• 대한원격탐사학회지
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• 제4권1호
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• pp.31-40
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• 1988

Low-cost microcomputer systems can be assembled which possess computing power, color display, memory, and storage capacity approximately equal to graphic workstactions. A low-cost, flexible, and user-friendly IBM/PC/XT/AT based image processing system has been developed and named as KMIPS(KAIST (Korea Advanced Institute of Science & Technology) Map and Image Processing Station). It can be easily utilized by the resource managers who are not computer specialists. This system can: * directly access Landsat MSS and TM, SPOT, NOAA AVHRR, MOS-1 satellite imagery and other imagery from different sources via magnetic tape drive connected with IBM/PC; * extract image up to 1024 line by 1024 column and display it up to 480 line by 672 column with 512 colors simultaneously available; * digitize photographs using a frame grabber subsystem(512 by 512 picture elements); * perform a variety of image analyses, GIS and terrain analyses, and display functions; and * generate map and hard copies to the various scales. All raster data input to the microcomputer system is geographically referenced to the topographic map series in any rater cell size selected by the user. This map oriented, georeferenced approach of this system enables user to create a very accurately registered(.+-.1 picture element), multivariable, multitemporal data sets which can be subsequently subsequently subjected to various analyses and display functions.

• 정보보호학회논문지
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• 제29권1호
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• pp.127-137
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• 2019

패스워드, 패턴 락, 지문인식 등의 기존 스마트폰 인증 기술은 사용자의 높은 자각을 요구하며 한번 인증이 되면 재인증 절차 없이 모든 정보에 접근이 허용되는 일시적 인증이다. 이를 보완하기 위해 최근 스마트폰 사용자의 기기 사용 패턴 및 행동을 기반으로 한 행위 기반 인증이 주목받고 있다. 하지만 기존의 연구는 사용자 중심의 연구가 아닌 인증의 정확도를 높이는 연구가 중점적으로 수행되었다. 인증은 사람이 직접 사용하는 것이므로 사용자 인식의 분석이 필요하다. 본 연구는 인증을 강화하고 빈번히 발생하는 인증에 대한 사용 편의성을 향상시키기 위해 행위 기반 인증 기술에 대해 사용자 중심의 연구를 수행한다. 이를 위해 기존의 행위 기반 인증에 대한 연구를 바탕으로 인증 요소를 선별하고 이에 대한 인식 및 행위 기반 인증 기법의 수용에 대한 인식을 분석한다.

• Journal of Forest and Environmental Science
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• 제38권3호
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• pp.195-206
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• 2022

Gaining an understanding of bird communities in different habitat types is essential for the conservation of ecologically important habitats. Wetlands possess different types of habitats and provide an important environment for wintering waterbird communities. This study compares avian communities in five different habitat types in the Moeyungyi Wetland Wildlife Sanctuary (MWWS), Myanmar. From December 2014 to the first week of February in 2015, bird and habitat data were collected from representative areas of five habitat types (i.e., short grassland, tall grassland, lotus fields, open water areas, and rice fields) at MWWS. We established nine sampling plots in each habitat type, and used the point quadrat method to survey habitats and the point count method to survey birds in the habitats. Simple one-way analysis of variance (ANOVA) and post-hoc tests were used to determine differences between bird communities. We made 95 detections during 19 daily visits to each of the five habitat types. During the survey period, we recorded a total of 10,389 individuals belonging to 52 different bird species, based on 7-min observations at each of the 45 point count stations. Furthermore, we detected significant differences by habitat structure (i.e., vegetation coverage, height, and density; water depth; and plant species diversity) as well as bird communities (i.e., species richness, abundance, and diversity indices). In addition, the detailed analysis of 52 avian species revealed significant differences among 45 species with respect to the mean numbers of observed individuals in the survey habitats. The findings of this study revealed significant differences in the structure and composition of waterbird communities among the five assessed habitat types. Because natural marshes provide preferable habitats for a larger number and greater diversity of birds, relative to rice fields, natural marshes should be prioritized for conservation and restoration in Moeyungyi Wetland Wildlife Sanctuary.

• 한국조경학회지
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• 제45권1호
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• pp.35-51
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• 2017

가로정원은 서울시 가로환경 개선 사업의 일환으로, 보행자들에게 심미적 만족과 심리적 안정감을 제공하기 위한 휴식공간으로 설치되었다. 본 연구에서는 실제 가로정원이 이용자의 심리적 향상을 돕는지 고찰하기 위해, 가로정원과 이에 상응하는 비교대상지를 선정하여 설문조사를 실시하고, 결과를 비교하였다. 서울시에 위치한 총 9개의 가로정원 중 강남대로, 디지털로, 테헤란로에 설치된 가로정원을 대상지로 선택하였으며, 비교대상지로는 동일 대로상에 위치하며 물리적 환경이 유사하나 가로정원 사업이 시행되지 않은 3개의 장소를 선정하였다. 설문은 주의회복이론(Attention Restoration Theory: ART)을 근거, '매력감(Fascination), '벗어남(Being away)', '짜임새(Coherence)', '규모(Scope)'를 중심으로 구성된 회복환경지각척도-11(Perceived Restorativeness Scale-11) 질문과, 심리적 회복을 유도한 설계 요소를 묻는 질문으로 구성하였고, 요인분석, 신뢰도 분석, 독립표본 t-검정을 이용하여 분석하였다. 분석 결과, 가로정원은 이용자들의 심리적 회복에 비교적 긍정적 효과를 미치며, 특히 이용자들에게 매력감과 흥미로움을 부여한다고 나타났다. 그러나 가로정원은 이용자들에게 고단한 현실에서 벗어나는 듯한 느낌을 주지 못하여 심리적 향상효과의 한계를 드러냈다. 심리적 회복효과를 유도한 가로정원의 물리적 요소는 나무벤치, 나무, 꽃으로 나타나, 자연적인 요소가 인공적 요소보다 심리적 회복에 긍정적 영향을 준다는 심리회복 이론에 부합하였다. 본 연구의 결과는 향후 가로정원 사업을 추진함에 있어 계획 및 설계 가이드라인 개발에 기여할 것으로 기대된다.

• 한국조경학회지
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• 제26권2호
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• pp.15-27
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• 1998

The purposes of this study were to investigate vegetation structure and present management planning of mountain type green space using the green space changes during the 20 years, actual vegetation, and plant community structure in land area of Inchon, Korea. The actual vegetation area in survey sites was consisted of Quercus acutissima community, Robinia pseudoacacia forest, Pinus rigida forest, Q. mongolica-Pinus rigida community, P. rigida-Q. mongolica community, Q. monogolica community and so on. According to the classification by TWINSPAN, 61 survey plots were divided into 9 groups; Q. mongolica-Alnus japonica-R. pseudoacacia-P. densiflora, R. pseudoacacia-Styrax japonica, P. rigida-R. pseudoacacia-Q. mongolica, R. pseudoacacia-P. rigida-Q. mongolica-A. hirusta, Q. mongolica-P. thunbergii, and prunus sargentii-Zelkova serrata community. From this result, ecological succession trend of vegetation seems to be change from artificial result, ecological succession trend of vegetation seems to be change from artificial planting forest to native plant community which was dominated by Quercus spp.. This study area need to manage for the increase of biodiversity through the restoration of naturalness by ecological management of artificial planting forest and ecological planting of injured green space.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.577-584
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• 2000

Seismic refraction survey was peformed for 10 lines along NE-SW and NW-SE directions above Nampoong gallery at Makyo-ri, Dogye, Samcheok, Kangwon-do. 48 geophones were laid in line with the interval of 1m, and a 5Kg hammer was used as a source at 5 points for each line. Data processing was done using reciprocal time method, GRM, and traveltime tomography which utilizes wavefront expansion method for forward process and SIRT for inversion. The result shows that the first layer has its lower boundary between 3.49m and 8.88m. The P-wave velocity of the first and the second layer were estimated as 270 360m/s and 1550 1940m/s respectively. When the boundary of the first and second layer is smooth enough and the velocity difference is large enough, GRM has little advantage over reciprocal time method. The result of reciprocal method and traveltime tomography shows consistency. The northeast part of the boundary has syncline structure, which is similar to the topography above. This implies that the collapse of the cavities of Nampoong gallery result in the subsidence of the ground surface. The subsidence is in progress across the Youngdong railroad, therefore a proper reinforcement work is required.

• 유기물자원화
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• 제8권1호
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• pp.69-76
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• 2000

The aim of this study was to evaluate the feasibilities on national recycling goal upto 40% in 2002 or more in the future. Sampling survey, Including waste generation rates, seperated recyclables and collection forces, covered households of 16,199 units, work places of 90 units and road length of 159km in Seoul. Survey results were used to calculate amounts of solid waste and recyclables according to physical properties, policy oriented measures, generator sand collection forces. This study founded followings ; Seoul's solid waste totaled 11,098ton/day, about 45% of which were recyclables and supposed to maximun level for recycling. Therefore, national goal for recycling proved to be attainable At this time,71.4% of recyclables was seperated by generators, and to stimulate the seperation activities of recyclables, endeavor of establishments, which seperated 65.6% of their recyclables, will be needed more than one of residence, which did 87.4% of their recyclables. Private forces collected 86.6% of recyclables seperated by generators, and have collection potentials equivalent to all recyclables generated in Seoul. But some incetives should be introduced to encourage private forces' activities, because values of recyclables to be collected in the future are lower than that did now.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 1999년도 춘계 공동학술발표회
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• pp.90-93
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• 1999

We present a high frequency electromagnetic (EM) inversion scheme for detecting and characterizing a fracture using single-hole data. At high frequencies, say above tens of mega-hertz, since displacement currents cannot be ignored, electrical permittivity as well as electrical conductivity is to be considered together for analyzing the EM scattering data. In this paper, we have developed a three-step inversion scheme to map the fracture and to evaluate its electrical conductivity and permittivity. We performed EM profiling along the z-axis using three-component receivers for each source. The model was excited by a vertical magnetic dipole and the resistant magnetic fields were inverted using the non-linear least-squares method. Background resistivity and permittivity were easily obtained using vertical magnetic fields below 1 MHz and above 10 MHz, respectively. Both the vertical and dipping sheets were successfully mapped using the phase difference between 40 and 41 MHz. The electrical property of the sheet was well resolved using the information obtained in the previous two steps and secondary magnetic fields. Our study shows the potential of imaging the fracture in single-hole survey environment using the high frequency EM method.

• Journal of Construction Engineering and Project Management
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• 제8권1호
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• pp.1-9
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• 2018

US transportation agencies are dealing with shrinking budgets, limited work forces, and deteriorating infrastructure. In order to cope with funding uncertainty, state highway agencies are now looking into their own organizations and identifying programs, practices, and processes that have potential for cost saving. A quality assurance (QA) program is an integral part of highway construction and ensures a project's contracted level of quality. The cost of quality (conforming and nonconforming) can constitute a sizable part of total construction cost. As the quality assurance programs evolved, various practices and processes were developed over time and later adopted by state highway agencies. These practices and processes include different QA standards and specifications, varying testing methods, central testing lab vs. on site testing, performance based vs. prescribed quality assurance practices, implementation of innovative quality assurance practices, etc. Therefore, there is an opportunity to assess different QA strategies and recommend those practices that are effective and cost efficient. A national survey was conducted by the authors, which provided a detailed mapping of various QA practices and processes used as part of QA programs and identified areas where agencies can focus on for cost savings. The survey found that QA sampling and testing plans, optimization of sampling plans, optimization of QA standards and specifications, and implementation of innovative test methods and processes are the main areas the agencies should focus to lean the current QA programs.

• 한국전자파학회논문지
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• 제24권7호
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• pp.701-709
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• 2013

본 논문에서는 미래 전파산업의 활성화를 위한 정책 방향을 도출하고자 하였다. 이를 위해 현재 진행되고 있는 전파 기술과 응용서비스의 발전에 따라 변화하는 전파산업의 개념과 구조를 제시하였다. 또한, 신 성장산업으로서 전파산업의 성장모형을 제시하고, 산업 활성화에 영향을 미치는 정책 요소로서 기술 개발, 서비스 개발, 법제도 개선, 비즈니스 모델 개발, 산업생산/이용지원, 홍보 강화 등을 도출하였다. 이 결과를 이용하여 전파산업의 구조적 특성에 따른 정책 방향에 대한 판단을 위하여 전파산업 활성화를 위한 정책사항에 관한 전문가 인터뷰 조사를 실시하였다. 이들 결과로부터 미래 전파산업 활성화를 위하여 필요한 정책 방향을 제시하였다