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排序方式: 共有96条查询结果,搜索用时 281 毫秒
1.
Park Sangwon Nam Hyunbin Na Youngsang Kim Hyoungseop Moon Younghoon Kang Namhyun 《Metals and Materials International》2020,26(5):641-649
Metals and Materials International - This study investigated the influence of the initial grain size on the plastic deformation and tunnel defects that occurred from friction stir welding of... 相似文献
2.
Juyoung Wy Sangwon Jeong Byung-In Kim Junhyuk Park Jaejoon Shin Hyunjoong Yoon Sujeong Lee 《Computers & Industrial Engineering》2011
Simulation has been used to evaluate various aspects of manufacturing systems. However, building a simulation model of a manufacturing system is time-consuming and error-prone because of the complexity of the systems. This paper introduces a generic simulation modeling framework to reduce the simulation model build time. The framework consists of layout modeling software and a data-driven generic simulation model. The generic simulation model was developed considering the processing as well as the logistics aspects of assembly manufacturing systems. The framework can be used to quickly develop an integrated simulation model of the production schedule, operation processes and logistics of a system. The framework was validated by developing simulation models of cellular and conveyor manufacturing systems. 相似文献
3.
Sung-Jae Joo Sangwon Baek Sang-Cheol Kim Jeong-Soo Lee 《Journal of Electronic Materials》2013,42(10):2897-2904
In this work, Ti/Ni bilayer contacts were fabricated on both p +- and n +-4H-SiC formed by ion implantation, and the effects of the Ti interlayer on the contact resistance and interfacial microstructure were studied. Adoption of a thin (10 nm) Ti interlayer resulted in specific contact resistance of 4.8 μΩ cm2 and 1.3 mΩ cm2 on n +- and p +-4H-SiC, respectively, comparable to the values for contacts using only Ni. Moreover, contacts using Ti/Ni provide a flat and uniform interface between Ni2Si and SiC, whereas discontinuous, agglomerated Ni2Si islands are formed without the use of a Ti interlayer. In addition, the Ti interlayer was demonstrated to effectively dissociate the thin oxide film on SiC, which is advantageous for low-resistance, reliable ohmic contact formation. In summary, use of a Ti/Ni bilayer is a promising solution for one-step formation of ohmic contacts on both p +- and n +-4H-SiC, being especially suitable for SiC n-channel metal-oxide-semiconductor field-effect transistor (nMOSFET) fabrication. 相似文献
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To enhance workplace safety in the construction industry it is important to understand interrelationships among safety risk factors associated with construction accidents. This study incorporates the systems theory into Heinrich's domino theory to explore the interrelationships of risks and break the chain of accident causation. Through both empirical and statistical analyses of 9358 accidents which occurred in the U.S. construction industry between 2002 and 2011, the study investigates relationships between accidents and injury elements (e.g., injury type, part of body, injury severity) and the nature of construction injuries by accident type. The study then discusses relationships between accidents and risks, including worker behavior, injury source, and environmental condition, and identifies key risk factors and risk combinations causing accidents. The research outcomes will assist safety managers to prioritize risks according to the likelihood of accident occurrence and injury characteristics, and pay more attention to balancing significant risk relationships to prevent accidents and achieve safer working environments. 相似文献
6.
Mark Woh Yuan Lin Sangwon Seo Scott Mahlke Trevor Mudge 《Journal of Signal Processing Systems》2011,63(1):83-94
Commercial and research work in the field of software defined radio (SDR) has produced designs which have been able to deliver
the efficiency and computational power needed to process 3G wireless technologies. Though efficient 3G processing has been
achieved by these designs, next generation 4G SDR technology requires 10–1000x more computational performance but limits the
power budget increase to 2–5x. In this paper, we present a breakdown of the major 4G kernels and analyze two methods of increasing
performance and reducing power consumption. Specifically, we consider the effect of SIMD width and reduction in number of
register file accesses on the performance and energy consumption of a SDR architecture, SODA. We show that by increasing SIMD
width we can gain almost 2–8x performance increase while increasing total energy used by 1–2x for different SIMD widths. We
also show that by reducing SIMD register accesses we can reduce the total energy used by 5–20% for the 4G kernels. 相似文献
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9.
Sangwon Hong Saeil Lee Sangook Jun Dong-Ho Lee Hyungmin Kang Young-Seok Kang Soo-Seok Yang 《Journal of Mechanical Science and Technology》2011,25(3):731-740
Reliability-based design optimization (RBDO) of the NASA stage 37 axial compressor is performed using an uncertainty model
for stall margin in order to guarantee stable operation of the compressor. The main characteristics of RBDO for the axial
compressor are summarized as follows: First, the values of mass flow rate and pressure ratio in stall margin calculation are
defined as statistical models with normal distribution for consideration of the uncertainty in stall margin. Second, Monte
Carlo Simulation is used in the RBDO process to calculate failure probability of stall margin accurately. Third, an approximation
model that is constructed by an artificial neural network is adopted to reduce the time cost of RBDO. The present method is
applied to the NASA stage 37 compressor to improve the reliability of stall margin with both maximized efficiency and minimized
weight. The RBDO result is compared with the deterministic optimization (DO) result which does not include an uncertainty
model. In the DO case, stall margin is slightly higher than the reference value of the required constraint, but the probability
of stall is 43%. This is unacceptable risk for an aircraft engine, which requires absolutely stable operation in flight. However,
stall margin obtained in RBDO is 2.7% higher than the reference value, and the probability of success increases to 95% with
the improved efficiency and weight. Therefore, RBDO of the axial compressor for aircraft engine can be a reliable design optimization
method through consideration of unexpected disturbance of the flow conditions. 相似文献
10.
Duong Nguyen Minh Sangwon Eom Lan Anh Thi Nguyen Juwon Kim Jae Hyun Sim Chunhee Seo Jihye Nam Sangheon Lee Soyeon Suk Jaeyong Kim Youngjong Kang 《Advanced materials (Deerfield Beach, Fla.)》2018,30(39)
Perovskite nanoparticle composite films with capability of high‐resolution patterning (≥2 µm) and excellent resistance to various aqueous and organic solvents are prepared by in situ photosynthesis of acrylate polymers and formamidinium lead halide (FAPbX3) nanoparticles. Both positive‐ and negative‐tone patterns of FAPbX3 nanoparticles are created by controlling the size exclusive flow of nanoparticles in polymer networks. The position of nanoparticles is spatially controlled in both lateral and vertical directions. The composite films show high photoluminescence quantum yield (up to 44%) and broad color tunability in visible region (λpeak = 465–630 nm). 相似文献