• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.282-285
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• 2017

본 논문에서는 무인비행기를 활용하여 재철소에서 사용하고 있는 대량의 원재료인 고철의 체적을 산정하고 수량을 파악하여 기존의 재고량산정 방법의 문제를 개선하고 보다 효율적이며 객관적인 고철량을 파악하는 방법을 찾는데 목적이 있다. 고철량 산정에 있어 무게를 산정하기 위해서는 체적을 산정하여 비중값을 적용하여 산정한다. 본 연구에서는 무인비행기(UAV)를 이용하여 체적을 산정하고 정확성 검증을 위해 정형의 컨테이너 박스와 크기가 작은 휴지통을 촬영 분석하여 비교 검증한 후 고철의 체적 측정 시험을 시행하였다. 무인비행기는 고정익 드론을 사용하였으며 격자비행방식을 적용하여 촬영하였으며, 촬영 전 지상기준점을 구하고자하는 물제의 주변에 배치하고 측량하여 적용하였다. 분석결과 체적산정을 위한 검증시험에서는 측량한 치수 및 체적 값과 무인비행기분석 값이 유사하게 나타났다. 또한 제철소에서 검증한 고철의 무게와 체적을 기준으로 무인비행기를 이용한 체적 값을 비교한 결과 기존 방식에 비해 객관적이고 효율적인 값을 얻을 수 있는 것으로 판단된다.

• IE interfaces
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• v.20 no.2
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• pp.121-132
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• 2007

The facility layout problem (FLP) involves the positioning of facilities within a given workplace in order to minimize the material flow distance between facilities. In this paper, we focus on the FLP in which the each facility has a rectangular shape and an input and output points. We develop a heuristic algorithm in which the facilities are arranged according to the layout algorithm using center of gravity and then simulated annealing algorithm is applied to improve the solution. A comparison of the computational results with exiting algorithms shows that the proposed algorithm provides better solutions in reasonable range of computational time.

• Broadcasting and Media Magazine
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• v.26 no.4
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• pp.11-22
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• 2021

실감형 미디어를 구성하기 위해서는 다시점 영상 또는 비디오들로 구성된 대용량의 콘텐츠가 필수적이다. 이러한 콘텐츠는 다량의 카메라들을 목적에 따라 배치하여 획득하므로 영상 구성의 복잡성과 콘텐츠의 크기가 급격히 커진다는 문제점을 갖고 있다. 3D 미디어 환경에서 카메라의 개수를 최소화하면서도 목적에 맞게 다양한 시점을 제공할 수 있는 가상시점 영상 생성은 핵심적인 기술이다. 본 기고문에서는 다시점 영상과 비디오로부터 학습 기반의 가상 시점 영상 생성 연구들에 대해 체계적인 조사를 통해 그 결과를 다음과 같이 제시한다. 첫째, 가상 시점 영상 생성에 대한 배경 개념을 정의한다. 둘째, 제안하는 분류 방식에 따라 기존의 제안된 방법들을 상세하게 분석한다. 셋째, 가상 시점 영상 생성에 주로 사용되는 관련 데이터셋을 조사한다. 마지막으로는 각 연구들이 갖고 있는 특징들을 분석하고, 정량적, 정성적 평가 결과를 비교한다.

• The Korean Journal of Air & Space Law and Policy
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• v.32 no.2
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• pp.247-276
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• 2017

The protection of space asset has been new major cause of space militarization. For such purpose, it has been officially announced that a policy of deterring and denying any adversaries from accessing the outer space. Space militarization is to be conversed into a new concept of space weaponization. The USA has announced its policy of space weaponization, while China and Russia have not revealed their plan or policy. Latter States, however, have proposed a draft treaty limiting the deployment of warfare in the outer space. The terms of the Outer Space Treaty, reflecting three significant United Nations General Assembly resolutions from the 1960s, support the position that ground rules must be observed in the exploration and the use of outer space, particularly in the absence of specific space law rules. Yet the combination (and culmination) of these two approaches to the legal regulation of outer space-specific rules as and when agreed by the international community and the translation of principles developed for terrestrial regulation to outer space-still leaves much room for uncertainty and exploitation for military and strategic purposes. As space weaponization may contribute to deterring the use of weapon, it may be not against the UN Charter Article 2(4). If space weaponization might generate the space debris such that the outer space is no more available for exploration and use, it is against the proportionality principle and discrimination principle enshrined in the laws of the war. But, if the limitation upon the kind and use of space weaponization is agreed among the States, then the space weaponization may not be against the laws of the war, and be considered permissible within the rationale of limited war.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.14 no.1
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• pp.151-160
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• 1994

Recently, terrestrial photogrammetry has been applied effectively to data acquisition in GIS and to monitoring precise machinery for simulation test. Because 3-D coordinates of many object points can be quickly measured with constant accuracy and easy modeling by this method. In this study, the composition concerned with multi-camera system which simultaneously analyzes structure from multi-station using various cameras was developed. The errors of results were analyzed to investigate the accuracy of the system, error of unknown points and control points, convergent and strip adjustment for optimal network design also. As results of this study, the efficiency of multi-camera system developed here was proved through application to monitoring the entire area of the precise model ship. We could also acquire 3-dimensional coordinates with good accuracy by arranging pass points. Therefore, possibility of measurement of instantaneous deformation as well as precision analysis of structures can be suggested.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.11 no.1
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• pp.7-18
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• 1993

In analyzing whole surface of non-topographic objects, the design of multi-station photogrammetric network must involve a number of questions such as geometric configuration of exposure stations, imaging geometry, control point configuration or weight allowance of adjustments. Above all, the surveying of the interior of narrow longitudinal structures needs the design of special photogrammetric network. The main objective of this paper is to suggest the schemes for solving difficult problems attendant upon whole inside-surface analysis of structure and to improve the accuracy and reliability of final measurements. For it, the multi-station exposure network suitable to shape and size of the inside of the structure was designed. Then three dimensional data were acquired by bundle adjustments derived from multi-station photos and the effects of network design factors on accuracy of measurements were contemplated. Also, the algorithm for detection of blunders was developed here is expected to lead to improvement of the reliability of photogrammetric solutions.

• Journal of Korea Multimedia Society
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• v.3 no.1
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• pp.23-33
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• 2000

In this paper, we describe an algorithm which can extract human faces with natural pose from complex backgrounds. This method basically adopts the concept that facial region has the nearly same gray level for all pixels within appropriately scaled blocks. Based on the idea, we develop a hierarchial process that first, a block image data with pyramid structure of input image is generated, and some candidate regions for facial regions in the block image are Quickly determined, then finally the detailed facial features; organs are decided. To find the features easily, we introduce a local gray level transform which emphasizes dark and small regions, and estimate the geometrical triangle constraints among the facial features. The merit of our method is that we can be freed from the parameter assignment problem since the algorithm utilize a simple brightness computation, consequently robust systems not being depended on specific parameter values can be easily constructed.

• The Journal of the Acoustical Society of Korea
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• v.21 no.3
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• pp.245-255
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• 2002

This thesis deals a method to deliver more realistic sound by cancelling the cross-talk which is inherent to the 5.1 channel speaker system. The acoustical model for cross-talk cancellation is the free field model. This model minimizes distortion of sound. I used the bark scale sound quality compensation which based on psycho-acoustic. For the surround channels, band-limited sound quality compensation is performed in the frequency domain. I also performed the sound quality assessment test on the traditional 2 channel stereo and 5.1 channel system. This test is performed in the test chamber which satisfies the ITU-R specifications. I uses the IACC (Inter-Aural Cross-Correlation) to determine the preferences of the amateur and the golden ear experts to asses the trans-aural filter. According to the result from the proposed method, I got more the 38 dB separation rates with the Dolby standard speaker array. The results on the diffusion by the subjective test with the experts shows 0.4 point increased then before.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.2
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• pp.99-108
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• 2004

This thesis deals a method to deliver more realistic sound by cancelling the cross-talk which is inherent to the 5.1 channel speaker system. The acoustical model for cross-talk cancellation is the free field model. This model minimizes distortion of sound. I used the bark scale sound quality compensation which based on psycho-acoustic. For the surround channels, band-limited sound quality compensation is performed in the frequency domain. I also performed the sound quality assessment test on the traditional 2 channel stereo and 5.1 channel system. This test is performed in the test chamber which satisfies the ITU-R specifications. I uses the IACC(Inter-Aural Cross-Correlation) to determine the preferences of the amateur and the golden ear experts to asses the trans-aural filter. According to the result from the proposed method, I got more the 38㏈ separation rates with the Dolby standard speaker array. The results on the diffusion by the subjective test with the experts shows 0.4 point increased then before.

• The Journal of Sustainable Design and Educational Environment Research
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• v.14 no.1
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• pp.10-21
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• 2015

Due to the impact of birth rate, the school age population decreases year by year, and as a result, the Ministry of Education conducts the layout adjustment for middle and primary schools and cancels substantial rural schools. Nearly half of the cancelled and idle schools are not applied till now. Combining the practical demand of local residents, it is quite necessary to make use of the idle schools effectively again. Consequently, field investigation is conducted for the architectural status of 28 idle schools in Pingle County of Guilin, Guangxi, and detail investigation and analysis has been carried out for the different scales of schools from various aspects, including the covered area, traffic, building construction, space composition, degree of aging, etc. The investigation result shows that small teaching schools are remote, being small in scale, single in space and serious in aging. Complete primary schools are close to the villages and towns, being large in scale, abundant in space, and well preserved. The teaching schools are between the previous two types. Meanwhile, it is generally convenient in traffic, and good in structure. It can provide fundamental data for the future utilization and study.