• 한국측량학회지
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• 제38권1호
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• pp.23-33
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• 2020

최근 UAV (Unmanned Aerial Vehicle)를 이용하여 고해상도 영상을 편리하게 취득할 수 있게 되면서 저비용으로 소규모 지역의 관측 및 공간정보 제작이 가능하게 되었다. 특히, 농업환경 모니터링을 위하여 작물생산 지역의 피복지도 생성에 대한 연구가 활발히 진행되고 있으며, 랜덤 포레스트와 SVM (Support Vector Machine) 및 CNN(Convolutional Neural Network) 을 적용하여 분류 성능을 비교한 결과 영상분류에서 딥러닝 적용에 대하여 활용도가 높은 것으로 나타났다. 특히, 위성영상을 이용한 피복분류는 위성영상 데이터 셋과 선행 파라메터를 사용하여 피복분류의 정확도와 시간에 대한 장점을 가지고 있다. 하지만, 무인항공기 영상은 위성영상과 공간해상도와 같은 특성이 달라 이를 적용하기에는 어려움이 있다. 이러한 문제점을 해결하기 위하여 위성영상 데이터 셋이 아닌 UAV를 이용한 데이터 셋과 국내의 소규모 복합 피복이 존재하는 농경지 분석에 활용이 가능한 딥러닝 알고리즘 적용 연구를 수행하였다. 본 연구에서는 최신 딥러닝의 의미론적 영상분류인 DeepLab V3+, FC-DenseNet (Fully Convolutional DenseNets), FRRN-B (Full-Resolution Residual Networks) 를 UAV 데이터 셋에 적용하여 영상분류를 수행하였다. 분류 결과 DeepLab V3+와 FC-DenseNet의 적용 결과가 기존 감독분류보다 높은 전체 정확도 97%, Kappa 계수 0.92로 소규모 지역의 UAV 영상을 활용한 피복분류의 적용가능성을 보여주었다.

• 한국산림과학회지
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• 제99권3호
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• pp.285-291
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• 2010

제5차 국가산림자원조사는 국가단위의 산림자원 통계량을 산출하기 위해 설계되어 2006년부터 야외 표본점 자료를 수집하고 있다. 하지만, 표본의 개수가 적은 소면적 시군구의 산림통계를 산출하기 위해서는 보정자료를 이용하는 소면적 추정기법의 적용이 요구된다. 본 연구에서는 야외 표본점의 위치정보를 활용할 수 있는 공간통계기반 합성추정법을 적용하여 소면적 시군구의 임상별 산림면적 및 ha당 평균축적 등을 추정할 수 있는 방안을 제시하기 위해 수행하였다. 먼저 조사된 표본점은 수종별 흉고단면적의 비율에 의해 임상별로 사후층화되었다. 합성추정법을 적용하기 위하여 목표 시군과 인접하는 시군들을 하나의 가상 시군으로 설정한 후, 이러한 가상 시군에 포함되는 표본점 자료를 산림통계량 산출에 이용하였다. 합성추정법에 의한 임상별 비율은 임상도와 차이가 있는 것으로 나타났다. 한편, 합성추정법에 의한 임상별 ha당 평균축적은 표준오차가 ${\pm}3.5\;m^3/ha{\sim}{\pm}7.7\;m^3/ha$로 직접추정에 의한 표준오차(${\pm}7.8\;m^3/ha{\sim}{\pm}24.7\;m^3/ha$)보다 낮아 상대적으로 정확한 추정치를 나타내었다.

• 한국지구과학회지
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• 제44권1호
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• pp.36-46
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• 2023

본 연구에서는 전라북도 군산시 백악기 산북동층의 전석에서 발견된 소형 새 발자국 화석을 간략히 기재하고, 척추동물 발자국 화석을 포함한 산북동층 퇴적 시기를 확인하기 위해 산북동층 응회암질사암에서 쇄설성 저어콘을 분리하여 SH RIMP U-Pb법 절대연령 분석을 실시하였다. 소형 새 발자국 화석은 보존상태가 양호하지 않으나, 보행렬을 이루는 두 개의 발자국과 세 개의 개별 발자국으로 구분된다. 이들은 물갈퀴가 없고, 비대칭이며 가느다란 세 개의 발가락으로 걷는 소형 새 발자국이다. 보행렬을 이루는 발자국은 Koreanaoris dodsoni?, 개별 발자국은 Koreanaornis ichnosp.로 동정하였다. 본 연구는 산북동층 사족동물 발자국 화석 군집이 수각류, 조각류, 익룡과 새 발자국으로 구성되어 있었음을 의미한다. 절대연대 분석 결과, 산북동층 퇴적시기의 최대지질연대는 112.5±5.8 Ma로 중생대 백악기 압트절(Aptian)에 해당하며, 경상분지 진주층 하부에 대비될 수 있다. 그러므로 산북동층의 백악기 소형 물떼새 발자국 화석(Koreanaornis)은 국내에서 가장 오래된 것으로 추정된다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 추계학술대회
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• pp.97-101
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• 2004

본 논문에서는 양식어장을 보호하기 위한 어장 탐지 시스템의 개발에 대해 논의한다. 어장탐지시스템(FDS)은 어장에 침입하는 도적 선박을 실시간으로 식별하고 어장의 위치변동 등을 파악한다. 어장으로의 접근 물체탐지 및 적아식별을 행하기 위해 저가이면서 대역의 레이더 응답기능을 갖는 어장작업선용 AIS(F-AIS)를 개발하여 소형어선 등의 식별기능에 이용하고자 한다.

• Journal of Welding and Joining
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• 제32권4호
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• pp.69-74
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• 2014

Welding distortions of large steel structures had mainly been estimated with some simplified formula obtained by lots of experience and numerical analyses for small steel structures. However, the large structures would have different characteristics of distortion with welding because of their own stiffness coming from the size itself. Therefore, in order to find some measures for preventing welding distortion of large structure, it is requite in advance to precisely analysis thermal stress and distortion during welding of the structure. Numerical analysis for larger structure has been known to take large amount of calculation time and have a poor convergency problem during the thermo-elasto-plastic calculation. In this study, a hybrid method is proposed to analysis the thermal stress and distortion of a large steel plate with the finite element analysis by incorporating with temperature distribution of the plate calculated by an analytical solution. The proposed method revealed that the thermo-mechanical analysis for welding of the large structure could be performed with a good convergence and produced precise results with much reduced time consumption.

• 영어어문교육
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• 제11권1호
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• pp.155-177
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• 2005

In the EFL context, Korean students don't have enough opportunities to directly experience the target culture, prompting the need to offer some well-organized culture education in class. The goals of this study are to analyze how many cultural contents are reflected in High School English textbooks and to suggest an implication for cultural learning. These textbooks were carefully examined, focusing on the cultural contents, by four categories: 'cultural skill section', 'cultural patterns', 'related language skills', and 'target countries'. The results of the analysis were like the following: First, although many of the textbooks are dealing with the culture skill sections, their contents were still wanting consistency and were small in quantity. Second, as for the cultural patterns, the pages dealing with behavioral culture were 43%, spiritual culture, 35.7%, material culture, 21.3%. Third, as for the related language skills, the cultural contents in the textbooks were organized in the order of listening, reading, speaking, writing, and cultural skill sections. Since it is impossible to separate language skills from culture, we suggest that the aspects of target culture should be incorporated in various forms into the learning situations. Fourth, as for the issue of target countries, the contents about the general or whole English culture were insufficient. So we suggest that English textbooks should play an essential role in providing students with various cultural information about various English speaking countries.

• ETRI Journal
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• 제22권2호
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• pp.11-19
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• 2000

If the right and left signals of a binaural sound recording are reproduced through loudspeakers instead of a headphone, they are inevitably mixed during their transmission to the ears of the listener. This degrades the desired realism in the sound reproduction system, which is commonly called 'cross-talk.' A 'cross-talk canceler' that filters binaural signals before they are sent to the sound sources is needed to prevent cross-talk. A cross-talk canceler equalizes the resulting sound around the listener's ears as if the original binaural signal sound is reproduced next to the ears of listener. A cross-talk canceler is also a solution to the problem-how binaural sound is distributed to more than 2 channels that drive sound sources. This paper presents an effective way of building a cross-talk canceler in which geometric information, including locations of the listener and multiple loudspeakers, is divided into angular information and distance information. The presented method makes a database in an off-line way using an adaptive filtering technique and Head Related Transfer Functions. Though the database is mainly concerned about the situation where loudspeakers are located on a standard radius from the listener, it can be used for general radius cases after a distance compensation process, which requires a small amount of computation. Issues related to inverting a system to build a cross-talk canceler are discussed and numerical results explaining the preferred configuration of a sound reproduction system for stereo loudspeakers are presented.

• Asian Pacific Journal of Cancer Prevention
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• 제13권9호
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• pp.4689-4693
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• 2012

Lung cancer is the most common type of cancer and one of the leading causes of death in the world. Genetic factors play an important role in its development. PDCD6, the encoding gene for programmed cell death protein 6, may function as a tumor suppressor gene. Non-small cell lung cancer (NSCLC) contributes about 80% to newly histologically diagnosed lung cancer patients. To explore the relationship between PDCD6 and NSCLC, we examined two single nucleotide polymorphisms(rs3756712 G/T andrs4957014 G/T, both in the intron region) of the PDCD6gene.A hospital-based case-control study was carried out including 302 unrelated NSCLC patients and 306 healthy unrelated subjects. Significantly increased NSCLC risk was found to be associated with the T allele of rs4957014 (P=0.027, OR=0.760, 95%CI=0.596-0.970). The genotype and allele frequencies of rs3756712 did not shown any significant difference between NSCLC group and controls (P=0.327, OR=0.879, 95%CI=0.679-1.137). In conclusion, we firstly demonstrated the association between the PDCD6 gene and risk of NSCLC in a Chinese Han population.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.272.1-272.1
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• 2016

In a three-dimensional topological insulator Bi2Se3, a stress control for band gap manipulation was predicted but no systematic investigation has been performed yet due to the requirement of large external stress. We report herein on the strain-dependent results for Bi2Se3 films of various thicknesses that are grown via a self-organized ordering process. Using small angle X-ray scattering and Raman spectroscopy, the changes of d-spacings in the crystal structure and phonon vibration shifts resulted from stress are clearly observed when the film thickness is below ten quintuple layers. From the UV photoemission/inverse photoemission spectroscopy (UPS/IPES) results and ab initio calculations, significant changes of the Fermi level and band gap were observed. The deformed band structure also exhibits a Van Hove singularity at specific energies in the UV absorption experiment and ab initio calculations. Our results, including the synthesis of a strained ultrathin topological insulator, suggest a new direction for electronic and spintronic applications for the future.

• 대한본초학회지
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• 제30권5호
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• pp.7-13
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• 2015

Objectives : The purpose of this study was to examine the prescription intention of Korean medicine doctors on botanical drug.Methods : The subjects in this study were 340 Korean medicine doctors in Korean medical institutions, on whom a survey was conducted from July 1 to August 31, 2014.Results : The factors that affected the prescription decision making of the Korean medicine doctors were drug superiority, level of Interest, Recognition, marketing of sales associates of pharmaceutical companies and satisfaction with information provided by those companies. When the internal consistency of the variables was measured, that was above 0.8.Conclusions : Accordingly, well-planned education and promotion efforts are required to encourage Korean medicine doctors to put more prescription intention in botanical drug. This study had some limitations : First, the subjects were selected in a manner to allow for the convenience of this researcher, and the findings might not be generalizable. Second, there was a problem with the time for the study in that there were quite fierce disputes on botanical drug at that time. Third, the majority of the subjects run their own hospitals, and the number of them was small. So it's not possible for them to represent every Korean medicine doctor.