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Static Analysis of a Small Scale Ducted-Fan UAV using Wind Tunnel Data
Choi, Youn-Han,Suk, Jin-Young,Hong, Sang-Hwee The Korean Society for Aeronautical and Space Scie 2012 International Journal of Aeronautical and Space Sc Vol.13 No.1
This paper discusses the mathematical modeling of a small scale ducted-fan UAV and examines its results in comparison to the wind tunnel test. A wind tunnel test is first performed, producing a substantial amount of test data. The acquired set of wind tunnel test data is then categorized and approximated as mathematical functions. Finally, the mathematically modeled forces and moments acting on the UAV are compared with the acquired wind tunnel data. The analysis involves a gradient-based algorithm and is applied to extract trim states with respect to various flight conditions. Consequently, a numerical analysis demonstrates that there exists a reasonable flight status with respect to airspeed.
아토바스타틴의 새로운 약물 적응증 탐색을 위한 비정형 데이터 분석
정휘수 ( Hwee-soo Jeong ),강길원 ( Gil-won Kang ),최웅 ( Woong Choi ),박종혁 ( Jong-hyock Park ),신광수 ( Kwang-soo Shin ),서영성 ( Young-sung Suh ) 한국보건정보통계학회(구 한국보건통계학회) 2018 한국보건정보통계학회지 Vol.43 No.4
Objectives: In recent years, there has been an increased need for a way to extract desired information from multiple medical literatures at once. This study was conducted to confirm the usefulness of unstructured data analysis using previously published medical literatures to search for new indications. Methods: The new indications were searched through text mining, network analysis, and topic modeling analysis using 5,057 articles of atorvastatin, a treatment for hyperlipidemia, from 1990 to 2017. Results: The extracted keywords was 273. In the frequency of text mining and network analysis, the existing indications of atorvastatin were extracted in top level. The novel indications by Term Frequency-Inverse Document Frequency (TF-IDF) were atrial fibrillation, heart failure, breast cancer, rheumatoid arthritis, combined hyperlipidemia, arrhythmias, multiple sclerosis, non-alcoholic fatty liver disease, contrast-induced acute kidney injury and prostate cancer. Conclusions: Unstructured data analysis for discovering new indications from massive medical literature is expected to be used in drug repositioning industries.
( Jeong Hwee Choi ),( Min Jae Gwak ),( In Jung Kang ),( Hee Kyeong Lim ),( Ki Heon Jeong ),( Ji Youn Sung ),( Nack In Kim ),( Min Kyung Shin ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Recent researches have investigated the use of autofluorescence (AF) to distinguish between normal and cancerous tissues according to different fluorescence characteristics. Objectives: The aim of this study was to analyse if AF can help differentiate cancerous lesions from other benign dermatitis. Methods: Paraffin-embedded tissue samples were obtained from patients who were histopathologically diagnosed with SCC, psoriasis, chronic dermatitis (lichen simplex chronicus, prurigo nodularis), or acute dermatitis (atopic dermatitis). AF intensities were measured from four layers of the epidermis: the corneal layer, granular layer, spinous layer, and basal layer, as well as two layers of the dermis: papillary dermis and reticular dermis. Results: AF was highest in psoriasis samples compared to all other groups in all layers. Higher AF values were seen in the SCC group as compared to all skin layers of the acute and chronic dermatitis groups; this finding was especially true in the corneal layer, papillary dermis, and reticular dermis. Conclusion: This ex vivo AF study may provide the basic data for future in vivo AF studies that will investigate the use of this non-invasive diagnostic tool.
Static Analysis of a Small Scale Ducted-Fan UAV using Wind Tunnel Data
Youn-Han Choi,Jinyoung Suk,Sang-Hwee Hong 한국항공우주학회 2012 International Journal of Aeronautical and Space Sc Vol.13 No.1
This paper discusses the mathematical modeling of a small scale ducted-fan UAV and examines its results in comparison to the wind tunnel test. A wind tunnel test is first performed, producing a substantial amount of test data. The acquired set of wind tunnel test data is then categorized and approximated as mathematical functions. Finally, the mathematically modeled forces and moments acting on the UAV are compared with the acquired wind tunnel data. The analysis involves a gradient-based algorithm and is applied to extract trim states with respect to various flight conditions. Consequently, a numerical analysis demonstrates that there exists a reasonable flight status with respect to airspeed.
견관절 외전 각도에 따른 중간 및 하부 승모근의 근 활성도 비교
이원휘 ( Won Hwee Lee ),하성민 ( Sung Min Ha ),박규남 ( Kyue Nam Park ),김수정 ( Su Jung Kim ),원종혁 ( Jong Hyuck Won ),최흥식 ( Houng Sik Choi ) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.1
The purpose of this study was to compare electromyography (EMG) activity for the middle and lower trapezius muscle according to various shoulder abduction angles. Thirty healthy male subjects were recruited for this study. Each subject performed three repetitions of horizontal abduction at 75°, 90°, 125°, 160°, and 180° of shoulder abduction angle in a prone position. Surface EMG activity was recorded from the middle and lower trapezius while the subjects held for five seconds at a predetermined position. The EMG activity was normalized using the maximal voluntary isometric contraction (MVIC) elicited using a manual muscle testing technique. A repeatedly measured ANOVA was performed by Bonferroni`s post hoc test. The EMG activity of the middle and lower trapezius was significantly different among shoulder abduction angles (p<.05). The greatest level of muscle activity for the middle and lower trapezius were demonstrated at 90° and 160° of shoulder abduction angle, respectively. These results suggest that middle and lower trapezius strengthening exercise and manual muscle testing should be performed at different shoulder abduction angles.
이복희,Young-Hwan Baek,Hwee-Sung Choi,Sung-Kyun Oh 한국물리학회 2007 Current Applied Physics Vol.7 No.3
shaped protrusion in SF6 gas. The breakdown voltagetime (Vt) characteristics and the breakdown voltagegas pressure (Vp) char-acteristics of a highly non-uniform SF6 gas gap under positive and negative lightning impulse voltages are investigated in the pressurerange between 0.1 and 0.5 MPa. The pre-breakdown developments are examined by the corona current and light emission measurementswith high time resolution. As a result, the dielectric strengths versus time-to-breakdown of SF6 gas gap under positive lightning impulsevoltages were nearly independent of the gas pressure. The rst streamer corona was initiated at the tip of the needle electrode, and thestreamer corona pulses developed with a stepwise propagation. The discharge paths were zigzag, and the branches of the discharge chan-nel for positive polarity were created. On the other hand, the leader channel in the negative polarity was thicker and brighter than that inthe positive polarity.
( Dong Hye Suh ),( Jeong Hwee Choi ),( Sang Jun Lee ),( Ki Heon Jeong ),( Kye Yong Song ),( Min Kyung Shin ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: High-intensity focused ultrasound (HIFU) and radiofrequency (RF) are used for non-invasive skin tightening. Neocollagenesis and neoelastogenesis have been reported to have a mechanism of controlled thermal injury. Objectives: To compare neocollagenesis and neoelastogenesis in each layer of the dermis after each session of HIFU and monopolar RF. Methods: We analyzed the area fraction of collagen and elastic fibers using the Masson’s trichrome and Victoria blue special stains, respectively, before and after 2 months of treatments. Histometric analyses were performed in each layer of the dermis, including the papillary dermis, and upper, mid,and deep reticular dermis. Results: Monopolar RF led to neocollagenesis in the papillary dermis, and upper, mid, and deep reticular dermis, and neoelastogenesis in the papillary dermis, and upper and midreticular dermis. HIFU led to neocollagenesis in the mid and deep reticular dermis and neoelastogenesis in the deep reticular dermis. Among these treatment methods, HIFU showed the highest level of neocollagenesis and neoelastogenesis in the deep reticular dermis. Conclusion: HIFU affects deep tissues and impacts focal regions. Monopolar RF also affects deep tissues, but impacts diffuse regions. We believe this data provide further insight into effective skin tightening.