Search

Tropical and subtropical cyanobacteria have been increasingly reported in temperate regions. The genus Raphidiopsis is rarely observed in South Korea. To date, R. curvispora has been reported generally in tropical and subtropical regions, such as Africa and South-east Asia. R. curvispora strain GIHE-G1 was isolated in a drinking water reservoir in South Korea for the first time in July 2020, and its whole genome was sequenced. The complete genome sequence indicated that the strain did not contain any cyanotoxin genes. Morphologically, the GIHE-G1 strain is more similar to the African than Japanese strain, which has a closer geographical distribution. Phylogenetic analysis of several genetic markers, such as 16S rRNA, phycocyanin intergenic spacer (cpcBA-IGS), nitrogenase gene (nifH) and RNA polymerase gene (rpoC1), did not show geographical characteristics or a close relationship with the African strains, unlike the case of Raphidiopsis raciborskii. Moreover, a minimal genetic relationship with Raphidiopsis from China was found. Considering the morphological and genetic characteristics, R. curvispora strain GIHE-G1 was likely introduced a long time ago or is native to Korea and is becoming more noticeable because of recent environmental changes.

The advent of Web 2.0 and social media is taking a leading role of emerging big data. At the same time, however, informational dysfunction such as infri ngement of one's rights and violation of social order has been increasing sharply. This stu dy, therefore, aims at defining malicious usage, identifying malicious feature, and devising an automated method for classifying them. In particular, the rule-based experiment reveals statisti cally significant performance enhancement. 키워드 : 소셜미디어 마이닝 , 트위터 , 악의적 이용 , 자동분류 Social Media Mining, Twitter, Malicious Usage, Automatic Classification ********************* 본 연구는 2012년 정부(교육과학기술부)의 재원으로 한국연구재단 한국사회과학연구지원사업(SSK)의 지원을 받아 수행된 것임 (NRF-2012-2012S1A3A2033291).연세대학교 문헌정보학과 대학원(andrewevans@yonsei.ac.kr)연세대학교 문헌정보학과 석사과정(moomyungz@naver.com)연세대학교 문헌정보학과 학사과정(hng88@naver.com)연세대학교 문헌정보학과 석사과정(arcoiris@yonsei.ac.kr)연세대학교 문헌정보학과 부교수(min.song@yonsei.ac.kr)논문접수일자: 2013년 1월 15일 최초심사일자 : 2013년 1월 21일 게재확정일자 : 2013년 2월 2일한국문헌정보학회지, 47(1): 269-286, 2013. [http ://dx.doi.org/10. 4275/KSLIS.2013.47.1.269]

Various experiments were conducted to improve durability against SO(2) by impregnating the same amount of vanadium in TiO(2) which had the various physical properties. According to those catalysts, the degree of deactivation by SO(2) had various results, and it was found that the production of unreacted NH(3) in selective catalytic reduction reaction should be low. Based on X-ray photoelectron spectroscopy analysis, O(2) on-off test, O(2) reoxidation test and H(2)-temperature programmed reduction experiment, the redox capacity of catalyst was improved due to increasing of non-stoichiometric compounds. Such a non-stoichiometric oxide and redox capacity of catalyst can be enhanced by the ball-milling process, and the production of ammonium sulfate salt can be more easily inhibited by the superior oxidation-reduction capacity of catalyst. We found that this result is caused by producing and increasing of V(x+) (xor=4), Ti(y+) (yor=3) which are non-stoichiometric chemical species of catalyst.