• 대한치과보철학회지
• /
• 제58권1호
• /
• pp.67-76
• /
• 2020

컴퓨터 지원 설계 제조 기술(CAD/CAM)의 발전에 따라, 완전한 디지털 워크플로우를 구현하기 위한 첫번째 단계인 구내스캐너의 중요성이 높아지기 시작했다. CAD/CAM 이중스캔 기술은 임시 수복물의 외형을 복제하여 최종 수복물에 반영하도록 하는 방법이다. 이 증례에서는 비심미적인 전치부, 중증도의 마모, 수직 고경의 감소를 보이는 67세 남성을 치관 연장술과 수직고경 회복을 동반한 완전구강회복을 통해 치료했다. 임시 수복물은 구내스캐너와 CAD/CAM 이중스캔을 이용해 제작되었다. 적응 기간 후, 최종 단일 구조 지르코니아 수복물을 CAD/CAM 이중스캔을 이용해 임시 수복물을 반영해 제작되었다.

• 한국기계가공학회지
• /
• 제14권5호
• /
• pp.120-125
• /
• 2015

This research aims to increase the reliability and reproducibility of the ambient cycling test by properly making corrections to the test procedure. The vessel (106 L) is initially filled with 70 L of water and horizontally placed on a balance. The pressure range inside the vessel varies from 2.5 to 25.9 MPa at the frequency of 6 cycles per minute. After reviewing the results, there was a temperature difference of approximately $10^{\circ}C$ between the air pocket and the water, and the upper part of the liner faced a repeated temperature change of $40^{\circ}C$. It is possible for the aluminum liner of the composite vessel to be damaged by such a sharp change in temperature. Additionally, as a result, no pass having anything to do with the purpose of the test would occur. Therefore, it is suggested that the air pocket be completely removed.

• 대한전자공학회논문지
• /
• 제26권2호
• /
• pp.76-86
• /
• 1989

산업기술의 발달로 조립현장에서는 특수한 기능을 갖는 센서와 투울들을 정착한 지능 로보트들이 현재 많이 이용되고 있다. 이러한 지능 로보트들을 사용하는 자동 제조 시스템들이 보다 발전되고 복잡해짐에 따라 작업장내에 있는 여러 로보트들 뿐만 아니라 주변 장치들을 동시에 제어할 수 있는 보다 발전된 형태의 로보트 언어에 대한 필요성이 점증하고 있다. 본 논문에서는 제조 공정내에 존재하는 여러 로보트들 뿐만 아니라 주변 장치들을 동시에 제어할 수 있는 새로운 형태이 로보트 언어, ARL(assembly robot language)을 제안하고 이를 구현하였다. 본 언어 시스템에서는 기존 로보트 언어들이 갖는 공통적인 기능들과 디버깅 기능 이외에 대부분의 기존 언어들이 하드웨어 종속적인 점을 감안하여 별도의 전담 프로세스와 프로세스간 통신을 위한 공통 메모리를 이용하여 로보트나 주변장치에 종속적인 요소들을 최소화 하도록 하여 확장성이나 환경변화에 따른 적응성이 좋도록 하였다.

• 한국건축시공학회지
• /
• 제4권2호
• /
• pp.129-136
• /
• 2004

High fluidity concrete(HFC) requires high dosage of superplasticizer to acquire sufficient fluidity, and high contents of fine powder and viscosity enhancing admixtures to resist segregation. The use of high amount of admixtures to make HFC at batcher plant in ready mixed concrete company is one of the reasons to raise the manufacturing cost of HFC. For this reason, new type of manufacturing method of HFC are described using both flowing concrete method and segregation reducing superplasticizer(SRS) in order to gain economical profit and offer the convenience for quality control.. As dosage of melamine based superplasticizer increases, it shows that fluidity and bleeding increase, while air contents and ratio of segregation resistance decrease. It also shows that addition of viscosity agent into superplasticizer reduce bleeding and improve segregation resistance of concrete. Dosage of AE agent into superplasticizer containing viscosity agent recovers loss of air contents during flowing procedure. Combination of proper contents of superplasticizer, viscosity agent and AE agent make possible to develope segregation reducing type superplasticizer. Compressive strength of high fluidity concrete applying flowing method with it is higher than that of base concrete. No differences of compressive strength between compacting methods are found. For the estimation of construction cost of high fluidity concreting using segregation reducing type superplasicizer, under same strength levels, although material cost of high fluidity concrete is somewhat higher than that of plain concrete due to segregation reducing type superplasticizer cost, labor cost and equipment cost of high fluidity concrete is cheaper than that of plain concrete. However, based on the strength differences, high fluidity concrete shows lower material cost, labor cost and equipment cost than that of plain concrete due to decreasing in size of member and re-bar caused by high strength development of concrete.

• The Journal of Advanced Prosthodontics
• /
• 제10권5호
• /
• pp.335-339
• /
• 2018

PURPOSE. The purpose of the present study was to compare scanning trueness and precision between an abutment impression and a stone model according to dental computer-aided design/computer-aided manufacturing (CAD/CAM) evaluation standards. MATERIALS AND METHODS. To evaluate trueness, the abutment impression and stone model were scanned to obtain the first 3-dimensional (3-D) stereolithography (STL) file. Next, the abutment impression or stone model was removed from the scanner and re-fixed on the table; scanning was then repeated so that 11 files were obtained for each scan type. To evaluate precision, the abutment impression or stone model was scanned to obtain the first 3-D STL file. Without moving it, scanning was performed 10 more times, so that 11 files were obtained for each scan type. By superimposing the first scanned STL file onto the other STL files one by one, 10 color-difference maps and reports were obtained; i.e., 10 experimental scans per type. The independent t-test was used to compare root mean square (RMS) data between the groups (${\alpha}=.05$). RESULTS. The $RMS{\pm}SD$ values of scanning trueness of the abutment impression and stone model were $22.4{\pm}4.4$ and $17.4{\pm}3.5{\mu}m$, respectively (P<.012). The $RMS{\pm}SD$ values of scanning precision of the abutment impression and stone model were $16.4{\pm}2.9$ and $14.6{\pm}1.6{\mu}m$, respectively (P=.108). CONCLUSION. There was a significant difference in scanning trueness between the abutment impression and stone model, as evaluated according to dental CAD/CAM standards. However, all scans showed high trueness and precision.

• 한국의류학회지
• /
• 제33권1호
• /
• pp.80-91
• /
• 2009

The purpose of this study is to examine how he successfully connected his ideas of fashion design for art with the commerciality without a conflict about for 40 years. It is expected that this study will be a precedent in the aspect of the symmetry between artistry and commercialization in Issey Miyake's works. We will examine Issey Miyake's idea of fashion design and its development for the commercialization since 1970s that he started to give shape to his ideas in the fashion works to exactly commercialize in the market. 1. Re-creation of tradition(a piece of cloth): throughout the 1970s, Miyake continued to experiment with a variety of Eastern design elements. The elements of Japanese or oriental tradition made him to be at the very center of supreme of the world of fashion. He took advantages of his identity, and developed the tradition for mass produce. 2. Design for mass(Pleats Please): Miyake decided to make clothes for the people, not only for the top class of the society. This thought developed the designs for the mass, which were functional, universal for the modem buyer, and accessible to a wide market. He realized his ideal by the medium of pleats, which were made through industrial processes, while he tried variously the aspect of formative of the pleats in the collections. His designs concept is summarized by the industrial product design and anonymous design. 3. Innovation of manufacturing system(A-POC): Miyake in 1999 developed A-POC. A-POC is used modern computers in conjunction with traditional technology. A-POC does not make only a new cloth but also makes a new manufacturing system of clothes.

• 한국기계가공학회지
• /
• 제16권5호
• /
• pp.13-18
• /
• 2017

In this work the augmented safety of Type 4 composite vessel in accordance with uniform-stress design has been demonstrated through a series of burst tests and structural analyses. For this end, three sample vessels were used: (1) designed as guided by the isotensoid dome theory (called iso-dome cylinder); (2) with dome longer compared to uniform-stress design (called prolate cylinder); and (3) with dome wider than uniform-stress design (called oblate cylinder). Structural analyses have been performed using ABAQUS finite element code based on the periodic symmetry to circumferential direction. As a result, the maximum stresses are induced around the bodies of all three cylinders. However, the analyses, with the assumption of possible defect demonstrate that the maximum stresses are induced around the dome knuckles for the prolate and the oblate cylinders. The results of the burst tests for the three cylinders show that the burst initiates from the cylinder body of the iso-dome cylinder and from the dome knuckles of the prolate and the oblate cylinders. Finally, it is recommended that, to comply with DOT CFFC 2007, the dome shape should be designed and fabricated as guided by the isotensoid dome theory.

• 한국산학기술학회논문지
• /
• 제16권2호
• /
• pp.1461-1468
• /
• 2015

대규모 갱도의 보강을 위해 현재 일반적인 광산 지보재(록볼트 및 강지보재)가 대부분 적용되고 있으며, 일부에서는 현장타설 숏크리트로 연약지반 보강을 실시하고 있다. 그러나 광산 갱도 굴착 후 매번 숏크리트를 타설할 수는 없는 국내 광산 여건상 경제성 및 부지확보의 문제로 고정적인 현장 배치플랜트를 확보하지 못하고, 인근 레미콘 제조 공장에서 배합된 숏크리트 재료를 공급받아 시공하고 있다. 그러나 레미콘 제조 공장에서 운반되는 숏크리트는 이동 거리 및 시간에 따라 품질이 저하되고, 광산 시공 현장에 상주하는 전문 품질관리자의 부재로 시공 품질 관리에 어려움이 많은 실정이다. 따라서 본 논문에서는 혼화재료의 종류와 혼입률을 변수로 선정하여 숏크리트의 역학적 특성과 단기 내구성 평가를 위한 실내실험을 실시하였다.

• 한국가스학회지
• /
• 제24권4호
• /
• pp.48-55
• /
• 2020

낙뢰 보호 시스템의 설치는 증가하고 있으나, 피해량은 여전히 줄지 않고 있다. 이 연구에서는 피뢰시스템의 안전관리 방안의 제도적 개선을 위한 목적으로 피뢰시스템에 관한 기준을 파악하고 현장조사와 설문을 통해 피뢰 시스템의 설치, 운영, 유지보수 등 실증분석을 실시했다. 국가표준 KS C IEC 62305에서 정하고 있는 기준 및 규정을 만족하지 못하는 것으로 파악되며, 이러한 문제를 해결할 수 있도록 국가적인 차원에서 피뢰시스템의 안전인증제품 관리, 안전기준의 설계·제작·시공 등 관리 기준이 이행 될 수 있도록 관련 규정 재정립을 통한 안전관리 방안을 제시한다.

• 한국식생활문화학회지
• /
• 제3권2호
• /
• pp.211-217
• /
• 1988

The Main objective of this study is to find consumer attitude toward the Sanitary Regulation of Foods. In view of consumerism, this result will be used in re-regulating the law. Among the Sanitary Regulation of Foods, this study focuses on the Standard of prepackaged Food Labelling, because it is related both with the advertising from the food manufacturer's point of view and with the perception about the food itself from the consumer's point of view. After reviewing the previous studies and related provisions about the Standard of Prepackaged food Labelling, and compare other sanitary regulation of foods in developed countries (U.S.A. and Japan), basic research framework was derived. The research framework focuses on the user perception about the validity of provisions about the Standard of Prepackaged Food Labelling, and on the existance of exaggeration in food advertising using prepackaged foods. Data were collected through questionaires from the sample covering 374 food customers. The data were analyzed by frequency test and the important findings of this study are as follows. Most food consumers consider such provisions as date of manufacturing, circulation time limit, cautions for food handling, price, and manufacturer as important factors in buying food products. Among these factors, the date of manufacturing and circulation time limit are most critical factors, and must be labelled correctly on the prepackaged food cover. But other provisions which do not affect on consumer's buying decision (e.g. business admission number, self standard number) need not be labelled. From this study, we can conclude that the provisions about the standard of prepackaged Food Labelling currently used must be devided into two parts. One is 'mandatory provisions' which must be obeyed by all food manufacturets, and the other is 'autonomous provisions' which need not be obeyed by all food manufacturers. And mandatory provisions need to be regylated more strongly than now.