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Distribution of Human Rotavirus Genotypes in a Tertiary Hospital, Seoul, Korea During 2009-2013
한태희,박상훈,정주영,황응수 대한소아감염학회 2015 Pediatric Infection and Vaccine Vol.22 No.2
Purpose: Group A rotavirus (RV) is most common etiologic agent of acute gastroenteritis (AGE) in children worldwide. Recently, vaccination has been introduced in several countries to reduce the disease burden caused by RV infections, but continuous surveillance of RV strains is necessary to detect the emergence of potential variants induced by vaccine-immune pressure. This study aimed to investigate the changing pattern of RV genotypes in children with AGE, following the introduction of vaccination in Korea. Methods: Genotyping of RVs by RT-PCR on the basis of VP7 and VP4 gene segment sequence was carried out on 201 rotavirus-positive stool samples, from children hospitalized with AGE between August 2009 and June 2013. We have directly sequenced PCR products and analyzed the phylogenetic tree. Results: The most prevalent G genotype was G9 (33.3%), followed by G1 (22.4%), G3 (15.9%), G2 (6.0%), G4 (3.0%), G10 (1.5%), and mixed G-type (15.4%), with some nontypeable cases (2.5%). The detected P genotypes were P[4] (45.3%), P[8] (43.8%), mixed P-type (10.4 %), and P[2] (0.5%). The G9P[4] genotype was predominantly observed in hospitalized cases in Seoul in 2010/2011, however G1P[8] has been re-emerged as the predominant genotype in the following season (P =0.004). Conclusions: It seems that the periodic fluctuation in predominance of the G1, G3, and G9 strains occurred in Korea during 2009-2013, following the introduction of RV vaccination.
변압기 권선을 이용한 자속구속형 초전도 전류제한기의 전류제한 특성 분석
한태희,임성훈,Han, Tae-Hee,Lim, Sung-Hun 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
The fault current limiting characteristics of the flux-lock type superconducting fault current limiter (SFCL) using a transformer winding were investigated. The suggested flux-lock type SFCL consists of two parallel connected coils on an iron core and the transformer winding connected in series with one of two coils. In this SFCL, the high-TC superconducting (HTSC) element was connected with the secondary side of the transformer. The short-circuit experimental devices to analyze the fault current limiting characteristics of the flux-lock type SFCL using the transformer winding were constructed. Through the short-circuit tests, the flux-lock type SFCL using transformer winding was shown to perform more effective fault current limiting operation compared to the previous flux-lock type SFCL without the transformer winding from the viewpoint of the quench occurrence and the recovery time of the HTSC element.
자속구속형 초전도전류제한기의 권선비 변화에 따른 전류제한 및 전압강하 보상 특성
한태희,임성훈,Han, Tae-Hee,Lim, Sung-Hun 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.5
In this paper, we investigated the fault current limiting and the load voltage sag suppressing characteristics of the flux-lock type SFCL, designed with the additive polarity winding, according to the variations of turn number's ratio and the comparative analysis between the resistive type and the flux-lock type SFCLs were performed as well. From the analysis for the short-circuit tests, the flux-lock type SFCL designed with the larger turn number's ratio was shown to perform more effective fault current limiting and load voltage sag suppressing operations compared to the flux-lock type SFCL designed with the lower turn number's ratio through the fast quench occurrence of the high-$T_C$ superconducting (HTSC) element comprising the flux-lock type SFCL. In addition, the recovery time of the flux-lock type SFCL after the fault removed could be confirmed to be shorter in case of the flux-lock type SFCL designed with the lower turn number ratio.
피크전류제한 기능을 갖는 초전도한류기의 전류제한 특성분석
한태희,임성훈,Han, Tae-Hee,Lim, Sung-Hun 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.1
The superconducting fault current limiter (SFCL) with a peak current limiting function according to the initial fault current with the different amplitudes was suggested. The proposed SFCL, which consists of two limiting components, causes only the first superconducting element among two limiting components to be quenched in case that the initial fault current with the lower peak amplitude happens. On the other hand, the initial fault current with the higher peak amplitude makes both the superconducting elements of two limiting components to be quenched, which contributes to the peak current limiting function of the SFCL. To confirm the fault current limiting operation of the proposed SFCL, the short-circuit tests of the SFCL according to the fault angle were carried out and its effective fault current limiting operations could be discussed.
한태희,임성훈,고석철,이병준 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
The current limiting characteristics of the flux-lock type superconducting fault currentlimiter (SFCL) using series connected two coils with twice triggering operation, which consists ofseries connected two coils and two superconducting (SC) modules with the inserting resistance, wasanalyzed. The feature of the suggested SFCL is that it can limit the fault current by triggering eitherone SC module or two SC modules comprising the SFCL depending on the amplitude of the faultcurrent. To verify the current limiting operation of the suggested SFCL, the short-circuits in the faultlocation with the different fault currents were tested and its useful operations were described throughthe analysis on the tested results.