• 제어로봇시스템학회논문지
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• 제9권8호
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• pp.640-646
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• 2003

We presents an edge-based point correlation algorithm for fast and stable visual inspection system. Conventional algorithms based on NGC(normalized gray-level correlation) have to overcome some difficulties in applying automated inspection systems to real factory environment. First of all, NGC algorithms involve highly complex computation and thus require high performance hardware for realtime process. In addition, lighting condition in realistic factory environments is not stable and therefore intensity variation from uncontrolled lights gives many troubles for applying NGC directly as pattern matching algorithm. We propose an algorithm to solve these problems, using thinned and binarized edge data, which are obtained from the original image. A point correlation algorithm with the thinned edges is introduced with image pyramid technique to reduce the computational complexity. Matching edges instead of using original gray-level image pixels overcomes problems in NGC method and pyramid of edges also provides fast and stable processing. All proposed methods are proved by the experiments using real images.

• 한국정밀공학회지
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• 제15권11호
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• pp.189-198
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• 1998

Recently, monitoring of tool life is a matter of common interesting because tool life affects precision, productivity and cost in machining process. Especially flank wear has a direct effect on cutting mechanism, so the various pattern of cutting force is obtained experimentally according to variation of wear condition. By investigating cutting force signal, AR(Autoregressive) modeling and correlation dimension analysis is conducted in turning operation. In this modeling and analysis, we extract features through 6th AR model, correlation integral and normalized correlation integral. After the back-propagation model of the neural network is utilized to monitor tool life according to flank wear. As a result. a very reliable classification of tool life was obtained.

• 한국보육지원학회지
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• 제13권1호
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• pp.167-184
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• 2017

Objective: The gold of this study is to identify the correlation between mothers' rejective parenting attitude and children's humanity and adaptation to educational institutions, as well as to find out whether children's humanity could act as a mediating effect against mothers' rejective parenting attitude in the process of children's adapting to the institutions. Methods: The study was conducted on 259 children aged 4 to 5 and their mothers. The collected data were used to conduct Pearson correlation coefficient, Three-step mediated regression analysis, and the Sobel test using the SPSS 20.0 program. Results: First, children's institutional adaptability had a significant negative correlation only with 'mother's hostility'. Children's humanity had a significant positive correlation with their institutional adaptability. Second, mothers' hostile attitude had a direct or indirect impact on children's institutional adaptability. Conclusion/Implications: The results above suggest that children's good humanity and parents' friendly attitude are important in children's institutional adaptability.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권2호
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• pp.757-770
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• 2020

We propose a hand gesture recognition method that is compatible with a head-up display (HUD) including small processing resource. For fast link adaptation with HUD, it is necessary to rapidly process gesture recognition and send the minimum amount of driver hand gesture data from the wearable device. Therefore, we use a method that recognizes each hand gesture with an inertial measurement unit (IMU) sensor based on revised correlation matching. The method of gesture recognition is executed by calculating the correlation between every axis of the acquired data set. By classifying pre-defined gesture values and actions, the proposed method enables rapid recognition. Furthermore, we evaluate the performance of the algorithm, which can be implanted within wearable bands, requiring a minimal process load. The experimental results evaluated the feasibility and effectiveness of our decomposed correlation matching method. Furthermore, we tested the proposed algorithm to confirm the effectiveness of the system using pre-defined gestures of specific motions with a wearable platform device. The experimental results validated the feasibility and effectiveness of the proposed hand gesture recognition system. Despite being based on a very simple concept, the proposed algorithm showed good performance in recognition accuracy.

• Transactions on Electrical and Electronic Materials
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• 제2권3호
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• pp.24-27
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• 2001

The end point of oxide chemical mechanical polishing (CMP) have determined by polishing time calculated from removal rate and target thickness of oxide. This study is about control of oxide removal amounts on the shallow trench isolation (STI) patterned wafers using removal rate and thickness of blanket (non-patterned) wafers. At first, it was investigated the removal properties of PETEOS blanket wafers, and then it was compared with the removal properties and the planarization (step height) as a function of polishing time of the specific STI patterned wafers. We found that there is a relationship between the oxide removal amounts of blanket and patterned wafers. We analyzed this relationship, and the post CMP thickness of patterned wafers could be controlled by removal rate and removal target thickness of blanket wafers. As the result of correlation analysis, we confirmed that there was the strong correlation between patterned and blanket wafer (correlation factor: 0.7109). So, we could confirm the repeatability as applying for STI CMP process from the obtained linear formula. As the result of repeatability test, the differences of calculated polishing time and actual polishing time was about 3.48 seconds. If this time is converted into the thickness, then it is from 104 $\AA$ to 167 $\AA$. It is possible to be ignored because process margin is about 1800 $\AA$.

• 한국초등과학교육학회지:초등과학교육
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• 제20권1호
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• pp.1-7
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• 2001

The purpose of this study is to examine the learner's variables affecting on scientific thinking and scientific process skills. To study this purpose, through the procedure study, the learner's variables were divided into cognitive variable, ego variable, and affective variable, then the questionaire survey through the reconstruction of standardization instrument was made over 120 elementary school fifth grade student in Seoul, Anyang, and Pajoo. The results of this study were as follows: 1) The learner's variables affecting on scientific thinking were cognitive variable and for female students, also affect affective variable. The subordinated catagories of statistically significant degree of explanation were achievement motivation, cognitive level, and cognitive style and another statistically significant correlation were meta-cognition, self regulated learning, self efficacy, and muliple intelligence. 2) The learner's variables affecting on science process skills were cognitive variable and affective variable. And the subordinated catagories of statistically significant degree of explanation were achievement motivation, and cognitive level. And another statistically significant correlation were meta-cognition, self regulated loaming, self efficacy, multiple intelligence, and attribution.

• 한국식품영양학회지
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• 제14권4호
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• pp.322-328
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• 2001

To assess the quality characteristics of black-goat meat extracts and to develop their quality index, the ingredient ratio, manufacturing process and general composition of black-goat meat extracts were investigated. A partial meat of black-goat had high protein content(20.2∼21.6%) and low lipid content (1.9∼3.3%). The crude protein contents, 3.5∼6.1%, of black-goat meat extracts had a high correlation (r=0.88, p<0.01) with black-goat meat content and the soluble solid content had a high correlation (r=0.87. p<0.01) with the subsidiary material content. Two commercial products had total bacteria of 10$^1$∼10$^2$ cfu/ ml. showing the necessity of pressure sterilization of final process.

• 한국기계가공학회지
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• 제8권3호
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• pp.74-81
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• 2009

At present, industries and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. One of the technologies is known as MQL machining. This paper presents an investigation into MQL machining with the objective of evaluating cylindricity and cooling effect for the turning process of SM45C. To reach this goal, cylindrical-outer-diameter turning experiments are carried out according to cutting conditions with fluid, MQL and dry machining methods. A cutting force, tool-shank temperature and cylindricity of workpiece are measured and analyzed. The correlation between cutting conditions and cylindricity are evaluated according to cooling lubricant environments.

• 한국콘텐츠학회논문지
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• 제11권9호
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• pp.154-165
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• 2011

본 논문은 공간디자이너의 직무특성에 따라 on-line 기반 아이디어 발상 시스템인 웹스토밍의 활용성이 달라질 것으로 보고 실무 디자이너그룹을 대상으로 요소상관표를 이용한 웹스토밍 활용성 테스트를 실시하여 선행연구인 디자인관리자그룹 활용성 평가결과와 비교분석함으로 공간디자인 프로세스 상에서 직무특성에 따른 웹스토밍 활용방안을 종합하여 제안하고자 하였다. 설문 결과를 관찰-해석-적용의 절차에 따라 분석한 결과 공간디자인 프로세스 요소와 웹스토밍 기능요소 간 요소상관표 분석결과 관리자그룹과 실무자 그룹 양쪽에서 가장 높은 상관성을 나타낸 공간디자인 프로세스는 '계획설계' 단계로 확인되었고 분업화 시점으로 상관성이 저조해지는 것도 동일하게 나타났다. 실무자그룹이 관리자그룹과 확연한 차이를 나타낸 프로세스 부분은 '평가' 단계로 실무자 그룹의 경우 두 번째로 높은 상관성을 나타내었다. 프로젝트 운영과 관련된 부분도 실무자 그룹의 상관성이 높은 것으로 분석되었다. 이에 각 단계에서 웹스토밍에 새롭게 적용할 수 있는 개선안을 도출하고 종합하여 웹스토밍 활용방안을 제시하였다.

• 한국안전학회지
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• 제31권2호
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• pp.119-126
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• 2016

Across the world, the industrialization has increased the frequency of climate anomaly. The size of damage due to recent natural disasters is growing large and fast, and the human damage and economic loss due to disasters are consistently increasing. Urbanization has a structure vulnerable to natural disasters. Therefore, in order to reduce damage from natural disasters, both hardware and software approaches should be utilized. Currently, however, the development of a statistical access process for 'analysis of disaster occurrence factor' and 'prediction of damage costs' for disaster prevention and overall disaster management is inadequate. In case of local governments, overall disaster management system is not established, or even if it is established, unscientific classification system and management lead to low utility of natural statistics of disaster year book. Therefore, in order to minimize disaster damage and for rational disaster management, the disaster damage survey process should be improved. This study selected gale as the focused analysis target among natural disasters recorded in disaster year book such as storm, torrential rain, gale, high seas, and heavy snow, and analyzed disaster survey process. Based on disaster year book, the gale damage size was analyzed and the issues occurring from the correlation of gale and damage amount were examined, so as to suggest an improvement plan for reliable natural disaster information collection and systematic natural disaster damage survey.