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지속가능 엔지니어링을 위한 PLM 시스템의 개념 설계에 관한 연구
Wen-Bin Zhao,노상도(Sang Do Noh) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
PLM, Product Lifecycle Management 는 초기 제품 기획 단계인 고객 요구사항 파악에서부터 유지관리, 복구의 마지막 단계까지 제품의 전 라이프 사이클에 걸쳐 관련된 정보를 통합적으로 관리하는 것으로, 신속한 제품 개발과 협업 달성 등 제조업이 당면한 다양한 요구를 만족시킬 수 있는 새로운 패러다임이다. 일반적으로 PLM 에서는 제조과정에서 발생 가능한 문제점을 사전에 파악하여 비용과 시간을 최소화하고, 기술과 서비스 지원을 통한 생산성 향상을 추구하고 있다. 그러나, 근래에 들어 산업화 이후 문명을 지탱하고 있는 자원의 일방적 채취와 소비가 더 이상 인간의 번영을 보장 할 수 없다는 인식이 확산되고 있으며, 화석 연료를 기반으로 하는 직선적인 생산 및 소비 형태의 한계와 문제점이 드러나고 있다. 그 결과 저탄소 녹색성장, 청정생산, 친환경 제품 등의 이슈화가 본격적으로 진행되고 있으며, 제조 기업에서도 지속가능한 발전은 향후 산업 발전의 주요한 추진 방향으로 잡게 되었다. 본 논문에서는 제조 기업에서 기존의 제품, 생산 엔지니어링과 함께 지속가능 엔지니어링 수행을 지원하는 새로운 PLM 의 정보모델을 연구하였으며, PLM 시스템의 개념 설계를 진행하였다.
웹 기반 수준진단 시스템을 통한 맞춤형 생산정보화 도입 가이드라인에 관한 연구
Wen-Bin Zhao,이주연(Ju Yeon Lee),노상도(Sang Do Noh),조현제(Hyun Jei Jo),조용주(Yong Ju Jo),최석우(Seog Ou Choi) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
제조기업이 생산정보화시스템(MES) 도입 시, 기업별로 생산환경의 특성이 모두 반영된 정보화로 추진되어야 하는 관계로 대기업과는 달리 중소기업에서 도입하는 데에 많은 어려움을 겪고 있다. 일반적으로 국내의 중소형 제조기업에서 MES 를 도입할 때 기업의 생산환경 특성을 반영하는 업종이나 규모, 생산방식 및 주문방식 등 요소를 고려하지 않고 획일적인 전략을 기반으로 도입을 하고 있으며, 이로 인해 도입 후에도 시스템이 제대로 활용되지 못하고 일부의 간단한 기능만을 사용하게 되거나, 이로 인한 사용자의 만족도가 낮아지는 등의 많은 문제점이 발생하고 있다. 본 논문에서는 생산정보화시스템(MES)의 효율적인 도입을 위해 웹 기반의 정보화 수준 진단시스템을 이용한 생산정보화의 보급/확산 전략을 도출한다. 또한 웹 포털 상에서 이해하기 쉽고 간단한 대화형식의 질문을 통해 해당 기업의 수준과 필요를 도출하여 맞춤형 생산정보화시스템(MES) 도입 가이드라인을 제시한다.
Dynamic Analysis and Design Calculation Methods for Powertrain Mounting Systems
Wen-Bin Shangguan,Zhao Yinyan 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.6
A method for dynamic analysis and design calculation of a Powertrain Mounting System (PMS) including Hydraulic Engine Mounts (HEM) is developed with the aim of controlling powertrain motion and reducing low-frequency vibration in pitch and bounce modes. Here the pitch mode of the powertrain is defined as the mode rotating around the crankshaft of an engine for a transversely mounted powertrain. The powertrain is modeled as a rigid body connected to rigid ground by rubber mounts and/or HEMs. A mount is simplified as a three-dimensional spring with damping elements in its Local Coordinate System (LCS). The relation between force and displacement of each mount in its LCS is usually nonlinear and is simplified as piecewise linear in five ranges in this paper. An equation for estimating displacements of the powertrain center of gravity (C.G.) under static or quasi-static load is developed using Newton’'s second law, and an iterative algorithm is presented to calculate the displacements. Also an equation for analyzing the dynamic response of the powertrain under ground and engine shake excitations is derived using Newton’'s second law. Formulae for calculating reaction forces and displacements at each mount are presented. A generic PMS with four rubber mounts or two rubber mounts and two HEMs are used to validate the dynamic analysis and design calculation methods. Calculated displacements of the powertrain C.G. under static or quasi-static loads show that a powertrain motion can meet the displacement limits by properly selecting the stiffness and coordinates of the tuning points of each mount in its LCS using the calculation methods developed in this paper. Simulation results of the dynamic responses of a powertrain C.G. and the reaction forces at mounts demonstrate that resonance peaks can be reduced effectively with HEMs designed on the basis of the proposed methods.
Deep-blue organic light-emitting diodes based on multi-tert-butyl modified naphthylene
Bin Wei,Hanfei Xu,Ning Zhao,Xicun Gao,Yiteng Ye,Yingnan Wang,Dengli Yao,Xiao-Wen Zhang,Xiujuan Liu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
Six tert-butyls modified naphthyl derivative (2,6-di-tert-butyl-1,5-bis-(3,5-di-tert-butyl-phenyl)-naphthalene (N(dtb)4) was synthesized and tested for host and guest materials in organic light-emittingdiodes (OLEDs). Blue OLED using N(dtb)4 as a host and an emitter DSA-PH as a guest reaches an efficiencyof 11.52 cd A 1 (maximum external quantum efficiency 7.8 % and maximum power efficiency10.33 lm W 1). In addition, for the OLED with N(dtb)4 being a guest, we find that the concentrations ofN(dtb)4 will also affect the performance of the OLED, among which ADN: 5 wt.% N(dtb)4 has higher efficiency,and the maximum current efficiency, external quantum efficiency (EQE) and power efficiency ofthe device reach 3.75 cd A 1, 3.93 % and 3.36 lm W 1, respectively. We also investigated the pure N(dtb)4-based ultraviolet OLED (UV-OLED), and achieved the maximum EQE of the device is 1.12 %. These resultsindicate that N(dtb)4, a novel synthesized fluorescent organic material, has great potential applications inOLEDs and accordingly advancing lightings and displays.
( Bin Yin ),( Chen Xi Hu ),( Zheng Chen ),( Wen Jun Zhao ),( Li Rong Wei ),( Yan Wen Zheng ),( Chao He ),( Yan Zeng ) 한국응용약물학회 2014 Biomolecules & Therapeutics(구 응용약물학회지) Vol.22 No.2
Vesicular Stomatitis Virus G Glycoprotein and ATRA EnhancedBystander Killing of Chemoresistant Leukemic Cells by HerpesSimplex Virus Thymidine Kinase/Ganciclovir
Wen-Yi Zhang,Xin-Ze Xiao,Chao Lv,Jia Zhao,Gong Wang,Xuan Gu,Ran Zhang,Bin-Bin Xu,Dan-Dan Zhang,Ai-Wu Li,Yong-Lai Zhang,Hong-Bo Sun 한국고분자학회 2013 Macromolecular Research Vol.21 No.3
Reported here is the fabrication of photopolymer hierarchical micronanostructures through a combinative process of electrospinning and subsequent photolithography. Electrospun SU-8 (epoxy-based negative photoresist)nanofiber films have been patterned into gratings with periods of 100, 200, 300, and 400 μm, respectively. Deposition of a silver nanolayer on these interlaced nanofiber films would lead to the formation of various plasmonic nanostructures,and therefore, giving rise to abundant surface-enhanced Raman scattering (SERS) “hot spots”. In the detection of Rhodamine 6G (R6G), probing molecule, the resultant SERS substrates show both high sensitivity and good reproducibility. The SERS enhancement factor could reach as high as ~108, indicating high efficiency. The fabrication of patterned, highly efficient SERS substrates may hold a great promise for the integration of SERS substrates in various microdevices such as microfluidic chips.
Luminescence and photoconductivity properties of porous polycrystalline silicon
Yue Zhao,Dong-sheng Li,Jie Zhao,Wen-bin Sang,De-ren Yang,Min-hua Jiang 한국물리학회 2008 Current Applied Physics Vol.8 No.2
In recent years, the photoluminescence and the photoconductivity of porous silicon were comprehensively studied. But the photoluminescence and the photoconductivity of porous polycrystalline silicon have not been wholely studied. In this paper, the results showed that luminescent property of the samples prepared by poly-crystal silicon wafers may be related to the defects on Si complexes surface, which can be proved by microwave-detected photoconductivity decay measurements. Furthermore, the luminescence of samples was disappeared under the external illumination, which may be related to the elimination of luminescent-centers. In addition, the conductivities of the samples were dependent on etched time and current density, and the large porosity of samples led to isotropic photoconductivity, which may be related to the change of energy band structure of the devices. In recent years, the photoluminescence and the photoconductivity of porous silicon were comprehensively studied. But the photoluminescence and the photoconductivity of porous polycrystalline silicon have not been wholely studied. In this paper, the results showed that luminescent property of the samples prepared by poly-crystal silicon wafers may be related to the defects on Si complexes surface, which can be proved by microwave-detected photoconductivity decay measurements. Furthermore, the luminescence of samples was disappeared under the external illumination, which may be related to the elimination of luminescent-centers. In addition, the conductivities of the samples were dependent on etched time and current density, and the large porosity of samples led to isotropic photoconductivity, which may be related to the change of energy band structure of the devices.
Research on Modeling Improvement of Rubber Isolators by Considering Multi-loading Conditions
Yin-Yan Zhao,Wen-Bin Shangguan,Nong Cheng,Xiao-Jing He 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The stress-strain relationships of a rubber material in uniaxial tension, equi-biaxial tension and plane shear loading conditions are tested here. Constitutive parameters in different constitutive models, such as Mooney-Rivlin model, Van Der Waals model and Marlow model can be obtained by least square method using measured and calculated stress-strain relations. The rubber isolators in two rubber mounts are investigated here. Rubber mount I bears stretching/compression deformation or shear deformation, while mount II bears both deformations simultaneously. Using obtained constitutive constants, the rubber isolators’ static stiffness values in three mutually perpendicular directions are calculated, analyzed and compared with their measured results. Based on Mooney-Rivlin model, the effects of these constitutive constants on static stiffness of the two mounts are discussed by comparison. The effects of different models on static force-displacement characteristics of rubber mount I are also analyzed. The conclusion is that it is necessary to choose a relatively accurate constitutive model and appropriate methods for obtaining the model constants in describing rubber characteristic.