• Title/Summary/Keyword: hyper method

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Developing evaluation criteria for quality management systems adoption by using delphi technique (델파이 기법을 활용한 품질경영시스템 조직 진단 항목개발에 관한 연구)

  • Choi, Jaewoong;Jun, Byoungho;Choi, Jaeyoung
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.12 no.2
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    • pp.87-102
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    • 2016
  • The customer requirements are constantly changing in the hyper-competition and competition is becoming increasingly intensified. In order to ensure the competitive advantage in the industry should focus on the management activities to enhance customer satisfaction. High quality means pleasing customers, not just protecting them from annoyances. It is due to continuous and requires the establishment of a quality management system that meets the characteristics and systematization need to manage a stable quality and productivity, which should be done in a company-wide quality management activities. The purpose of this study is to identify a suitable organizational diagnostic model for considering to adopt ISO 9001 quality management systems. We used the three-round delphi techniques on a panel of 30 experts. A total of 26 assessment indicators were developed through this panel. First, it is important to evaluate the strategy about quality. Second, it is important to evaluate the systems about periodically communicating quality agenda. Third, it is important to evaluate the responsibility of overall business process. In conclusion, this study empirically shows how firms can develop an organizational diagnostic model to increase their quality management systems.

Experimental and Numerical Analyses of Flexible Forming Process for Micro Channel Arrays of Fuel Cell Bipolar Plates (연료전지 분리판의 마이크로 채널 제작을 위한 가변성형공정의 실험적 및 수치적 연구)

  • Kim, H.S.;Shim, J.M.
    • Transactions of Materials Processing
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    • v.21 no.8
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    • pp.499-505
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    • 2012
  • The fuel cell is a very promising power generation system combining the benefits of extremely low emissions, high efficiency, ease of maintenance and durability. In order to promote the commercialization of fuel cells, a flexible forming process, in which a hyper-elastic rubber is adopted as a medium to transmit forming pressure, is suggested as an efficient and cost effective manufacturing method for fuel cell bipolar plates. In this study, the ability of this flexible forming process to produce the micro channel arrays on metallic bipolar plates was first demonstrated experimentally. Then, a finite element (FE) model was built and validated through comparisons between simulated and experimental results. The effects of key process parameters on the forming performance such as applied load and punch velocity were investigated. As a result, appropriate process parameter values allowing high dimensional accuracy without failure were suggested.

A Study on the Prediction of Optimized Injection Molding Condition using Artificial Neural Network (ANN) (인공신경망을 활용한 최적 사출성형조건 예측에 관한 연구)

  • Yang, D.C.;Lee, J.H.;Yoon, K.H.;Kim, J.S.
    • Transactions of Materials Processing
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    • v.29 no.4
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    • pp.218-228
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    • 2020
  • The prediction of final mass and optimized process conditions of injection molded products using Artificial Neural Network (ANN) were demonstrated. The ANN was modeled with 10 input parameters and one output parameter (mass). The input parameters, i.e.; melt temperature, mold temperature, injection speed, packing pressure, packing time, cooling time, back pressure, plastification speed, V/P switchover, and suck back were selected. To generate training data for the ANN model, 77 experiments based on the combination of orthogonal sampling and random sampling were performed. The collected training data were normalized to eliminate scale differences between factors to improve the prediction performance of the ANN model. Grid search and random search method were used to find the optimized hyper-parameter of the ANN model. After the training of ANN model, optimized process conditions that satisfied the target mass of 41.14 g were predicted. The predicted process conditions were verified through actual injection molding experiments. Through the verification, it was found that the average deviation in the optimized conditions was 0.15±0.07 g. This value confirms that our proposed procedure can successfully predict the optimized process conditions for the target mass of injection molded products.

A Feasibility Study on the Brazing of Zircaloy-4 with Zr-Be Binary Amorphous Filler Metals (비정질 이원계 합금 Zr-Be 용가재를 이용한 지르칼로이-4의 브레이징 타당성 검토)

  • 고진현;박춘호;김수성
    • Journal of Welding and Joining
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    • v.17 no.4
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    • pp.26-31
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    • 1999
  • An attempt was made in this study to investigate the brazing characteristics of Zr-Be binary amorphous alloys for the development of a new brazing filler metal for joining Zircaloy-4 nuclear fuel cladding tubes. This study was also aimed at the feasibility study of rapidly solidified amorphous alloys to substitute the conventional physical vapor-deposited(PVD) metallic beryllium. The $Zr_{1-x}Be_{x}$($0.3\leq$x$\leq0.5$) binary amorphous alloys were produced in the ribbon form by the melt-spinning method. It was confirmed by x-ray diffraction that the ribbons were amorphous. The amorphous. the amorphous alloys were used to join bearing pads on Zircaloy-4 nuclear fuel cladding tubes. Using Zr-Be amorphous alloys as filler metals, it was found that the reduction in the tube wall thickness caused by erosion was prevented. Especially, in the case of using $Zr_{0.65}Be_{0.35}$ and $Zr_{0.7}Be_{0.3}$ amorphousalloys, the smooth and spherical primary $\alpha$-Zr particles appeared in the brazed layer, which was the most desirable microstructure from the corrosion-resistance standpoint.

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Theoretical Study of Solvent Effect on Yield of Oxidative Addition Reaction (산화첨가반응의 수득률에 미치는 용매효과에 관한 이론적 연구)

  • Lee, Chul-Jae;Kim, Byung-So
    • Applied Chemistry for Engineering
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    • v.21 no.5
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    • pp.586-589
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    • 2010
  • In present work, oxidative addition reaction of 1,3-cycleohexandion (1,3-CHD) with ethyl vinyl ether (EVE) was attempted utilizing $Ag_2CO_3$/celite (SC) reagent. In order to optimize reaction conditions, we surveyed several solvents for the production of dihydrofuran with the (SC) system. The yield of the acetonitrile (AN), dimethyl sulfoxide (DMSO), benzene (BZ), and heptane (HT) are given 78, 40, 15, and 10%, respectively. Therefore, we studied the solvent effects on yields by using PM3 and ZINDO/1 parameter of semi-empirical method of HyperChem7.0 molecular modeling program.

Nasometric and Acoustic Analysis in Experimentally Induced Velopharyngeal Insufficiency in Human (사람에서 유발시킨 구개인두부전증의 비음도와 음향학적 분석)

  • 윤자복;성명훈;정원호;김광현
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.8 no.2
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    • pp.210-216
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    • 1997
  • Many tools have been used to evaluate the voice abnormalities of velopharyngeal insufficiency(VPI). The aim of study was to obtain the objective evaluation method of VPI by comparing the acoustic and nasalance data of experimentally induced VPI group and those of normal control group. Ten healthy young men were included in this study Mild and severe VPI were experimentally induced by retracting velopharyngeal movement. Using the nasometer, we obtained the nasalance score of the sustained oral vowels and those of three types of nasometer passages and the slope scores of nasogram of nasal words. And we analysed the change of formant frequencies for the sustained oral vowels and the changes of various parameters of hyper-tnasality by the computerized speech analysis system. The nasalance score of sustained /a/ was increased significantly in VPI conditions. There was no changes in the slope score of nasogram. On the acoustic speech analysis, the second formant frequencies of vowel /e/ and /i/ were decreased significantly in VPI conditions. This results suggested that the measurement of nasalance score and formant frequency might be useful in the evaluation of VPI.

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A situation-Flexible and Action-Oriented Cyber Response Mechanism against Intelligent Cyber Attack (지능형 사이버공격 대비 상황 탄력적 / 실행 중심의 사이버 대응 메커니즘)

  • Kim, Namuk;Eom, Jungho
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.16 no.3
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    • pp.37-47
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    • 2020
  • The In the 4th industrial revolution, cyber space will evolve into hyper-connectivity, super-convergence, and super-intelligence due to the development of advanced information and communication technologies, which will connect the nation's core infrastructure into a single network. As applying the 4th industrial revolution technology to the cyber attack technique, it is evolving in an intelligent and sophisticate method. In order to response intelligent cyber attacks, it is difficult to guarantee self-defense in cyberspace by policy-oriented, preplanned-centric and hierarchical cyber response strategies. Therefore, this research aims to propose a situation-flexible & action-oriented cyber response mechanism that can respond flexibly by selecting the most optimal smart security solution according to changes in the cyber attack steps. The proposed cyber response mechanism operates the smart security solutions according to the action-oriented detailed strategies. In addition, artificial intelligence-based decision-making systems are used to select the smart security technology with the best responsiveness.

Non-Linear Optical Properties of Polyacetylene Using Ab Initio Time-Dependent Hartree-Fock Theory (폴리 아세틸렌의 비선형 광학성질에 대한 양자 역학적 고찰)

  • Kim, Seung Joon
    • Journal of the Korean Chemical Society
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    • v.40 no.5
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    • pp.317-326
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    • 1996
  • The frequency dependent longitudinal polarizabilities ${\alpha}zz(\omega)$ and the second hyper-polarizabilities ${\gamma}zzzz(\omega)$ of the linear polyenes, $C_4H_6\;to\;C_{30}H_{32}$, have been evaluated using the ab initio time-dependent coupled perturbed Hartree-Fock (TDCPHF) theory with the 6-31G basis set. The ratios of the dynamic properties to the static values have been examined to illustrate the relative dispersion effect and extrapolated to the infinite polymer limit. Also the effect of interchain interaction for linear and nonlinear optical properties has been investigated for $C_4H_6$ and the theoretical discussion has been described to overcome the limitation of ab initio TDHF method in the resonance region.

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A Resistance Property Against High Velocity Impact on Oxynitride Glasses (질화유리의 고속충돌 저항물성)

  • Kim, Chang-Wook;Lee, Hyung-Bock
    • Journal of the Korean Ceramic Society
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    • v.43 no.10 s.293
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    • pp.646-652
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    • 2006
  • Several oxynitride glasses were fabricated by means of adding $Si_3N_4$ powders as nitrogen source to Ca-Al-Si-O-N (CAS) and Mg-Al-Si-O-N (MAS) glass powders, and heat-treated in graphite crucible at 1600$^{\circ}C$ for 1 h. The physical and mechanical properties as well as impact resistance were generally increased and compared with each other. The impact resistance properties of those manufactured glasses were evaluated by DOP (depth of penetration) method which is a way to analyze armor materials. There were two means to be used herein; the copper jet impacted at hyper velocity by exploding K2l5 warhead and tungsten heavy alloy (WHA) impact bar at high velocity by firing in 30 mm solid propellent gun. The impact resistance properties against copper jet were increased and then decreased with increasing nitrogen content, while those against WHA bar were not changed apparently with nitrogen content.

A Study of Simulacre Expression in Fashion Illustrations, Using Lenticular Technique (렌티큘러 기법을 활용한 패션일러스트레이션의 시뮬라크르적 표현 연구)

  • Lee, Jee-Hyun
    • Journal of the Korean Society of Costume
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    • v.59 no.8
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    • pp.152-165
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    • 2009
  • The purpose of this study was to expand the expression of Fashion Illustration using Lenticular imaging process. In the 2-dimensional pictures, Lenticular imaging process can be effective to make multiple, virtual and variable images, which are assumed the main characteristics of modern Fashion Illustration. For this study, the main characteristics of digital based fashion trend and Fashion Illustration were analyzed. The main characteristics of digital based fashion were 'Interaction, Variableness, Virtuality, Multiples and Hyper-text' which were related with Simulacre thinking. The main characteristics of expression in Fashion Illustration were 'Virtuality and Multiples'. The image of 'Variableness' was an important factor in digital based fashion, but it was restricted within Fashion Illustration because of the 2-dimensional picture. Therefore, the Lenticular imaging process was proposed as an effective method to expand 2-dimensional limit, giving an effect of 'Variableness' in Fashion Illustration. Based on this study, 5 illustration works were proposed. The Lenticular imaging process was applied in making the images of 'Virtuality, Multiples and Variableness' in 5 works. The result of this study can be a basic material to understand the characteristics of modern Fashion Illustration as a meaningful sub-culture, and diverse expressions corresponding with the phases of the times.