• 한국기계가공학회지
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• 제18권3호
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• pp.33-40
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• 2019

FDM 3D printers have become widespread, and investment in the 3D printer industry is increasing. Therefore, many 3D printers are released and the functions of products are emphasized. However, to lower unit prices, open-type 3D printers are sold in kit form, and their performance is very low. If the 3D printer has many heat sources and is sealed, there is the possibility that the main accessories (the main board, power supply, and motor) will be damaged by trapped heat. At the same time, if the ambient temperature is low due to the properties of the material, the output quality deteriorates. In this study, we analyzed the temperature rise of the main accessories and the quality of the output by the heat bed when a chamber was added to an open-type 3D printer. We also compared the quality of the output due to the air flow with the temperature rise of the main accessories. Moreover, we found the optimal value. As a result of the quality analysis, it was finally confirmed that the case with the chamber at $95^{\circ}C$ was the best for the printing condition. In addition, in the absence of the chamber, the bending of the specimen was found to be large, and in the case of the chamber, the degree of bending was slightly decreased by 0.05 mm.

• 한국기계가공학회지
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• 제20권12호
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• pp.36-43
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• 2021

In this study, the optimal feed system and process conditions that can simultaneously minimize each warpage occurring in the two shape features of the 2P Header HSG, a connector part for automobiles, were determined through injection molding simulation analysis. First, we defined each warping deformation of the two features geometrically and quantified them approximately using the injection molding simulation data. For design optimization, a full factorial experiment was conducted considering the feed system, resin temperature, and packing pressure as design variables, and a follow-up experiment was conducted based on the analysis of the average warpage. In this study, an optimal design was generated considering both the warpage result and resin-saving effect. In the optimal design, the warpages of the two shape features were predicted to be 0.18 and 0.29 mm, and these warpages were found to meet the allowable limit of warpage, which is 0.3 mm, for part assembly.

• 한국산업융합학회 논문집
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• 제15권2호
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• pp.55-58
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• 2012

This study is concerned about the design and structural analysis of high integrated Chip Bonding Machine. Recently, many studies have been undergoing to reduce a working time in a field of Chip Bonding Machine. Chip Bonding Machine belongs to reduce a stand-by time by Chip Moving time. The developed system can save tool moving distance in small space than other machine. The analysis is carried out by SoldEdge & Ansys software.

• 천문학회지
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• 제55권1호
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• pp.11-22
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• 2022

We introduce the Transformable Reflective Telescope (TRT) kit that applies an aluminum profile as a base plate for precise, stable, and lightweight optical system. It has been utilized for optical surface measurements, developing alignment and baffle systems, observing celestial objects, and various educational purposes through Research & Education projects. We upgraded the TRT kit using the aluminum profile and truss and isogrid structures for a high-end optical test device that can be used for prototyping of precision telescopes or satellite optical systems. Thanks to the substantial aluminum profile and lightweight design, mechanical deformation by self-weight is reduced to maximum 67.5 ㎛, which is an acceptable misalignment error compared to its tolerance limits. From the analysis results of non-linear vibration simulations, we have verified that the kit survives in harsh vibration environments. The primary mirror and secondary mirror modules are precisely aligned within 50 ㎛ positioning error using the high accuracy surface finished aluminum profile and optomechanical parts. The cross laser module helps to align the secondary mirror to fine-tune the optical system. The TRT kit with the precision aluminum mirror guarantees high quality optical performance of 5.53 ㎛ Full Width at Half Maximum (FWHM) at the field center.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.577-578
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• 2008

• Journal of Nutrition and Health
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• 제54권5호
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• pp.534-546
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• 2021

밀키트 수요와 시장이 크게 확대되고 있는 시점에서 소비자의 밀키트 구매의도를 파악하고 식품 산업 및 소비자의 올바른 제품 선택을 위한 과학적인 근거자료를 마련하기 위하여 충남 일부지역의 젊은 성인을 대상으로 2021년 2월부터 3월까지 밀키트 구매 경험과 만족도, 인식도, 구매 의도를 분석하고 밀키트 구매 경험과 영양지수와의 관련성을 살펴보았다. 조사대상자 404명 중 남자는 153명 (37.9%)이었으며, 20-24세 181명 (44.8%), 25-29세 109명 (27.0%), 30-39세 114명 (28.2%)이었고, 밀키트 구매 경험이 있는 대상자는 194명 (48.0%)이었다. 밀키트 구매 경험은 남자보다 여자에서 유의하게 높았다 (p < 0.001). 밀키트 구매 금액은 1회 10,000-20,000원 미만이라는 응답이 가장 높았으며, 1달에 1회 미만과 식사용으로 구매하는 비율이 높았다. 밀키트 구매 장소는 대형할인마트가 가장 높았고, 조리의 편리성이 밀키트 섭취의 주된 이유로 나타났으며, 저녁에, 가족과 함께 섭취하는 비율이 높았다. 밀키트의 구매 경험자의 만족도는 5점 만점에 남녀 각각 3.6점, 3.7점이었으며, 재료의 신선함, 포장디자인, 적당한 양에서 여자의 만족도가 남자보다 유의하게 높았다 (p < 0.05). 밀키트 구매 경험자의 밀키트에 대한 인식도는 5점 만점에 남녀 각각 3.5점, 3.7점이었다. 밀키트 구매 의도는 5점 만점에 구매 경험자와 비경험자가 각각 3.8점과 3.2점이었으며 (p < 0.001), 남녀 각각 3.3점, 3.6점이었다 (p < 0.001). 성인 영양지수는 여자의 경우 식행동 항목에서 밀키트 구매 경험자 (45.7점)가 비경험자 (40.7점)보다 유의하게 높았다 (p < 0.05). 본 연구는 대상자의 수가 적고, 성별과 연령 분포가 고르지 못한 제한점을 가지고 있음에도 불구하고 새로운 HMR 유형의 밀키트의 구매행태를 살펴보고 밀키트 구매 경험이 여성의 식행동 영양지수와 유의미한 관련성이 있음을 제시함으로써 앞으로 소비자의 밀키트 구매 행태를 적극적으로 반영하여 궁극적으로 건강지향적인 밀키트 제품을 개발하는데 기여할 수 있을 것으로 기대한다.

• 한국기계가공학회지
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• 제16권1호
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• pp.63-69
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• 2017

The golden section search method is widely used to optimize a single design variable in many fields due to its superior advantages of search. In this paper, a new direct search method is proposed by modifying the search structure of the golden section search method; thus, it can be adapted in the optimization of a single design variable for the injection molding process. This proposed method is applied to determine an optimal gate position for the injection molding of a bezel of an automated teller machine for minimizing the injection pressure. Thus, an optimal gate position where the injection pressure is decreased by 4.5 MPa to that of the initial position was obtained with a small number of simulations. It is anticipated that the current proposed search method can be utilized as a practical tool for optimizing single variables for injection molding design.

• 한국기계가공학회지
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• 제18권11호
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• pp.1-8
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• 2019

In this study, we design the feed system and process conditions for a lamp garnish lens of an automobile. For this purpose, four design alternatives are presented and injection molding simulation analyses are performed. The optimal feed system is selected by considering the formability of the product and the cost of mold manufacture. The product formability is assessed by the weld line, warpage, sink mark and the maximum injection pressure, whereas the mold-making cost is estimated by the number of valve gates in the hot runner system. To improve the product formability, process conditions are optimized using an experimental design approach named one-factor-at-a-time. No weld line is generated as a result of the optimization. In addition, it is found the warpage and sink mark are reduced while the maximum injection pressure is increased, compared with those before the optimization.

• 국제초고층학회논문집
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• 제13권1호
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• pp.97-102
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• 2024

In this paper, we would like to share our ongoing research on global population and demographic shifts and the corresponding need for diverse responses. As population growth varies worldwide, the pressing issue is the current global housing shortage. The USA alone lacks 4 million homes, underlining the urgency for new construction and renewal of existing. Our focus is primarily on new building processes, which must also incorporate elements of renewal for future sustainability. Our research addresses several key questions: How will roles for construction professionals change? What should be the primary goal of the design process? What types of technologies are currently available, and which aspects of the process can be enhanced with AI? A significant part of our study is exploring sustainable building methods that reduce embodied carbon and increase speed of construction. Our goal is to extend the transition from smart homes to cities, analyzing the evolution towards smart communities and cities. A critical aspect of our research is the 'kit of parts concept, involving prefabrication and modular construction. This approach is essential for both rebuilding and new projects, potentially lowering costs in manufacturing and design for long term. Lastly, we present a detailed comparison of the construction industry with manufacturing.

• 디자인학연구
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• 제17권3호
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• pp.313-322
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• 2004

제품디자인은 소비자의 구매욕구를 충족시켜 매출에 직접적인 영향을 끼치는 역할을 한다. 본 연구는 2000년말 국회에서 도로교통법이 개정안 통과되면서 2001년 6월 30일부터 운전 중 휴대전화의 사용이 전면 금지됨에 따라 차량용 핸즈프리 제품의 인기와 판매량이 급증하였고 이에 따라 수많은 핸즈프리 제품들이 시장에 출시되어 판매경쟁을 벌이고 있는 현 시점에서 기존제품의 각종 데이터 분석과 소비자 설문조사 등을 통한 소비자입장에서 바라본 차별화 된 디자인으로 차량용 핸즈프리 시장에서 우위를 차지하기 위한 한 중소기업의 제품디자인 전 과정을 모델로 삼은 디자인 개발 연구이다. 본 연구에서 디자인 개발된 제품의 가장 큰 특징은 핸즈프리와 휴대폰 단말기와의 연결선을 없앤 거치형으로써 휴대전화단말기의 기종에 관계없이 모든 기종에서 호환되며, 기존 핸즈프리는 휴대전화의 이어폰 단자에 연결을 함으로써 사용자들로 하여금 승하차시 불편함을 해소시킬 수 있다는 장점에 있다. 이러한 연구를 통하여 기술의 궁극적인 목표가 상품화임을 인지하고 개발의 초기 단계부터 마지막 단계까지 디자인의 역할이 얼마나 중요한지를 보여 줌으로서, 디자인의 투자가치를 제고하는데 있다. 또한 제품의 발의단계부터 디자인 전개 그리고 상품화에 이르는 제품개발의 전 과정에 걸친 디자인프로세스를 구축함으로서 디자인분야의 중요성을 기업에 보다 정확히 전달하는데 디자인개발의 목적이 있다.