• The Korean Journal of Mycology
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• v.40 no.4
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• pp.204-209
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• 2012

In this study, a novel yeast, Y111-5 for Makgeolli manufacture was selected from Nuruk yeasts, and its optimal culture condition were investigated. The Y111-5 strain was identified as Saccharomyces cerevisiae by phylogenetic analysis of 18S RNA sequence. The maximal growth was obtained when the yeast was cultivated at $30^{\circ}C$ for 15 h in the medium containing sucrose 9% and yeast extract 5%.

• The Korean Journal of Mycology
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• v.42 no.4
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• pp.333-340
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• 2014

The aim of this study was to isolate a potential multifunctional biocontrol agent from bacteria for control of multiple plant diseases as an alternative to fungicides. A total of 201 strains were isolated from soil undamaged by repeated cultivation in Sunchang and their ability to produce antibiotics, siderophores and extracellular enzymes such as protease, cellulase and amylase was investigated. Selected strain SCS3 produced cellulose, protease and amylase. This strain also produced siderophores and showed excellent antifungal activity against various phytopathogens. SCS3 was identified as Bacillus subtilis using 16S rRNA sequencing, and named Bacillus subtilis SCS3. Finally, physiological and biochemical characteristics of B. subtilis SCS3 were examined. From the results, B. subtilis SCS3 was found to be a useful multifunctional biocontrol agent against various phytopathogens.

• Korean Journal of Microbiology
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• v.45 no.2
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• pp.140-147
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• 2009

In this study, anaerobic enrichment cultivation was performed with the sediments from the Gimpo and Inchon areas. Lactate as an electron donor and PCE as an electron acceptor was injected into the serum bottle with an anaerobic medium. After the incubation of 8 weeks, the reductive dechlorination of PCE was observed in 7 sites among 16 sites (43%). Three enrichment cultures showed completely dechlorination of PCE to ethene, while four enrichment culture showed transformation of PCE to cis-DCE. The bacterial community structure was analyzed by PCR-DGGE. Dechlorinating bacteria were detected by species-specific primers. The dominant species in seven anaerobic enrichments were found to belong to the genus of Dehalococcoides sp. and Geobacter sp., and Dehalobacter sp.

• (The) Korean Journal of Educational Psychology
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• v.22 no.2
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• pp.367-384
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• 2008

The purpose of this study was to develop picture testing instrument for measuring children's causal reasoning ability on events that can occur in daily life. The measurement instrument contains three domain of human development; haman behavior domain, human psychology domain, and natural/physical domain. Through this study, researchers designed a concept model based on theoretical framework and prior studies and investigated the reliability and validity of the measurement instrument which was developed in accordance with the concept model. For the empirical validation research, a pretest was conducted to 336 elementary school students in grade 2 to 4 in Seoul. Considering reliability and validity of the developed measurement instrument and factor loadings, researchers sorted out 18 questions. And then 18 question test and KICE Critical Thinking Ability Test was conducted to 509 elementary school students in grade 1 to 4 in Seoul. According to the result of the tests, the researchers sorted out final 12 questions. The Cronbach's alpha, reliability of the children's causal reasoning ability test consisted of the final 12 question, was significant as .72. Also, the result of exploratory factor analysis showed that factors of this test were haman behavior domain, human psychology domain, and natural/physical domain. Moreover, the correlation between the KEDI Reasoning Ability Test(2003) scores and the scores of the test developed in the current study was significant as .55. Finally, the result of the analysis about children's grade differences, the development by discrepancy of age was significant in total points and that of each domain. The children's causal reasoning ability test developed by this study can be useful not only for the evaluation of children's thinking ability but also for screening of the handicapped children in thinking ability development.

• Journal of KIISE:Databases
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• v.32 no.4
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• pp.429-440
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• 2005

As rapid improvement in electronic technologies makes sensor hardware more powerful and capable, the application range of sensor networks Is getting to be broader. The main purpose of sensor networks is to monitor the phenomena in interesting regions (e.g., factory warehouses, disaster areas, wild fields, etc) and return required data. The k Nearest Neighbor (KNN) query that finds k objects which are geographically close to the given point is an Important application in sensor networks. However, most previous approaches are either seem to be impractical or are not energy-efficient in resource-limited sensor networks. In this paper. we propose an efficient KNN query processing method in sensor networks. In the proposed method, we dynamically increase searching boundary, if necessary, and traverse nodes inside the boundary until finding k nearest neighbors. Since only the representative sensor nodes are visited, our algorithm reduces a number of messages. We show thorough experiments that the proposed method performs better than the existing method in various network environments.

• Education of Primary School Mathematics
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• v.15 no.2
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• pp.91-106
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• 2012

This study reports pre-service teachers' problem solving process on the problem-based learning(PBL) employed in an elementary mathematics method course. The subjects were 6 pre-service teachers(students). The data were collected from classroom observation. The research results were described by problem solving stages. In understanding the problem stage, students identified what problem stand for and made a problem solving planned sheet. In curriculum investigation stage, students went through investigation and re-investigation process for solving the task. In problem solving stage, students selected the best strategy for solving the task and presented and shared about problem solving results.

• Microbiology and Biotechnology Letters
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• v.37 no.1
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• pp.10-16
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• 2009

Polymerase chain reactin (PCR) could be a simple way to screen new microbial strains producing useful secondary metabolites if their biosynthetic genes are known and candidate strains to be screened are available. In this study, we have screened two myxobacterial strains, KYC3047 and KYC3076, carrying genes appeared to be biosynthetic genes of soraphen A, a potent antifungal substance, out of 50 cellulose degrading myxobacteria using PCR. The two strains were identified as Sorangium cellulosum based on morphological, physiological, and molecular biological characteristics. Both of the strains produced substances having strong antifungal activities as expected against Candida albicans, a causative agent of candidiasis, and Colletotrichum acutatum, a causative agent of anthracnose on pepper.

• KSBB Journal
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• v.22 no.3
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• pp.139-145
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• 2007

An oriental medicinal database was used from medicinal plants for screening of anticancer agents. The prescription frequency and dosage of medicinal plats in 170 anticancer prescriptions were analyzed. From the total prescription score of each medical plant, it was found that high-scored medicinal plants have been widely studied in the previous research on the cancer treatment. Consequently, dangui, hwangui, banha, bachul, jinpy, insam, bacjakyak, deahwang, chungoong, jimo, chunnamsung, omija, hyunggae, huekchook, banggi, boclyung, osooyou were selected as raw materials for the screening of anticancer agents.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06b
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• pp.6-9
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• 2010

학술정보 이용자는 연구에 필요한 자료를 획득하기 위해 검색서비스를 이용한다. 대부분의 웹 이용자는 원하는 정보를 얻기 위해 수많은 검색 질의어를 생성하여 시스템에 요청하고 선별된 정보 리스트들을 탐색하고 정보획득의 최종 목적지로써 해당 정보의 상세화면으로 이동하게 된다. 마찬가지로 논문 및 특허 정보를 제공하는 학술정보서비스의 경우 이용자의 최종 목적지는 한 건의 상세 메타정보 혹은 원문이 되는데, 이 때 이용중인 정보와 유사한 다른 유형의 학술정보 및 관련 연구 분야의 연구자 제공 서비스는 이용자의 정보획득 요구를 쉽게 충족시키기 위한 필수요소이다. NDSL(국가과학기술종합정보서비스) 의 경우 동일 DB내에서의 유사문서 검색기능(논문검색에서는 유사논문 제공, 특허검색에서는 유사특허 제공)을 제공하지만 이는 이종 DB간 유사문서를 이용하고자 하는 사용자 요구사항을 만족시키지 못하는 수준이다. 본 논문에서는 논문, 특허, 연구보고서, 동향분석 자료를 포함한 학술정보 검색서비스에서 사용자 질의어와 검색엔진이 제공하는 검색 요소 및 부스팅(boosting) 기법을 이용한 이종 컨텐츠간 유사문서 리스트 및 관련 연구 분야의 연구자명 검색 서비스 기법에 대해 논한다. 이는 사용자가 원하는 학술정보를 서비스 최종 화면에서 효과적으로 제공함으로써 반복되는 검색 및 탐색의 노력을 줄일 수 있다.

• Journal of Internet Computing and Services
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• v.11 no.1
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• pp.15-20
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• 2010

In this paper, we propose a novel approach to reduce spatial query access latency and energy consumption by leveraging results from nearby peers in wireless broadcast environments. We propose a three-tier Hierarchical Location-Based Sequential access index, called HLBS, which provides selective tuning (pruning and searching entries) without pointers using a linear accessing structure based on the location of each data object. The HLBS saves search cost and index overhead, since the small index size with a sequential index structure results in low access latency overhead and facilitates efficient searches for sequential-access media (wireless channels with data broadcast). Comprehensive experiments illustrate that the proposed scheme is more efficient than the previous techniques in terms of energy consumption.