• Title, Summary, Keyword: Core Quality

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Improvement of surface quality of Tungsten-carbide core for glass micro molding (미세 유리 광부품 성형용 초경합금 코어의 표면거칠기 향상에 관한 연구)

  • Lee J.;Kim W.;Min B.;Kang S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.36-39
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    • 2004
  • Glass molding is an advantageous method to manufacture glass micro optical components. However, it is difficult to make Tungsten Carbide core for glass microlens array. We have developed novel method to fabricate Tungsten Carbide core for micro glass components using pressure forming. Silicon masters were fabricated by micro machining. Tungsten Carbide core was fabricated by pressure forming and sintering. And we made high quality surface of Tungsten Carbide core by using the magnetic-field-assisted polishing process.

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The Direction Presentation for Quality Improvement of Weapon System based on R&D Characteristics in Defense Field (국방분야의 연구개발 특성분석을 통한 무기체계 품질향상 방향 제시)

  • Park, Sangeun;Hong, Jaeyoung
    • Journal of Korean Institute of Industrial Engineers
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    • v.43 no.2
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    • pp.120-126
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    • 2017
  • This paper has proposed the development direction and R&D analysis approach that the diversity of defense R&D process and product should be mainly under consideration. It has shown that there is a fair possibility of the various quality assess to meet the R&D requirements in defense-based. Thus, the analysis on multiple quality elements is carried out with defense R&D characteristics. Especially, a quality management master planning based on the quality model of establishing defense R&D policy has proposed, identifying relevant quality characteristics on the R&D of weapon system and the R&D of core technology. That is, this paper is not only interested in determining an appropriate model for improving the quality of a R&D weapon system but also argued efforts in order to reap the best possible outcome and process on both the R&D of weapon system and quality of the R&D of core technology including present R&D activities.

Quality Evaluations of Induction Motor Rotors during Die Casting Process (유도전동기 회전자 금형주조 시 품질평가)

  • Park, Sang-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.10
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    • pp.115-120
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    • 2018
  • This study examined the cast quality of small-sized induction motor rotors during the die casting process. Numerical analyses with 3-dimensional half models were performed to investigate the filling patterns of aluminum molten metals into a mold after high-speed injections. The following were obtained from numerical analyses and experimental results. First, molten metals started to fill the lower end ring, then moved horizontally to fill the core slot and upper end ring, and finally stopped to fill the rotor core slot. Second, circulation of molten metals occurred at the lower end ring, resulting considerable porosity at the section of lower end ring from the experimental results. Third, further work for obtaining sound quality of rotor core cast is required to develop a new shape of the rotor core cast or improve the die casting conditions.

Core${\cdot}$Quality${\cdot}$Basic Service Factors of Family Restaurants and Differentiation Strategy for Customer Service Management (패밀리 레스토랑의 핵심${\cdot}$고품질${\cdot}$기본서비스 요인과 요인 별 고객관리 차별화 전략에 관한 연구)

  • Park, Jung-Young
    • Journal of the Korean Society of Food Culture
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    • v.23 no.2
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    • pp.184-193
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    • 2008
  • The purpose of this study was to determine the detailed customer satisfaction and dissatisfaction factors of family restaurants in Korea, and to then classify the factors into 3 groups, inlcuding core service, quality service, and basic service. ‘Core service’ represents the critical factors that generate both satisfaction and dissatisfaction; ‘quality service’ generates only satisfaction; and ‘basic service’ generates only dissatisfaction. This categorization is based on Herzberg’s motivation-hygiene theory (1976) as well as Cadotte & Turgeon (1988). Based on the characteristics of the three groups, differentiation strategies in managing customer service were suggested to the family restaurant managers. A qualitative research method, termed the critical incident technique (CIT), was used in the study. This method helps researchers find new factors or attributes by grouping key issues from the anecdotes (critical incidents) and then categorizing common factors from the key issues. This research categorized key satisfiers and dissatisfiers into 33 factors, which were from 402 critical incidents described by 261 respondents. Eleven factors (response to service failures, food taste and quality, attention paid to customers, coupon/mileage point/discount card, customer’s ordinary requests, waiting, food diversity, food price, facility sanitation, checking out, customer’s special requests) were classified into core service, which required maximum management not regarding the level of customer satisfaction. Six factors (employee attitude, event, education and explanation, complementary food, customer’s mistakes, attention paid to children) were classified into quality service, which required differentiation strategy management. Finally, nine factors (speed of food service, employee’s mistakes, food sanitation, atmosphere and interior, seating, forcing orders, parking, other customers, reservations) were classified into basic service, which required minimum management at the level of the industry standards.

Change of Stiffness and Impact-Resistance of Flush Door Depending on Core Composition (플러쉬문의 심재구성에 따른 강성도 및 내충격성의 변화)

  • 장상식
    • Journal of the Korea Furniture Society
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    • v.12 no.1
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    • pp.39-45
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    • 2001
  • This study was carried out to evaluate the feasibility of using HDF as surface panels as well as core materials for flush door manufacturing. Several core compositions were developed and applied to manufacture door specimens. Core materials were tested under bending load, door manufacturing process was analysed to find better way of using HDF for door manufacturing, and door specimens were tested under bending, twisting and impact loads. From this study, it was concluded that HDF can be used to manufacture quality flush doors. And it was desirable to use light color HDF as surface panels because dark color HDF caused a problem in manufacturing process by shadow shown through finishing veneer. HDF doors were light, and showed good quality and higher resistance against bending twisting and impact loads.

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Research on Using Six Sigma Tool to Reduce the Core Process Time

  • Chung, Yi-Chan;Yen, Tieh-Min;Hsu, Yau-Wen;Tsai, Chih-Hung;Chen, Ching-Piao
    • International Journal of Quality Innovation
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    • v.9 no.1
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    • pp.94-102
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    • 2008
  • When facing the global severe competition, the enterprises all try their best to upgrade the quality, reduce the costs to reach the goal of customer satisfaction. Motorola was the earliest firm creating the term Six Sigma (6 ${\sigma}$); GE was the enterprise successfully fulfilling Six Sigma. The success of these two firms revealed the prominent effects and became the world-class model enterprises. The main purpose of promoting Six Sigma activity was to reduce the possible defects in the business process to the least through designing and monitoring business process in order to reach the goals such as the best quality and efficiency, the lowest costs, the shortest circular process time, maximum profits and customer satisfaction. This research used the Six Sigma technique to improve the business process of ceramics manufacturing plant and find out the major factors of slower core task time by the analytical process of Process Mapping, Pareto Chart, Simu18 simulation software and figures and proposed the improvement measures. Through the confirmation of the case companies, it successfully reduced the core process time and the organizational costs and increased the capacity.

A study on Technology Push-based Future Weapon System and Core Technology Derivation Methodology (빅데이터분석기반의 기술주도형 미래 국방무기체계 및 핵심기술 도출 방법연구)

  • Kang, Hyunkyu;Park, Yongjun;Park, Jaehun
    • Journal of the Korean Society for Quality Management
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    • v.46 no.2
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    • pp.225-242
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    • 2018
  • Purpose: Recent trends have shown that the usage of big data analysis is becoming the core of identifying promising future technologies and emerging technologies. Accordingly, applying these trends by analyzing defense related data in such sources as journals, articles, and news will provide crucial clues in predicting and identifying core future technologies that can be used to develop creative and unprecedented future weapon systems that could change the warfare. Methods: To identify technology fields that are closely related to the 4th industrial revolution and recent technology development trends, environmental analysis, text mining, and military applicability survey have been included in the process. After the identification of core technologies that are militarily applicable, future weapon systems based on these technologies as well as their operation concepts are suggested. Results: Through the study, 73 important trends, from which 11 mega trends are derived, are identified. These mega trends can be expressed by 13 promising technology fields. From these technology fields, 248 promising future technologies are identified. Afterwards, further assessment is performed, which leads to the selection of 63 core technologies from the pool. These are named as "future defense technologies" which then become the bases for 40 future weapons systems that the military can use. Conclusion: Predicting future technologies using text mining analysis have been attempted by various organizations across the globe, especially in the fields related to the 4th industrial revolution. However, the application of it in the field of defense industry is unprecedented. Therefore, this study is meaningful in that it not only enables the military personnel to see promising future technologies that can be utilized for future weapon system development, but helps one to predict the future defense technologies using the method introduced in the paper.

A Comparison of Quality Awards Program in the Major G-20 for Developing a Korean National Quality Award Model (한국형 모델 개발을 위한 국가품질상 국제 비교 연구)

  • Kim, Tai-Kyoo;Kim, Youn-Sung
    • Journal of the Korean Society for Quality Management
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    • v.39 no.2
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    • pp.337-348
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    • 2011
  • To implement total quality management(TQM), firms and institutions have strategically used quality awards models. In this paper we analyzed the national quality awards of G-20 members such as United States, Europe, Japan, Canada, Australia and Korea. There are three main points to analysis; First, "which type of model is good for Korea?", even though Korea already has adopted MBNQA model. Second, "Are the core values really different from each models?". And third, "Is there any difference in the criteria structure and value points system?" This study aims to design a National Quality Award which is good for the Korean companies and organizations. After analyzing the current quality awards models, we propose some suggestion about core value setting Korean-specific criteria development and value points system change.

MB상에 내포된 지속적 개선, 혁신과 학습 개념

  • Jeong, Gyu-Seok;Gang, Yeong-Tae
    • Proceedings of the Korean Society for Quality Management Conference
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    • pp.182-187
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    • 2006
  • The learning, which is an extended concept from the concept of continuos improvement and replace it, has become a very important core concept in Malcom Baldridge National Quality Award these days. The most potent core value among 11 core values is 'organizational and personal learning' Embedded learning in the organization is also a critical part to get a high score in approach scoring criteria for 6 categories except results category. But the concept of learning is often overlooked for the people who have interests in MB award or TQM. This paper review and analyze the concept of learning which has appeared In MB criteria since it's first appearance.

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Influence affected on the curvature radius of jar by circuit of cooling temperature and temperature control (냉온회로 및 제어가 JAR곡율반경에 미치는 영향)

  • Shin, Nam-Ho;Choi, Seok-Jong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.6
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    • pp.1313-1318
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    • 2007
  • When the mold is cooled suddenly to reduce the time for forming work and improve the quality of jar50ml which is different highly at rib thickness by a series of various curvature radii, the poor quality of void, flow and deformation happens. The structure of spiral cooling circuit at cavity and core can control the temperature of inner and outer side sufficiently. And the system can control cooling and heating automatically. These things are applied to Jar mold. and so, the best quality and the effect of productivity improvement can be obtained.

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