• 한국항공운항학회지
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• 제16권4호
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• pp.54-62
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• 2008

International organizations related to air transport such as ICAO, IATA, ACI are forecasting that the number of passenger will grow about 4.4% annually up to 2015. Therefore, the innovation of given system technology and operation procedure is required in global scale to cope with the increase of air traffic demand. CNS/ATM infrastructure based on satellite is considered to play key role in order to solve the problems due to the dramatic increase of air traffic demand over the world. Free flight concept in the air transport operation has been proved with CNS/ATM infrastructure especially in USA and Europe. Therefore, it is necessary to develop key technologies to overcome technology gap and to secure international competitiveness in Korea. ADS-B is an important issue, and new element technologies should be considered as essential items which were shown in Capstone project. Nowadays, the free flight concept is combined to Air Transport Road Map such as NextGen project in USA, SESAR in Europe. In this process, free flight is included in the concepts such as ATM(Air Traffic Management), aviation security and safety, environmental protection and economy development, wide area weather variable reduction service, information integration and application between the related authorities (civil/military) etc. The purpose of research is to establish mid-term and long-term infrastructure plan and strategy for free flight realization in Korea. The analysis of action target and equipment construction status, phase construction plan of infrastructure has been performed by considering mid-term and long-term free flight plans of USA and Europe.

• 한국자동차공학회논문집
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• 제25권1호
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• pp.92-102
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• 2017

For an automotive surveillance radar system, fast-chirp train based FMCW (Frequency Modulated Continuous Wave) radar is a very effective method, because clutter and moving targets are easily separated in a 2D range-velocity map. However, pedestrians with low echo signals may be masked by strong clutter in actual field. To address this problem, we proposed in the previous work a clutter cancellation and moving target indication algorithm using the coherent phase method. In the present paper, we initially composed the test set-up using a 24 GHz FMCW transceiver and a real-time data logging board in order to verify this algorithm. Next, we created two indoor test environments consisting of moving human and stationary targets. It was found that pedestrians and strong clutter could be effectively separated when the proposed method is used. We also designed and implemented these algorithms in FPGA (Field Programmable Gate Array) in order to analyze the hardware and time complexities. The results demonstrated that the complexity overhead was nearly zero compared to when the typical method was used.

• 한국측량학회지
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• 제23권3호
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• pp.313-322
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• 2005

급속한 기술의 발전과 인간 생활 및 문화 활동의 범위가 변하고 확장됨에 따라 지표면에 빠른 변화가 발생하고 있으므로 지도와 지형공간 데이터베이스의 갱신주기는 짧아져야 한다. 이를 만족시키기 위하여 최근에 지형공간정보 분야에서는 지도제작 과정의 자동화와 데이터 처리속도의 단축을 위한 연구가 진행되고 있으며, 이 결과 수치사진측량 워크스테이션, GPS/INS 기술, 위성영상의 활용기술, 자동 정보추출 및 LiDAR 시스템이 개발되었다. 항공 LiDAR 데이터로부터 자동으로 건물을 추출하고 등고선을 생성할 수 있는 가능성에 많은 관심이 집중되고 있다. 그러나 숙련된 작업자에 의해 수동으로 건물을 도화하는 기존의 사진측량 방법에 의한 결과와 비교하면, 정확도와 효율성에 대한 좀더 심도 깊은 연구가 수행되어야 한다. 반면에, LiDAR 데이터로부터 등고선을 생성한 결과, 품질 및 정회성에 있어서 효율적이고 경제적이었다. 본 연구에서는 수치지도 제작에 필요한 건물을 추출하고 등고선을 생성하기 위하여 LiDAR 데이터의 전처리 과정과 단계별 처리과정에 관련되는 다양한 조건의 영향 및 정확도에 관하여 평가하였다.

• 정보과학회 논문지
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• 제44권8호
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• pp.832-841
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• 2017

버그리포트는 소프트웨어의 유지보수 단계에서 발생한 결함 정보를 담고 있는 문서로서 개발자가 해당 결함을 수정하기 위해 필수적인 정보이다. 이 때 개발자가 버그리포트를 해결하기 위해 결함을 추적하는 시간을 단축시키기 위한 정보검색기반 결함위치식별 기술들이 제안되었다. 그러나 정보검색에 유용하지 못한 내용들로 작성된 낮은 품질의 버그리포트가 등록 될 경우 결함위치식별 성능이 크게 저하된다. 본 논문에서는 낮은 품질의 버그리포트를 선별하기 위한 품질 예측 방법을 제안한다. 이 과정에서 버그리포트의 쿼리로써의 품질 요소를 정의하고, 기계학습을 사용하여 품질을 예측한다. 제안 방법을 오픈 소스 프로젝트에 적용하여 기존 품질 예측 기술 대비 평균 6.62% 더 정확하게 예측하였다. 또한 기존 결함위치식별 기술에 제안 예측 기술과 자동 쿼리 재구성 기술을 함께 적용한 경우 결함위치식별 정확도를 1.3% 향상시켜, 제안 품질 예측 기술이 정보검색기반 결함위치식별 기술의 성능 향상을 도울 수 있음을 확인하였다.

• Journal of Microbiology and Biotechnology
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• 제25권2호
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• pp.288-295
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• 2015

Salmonella enterica serovar Enteritidis is the predominant agent causing salmonellosis in chickens and other domestic animals. In an attempt to identify antigenic S. Enteritidis outer membrane proteins (OMPs) that may be useful for subunit vaccine development, we established a proteomic map and database of antigenic S. Enteritidis OMPs. In total, 351 and 301 spots respectively from S. Enteritidis strain 270 and strain 350 were detected by two-dimensional gel electrophoresis. Fifty-one antigen-reactive spots were detected by antisera on two-dimensional immunoblots and identified as 12 specific proteins by matrix-assisted laser desorption ionization time-of-flight mass spectrometry. OmpA and DNA starvation/stationary phase protection protein (Dps) were the most abundant proteins among the identified OMPs, comprising 22 and 12 protein species, respectively. Interestingly, we found that the Dps of S. Enteritidis is also antigenic. OmpW was also verified to have high antigenicity. These results show that OmpA, Dps, and possibly OmpW are antigenic proteins. This study provides new insights into our understanding of the immunogenic characteristics of S. Enteritidis OMPs.

• Journal of Construction Engineering and Project Management
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• 제2권1호
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• pp.14-19
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• 2012

Maturity models allow organizations to assess and compare their own practices against best practices or those employed by competitors, with the intention to map out a structured path to improvement. This research explores the aspects of the Maturity Models that are relevant to distinguish them from one to another. The different Project Management maturity models for define maturity differently and measure different things to determine maturity. Because of this, organizations should give careful consideration to select appropriate maturity model. The main reason behind this research lies on the modification to the existing Organizational Project Management Maturity Model (OPM3) by adding four knowledge areas, dedicated to construction industry as best practices. These are Safety, Environment, Financial and Claim Management. This Model contains (Yes/No) questions; all of these questions must be answered before the user reviews the results that describe the overall maturity and areas of strength and weakness of an organization. The research presents the implementation of the proposed Model Construction Enterprises Maturity Model (CEM2). All the components of the developed Model have been implemented in Microsoft Access. CEM2 helps Construction Enterprises to assess their Maturity Level and know Areas of Weaknesses for future improvement. The easy to use Yes/No user interfaces help enterprises' employees to assess the maturity level of their enterprises. The Model maintains users' responses in its database; as such, many employees from different enterprise divisions can be involved during assessment phase in several sessions.

• International Journal of Concrete Structures and Materials
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• 제7권2호
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• pp.95-110
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• 2013

We report various synchrotron radiation laboratory based techniques used to characterize cement based materials in nanometer scale. High resolution X-ray transmission imaging combined with a rotational axis allows for rendering of samples in three dimensions revealing volumetric details. Scanning transmission X-ray microscope combines high spatial resolution imaging with high spectral resolution of the incident beam to reveal X-ray absorption near edge structure variations in the material nanostructure. Microdiffraction scans the surface of a sample to map its high order reflection or crystallographic variations with a micron-sized incident beam. High pressure X-ray diffraction measures compressibility of pure phase materials. Unique results of studies using the above tools are discussed-a study of pores, connectivity, and morphology of a 2,000 year old concrete using nanotomography; detection of localized and varying silicate chain depolymerization in Al-substituted tobermorite, and quantification of monosulfate distribution in tricalcium aluminate hydration using scanning transmission X-ray microscopy; detection and mapping of hydration products in high volume fly ash paste using microdiffraction; and determination of mechanical properties of various AFm phases using high pressure X-ray diffraction.

• 천문학회보
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• 제37권1호
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• pp.73.2-73.2
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• 2012

The far ultraviolet (FUV) wavelength (900-1750A) range includes a wealth of important astrophysical information related to the cooling of hot gas, fluorescent emission from H2 molecules, and starlight scattered off dust particles. Among these, we would like to focus on the scattered emission of the central star by dust with the example of the FUV halo surrounding ${\alpha}$ Vir (Spica). While scattering properties of dust have been studied with the GALEX data, the improved dataset of STSAT-1 revealed many detailed structures of this interesting region. For example, the FUV continuum map obtained from the STSAT-1 observations shows enhanced emission in the southern part of the Spica halo region, where the dust level is also high. In fact, the FUV continuum intensity is seen to have a good correlation with the IRAS 100${\mu}m$ emission data. It is also seen that the scattered spectrum is softer than the original one emitted by the central star, which is attributed to the increase in the dust-scattering albedo with wavelength. We have developed a Monte Carlo code that simulates dust scattering of light including multiple encounters. The code is applied to the present Spica halo region to obtain the scattering properties such as the albedo and the phase function asymmetry factor.

• 비파괴검사학회지
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• 제28권2호
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• pp.137-143
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• 2008

안경용 구면 렌즈는 굴절력에 따라 (+)디옵터와 (-)디옵터 렌즈로 구분할 수 있다. 렌즈에 가해지는 외부 열원에 의해서 생기는 열변형은 디옵터의 종류에 따라 다르게 나타난다. 본 논문에서는 빛의 가간섭성을 이용하여 물체의 변형을 비접촉으로 정확하게 측정할 수 있는 전자처리 스페클법을 이용하여 렌즈에 발생되는 열변형을 정량적으로 측정하였다. 외부 열원에 의한 온도 분포의 측정은 실시간 비접촉으로 온도를 측정할 수 있는 적외선 열화상 카메라를 사용하였다. 실험은 총 14종의 플라스틱 상용 안경 렌즈를 대상으로 수행하였다. 동일한 온도차에서 (+)디옵터 렌즈의 경우에는 디옵터의 증가에 따라서 열변형량이 증가하였다. 반면에 (-)디옵터 렌즈는 디옵터의 증가와 관계없이 열변형량이 거의 선형적이었다. 또한 동일한 디옵터에서 (+)디옵터 렌즈의 열변형량이 (-)디옵터 렌즈의 열변형량 보다 작았다. 따라서 본 논문에서는 렌즈에 열이 가해지는 경우 렌즈의 열변형량을 정량적으로 측정할 수 있음을 확인하였다.

• 한국조경학회지
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• 제31권4호
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• pp.25-38
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• 2003

The main problems of disordered and congested urban landscape are due to the lack of holistic management that can control various elements of forming a city. Especially, the color of urban landscape is problematic because it is related to individual and social characteristics as well as to physical characteristics. Therefore, temporary expedients that can solve only visualized problems can not be a proper solution for color problems of urban landscape. This study originated from the question about why the color of disordered and congested urban landscape has not been improved. This study aims at directly improving the urban environmental color by finding out what the actual problems related to color are, and what the solutions would be. The goal of this study is to find a holistic systematic problem-solving method. Problems of urban environmental color are identified from both literature review and questionnaires to the expert group, such as environmental planning, design group, and the landscape executive group. Through mapping of relationships among these problems, the intellectual map was made to layout the structures of problems. Based on this method, the structures of problems of urban environmental color were classified into 5 categories: 1) the items related to the administrative structure, 2) the items related to the color management goal and system, 3) the items related to the color planning and design phase, 4) the items related to the color consulting committee, and 5) the items related to the present state of color use. Thus, in order to solve the color problem in urban landscape, practical strategy is strongly required. It is not a temporary expedient but a holistic approach. The solution for the problems of urban environmental color could be divided into 6 types; ‘regulations amendment’,‘color standard amendment’,‘color management plan’,‘color education’, and ‘advertisement for the goal of color management’. Regulations amendment among these types was proposed as the most effective method due to the close relationship with problem categories. Thus, as the solution for the problems of urban environmental color, the ‘color management system’ was suggested. Detailed contents the suggested color management system were divided into three parts; 1) legislation by regulations, ordinance and acts, 2) management by controling the level of guidelines, and 3) the standards for execution of this system.