자동차 부품 카시트 프레임 검사를 위한 머신비전 개발

넬슨안드레이(Nelson S. Andres),장봉춘(Jang, Bong-Choon) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.4

본 논문에서는 생산 현장에서 작업자가 육안으로 하고 있는 자동차 부품 카시트 프레임의 전수(全數) 검사 를 위한 머신 비전 시스템의 개발에 관한 연구를 다룬다. 이러한 제안된 머신비전 검사시스템은 생산 현장에서 날로 증가하는 품질 향상에 대한 요구와 수요를 충족시키기 위해 설계되었다. 이 컴퓨터 기반의 검사시스템은 실시간으로 제품의 다양한 결함들에 대한 품질 검사를 할 수 있도록 설계되었다. 본 연구의 검사방법에 사용된 소프트웨어는 NI-LabVIEW가 사용하였으며, LabVIEW Vision 이미지 함수를 사용하여 검사 프로그램을 개발하였다. 개발된 검사 알고리즘은 생산 부품의 실시간 검사에 적용 될 수 있으며, 검사 영역과 설정 값을 비전 시스템 운용자가 설정할 수 있도록 프로그램이 만들어져 검증되었다. 제안된 검사시스템은 카시트 프레임 검사를 성공적으로 수행하였다. This study presents the development of a machine vision inspection system(MVIS) purposely for car seat frames as an alternative for human inspection. The proposed MVIS is designed to meet the demands, features and specifications of car seat frame manufacturing companies in striving for increased throughput of better quality. This computer-based MVIS is designed to perform quality measures by detecting holes, nuts and welding spots on every car seat frame in real time. In this study, the NI Vision Builder software for Automatic Inspection was used as a solution in configuring the aimed quality measurements. The techniques for visual inspection are optimized through qualitative analysis and simulation of human tolerance on inspecting car seat frames. Furthermore, this study exemplifies the incorporation of the optimized vision inspection environment to the pre-inspection and post-inspection subsystems. The system built on this proposed MVIS for car seat frames has successfully found the possible detections.

영화 <드라이브 마이 카>의 다층적 상호텍스트성 고찰

배기형,김치호 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.9

본고에서는 하마구치 류스케 감독의 <드라이브 마이 카>의 서사 전략을 다층적 상호텍스트성을 중심으로 고찰한다. <드라이브 마이 카>는 ‘이야기를 품고 있는 이야기 속의 이야기’ 형식으로 액자식으로 구성되어 있는데, 상호텍스트성의 인지는 <드라이브 마이 카>의 스토리텔링 전략을 짚어보는 데에 중요한 의미를 갖는다. 왜냐하면 이 영화는 하루키의 <여자 없는 남자들>에 수록된 동명의 단편과 또 다른 단편들을 차용하여 각색하였으며, 영화 속에 포함된 여러 이야기들이 중첩되어 전체의 서사를 이룬다. 따라서 <드라이브 마이 카>를 잘 이해하기 위해서는 영화 속 텍스트들의 유기적 의미 관계를 파악하는 것이 중요하다. <드라이브 마이 카>의 서사를 이해한다는 것은 곧 영화 속에 포함된 다중의 텍스트 내용들을 상호텍스트적으로 연결하는 과정이기도 하다. <드라이브 마이 카>는 주인공 가후쿠의 아내 오토가 말하는 꿈의 이야기와 극중 <바냐 아저씨>가 액자 속 텍스트로 다층적으로 또 입체적으로 전체 영화의 서사와 정교하게 연결되어 있다. 하마구치는 이러한 <드라이브 마이 카>의 상호텍스트성 서사 전략을 통해 관객을 향한 핍진성을 강화한다. 아울러 <드라이브 마이 카>의 은유와 성격화된 공간은 치유와 성장의 서사를 관객들에게 효과적으로 전달하는 데에 기여한다. In this article, the narrative strategy of Ryusuke Hamaguchi's <Drive My Car> is researched focusing on multi-layered intertextuality. <Drive My Car> is framed in the form of a ‘story in a story that embraces a story’, and the recognition of intertextuality has an important meaning in examining the storytelling strategy of <Drive My Car>. Because this movie was adapted from the short stories from Haruki's <Men Without Women>, the various stories included in the film overlap to form the overall narrative. Therefore, in order to understand <Drive My Car> properly, it is important to understand the organic semantic relationship between the texts in the movie. Understanding the narrative of <Drive My Car> is also the process of interconnecting textual content of multiple texts included in the film. In <Drive My Car>, the dream story told by Otto, Gafuku's wife, the main character, and <Uncle Vanya> in the play are elaborately linked to the narrative of the entire film in layers and three dimensions with text in a frame. Hamaguchi reinforces the need for the audience through the intertextual narrative strategy of <Drive My Car>. In addition, the metaphor and personalized space of <Drive My Car> contributes to the effective delivering the narrative of healing to the audience.

저가 입문용 1인승 레이스카 Tubular Space Frame의 비틀림 강성 최적설계

장운근(Jang, Woongeun) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.10

일반적으로 고성능의 레이스카나 스포츠카 시장에서 차량의 프레임 설계는 매우 중요한 기술적 요소로 작용하고 있다. 차량의 비틀림 강성은 차량의 코너링 성능에 많은 영향을 주기 때문에 레이스 차량에 있어 우수한 성능의 프레임이라 는 것은 높은 비틀림 강성을 가진다는 것을 뜻한다. 본 연구에서는 입문용 포뮬러 레이스카 프레임의 최적 비틀림 강성 설계 를 위하여 다구찌 직교배열표를 가진 실험계획법과 유한요소 해석 기술을 이용하였다. 이러한 기법을 통해서 얻은 결과가 초기설계단계에서 보다 14.5%의 무게를 감량함과 동시에 무게 대비 비틀림 강성 10.7%의 개선 효과를 볼 수가 있었다. 따라 서 본 연구에서는 직교배열표를 가지는 실험계획법을 이용한 구조해석이 설계 초기단계에서 저가형 레이스 차량에 사용되는 Tubular space frame 설계에 매우 유용함을 나타내고 있다. Generally, the frame design of a vehicle is a critical technology that plays an important role in the racing and high performance sports car market. The high performance of race car frame means that it requires high torsional stiffness because it directly affects the cornering behavior of the race car. The optimal design for the frame of a low-cost single seat race car was carried out using the DOE (Design Of Experiments) with Taguchi's orthogonal array and FEM (Finite Element Method) analysis to secure sufficient torsional stiffness in this paper. According to the results by DOE and FEM analysis, the optimal design case produced improved 10.7% and 14.5% improvement in each stiffness-to-weight ratio and frame weight than in the early design step. Therefore, this paper shows that the optimal design with Taguchi's orthogonal array is very useful and effective for designing a tubular space frame of a low-cost single seat race car in the early design step.

재료특성을 고려한 자동차 시트프레임의 변형량 및 응력해석에 관한 연구

이규성,윤준규 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.2

In this study, analysis on the stiffness of the headrest, the stiffness of front-rear load and the torsion of cushion frame was performed using finite element method in order to investigate the properties of the stress-deformation by material characteristics according to the test requirements of FMVSS (Federal Motor Vehicle Safety Standard). The results are shown that AZ31 (Mg alloy) and A365 (Al alloy) with low modulus of elasticity and density have higher strain rate than steel in terms of stress-deformation and meet the standards for safety within 108 mm of the maximum amount of deformation. Considering it’s safety and durability, however, the selection of AZ31 for light weight seems difficult to gain the reliability because it causes an excessive deformation, and therefore it is not expected to be used for recliner where stress is concentrated and also the bracket linking rail and cushion frame.

자작 자동차 프레임의 형상에 따른 구조 및 피로 해석에 관한 연구

최계광,조재웅 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3

In this study, the structural and fatigue analyses were carried out according to the shape of the self-made car frame. As a result of structural analysis, all models are shown to have the weak strength and large deformation, as the equivalent stress increases at the forward part of the impact force. It can be seen that model 3 is deformed less than other models 1 or 2. And model 3 with the truss structure prevents the great deformation from the collision. In case of irregular fatigue loads, the fatigue life of the ‘Sample history’ increased by about 59.3 times compared to the ‘SAE bracket history’ under extreme fatigue load conditions, indicating that the fatigue load condition of the ‘Sample history’ were stable. The fatigue life and deformation of model 3 among all models are significantly different to models 1 and 2. If the research results are applied to the design of self-made cars, it will be useful for improving the durability and preventing the damage. The results of this study can be effectively utilized to investigate the values of stresses and deformations, and fatigue lives without the experiments of fracture and fatigue according to the shape of the car frame.

충돌해석을 이용한 전기자동차 복합소재 프레임 설계에 관한 연구

안태경(Tae-Kyeong Ahn),이영진(Young-Jin Lee),이상찬(Sang-Chan Lee) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.2

In this study, we designed car frames for collision analysis using carbon fiber reinforced polymer (CFRP) as the lighter composite material. The collision conditions were 100 percent frontal collision, 40 percent frontal collision, and 90 degrees side collision. The collision analysis measured the maximum stress at velocities of 20km/h and 40km/h for each condition and evaluated the vulnerable points in the car frame. Additional supports have been designed both to improve the weak points in existing vehicle frames, and to be taken into account when new parts are assembled. Our collision analysis compared the results of maximum stress on the car frame with and without the support.

해석수준과 메시지 프레이밍에 따른 자율주행택시의 사용의도에 관한 연구

윤승정(Seong Jeong Yoon),김민용(Min Yong Kim) 한국지능정보시스템학회 2018 지능정보연구 Vol.24 No.3

The purpose of this study is to analyze the difference of interpretation level and intention to use message framing when autonomous vehicle, which is emerging as the product of 4th industrial revolution, is used as taxi, Interpretation level refers to the interpretation of a product or service, assuming that it will happen in the near future or in the distant future. Message framing refers to the formation of positive or negative expressions or messages at the extremes of benefits and losses. In other words, previous studies interpret the value of a product or service differently according to these two concepts. The purpose of this study is to investigate whether there are differences in intention to use when two concepts are applied when an autonomous vehicle is launched as a taxi. The results are summarized as follows: First, the message format explaining the gain and why should be used when using the autonomous taxi in the message framing configuration, and the loss and how when the autonomous taxi is not used. Messages were constructed and compared. The two message framing differed (t = 3.063), and the message type describing the benefits and reasons showed a higher intention to use. In addition, the results according to interpretation level are summarized as follows. There was a difference in intentions to use when assuming that it would occur in the near future and in the near future with respect to the gain and loss, Respectively. In summary, in order to increase the intention of using autonomous taxis, it is concluded that messages should be given to people assuming positive messages (Gain) and what can happen in the distant future. In addition, this study will be able to utilize the research method in studying intention to use new technology. However, this study has the following limitations. First, it assumes message framing and time without user experience of autonomous taxi. This will be different from the actual experience of using an autonomous taxi in the future. Second, self-driving cars should technical progress is continuing, but laws and institutions must be established in order to commercialize it and build the infrastructure to operate the autonomous car. Considering this fact, the results of this study can not reflect a more realistic aspect. However, there is a practical limit to search for users with sufficient experience in new technologies such as autonomous vehicles. In fact, although the autonomous car to take advantage of the public transportation by taxi is now ready for the road infrastructure, and technical and legal public may not be willing to choose to not have enough knowledge to use the Autonomous cab. Therefore, the main purpose of this study is that by assuming that autonomous cars will be commercialized by taxi you can do to take advantage of the autonomous car, it is necessary to frame the message, why can most effectively be used to find how to deliver. In addition, the research methodology should be improved and future research should be done as follows. First, most students responded in this study. It is also true that it is difficult to generalize the hypotheses to be tested in this study. Therefore, in future studies, it would be reasonable to investigate the population of various distribution considering the age, area, occupation, education level, etc. Where autonomous taxi can be used rather than those who can drive. Second, it is desirable to construct various message framing of the questionnaire, but it is necessary to learn various message framing in advance and to prevent errors in response to the next message framing. Therefore, it is desirable to measure the message framing with a certain amount of time when the questionnaire is designed.

소형 하이브리드 자동차 시장에서 소비자의 추구 가치와친환경 메시지 프레이밍(message framing)이제품 선호도에 미치는 영향

정보희,김한구 한국마케팅관리학회 2014 마케팅관리연구 Vol.19 No.3

오늘날 친환경 소비는 기업과 소비자, 정책적 영역에 이르기까지 그 중요성이 점차 커지고 있다. 그럼에도불구하고, 친환경 자동차 소비 시장은 정체되어 있는 상황이다. 본 연구는 이러한 현실적인 문제에 대한 해결방안으로 시장을 세분화하여 보다 효과적인 친환경 자동차 소비 촉진 방법을 제시하였다. 보다 구체적으로,본 연구는 소비자들이 자동차에 대해 추구하는 가치와 소형 친환경 자동차에 대한 태도 사이의 관계를 살펴보고, 가치 추구 행태에 따른 효과적인 메시지 프레이밍과 가격전략이 존재하는가에 대해 탐색해보았다. 분석결과 자동차에 대한 소비자의 경제적, 환경적 가치는 소형 하이브리드 자동차 선호에 긍정적인 영향을 미쳤으나, 자동차에 대한 사회적 가치는 소형 하이브리드 자동차 선호에 부정적인 영향을 미쳤다. 그리고 경제적 가치 추구 정도가 높은 사람들은 가격 프리미엄이 존재하는 경우, 환경에 대한 긍정적 메시지 프레이밍일 때(vs. 부정적 메시지 프레이밍), 해당 제품에 대해 더 긍정적인 태도를 나타냈다. 그러나 경제적 가치 추구 정도가낮은 사람들이나, 가격 프리미엄이 없는 상황에서는 환경에 대한 긍정적 메시지 프레이밍이 광고 제품에 미치는 호의적인 결과는 나타나지 않았다. 반면, 환경적 가치가 높은 사람들은 친환경 메시지 프레이밍과 가격 전략에 큰 영향을 받지 않는 것으로 나타났다. Green consumption is an important issue in today. Despite green consumption is receiving theattention of a wide public, sales of green car still represent a small portion of whole market. Thecurrent study suggests parts of solution to this issue by examining the important role of customer value,message framing and price strategy in the compact hybrid car preference. The result of analysis reveals that customers' economic value and ecological value on cars positivelyinfluence the compact hybrid car preference. Conversely, customers’ social value on cars negativelyinfluence the compact hybrid car preference. And we also find that participants with high economic valueseeking tendency prefer the product with positive green message framing to the product with negativegreen message framing only in price premium condition, while participants with low economic valueseeking tendency does not have a preference for the product with positive or negative green messageframing in both price condition(e.g. price premium, non premium). Conversely, participants with highecological value seeking tendency are not influenced by the type of green message framing and pricestrategy. Our results have important implication for models of consumer value on green products,message framing theory, and the price strategy of compact hybrid cars.

도시형 전동차 언더프레임 피로균열성장 해석

전현규(Hyunkyu Jun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

A fatigue crack, initiated at an under-frame of electric multiple unit(EMU), will be propagated if proper maintenance action has not been performed. In this research, we predict the critical crack size and the fatigue crack growth rate of cracked under-frame of EMU by applying linear elastic fracture mechanics. For this purpose, we build a FE model of car-body which has a virtual crack in the center sil to calculate the stress intensity factor. The virtual cracks with various size are modeled at the cross section between center sil and cross beam. The critical crack size and crack growth rate under the normal operating condition are calculated. The critical crack size at the critical point of center sill with given loading condition is calculated as 90.00 ㎜. Fatigue crack growth rate is predicted by measuring the dynamic stress amplitude at the critical point during normal operation in commercial line and performed fatigue crack growth analyses until an initial crack reaches the critical crack. We can calculate that an initial crack size as 30 ㎜ takes 7.6 years(with HAZ material), 4.6 years(with post tempered HAZ material) to reach the critical crack size, respectively.

전기자동차 프레임 소재에 따른 충돌해석에 관한 연구

김도균(Do-Kuen Kim),고동현(Dong-Hyeon Ko),이상찬(Sang-Chan Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12

Reducing the weight of automobiles is a significant global developmental task. Two materials are used to lighten automobiles: aluminum and CFRP frames. Aluminum is a non-ferrous metal, and CFRP is a composite material. They are lighter and harder than other materials. The two materials were used for the collision analysis. Subsequently, the two cases were compared. Three cases were considered for the collision analysis: head-on collision, partial head-on collision, and side collision at a speed of 60 km/h. The three cases were compared and analyzed considering the materials used to understand the difference between aluminum and CFRP and their collision characteristics.