• 한국항공우주학회지
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• 제42권5호
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• pp.368-375
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• 2014

지역기반 위성항법보강시스템 (GBAS : Ground Based Augmentation System)은 환경적인 요인에 많은 영향을 받기 때문에 설치 운영될 지역의 환경 요인 분석이 중요하다. 본 연구는 위성 앙각을 고려한 B-Value의 시그마 팽창을 제안하여 대립가설의 VPL (Vertical Protection Level) 성능을 분석하였다. 또한 해당지역의 환경조건을 만족하는 데이터를 수집하여 위성앙각 $5^{\circ}$ 간격의 시그마 팽창계수를 산출하였다. 산출된 결과는 위성앙각에 따라 커브피팅을 통해 함수화하여, 실험지역의 환경조건 (태양활동, 습윤 지연)에 알맞은 시그마 팽창을 제안하였다. 위성 앙각에 따른 시그마 팽창계수 분석결과 습윤 지연에 의한 영향은 미미했으나, 태양활동에 의한 영향은 태양활동이 활발할수록 시그마 팽창계수가 증가하는 것을 확인할 수 있었다. 또한, 위성 앙각을 고려한 시그마 팽창 계수의 적용으로, 기존 방법 대비 무결성 뿐만 아니라 고앙각 위성에서의 불필요한 마진 제거가 가능하여 가용성이 향상됨을 확인할 수 있었다.

• The Journal of Korean Physical Therapy
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• 제24권6호
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• pp.388-392
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• 2012

Purpose: Muscle imbalance between upper trapezius (UT) and serratus anterior (SA) during arm elevation is a factor causing shoulder dysfunction. However, there is no study to compare the muscle activities of the UT and middle deltoid (MD). The purpose of this study was to compare the muscle activities of the UT and MD between with and without elevation of shoulder girdle (ESG) during shoulder abduction. Methods: The subjects without (control group=9) or with (ESG group=8) participated in this study. The muscle activities of the UT and MD were measured using a electromyography during $90^{\circ}$ shoulder abducted position in both group. The data in middle of 3-second of the 5-second periods were used. The mean value of three trials was used in the data analysis. For each muscle, independent t-tests were performed to compare for group differences. Results: The muscle activity of UT was significantly greater in ESG group, compared to that of the control group (p<0.05). The muscle activity of MD was significantly smaller in ESG group, compared to that of the control group (p<0.05). Conclusion: These findings showed that low muscle activation of MD as well as SA may contribute to hyperactivity of UT during arm elevation.

• 한국지역지리학회지
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• 제16권2호
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• pp.100-109
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• 2010

미국 메사추세츠주 보스턴시의 네폰셋 강의 서로 다른 토지이용지역을 사례지역으로 선정하여, 강의 밑짐으로 토지이용의 차이를 분석할 수 있는지 실험하였다. 네폰셋 강은 거주지역, 산업지역, 농업과 삼림지역 등으로 토지이용이 구분되는데, 토질의 화학적 특성이 가장 차이가 나는 거주지역과 삼림지역 두 곳을 찾아 매닝의 'n'값과 HEC-RAS 모델의 결과치를 비교하여 두 지역의 차이를 분석하였다. HEC-RAS는 US Army Corp에서 개발한 모델로 강의 윤곽 및 흐름, 진행 및 경사 등을 면밀하게 분석할 수 있다. 거주지역 분석 결과는 매닝의 계수와 HEC-RAS 결과치가 매우 다르게 나타나는데, 이는 인공적으로 설치된 강 하류의 댐과 일반적이지 않은 경사에 기인한다고 판단되었다. 일반적인 경사를 지닌 댐상류에는 임계수위가 나타나는데, 매닝의 'n' 계수가 서로 다른 깊이를 반영해주고 있다. 댐은 강의 분리와 유속에 많은 영향을 미치고 있고, 상류 수위는 증가하는 대신 유속은 감소하게 된다. HEC-RAS 모델은 강의 구조와 형태 및 행태 등을 분석하는데 좋은 기법으로, 현재 많은 연구의 대상이 되고 있는 도시 내 강의 관리와 지역개발에 지리학적으로도 크게 활용할 수 있을 것이라 예상된다.

• 한국농공학회지
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• 제45권6호
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• pp.109-118
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• 2003

As a fundamental research to establish a safety operation plan for irrigation dams, this study presents hydrologic analysis conducted in Sungju Dam watershed based on various rainfall data. Especially those reservoirs without flood control feature are widely exposed to the risk of flooding, a safe and optimized operation program need to be improved against arbitrary flooding. In this study, reservoir routing program was developed and simulated for reservoir runoff estimation using WMS hydrology model. The model simulated the variations of reservoir elevation under the condition of open or closed emergency gate. In case of closed emergency gate, water surface elevation was given as 193.15 m, and this value exceeds the dam crest height by 1.65 m. When the emergency gate is open, the increment of water surface elevation is given as 192.01 m, and this value exceeds dam crest height by 0.57 m. As an alternative plan, dam height increase can be considered for flood control under the PMP (Probable Maximum Precipitation) condition. Since the dam size is relatively small compare to the watershed area, sound protection can be expected from the latter option rather than emergency gate installation.

• 제어로봇시스템학회논문지
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• 제11권1호
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• pp.41-49
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• 2005

Electromyogram (EMG) signal generated by voluntary contraction of muscles is often used in rehabilitation devices because of its distinct output characteristics compared to other bio-signals. This paper proposes a novel EMG-based human-computer interface for electric-powered wheelchair users with motor disabilities by C4 or C5 spine cord injury. User's commands to control the electric-powered wheelchair are represented by shoulder elevation motions, which are recognized by comparing EMG signals acquired from the levator scapulae muscles with a preset double threshold value. The interface commands for controlling the electric-powered wheelchair consist of combinations of left-, right- and both-shoulders elevation motions. To achieve a real-time interface, we implement an EMG processing hardware composed of analog amplifiers, filters, a mean absolute value circuit and a high-speed microprocessor. The experimental results using an implemented real-time hardware and an electric-powered wheelchair showed that the EMG-based human-computer interface is feasible for the users with severe motor disabilities.

• 한국의류학회지
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• 제27권6호
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• pp.643-653
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• 2003

The purpose of this study was to investigate the relation of desire for aesthetic surgery and clothing attitude of female with their body satisfaction, need, and self-esteem. Subjects were 813 females of 10's to 40's living in Daejeon Metropolitan City and Gongju City, Chungchungnamdo. Results from this research revealed that the correlation of desire for aesthetic surgery with body satisfaction was negative so that female satisfying one's body shape didn't want to have aesthetic surgery. However, aesthetics and sexual attractiveness of clothing had positive correlations with body satisfaction. It was also shown that the need and self-esteem of female affected directly on the desire for aesthetic surgery and the pursuit of clothing aesthetics. Women with higher need for exhibition and dominance were not only concerned about the elevation of their appearance through their clothing but also recognized the value of modifying their appearance through aesthetic surgery. Women with higher self-esteem were interested in the elevation of their appearance through clothing, but the other hand, they showed negative attitude toward modifying their appearance via aesthetic surgery. This result revealed the fact that women with higher self-esteem had a tendency to keep the traditional sense of value and as a result, showed negative attitude toward the aesthetic surgery.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.393-395
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• 2003

The changes of DEMs(Digital Elevation Models) will be detected to correct the information of DEMs and/or to get the information about themselves. This study suggests the evaluation of DEM using correlation coefficient value between the target and the reference DEMs for detect the changes.

• 식물병연구
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• 제9권3호
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• pp.179-182
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• 2003

아인산염을 이용하여 감자 역병방제 시험을 실시한 결과 해발 100m 의 해안지역에서 방제가는 82.5%로 dimethomorph + copper oxychloride 500배액 처리시 방제가 75.9%보다 효과적이었다. 그러나 해발 300 m의 중산간 지대에서는 높은 습도와 잦은 비 날씨로 방제가가 40.0%로 낮았으나 농약처리 효과와 비슷하였다. 감자 역병 방제를 위한 아인산염 살포 간격은 15일이 적합하였다.

• 물과 미래
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• 제29권3호
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• pp.129-142
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• 1996

본 연구는 일점 측정을 토대로 연직 유사 농도 계산시 예상되는 입력 자료의 부정확함 때문에 발생하는 오류의 크기를 연구하였다. 오류 가능성이 있는 원인인 채취기의 위치, 수면 및 하상고도, 침강 속도, $\beta$ 와$\kappa$ 값은 미국 리오그란데 강으로부터 얻는 자료를 사용하여 비교, 검증되었다. 그 결과 일점 부유사 채취를 토대로 간편한 유사 농도식과 속도 분포식을 사용하여 평균 유사 농도를 산정할 수 있었다. 이 계산 중에서 가장 불확실한 점은 부유사의 연직 유사 분포식에서 Rouse수인 z였다.

• 물과 미래
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• 제10권1호
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• pp.101-117
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• 1977

The statatistical characteristics and spectra of sea waves at Mookho were analysed by several statistical methods. As the results, the following conclusions are obtained: 1. Values of surface elevation of sea wave are better fitted to Gram Charlier distribution than Gaussian distribution. This proves that sea waves have not only characters of irregularity but also non-linearity. 2. Distribution of maxima of surface elevation practically follows the distribution of Cartwright and Longuet-Higgins, also spectral width parameter is found to be increased with the increase of root mean square of surface elevation. 3. Sea wave may have spectrum of broad frequency band, however distributions of wave heights and periods follow the Rayleigh distribution which is derived from the assumption of narrow frequency band. 4. Ratios among mean wave heights from observed data show good agreements with theoretical values from Rayleigh distribution. 5. Spectral density and spectral width parameter increase with increase of wind velocity. And wave period at optimum band gas higher value than significant wave period by about 10 percent.