• 한국학교보건학회지
• /
• 제9권2호
• /
• pp.185-195
• /
• 1996

This study attempts to discover ways to prevent and cope with stress m primary school students, Specific, ally, we wish to investigate the sources of stress and to identify the variance and frequency of coping methods which have been used by the subjects. After examining the school children's list of items about stress and coping strategies by on open structure method, subjects ranked the seventy of stressor's and frequency of a coping strategies by closed structure method. A survey was done of 720 students who were from the 4th to 6th grade in 4 primary schools in the Chonbuk area from April 1st to May 30th, 1995. The major results obtained from this study were the following. 1. The sources of stress bad were classified in 57 items Among the 57 items, 'were school records' 'illness of parents' 'death of family members' 'meetings with trouble makers' ranked high ranking in the stress ratings. 2. Severity of stress. the mean total stress scores were 186.4 with 285 as the highest score. 3. The kinds of coping with stress using were classified in 35 items, Among the 35 items, 'wandering and walking alone' 'mood getting out of the in any way' 'trying to forget the stressor' 'were among the highest scored. 4. Frequency of coping with stress: mean total stress coping scores were 67.9 with 140 as the highest score. 5. Difference m stress and coping strategies between sex, age, living district and religion groups were examined. 1) Significant variables influencing stress scoring were sex (t=-2,29, p<.001) and grade (F=6.33, p<.001). 2) Significant variables influencing stress coping practice were residence (t=1.94, p<.05), sex (t=-3.17, p<.002) and religion (F=5,95, p<.0001).

• 구강회복응용과학지
• /
• 제23권4호
• /
• pp.269-281
• /
• 2007

Fluoric acid etching is an essential procedure in cementation of reinforced ceramics to tooth surface. But there have been few studies about the changes of surface structure and flexural strength of IPS $Empress^{(R)}$ 2 ceramic according to the etching time. The objectives of this study were to examine the surface structure changes and the difference in biaxial flexural strength of IPS $Empress^{(R)}$ 2 ceramic according to various etching times. Sixty one disk-shaped specimens of IPS $Empress^{(R)}$ 2 ceramic($14mm{\times}1.2mm$) were fabricated for the biaxial flexural strength test and SEM analysis according to the manufacturer's recommendations. Sixty specimens were divided into 6 groups(n=10) according to the time of HF acid etching(0, 20, 180 and 300s)and silane/resin cement application. Each disk was loaded using a piston-on-3 ball biaxial configuration in a universal testing machine. The failure loads(N) were recorded, and the biaxial flexural strength for each disk was calculated. A one-way analysis of variance and independent t-test on transformed fracture strength data were used to determine significant differences between groups. The groups of no cementation showed a trend toward progressive weakening with increasing the etching time. However, this was not statistically significant at p=0.05 level. The groups of resin cementation exhibited no apparent trend in their mean strength values. SEM photomicrographs showed very different results of etching. Within the conditions of this study, alteration of surface topography by acid etching does not have a deleterious effect on the biaxial flexural strength of IPS $Empress^{(R)}$ 2 ceramic.

• 영재교육연구
• /
• 제20권2호
• /
• pp.595-619
• /
• 2010

본 연구는 Pfeiffer와 Jarosewich(2003)에 의해서 개발된 Gifted Rating Scale(GRS)을 한국어로 번역한 한국어판 GRS의 구인타당도를 검증하고자 하였다. GRS는 교사의 평가에 의해서 아동의 영재성을 판별하는 척도로 미국 교육부의 영재성에 대한 정의에 기초하여 영재성의 6개 하위영역(지적 능력, 학업적 능력, 예술적 재능, 창의성, 지도력, 동기)을 측정하도록 개발되었다. 본 연구에서는 한국어판 GRS의 구인타당도 검증을 위하여 서울 경기 지역에 있는 5개 초등학교에서 자료를 수집하여 확인적 요인분석과 탐색적 요인분석을 실시하였다. 확인적 요인분석 결과 한국어판 교사용 GRS는 미국판 GRS와 동일한 요인구조를 가지고 있는 것으로 나타났으나 학부모용의 경우 미국판 GRS와 동일한 요인구조를 가지고 있다고 결론 내릴 수 없었다. 이러한 결과들은 한국어판 GRS 교사용의 타당도에 대한 근거를 제시해 주고 있으며, 한국 교육 현장에의 적용 가능성을 시사하고 있다.

• Applied Biological Chemistry
• /
• 제40권5호
• /
• pp.447-450
• /
• 1997

18 종의 N-치환 phenyl 1,3,5-trimethylpyrazole-4-carboxamide 를 합성하여 벼 잎집무늬 마름병균 Rhizoctonia solani $K{\ddot{u}}hn$ 에 대한 균사생육억제력 $(pEC_{50})$ 과 이 균에서 분리한 succinate dehydrogenase (SDH)의 효소활성 저해력 $(pI_{50})$ 을 측정하였다. 구조-활성 상관연구를 통해 균사생육억제력이 SDH 효소저해력과 소수성인자인 chromatographic capacity factor $(\acute{k})$ 에 의해 79%까지 유의성 있게 해석되었으며 이는 합성한 화합물의 주작용점이 SDH 이고 생체내에서 작용점까지 도달하는데 필요한 소수성성질이 살균력의 발현에 중요한 인자임을 보여준다.

• Applied Biological Chemistry
• /
• 제35권5호
• /
• pp.382-388
• /
• 1992

N-치환 phenyl-5-chloro-1,3-dimethylpyrazole-4-carboxamide 45종을 합성, Rhizoctonia solani에 대한 50% 균사생육저해율$(EC_{50})$을 검정한 후 구조활성상관관계를 규명하기 위해 화합물의 소수성 파라메타인 log k', 치환기의 소수성 파라메타 ${\pi}$, 전자적 파라메타인 Hammett 치환상수 ${\sigma}$ 및 입체적 파라메타인 STERIMOL 상수 L을 사용하여 다중회귀식을 도출하였다(식(8)). 이 식에 의해 83%의 생리활성변화가 유의성있게 해석되었으며 활성에 영향을 미치는 가장 중요한 인자는 화합물의 체내흡수 및 작용점으로의 이행에 관여하는 log k'으로 밝혀졌고 그 밖에 phenyl고리의 2번위치와 3번위치 치환기의 장축을 표현하는 입체적 파라메타인 $L_3$과 $L_4$등도 활성을 지배하는 인자로 확인되었다.

• 한국진공학회지
• /
• 제9권3호
• /
• pp.221-226
• /
• 2000

졸겔법 및 진공증착법으로 $WO_3$ 및 $V_2O_5$ 박막을 제조하고, 리튬이온을 이용하여 전기변색 소자를 제작한 후 광학적 특성을 조사하였다. 측정결과 졸겔법으로 제조된 $WO_3$ 박막과 $V_2O_5$ 박막을 수증기 분위기에서 $500^{\circ}C$로 1시간 열처리한 경우 가장 우수한 투과율 변화량을 나타내었다. 정.역방향 동작을 거듭할수록 $WO_3$막의 텅스텐과 ITO막의 인듐이 상호 확산하는 것을 관찰할 수 있었으며 이를 방지하기 위해 수백 $\AA$의 텅스텐 박막을 ITO와 $WO_3$막 사이에 삽입한 결과, cyclic voltamogram의 peak의 감소량이 1/10 이하로 감소하였으며, 리튬이온의 흐름에 의한 인듐과 텅스텐의 이동을 효과적으로 방지할 수 있었다.

• Horticulture, Environment, and Biotechnology : HEB
• /
• 제59권6호
• /
• pp.875-888
• /
• 2018

Tulip (Tulipa L.) is one of the most important ornamental geophytes in the world. Analysis of molecular variability of tulips is of great importance in conservation and parental lines selection in breeding programs. Of the 70 genic microsatellites, 15 highly polymorphic and reproducible markers were used to assess the genetic diversity, structure, and relationships among 280 individuals of 36 wild and cultivated tulip accessions from two countries: Iran and the Netherlands. The mean values of gene diversity and polymorphism information content were 0.69 and 0.66, respectively, which indicated the high discriminatory power of markers. The calculated genetic diversity parameters were found to be the highest in wild T. systola Stapf (Derak region). Bayesian model-based STRU CTU RE analysis detected five gene pools for 36 germplasms which corresponded with morphological observations and traditional classifications. Based on analysis of molecular variance, to conserve wild genetic resources in some geographical locations, sampling should be performed from distant locations to achieve high diversity. The unweighted pair group method with arithmetic mean dendrogram and principal component analysis plot indicated that among wild tulips, T. systola and T. micheliana Hoog exhibited the closest relationships with cultivated tulips. Thus, it can be assumed that wild tulips from Iran and perhaps other Middle East countries played a role in the origin of T. gesneriana, which is likely a tulip species hybrid of unclear origin. In conclusion, due to the high genetic variability of wild tulips, they can be used in tulip breeding programs as a source of useful alleles related to resistance against stresses.

• 한국기록관리학회지
• /
• 제22권1호
• /
• pp.61-82
• /
• 2022

이 연구는 국가기록원에서 개설되어 운영되고 있는 기록관리 사이버교육 학습만족도에 영향을 미치는 요인에 대해서 알아보는데 있다. 사이버교육은 입문 과정, 심화 과정, 교양 과정으로 이루어졌다. 학습만족도 주요 요인으로 '내용구성의 타당성, 교수·학습자 간 상호작용, 학습동기, 학습태도의 적극성, 이용환경의 용이성, 조직의 지원정도'를 설정하였다. 각 교육과정의 사이버교육 학습만족도에 대한 온라인 설문조사를 실시하였다. 조사는 기록물관리 전문요원이 배치된 107개 기관을 대상으로 실시하였으며 추가적인 심층인터뷰도 실시하였다. 설문분석은 요인분석·독립표본 t검정·ANOVA분석·상관분석·다중회귀분석 등으로 이루어졌다. 연구결과, 학습만족도에 영향을 미치는 요인은 교수·학습자간 상호작용, 학습동기, 내용구성의 타당성 순으로 나타났다.

• Journal of Forest and Environmental Science
• /
• 제38권3호
• /
• pp.195-206
• /
• 2022

Gaining an understanding of bird communities in different habitat types is essential for the conservation of ecologically important habitats. Wetlands possess different types of habitats and provide an important environment for wintering waterbird communities. This study compares avian communities in five different habitat types in the Moeyungyi Wetland Wildlife Sanctuary (MWWS), Myanmar. From December 2014 to the first week of February in 2015, bird and habitat data were collected from representative areas of five habitat types (i.e., short grassland, tall grassland, lotus fields, open water areas, and rice fields) at MWWS. We established nine sampling plots in each habitat type, and used the point quadrat method to survey habitats and the point count method to survey birds in the habitats. Simple one-way analysis of variance (ANOVA) and post-hoc tests were used to determine differences between bird communities. We made 95 detections during 19 daily visits to each of the five habitat types. During the survey period, we recorded a total of 10,389 individuals belonging to 52 different bird species, based on 7-min observations at each of the 45 point count stations. Furthermore, we detected significant differences by habitat structure (i.e., vegetation coverage, height, and density; water depth; and plant species diversity) as well as bird communities (i.e., species richness, abundance, and diversity indices). In addition, the detailed analysis of 52 avian species revealed significant differences among 45 species with respect to the mean numbers of observed individuals in the survey habitats. The findings of this study revealed significant differences in the structure and composition of waterbird communities among the five assessed habitat types. Because natural marshes provide preferable habitats for a larger number and greater diversity of birds, relative to rice fields, natural marshes should be prioritized for conservation and restoration in Moeyungyi Wetland Wildlife Sanctuary.

• Fisheries and Aquatic Sciences
• /
• 제25권12호
• /
• pp.601-618
• /
• 2022

The genus Semisulcospira is an economically and ecologically valuable freshwater resource. Among the species, Semisulcospira coreana, Semisulcospira forticosta and Semisulcospira tegulata are endemic to the Korean peninsula and Semisulcospira gottschei is widespread in Asia. Therefore, maintenance and conservation of wild populations of these snails are important. We investigated the genetic diversity and population structure of Semisulcospira based on the mitochondrial cytochrome c oxidase subunit I (COI), NADH dehydrogenase subunit 4 (ND4), and combined mitochondrial DNA (COI + ND4) sequences. All four species and various genetic makers showed a high level of haplotype diversity and a low level of nucleotide diversity. In addition, Fu's Fs and Tajima's D neutrality tests were performed to assess the variation in size among populations. Neutrality tests of the four species yielded negative Fu's Fs and Tajima's D values, except for populations with one haplotype. The minimum spanning network indicated a common haplotype for populations of S. coreana, S. tegulata and S. gottschei, whereas S. forticosta had a rare haplotype. Also, genetic differences and gene flows between populations were assessed by analysis of molecular variance and using the pairwise fixation index. Our findings provided insight into the degree of preservation of the species' genetic diversity and could be utilized to enhance the management of endemic species.