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OFDM system에서 새로운 Doppler effect 보정 기법에 대한 연구
이심석,정창호,강두이,이병섭,Lee, Sim-Seok,Jeong, Chang-Ho,Gang, Du-Lee,Lee, Byeong-Seop 한국위성정보통신학회 2006 한국위성정보통신학회논문지 Vol.1 No.2
OFDM(Orthogonal Frequency Division Multiplexing)방식은 유, 무선 채널에서 고속 데이터 전송에 적합한 방식으로, 최근 활발히 연구되고 있다. 이중 IEEE 802.16에 근거한 WiBro는 OFDM을 핵심기술로 사용하고 있으며, 최근 상용화를 통한 시장 확대를 추진 중에 있다. 이에 따라 가까운 미래에 고속 이동체(KTX, airplane..etc)에서 사용될 경우 OFDM system의 치명적인 단점인 DFS(Doppler Frequency Shift)에 의한 ICI(inter-carrier interference)가 발생할 수 있다. 본문에서는 위성을 통한 OFDM system operating에 있어서 Doppler effects에 대한 새로운 3가지 보상 기법을 제시하고 constellation과 BER curve를 통하여 향상된 성능을 확인한다. ODFM(Orthogonal Frequency Division Multiplexing) technique is suitable for high speed data transfer both in wired/wireless channels, and is actively studied recently. Among them, WiBro based on IEEE 802.16 uses ODFM as its core technology, and is currently trying to expand market through commercialization. Therefore, if it's used for high speed moving object(KTX, airplane..etc) in near future, there is a possibility of ICI(inter-carrier interference) to occur due to DFS(Doppler Frequency Shift), a critical weak point of ODFM System. This study suggests 3 compensation techniques for Doppler effects in ODFM system operating through satellite, and confirms improved performance through constellation and BER curve.
염료감응태양전지의 광학특성분석을 통한 건축창호 적용가능성 평가 연구
심세라(Sim Se-Ra),윤종호(Yoon Jong-Ho),정선영(Jeong Seon-Yeong),백남춘(Baek Nam-Choon) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.3
It can gain both the electric energy production and disperse of light at the same time if DSSC is applied in the building as window system. It means to help facade design and to be used in lighting, heating, cooling energy directly by applicating DSSC BIPV window that is possible to daylighting and materialization of color. For this, optical characteristics analysis that is basic step must take precedence. So, basic databases of DSSC are builded and optical performances according to the double and triple glazing are evaluated by analyzing spectral data of various colored DSSC. As a result, Green④ has the highest visible transmittance that is 28.8%, and Blue③ has the lowest that is 0.3%. And, in case of optical performance of Green④ depending on the incidence angle, SHGC and Tsol are decreased sharply from more than 60°. Finally, It is judged that Red④, Green①, ④, Blue④ are suitable for application in office building because visible transmittance is high and solar heat gain coefficient is low relatively in spite of composing to double and triple glazing.
내과계중환자실에서 인공호흡기관련 폐렴 번들 적용의 효과
유송이(Yoo Song Yi),정재심(Jeong Jae Sim),최상호(Choi Sang Ho),김미나(Kim Mi Na) 한국기초간호학회 2018 Journal of korean biological nursing science Vol.20 No.4
Purpose: The purpose of this study was to confirm the compliance of the application of a ventilator-associated pneumonia bundle and understand its effects on the decrease in the incidence of ventilator-associated pneumonia. Methods: This was a retrospective observational study with history control group design. Subjects were selected from January to June 2014, prior to the intervention using the ventilator-associated pneumonia bundle. Subjects were also selected from October 2014 to March 2015, 3 months after the intervention. The number of subjects was 112 before the intervention, and 107 after the intervention. Results: The number of nurses who followed the bundles increased from 8 out of 29 (27.6%) before the intervention to 19 out of 29 (65.5%) after the intervention (odd ratio=4.99, confidence interval=1.63-15.25, p=.004). There were 3 cases of ventilator-associated pneumonia before the intervention and 1 case after the intervention. The ventilator days were 2,143 days before the intervention and 2,232 days after the intervention. The ventilator-associated pneumonia rate of the 1,000 ventilator days was 1.40 before the intervention and decreased to 0.45 after the intervention. Conclusion: This study is meaningful, as there has been little research conducted regarding the application of the ventilator-associated pneumonia bundle in South Korea.
세라믹 블록을 이용한 다공성 표면복사버너의 실험적 연구
변장희(Jang-Hee Byeon),심윤보(Yoon-Bo Sim),정황희(Hwang-Hee Jeong),윤승호(Seung-Ho Yoon),이기만(Kee-Man Lee) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
본 연구는 표면복사버너인 세라믹 블록 버너의 기초 열성능을 열용량과 당량비에 따라 조사하였다. 세라믹 버너의 화염은 크게 세 가지 모드로 특성을 구별하였으며, 연료가 희박구간에서 나타나는 Blue Flame Mode와 연소반응이 활발한 당량비 0.9부근에서 나타나는 Radiation Mode, 연료과잉 구간에서 나타나는 Pool Flame Mode로 나누어 비교하였다. Blue Flame Mode의 경우 버너표면에서 각각의 홀에 청염이 형성되며, 그로인해 낮은 표면 화염온도와 높은 배기가스 온도를 나타낸다. 이에 비하여 Radiation Mode의 경우 표면이 적열되는 표면연소상태를 보이기 때문에 낮은 배기가스의 온도와 높은 표면화염 온도를 나타낸다. 그로인해 버너표면의 내부에서 완전연소가 이루어져 CO의 배출량은 낮으며, 표면온도의 영향을 받아 NOx의 배출량은 높게 나타난다. Pool Flame Mode의 경우 버너 표면위에 녹색 화염을 형성하며 표면에서 완전연소 되지 못한 미연소가스가 외염을 형성한다. 그로인해 높은 배기가스의 온도와 낮은 표면온도를 갖으며, CO의 배출량 또한 높게 나타난다. 세라믹 버너의 경우 이전연구에 사용된 메탈화이버 버너에 비해 좁은 안정화 영역을 보여준다.
천식과 호산구성 기관지염에서 CD4, CD8 림프구 침윤
이상엽 ( Lee Sang Yeob ),이승룡 ( Lee Seung Lyong ),김제형 ( Kim Je Hyeong ),신철 ( Sin Cheol ),심재정 ( Sim Jae Jeong ),강경호 ( Kang Gyeong Ho ),유세화 ( Yu Se Hwa ),인광호 ( In Gwang Ho ),이지혜 ( Lee Ji Hye ),정운용 ( Jeong U 대한결핵 및 호흡기학회 2003 Tuberculosis and Respiratory Diseases Vol.55 No.5
표세영,김무성,심홍보,이선일,정용태,김수천,심재홍,김정호 인제대학교 2000 仁濟醫學 Vol.21 No.2
Objectives: There are several studies in the literature of the relation between blood group and brain tumor, but some have been poorly designed or have reported findings in such a way that they are difficult to interpret. No explanation has been offered for association, and studies relying on self-reports of blood group failed to confirm associations. Methods and Materials: This report summarizes the distribution of the ABO blood type in 363 patients admitted to our hospital from July, 1998 to December, 1999. Results : The types of tumor are 116 glial tumors, 84 pituitary tumors, 62 meningioma, 51 metastatic tumors, 50 other tumors. In the 363 tumor series, 110 patients were found to be in blood group O, 107 in group A.106 in group B, and 40 in group AB. In the 116 glioma series, 42 patients were found to be in blood group 0. 33 in group B, 29 in group A, and 12 in group AB. In the 62 meningioma series, 28 patients were in blood group B, 18 in group A, 10 in group 0, and 6 in group AB. In the 51 metastatic tumors, 17 patients were found to be in blood group A. 17 in group 0, 11 in group B, and 6 in group AB. In the 84 pituitary tumors, 27 patients were blood group A, 26 in group 0, 23 in group B, 8 in group AB. In 21 the cerebellopontine angle tumors, 5 patients were blood group B, 5 blood group 0, 5 blood group AB, 6 blood group A. The blood group percentages of a series of 363 patients with brain tumors were compared with the distribution of blood types. Statistical analysis was performed using chi-square test. The analyses of blood groups according to the brain tumors and the age groups were not statistical significant. Conclusions: The blood group distributions related to the brain tumors does not indicate the statistical significance. It would be necessary to analyze more abundant cases.