http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
만성치주염 환자에 대한 저용량 독시싸이클린의 임상적 효과
김윤식,백정원,김창성,최성호,김종관,Kim, Yoon-Sik,Paik, Jeong-Won,Kim, Chang-Sung,Choi, Seong-Ho,Kim, Chong-Kwan 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.2
Periodontal disease is a complex infectious disease caused by bacteria in the oral mucosa, which results in gingival inflammation, breakdown of periodontal tissues, bone resorption, and finally tooth loss. Mechanical plaque control methods-scaling and root planing are effective methods to stop the progression of such periodontal disease. It was reported that subantimicrobial dose of doxycycline(SDD) regimen could improve clinical conditions of periodontal tissues without causing the overgrowth of opportunistic organisms that was a typical antibiotic side effect. Therefore pharmacological therapy, used in conjunction with mechanical therapy could be considered a useful treatment modality in the treatment of chronic periodontal disease. In this study, 30 patients diagnosed as moderate to advanced chronic periodontitis were divided into 2 groups. In this double-blind, placebo-controlled study, the patients were administered 20mg doxycycline capsule or placebo capsule b.i.d. for 4months, after scaling and root planing. Clinical parameters-bleeding on probing, pocket depth and clinical attachment level were compared and evaluated between these groups at periods of first visit, 1 month, 2 months, 3 months, 4 months. The results were as follows ; 1. In case of moderate periodontitis, pocket depth showed significant reduction after treatment in both the control & experiment groups, when compared with the baseline values(p<0.01), but in case of advanced periodontitis, only the experiment group showed significant reduction after treatment when compared with the baseline values(p<0.05). Statistically significant reduction in pocket depth was observed in the experiment group compared to the control group(p<0.05). 2. In case of moderate periodontitis, clinical attachment level showed significant reduction after treatment in both the control & experiment groups, when compared with the baseline values(p<0.01), but in case of advanced periodontitis, only the experiment group showed significant reduction after treatment when compared with the baseline values(p<0.05). Statistically significant reduction in clinical attachment level was observed in the experiment group compared to the control group(p<0.05). 3. Bleeding on probing improved after treatment in both the groups. In case of moderate periodontitis, the experiment group showed statistically significant reduction of bleeding on probing when compared with the control group at 1 and 4 months after treatment(p<0.05). In case of advanced periodontitis, treatment resulted in statistically significant reduction of bleeding on probing in both the groups(p<0.05). These results indicate that the use of subantimicrobial dose of doxycycline is a useful supplement to mechanical treatment for periodontal patients in ameliorating the clinical parameters such as periodontal pocket, attachment level, and bleeding on probing.
OFDM 시스템에서 기억성을 갖는 비선형 왜곡의 보상을 위한 참조 테이블 기반의 사전왜곡기
김윤식,신요안,임성빈,문용,Kim, Young-Sik,Shin, Yoan,Im, Sungbin,Moon, Yong 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.6
본 논문에서는 OFDM 시스템의 송신기에서 사용되는 선형 필터와 고출력 증폭기의 결합에 의한 \"기억성을 갖는 비선형 왜곡\"을 실제 하드웨어 구현에 적합하게 적은 계산량으로 보상할 수 있는 참조 테이블(look up table; LUT) 기반의 사전왜곡기를 제안한다. LUT를 이용하는 사전왜곡기들은 이미 많이 연구되었으나, 본 논문에서는 다중 입력/단일 출력 형태의 기억성을 갖는 비선형 왜곡을 작은 크기의 LUT를 이용하여 효율적으로 보상한다는 점에서 큰 차이가 있다. 제안 방법에서는 먼저 기억성이 없는 고출력 증폭기만이 존재할 때의 사전왜곡기를 우리가 이미 제안한 고정점 반복 사전왜곡기 알고리즘에 기반하여 LUT로 구현하고, 여기에 선형 역 시스템을 결합하여 기억성을 갖는 비선형 왜곡을 보상한다. 실제 구현 가능성 검토를 위해 제안된 사전왜곡기와 16-QAM, 256-IFFT/FFT OFDM 시스템 기저대역 모뎀을 TMS320C30 DSP를 이용하여 구현하였으며, 실험 결과 작은 크기의 LUT를 이용하여도 원래의 고정점 반복 사전왜곡기에 비해 매우 적은 계산량을 요구하면서 동일한 성능을 얻을 수 있음을 확인하였다.있음을 확인하였다.
H. pylori 감염 진단 시 <sup>14</sup>C-요소호기검사의 임상적 유용성
김윤식,Kim, Yoon-Sik 대한임상검사과학회 2007 대한임상검사과학회지(KJCLS) Vol.39 No.3
Helicobacter pylori (H. pylori) infection is common in korea and high incidence at gastric ulcer and duodenal ulcer. $^{14}C-urea$ breath test ($^{14}C-UBT$) is regarded as a highly reliable and non-invasive method for the diagnosis of H. pylori infection. The purpose of this study was to evaluate the diagnositc performance of a new and rapid $^{14}C-UBT$, which was equipped with Geiger-Muller counter and compared the results with those obtained by gastroduodenoscopic biopsies (GBx). One hundred sixty-eight patients (M : F = 118 : 50) underwent $^{14}C-UBT$, rapid urease test (CLO test), and GBx. The results of $^{14}C-UBT$ were classified as positive (>50 cpm), borderline (25<p<50 cpm), or negative (<25 cpm) and CLO tests were classified as positive or negative according to color change. The results of GBx on giemsa stain were distribution of H. pylori by the Wyatt method. We compared $^{14}C-UBT$ or CLO test results with GBx as a glod standard. In the assessment of the presence of H. pylori infection, the $^{14}C-UBT$ global performance yielded positive predictive value, negative predictive value and accuracy of 93.3% and 83.3%, respectively. However, the CLO test had performance yielded positive predictive value, negative predictive value and accuracy of 76.9%, 50.0%, respectively. In this study $^{14}C-UBT$ is a highly accurate, simple and non-invasive method or the diagnosis of follow up H. pylori infection.
임신 초기 임신양상에 따른 혈청 β-hCG의 결과 예측에 의한 희석배수 참고치 설정
김윤식,신장용,서영미,유신수,Kim, Yoon Sik,Shin, Jang Yong,Seo, Yeong Mi,Yoo, Shin Soo 대한임상검사과학회 2004 대한임상검사과학회지(KJCLS) Vol.36 No.2
This study was carried out to predict the value of serum ${\beta}$ subunit of humans chorionic gonadotropin(${\beta}$- hCG) in early pregnancy viability. This was performed among 85 women in vitro fertilization and embryo transfer(IVF-ET). The serum ${\beta}$-hCG levels were established for 30 normal singleton pregnancies, 10 twin and triplet pregnancies, 10 preclinical abortions, 10 clinical abortions, 20 biochemical abortions and 5 ectopic pregnancies. In comparison to normal singleton pregnancies, multiple pregnancies showed higher ${\beta}$-hCG. But clinical abortions, preclinical abortions and ectopic pregnancies showed lower ${\beta}$-hCG levels than singleton pregnancies. In conclusion, if we predict the value of serum ${\beta}$-hCG of variable early pregnancies and analyze it, we could predict the dilution protocol. Also, it can be useful in other ways.
병렬 컨버터에 의한 스위치모드 승압 정류기의 효율 개선
김윤식,김성환,오세진,이성근,전내석,Kim Yoon Sik,Kim Seong Hwan,Oh Sae Gin,Lee Sung Geun,Jeon Nae Sock 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.2
A new technique for improving the efficiency of single-Phase high-frequency switch-mode boost rectifiers is proposed. This rectifier includes an additional boost converter that parallels the main high-frequency switching device. The additional converter. which is controlled at lower frequencies. bypasses most of the current in the main switch and the high frequency switching loss is greatly reduced accordingly. The rectifier works cooperatively in high efficiency and as if it were a conventional rectifier with one switching device. The proposed scheme is verified by computer simulation using software PSIM.
Microwave Oven용 마그네트론의 전력제어에 관한 연구
김윤식,김종수,이성근,Kim Yoon-Sik,Kim Jong-Soo,Lee Sung-Gun 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
This paper describes a output power control of magnetron for microwave oven. Magnetron is used extensively in household microwave oven and industrial microwave heating devices it is operated by 3000[V]~5000[V] dc high voltage. Power supply for driving magnetron is consisted of a bridge rectifier. HB(half bridge) inverter, full wave rectifier and gate drive circuit. In proposed system. we confirm that line input power can be controlled extensively and linearly to 24.56[%] by change of duty ratio of inverter through a experiment.