• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.12 no.5
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• pp.475-481
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• 2019

A splint is one of assisting devices for the disabled with hemiplegia or contracture and is manually made by an experienced expert. Heated thermoplastic materials are continuously fitted to the affected part. This traditional method has a possible risk of low-temperature burn, quality variance of the splint due to the proficiency of maker. etc. While various approaches has been made using 3D printing technology in order to redeem those disadvantages, they still carry high cost issues with 3D scanners or accuracy issues with manual measurement. This research begins with symmetrical characteristics of human body and focuses on the preliminary study for the possibility of splint manufacturing with 3D printing technology based on geometric characteristics of unaffected arm. 3D right and left forearm models of healthy male adults were created by photogrammetry software and a series of digital images in order to measure the circumference and cross-sectional area of the forearm models at every 20mm from the elbow. The circumference and cross-sectional area showed tolerable levels of differences between both sides within subjects; The circumference and cross-sectional area showed very strong correlations between both sides within subjects. From these findings, the possibility of splint manufacturing with 3D printing technology could be confirmed based on the geometric characteristics of unaffected side.

• Journal of Navigation and Port Research
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• v.43 no.1
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• pp.64-71
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• 2019

It is very important to understand the mechanism of estuary topographic changes for the study of estuary management and treatment methods. In this study, the effects from the land-side, such as rainfall, river discharge, sediment discharge, and sea side, such as tide, tidal current, wave and surface sediments related to the topographic changes of the Nakdong river estuary were investigated and analyzed. Based on the analyzed data, topographic modeling was performed to analyze the topographic change and contribution of external force conditions. As a result of numerical modeling, the topographic change showed that erosion that predominates in the water directly affected by the discharge of the estuary barrage. The deposition predominates in the indirectly affected tideland. As sediments moved along the water way being sorted and distributed by the wave, the deposition predominated in the front of the barrier island. Compared with the deposition dominance, which is the result of the topographic change prediction, the impact of each external force condition gives larger erosion. However, the combined impact of each external force condition showed deposition dominant. Therefore, the topographic changes of the Nakdong river estuary are considered to be the result of various complex external factors. The impacts of each external force condition show the different contribution to each comparison area. These results should be considered when establishing the estuary management method. It must be understood that this is the result of complex interactions.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.4
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• pp.459-468
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• 2022

Long-term data analyses and bioassay experiments were conducted to assess limiting nutrients in Cheonsu Bay and Taean sea. First, long-term nutrient data (2004-2016) provided by the National Water Quality Monitoring Network were used to assess potential limiting nutrients. Analysis of the long-term data showed that the dissolved inorganic nitrogen/dissolved inorganic phosphate (DIN/DIP) ratio was mostly below 16, with N limitation being dominant. A subsequent analysis using the concentration ratios of N, P, and Si showed that N limitation was dominant during summer and autumn but that Si limitation occasionally occurred during winter and spring in relatively limited areas. However, the dominant limiting nutrient was not determined. The nutrient analysis of the field water collected during the bioassay experiment showed that DIN/DIP revealed P limitation at all stations in March and May, whereas N limitation was dominant in July and October. In the analysis using the concentration ratios of N, P, and Si, P and Si limitation appeared in March and May, but there were points with no dominant limiting nutrient. However, N limitation was dominant in July and October. In the bioassay experiment for assessment of the actual limiting nutrient, the results showed no specific limiting nutrient in March, whereas NH₄⁺ and NO₃^- showed responses in May, July, and October, which confirmed that N was a substantial limiting nutrient directly involved in phytoplankton growth during this period.

• The Journal of the Acoustical Society of Korea
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• v.41 no.2
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• pp.184-191
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• 2022

Underwater acoustic wave in shallow water is propagated through multipath that has a large delay spread causing Inter-Symbol Interference (ISI) and these characteristics deteriorate the performance in the communication system. In order to analyze the communication performance and investigate the correlation with multipath delay spread in a reverberant environment, an underwater acoustic communication experiment using Binary Phase-Shift Keying (BPSK) signals with symbol rates from 100 sym/s to 8000 sym/s was conducted in a 5 × 5 × 5 m³ water tank. The acoustic channels in a well-controlled tank environment had the characteristics of dense multipath delay spread due to multiple reflections from the interfaces and walls within the tank and showed the maximum excess delay of 40 ms or less, and the Root Mean Squared (RMS) delay spread of 8 ms or less. In this paper, the performances of Bit Error Rate (BER) and output Signal-to-Noise Ratio (SNR) were analyzed using four types of communication demodulation techniques. And the parameter, Symbol interval to Delay spread Ratio in reverberant environment (SDR_rev), which is the ratio of symbol interval to RMS delay spread in the reverberant environment is defined. Finally, the SDR_rev was compared to the BER and the output SNR. The results present the reference symbol rate in which high communication performance can be guaranteed.

• The Magazine for Energy Service Companies
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• s.7
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• pp.30-33
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• 2000

전자동 폐수열회수장치의 개발로 인해 YTC엔텍의 주가가 치솟고 있다. 내년도에도 유가가 고공행진을 할 것이라는 전망이 우세한 가운데 이 장치에 관련업계의 관심이 모아지고 있다. 연평균 $30\%$ 이상의 연료절감효과를 나타낼 것으로 보이는 이 장치를 ESCO사업 방식을 통해 YTC엔텍이 보급에 나섰다.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2002.11a
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• pp.190-190
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• 2002

• The Korean Publising Journal, Monthly
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• s.153
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• pp.4-5
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• 1994

역설적이게도 죽음을 통해 비로소 독서대중의 전면에 등장하게 된 김일성에 대해 그동안의 우리는 백지상태나 마찬가지였다. 사실의 규명보다 정치적 선전의 필요가 압도적으로 우세했던 시대에 김일성은 다만 한국현대사의 악역으로 비난받고 무시되는 존재였고, 따라서 그에 대한 객관적 연구나 그것의 출판은 거의 불가능한 형편이었다.

• 전기의세계
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• v.38 no.2
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• pp.5-16
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• 1989

신경컴퓨터에 대한 연구는 1940년대부터 시작되었다. 이 신경 컴퓨터는 현재 패턴 인식, 음성인식 분야에서 성공적인 결과를 제시하고 있으며, 기존의 컴퓨터보다 우월한 응용 분야로 생각되어지는 분야로는 학습, 인식 등으로서 정밀도를 요하는 수학적 계산 분야는 디지탈 컴퓨터가 역시 우세하다. 따라서 장래의 컴퓨터는 기존의 디지탈 컴퓨터와 신경 컴퓨터가 하이브리드 형태로 된 것으로 발전할 것이다.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2004.11a
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• pp.99-99
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• 2004

• Defense and Technology
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• no.2 s.156
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• pp.40-47
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• 1992

오늘날 전장을 지배하는 전투력은 기갑전투력이라고 해도 과언이 아니며, 특히 기갑전력의 숫적인 열세를 질적인 우세로 만회하고자 하는 우리의 현실 여건을 고려한다면, 우수한 전차의 성능 뿐만 아니라 우수한 승무원의 확보가 필연적이다. 이에 따라 본 지면을 빌려서 필자는 전차포술 훈련에 시뮬레이션 기법을 적용해야될 필요성과 현계 세계 각국이 쓰고 있는포술 훈련 시뮬레이션 기법을 소개.평가하고, 가장 효과적이고 경제적인 포술 훈련 시뮬레이션 기법 응용 방법을 제안하고자 한다