조명 융합형 자동차 내장부품의 빛 균일도 향상에 관한 연구

황윤섭 공주대학교 테크노융합대학원 2018 국내석사

Recently, various studies have conducted to improve the sensibility of automotive interior parts. Among them, the adoption of components fused with lighting is increasing. The lighting types are indirect lighting and line lighting and flat lighting. Indirect lighting and line lighting are frequently applied because of reasonable price. Line lighting is more preferred rather than indirect lighting since it guides light to more larger area uniformly but indirect lighting does locally. However, further development about homogeneous illumination is also necessary. The purpose of this study is to develop a light cover made of optical diffusive material and light guide made of transparent material for interior parts of homogeneous illumination. The light guide acts as a function of distributing one LED light throughout the entire part and the light cover enables light to spread evenly. Optical analyses were carried out according to various shapes of lamp guide and lamp clear, and optimal shape was derived. In addition, injection molding analyses were performed to determine gate positions. The luminance of the component in this study showed standard deviation of 0.8.

알루미늄(Al) 압출부품의 굽힘(Bending) 가공 불량 개선에 대한 연구

장동훈 공주대학교 테크노융합대학원 2020 국내석사

TV 산업은 경쟁이 치열하며 많은 알루미늄 합금을 사용하여 외관을 고급화 시킵니다. 알루미늄 합금 소재는 가공성 및 경량 성이 매우 우수하다. 그러나 가공 결함에는 많은 손실 비용이 발생합니다. 따라서 본 논문에서는 알루미늄 합금 부품의 가공 결함, 특히 굽힘 결함을 개선하는 주요 요인을 찾고 개선하기위한 연구를 진행하였다. 주요 원인은 부품과 설비의 고정부 거리와 굽힘 속도이다. 6시그마 통계 기법을 이용하여 두 가지 주요 요인에 대한 최적 조건을 찾았습니다. 주요 원인 개선으로 품질과 생산성이 모두 향상되었습니다. The TV industry is extremely competitive, and many aluminum alloys are used to enhance the appearance. Aluminum alloy material has good workability and light weight, so it is excellent in product weight reduction. However, there is a lot of loss costs for machining defects. Therefore, in this paper, research was conducted to find and improve the main factors for the improvement of machining defects, especially bending defects, of aluminum alloy parts. The main cause is the bending speed and the fixture distance between the parts and facilities. 6 sigma statistical techniques are applied to find the optimal conditions for the two main factors. Major cause improvements have improved both quality and productivity.

사출성형해석과 실험을 이용한 투명 플라스틱 화장품 용기의 사출성형 최적화 연구

조성기 공주대학교 테크노융합 대학원 2022 국내석사

Cosmetics container producers are currently transforming into a device industry to maximize efficiency with a representative multi-species small-volume production method. Due to the nature of external cosmetic containers, there are many products with high transparency, so they are classified as very difficult products in injection molding. In the case of thick products, it is not easy to secure reproducibility because the type of defects that occur during injection molding increases. Depending on the shape, pressure, speed, and temperature of the product, the stress of the product may increase or decrease. In addition, it is important to set cooling process conditions according to product thickness, and cooling should identify product characteristics and efficiently use water heaters, oil heaters, and cooling water to make it satisfactory. In this paper, an optimal injection molding machine was selected through injection molding analysis, and a study was conducted to classify, analyze, and solve the causes of defects with the highest frequency of occurrence into the following five types. The five types of defects are ice blue color, gate mark, weld line, flow mark, and sink mark. Ice Blue lowered the injection molding temperature from 220°C to 205°C to improve the gate mark, changed the injection molding rate from 20mm/s to 6mm/s, and raised the mold temperature from 40°C to 60°C, showing a clear difference between welding and flow labeling. It was most effective when 10seconds were added using holding time findings to resolve shrinkage defects.

공동주택 게스트하우스 사용자 분석을 통한 활용증대 방안에 관한 연구 : - 천안시, 아산시를 중심으로 -

박주한 공주대학교 테크노융합대학원 2021 국내석사

우리나라는 과거 산업발전을 통해 각 지방의 인구가 급격히 도시로 유입되었다. 이로 인해 도심에는 인구가 집중되면서 여러 가지 문제를 야기 시켰다. 그중 인간이 삶을 영유하기 위해 필요한 기본 의식주인 “주”에 해당하는 살 집이 부족한 현상으로 이어졌고 이를 해결하고자 정부와 민간건설사에서는 건축형태 중 아파트라는 공동주택유형을 대규모 공급하기 시작하였다. 이러한 대규모 공동주택 공급과 발 맞추어 부대·복리시설 역시 기존과 다른 종류의 시설들이 생겨나기 시작하였고 , 시대의 흐름에 따라 가족 구성원수는 점점 줄어드는 핵가족화가 되었다. 이는 손님 또는 친지들을 맞이할 공간이 마땅치 않아 고민하는 세대가 늘어나게 되었으며 이를 해결하기 위해 공동주택 단지 내 게스트하우스가 생겨나기 시작하였다. 시대의 요구에 의해서 공동주택 단지에서 설치하게 된 게스트하우스는 아쉽게도 건설사간 경쟁으로 인하여 과잉 공급 및 과장 광고로 고급화 및 특성화의 명분을 내세워 분양가격을 올리는 도구로 사용되고 있다. 이후 시설관리의 과제는 입주민이 떠안아야하는 현실이다. 게스트하우스는 법률적으로 명확한 설치기준을 가지고 있는 부대·복리시설과는 다르게 정확한 제도가 아직 정립되어 있지 않아 다른 시설과의 수준차이로 거주자들의 불편함과 더불어 예상치 못한 피해를 주고 있었다. 이처럼 최근 다양한 라이프 스타일 반영을 위해 급속도로 늘어나고 있는 공동주택 단지 내 게스트하우스에 대하여 , 본 연구는 충청남도 건축위원회 심의 기조에 따라 조성된 충남의 천안시, 아산시 공동주택단지 내 게스트하우스 6곳을 선정하여 현황조사 및 분석을 실시하였고, 거주자 및 관리자들의 설문조사를 통해 현재 사용하고 있는 게스트하우스의 문제점을 도출 시켜 이에 대한 게스트하우스 활용증대 방안을 제안하였다. 첫째, 게스트하우스를 사용하는 사용자 및 일반 거주자들 사이에 가장 불만을 드러냈던 소음에 대한 문제를 해결하기 위해 공동주택 단지 조성 초기 계획단계에서부터 일반 거주자들과의 동선 및 공간이 겹치지 않도록 단지 중심에 이격 배치하도록 한다. 둘째, 게스트하우스의 유무를 알 수 있도록 입주시 사용 매뉴월 배포 및 모바일 웹을 이용하여 보다 효율적이고 적극적인 게스트하우스 이용을 돕는다. 셋째, 기본적으로 게스트하우스는 복리시설로 인식되어져 외부 숙박시설의 서비스와 비교 하게 된다. 이는 이용가격에 대한 불만으로 연계 되어 졌고, 이문제점을 해결 하기 위해 게스트하우스의 운영비용을 공개하여 결코 외부의 숙박시설에 견주어 부족함이 없음을 인식 시킨다. 넷째, 법률적인 설치기준이 마련되지 않아 단지별 시설 수준차이와 불 공평한 공간의 쾌적함을 해소하기 위해 충청남도 건축위원회 심의 기조에만 있던 게스트하우스 설치기준을 확대하여 , 주택건설기준 등에 관한 규정에도 추가 제안하여 보다 공정한 이용환경을 제공 받을 수 있도록 한다. In the past, through industrial development in Korea, the population of each region has rapidly flowed into cities. This caused various problems as the population was concentrated in the city center. Among them, there was a shortage of living houses corresponding to the basic food, clothing, shelter, and shelter necessary for humans to live, and to solve this, the government and private construction companies began to supply large-scale apartments called apartments. In keeping with the supply of such large-scale apartment houses, facilities and welfare facilities of a different kind began to appear, and as the times passed, the number of family members became increasingly reduced, becoming a nuclear family. This has resulted in an increasing number of generations worrying about the lack of space to welcome guests or relatives. Due to the demands of the times, guest houses installed in apartment complexes are unfortunately used as a tool to raise the pre-sale price with the cause of luxury and specialization due to excessive supply and exaggerated advertisements due to competition among construction companies. Since then, the task of facility management is a reality that residents must bear. Unlike subsidiary and welfare facilities that have legally clear standards for installation, guest houses have not yet established an accurate system, so the difference in level with other facilities caused inconvenience and unexpected damage to residents. For guest houses in apartment complexes, which are rapidly increasing to reflect various lifestyles in recent years, this study selected 6 guest houses in the apartment complexes in Cheonan and Asan, Chungnam, which were created in accordance with the deliberation of the Chungcheongnam-do Architecture Committee. A survey and analysis were conducted, and through a survey of residents and managers, problems of the currently used guest house were derived and a plan to increase the utilization of the guest house was proposed. First, in order to solve the noise problem that was most dissatisfied between users and general residents of guesthouses, from the initial planning stage of the construction of the apartment complex, it was separated from the center of the complex so that the movement lines and spaces with ordinary residents do not overlap. Place it. Second, we help more efficient and active guest house use by distributing a usage manual when moving in and using the mobile web so that you can know the existence of a guest house. Third, guest houses are basically recognized as welfare facilities, and are compared with services of external accommodation facilities. This has been linked to dissatisfaction with the price of use, and in order to solve this problem, the operating cost of the guest house is disclosed, so that it is recognized that there is no shortage compared to external accommodation facilities. Fourth, in order to resolve the difference in facility level by complex and the unfair space comfort due to the lack of legal installation standards, we expanded the guest house installation standards, which were only the basis of the deliberation of the Chungcheongnam-do Construction Committee, and proposed additionally to regulations on housing construction standards, etc. To ensure that a more fair use environment is provided.

ICT 기반의 친환경 자동차 보수도장 방안에 관한 연구

박종선 공주대학교 테크노융합대학원 2020 국내석사

최근 환경오염에 대한 소비자의 인식이 높아졌고, 휘발성유기화합물에 대한 환경규제에 대한 정부의 수요도 증가했다. 그 결과 유기용제 대신 수용성 페인트의 사용은 건강에 덜 해롭고 작업환경은 휘발성 유기화합물의 배출오염원 중 하나로 지적되는 기존의 유용한 페인트보다 좋다. 자동차 수리 및 도장 작업은 제품 표면에 페인트를 칠해 외관을 개선하고 표면을 보호하는 등 제품의 부가가치를 높이는 최종 공정이다. 자동차 사고 손실량은 매년 증가하고 있어 자동차 생산에 사용되는 도료뿐만 아니라 수리 도료에 대한 수요가 지속적으로 증가하고 있으며 환경 규제와 관련해 친환경 수용성 도료의 사용이 제한되고 있다. 단, 보수 도장에 수용성 도료의 사용에 관한 자료는 대부분 도장 제조업체가 제공하고 있어 도장 공정의 효율성과 작업 효율성, 체계적인 공정에 관한 정보가 필요하다. 본 문서는 자동차 수리 및 도장 시장에서 VOCs의 규정에 의한 수리 도장 시장의 문제점과 차량 친환경 수리 도장 시스템의 활성화에 대한 해결책을 제시한다. 이를 통해 환경친화적인 보수도장 시장에 대한 이해와 공정 표준화 등을 확대함으로써 보수도장 기술자의 업무의 효율성과 안전성을 높일 수 있을 것으로 기대된다. 친환경 보수도장 표준공정, 녹용성 색채시스템, ICT를 활용한 보수도장 시스템 전산화 등 친환경 보수도장 시스템에 대한 향후 연구는 계속되어야한다. Consumer awareness of environmental pollution has recently increased, and government demand for environmental regulations for volatile organic compounds has also increased. As a result, the use of water-soluble paints instead of organic solvents is less harmful to health and the working environment is better than the existing useful paint used, which is pointed out as one of the sources of emission pollution of volatile organic compounds. Repair and painting work for automobiles is the final process for enhancing added value of products such as applying paint on the surface of products to improve their appearance and protect their surfaces. The amount of vehicle accident loss is increasing every year, which means that the demand for repair paints as well as paints in automobile production is continuously increasing, and the use of eco-friendly water-soluble paints is limited in relation to environmental regulations. However, the data on the use of water-soluble paints for repair painting are mostly provided by the paint manufacturer, so information about the efficiency of the painting process, the efficiency of the work, and the systematic process are needed. This document provides solutions for the problem of the repair painting market and the activation of the vehicle eco - friendly repair painting system under the regulations of VOCs in the auto repair and painting markets. By doing so, it is expected to enhance the efficiency and safety of the work of repair painting engineers by expanding understanding of the environment-friendly repair painting market and standardizing process. Future research will continue on eco - friendly repair painting systems, such as standard process for eco - friendly repair painting, green - soluble color system, and computerization of repair painting system using ICT.

엘리베이터 가이드 레일 고정 브라켓의 방진라이너 적용효과에 관한 연구

노승권 공주대학교 테크노융합대학원 2019 국내석사

엘리베이터를 이용하는 고객들의 성향은 대체적으로 감성품질 즉, 진동과 소음에 민감하다. 과거 고층아파트 보급 초기에는 엘리베이터 설치 자체만으로도 고객들한테 큰 장점이 되어 발생되는 진동 및 소음에 대하여 큰 분쟁거리가 되지 않았다. 그러나 엘리베이터가 일상생활 필수품이 된 지금에는 편리성을 뛰어넘어 정숙성에 대한 문제가 분쟁의 한 축이 되고 있는 실정이다. 특히, 고층아파트 승강로 인접세대에서는 엘리베이터 운행에 의해 발생되는 공기전달음과 고체전달음이 진동 및 소음문제로 대두되어 암소음이 적은 야간에 수면방해 등을 일으켜 입주자들의 불만을 야기하고 있다. 따라서 본 연구에서는 고층아파트 승강로 인접세대에 대한 진동 및 소음저감대책의 일환으로 엘리베이터 가이드 레일 고정 브라켓에 방진라이너를 적용 후 그 효과를 연구하였다. 연구내용은 최근 설치한 공동주택 엘리베이터 운행통로에 카(CAR)와 카운터(CWT) 측에서 가이드 레일, 고정 브라켓, 세대 옹벽에 가속도센서를 설치하고 반복 운행에 따른 진동 값을 측정하였다. 측정된 원(Raw) 데이터를 토대로 소음·진동 측정분석기로 방진라이너 적용 유무에 따른 각 측정 위치별 진동 값에 대하여 FFT(Fast Fourier Transform)비교분석을 진행하였다. 그리고 분석된 결과를 바탕으로 방진라이너 적용 시의 방진성능을 분석하였다. 방진라이너 적용유무에 따른 연구결과는 1) 방진라이너가 미 적용된 카 및 카운터 측은 가이드 레일에서 발생한 진동이 고장 브라켓과 세대 옹벽에도 동일한 형태로 전달되고 있음을 확인하였고, 2) 방진라이너가 적용된 카 및 카운터 측은 가이드 레일에서 발생한 진동과 무관하게 고장 브라켓과 세대 옹벽에서의 진동은 일정한 수준을 유지하고 있음을 확인하였다. 3) 방진라이너의 성능을 분석한 결과 카 측에서는 약 65%, 카운터 측에서는 약 90%의 방진성능이 있음을 확인하였다. 그러므로, 엘리베이터 가이드 레일 고정브라켓의 방진라이너 적용에 따른 진동저감효과는 상당히 만족할 만한 수준이라고 사료된다. 끝으로, 방진라이너와 제진빔(Damping Beam) 적용 현장에 대한 비교분석을 진행한 결과, 방진라이너를 적용할 경우 제진빔 적용에 비해 엘리베이터 운행통로(승강로) 면적은 7 ~ 22% 줄어들고, 재료비 및 설치비는 3,80,000원 ~ 9,800,000원의 절감효과가 있음이 확인 되었다. 이와 더불어 경량의 방진라이너 적용할 경우 중량의 제진빔 적용에 비해 설치작업자들의 안전사고 예방에도 효과가 클 것으로 사료된다. The trend of customers using elevators is sensitive to riding quality, that is, vibration and noise. In the beginning of elevator installation in high rise apartment in the past, customers had a big opportunity only with the installation in their apartment building, somewhat vibration an noise ignored. However, as the elevator has been an essential product used for everybody, so ride quality of vibration and noise has been an essential factor and sometimes there has been conflict due to customers dissatisfaction. Especially for residents near to hoistway of high rise apartment building, vibration and noise caused by air-transmitted or solid-transmitted during elevator running make them inconvenient and sleeping-disturbed. Therefore, this study handles with an application of vibration isolation liners fixed into between elevator guide rails and their effect in order to reduce vibration and noise. Installing acceleration sensors on guide rails, their fixing brackets and hoistway wall in car side and counterweight side, then vibration values were measured during repeatedly running of elevator. Based on raw data measured, FFT(Fast Fourier Transform) comparison analysis has been implemented together with vibration and noise analyzer, for the effect of vibration isolation liners and vibration isolation performance has been evaluated. The result of vibration isolation liners application is;1) For non-application, vibration and noise are transmitted into guide rails, their fixing brackets and hoistway wall in both car and counterweight side.2) For the application, they are transmitted but3) The level of vibration and noise is reduced around 65% in the car side and around 90% in the counterweight side, so the application has a vibration isolation effect significantly. Finally speaking, as the result of comparison analysis on sites applied for vibration isolation liners and damping beams, vibration isolation liners needs less 7 ∼ 22% area of hoistway section, material cost and installation cost 3,800,000KRW ~ 9,800,000KRW less, compared to damping beams application. Furthermore, lightweight vibration isolation liners application has more advantage for installers in terms of safety, compared to heavy damping beams application.

Ajax에 기반한 단일 페이지 커뮤니케이션 시스템 구현에 관한 연구

정현주 공주대학교 테크노융합대학원 2016 국내석사

국가직무능력표준(NCS)기반 편집디자인 교육과정 개발에 관한연구 : 민간직업훈련기관 국가기간전략산업 직종훈련 중심으로

엄정미 공주대학교 테크노융합대학원 2018 국내석사

갈수록 늘어만 가는 실업률과 4년대 대졸자의 전공미스매치, 전문계고 졸업자의 상급학교 진학에 따른 산업체의 구직자 부족 등의 문제를 타계할 방안으로 정부에서는 산업체에서 요구하는 실무능력을 갖춘 인재를 양성하기 위하여 국가 직무능력표준(National Competency Standards 이하 NCS)을 도입하여 교육·훈련기관에 적극 활용하기를 유도하고 있다. 그러나 NCS를 기반으로 한 교육과정이 훈련기관에서 전면적으로 실시되고 있음에도 불구하고, 다수의 강사들과 교육·훈련기관들이 NCS에 대한 인식 부족으로 인하여 교육과정 개발에 어려움을 겪고 있으며, 교육·훈련생들 또한 일률적인 NCS이수체계에 따른 교육과정을 이수함에 어려움을 호소하고 있다. 빠르게 변화하는 시대에 대응하는 디자인 교육은 단순히 디자인 방식을 가르치기만 하는 교육이 아닌, 창의력을 바탕으로 한 디자인적 사고(design thinking)로 실생활에 스며들 수 있는 교육이어야 한다. 이러한 시대적 흐름에 맞춘 교육이 교육 기관 뿐만 아니라 디자인 분야 이·전직을 희망하는 실직자들에게도 이루어 져야 함에도 불구하고 디자인 교육 또한 일률적인 NCS교육방식에서 예외가 아니다. 이러한 이유로 2017년도 상반기 전국 훈련기관에서 운영된 NCS기반 디자인 분야 중 편집(편집디자인) 교육과정을 조사하여 문제점을 분석하였으며, 문헌연구를 통해 편집디자인 프로세스에 따른 디자인과정 필요요소를 추출하고, kidp(한국디자인 진흥원)의 디자인인력 수급 실태 및 교육훈련 수요조사 (2016.11)중 산업체의 만족도 조사에서 불만족부분의 이유로 나왔던 부족한 실무능력을 보강하는 방법으로 현재 대학에서 실무중심 교육을 위하여 시행하고 있는 캡스톤디자인 과목을 조사하여 그 운영 방법을 분석하고, 훈련 과정을 개발하는데 기초자료로 삼아, 기존 NCS기반 편집디자인교육의 문제점을 파악해 개선점을 제시하여 디자인 전공자가 아닌 비전공 디자인 과정 담당 교사들도 디자인 교육을 실행할 수 있는 체계적이고 창의적인 편집 디자인 교육의 가이드라인을 제시하여, 향후 편집 디자이너로 일하고자 하는 실업자 및 이·전직 희망자에게 직업훈련기관에서의 바람직한 편집디자인 교육이 이루어지는데 기초자료를 제공하고자 하는데 연구의 목적이 있다. The Korean government is encouraging the educational institutes all over the country to introduce a new system named NCS (National Competency Standards) to solve the problems of increasing unemployment, wrong major choice of four-year college graduates, the shortage of manpower due to entering to upper school of special purpose high school graduates and so on. However, even though training courses which are based on NCS are being conducted widely, lots of instructors and institutes are having difficulty developing curriculums due to their lack of understanding. Also, students are struggling to complete the training courses based on one-size-fits-all curriculums of NCS. In order to keep up with the rapidly changing society, design education should be conducted not only by teaching the design method, but also by drawing students’ creativity so that it could be applied into real life. It should be conducted for students who want to change their jobs into design field as well as educational institutes. However, the design education is no exception to the one-size-fits-all NCS system. For these reasons, this study aims to analyze problems by researching NCS based editorial design training courses that were offered by educational institutes from all over the country in the first half of 2017, to extract necessary components from editorial designing process by the literature review, to solve the lack of practical ability that was selected as a reason of dissatisfaction in ‘Report on the Actual Conditions of Supply and Demand of Design Industry Personnel and Education and Training Demand Survey Results (2016.11)’ conducted by KIDP(Korea Institute of Design Promotion) by analyzing operating method of capstone design courses which is currently enacted in colleges for practical education, to suggest a guideline of systematic and creative editorial design education that can be implemented not only by educators who studied design in university, but also by educators who did not major in design by recognizing problems, finding points to improve, and to provide baseline data about the desirable editorial design education for people who want to work in editorial design industry.

공동주택 콘크리트 슬래브 시공편차에 따른 진동 특성

김재성 공주대학교 테크노융합대학원 2018 국내석사

The modern architecture increasingly becomes high-rise, large-scale and crowding with the increase of the population density and the development of building technologies, day by day, and accordingly, exclusive residential housings, too, become large-scale, and apartment houses and high-rise mixed-use houses tend to increase. According to the 2014 statistics, the ratio of apartments takes up 49.6%, nearly a half. Especially, in the metropolitan areas, the ratio of apartment houses is high. Apartment houses provide pleasant residential space and are preferred as convenience is added up as living space where residence and commerce are mixed. Most multiplex housing like apartment house is in the system of a wall structure consisting of walls and slabs, and individual households share the walls and floors. Various problems appear accompanied by this structure of apartment houses, and in particular, the problem of floor impact sound between houses is a very big complaint among the residents. In this environment, as a standard for the performance related to floor impact sound in apartment houses, enforced on April 23, 2004, for the standard structure, the thickness of the slab should be more than 180mm, and the light-weight impact sound should be lower than 58bB. Later, in the act, enforced on July 1, 2005, for standard floor structure, the thickness of the slab should be increased to more than 210mm, the light-weight impact sound should be lower than 58dB, and the heavy-weight impact sound should be lower than 50dB. The enforced act allows either the specification standard of the standard floor structure or the performance standard of the certified floor structure. For the specification standard, the construction according to the floor section designated by the Minister of Ministry of Land, Infrastructure, and Transport is judged to meet the regulations, and for the recognition of performance, it is recognized as meeting the regulations, if the products certified by the certification agency are used. All adopt the design performance standard, not the on-site performance standard, and with new testing methods on May 7, 2014, standard floor structure and certified floor structure were combined, and, the related standard was changed unconditionally to the slab thickness, more than 210mm. This, also, is used as a design performance standard in the standardized standard laboratory. However, on the site, the design performance cannot be the same as the on-site performance, but there is somewhat much difference in performance between standard laboratory and the site. There are various variables as the causes for this, but there are reports on the cases that show somewhat big differences in the performance of floor impact sound despite resilient materials were constructed in the same way. This is the differences in the character and thickness of slab concrete excluding resilient materials affected the performance of the floor impact sound. Thus, this study would investigate the vibration characteristics according to the conditions like the thickness of the concrete slab, which is the most basic of the apartment house structure. An experiment for this was on the floor vibration characteristics according to the thickness of the slab in the site, and this study analyzed the impacts of changes in the characteristics such as the compression strength of the slab concrete, the thickness, and smoothness of the slab on the floor vibration characteristics, except the resilient materials for floor noise reduction. As a result of an analysis of the results derived from this study, the conclusions are summarized as follows: First, Even in the same apartment, there was a difference in the thickness of the concrete slab of each household, and it was found that there was a difference in smoothness to a certain extent. Second, The characteristics of the vibration level differ depending on the deviation in the thickness and the compression strength of the slab, but overall, it was found that it showed the largest value around 25Hz, and the biggest vibration took place at the central point (P3) of the part measured. Third, When the vibration characteristic was checked, classifying the average thickness of the slab measured into less than 200mm, 200mm-210mm and more than 210mm, it was found that the vibration level decreased somewhat with the increase of the thickness by the deviation. Fourth, When 1/3 octave band was analyzed, classifying the slab thickness into three levels, the lowest vibration level was measured in the slab more than 210mm around 40Hz. Like above, in the result of this study, it was found that the thicker the concrete slab and the less the smoothness, the lower the vibration level became. However, since the floor height of each floor in an apartment house is fixed, the thicker the concrete slab, the less the mortar finish and the less the aerated concrete thickness becomes. Accordingly, in the present result, it turns out that the thicker concrete is more advantageous for the reduction of vibration level, but it is judged that the vibration level would differ depending on the change of the construction thickness of each part when the slab construction is completed. Thus, it is judged that it would be necessary to conduct an analysis of the vibration level according to changes, like the construction deviation of all parts that constitute the slab, in the future.

비구면 렌즈의 다층 사출 공법에 관한 연구 : 비구면 렌즈의 사출

최기환 공주대학교 테크노융합대학원 2020 국내석사

Recently, automobile fuel efficiency technologies have been receiving attention due to stricter environmental regulations. The car fuel efficiency improvement technology is a method of improving the efficiency of power systems such as engine and powertrain, reducing driving resistance to minimize energy loss when driving a vehicle, and finally reducing the weight of a vehicle. Among them, the most efficient method is to make parts lighter, which can be expanded and applied to various parts due to the development of materials and molding techniques. The aspherical lens of the projection module that comprises the automobile's headlights has been applied with glass. Glass-applied aspherical lenses are one of the heavy parts because the processing time is long and thick. In this study, plastic aspherical lenses were developed to make them lighter. Because the aspherical lenses are thick, plastic molding takes longer to cool than glass processing. Therefore, plastic aspherical lenses of multi-layered structures were designed and analyzed to reduce molding time and improve hindrance. Based on injection molding analysis, molds were designed and manufactured, and plastic aspherical lenses were molded. It was found that the dimensional error of the developed plastic aspherical lens is 17 um and productivity is improved by 24% over a single injection. 최근에는 보다 엄격한 환경 규제로 인해 자동차 연비 기술이 주목을 받고 있다. 자동차 연비 개선 기술은 엔진과 파워트레인 등 동력 시스템의 효율을 높이고 주행 저항력을 줄여 차량 주행 시 에너지 손실을 최소화한 뒤 최종적으로 차량 중량을 줄이는 방식이다. 이 중 가장 효율적인 방법은 부품의 경량화를 위한 것으로, 재료의 개발과 성형기술의 발달에 따라 부품의 확장과 적용도 가능하다. 자동차의 헤드라이트를 구성하는 프로젝션 모듈의 비구면 렌즈가 유리로 적용되었다. 유리로 적용된 비구면 렌즈는 처리 시간이 길고 두꺼워 무거운 부품 중 하나이다. 이 연구에서는 플라스틱 비구면 렌즈를 개발하여 가벼워지게 하였다. 비구면 렌즈가 두꺼워 유리 가공보다 플라스틱 몰딩이 식는데 더 오래 걸린다. 따라서 다층 구조의 플라스틱 비구면 렌즈를 설계, 분석하여 성형 시간을 단축하고 저해요인을 개선하였다. 사출 성형 분석을 바탕으로 금형을 설계, 제작하였으며 플라스틱 비구면 렌즈를 성형하였다. 개발된 플라스틱 비구면 렌즈의 치수 오차는 17미크론이고 한 번 주입했을 때보다 생산성이 24% 향상되는 것으로 나타났다.