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한상윤,Han, Sang-Yun 대한에이즈예방협회 2009 레드리본 Vol.82 No.-
지난해 개정된 학교보건법 및 교과부 보건교육과정 고시에 따라 오는 3월부터 전국 초등학교 $5{\sim}6$학년, 중고등학교에서 1개 학년씩 17시간 이상 보건교육이 실시된다. 개정된 법에 따라 2010년부터 중고등학교는 보건과목을 선택과목으로 도입해야 한다. 이는 50년 만에 보건교과가 부활됨을 의미한다. 이러한 변화의 배경과 전망에 대한 시평을 의뢰하였다.
한상윤 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.12
Depending on the protonation site, protonated cytosine, i.e., CH+, is known to gain different degrees of stabilization from hydration. To deepen our understanding of the solvation of protonated cytosine at the molecular level, hydrated clusters of protonated cytosine, CH+(H2O)n = 1–6, as a microscopic hydration model, were investigated. Using the hydrated clusters, the stepwise solvation of protonated cytosine molecules protonated at two different sites, N3 and O2, was studied using density functional theory (DFT) calculations (B3LYP/6-311+G(d,p)). N3-protonated cytosine, CNH+, was found to have a stronger interaction with water than O2-protonated cytosine, COH+, by 1 kcal/mol per water solvent. For CNH+, the hydration of four water molecules by hydrogen bonding was shown to account for approximately 75% of the bulk solvation energy, and further hydration with six waters accounts for the majority of the bulk stabilization. However, unlike the case of CNH+, the binding of water to the pyrimidine ring side of COH+ was observed to be fairly repulsive. In addition, the initial stepwise hydration energies for COH+, which were mostly governed by hydrogen bonding, were weaker than those predicted for CNH+. These results suggest that the higher charge density carried by CNH+ favors both hydrogen bonding and ion–dipole interactions, thus resulting in the greater stabilization of CNH + than COH+ in an aqueous environment.
한상윤,Hwan Jin Kim,Tae Kyung Ha 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
We report the construction of a MALDI imaging mass spectrometer equipped with a specially designed laser focusing lens, a compact aspherical singlet lens, that obtains a high-lateral imaging resolution in the microprobe mode. The lens is specially designed to focus the ionization laser (λ = 355 nm) down to a 1 μm diameter with a long working distance of 34.5 mm. With the lens being perpendicular to the sample surface and sharing the optical axis with the ion path, the imaging mass spectrometer achieved an imaging resolution of as good as 5 μm along with a high detection sensitivity of 100 fmol for peptides. The mass resolution was about 900 (m/ Δm) in the linear TOF mode. The high-resolution capability of this instrument will provide a new research opportunity for label-free imaging studies of various samples including tissues and biochips, even for the study at a single cell level in the future.
한상윤,장병탁 한국정보과학회 2002 정보과학회논문지 : 소프트웨어 및 응용 Vol.29 No.4
Text filtering is a task of deciding whether a document has relevance to a specified topic. As Internet and Web becomes wide-spread and the number of documents delivered by e-mail explosively grows the importance of text filtering increases as well. The aim of this paper is to improve the accuracy of text filtering systems by using machine learning techniques. We apply AdaBoost algorithms to the filtering task. An AdaBoost algorithm generates and combines a series of simple hypotheses. Each of the hypotheses decides the relevance of a document to a topic on the basis of whether or not the document includes a certain word. We begin with an existing AdaBoost algorithm which uses weak hypotheses with their output of 1 or -1. Then we extend the algorithm to use weak hypotheses with real-valued outputs which was proposed recently to improve error reduction rates and final filtering performance. Next, we attempt to achieve further improvement in the AdaBoost's performance by first setting weights randomly according to the continuous Poisson distribution, executing AdaBoost, repeating these steps several times, and then combining all the hypotheses learned. This has the effect of mitigating the overfitting problem which may occur when learning from a small number of data. Experiments have been performed on the real document collections used in TREC-8, a well-established text retrieval contest. This dataset includes Financial Times articles from 1992 to 1994. The experimental results show that AdaBoost with real-valued hypotheses outperforms AdaBoost with binary-valued hypotheses, and that AdaBoost iterated with비 회 원 문서 여과 문제 (text filtering)는 어떤 문서가 특정한 주제에 속하는지의 여부를 판별하는 문제이다. 인터넷과 웹이 널리 퍼지고 이메일로 전송되는 문서의 양이 폭발적으로 증가함에 따라 문서 여과의 중요성도 따라서 증가하고 있는 추세이다. 이 논문에서는 새로운 학습 방법인 에이다부스트 학습 방법을 문서 여과 문제에 적용하여 기존의 방법들보다 우수한 분류 결과를 나타내는 문서 여과 시스템을 생성하고자 한다. 에이다 부스트는 간단한 가설의 집합을 생성하고 묶는 기법인데, 이 때 각각의 가설들은 문서가 특정 단어를 포함하고 있는지 검사하여 이에 따라 문서의 적합성을 판별한다. 먼저 최종 여과 시스템을 구성하는 각 가설의 출력이 1 또는 -1이 되는 이진 가설을 사용하는 기존의 에이다부스트 알고리즘에서 출발하여 좀 더 최근에 제안된 확신 정도 (실수값)를 출력하는 가설을 이용하는 에이다부스트 알고리즘을 적용함으로써 오류 감소 속도와 최종 오류율을 개선하고자 하였다. 또 각 데이타에 대한 초기 가중치를 연속 포아송 분포에 따라 임의로 부여하여 여러 번의 부스팅을 수행한 후 그 결과를 결합하는 방법을 사용함으로써 적은 학습 데이타로 인해 발생하는 과도학습의 문제를 완화하고자 하였다. 실험 데이타로는 TREC-8 필터링 트랙 데이타셋을 사용하였다. 이 데이타셋은 1992년도부터 1994년도 사이의 파이낸셜 타임스 기사로 이루어져 있다. 실험 결과, 실수값을 출력하는 가설을 사용했을 때 이진값을 갖는 가설을 사용했을 때 보다 좋은 결과를 보였고 임의 가중치를 사용하여 여러번 부스팅을 하는 방법이 더욱 향상된 성능을 나타내었다. 다른 TREC 참가자들과의 비교결과도 제시한다.
The past, present, and future of traditional medicine education in Korea
한상윤,김희영,임정화,천진홍,권영규,김형우,양기영,채한 한국한의학연구원 2016 Integrative Medicine Research Vol.5 No.2
Korea has kept the heritage of Korean traditional medicine (KM) during the 19th century harsh modernization, and has established a medical system in parallel with Western medicine. The purpose of this study was to review systematically the history and current system for educating highly qualified traditional medical doctors in Korea. KM produces 750 certified medical doctors every year with a 4–7-year curriculum in 12 universities and their affiliated hospitals. There are 22,074 clinicians along with 2474 clinical specialists in eight departments as of 2014. A national licensing examination and continuing medical education for KM are used for maintaining qualifications of KM doctors, and independent organizations are established for the evaluation of educational institutes. KM has thrived to establish an independent and competitive educational system for KM doctors, equivalent to Western medicine, and has regained a pivotal role for public health in Korea. This study would be useful for cultivating traditional medicine and establishing its educational system in the world.