• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.88.2-88.2
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• 2017

한국우주전파관측망(KVN: Korean VLBI Network)은 서울, 울산, 제주에 직경 21m 전파망원경 3기로 이루어진 우리나라 최초의 초장기선 전파간섭계(VLBI: Very Long Baseline Interferometry)이다. KVN은 밀리미터 파장의 22, 43, 86, 129 GHz 대역을 동시에 관측할 수 있는 수신시스템을 이용하여 독보적인 다파장 관측연구를 진행해오고 있으며, 뛰어난 위상보정 성능을 바탕으로 기존의 밀리미터 대역에서 검출되지 않았던 많은 천체들을 검출하고 있다. 하지만, KVN 3기 VLBI 관측으로부터 얻어지는 천체의 합성영상(synthesized image)은 초미세구조에서 발생하는 물리 기작을 연구하기에는 큰 한계를 지닌다. KVN을 활용한 연구 성과를 극대화하기 위한 최적의 방안을 도출하기 위하여, KVN 확장 기획연구를 진행하고 있다. 본 연구는 KVN 확장시 예상되는 성능을 분석하고, 영상 성능을 극대화하기 위한 최적의 사이트 조건을 알아본다.

• Proceedings of the KOR-KST Conference
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• 1999.10a
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• pp.347-351
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• 1999

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 1994.10a
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• pp.39-42
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• 1994

• Korean Institute of Interior Design Journal
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• v.19 no.6
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• pp.179-187
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• 2010

For the user-centered interior space design, a designer needs to carefully focus on the details from which the user must keenly observe or concentrate on the space and how to deliberately check the image of the space. Following this view, for the user-centered interior space design this study analyzes the way which the space is represented from the perspective of the image assessment. The results obtained from this study are summarized as follows: First, this study analyzed the characteristic of space image change in the form of cross-comparison between one space and a rotated space. With analyzing of an eye fixation by showing the space, the space images of "concentration-dispersion" and "strengthening-weaken "have an important role in the analysis of the perception of space. it confirmed that the method of space perception was changed by rotated the space. Second, With changing quantities of image and extraction of deviation from adjective in survey, it quantitatively graps that respondents of feel in space perception by changing the space and "concentration" and 'dispersion" for process of space choice. The results of the research can provide important basis to judge the changing of space perception by visual perception. Third, through the analysis of image change rate and deviation rate, the characteristics of image change with space change can be analyzed. The results derived from the study provide the evidence to support the image change by space rotating.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.1
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• pp.36-41
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• 2011

Configuration space(C-space) including configuration obstacle(C-obstacle) is one of the most important concepts in mobile robot path planning. Using C-space and C-obstacles, the robot with different shapes and moving mechanisms can be considered as a point in the C-space. And, as a result, the collision-free path for the robot can be easily achieved. To make C-space including C-obstacle, many researchers used circular approximation method for the efficient caluculation time. This method can help us to save our time by approximating the shape of a robot as the minimum sized circle which can cover all the area of robot. But, by using the circle larger than the robot, more space are considered as the part of robot and, as a result, some obstacles which are very near each other may be considered as a combined one obstacle. To solve this problem, multi-level configuration space is proposed by this paper. This multi-level method also use the circular approximation method as the initial step. But, after finding the initial path, it will check how many obstacles are combined. And then, for each combined obstacle, more accurate C-space generation will be continued. To check the efficiency of the proposed algorithm, time for c-space generation are compared with the well-known accurate C-space generation method using various types of robot shape.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.6
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• pp.16-22
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• 2003

The purpose of this study was to provide visual evaluation data in a workstation space when different lighting types were applied. For the performance evaluation, Radiance program was used for simulations, and the mock-up room(15.0x11.6x3m) was used for the actual test. The results of this study were as follows; 1) When the inidirect lighting simulation data using Radiance was compared with the actual data in a small workstation space, there was a 6.5% difference. Therefore, Radiance program was proved to be useful for the evaluation of lighting performance. 2) Higher light levels (higher light ratio (%)) were recorded in the straddled layout and lower light levels (lower light ratio (%)) were recorded in the centered layout condition in most cases. 3) Also, the results show that the indirect luminaires and the straddled layouts provide higher uniformity, whereas the direct luminaires and the centered layouts have lower uniformity.

• Journal of the Korea Society of Computer and Information
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• v.14 no.3
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• pp.139-147
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• 2009

The memory based reasoning just stores in the memory in the form of the training pattern of the representative pattern. And it classifies through the distance calculation with the test pattern. Because it uses the techniques which stores the training pattern whole in the memory or in which it replaces training patterns with the representative pattern. Due to this, the memory in which it is a lot for the other machine learning techniques is required. And as the moreover stored training pattern increases, the time required for a classification is very much required. In this paper, We propose the EAS(Evaluation And Selection) algorithm in order to minimize memory usage and to improve classification performance. After partitioning the training space, this evaluates each partitioned space as MDL and PM method. The partitioned space in which the evaluation result is most excellent makes into the representative pattern. Remainder partitioned spaces again partitions and repeat the evaluation. We verify the performance of Proposed algorithm using benchmark data sets from UCI Machine Learning Repository.

• Korean Institute of Interior Design Journal
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• v.25 no.6
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• pp.40-51
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• 2016

The aim of this study is to quantitatively deduce the circulation efficiency and space arrangements of the outpatient department in geriatric hospitals in terms of spatial structure and to find a methodology that could promote the improvement of accessibility and spatial cognition while using the facilities. All space units of the selected twelve geriatric hospitals were located on the first floor. The study adopted the psychological distance concept of space syntax to the unitized spaces, and presented a set of indices, such as TD, PN, RF, PNT and TRF. These indices were calculated according to the standard clinical use procedures. The study evaluated the effectiveness of circulation. The analysis of circulation was based on the four major geriatric illnesses that were selected in this study. The study established the standard clinical use procedure with consideration of the medical treatment, examinations and space units of outpatient departments. The results are as follows: 1) Based on the statistical data, four major geriatric illnesses are examined, and space requirement and standard procedures are established. Development indicators are applied in order to quantitatively deduce the efficiency of spatial cognition. 2) The percentage of the risk of cognitive decline(TRF) has an inversely proportional correlation to the circulation efficiency(PNT) at a certain point. TRF is more influenced by the clinical use procedure than the scale. 3) The arrangement of the waiting space and types of corridor greatly affect the percentage of the risk of cognitive decline. 4) Vulnerable facilities are selected on the basis of the evaluation, and two alternatives that could promote the circulation efficiency are presented. The result of the reanalysis showed that cognitive efficiency had much improved compared to the existing facilities.

• Journal of Intelligence and Information Systems
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• v.14 no.4
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• pp.47-68
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• 2008

The aim of this research is to develop a new business model using mobile RFID in exhibition spaces such as museums and art galleries. Using mobile RFID, the exhibition space is expected to be evolved from a simple media space only for the exhibition to an extended space integrating media, commerce and entertainment. This paper proposes a u-Exhibition business model and its scenario in the u-Exhibition space. We discuss the real-world issues for the implementation and show the ways of investigating working conditions for the business model through revenue simulation and analyzing the expected value of tag installed on the exhibition space by so-called 'tag evaluation model.'

• KIEAE Journal
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• v.12 no.1
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• pp.3-10
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• 2012

Recently, the increase of impervious area has been pointed out as a major cause of climate change and biotop area deterioration]. Therefore, quantitative indicators for environmental housing design and planning have been needed especially to control the impervious area. The Biotop Area Ratio(BAR) as the mostly applied environmental planning control instrument in Korea verifying the possibility of utilizing has been used effectively in various aspects. However, the fact that the space types are based on two dimension and ecological functions of spaces are simplified has shown the limitations of this planning instrument in the use as planning and evaluation indicator. In this study, classification criteria and the weighting of the space types in similar indicators Biotopflaechenfaktor (BFF, Berlin), Seattle Green Factor (SGF, Seattle), and Green Area Factor (GAF, Malmo) were analyzed. These indicators are similar in the sense that they apply weights to calculate the area and express a percentage of land area. The findings are as follows: The basic method that can estimate the vegetation volume is proposed to overcome the limitation of the BAR. It also was proven that the introduction of three-dimensional volume rate of biotops area was possible. Finally, the framework of space type classification criteria is proposed through linkages with relevant laws and regulations. With the improvement of the space types, the BAR is expected to be reasonable indicator in outdoor space evaluation in housing project.