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Critical Current Equalization via Neutral Lines in a Transformer-Type SFCL
Hyo-Sang Choi,Yong-Sun Cho IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>In order to increase the capacity of the superconducting fault current limiter (SFCL), serial and parallel connections of the superconducting units are necessary. The resistive-type SFCL with serial and parallel connections has the unbalance of power burden because of the difference of critical current between the superconducting units. The transformer-type SFCL using a neutral line consists of a primary coil and several secondary coils with the superconducting units. Because the neutral line is connected with the secondary coils in the SFCL, it induces the simultaneous quench from compulsive current distribution in the superconducting units. The simultaneous quench enables the power burden between the superconducting units to be distributed equally. The neutral line also induces the equal voltage distribution between the superconducting units due to the equal turn's ratio of the secondary coil. In conclusion, the increase of the capacity in the transformer-type SFCL could be achieved easily through the application of the neutral line between the secondary coils and the superconducting units.</P>
( Sung Jin Lim ),( Ji Hye Lee ),( Jin Hyo Kim ),( Geun Hyoung Choi ),( Nam Jun Cho ),( Byung Jun Park ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.4
BACKGROUND: Garlic (Allium sativum) extract has been allowed as commercial biopesticide material for pesticidal activity in the Environmentally-friendly Agriculture Promotion Act. Nine commercial biopesticides containing A. sativum extract have been marketed in Korea. However, the analytical method of the active substances in these materials has not been studied. METHODS AND RESULTS: Cartridge clean-up method for the determination of dimethyl disulfide(DMDS), diallyl disulfide(DADS), and diallyl trisulfide(DATS) in biopesticides containing A. sativum extract was developed and validated by gas chromatography(GC). The clean-up method was optimized using hydrophilic lipophilic balance (HLB) solid phase extraction(SPE) cartridges for the bioactive sulfides in biopesticides containing A. sativum extract, and the eluate was analyzed to quantify the DMDS, DADS, and DATS using the GC. The developed method was validated, and the LOQ and recovery rates of DMDS,DADS, and DATS were 0.226, 0.063, and 0.051 mg L-1 and 80.6, 84.8, and 73.1%, respectively. From the nine commercial biopesticide samples, contents of DMDS, DADS, and DATS were analyzed using the developed method and results showed <LOQ, <LOQ-113.4, and <LOQ-2.3 mg L-1, respectively. CONCLUSION: The developed method could be used in determining the quality of biopesticides for the manufacture of commercial biopesticides containing A. sativum extract.
Sung Eun Kim,정혜경,Seung Joo Kang,이용찬,Hyo-Joon Yang,Seon-Young Park,Cheol Min Shin,임현철,김지현,Su Youn Nam,Woon Geon Shin,Jae Myung Park,Il Ju Choi,김재규,Miyoung Choi,Korean College of Helicobacter and Upper 대한상부위장관ㆍ헬리코박터학회 2021 Korean Journal of Helicobacter Upper Gastrointesti Vol.21 No.1
Background/Aims: The eradication rate of the first-line standard triple therapy (STT) for Helicobacter pylori (H. pylori) infection has decreased since 2000; therefore, other first-line therapies are required. This study was aimed at investigating the efficacy of bismuth- containing quadruple therapy (PBMT) for first-line H. pylori eradication compared to STT, sequential therapy (SQT), and concomitant therapy (CT). Materials and Methods: The Ovid-MEDLINE, Koreamed, EMBASE, KMBASE, and Cochrane Library databases were searched from January 2008 to July 2018. All identified randomized controlled trials (RCTs) comparing PBMT and non-PBMT for first-line H. pylori eradication therapy were included in the final analysis. Results: A total of 3,653 patients from seven RCTs were enrolled. The pooled eradication rates of PBMT by intention-to-treat (ITT) and per-protocol (PP) analyses were 82.1% (95% CI, 68.2~90.8%) and 88.8% (95% CI, 77.1~94.9%), respectively. However, no statistically significant difference was observed in eradication rates of the 10- or 14-day PBMT as compared to 14-day STT, 10-day SQT, and 10-day CT in ITT and PP analyses. PBMT was significantly higher in adverse events than in the other eradication regimens (RR, 1.64; 95% CI, 1.11~2.44). Considerable heterogeneity in adverse events was observed among studies (χ2=88.7; P<0.001, I2=93%). Conclusions: PBMT can be the first-line treatment for H. pylori eradication in Korea when other first-line options, including STT, SQT, or CT, are unavailable due to their high adverse event rates.
Effects of Early Operation in Patients Who Diagnosed Complicated Parapneumonic Effusion
( Sung Jun Chung ),( Hyo Jun Jang ),( Jee Yea Choi ),( Joonkyung Kim ),( Jun Ho Lee ),( Hyun Lee ),( Dong Won Park ),( Sang-heon Kim ),( Jang Won Sohn ),( Hyuck Kim ),( Ho Joo Yoon ),( Won Sang Chung 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Purpose Thoracic empyema is defined as active suppuration within the pleural space and its treatment is controversial. Recently treatment of empyema is changing observation of empyema formation to early invasive treatment with the operation. This study compared the outcomes of early surgery and delayed surgery Method We retrospectively reviewed 40 patients who underwent surgery for complicated parapneumonic effusion from January of 2013 to May of 2020. The early group was defined as operation with empyema diagnosed within 1 week. Results Among 40 patients, 22 patients received early surgery, and 18 patients received delayed surgery. Stage III empyema was prevalent in the delayed group (27.3% vs 76.9%, p=0.004). Operative time was longer in the delayed group (87.5 vs 132.5 min, p=0.004). Intraoperative blood loss was more in the delayed group (200ml vs 750ml, p=0.009). The hospital stay was longer in the delayed group (18.5 days vs 30.0 days, p<0.001). The complication rate was not different between groups (31.8% vs 33.3%, p=0.919). The mortality rate was no significance between the two groups (4.5% vs 5.6%, p=0.884). Conclusion Delayed surgical treatment make operation difficult. Although inactive infected phase, early surgical treatment did not increase postoperative morbidity and mortality.