• The Journal of the Korea Contents Association
• /
• v.6 no.12
• /
• pp.21-28
• /
• 2006

In a face detection system based on template matching, histogram equalization or log transform is applied to an input image for the intensity normalization and the image improvement. It is known that they are noneffective in improving an image with intensity distortion by illumination variation. In this paper, we propose an efficient image improvement method using a simple regression analysis combined with a bilateral symmetry average for images with intensity distortion by illumination variation. Experimental results show that our method delivers the detection performance better than previous methods and also remarkably reduces the number of face candidates.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.5 no.2
• /
• pp.136-148
• /
• 1997

The present study has been carried out to develop a computational procedure for the analysis of the off-design performance in centrifugal compressors with vaneless diffusers by integrating empirical loss models and analytical equations. Losses in centrifugal compressors stem from a number of sources and their exact calculation is not yet possible. This study investigates several modeling schemes and shows that a fairly good prediction can be achieved by a proper selection of the most important flow parameters resulting form a meanline one-dimensional analysis. The performance maps for compressors are calculated and compared with measured performance maps. The off-design performance characteristics in terms of the pressure ratio vs. mass flow produced have generally correct forms. However, no universal means have been found to predict accurately the onset of surge. The prediction method developed through this study can serve as a tool to ensure good matching between parts and it can assist the understanding of the operational characteristics of general purpose centrifugal compressors.

• Journal of the Korea Fashion and Costume Design Association
• /
• v.11 no.1
• /
• pp.123-132
• /
• 2009

Our government has declared the "Synthetic Project for Promoting Han-style" to industrialize and globalize the original form of Korea traditional culture. Han-bok, our traditional folk costume is one of the main subject of this project. However it is the global trend not to wear their traditional folk costume. And so, the number of people wearing Han-bok, our traditional folk costume is also getting gradually decreased in Korea. For Han-style Promoting Project in the future, it is one of the most efficient way for the middle and high school students to motivate and increase the interest about Han-style and Han-bok as the middle and high school uniforms. Adolescent middle and high school students think very important their appearance. Especially, Korean middle and high school students spend a lot of time in school, and so school uniforms are very influential in their mental and physical aspects. Fabrics for this study, they were woven twill with 3 kinds of fabric patterns from the motif of Baekje relics. The colors of fabrics is the blue and brown used in general school uniform, the yellow and red used in Han-bok. Considering the school uniforms, fabric patterns adapted the similar color matching method for not to be found cleary and designed the fabric pattern's one-repeat size is $4{\times}4cm$.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2011.04a
• /
• pp.443-444
• /
• 2011

This paper discusses a model order reduction for large order rotor dynamics systems results from the finite element discretization. Typical rotor systems consist of a rotor, built-on parts, and a support system, and require prudent consideration in their dynamic analysis models because they include unsymmetric stiffness, localized nonproportional damping and frequency dependent gyroscopic effects. When the finite element model has a very large number of degrees of freedom because of complex geometry, repeated dynamic analyses to investigate the critical speeds, stability, and unbalanced response are computationally very expensive to finish within a practical design cycle. In this paper, the Krylov-based model order reduction via moment matching significantly speeds up the dynamic analyses necessary to check eigenvalues and critical speeds of a Nelson-Vaugh rotor system. With this approach the dynamic simulation is efficiently repeated via a reduced system by changing a running rotational speed because it can be preserved as a parameter in the process of model reduction. The Campbell diagram by the reduced system shows very good agreement with that of the original system. A 3-D finite element model of the Nelson-Vaugh rotor system is taken as a numerical example to demonstrate the advantages of this model reduction for rotor dynamic simulation.

• Journal of the Korean Society of Food Culture
• /
• v.32 no.5
• /
• pp.412-420
• /
• 2017

This study present base data for development of vinegar-based source and marketing strategies for penetration of the global market for local source companies by comparing and analyzing the awareness and choice factors of vinegar-based sauces by foreign consumers. Preference (p<0.05), matching food (p<0.001), number of purchases (p<0.001), place of purchase (p<0.001), information source (p<0.001), importance of selective attributes (p<0.05), and most frequently purchased vinegar-based sauces (p<0.01) differed significantly according to nationality. There were also significant differences by nationality in purchase intention (p<0.05), packaging (p<0.001), and purchase considerations (p<0.001) of naturally fermented vinegar-based sauce. Developing of vinegar-based sauces and menus should be combined so that it suitable for the food culture of each country.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.28 no.3
• /
• pp.385-392
• /
• 2010

A LiDAR technique has the merits that survey engineers can get a large number of measurements with high precision quickly. Aerial photos and satellite sensor images are used for generating 3D spatial images which are matched with the map coordinates and elevation data from digital topographic files. Also, those images are used for matching with 3D spatial image contents through perspective view condition composed along to the designated roads until arrival the corresponding location. Recently, 3D aviation image could be generated by various digital data. The advanced geographical methods for guidance of the destination road are experimented under the GIS environments. More information and access designated are guided by the multimedia contents on internet or from the public tour information desk using the simulation images. The height data based on LiDAR is transformed into DEM, and the real time unification of the vector via digital image mapping and raster via extract evaluation are transformed to trace the generated model of 3-dimensional downtown building along to the long distance for 3D tract model generation.

• Korean Medical Education Review
• /
• v.15 no.3
• /
• pp.125-135
• /
• 2013

Since the establishment of the national medical licensing examination board in 1992, the medical licensing examination system has changed enormously and this has had a number of impacts on examination services. All those reforms were aimed at improving the relevance and reliability of the test. Several attempts of the testing system have appeared in the new examination service, and which have also brought about the changes in the medical school curriculum such as introducing integrated courses instead of traditional subjects, using test scores as a reference to the post-graduation selection test. Some examples of changes in the examination system are as follows: 1) choosing three integrated test subjects and outlines of their reference content instead of 15 academic subjects, 2) adjusting the ratio of multiple choice question items to focus more on the problem solving level, 3) introduction of 'one-best answer' single set and 'extended matching type items, 4) item construction based on real clinical cases and real clinical materials. Recently, a clinical skill test system has been introduced to measure examinees' basic clinical skills competencies. Despite continuing efforts, the examination system still has many issues remaining to be solved. These problems include the differential weighting of test items, appropriate threshold for passing, and practicality of pre-testing to stabilize the passing rate and avoid the hazards of newness and undesirably difficult test items.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.15 no.3
• /
• pp.91-98
• /
• 2007

This paper presents the induced mathematical modeling equations for evaluating the operation stability with automatic transmission of heavy duty vehicle. This theoretical approach indicates that linearized governing equations of system can be converted into eigen-value problems. if the eigen-value has positive number, we can predict the engine operating point locates an unstable operating region. To be a stable state, the unstable operating point diverges toward a stable point which is able to maintain uniform velocity. Based on the previous theoretical analysis, we carry out dynamic simulation to show the behavior of engine operating point and torque converter in transient state. As a result of the dynamic simulation, the suggested theoretical method is found to be reasonable for evaluating the operation stability of a torque converter. In addition, the numerical results explain the engine stops and fluctuating phenomenon in reality.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2005.11a
• /
• pp.67-69
• /
• 2005

지문인식 시스템이란 저장되어서 가지고 있는 지문data와 지금 현재sensor로 입력받은 지문data의 유사도를 측정하는 system이다. 현 시대의 보안에 관한 요구가 많아지면서, 개인password나PIN(Personal Identification Number)같이 외워서 사용해야만 하는 불편함이 없고, 본인임을 쉽게 증명할 수 있는 생체정보를 이용한 ID system이 각광을 받고 있다. 이러한 상황 속에서 가장 손쉽게 접할 수 있는Finger-print Identification system을 구현할 것이다. 지문인식 시스템은 sensor의 방식에 따라 여러가지로 분류되는데, 본 논문에서는 광학방식 센서를 이용한 지문인식 시스템을 구현 하였다. 본 지문인식 시스템은 처음 지문영상을 센서로 입력 받고 그 입력된 영상을 전처리(pre-processing)해서 지문의 특징점을 추출한다. 이렇게 특징점들을 획득한 후, 후처리(post-processing)과정을 거쳐서 database에 저장 한다. 이렇게 지문영상의database를 구성한 후, 비교하고자 하는 지문영상을 센서로 입력 받아 지문영상을 획득할 때와 같은 processing과정을 거치고, 그 결과물과 database에 저장되어있는 지문과 1:N matching을 한다. 이렇게 해서 유사한 지문영상을 유사도에 따라 출력한다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2007.04a
• /
• pp.13-17
• /
• 2007

The green roof industry have been developed with Europe, North America, Japan. At the same time, being recognized the important of green roofs in domestic industry and we just start to develop the relative technology as analyzing the future direction of advanced technology. Recently, local self-government including Seoul support the system for green roof which provide 50% of working expenses form of Matching Fund by Seed Money. As years go by, the number of build up the green roof has gradually increased to be proved. At this result caused by management of system in government, unstructured construction system, low development of support technology. In this study as analyzing the present of technical development, supporting by law and system for the advanced waterproofing and root penetration resistance technology, we suggest the development direction of it to be compared with application advanced technology and we could strengthen the international competitiveness to be industrialized the green roof considering system, technology, human infrastructure.