• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.41 no.3
• /
• pp.83-92
• /
• 2004

Gene expression profile is numerical data of gene expression level from organism measured on the microarray. Generally, each specific tissue indicates different expression levels in related genes, so that we can classify cancer with gene expression profile. Because not all the genes are related to classification, it is needed to select related genes that is called feature selection. This paper proposes a new gene selection method using forward selection method in regression analysis. This method reduces redundant information in the selected genes to have more efficient classification. We used k-nearest neighbor as a classifier and tested with colon cancer dataset. The results are compared with Pearson's coefficient and Spearman's coefficient methods and the proposed method showed better performance. It showed 90.3% accuracy in classification. The method also successfully applied to lymphoma cancer dataset.

• 한국어정보학회:학술대회논문집
• /
• 2017.10a
• /
• pp.338-339
• /
• 2017

본 논문은 개체명 인식을 위해 CRF 모델을 이용해 분류를 수행했다. 개체명 후보를 개체명으로 식별에서 중의성 문제가 필요하다. 본 논문에서는 이러한 중의성 문제 해결을 위해 학습 셋으로부터 패턴과 형태적 특성을 고려해 개체명 후보를 최대로 선택하고 선택된 개체명 후보의 중의성과 정확도를 높이기 위해 주변의 문맥 자질과 분별 확률 모델인 CRF를 이용해 중의성 문제를 해결한다.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2011.05a
• /
• pp.97-98
• /
• 2011

• Journal of the Korean Chemical Society
• /
• v.29 no.2
• /
• pp.137-143
• /
• 1985

Construction of a liquid membrane type of cupric ion selective electrode and its application to the potentiometric titration have been studied. A liquid ion-exchange membrance was prepared by extracting Cu(II) in aqueous solution into 1-(2-pyridylazo)-2-naphthol/nitrobenzene. A Ag/AgCl internal reference electrode was dipped into the aqueous reference solution of $1.00 {\times} 10^{-3}M\;Cu(NO_3)_2$ buffered with HAc-NaAc buffer solution, which was in contact with the nitrobenzene extract. The electrode showed the nernstian response to Cu(II) in the concentration range from $1.00{\times} 10^{-6}$ to $1.00{\times} 10^{-3}$M. The most suitable ion-exchanger concentration in the liquid membrane was $1.00{\times} 10^{-4}$M. The selectivity coefficients of the electrode for the various metal cations were investigated. The electrode was applied to the potentiometric titration of Cu(II) with EDTA.

• Journal of the Korean association of regional geographers
• /
• v.21 no.3
• /
• pp.569-582
• /
• 2015

This study deals with six spa touristy places to analyze the similarity in image and selection factor recognition through multidimensional scaling method. The result is as following. First, as a result of analysis in the similarity in Image of the 6 touristy Spa places, each "Asan and Onyang" and "Suanbo and Ducksan" form different similar image groups. However, Yoosung does not share the similarity in Image that other Spa places own. Second, as a result of analysis of selection factors in the six touristy spa places, it is found out that there is no big difference in selection factors such as 'spa facility', 'a fee to use', and 'quality of service' in the six spa places. Yet, Onyang, Yoosung, Ducksan, and Suanbo spa reflect high selection factor as 'a recognized spa place' different from Asan and Dogo where the reflection of selection factor is low. Onyang, Yoosung, and Dogo regions reflect high selection factor as a 'Touristy destination' while Asan reflects low selection factor.

• The Journal of Korean Association of Computer Education
• /
• v.17 no.4
• /
• pp.13-21
• /
• 2014

Recently, domestically and abroad, programming education has become more important and this increase has been recognized. And it needs a certain criteria for a selection of programming tools because there are various educational programming tools coming out. Thus, we tried to develop a criteria on the selection of educational programming language for a novice programmer and K12 students and verify its validity. So we established 4 areas and 28 items for selection criteria on educational programming language. Additionally, we carried out delphi survey and analyze for validity verification on selection criteria established. As result of carrying out of these processes, we developed 4 areas of selection criteria. Finally we have chosen 19 selection criteria and excluded 9 criteria items which are not sufficient with validity criteria through delphi survey.

• Journal of the Korean Chemical Society
• /
• v.35 no.2
• /
• pp.128-134
• /
• 1991

Previous matrices of potassium ion selective electrodes are generally based on PVC. In this study, however, the electrode membrane was prepared with polyurethane matrix containing potassium tetraphenyl borate as sensing materials and D-18-Crown-6 and 2-nitrophenyl-n-alkylethers as solvent mediator. The average life time of the K$^+$-selective electrode based on polyurethane was 75 days which is significantly longer than PVC based one. The slope factor in linear dynamic range ($1{\times}10^{-1}\;{\sim}\;1{\times}10^{-4}$ M) was 52 mV/decade. The electrode has been successfully applied to find end point in potentiometric titration of K$^+$ with tetraphenyl borate solution in the sea water, even in the presence of several interfering cations$(NH^{4+},\;Na^{+},\;Li^{+},\;Ca^{2+},\;Mg^{2+},\;Cu^{2+}$).

• KSBB Journal
• /
• v.11 no.1
• /
• pp.100-106
• /
• 1996

The extraction of taxol and baccatin III from the ground needles of Taxus cuspidata were carried out by using supercritical carbon dioxide with and without cosolvents such as ethylacetate and methanol at 300 bar and 313K. Taxol is a promising anticancer agent and baccatin III is a precursor of semisysthesis of taxol. The taxol and baccatin III contents in the extracts were determined by a HPLC. The highest yields of taxol and baccatin III could be obtained by the supercritical extraction with 3wt% methanol and ethylacetate, respectively, as cosolvents. It was also found that the selectivity of taxol and baccatin III were 0.117 and 1.245wt%, respectively, with 0.7wt% ethylacetate, which demonstrated that the selectivity of taxol and baccatin III were increased about 1.8 and 19 times than those of conventional organic solvent extraction.

• Journal of Korea Port Economic Association
• /
• v.32 no.4
• /
• pp.183-192
• /
• 2016

The purpose of this study is to analyze the choice behavior of the mode of transportation for travel from Korea to China. Discrete choice analysis is utilized to establish the factors that affect travelers' choice and to quantify the importance of these factors in transportation mode choices. The proposed choice models were constructed by using stated-preference (SP) data obtained from Chungcheongnam-do. This study also examined different choice behavior in order to capture any previously unobserved differences in the residence area. Results showed that the access time and frequency attributes are the most significant factors, while the travel time attributes are the least significant factors for travelers' choice behaviour. The insights of the results described in this research provide some practical suggestions to transportation providers for planning and strategic management endeavors in the future.

• Korean journal of applied entomology
• /
• v.15 no.2 s.27
• /
• pp.53-56
• /
• 1976

A laboratory experiment was conducted to investigate varietal differences in feeding preference of striped rice borer larvae (Chilo suppressalis W.) to the stem pieces of the eight rice varieties. The preference of the larvae for feeding was significantly differed with the varieties, and in some varieties they were changed with the stages of the plants after transplanting. The larvae much more preferred the susceptible variety Rexoro than the resistant variety TKM-6. The varieties Tongil (Suweon 213-1), Yushin, Jinheung and IR-26 showed comparatively lower feeding preference than TKM-6. Some varieties exhibited a rather interesting phenomenon; strong preference in feeding was observed during the vegetative phase for Tetep and Tongil (Suweon 213-1) and during the maturing phase for Suweon 240 and Yushin. When the varieties TKM-6, Tongil and Rexore were given in several combinations, Rexore was strongly preferred by the larvae than others, and Tongil was still comparatively low in feeding preference of the larvae. The non-feeding preference of the larvae were considered to be in coincidence with the resistance of rice varieties to the striped rice borer.