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최근 개발된 cone beam computed tomography의 흡수선량 및 유효선량 평가
이종녕,한원정,김은경 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.2
Purpose : Cone beam computed tomography (CBCT) provides a lower dose and cost alternative to conventional CT, promising to revolutionize the practice of oral and maxillofacial radiology. The purpose of this study was to evaluate the absorbed and effective doses of Implagraphy and VCT (Vatech Co., Hwasung, Korea) and compare them with those of panoramic radiography. Materials and Methods : Thermoluminescent dosimeter (TLD) chips were placed at 27 sites throughout the layers of Female ART Head and Neck Phantom for dosimetry. Implagraphy, VCT units, and Planmeca Proline XC panoramic unit were used for radiation exposures. Radiation weighted doses and effective doses were measured and calculated using 1990 and 2005 ICRP tissue weighting factors. Results : Effective doses in Sv (ICRP 2005, ICRP 1990) were 90.19, 61.62 for Implagraphy at maxillay molar area, 123.20, 90.02 for Implagraphy at mandibular molar area, 183.55, 139.26 for VCT and 40.92, 27.16 for panoramic radiography. Conclusion : Effective doses for VCT and Implagraphy were only about 2.2 to 4.5 times greater than those for panoramic radiography. VCT and Implagraphy, CBCT machines recently developed in Korea, showed moderately low effective doses.
동적 패널 모형을 이용한 재생에너지 정책의 OECD 국가 재생에너지 보급 효과 분석
김은성 ( Eun Sung Kim ),허은녕 ( Eun Nyeong Heo ) 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2016 자원·환경경제연구 Vol.25 No.2
기후변화 대응 및 에너지 안보를 위해 세계 각국에서는 다양한 재생에너지 보급 정책을 수립, 시행하고 있다. 재생에너지 정책이 재생에너지 확산에 미치는 영향을 분석하는 많은 선행연구들에서는 종속변수로 재생에너지 발전량을 사용하고 있는데 자기상관(autocorrelation) 문제의 발생 가능성에도 불구하고 정태적 모형을 쓰고 있다는 점, 기술채택에 선행되어야 하는 기술혁신의 영향을 고려하지 않았다는 점에서 한계점을 지닌다. 본 연구에서는 동적 패널 모형(dynamic panel model)을 이용하고 기술혁신 변수를 추가함으로써 위의 두 한계점을 극복하고자 하였다. 분석 결과 FIT가 RPS보다 재생에너지 보급에 보다 효과적임을 알 수 있고, 재생에너지 기술혁신 또한 재생에너지 확대에 긍정적으로 기여한다는 사실을 밝혀내었다. 또한 이 결과를 바탕으로 기존 선행연구에서 공통적으로 직관과 어긋난 결과를 도출한 데에는 위의 두 한계점이 원인일 수 있다는 가능성을 확인하였다. To achieve the socially optimum level of renewable generation, governments should design renewable policies to induce renewable technologies competitive with conventional generation technologies. And to do that, it is needed to understand how each policy has been effective in promoting renewables for power sector. In most of the literatures, there are two key limitations that they did not considered autocorrelation problem using the amount of generation from renewables as a dependent variable and technology innovation which needs to be preceded technology adoption. In this study, I try to overcome these two problems by using dynamic panel model and adding an additional variable for technology innovation. According to the result, FIT has been effective rather than RPS in promoting renewables for generation and I found the possibility that the counterintuitive results which commonly appeared in existing studies might be due to the two limitations mentioned above.
국제 유가 변동이 국내 에너지 기업의 주가에 미치는 영향 연구
허은녕(Heo, Eun-Nyeong),김지효(Kim, Ji-Hyo) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
국제 원유 가격의 상승은 국내 주식시장에 어떠한 영향을 끼칠것인가에 대해서는 다양한 의견들이 있다. 에너지기업들에 한정해도 이는 마찬가지이다. 최근의 주식시장을 관찰해보면 급격한 원유가격의 상승에도 불구하고 다른 방향의 결과들을 나타나고 있다. 주가는 다양하고 불확실한 여러 요인들에 의해 영향을 받으며 유가는 그 중 한 요인에 불과하기 때문에, 유가가 주가에 미치는 영향을 분리해서 살펴볼 필요가 있다. 본 연구에서는 2000년 1월 4일부터 2007년 10월 16일까지의 일별 국제 원유 가격과 국내 주요 에너지기업들의 주가 자료를 이용해 시계열 분석을 시도해보았다.
배재형 ( Jae Hyung Bae ),조상래 ( Seong Eun Kim ),정은희 ( Sang Rae Jo ),장은희 ( Eun Hui Jeong ),김성은 ( Eun Hui Jang ),권희녕 ( Hui Nyeong Kwon ),박동엽 ( Dong Yeop Park ),이국천 ( Kuk Cheon Lee ) 한국가축위생학회 2010 韓國家畜衛生學會誌 Vol.33 No.2
Bovine brucellosis, an important zoonosis, is diagnosed with serological tests such as the RBT, TAT using inactivated whole bacterial cells or bacterial lipopolysaccharide (LPS) antigen in Korea. However, a strong cross-reaction between Brucella spp. and Yersinia enterocolitica O9 in these tests has seriously complicated the diagnosis of animal brucellosis because Brucella spp. shares common antigenic determinants with Y. enterocolitica O9 in the smooth LPS region. In this study, Brucella-field strains were isolated from Brucellapositive Hanwoo in Kimhae, Korea and outer membrane protein (omp) which has low cross-reaction with Y. enterocolitica O9 and high immunogenicity was extracted from the field strains Then we compared ELISA using the extract with RBT-TAT. Fifteen field strains were isolated from 47 supramammary-lymph nodes, which were collected from 18 farms. Isolation rate was 32%. Brucella-specific antigen was identified by performing SDS-PAGE or Western blotting on extracted omp with at 0.5% n-lauroylsarcosine One hundred and ninety-two serum-samples were used in the experiment: 142 negative and 50 positive samples verified by RBT-TAT. According to ELISA results, 127 samples were negative and 15 appeared positive among 142 negatives by RBT-TAT, while 42 samples were positive and 8 were negative among 50 positives by RBT-TAT. Therefore, it showed 89.4% of specificity and 84% of sensi-tivity. Through the current experiments, we could set up an ELISA based on the omp which has low cross-reaction and high immunogenicity and concluded that the omp could be a good material for accurate diagnosis of bovine brucellosis.
Eun Jin Kim,Oh Young Lee,Kang Nyeong Lee,Sung Joon Lee,Jae-Young Jang,Jin Woong Cho,Tae-Oh Kim 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.3
Background/AimsProton pump inhibitors (PPIs) are frequently used to treat non-erosive reflux disease (NERD), but their effect is limited. It is not knownwhether a potential alternative, AlbisD, containing ranitidine hydrochloride, sucralfate hydrate, and tripotassium dicitrato bismuthate,is effective and safe in treating NERD. The aim of the study is to evaluate the efficacy and safety of AlbisD compared with omperazolein patients with NERD. MethodsThis was a multicenter, randomized, open-label, parallel-group, non-inferiority comparative study. A total of 126 patients with NERDwere randomly allocated to either AlbisD twice daily or omeprazole 20 mg once daily for 4 weeks from February 2016 to August2016. The study patients had histories of heartburn or regurgitation of moderate severity (> score 2) and a frequency of at least 2episodes per week, and had no mucosal breaks of the esophagus on endoscopy. The primary efficacy variable was complete cure ofheartburn at week 4. Secondary efficacy variables evaluating symptoms of heartburn and acid reflux as well as safety profiles werecompared in the 2 groups at week 2 and 4 after treatment. ResultsA total of 113 patients completed the study (57 and 56 in AlbisD and omeprazole groups, respectively). The proportion of patientswith complete cure of heartburn at week 4 was not significantly different between the AlbisD and omeprazole groups (35.1% vs32.1% respectively, P = 0.740). There were no significant differences between the 2 groups in the any secondary variables includingproportions of days without heartburn or acid reflux over 4 weeks (including daytime and nighttime). Adverse events were similarlyreported in the 2 groups (7 [12.3%] vs 6 [10.7%]), and there were no serious adverse events. ConclusionsThe efficacy and safety of AlibsD in treating NERD patients are not inferior to those of omeprazole. Therefore, AlbisD can be analternative to PPIs for NERD.
유전체 서열의 정렬 기법을 이용한 소스 코드 표절 검사
강은미(Eun-Mi Kang),황미녕(Mi-Nyeong Hwang),조환규(Hwan-Gue Cho) 한국정보과학회 2003 정보과학회 컴퓨팅의 실제 논문지 Vol.9 No.3
The syntactic and semantic characteristics of a computer program can be represented by the keywords sequence extracted from the source code. Therefore the similarity and the difference between two programs can be clearly figured out by comparing the keyword sequences obtained from the given programs. Various methods for measuring the similarity of two different sequences have been intensively studied already in bioinformatics on biological genetic sequence manipulation. In this paper, we propose a new method for measuring the similarity of two different programs and detecting the partial plagiarism by exploiting the sequence alignment techniques. In order to evaluate the performance of the proposed method, we experimented with the actual program codes submitted by 70 students attending a Data Structure course year 2001. The experimental results show that the proposed method is more effective and powerful than the fingerprint method which is the most commonly used for the plagiarism detection. 일반적인 컴퓨터 프로그램의 구성적, 구문적 특징은 소스 코드로부터 추출한 키워드들의 서열로 나타낼 수 있다. 따라서 추출한 키워드의 서열을 비교하면 두 프로그램의 유사성과 상이점에 대해서 잘 파악할 수 있다. 서열의 유사성을 측정하는 여러 가지 방법은 생물학적 유전자 서열을 다루는 생물정보학에서 활발한 연구가 이루어져왔다. 본 논문에서 우리는 두 프로그램간의 유사성을 측정하고서열 정렬 방법을 이용하여 부분 표절 검출을 하는 새로운 방법을 제안한다. 제시한 방법의 성능을 평가하기 위해서, 2001년 자료구조 수업에 참석한 수강생들이 제출한 프로그램을 실험 데이타로 사용하여 표절을 검사하였다. 실험결과는 제안된 기법이 표절 검사에 있어 가장 널리 사용되는 지문법(fingerprint)보다 더 효과적임을 보여 주었다.