http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seo, Hwi Won,Park, Changhoon,Han, Kiwon,Chae, Chanhee BioMed Central 2014 Veterinary research Vol.45 No.-
<P>The objective of this study was to evaluate the effect of porcine circovirus type 2 (PCV2) vaccines on PCV2-viremic and -seropositive piglets born from naturally PCV2-infected sows against postnatal PCV2 challenge. The experimental design was aimed at mimicking commercial swine rearing conditions to evaluate the response of the PCV2 vaccine on PCV2-viremic and -seropositive piglets after experimental PCV2 challenge. PCV2a (or 2b)-viremic piglets received a PCV2 vaccine at 21 days of age followed by a PCV2b (or 2a) challenge at 49 days of age (28 days post vaccination). The PCV2 vaccines elicited a high level of humoral (as measured by immunoperoxidase monolayer assay and neutralizing antibody titers) and cellular (as measured by the frequency of PCV2-specific interferon-γ-secreting cells) immune response in the PCV2-viremic piglets after vaccination even in the presence of maternally derived antibodies (MDA). The initial infection of PCV2 in the pigs was not affected by PCV2 vaccination, however the challenging PCV2 was reduced by PCV2 vaccination on PCV2-viremic pigs. The results from this study demonstrate that the PCV2 vaccine used in this study is effective at reducing PCV2 viremia and lymphoid PCV2 DNA, even for PCV2-viremic pigs with passively acquired MDA at the time of vaccination.</P>
Seo, Hwi Won,Han, Kiwon,Kim, Duyeol,Oh, Yeonsu,Kang, Ikjae,Park, Changhoon,Jang, Hyun,Chae, Chanhee American Society for Microbiology 2011 Clinical and vaccine immunology Vol.18 No.7
<B>ABSTRACT</B><P>The objective of the present study was to determine the effect of an inactivated porcine circovirus type 2 (PCV2) vaccine on PCV2b virus shedding in the semen of experimentally infected boars by measuring the immunological response and the PCV2b DNA load in blood and semen. Twelve boars were randomly divided into three groups. The boars in group 1 (<I>n</I>= 4) were immunized with an inactivated PCV2 vaccine and were challenged with PCV2b. The boars in group 2 (<I>n</I>= 4) were only challenged with PCV2b. The boars in group 3 (<I>n</I>= 4) served as negative controls. The number of PCV2 genome copies of PCV2 in the serum and semen were significantly lower in vaccinated challenged boars than in nonvaccinated challenged boars at 7, 10, 14, 21, 32, 35, 42, 49, and 60 days postinoculation. The number of PCV2b genomes in the semen correlated with the number of PCV2b genomes in the blood in both vaccinated challenged (<I>R</I>= 0.714) and nonvaccinated challenged (<I>R</I>= 0.861) boars. The results of the present study demonstrate that the inactivated PCV2 vaccine significantly decreases the amount of PCV2b DNA shedding in semen from vaccinated boars after experimental infection with PCV2b.</P>
Seo, Hwi Won,Han, Kiwon,Oh, Yeonsu,Kang, Ikjae,Park, Changhoon,Joo, Hye Eun,Kim, Sung-Hoon,Lee, Bog-Hieu,Chae, Chanhee Canadian Veterinary Medical Association = Associat 2014 Canadian journal of veterinary research Vol.78 No.3
<P>The objective of the present study was to evaluate polyclonal- and monoclonal-antibody-based immunohistochemical (IHC) tests for the detection of 2 genotypes of Porcine circovirus type 2 (PCV2), a and b, in formalin-fixed, paraffin-embedded lymph-node tissue from pigs with experimental or natural postweaning multisystemic wasting syndrome and to compare the IHC results with those of in-situ hybridization (ISH) assays. The ISH assays proved more sensitive than the IHC tests for the detection of PCV2a and PCV2b. According to these findings, polyclonal-antibody-based IHC testing is the most practical routine diagnostic method for the detection of PCV2 regardless of genotype because IHC testing is less technically complex than ISH testing. However, ISH assays are useful to differentiate between PCV2a and PCV2b in surveillance programs for the monitoring of PCV2 in swine herds.</P>
An Iterative MUSIC-Based DOA Estimation System Using Antenna Direction Control for GNSS Interference
Seo, Seungwoo,Park, Youngbum,Song, Kiwon The Institute of Positioning 2020 Journal of Positioning, Navigation, and Timing Vol.9 No.4
This paper introduces the development of the iterative multiple signal classification (MUSIC)-based direction-of-arrival (DOA) estimation system using a rotator that can control the direction of antenna for the global navigation satellite system (GNSS) interference. The system calculates the spatial spectrum according to the noise eigenvector of all dimensions to measure the number of signals (NOS). Also, to detect the false peak, the system adjusts the array antenna's direction and checks the change's peak angles. The phase delay and gain correction values for system calibration are calculated in consideration of the chamber's structure and the characteristics of radio waves. The developed system estimated DOAs of interferences located about 1km away. The field test results show that the developed system can estimate the DOA without NOS information and detect the false peak even though the inter-element spacing is longer than the half-wavelength of the interference.
Seo, Seungwoo,Park, Junpyo,Suk, Jin-Young,Song, Kiwon The Institute of Positioning 2014 Journal of Positioning, Navigation, and Timing Vol.3 No.2
Time synchronization system using dual frequency bands is designed and the error sources are analyzed for alternative synchronized-pseudolite navigation system (S-PNS) which aims at military application. To resolve near/far problem, dual frequency band operation is proposed instead of pulsing transmission which degrades level of reception. In dual frequency operation H/W delay should be considered to eliminate errors caused by inter-frequency bias (IFB) difference between the receivers of the pseudolites and users. When time synchronization is performed across the sea, multipath error is occurred severely since the elevation angle between pseudolites is low so total reflection can be happened. To investigate the difference of multipath effects according to location, pseudolites are set up coastal area and land area and performances are compared. The error source related with tropospheric delay is becoming dominant source as the coverage of the PNS is broadening. The tropospheric delay is measured by master pseudolite receiver directly using own pseudorange and slave pseudorange. Flight test is performed near coastal area using S-PNS equipped with developed time synchronization system and test results are also presented.
Han, Kiwon,Seo, Hwi Won,Shin, Jeoung Hwa,Oh, Yeonsu,Kang, Ikjae,Park, Changhoon,Chae, Chanhee American Society for Microbiology 2011 CLINICAL AND VACCINE IMMUNOLOGY Vol.18 No.10
<B>ABSTRACT</B><P>The objective of the present study was to compare the effects of the modified live porcine reproductive and respiratory syndrome virus (PRRSV) vaccine (Ingelvac PRRS MLV; Boehringer Ingelheim Animal Health, St. Joseph, MO) on European and North American PRRSV shedding in the semen of experimentally infected boars. The boars were randomly divided into six groups. Vaccinated boars shed the North American PRRSV at the rate of 10<SUP>0.1</SUP>to 10<SUP>1.0</SUP>viral genome copies per ml and 3.63 to 10<SUP>1.1</SUP>50% tissue culture infective doses (TCID50)/ml, respectively, in semen, whereas nonvaccinated boars shed the North American PRRSV at the rate of 10<SUP>0.2</SUP>to 10<SUP>4.7</SUP>viral genome copies per ml and 1.14 to 10<SUP>3.07</SUP>TCID50/ml, respectively, in semen. Vaccinated boars shed the European PRRSV at the rate of 10<SUP>0.1</SUP>to 10<SUP>4.57</SUP>viral genome copies per ml and 1.66 to 10<SUP>3.10</SUP>TCID50/ml, respectively, in semen, whereas nonvaccinated boars shed the European PRRSV at the rate of 10<SUP>0.3</SUP>to 10<SUP>5.14</SUP>viral genome copies per ml and 1.69 to 10<SUP>3.17</SUP>TCID50/ml, respectively, in semen. The number of genomic copies of the European PRRSV in semen samples was not significantly different between vaccinated and nonvaccinated challenged European PRRSV boars. The present study demonstrated that boar vaccination using commercial modified live PRRSV vaccine was able to decrease subsequent shedding of North American PRRSV in semen after challenge but was unable to decrease shedding of European PRRSV in semen after challenge.</P>
서경석(Seo Kyeongseog),이현정(Lee Hyunjeong),정기원(Chong Kiwon) 한국전자거래학회 2006 한국전자거래학회지 Vol.11 No.4
기관에 전사적 아키텍처(Enterprise Architecture, EA)를 도입하고 운영하는데 있어, 조직의 EA 업무 수행 능력을 평가하고, 개선하기 위해 어떤 노력을 해야 하는지 기준이 필요하다. 이러한 요구에 따라 조직의 EA 능력 진단과 개선사항 도출, 개선방안 제시, 향후 투자 방향을 결정하는데 참고가 되는 EA 성숙도 모델을 정의하였다. EA 성숙도 모델은 CMMI의 연속형(continuous) 모델을 참고하여, EA 성숙도를 나타내는 5개의 단계와 EA 평가를 위한 4개 평가영역의 15개 평가요소, 평가요소 별 성숙도 단계를 측정하기 위한 평가기준으로 구성되어 있다. 본 논문에서 제안하는 성숙도 모델은 EA 도입 및 정착에 주안점을 두었으며 범정부 차원의 기관 간 연계/통합으로 협업이 잘 될 수 있도록 정의하였다. When Enterprise Architecture(EA) is defined and applied, it is needed to assess the EA capability, and to identify guides for improvement. According to these needs, this paper presents an enterprise architecture maturity model to assess the EA capability, to identify the details for improving EA, to suggest the guides for improvement, and to support decision-making for investment. The model which refers to the continuous representation of CMMI consists of 5 maturity levels, 4 capability areas including 15 capability elements, and capability indications to make a determination of maturity level by capability elements. The model concentrates on the development/stabilization of EA and the connection/coordination over the federal agencies.