• Title/Summary/Keyword: 제조방식

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Accuracy of CAD-CAM RPD framework according to manufacturing method: A literature review (국소의치 구조물(framework)의 CAD-CAM 제조방식에 따른 정확도: 문헌고찰)

  • Yi, Yuseung
    • The Journal of Korean Academy of Prosthodontics
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    • v.59 no.3
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    • pp.370-378
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    • 2021
  • Purpose. The purpose of this study was to evaluate the currently published literatures investigating the accuracy of computer-aided design and computer-aided manufacturing removable partial denture (CAD-CAM RPD) framework with different manufacturing techniques and methods. Materials and methods. A comprehensive search for literatures was conducted in PubMed database using specific keywords with the patient, intervention, comparison, and outcome (PICO) question, "Is there a difference in accuracy of RPD frameworks manufactured using digital workflow according to the manufacturing process and methods?" Results. A total of 7 articles were selected. Two studies compared intraoral scanning and laboratory scanning for RPD frameworks and had heterogenous results. In the studies using different manufacturing process, RPD frameworks had clinically acceptable accuracy in both subtractive and additive manufacturing. Polyetheretherketone (PEEK)-milled RPD frameworks showed higher fit accuracy than traditionally casted or 3D printed RPDs. Direct milling method showed a higher accuracy than indirect milling method. However, in rapid prototyping, indirect method showed higher accuracy than direct method. Conclusion. The RPD frameworks fabricated using CAD-CAM technology showed a clinically acceptable level of accuracy regardless of manufacturing process or techniques. Consistent results have not been reported regarding the digital impression methods, which were intra oral scanning or laboratory scanning, and further studies are needed.

Object-Oriented Modeling and Simulation of Automated Manufacturing Systems : the K-SIM Case (자동화제조시스템의 객체지향적 모델링기법과 시뮬레이션구현방법: K-SIM의 사례)

  • Lee, Tae-Eog;Lee, Jin-Kyu;Lim, Hyeong-Kyu;Lee, Jin-Hwan
    • IE interfaces
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    • v.8 no.3
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    • pp.47-60
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    • 1995
  • 물류시스템간의 상호작용이 복잡한 자동화제조시스템을 시뮬레이션하기 위해서는 전통적인 사건중심의 모델링이나 고객중심의 프로세스묘사방식 모델링보다 서버중심의 프로세스상호작용방식 모델링이 유리하다. 이러한 모델링 방식은 기존의 동적시스템 모델링 이론과도 일치하며 최근의 소프트웨어엔지니어링기법인 객체지향적 모델링기법과도 상통한다. 본 연구에서는 객체지향적 모델링 기법을 바탕으로 서버중심의 프로세스상호작용방식에 기초한 시뮬레이션 모델링 방법을 제안한다. 이러한 방법을 자동화제조시스템의 시뮬레이션모델링에 작용한 예를 소개하고, 순차적 처리언어인 C++ 사용하여 프로세스상호작용방식의 시뮬레이션 실행기를 구현하는 방법을 설명한다.

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Error Time Message Broadcast Method to Prevent Deadlock in Dynamic Reconfiguration Environment (동적 재구성 환경에서 교착상태를 예방하기 위한 오차 시간 메시지 브로드캐스트 기법 연구)

  • Shin, Hyun-Jun;Kim, Sung-Jin;Oh, Chang-Heon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.11
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    • pp.2131-2136
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    • 2016
  • Before Industry 4.0, a purpose of manufacturing processes is simply overcoming the weakness of product line. However, Industry 4.0 should determine its method of work of facilities' own accord. Manufacturing processes such as FMS, AMS, MAS have been developed in these procedures, but there are possibilities of deadlock that can be happened for the reason of machine, agent or resource sharing. There were many studies to solve this problem. However, studies about prevention of deadlock happened in the situation that manufacturing processes are reconfigured dinamically because of human's intervention are incomplete. This paper proposes the model of the situation reconfigured dinamically and the method to prevent the deadlock in this situation. The proposed method adjusts production and manufacturing time by broadcasting time error messages to machines around when the manufacturing time of machine intervened by human is changed. Through this, it is anticipated to prevent the deadlock if conditions of the product line are changed.

ICT DIY 표준화 및 정책 동향

  • Lee, Yun-Gwan;Jeon, Jong-Hong;Lee, Seung-Yun;Kim, Hyeong-Jun
    • Information and Communications Magazine
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    • v.31 no.7
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    • pp.47-51
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    • 2014
  • 최근 제조업 방식의 진화에 따라 다품종 대량 생산 방식의 디지털 제조(Digital Fabrication)가 새롭게 등장하였다. 디지털 제조의 등장 배경은 오픈소스 하드웨어의 등장, 온라인 커뮤니티의 활성화, 3D 프린터와 같은 디지털 제조 기계의 등장에 있으며, 선진국들을 중심으로 소비자의 구매력 향상과 자아실현 욕구의 상승 또한 주요한 배경이라 할 수 있다. 이에 본 논문에서는 디지털 제조의 핵심으로 떠오르고 있는 ICT DIY의 개념 및 주요 현황에 대한 국내외 기술 동향 등을 살피고 나아갈 ICT DIY 표준화 및 정책방향에 대해 고찰하고자 한다.

Physicochemical Characteristics of the Mash Quality of Cheongju Prepared Using Different Nuruks (누룩종류를 달리한 청주 술덧의 이화학적 특성)

  • Jeong, Myeong Eun;Kang, Soon Ah;Cheong, Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.8
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    • pp.5150-5158
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    • 2014
  • This study examined the physicochemical characteristics of mashing prepared using different Nuruks (traditional Nuruk, Nuruk added Aspergillus oryzae, Nuruk added Aspergillus kawachii, and Nuruk added Aspergillus oryzae and Aspergillus kawachii), and to obtain the basic data for Korean Cheongju production. The four different mashes were compared for their brewing characteristics and indicated a normal fermentation pattern. The Nuruk made from A. oryzae or A. kawachii showed higher fermentation ability than the other samples tested. In addition, the analyzed results of fermented mashing showed that the Nuruk made from A. oryzae or A. kawachii had a significantly higher aroma profile, such as higher alcohol and ester than the other samples tested, whereas the Nuruk made from a mixture of A. oryzae and A. kawachii had a much higher organic acid content. In conclusion, the Nuruk prepared using A. oryzae or A. kawachii had a positive effect on the complete fermentation and enhanced aroma compounds for Korean Cheongju production.

Physicochemical and Sensory Characteristics of Beef-bone Broths Prepared under Atmospheric Pressure and Overpressure (상압과 가압조건에서 제조한 소뼈 용출액의 이화학 및 관능 특성)

  • Moon, Sang Ha;Kim, Jaecheol;Hwang, Keum Taek;Cha, Yong Bum
    • Korean Journal of Food Science and Technology
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    • v.47 no.6
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    • pp.725-732
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    • 2015
  • This study was conducted to compare the physicochemical and sensory characteristics of beef-bone broths prepared under atmospheric pressure (BBAP) and overpressure (BBOP). Beef-bone was boiled in water (bone/water=1:2, w/w) for 1, 2, 4, 6, and 12 h under atmospheric pressure and overpressure ($121^{\circ}C$, 1.25 atm). The BBOP broth samples were found to contain significantly higher amounts of solid, crude protein, crude ash, collagen, and chondroitin sulfate than the BBAP broth samples for a given boiling time (p<0.05). In addition, the Ca and Mg contents in the BBAP samples were higher than those in the BBOP samples, whereas the P, Na, and K contents were higher in BBOP than BBAP. The L value of BBAP was also significantly higher than that of BBOP (p<0.05). Further, as the boiling time increased, turbidity increased in the BBAP samples. In the quantitative descriptive analysis, the BBOP samples exhibited stronger brownness, transparency, meaty off-odor, meaty off-flavor, and sulfuric odor than the BBAP samples.

Preparation and Characteristics of Soda Lime for Carbon Dioxide Absorption (이산화탄소 흡수를 위한 소다라임 제조 및 특성)

  • Young-Jin Kim;Seok-Je Kwon;Jun-Hyung Seo;Yang-Soo Kim;Kye-Hong Cho;Jin-Sang Cho
    • Resources Recycling
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    • v.32 no.2
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    • pp.52-58
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    • 2023
  • In this study, soda lime was prepared from slaked lime to expand the scope of limestone use. To evaluate carbon dioxide absorption, an extruder-type and disc-type pelletizers were used to make the soda lime using bentonite as an additive. Regardless of the pelletizing process, the peak of CaCO3 was confirmed in soda lime due to its reaction with carbon dioxide. Furthermore, it was confirmed that both calcite and aragonite were present together. The soda lime prepared using the disc-type pelletizer showed a larger specific surface area than that prepared using the extruder-type pelletizer did, and the specific surface area improved on adding bentonite. The carbon dioxide absorption rate increased under the sample condition with an enhanced specific surface area.

Implementation of Traceability in Production Process Using RFID (RFID를 활용한 생산공정 Traceability 구축 사례연구)

  • Ryou, Ok-Hyun;Lee, Jae-Kwang;Noh, Seong-Ho
    • 한국IT서비스학회:학술대회논문집
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    • 2006.11a
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    • pp.517-522
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    • 2006
  • 본 논문은 RFID를 활용하여 자동차 제조 분야의 Traceability 구축 사례를 연구한 것이다. 전통적인 자동차 제조 환경 분석을 통하여 자동차 제조 분야의 Traceability 구축의 필요성과 RFID 기술의 적용 가능성을 분석하였다. RFID 기술을 활용한 통한 Traceability 구축을 위한 제조 및 공급망 관련 프로세스의 변경 내용 및 효과에 대하여 분석하였다. 실제 사례 기업은 Traceability 구축을 통하여 기존의 일 단위 결산 재고방식에서 실시간 재고방식으로 전환할 수 있게 되었으며, 상주원의 재고량 판단으로 부품 공급 시기와 양을 결정했던 방식에서 실시간 정보전달로 입고와 불출량 결정할 수 있게 되어 사내부품고의 최소 최적화가 가능하게 되었으며, 납입지시 신뢰도 향상 및 정보이용범위 확대(트래킹, 품질정보 등)를 통한 오보충 및 재고 진부화 방지 효과를 얻고 있다. 본 논문은 사례 기업의 Traceability 구축 과정에서 프로세스 변경, 관리 내용의 변경, RFID 기술의 적용 부분, 협력사와의 협업 등에 관련된 주요 이슈에 대하여 분석하여 향후 관련 분야의 Traceability 구축시 고려 요소 및 시사점을 제시하였다.

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The Effect of Manufacturing Method Preferences for Different Product Types on Purchase Intent and Product Quality Perception (제품유형에 따른 제조방식 선호가 구매의도와 품질지각에 미치는 효과)

  • Lee, Guk-Hee;Park, Seong-Yeon
    • Science of Emotion and Sensibility
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    • v.19 no.4
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    • pp.21-32
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    • 2016
  • Studies have observed various phenomena regarding the effect of the interaction between type, price, and brand image of a product on consumers' purchase intent and product quality perception. Yet, few have studied the effect of the interaction between product type and manufacturing method on these factors. However, the advent of three-dimensional (3D) printers added a new manufacturing method, 3D printing, to the traditional methods of handicraft and automated machine-based production, and research is necessary since this new framework might affect consumers' purchase intent and product quality perception. Therefore, this study aimed to verify the effects of the interaction between product type and manufacturing method on purchase intent and product quality perception. To achieve this, in our experiment 1, we selected product types with different characteristics (drone vs. violin vs. cup), and measured whether consumers preferred different manufacturing methods for each product type. The results showed that consumers preferred the 3D printing method for technologically advanced products such as drones, the handmade method for violins, and the automated machine-based manufacturing method, which allows mass production, for cups. Experiment 2 attempted to verify the effects of the differences in manufacturing method preferences for each product type on consumers' purchase intent and product quality perception. Our findings are as follows: for drones, the purchase intent was highest when 3D printing was used; for violins, the purchase intent was highest when the violins were handmade; for cups, the purchase intent was highest when machine-based manufacturing was used. Moreover, whereas the product quality perception for drones did not differ across different manufacturing methods, consumers perceived that handmade violins had the highest quality and that cups manufactured with 3D printing had the lowest quality (the purchase intent for cups was also lowest when 3D printing was used). This study is anticipated to provide a wide range of implications in various areas, including consumer psychology, marketing, and advertising.

디지털생산 - 협업을 위한 핵심 전략

  • 노상도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.36-36
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    • 2004
  • 현재의 제조업들은 극도로 심화된 기업 간의 경쟁과 고객 요구사항의 급변으로 인해 신속한 제품 개발 및 효율적 제조를 요구받고 있다. 생산시스템은 대량생산방식(mass Production)에서 적시/적량 생산방식(lean production)으로 발전해왔고, 최소의 리드타임(lead time)을 갖는 민첩한 생산시스템으로의 발전이 요구되고 있으며, 근래에 새롭게 대두되고 있는 생산 패러다임인 e-Manufacturing에서는 확장된 기업체계 하에서 협업적 제품 개발과 신속 제조(collaborative product development and rapid production)의 달성을 지향하고 있다.(중략)

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