• Toxicological Research
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• 제11권1호
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• pp.37-42
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• 1995

Effect of cadmium on the early amphibian development was analyzed through FETAX (Frog Embryo Teratogenesis Assay: Xenopus). Embryos manifested concentration-dependent mortality and realformations; shortage of anterior-posterior axis gut realformation, ocular anomalies, bent notochord, misshapen dorsal fin, and derreal blisters. The treatment with 1.5ppm cadmium solution caused 100% mortality and concentration of lppm did not kill the embryos that caused 100% anomaly. The teratogenic index (TI = LC50 /EC50) was 2.8 indicating that $CdCl_2$ is teratogenic for Xenopus laevis. Embryos that were pulsetreated with at early to late blastula stage (St. 3-9) and mid to late blastula stage (St. 6-10) showed relatively strong resistance to cadmium, but the embryos treated at gastrula stage (St. 10-13) showed high mortality. And the embryos treated at tailbud stage (after St. 25) showed highest mortality of any other early stages. Effects of temperature were studied through pulse- treatment during gastrula stage at $20^{\circ}C$ and $30^{\circ}C$. The embryos treated with 7.5ppm at $30^{\circ}C$ and 15ppm at $20^{\circ}C$ caused 100% mortality respectively, indicating that higher temperature had more severe toxic effect. One of the most peculiar effect of cadmium at gastrulation was distortion of the tail. The probable cause of toxic effect of Cd was discussed.

• 한국식품저장유통학회지
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• 제4권2호
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• pp.131-137
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• 1997

Effect of storage on the tree and quality of early cultivar of Citrus unshiu Marc. produced in Cheju according to harvest time were investigated. Soluble solids, acid content, flesh ratio, firmness and specific cavity of the fruits harvested at 27th of November were 12.0, 1.03%, 79.98%, 0.774kg-force, 0.912, respectively. Soluble solids, total sugar and reducing sugar were increased gradually, but acid content was decreased slightly as delayed in harvest time. Otherwise specific gravity and firmness were not shown in great during harvest time, color index(a/b) was increased sharply till late November and then remained in stationary phase. On these result, we recommend that the harvest time of early cultivar of Citrus unshiu Marc. would be during December because of wilting partly. Fully ripened-fruits harvested late, compared to ordinary harvest time, with cold storage would be kept more quality and freshness of fruits for fresh consumption than the fruits harvested early and stored at room temperature.

• 대한가정학회지
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• 제41권5호
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• pp.41-58
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• 2003

The purpose of this study is to develop and evaluate a social competence enrichment program for institutionalized children in early childhood. The program was developed to enhance institutionalized children's social competence. The program consists of sixteen 30-minute sessions. 19 institutionalized children (11 boys and 8 girls) participated in this program. The effect of this program was evaluated by institutionalized preschool children's emotional knowledge and interpersonal problem solving strategy. Assessment of emotional knowledge consists of identification and situation task. Interpersonal problem solving strategy includes forceful, prosocial, and manipulative strategy. Results showed that there was a significant experimental effect for emotional knowledge. Experimental children showed higher scores of emotional knowledge than control children. Also, there was a significant experimental effect for prosocial and forceful strategy. Experimental children showed higher ratio of prosocial strategy and lower ratio of forceful strategy than control children. The results of program evaluation revealed that this program was helpful for promoting institutionalized children's social competence.

• International Journal of Advanced Culture Technology
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• 제8권3호
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• pp.166-171
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• 2020

The purpose of this study to discover what effect the mathematics education program linked to outdoor movement activities have on the ability to manipulate objects. The subject of study was a kindergarten class. The experimental and comparative groups consisted of 20 people each. In order to verify the effect of applying the early childhood mathematics education program in connection with outdoor movement activities, a total of 15 weeks of program was conducted for young children. As a result of conducting this study, it was found that a mathematics education program linked to outdoor movement activities improves the ability to manipulate objects. The discussion based on the results of this study is as follows. First, we suggest to specific activities that can be performed in an outdoor environment should be developed and applied to the field of early childhood education. Second, we suggest that It is necessary to program various subjects that link to outdoor movement activities. Third, we suggest what various measures are needed to improve the young children's ability to manipulate objects.

• 한국세라믹학회지
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• 제27권8호
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• pp.1055-1063
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• 1990

The early hydration characteristics of the system $C_3S-C_3A-C_4AF$ according to the clinker composition variations, in order to establish the mutual interactionof clinker minerals during the portland cement hydration, have been studied. The early hydration rate of $C_3S$ was greatly effected by the change of $C_3S/C_3A$ ratio. The lower the $C_3S/C_3A$ ratio was, the faster the apex reaching time and the rate of heat liberation of the 2nd exothermic peak originating from the formation of $Ca(OH)_2$ were. The effect of $C_3S/C_3A$ ration on the amounts of $Ca(OH)_2$ formation was decreased, in process of hydration time, but the effect of $C_3S$ content was increased.

• 재활치료과학
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• 제7권3호
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• pp.9-21
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• 2018

목적 : 본 연구는 국외 학술지를 대상으로 체계적인 문헌고찰을 통해 자폐스펙트럼장애(autism spectrum disorder, ASD)아동들을 대상으로 사용되는 조기 중재 방법의 효과를 확인하는 것이었다. 연구방법 : 2017년 12월 이전까지의 국외 학술지에 게재된 논문을 Pubmed를 통하여 검색하였다. 주요 검색어로는 'autism', 'autism spectrum disorder', 'ASD', 'high function autism', 'high function ASD', 'Asperger syndrome', 'pervasive developmental disorder', 'PDDNOS', 'intervention'과 'early intervention'를 사용하였다. 최초 검색된 논문은 724편이었으나 포함 및 배제기준을 적용하여 최종 10편의 연구가 선정되었다. 결과 : 자폐스펙트럼장애 아동의 조기 중재는 10편의 선정된 연구 중에서 8편의 연구가 응용행동분석에 기초한 중재 프로그램을 적용하였고, 다른 2편의 연구들은 감각 통합적 접근과 테크놀로지에 기반을 둔 중재접근을 사용하였다. 대부분의 연구가 조기 중재로 의사소통기술과 사회적 상호작용기술, 지능, 적응 행동의 증가, 동시집중력의 향상과 같은 긍정적인 효과를 보고하였다. 결론 : 본 연구는 자폐스펙트럼장애 아동의 조기 중재에 대한 근거를 제시하며, 향후 국내 연구에서 효과적인 조기 중재에 대한 효과를 확인하는 연구가 필요할 것으로 사료된다.

• 영재교육연구
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• 제16권2호
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• pp.143-166
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• 2006

본 연구는 조기진급 및 조기졸업제를 활성화하기 위해 지금까지 교육현장에서 본 제도를 적극적으로 활용하지 못하는 이유를 학생의 사회 정서적 측면에 초점을 두어 분석하고 실증적으로 자료를 제시하였다. K 대학교에 재학 중인 52명의 학생을 대상으로 자아존중감검사(Coopersmith, 1967, 1981, 1984)와 학교생활에 대한 지각검사(이미순, 이현주, 2006)를 실시하였다. 조기진급 및 조기졸업의 유무에 따른 자아존중감을 연구하기 위해 학생의 GPA를 공변량으로 설정한 후, 다변량 공분산 분석(MANCOVA)를 실시하였고, 대학에 입학하기 전 고등학교 생활에 대한 지각의 차이는 다변량 분산 분석(MANOVA)를 통해 조사하였다. 연구결과, 사회 정서적측면에 대한 우려와 달리 조기진급 및 조기졸업에 의한 자아존중감에서 유의한 집단간 차이는 나타나지 않아, 조기진급 및 조기졸업을 한 후 대학에 입학한 학생들이 자신을 부정적으로 지각하지 않는 것으로 나타났다. 오히려 조기진급 및 조기졸업자들이 일반적으로 자신을 보다 긍정적으로 지각하였고, 고등학교 재학 중에 조기졸업에 대한 기회와 정보가 많았다고 응답하였다.

• Journal of Periodontal and Implant Science
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• 제36권4호
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• pp.879-889
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• 2006

The early exposure of cover screws is a common complication of 2-stage implant technique. The exposure of cover screws between stage I and IT surgery may cause inflammation in the soft tissues surrounding the implants, and lead to peri-implantitis or marginal bone loss. The purpose of this study was to evaluate the effect of the early exposure of cover screws on implants placed using 2-stage technique. Two hundred and nineteen implants in 77 patients were examined for cumulative survival rate, radiographic marginal bone level change, cause and frequency of the early exposure. The results were as follows: 1. Twenty-five implants showed early exposure of cover screws with a frequency of 11.4%. 2. Cumulative survival rate of the implants with early cover screw exposure was 88.0%, and that of the implants without cover screw exposure was 96,9%. 3. At the time of stage IT surgery and 1 year after loading, the marginal bone loss was greater around the implants with early exposure of cover screws than around the implants without cover screw exposure(p <0.05), 4, There was no statistically significant difference in the frequency of the early exposure according to the implant diameter, gender, and smoking(p >0,05).

• KIEAE Journal
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• 제16권2호
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• pp.17-22
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• 2016

Purpose: Sensitivity analysis offers a good guideline for designing energy conscious buildings, which is fitted to a specific building configuration. Sensitivity analysis is, however, still too expensive to be a part of regular design process. The One-at-a-time (OAT) is the most common and simplest sensitivity analysis method. This study aims to propose a reasonable ground that the OAT can be an alternative method for the variance-based method in some early design scenarios, while the variance-based method is known adequate for dealing with nonlinear response and the effect of interactions between input variables, which are most cases in building energy simulations. Method: A test model representing the early design phase is built in the DOE2 energy simulations. Then sensitivity ranks between the OAT and the Variance-based methods are compared at three U.S. sites. Result: Parameters in the upper rank by the OAT do not much differ from those by the Main effect index. Considering design practices that designers would chose the most energy saving design option first, this rank similarity between two methods seems to be acceptable in the early design phase.

• 한국컴퓨터정보학회논문지
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• 제25권10호
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• pp.241-248
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• 2020

본 연구에서는 새벽배송의 물류서비스품질(주문품질, 배송품질, 사후서비스품질)과 고객만족 간의 영향 및 친환경 태도의 조절효과를 살펴보기 위하여 선행연구를 바탕으로 변수를 구성하였다. 새벽배송 이용자를 대상으로 설문조사가 이루어졌으며 210개의 설문지를 실증분석에 사용하였다. 수집된 데이터는 SPSS 25.0과 AMOS 21.0에 의해 분석되었다. 그 결과는 다음과 같다: 첫째, 새벽배송의 물류서비스품질은 고객만족에 모두 긍정적인 영향을 미치는 것으로 나타났다. 둘째로, 새벽배송의 배송품질이 고객만족에 가장 큰 영향을 미치는 것으로 나타났다. 셋째, 새벽배송 물류서비스품질과 고객만족과의 관계에서 친환경 태도의 조절효과를 검정한 결과, 물류서비스품질 중 주문품질의 경우 친환경 태도에 따른 그룹 간의 차이를 확인할 수 있었다. 분석결과를 바탕으로 본 연구의 시사점과 한계점을 제시하였다.