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交流一直流 電力系統의 효과적인 潮流計算을 위한 새로운 方法
정동일,이광우,정형환 東亞大學校 海洋資源硏究所 1993 硏究論文集 Vol.6 No.1
The new method results from a further simplipication of the unified methods. The a. c. systme equations are solved with the d. c. system modelled simple as a real and reactive power injection at the appropriate ferm busbar. For d. c. solution the a. c. system is modelled simply as a constant voltage at the Converter a. c. terminal busbar.
Compass 연산자를 이용한 Edge의 방향정보 표현
이병일,최현주,최흥국,전순미 인제대학교 1998 仁濟論叢 Vol.14 No.1
에지(edge)의 검출은 영상처리를 하기 위한 전처리 단계로서 중요하고도 기초가 되는 부분이다. Compass 기울기 연산자는 방향에 따른 마스크를 사용하여 에지를 검출하여 주는데, 본 논문에서는 이러한 Compass 기울기 연산자를 이용하여 찾아지는 에지를 방향에 따라서 색상을 지정하여 표현함으로써 에지 정보의 방향성을 시 각화하도록 하였다. 예제 이미지는 임의의 타원으로 구성된 실험용 이미지와 다른 하나는 쥐와 운동 신경조직을 현미경으로 확대하여 본 이미지이다. Digital Image Processing is divided into two branches. One is Improvement of Image Information which helps human beings to understand image, and another is Image Data Analysis which helps the machine to have cognizance of image. Edge Detection is indispensable part to apply two branches, for it is basic application. Edge Detection is important and basic preprocess at Image Processing. Edge can be found by Compass operator as direction with 3×3 Masks. Compass operator has 8 element to be compared. Each has an information about direction of an edge. To visualize edge information, We propose the method of edge detection as direction showed by color. First, We had experiment on 4-Direction, then on 8-Direction. 8-Direction 8-Color method was better than 4-Direction 4-Color method, for Compass operator had 8 elements. Result Image shows the color which has direction information.
Cryptosporidium hominis Infection Diagnosed by Real-Time PCR-RFLP
Hyeng-Il Cheun,Kyungjin Kim,Sejoung Yoon,Won-Ja Lee,Woo-Yoon Park,Seobo Sim,Jae-Ran Yu 대한기생충학열대의학회 2013 The Korean Journal of Parasitology Vol.51 No.3
There are approximately 20 known species of the genus Cryptosporidium, and among these, 8 infect immunocompetent or immunocompromised humans. C. hominis and C. parvum most commonly infect humans. Differentiating between them is important for evaluating potential sources of infection. We report here the development of a simple and accurate real-time PCR-based restriction fragment length polymorphism (RFLP) method to distinguish between C. parvum and C. hominis. Using the CP2 gene as the target, we found that both Cryptosporidium species yielded 224 bp products. In the subsequent RFLP method using TaqI, 2 bands (99 and 125 bp) specific to C. hominis were detected. Using this method, we detected C. hominis infection in 1 of 21 patients with diarrhea, suggesting that this method could facilitate the detection of C. hominis infections.
Young-Il Jeong,Hee-Eun Shin,Sang-Eun Lee,Hyeng-Il Cheun,Jung-Won Ju,Jung-Yeon Kim,Mi Yeoun Park,Shin-Hyeong Cho 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.2
Clonorchis sinensis is currently the most important parasite affecting public health problems in the Republic of Korea. We investigated the prevalence of C. sinensis infection among residents living along 5 major rivers in Korea. A total of 42,562 individual stool samples were collected from 37 localities and examined using the formalin-ether sedimentation technique. Helminth eggs were detected in 4,052 (9.5%) residents and 3,586 (8.4%) were infected with C. sinensis. The egg positive rate of C. sinensis in Nakdong, Seomjin, Geum, Yeongsan, and Han River was 11.7%, 9.9%, 6.5%, 3.1%, and 1.0%, respectively. The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females. The age-prevalence was the highest in the 50-59 years band. It has been reconfirmed that the endemicity of clonorchiasis is higher in southern areas of Korea, especially along Nakdong and Seomjin Rivers. A combination of continuous control programs with health education initiatives is urgently required in these highly endemic areas of clonorchiasis in Korea.
CHEUN, Hyeng-Il,CHO, Shin-Hyeong,LIM, Yi-Young,LEE, Byung-Chul,KIM, Jung-Yeon,JU, Jung-Won,NA, Byoung-Kuk,KIMATA, Isao,YU, Jae-Ran,KIM, Tong-Soo Japanese Society of Veterinary Science 2010 The Journal of veterinary medical science Vol.72 No.2
<P>Cryptosporidiosis is a diarrheal illness caused by apicomplexa parasite <I>Cryptosporidium</I> spp. In this study, to examine the overall infection status of <I>Cryptosporidium</I> spp. in individuals residing in southern parts of Korea, eight counties around Yeongsan, Seomjin and Nakdong River valleys was surveyed. The investigation was carried out from April to October 2005. A total of 9,498 stool samples were collected from individuals. Stool samples were analyzed for modified acid-fast stains, and DNA fragment extracted from positive samples was identified by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) for 18S rRNA polymorphic region. Oocysts of <I>Cryptosporidium</I> spp. were detected in 239 specimens (2.5%) by a modified acid-fast stain. Infection rate was not significantly different between male (2.2%) and female (2.8%) individuals examined (<I>P</I>>0.05). In the infection rate by age, totally 1-9 (4.8%) and 80< (3.7%) age group were shown to the highest, and there was shown to significant differences (<I>P</I><0.05). Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis of 18S rRNA gene from 51 isolates showed that all the isolates were identified as <I>C. parvum</I>. Our data collectively suggested that <I>C. parvum</I> infection is prevalent in the studied areas of Korea and more comprehensive nation-wide epidemiological studies are needed to elucidate the infection status of <I>Cryptosporidium</I> infection in Korea.</P>