• 항공우주정책ㆍ법학회지
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• 제6권
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• pp.267-283
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• 1994

Application of space technology in the field of communication and remote sensing becomes increasingly important in human life. Advancement of communications means shinks the size of our globe and that of remote sensing techniques improves the quality of human well-being. It is a world trent for each country to make its best effort in advancing its capabilities in these fields sometimes independently and other times jointly with other nations. Korea being no exception to this world trend is planning various starategies in application and development of space technologies. However, unfortunately, Korea is a new commer in this field. Statellite Technology Research Center (SaTReC) of Korea Advanced Institute of Science and Technology (KAIST) initiated to aquire satellite technology by sending its graduates abroad in 1989. As a result KITSAT-1 was launched in 1992 and KITSAT- 2 was launched in 1993 and they became Korea's first two satellites in orbits. Academic program including On-the Job-Training for Korean students at the University of Surrey, UK, is also an innovative scheme of mixing education and practical know-how for successful technology transfer, which resulted in a small but very capable and effective satellite experts group in Korea for self-propelled research and development in space activities. In this context, space development strategy should be considered in terms of the following factors; (1). Participation in international space activities as an active member to utilize international organization and to contribute to the peaceful use of space, (2). Development of national defence structure for independent activities in space, (3). Enhancement of manpower utilization for space development and promotion of national pride and (4). Education of youngsters for the extension of intellectual activities into the limitless space. In order to make very costly space development project most efficient, governmental level space development organization directed by the head of nation should be established and should manage all space development programs making full use of its all available resources including the advantage of the university based R&D capability.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.43-46
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• 2015

최근 전이중방식의 통신 개념이 차세대 이동통신의 유력한 기술로 주목받고 있다. 본 논문에서는 전 이중방식으로 동작하는 일반화된 공간변조시스템에서 전송된 신호를 압축센싱에 기반하여 검출하는 기법을 제안한다. 전 이중방식으로 동작하는 일반화된 공간변조 시스템에서는 전체 안테나 중 일부의 안테나가 신호를 전송하고 신호 전송에 사용되지 않은 나머지 안테나를 이용하여 동일한 주파수로 수신되는 신호를 검출한다. 본 논문에서는 최근에 개발된 자기 간섭 제거 기술을 활용하여 자신이 전송한 신호에 의한 간섭은 수신안테나로 사용되고 있는 안테나에서는 완벽히 제거된다고 가정한다. 제안된 압축센싱에 기반한 신호 검출 기법은 기존의 신호 검출 기법에 비하여 훨씬 더 좋은 성능을 보인다. 추후, 전 이중방식으로 동작하는 일반화된 공간변조 시스템에서 사용할 전송 안테나의 개수를 최적화 하는 연구를 진행할 예정이다.

• 전자공학회논문지SC
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• 제47권3호
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• pp.56-62
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• 2010

전기장은 수중에서의 주변 환경 인지, 물체 확인 과정에 사용 될 수 있다. 약한 전기장을 발생시키는 전기물고기는 전기장을 발생시켜 그 왜곡을 감지함으로써 주위 상황을 인지하고 먹이를 찾는 "능동 센싱"에 특화되어 있다. 이러한 "능동 센싱"과정은 전기물고기가 어두운 바다 속에서 시각적인 정보 없이도 먹이를 찾고 주변 환경을 탐지할 수 있게 해준다. 전기물고기는 몸 전체에 전기수용기를 가지고 있다. 수많은 전기수용기를 통해 읽어지는 센서 값은 '전기장 이미지', 즉 시각적인 이미지가 아닌 전기장의 변화를 반영하는 물리적 이미지로 표현된다. 많은 사람들이 전기물고기가 시각 정보 없이도 전기장 이미지를 통해 어떻게 상황을 인지할 수 있는지 연구해 왔다. 많은 연구를 통해 전기장 이미지의 최대값, 기울기, 넓이, 피크의 위치 등이 목표 물체를 찾기 위한 단서로 사용될 수 있다는 사실이 이미 알려져 있다. 이 논문에서는 전기물고기의 전기장 이미지를 바탕으로 목표 물체 이외에 배경으로 생각할 수 있는 다른 물체가 있는 좀 더 복잡한 환경에서, 전기장 센서를 통해 목표 물체를 배경으로부터 분리하고 인지할 수 있는 방법을 제안한다. 이러한 복잡한 상황에서의 물체 인지 과정은 수중로봇의 물체인식에 활용될 수 있다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.429.2-429.2
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• 2014

ZnO nanowire is known as synthesizable and good mechanical properties. And, stimuli-responsive polymer is widely used in the application of tunable sensing device. So, we combined these characteristics to make precise tunable sensing devise. In this work, we investigate the dependence of ZnO nanowire alignment and morphology on si substrate using nanosphere template with various conditions via hydrothermal process. Also, pH-temperature dependant tuning ability of nanostructure was studied. The brief experimental scheme is as follow. First, Zno seed layer was coated on a si wafer ($20{\times}20mm$) by spin coater. And then $1.15{\mu}m$ sized close-packed PS nanospheres were formed on a cleaned si substrate by using gas-liquid-solid interfacial self-assembly method. After that, zinc oxide nanowires were synthesized using hydrothermal method. Before the wire growth, to specify the growth site, heat treatment was performed. Finally, NIPAM(N-Isopropylacrylamide) was coated onto as-fabricated nanostructure and irradiated by UV light to form the PNIPAM network. The morphology, structures and optical properties are investigated by FE-SEM(Field Emission Scanning electron Microscopy), XRD(X-ray diffraction), OM(Optical microscopy), and WCA(water contact angle).

• 대한원격탐사학회지
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• 제36권1호
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• pp.29-39
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• 2020

Forest fire is a critical disaster that causes massive destruction of forest ecosystem and economic loss. Hence, accurate estimation of the burned area is important for evaluation of the degree of damage and for preparing baseline data for recovery. Since most of the area size damaged by wildfires in Korea is less than 1 ha, it is necessary to use satellite or drone images with a resolution of less than 10m for detecting the damage area. This paper aims to detect wildfire-damaged area from a Kompsat-3 image using the indices such as NDVI (normalized difference vegetation index) and FBI (fire burn index) and to examine the classification characteristics according to the methods such as Otsu thresholding and ISODATA(iterative self-organizing data analysis technique). To mitigate the salt-and-pepper phenomenon of the pixel-based classification, a gaussian filter was applied to the images of NDVI and FBI. Otsu thresholding and ISODATA could distinguish the burned forest from normal forest appropriately, and the salt-and-pepper phenomenon at the boundaries of burned forest was reduced by the gaussian filter. The result from ISODATA with gaussian filter using NDVI was closest to the official record of damage area (56.9 ha) published by the Korea Forest Service. Unlike Otsu thresholding for binary classification,since the ISODATA categorizes the images into multiple classes such as(1)severely burned area, (2) moderately burned area, (3) mixture of burned and unburned areas, and (4) unburned area, the characteristics of the boundaries consisting of burned and normal forests can be better expressed. It is expected that our approach can be utilized for the high-resolution images obtained from other satellites and drones.

• 대한원격탐사학회지
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• 제27권3호
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• pp.315-328
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• 2011

Landsat data incorporated with additional bands-normalized difference vegetation index (NDVI) and band ratios were used to assess the extent and rate of deforestation in the Gunung Mutis Nature Reserve (GMNR), a mountainous tropical forest in Eastern of Indonesia. Hybrid classification was chosen as the classification approach. In this approach, the unsupervised classification-iterative self-organizing data analysis (ISODATA) was used to create signature files and training data set. A statistical separability measurement-transformed divergence (TD) was used to identify the combination of bands that showed the highest distinction between the land cover classes in training data set. Supervised classification-maximum likelihood classification (MLC) was performed using selected bands and the training data set. Post-classification smoothing and accuracy assessment were applied to classified image. Post-classification comparison was used to assess the extent of deforestation, of which the rate of deforestation was calculated by the formula suggested by Food Agriculture Organization (FAO). The results of two periods of deforestation assessment showed that the extent of deforestation during 1989-1999 was 720.72 ha, 0.80% of annual rate of deforestation, and its extent of deforestation during 1999-2009 was 1,059.12 ha, 1.31% of annual rate of deforestation. Such results are important for the GMNR authority to establish strategies, plans and actions for combating deforestation.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.549-549
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• 2012

Early detection of cancer biomarkers in the blood is of vital importance for reducing the mortality and morbidity in a number of cancers. From this point of view, immunosensors based on nanowire (NW) and carbon nanotube (CNT) field-effect transistors (FETs) that allow the ultra-sensitive, highly specific, and label-free electrical detection of biomarkers received much attention. Nevertheless 1D nano-FET biosensors showed high performance, several challenges remain to be resolved for the uncomplicated, reproducible, low-cost and high-throughput nanofabrication. Recently, two-dimensional (2D) graphene and reduced GO (RGO) nanosheets or films find widespread applications such as clean energy storage and conversion devices, optical detector, field-effect transistors, electromechanical resonators, and chemical & biological sensors. In particular, the graphene- and RGO-FETs devices are very promising for sensing applications because of advantages including large detection area, low noise level in solution, ease of fabrication, and the high sensitivity to ions and biomolecules comparable to 1D nano-FETs. Even though a limited number of biosensor applications including chemical vapor deposition (CVD) grown graphene film for DNA detection, single-layer graphene for protein detection and single-layer graphene or solution-processed RGO film for cell monitoring have been reported, development of facile fabrication methods and full understanding of sensing mechanism are still lacking. Furthermore, there have been no reports on demonstration of ultrasensitive electrical detection of a cancer biomarker using the graphene- or RGO-FET. Here we describe scalable and facile fabrication of reduced graphene oxide FET (RGO-FET) with the capability of label-free, ultrasensitive electrical detection of a cancer biomarker, prostate specific antigen/${\alpha}$ 1-antichymotrypsin (PSA-ACT) complex, in which the ultrathin RGO channel was formed by a uniform self-assembly of two-dimensional RGO nanosheets, and also we will discuss about the immunosensing mechanism.

• 공학교육연구
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• 제13권6호
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• pp.3-13
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• 2010

본 연구의 목적은 공과대학생의 학습양식 유형을 분석하고, 학습양식에 따른 의사소통 불안 수준의 차이를 검증하는 것이다. K대학교에 재학 중인 공과대학 1학년생 405명을 대상으로 학습양식을 분석한 결과, 감각적 학습자는 61%, 시각적 학습자는 73.1%, 숙고하는 학습자는 80%, 총체적 학습자는 66.7%로서 우세한 비율을 차지하는 나타났다. 성별에 따른 학습양식의 차이에서는 정보처리 차원에서 유의한 차이를 보였으며, 여자가 남자보다 숙고하는 학습양식을 선호하는 것으로 나타났다. 학습양식에 따른 의사소통 불안 수준의 차이를 분석한 결과, 정보지각과 정보처리 차원에서 유의한 차이를 보였다. 감각적 학습자가 직관적 학습자보다, 숙고하는 학습자가 적극적 학습자보다 더 높은 수준의 의사소통 불안을 느끼는 것으로 나타났다. 연구결과에 기초하여 의사소통 교육 프로그램을 실행할 때, 학습자의 학습양식을 고려하여 의사소통 불안 수준을 최소화할 수 있는 전략에 대한 시사점을 제안하였다.

• 한국생활과학회지
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• 제24권5호
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• pp.663-676
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• 2015

The purpose of this study was to examine whether any differences can be found in body comparison, body satisfaction, and appearance management behaviors according to the MBTI's typology among male and female adolescents in Gwangju and South Jeolla province, South Korea. It was conducted by a self-report survey of 534 male and female high school students in Gwangju and South Jeolla province. The collected survey data were analyzed by Means, Cronbach's ${\alpha}$, Factor analysis, and t-test using the SPSS/PC WIN 19.0 statistical program. The results were as follows: Introversion Type(I) teens tend to think a thinner body is closer to the ideal when compared to Extroversion type(E) students. They spend less time comparing their bodies with their peers. However, they usually have lower levels of body satisfaction and are more likely to be concerned about acne. Intuition Type(N) students tend to have a body figure that is a little plumper than Sensing Type(S) teens. They are inclined to try and lose weight and are concerned about acne. Sensing Type(S) students are more likely to compare their bodies with their peers than Intuition Type(N) teens. However, they are generally less satisfied with their bodies. Feeling Type(F) teens are more concerned with harmony and personal hygiene the Thinking Type(T) students. Judging Type (J) students generally want to be thinner than their current body type when compared with Perceiving Type(P) teens. When Judging Type(J) teens decide they need to be on a diet, they do their best to lose weight even if it means exercising and forgoing their favorite foods. These results indicate that it would be more effective to offer guidance to teens while taking into consideration their differences in terms of appearance management behaviors based on the MBTI Topology of Adolescents.

• 전자공학회논문지SC
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• 제42권2호
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• pp.33-38
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• 2005

신체 내 혈당 변화량과 $^1H$ 원자핵의 스핀-격자 완화시간의 변화량이 관련 있음과 원자핵의 스핀-격자 완화시간을 측정하는 방법으로 자기공명흡수법이 제안된 바 있다. 자기공병흡수법에 의하여 신체 내 혈당 변화량을 감지하기 위해서는 검출 영역내 고수준의 자기장의 세기와 균일도의 확보가 필수적이다. 가정에서 손쉽게 혈당의 변화량을 측정할 수 있도록, 본 논문에서는 가정용으로 적합한 크기와 무게를 가지면서 요구되는 자기장의 세기와 균일도를 확보한 무혈혈당측정기를 디자인하였다. 여러 형상과 재질을 갖는 초기 모델들을 설계, 제작하였고, 검출 영역의 자기 특성을 비교하여 최종 재질을 결정하였다. 또한, 유한요소 해석모델을 구축하고 형상 최적화를 통하여 최종 모델을 선정하였다.