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이중모드 마이크로스트립 계단형 임피던스 스터브를 이용한 대역통과 필터
나현식 ( Hyeon Sik Na ),남훈 ( Hun Nam ),김유선 ( Yu Seon Kim ),임영석 ( Yeong Seog Lim ) 전남대학교 전자통신기술연구소 2008 전자통신기술논문지 Vol.11 No.1
본 논문에서는 반 파장 SI헤어핀 공진기에 SI 스터브를 추가하여 이중모드를 발생시키는 공진기를 제안하였다. 공진기의 특성을 파악하기 위해 대칭적인 네트워크에서 Odd모드와 Even모드 여기를 통해서 각 모드의 공진조건을 구하였다 유전율 2.6, tanδ 0.002인 테프론 기판을 사용하여 필터를 제작하였다. 제작된 필터의 크기는 급전선로를 포함하여 36×18×0.78 mm3이다. 제작 측정결과 통과대역에서-1.9 dB의 삽입손실을 보였다.(2.3 GHz~2.48 GHz) In this paper, we propose the structure that is generating dual mode resonance using the step Impedance (SI) hairpin resonator with the SI stubs. To verify the properties of structure and to derive the each mode resonant condition, we apply the conventional even- and odd mode excitation method in the symmetric network. The fabricated filter is used by Teflon substrate with the dielectric constant of 2.6 and tangent loss of 0.002, and it has a size of 36×18×0.78 mm3, which includes a feed line. The measured results of the fabricated filter are shown the -1.9 dB insertion loss at pass band frequencies (2.3 GHz~2.48 GHz).
Induction of Oxidative Stress in the Epididymis of Rats After Subchronic Exposure to Epichlorohydrin
Shin, In-Sik,Lim, Jeong-Hyeon,Kim, Sung-Hwan,Kim, Kang-Hyeon,Park, Na-Hyeong,Bae, Chun-Sik,Kang, Seong-Soo,Moon, Changjong,Kim, Sung-Ho,Jun, Woojin,Kim, Jong-Choon Springer-Verlag 2010 Bulletin of environmental contamination and toxico Vol.84 No.6
( Na Young Kim ),( Jae Hyeon Park ),( Jimyung Park ),( Nakwon Kwak ),( Sun Mi Choi ),( Young Sik Park ),( Chang-Hoon Lee ),( Jaeyoung Cho ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Background Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a standard diagnostic method for mediastinal and hilar lymphadenopathy. Although rare, fatal infectious complications can occur following EBUS-TBNA. However, to date, there is a lack of effective preventive strategies to reduce these complications. We aim to investigate the effect of chlorhexidine mouthrinse on the prevention of microbial contamination during EBUSTBNA. Methods This was a single-center, parallel-group, assessor-blinded randomized controlled trial. We randomly assigned adult participants undergoing EBUS-TBNA using a convex probe to gargle for 1 minute with 100 mL of 0.12% chlorhexidine gluconate before EBUSTBNA or to receive usual care (no chlorhexidine mouthrinse) at a 1:1 ratio. Needle wash samples were collected immediately after completion of the procedure by instilling sterile saline into the used needle. The primary outcome was colony forming unit (CFU) counts in aerobic cultures of the needle wash samples. Secondary outcomes were CFU counts in anaerobic cultures, fever within 24 hours after EBUS-TBNA, and infectious complications within 4 weeks after EBUS-TBNA. Results From January 20, 2021 until June 11, 2021, a total of 112 participants underwent randomization and 106 (51 in the chlorhexidine mouthrinse group and 55 in the usual care group) were included in the analysis. The median CFU counts in aerobic cultures were not different in the two groups (10 CFU/ml vs 20 CFU/ml; p=0.70). There were also no significant differences between the groups in secondary outcomes, including median CFU counts in anaerobic cultures (p=0.41) and fever within 24 hours after EBUS-TBNA (11.8% and 5.6%, p=0.31). There were no infectious complications within 4 weeks after EBUS-TBNA in both groups. Conclusion Chlorhexidine mouthrinse before EBUS-TBNA did not result in a reduction in CFU counts of needle wash samples. (ClinicalTrials. gov number: NCT04718922)
( Na Young Kim ),( Jae Hyeon Park ),( Jimyung Park ),( Nakwon Kwak ),( Sun Mi Choi ),( Young Sik Park ),( Chang-hoon Lee ),( Jaeyoung Cho ) 대한결핵 및 호흡기학회 2021 Tuberculosis and Respiratory Diseases Vol.84 No.4
Background: Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a standard diagnostic method for mediastinal and hilar lymphadenopathy. Although rare, fatal infectious complications can occur following EBUS-TBNA. However, to date, there is a lack of effective preventive strategies to reduce these complications. We started a trial to investigate the effect of chlorhexidine mouthrinse on the prevention of microbial contamination during EBUSTBNA. Methods: This study is a single-center, parallel-group, assessor-blinded randomized controlled trial (RCT). We will enroll 112 adult participants undergoing EBUS-TBNA using a convex probe, and randomly assign them to two groups at a 1:1 ratio. The intervention group will gargle for 1 minute with 100 mL of 0.12% chlorhexidine gluconate before EBUSTBNA, while the control group will have no mouthrinse before the procedure. Immediately after completion of EBUSTBNA on all targeted lesions with an aspiration needle, a needle wash sample will be taken by instilling 5 mL of sterile saline into the used needle. The primary outcome is colony forming unit (CFU) counts in aerobic cultures of the needle wash samples. Secondary outcomes are CFU counts in anaerobic cultures, fever within 24 hours after EBUS-TBNA, and infectious complications within 4 weeks after EBUS-TBNA. Conclusion: This trial was designed as the first RCT to investigate the effect of chlorhexidine mouthrinse on the prevention of microbial contamination during EBUS-TBNA. Results from this trial can provide clinical evidence for a simple, safe, and cost-effective strategy to prevent infectious complications following EBUS-TBNA (ClinicalTrials.gov ID: NCT04718922, registered on 22 January 2021).
Na Sun Hee,Eom Joong Sik,Seo Yu Bin,Park Sun Hee,Kim Young Keun,Song Wonkeun,Lee Eunjung,Kim Sung Ran,Yoo Hyeon Mi,Chun Heekyung,Shin Myoung Jin,Kim Su Hyun,Choi Ji Youn,Cho Nan hyoung,Kim Jin Hwa,Son 대한의학회 2024 Journal of Korean medical science Vol.39 No.18
Background: Catheter-associated urinary tract infections (CAUTIs) account for a large proportion of healthcare-associated infections and have a significant impact on morbidity, length of hospital stay, and mortality. Adherence to the recommended infection prevention practices can effectively reduce the incidence of CAUTIs. This study aimed to assess the characteristics of CAUTIs and the efficacy of prevention programs across hospitals of various sizes. Methods: Intervention programs, including training, surveillance, and monitoring, were implemented. Data on the microorganisms responsible for CAUTIs, urinary catheter utilization ratio, rate of CAUTIs per 1,000 device days, and factors associated with the use of indwelling catheters were collected from 2017 to 2019. The incidence of CAUTIs and associated data were compared between university hospitals and small- and medium-sized hospitals. Results: Thirty-two hospitals participated in the study, including 21 university hospitals and 11 small- and medium-sized hospitals. The microorganisms responsible for CAUTIs and their resistance rates did not differ between the two groups. In the first quarter of 2018, the incidence rate was 2.05 infections/1,000 device-days in university hospitals and 1.44 infections/1,000 device-days in small- and medium-sized hospitals. After implementing interventions, the rate gradually decreased in the first quarter of 2019, with 1.18 infections/1,000 device-days in university hospitals and 0.79 infections/1,000 device-days in small- and medium-sized hospitals. However, by the end of the study, the infection rate increased to 1.74 infections/1,000 device-days in university hospitals and 1.80 infections/1,000 device-days in small- and medium-sized hospitals. Conclusion: We implemented interventions to prevent CAUTIs and evaluated their outcomes. The incidence of these infections decreased in the initial phases of the intervention when adequate support and personnel were present. The rate of these infections may be reduced by implementing active interventions such as consistent monitoring and adherence to guidelines for preventing infections.
( Gye Sik Lee ),( Hyeon Suk Na ) 한국논리학회 2012 論理硏究 Vol.15 No.3
It is demonstrated that there is a simple, canonical way to show the independency of the Friedman-style miniaturization of Kruskal`s theorem with respect to H12-BIa this is done by a non-trivial combination of some well-known, non-trivial previous works concerning directly or indirectly the (proof-theoretic) strength of Kruskal`s theorem.
대용량 실험 데이터 처리를 위한 슈퍼컴퓨팅 리소스 기반 새로운 CERN ALICE 그리드 사이트
유현진(Hyeon-Jin Yu),강형빈(Hyeongbin Kang),나지현(Ji-Hyun Na),신재혁(Jaehyuck Shin),안상언(Sang Un Ahn),이재국(Jae-Kook Lee),안도식(Do-Sik An),홍태영(Taeyoung Hong),윤희준(HeeJun Yoon),노서영(Seo-Young Noh) Korean Institute of Information Scientists and Eng 2024 한국정보과학회 학술발표논문집 Vol.2024 No.6