型,研究静力及动力学特性。结果预压缩量和充气压力越大,包装系统固有频率越高。在包装对象宽度定值约束下,选取多个小直径气柱,固有频率更高,且薄膜应力更小。在基础激励下,包装系统固有频率处存在共振峰值,对高频域气垫表现出了较好的减振特性。结论所建立的静力压缩模型与试验、仿真结果较吻合,所建立的动力学模型合理,结果准确。

关键词：柱形气垫预压缩模型动力学模型动力学特性

颅内Rosai-Dorfman病的单中心治疗经验

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中华神经外科疾病研究杂志 2024年第1期18卷 76-79页

作者：夏鸣李亚宾汪永新秦虎新疆医科大学第一附属医院神经外四科新疆乌鲁木齐830002.新疆医科大学第一附属医院神经外三科新疆乌鲁木齐83000

Rosai-Dorfman病(Rosai-Dorfman disease)是一种非肿瘤性淋巴组织增生性疾病,由Rosai和Dorfman于1969年首次报道^([1]).RDD患者的主要临床表现为体表淋巴结的增大,伴有或不伴有间歇性发热、盗汗和体重减轻等^([2]).大约有40%的RDD发生... 详细信息

Rosai-Dorfman病(Rosai-Dorfman disease)是一种非肿瘤性淋巴组织增生性疾病,由Rosai和Dorfman于1969年首次报道^([1]).RDD患者的主要临床表现为体表淋巴结的增大,伴有或不伴有间歇性发热、盗汗和体重减轻等^([2]).大约有40%的RDD发生在淋巴结外^([6]).累及颅内的RDD十分罕见,约占结外RDD的10%,颅内RDD的主要病变位于颅底,骨与硬脑膜接触的部分,未发现累及脑实质的RDD报道^([3-5]).

关键词：颅内Rosai-Dorfman病颅骨骨瘤脑膜瘤手术治疗误诊

Low-Programmable-Voltage Nonvolatile Memory Devices Based on Omega-shaped Gate Organic Ferroelectric P(VDF-TrFE) Field Effect Transistors Using p-type Silicon Nanowire Channels

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Nano-Micro Letters 2015年第1期7卷 35-41页

作者： Ngoc Huynh Van Jae-hyun Lee Dongmok whang Dae Joon Kang Department of Physics Institute of Basic SciencesSungkyunkwan University School of Advanced Materials Science and Engineering SKKU Advanced Institute of Nanotechnology Sungkyunkwan University

A facile approach was demonstrated for fabricating high-performance nonvolatile memory devices based on ferroelectric-gate field effect transistors using a p-type Si nanowire coated with omega-shaped gate organic ferroelectric poly(vinylidene fluoride-trifluoroethylene)(P(VDF-Tr FE)). We overcame the interfacial layer problem by incorporating P(VDF-Tr FE) as a ferroelectric gate using a low-temperature fabrication process. Our memory devices exhibited excellent memory characteristics with a low programming voltage of ±5 V, a large modulation in channel conductance between ON and OFF states exceeding 105, a long retention time greater than 3 9 104 s, and a high endurance of over 105 programming cycles while maintaining an ION/IOFFratio higher than 102.

关键词： Si nanowires Field effect transistor Ferroelectric memory

多层级精细化的森林资源资产清查价格体系构建

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自然资源学报 2024年第1期39卷 140-152页

作者：王佳雪陈奕云赖峰张哲乐熊增连郑敏乔占明余珮珩武汉大学资源与环境科学学院武汉430072 青海省自然资源综合调查监测院西宁810001

针对当前森林资源资产清查价格体系建设中国家级均质区划分粗略、价格修正方法不完善、难以适用于多层级管理等不足,在融合使用森林现状属性、统计资料及遥感监测等多源数据的基础上,提出以价格信号数据条件情景判定为支撑,以清查工作... 详细信息

针对当前森林资源资产清查价格体系建设中国家级均质区划分粗略、价格修正方法不完善、难以适用于多层级管理等不足,在融合使用森林现状属性、统计资料及遥感监测等多源数据的基础上,提出以价格信号数据条件情景判定为支撑,以清查工作目标导向的省级均质区划分为核心,涵盖多层级价格修正方法与精细化资源类型价格修正因子的森林资源资产清查价格体系构建框架。并结合青海省清查工作实例,基于35万图斑的森林资源现状调查成果和卫星遥感等多源数据,实现了省、县两级四类林地十余种林木精细化价格体系的实证构建。提出的多层级精细化的价格体系框架构建思路及实证成果,可为中国森林资源资产的高质量管理提供询证决策支持。

关键词：森林资源资产自然资源资产清查自然资源资产价格体系均质区