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배상현(Bae Snag Hyun),이강현(Lee Kang Hyeon) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.11
For FA(factory automation) and ATE(automatic test equipment) in the industrial area, the standard bus needs to increase the system performance of multiprocessor environment. VME(versa module european package format) bus is appropriated to the standard bus but has features of small package and low board density. Beside, the density of board and semiconductor have grown to become significant issues that affect development time, project cost and field diagnostics. To fit this trend, in this paper, we composed Revision C.1(IEEE Std. P1014-1987) of the integrated environment for the main function such as arbitration, interrupt and interface between VMEbuis and several control modules. Also the designed VME system controller is implemented on FPGA that can be located even into Slot 1. The control and function modules are coded with VHDL mid-fixed description method and then those operations are verified by simulation. As a result of experiment, we confirmed the most important that is the operation of Bus timer about Bus error signal should occur within 56%u33B2, and both control and function modules havethe reciprocal operation correctly. Thus, the constructed VHDL library will be able to apply the system based VMEbus and ASIC design.
The error analysis of field size variation in pelvis region by using immobilization device
Kim,Jae-Sung,Kang,No-Hyun,Jang,Ji-Young,Kim,Yong-Eun,Kim,Ki-Hwan,Kim,Jun-Snag,Kim,Dong-Wuk,Cho,Moon-June 대한방사선 방어학회 2000 방사선방어학회지 Vol.25 No.1
방사선치료시 환자자세의 변화에 따라 방사선조사영역이 불일치하게 되어 주변의 정상조직에 불필요한 방사선조사가 생길수 있다. 본 연구에서는 골반부위 방사선 치료환자를 대상으로 Elecrtronic portal imaging device(EPID)로 고정기구를 사용한 방사선조사영역의 영상을 획득하여 고정기구사용에 따른 조사영역변화에 대한 오차를 분석하고자 한다. 충남대학교병원 치료방사선과에서 1998년 8월부터 1999년 8월까지 21명의 골반부위 방사선치료환자를 대상으로 하였다. 환자들은 모두 앙와위자세를 유지하면서 치료를 받았고, 고정기구를 사용하지 않은 11명과 고정기구를 사용한 10명으로 각각 나누어서 연구를 실행하였다. 고정기구는 스티로폼을 이용하였다. 전체 치료과정중 EPID를 이용하여 전면조사시 x(right-left)축, y축으로의 평균이동값은 각각 0.19 mm, 0.48 mm이었고, 계통이동과 우연이동은 평균이동으로부터 표준편차가 x축, y(longitudinal)방향을, 측면조사는 z축(vertical), y축(longitudinal)방향을, 대상으로 영상을 얻었다. 전체 치료과정중 얻은 영상들을 모의치료시 촬영한 기준필름과 matching기법을 이용하여 오차를 측정하였다. 고정기구를 사용하지 않은 11명 환자의 전면 조사영역의 경우 x축, y축으로 각각 2.38 mm, 2.19 mm와 1.92 mm. 1.29 mm이었다. 측면조사영역에서 z축, y축으로의 평균이동갑은 각각 -3.61 mm, 2.07 mm이었고 계통이동과 우연이동은 표준편차가 z축, y축으로 각각 3.20 mm, 2.29 mm와 2.73 mm, 1.62mm이었다. 한편 고정기구를 사용한 10명 환자의 전면 조사영역에서 x축, y축으로의 평균이동값은 각각 0.71 mm, 1.27 mm이었다. 측면조사영역에서 z축, y축으로 각각 1.87 mm, 2.83 mm와 1.68 mm, 1.65 mm이었다. 본 연구에서는 고정기구를 사용한 환자군의 조사영역의 오차는 고정기구를 사용하지 않은 환자구의 조사영역의 오차에 비해 약간 감소됨을 확인할 수 있었다. 그리고 두구룹간의 우연오차는 감소하고 계통오차는 크게 변화하지 않는 경향을 보였다. 그러므로 골반부위 방사선 치료시 고정기구를 사용함으로써 방사선 조사영역에 대한 오차유발의 원인을 줄일 수 있을 것으로 생각된다. In radiotherapy, it may happen to radiate surrounding normal tissue because of inconsistent field size by changing patient opsition during treatment. We are going to analyze errors reduced by using immobilization device with Electonic portalimaging device(EPID) in this study. We had treated the twenty-one patients in pelvic region with 10 MV X-ray from Aug. 1998 to Aug. 1999 at Chungnam National University Hospital. All patients were treated at supine position during treatment. They were separated to two groups, 11 patients without device and 10 patients with immobilization device. We used styrofoam for immobilization device and miasured the errors of anterior direction for x, y axis and lateral direction for z, y axis from simulation film to EPID image using matching technique. For no immobilization device group, the mean deviation values of x axis and y axis are 0.19 mm. 0.48 mm, respectively and the standard deviations of systematic deviation are 2.38 mm, 2.19 mm, repectively and of random deviation for xa axis and y axis are 1.92 mm. 1.29 mm, rewpectively. The mean deviation values of za axis and y axis are -3.61 mm. 2.07 mm, repectively and the standared deviations of systematic deviation are 3.20 mm, 2.29 mm, respectively and of random deviation for z axis are 2.73 mm. 1.62 mm, respectively. For immobilization device group, the mean deviation values of x axis and y axis are 1.56 mm. 1.27 mm, respectively. The mean deviation values of z axis and y axis are -1.76 mm. 1.08 mm, repectively and the standard deviations of systematic deviation are 1.87 mm, 2.83 mm, respectively and of random deviation for x axis and y axis are 1.68 mm, 1.65 mm, respectively. Because of reducing random and systematic error using immobilization device, we had obtained gooe reproducibility of patient setup during treatment so that we recommend the use of immobilization device in pelvic region of radiation treatment.
송아지 설사분변으로부터 Shiga toxin-producing Escherichia coli 의 분리 및 특성규명
임금기,강문일,김상기,남경우,박현주,박진량,조경오,이봉주,Lim, Keum-Gi,Kang, Mun-Il,Kim, Snag-Ki,Nam, Kyung-Woo,Park, Hyun-Joo,Park, Jin- Ryang,Cho, Kyoung-Oh,Lee, Bong-Joo 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.2
Shiga toxin (stx) producing Escherichia coli (STEC) causes various clinical signs in animal and human. In this study, 255 fecal samples from calves showing diarrhea were collected from cattle farms in Chonnam province during the period from January 2005 to July 2005. Twenty six STEC (10%) were isolated from 255 fecal samples by PCR. The isolates displayed three different stx combinations (stx1 [69%], stx1 and stx2 [15%], and stx2 [38%]). The isolates were further studied for virulence associated genes and antimicrobial resistance to define the virulence properties. Intimin (eaeA), enterohemolysin (hlyA), and lipopolysaccharide (rfbE) virulence genes were detected in 6 (23%), 7 (26%), and 1 (3.8%) of the isolates, respectively, by PCR. One isolate possessing rfbE gene was typed as E. coli 0157 : H7 by agglutination test with O and H antisera. All 26 isolates showed susceptibility to amikacin (100%) and the majority of isolates showed high susceptibility to gentamicin (88.5%) and chloramphenicol (73.1%). But all isolates were resistant to penicillin. These results may provide the basic knowledge to establish strategies for the treatment and prevention of enteric disease in calves.
망간산화물에 의한 1-Naphthol의 산화-결합 반응에 따른 반응산물 연구
임동민(Dong Min Lim),이두희(Doo Hee Lee),강기훈(Ki Hoon Kang),신현상(Hyun Snag Shin) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.9
본 연구에서는 망간산화물 존재 하에서의 1-naphthol(1-NP)의 산화-결합반응을 통한 변환반응과 반응산물을 조사하였다. 변환반응에 의해 생성된 반응산물을 대상으로 한 용매 추출과 HPLC, GC/MS, LC/MS 및 UV-Vis. 흡광특성 분석 등을 통해 반응산물의 분자 구조특성을 규명하였다. 반응 상등액에서 검출된 반응산물은 모두 1-NP에 비하여 높은 극성을 보였다. 주요 반응산물로는 1,4-naphthoquinon(1,4-NPQ)와 dimer, trimer 등의 소 중합체(oligomers)를 포함하며 특히, 용매추출(CH₂Cl₂) 후 수용액에 잔류하는 친수성 형태의 반응산물은 다양한 분자량의(m/z = 400∼2000) 중합체로서 토양 휴믹물질(풀빅산)과 유사한 형태의 UV-Vis 흡광특성을 보였다. 또한, 비 반응성 생성물인 1,4-NPQ는 1-NP 존재 하에서 망간산화물에 의한 교차-결합(cross-coupling)을 통해 중합체로 변환될 수 있음을 확인하였다. 본 실험조건(20.5 mg/L, 1-NP, 2.5 g/L MnO₂, pH 5)에서 산화-결합 반응에 의한 중합체 형성으로 제거되는 1-NP의 양(mg/L)은 초기농도 대비 약 83%에 해당하며, 이들 중 약 30% 정도는 침전층에서 증류수와 메탄올(CH₃OH)에 의해 추출되지 않는 안정화된 형태의 불용성 중합체 생성물로 존재하였다. 이상의 결과는 망간산화물에 의한 산화-결합반응이 naphthol 오염토양의 처리에 있어서 소 중합체와 중합체 침전물로의 변환을 통한 오염 저감 및 제거 효과를 나타냄을 제시한다. In this study, abiotic transformation of 1-naphthol(1-NP) via oxidative-coupling reaction and its reaction products were investigated in the presence of Mn oxides. The reaction products were characterized for their relative polarity using solvent extraction experiment and reverse-phase HPLC, and for structure using GC/MS and LC/MS, and for absorption characteristics using UV-Vis spectrometry. The reaction products present in aqueous phase were more polar than parent naphthol and comprised of 1,4-naphthoquinon(1,4-NPQ) and oligomers such as dimers and trimers. Hydrophilic component present in water phase after solvent(CH₂Cl₂) extractions was identified as naphthol polymerized products having molecular weight(m/z) ranging from 400 to 2,000, and showed similar UV-Vis. absorption characteristics to that of soil fulvic acid. Transformation of 1,4-NPQ, which is non-reactive to Mn oxide, to the polymerized products via cross-coupling reaction in the presence of 1-NP was also verified. In this experimental conditions(20.5 mg/L, 1-NP, 2.5 g/L MnO₂, pH 5), the transformation of 1-NP into the oligomers and polymerized products were about 83% of initial 1-NP concentrations, and more than 30% of the reaction products was estimated to be water insoluble fractions, not extracted by H₂O and methanol. Results from this study suggest that Mn oxide-mediated treatment of naphthol contaminated soils can achieve risk reduction through the formation of oligomers and polymer precipitation.
영구자석형 다자유도 구형전동기의 토크특성 분석과 효율 향상에 대한 연구
이호준(Ho-Joon Lee),김용(Yong Kim),장익상(Ik-Snag Jang),박현종(Hyun-Jong Park),강동우(Dong-Woo Kang),원성홍(Sung-Hong Won),이주(Ju Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.1
A surfaced permanent magnet spherical motor is capable of operating as three degree of freedom that used for the joints of the robot"s arm, leg, and eyes. Ongoing research like new concept is essential part of motor field, it will make a great contribution in the future the overall portion of the motor, is becoming expected. The author analysis torque characteristics in spherical motor with state of rotating and positioning. And future design direction is smaller motors with equivalent or higher output. Solutions as torque and efficiency improvements are selecting the core with special processing type like powder metallurgy materials. Their special characteristic is high permeability and low eddy current losses at high speed, so improved the torque and efficiency.