• 한국경영과학회지
• /
• 제35권1호
• /
• pp.19-45
• /
• 2010

Virtual Communities, which are formed on the Internet, are expected to serve the needs of members for e-collaboration, e-communication, information and knowledge sharing. The executives of organizations should consider virtual community as a new innovation or knowledge pool since members share knowledge. However, many virtual community have failed due to members' low willingness to engage and furthermore to share knowledge with other members. Thus, there is a need to understand and foster the determinants of members' sense of belonging behavior in virtual community. This study develops an integrated model designed to investigate and explain the relationships between contextual factors, personal perceptions of virtual community, usability, trust and sense of belonging in using a certain virtual community. Empirical data was collected from 201 and tested using structural equation modeling (SEM) to verify the fit of the hypothetical model. The results show that the perceived usability and community trust of members significantly influences sense of belonging in using the virtual community, and information quality, system quality, familiarity on the virtual community are significantly influence the usability but not reputation. And I confirmed that perceived shared vision and responsiveness play the role of determinants in making the member's trust, perceived risk influence the making community trust in directly. The results of the study can be used to identify the motivation underlying members' sense of belonging in a certain virtual community by investigating the impacts of contextual factors and personal perceptions on virtual community, the integrated model better explains behavior than other proposed models. This study might help executives of virtual communities and organizations to manage and promote these determinants of sense of belonging to stimulate members' willingness to engage the community and futhermore enhance their virtual community loyalty.

• Journal of Species Research
• /
• 제12권4호
• /
• pp.374-414
• /
• 2023

As part of a comprehensive investigation of indigenous prokaryotic species in Republic of Korea in 2022, 156 bacterial strains were isolated from diverse environmental habitats. These strains were assigned to six phyla, namely Acidobacteriota, Deinococcota, Actinomycetota, Bacillota, Bacteroidota, and Pseudomonadota. Each strain was identified based on 16S rRNA gene sequence similarity (>98.7%) and the formation of robust phylogenetic clades with their closest reported species. Among isolates, there is one species belonging to the phylum Acidobacteriota, one species belonging to the phylum Deinococcota, 28 species belonging to the phylum Actinomycetota, 19 species belonging to the phylum Bacillota, 19 species belonging to the phylum Bacteroidota, and 88 species belonging to the phylum Pseudomonadota (comprising 34 species of the class Alphaproteobacteria, 20 species of the class Betaproteobacteria, and 34 species of the class Gammaproteobacteria). Based on 16S rRNA gene sequence analysis, each strain was assigned to independent and predefined bacterial species. Since there were no published or official reports regarding these 156 isolates in Republic of Korea, they are reported as unrecorded species in Republic of Korea. The Gram stain, colony and cell morphology, basic biochemical characteristic, isolation source, and strain ID of each species are described in the species descriptions.

• Journal of Species Research
• /
• 제12권4호
• /
• pp.415-429
• /
• 2023

As part of a comprehensive investigation of indigenous prokaryotic species in the Republic of Korea, 37 bacterial strains belonging to 36 species were isolated from diverse environmental habitats. These strains were assigned to five phyla, namely Deinococcota, Actinomycetota, Bacillota, Bacteroidota, and Pseudomonadota. Each strain was identified based on 16S rRNA gene sequence similarity (>98.7%) and the formation of definite phylogenetic clades with their closest reported species. Among isolates, there is one species belonging to the phylum Deinococcota, five species belonging to the phylum Actinomycetota, four species belonging to the phylum Bacillota, nine species belonging to the phylum Bacteroidota, and 17 species belonging to the phylum Pseudomonadota (comprising eight species of the class Alphaproteobacteria, one species of the class Betaproteobacteria, and eight species of the class Gammaproteobacteria). Based on 16S rRNA gene sequence analysis, each strain was assigned to independent and predefined bacterial species. Since there were no published or official reports regarding these 36 species in the Republic of Korea, they have been reported as unrecorded species in the Republic of Korea. Their Gram stain, cell morphology, colony, basic biochemical characteristics, strain ID, and isolation source of each species are described in the species descriptions.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 추계학술대회 논문집 전기설비전문위원
• /
• pp.44-46
• /
• 2005

An Electrical facilities of fountain is one of the vulnerable facilities because it is exposed to water. Especially, some children enter the fountain and play in the water in the hot season. For example, death from electrical shock in fountain was reported in domestic and foreign papers. In this paper, we analyzed the riskiness of electrical shock on the basis of a fact-finding survey and comparing the domestic and international standard of electrical facilities in fountains.

• 한국환경생태학회지
• /
• 제28권6호
• /
• pp.664-696
• /
• 2014

본 연구는 대청도와 소청도의 곤충다양성에 관한 연구를 위하여 실시하였으며 2011년 6월부터 10월까지 6회에 걸쳐 주간과 야간조사를 병행하여 실시하였다. 대청도에서 조사된 곤충은 총 9목 75과 286종이며 소청도에서 조사된 곤충은 총 8목 42과 106종으로 대청도와 소청도에서는 9목 78과 336종의 곤충이 서식하는 것으로 조사되었다. 기존 참고문헌을 포함하여 대청도와 소청도에 서식하는 전체 곤충을 정리하면 총 10목 103과 744종으로 나비목이 29과 439종으로 59%의 비율을 차지하며 우점하였고, 딱정벌레목이 27과 124종으로 16%의 비율로 조사되었다. 이 중에서 환경부 지정 멸종위기야생동물은 2종으로 애기뿔소똥구리와 왕은점표범나비가 확인되었다. 그 외 IUCN 적색목록에 포함된 종이 2종(봄처녀나비, 큰주홍부전나비), 국외반출승인대상종 25종, 고유종 5종, 한국적색목록 6종, 특정종 77종, 기후민감종이 2종으로 확인되었다. 본 조사에 새롭게 조사되어 신규등록된 곤충은 대청도에서 58과 147종이며 소청도에서 24과 43종으로 확인되었다.

• 한국응용과학기술학회지
• /
• 제40권3호
• /
• pp.374-384
• /
• 2023

20대를 대상으로 하였던 대학이 최근에는 운영방식, 설립목적, 교육대상이 다양화되었다. 대학의 수에 비해 급격한 학령인구의 감소로 대학(과)은 신입생의 확보와 재학생의 중도탈락 최소화를 위해 최선의 노력을 기울이고 있다. 본 연구는 2년제와 4년제 일반대학과 원격대학의 미용관련 학과 재학생을 대상으로 전공선택동기와 소속감이 학업지속의도에 미치는 효과를 실증하기 위해 온라인 설문을 진행하였다. 일반대학 119명, 원격대학 113명에게 수집된 자료를 SPSS.28를 이용해 분석한 주요한 결과를 요약하면, 일반대학은 전공선택동기는 학업지속의도에 미치는 영향이 유의미하지 않았으나 소속감은 유의미한 정(+)의 효과를 미쳤다. 또한, 소속감이 높아지면 외적동기는 학업지속의도를 유의미하게 상승시키는 조절효과가 나타났다. 원격대학은 전공선택동기 중 내적동기와 소속감이 학업지속의도에 유의미한 정(+)의 효과가 나타났으며 전공선택동기와 학업지속의도의 관계에서 소속감의 조절효과는 유의미하지 않았다. 결과적으로 재학생의 학업지속의도에 있어 일반대학은 대학(과)의 소속감이 주요했으며 원격대학은 내적동기가 주요했다. 이러한 결과는 재학생의 중도탈락 예방을 위한 대학(과)의 효과적인 정책 수립을 위한 의미있는 자료가 될 것으로 기대된다.

• East Asian mathematical journal
• /
• 제4권
• /
• pp.41-56
• /
• 1988

In this work we obtain inequalities for coefficients related to functions belonging to two subclasses of univalent functions with negative coefficients, bounds for the modulus of these functions and their derivatives, and the extreme points of these classes. We also show an application of functions belonging to these classes to the fractional calculus.

• The Plant Pathology Journal
• /
• 제16권4호
• /
• pp.227-230
• /
• 2000

A total of 90 isolates of Fusarium oxysporum f.sp. melonis, the causal agent of oriental melon (Cucumis melo var. makuwa) wilt, was isolated from symptomatic tissues of oriental melon from 4 provinces in Korea. These isolates were grouped into vegetative compatibility groups (VCGs) by demonstrating heterokaryosis through complementation using nitrate nonutilizing (nit) mutants. No self-incompatibility was observed in any of isolates. All isolates were grouped into 3 VCGs ; A, B, and C. iSOLATES BELONGING TO VCG A and VCG B accounted for 87% and 91% of the fungal population collected in 1991 and 1993, respectively. As the increment of cultivation period in the same field, the proportion of isolates belonging to VCG B increased whereas that of isolates belonging to VCG A decreased. Mean virulence of a total population increased as the increment of cultivation period in the same field. Isolates belonging to VCG B showed the highest increment of virulence. These data suggest that replanting of a host plant in the same field may cause increase of virulence in the pathogens. Furthermore, virulence of F. oxysporum f.sp. melonis isolates is related to the VCGs.

• Mycobiology
• /
• 제33권3호
• /
• pp.150-157
• /
• 2005

The fungal flora decomposing rice straw were investigated all over the soil of Sharkia Province, east of Nile Delta, Egypt, using the nylon net bag technique. Sixty-four straw-decomposing species belonging to 30 genera were isolated by the dilution plate method in ground rice straw-Czapek's agar medium at pH 6. The plates were incubated separately at $5^{\circ}C,\;25^{\circ}C\;and\;45^{\circ}C$, respectively. Twenty nine species belonging to 14 genera were isolated at $5^{\circ}C$. The most frequent genus was Penicillium (seven species), and the next frequent genera were Acremonium (three species), Fusarium (three species), Alternaria, Chaetomium, Cladosporium, Mucor, Stachybotrys (two species) and Rhizopus stolonifer. At $25^{\circ}C$, 47 species belonging to 24 genera were isolated. The most frequent genus was Aspergillus (nine species), and the next frequent genera were ranked by Penicillium (five species), Chaetomium (three species), Fusarium (three species). Each of Alternaria, Cladosporium, Mucor, Myrothecium and Trichoderma was represented by two species. At $45^{\circ}C$, 15 species belonging to seven genera were isolated. These were seven species of Aspergillus, two species of Chaetomium and two species of Emericella, while Humicola, Malbranchea, Rhizomucor and Talaromyces were represented by one species respectively. The total counts of fungi the genera, and species per gram of dry straw were significantly affected by incubation temperature and soil analysis (P < 0.05).

• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2006년도 총회 및 춘계학술발표회
• /
• pp.307-311
• /
• 2006

Chemical analyses were conducted for Nakdong River water and riverbank filtrate in Daesan-Myeon area, Changwon City in 2005. Chemical components show different trends in wet season (June, July, August and September) and dry season (the other months). The patterns of chemical variation are classified into four types. Chemical components belonging Type I, as Na and $HCO_3$, show decrease in concentration during wet season and increase in concentration during dry season for both Nakdong River water and the riverbank filtrate. Chemical components belonging Type II, as Mg and $SO_4$, show decrease in concentration during wet season and increase in concentration during dry season for Nakdong River water while show the opposite trend for the riverbank filtrate. Chemical components belonging Type III, as Cl and $NO_3$, show increase in concentration from the start of wet season and high concentration during dry season for both Nakdong River water and the riverbank filtrate. Chemical components belonging Type IV, as Fe, show increase in concentration during wet season and decrease in concentration during dry season for both Nakdong River water and the riverbank filtrate.