• 공학교육연구
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• 제18권4호
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• pp.13-25
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• 2015

The purpose of this study was to investigate structural relationships among engineering self-efficacy, outcome expectation, interest, learning persistence, and career preparation behavior of engineering students. Participants (n=428) completed measures of engineering self-efficacy, outcome expectations, interests, learning persistence, and career preparation behavior. Results from structural equation modeling analysis were found to support the proposed model which included learning persistence and career preparation behavior, influence from engineering self-efficacy, outcome expectations, and interests. In addition, major persistence intention and career preparation behavior of engineering college students are influenced by the direct and indirect effects on engineering self-efficacy, interest, and outcome expectations. The implications of the findings on practice for Korean engineering college students are discussed.

• Journal of Pharmaceutical Investigation
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• 제24권1호
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• pp.33-40
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• 1994

In order to develop a broad-spectrum veterinary anthelmintic, a combined preparation of nitroxynil and levamisole was formulated for subcutaneous injection. The preformulation studies on solubilization, physicochemical stability and toxicity of combined preparation were performed. The combined preparation of nitroxynil-N-ethylglucamine and levamisole base could be solubilized up to 50.3%(w/v) of active ingredient concentration in propylene glycol/water system. Injectable solutions were most stable at $4^{\circ}C$. Local toxicities such as flare and edema were not shown when the usual dose of the combined preparation was injected subcutaneously to the rats.

• 가족자원경영과 정책
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• 제17권4호
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• pp.171-187
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• 2013

Individuals are increasingly required to take more responsibility for their own retirement. The purpose of this study was to investigate the efficacy of counseling for retirement planning on awareness and behavior related to retirement preparation. The data came from 3,561 adults who received counseling from National Pension Service. The major findings can be summarized as follows : (1) There were significant changes in awareness and behavior for retirement preparation after receiving counseling services ; (2) young age, type of counseling (comprehensive diagnostics for retirement preparation), and counseling method (face-to-face) had a positive effect on changes in awareness and behavior ; and (3) expertise and adequacy of counseling, as well as the attitude of counselors, had an influence on changes in awareness and behavior.

• Elastomers and Composites
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• 제50권1호
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• pp.35-48
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• 2015

Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a three-dimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.

• 대한치과기공학회지
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• 제37권3호
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• pp.145-155
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• 2015

Purpose: The Purpose of the study is to investigate the need for the preparation of old age of Korean dental technicians. Methods: A total of 778 dental technicians were selected by proportional stratified by region compared to extraction sampling from a list of Korea dental technician Association in 2012. The final sample size was 386. Questionnaires consisted of 9 general characteristics, recognition of old age 4, and preparation of old age 9 on a Liken 5 scale. Cronbach's alpha was 0.784 in the study. All statistical analyzed were performed using SPSS 14.0(Statistical Packages for Social Science Ver. 14.0. Chicago, IL, USA). Results: Factors affecting the aging preparation is gender, age, clinical career, work place(p<0.001). Conclusion: This study suggested that preparation for old age of Korean dental technicians was very important and the preparation must be connected with the social welfare policy.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.30-31
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• 2017

The objective of this study is to evaluate the performance of polymer-modified surface preparation mortars with pozzolanic materials for corrosion prevention method in deteriorated sewage treatment structures. The prepackaged-type surface preparation mortars are prepared with a polymer-binder ratio of 10%, ground granulated blast furnace slag contents of 0, 15, 30%, a fly ash content of 15%. And, the specimens are tested for workability, adhesion in tension, water absorption, crack and impact resistance. As a result, the prepackage-type surface preparation mortars for sewage treatment structure are satisfied with quality requirements by KS F 4716, Japan sewage work agency(JS) and JIS A 6916 for surface preparation mortars.

• 대한치과의사협회지
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• 제57권7호
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• pp.380-391
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• 2019

In recent years, with the introduction of various restorative materials, restorations using CAD/CAM equipment have been increasing in the esthetic dentistry. The critical steps in the fabrication of indirect restorations with CAD/CAM equipment are proper cavity preparation and making accurate impressions. The process of tooth preparation for CAD/CAM restoration should include a mechanical understanding of milling. In addition, during tooth preparation, the clinician should be familiar with additional equipment and techniques for obtaining the convenience. In order to obtain an accurate oral scan, the clinician should understand the limitations of the oral scan and be skilled at techniques for obtaining a successful image when making oral scans. This article focused clinical guidelines for the preparation of CAD/CAM restorations and introduced clinical methods for making successful impression of oral scans in narrow and deep tooth cavity areas.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.245-254
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• 2022

This study is a study to empirically verify the mediating effect on college life adaptation and career preparation behavior of college students. The purpose of this study is to empirically analyze the multi-mediated effects of major satisfaction, job stress, and self-directed learning. For this study, 216 university students were enrolled. For the collected data, SPSS Process macro was used. The result is as follows. First, there were multiple parallel mediating effects and multiple serial mediating effects on major satisfaction, job stress, and self-directed learning between college life adaptability and career preparation behavior. Second, the path of simple mediation and double mediation effect was found between college life adaptation and career preparation behavior. Based on the research, the necessity of revitalizing the program for revitalization of teaching activities and industry-academic cooperation activities in the major field and improvement of career preparation behavior and university life adaptation ability and follow-up research were suggested.

• Applied Microscopy
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• 제51권
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• pp.19.1-19.7
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• 2021

The main purpose of this paper is the preparation of transmission electron microscopy (TEM) samples from the microsized powders of lithium-ion secondary batteries. To avoid artefacts during TEM sample preparation, the use of ion slicer milling for thinning and maintaining the intrinsic structure is described. Argon-ion milling techniques have been widely examined to make optimal specimens, thereby making TEM analysis more reliable. In the past few years, the correction of spherical aberration (Cs) in scanning transmission electron microscopy (STEM) has been developing rapidly, which results in direct observation at an atomic level resolution not only at a high acceleration voltage but also at a deaccelerated voltage. In particular, low-kV application has markedly increased, which requires a sufficiently transparent specimen without structural distortion during the sample preparation process. In this study, sample preparation for high-resolution STEM observation is accomplished, and investigations on the crystal integrity are carried out by Cs-corrected STEM.

• 한국콘텐츠학회논문지
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• 제13권10호
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• pp.365-374
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• 2013

본 연구는 노후에 대한 인식이 국가 민간의료기관 근로자간에 따라 차이가 있는지, 또한 노후인식이 노후준비에 어떠한 영향을 미치는지를 분석하고자 하였다. 연구대상은 부산의 보건소와 병 의원의 근로자 783명을 대상으로 진행하였다. 자료 분석은 SPSS 21.0 프로그램을 이용하여 빈도분석, t-test, 위계적 회귀분석을 실시하였다. 본 연구의 결과는 다음과 같이 나타났다. 첫째, 국가 민간의료기관의 근로자간에 노후에 대한 인식, 정부정책에 대한 만족도, 노후준비에 대해서 부분적으로 차이가 있었으며, 국가 근로자가 민간 근로자 보다 더 잘 인지하고, 만족하며, 비교적 준비하고 있었다. 또한 노후에 대한 인식과 정부정책 만족도는 모두 보통 수준 이상으로 나타났지만, 노후 준비는 미흡한 것으로 나타났다. 둘째, 노후 준비에 영향을 미치는 요인을 알아본 결과 국가의료기관과 민간의료기관 근로자에서 각각 다르게 나타났다. 또한 노후 준비에 미치는 영향은 부분적으로 차이를 보였다. 결론적으로 국가 민간의료기관 근로자간 노후준비에 미치는 영향에는 차이가 있었다. 본 연구는 노후준비에 대한 교육 및 정책수립을 위한 기초자료로 제공하려한다.