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전문 실습장내의 작업환경소음으로 인한 PSIL 개선에 관한 연구
이종길,배영덕 안동대학교 환경연구소 2001 환경연구 Vol.1 No.-
This research is to investigate of PSIL improvement caused by the work environmental noise at the integrated mechanical laboratory of the technical high school. J technical high school was selected as an analytical place and the noise level was measured. To make a normal speech communication between teacher and student at the distance of 5ft, environmental noise level have to be attenuated about 10∼20dBA. To improve PSIL, barrier can be installed at the distance of 1.5m from the noise source and 1.2m above the ground.
Geometric Image Compensation Method for a Portable Projector Based on Prewarping Using 2D Homography
( Jinsoo Cho ),( Jongkil Won ),( Jongwoo Bae ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.9
As portable multimedia devices become more popular and smaller, the use of portable projectors is also rapidly increasing. However, when portable projectors are used in mobile environments in which a dedicated planar screen is not available, the problem of geometric distortion of the projected image often arises. In this paper, we present a geometric image compensation method for portable projectors to compensate for geometric distortions of images projected on various types of planar or nonplanar projection surfaces. The proposed method is based on extraction of the two-dimensional (2D) geometric information of a projection area, setting of the compensation area, and prewarping using 2D homography. The experimental results show that the proposed method allows effective compensation for waved and arbitrarily shaped projection areas, as well as tilted and bent surfaces that are often found in the mobile environment. Furthermore, the proposed method is more computationally efficient than conventional image compensation methods that use 3D geometric information.
복태훈(Tae-Hoon Bok),김주호(Juho Kim),이종현(Chong-Hyun Lee),배진호(Jinho Bae),팽동국(Dong-Guk Paeng),방익찬(Ig Chan Pang),이종길(Jongkil Lee) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.1
해양에서의 음속은 수온, 염분, 압력에 의한 실험식으로 계산되며 해양에서의 평균 염분은 약 34 psu(practical salinity unit)로 수심이나 수평 거리에 따른 변화가 대부분 수 psu 이하이기 때문에 음속에 크게 영향을 미치지 못한다. 그러나 최근 여름철에 중국 양쯔강 범람에 의해서 24 psu 정도의 저염수가 제주 서부 해역으로 유입되는 사례가 발생하고 있으며 이 저염수는 음속에 영향을 미친다. 본 논문에서는 이러한 환경 변화가 수중통신에 미치는 영향을 분석하였다. 즉, 저염수로 인한 음속구조의 변화를 계산하였고, 저염수층 내에서 송수신 수심과 전달거리를 바꿔가며 음파 전달 경로를 모의하여 통신 채널을 추정하였으며, BPSK(Binary phase shift key) 변조방식을 이용하여 비트 오류율을 계산하였다. 동일한 실험 조건하에 저염수가 없는경우의 성능을 비교하여, 저염수가 통신 성능에 어떠한 영향을 미치는가에 대해 분석하였다. 저염수는 수심 약 20 m까지의 표층부에서 음속의 기울기를 양의 기울기로 변화시켜 음파 채널을 형성하였고, 표층부에서 대부분의 송수신 신호의 비트 오류율을 감소시키는 경향을 확인하였다. 본 논문의 저염수에 의한 수중 통신 성능에 미치는 영향을 분석한 결과는 정확한 해양 통신 및 탐지 성능분석을 하기 위해서는 해양환경의 변화를 고려하는 것이 매우 중요하다는 것을 시사한다. The sound speed of seawater can be calculated by the empirical formula as a function of temperature, salinity and pressure. It is little affected by salinity because the average salinity is 34 psu and varies within a few psu seasonally and spatially in the ocean. Recently, low-salinity water of 24 psu flows into the western sea area of Jeju Island due to the flood of the Yangtze River in China during summer, affecting sound speed profile. In this paper, it was analyzed how environmental changes affected to the underwater communication - the sound speed of low-salinity water was calculated, and the communication channel was estimated by the simulated acoustic rays while the transmitting and receiving depth and the range were varied with and without the low-salinity layer. And The BER (Bit error rate) was calculated by BPSK(Binary phase shift key) modulation and the effects of the low-salinity water on the BER was investigated. The sound speed profile was changed to have positive slope by the low-salinity layer at the sub-surface up to 20 m of depth, forming acoustic wave propagation channel at the sub-surface resulting in the decrease of most of the BER. Consequently, this paper suggests that it is important to consider changes of the ocean environment for correctly analyzing the underwater communication and the detection capability.
Frankincense ameliorates endometriosis via inducing apoptosis and reducing adhesion
Min Kyoung Cho,Jung-Sook Jin,Yunju Jo,Jung Ho Han,Su Shin,Sung-Jin Bae,Dongryeol Ryu,Jongkil Joo,Jang-Kyung Park,Ki-Tae Ha 한국한의학연구원 2023 Integrative Medicine Research Vol.12 No.2
Background: Frankincense, a resin derived from trees of the Boswellia genus, has been used as an incense and a type of herbal medicine for treating inflammatory diseases such arthritis, chronic bowel illness, and asthma. While endometriosis is a well-known inflammatory gynecological illness caused by the ectopic attachment and development of uterine tissue over the menstrual cycle, the impact of frankincense on this illness is poorly understood. The purpose of this study was to explore the effects of frankincense on endometriosis. Methods: We used a network pharmacological assessment, in vitro and in vivo investigations with a human endometriotic cell line as well as a syngeneic uterine transfer mouse model. High-performance liquid chromatographic analysis was used to compare water-extracted frankincense (Fr) to its reference compounds and validate the sample. Results: A network pharmacological analysis suggested a positive effect of Fr on endometriosis. Fr relieved endometriosis by reducing ectopic endometrial adherence and development, according to both in vivo and in vitro models. We suggested that the ER stress/p53-apoptosis and chemokine-migration/adhesion pathways underlie Fr's anti-endometriotic action using RNA sequencing and bioinformatic analysis. Conclusion: This study revealed the potential effect of Fr on endometriosis using an experimental investigation. Fr may have the potential to be an effective and safe treatment for endometriosis.