• Journal of Welding and Joining
• /
• v.26 no.4
• /
• pp.73-78
• /
• 2008

In this paper, research was the variation of microstructure and mechanical properties of clad(A4045/A3003) Al alloy sheet by gas tungsten arc welding. Tensile properties of the gas tungsten arc welding joint decreased because of the softened heat affected zone(HAZ). The hardness of HAZ was lower than that of base metal, because relieved the work hardening effect of the welding heat. Hardness distribution of the weld zone with the base metal appears similarly, but the hardness of HAZ decreased remarkably. The microstructure in the weld zone of A4045 clad layer was formed a coarse columner grains of Si-rich. In the case of large weld heat input, the Si of the A4045 were diffused and until A3003 weld zone they decreased the strength.

• Journal of Power Electronics
• /
• v.13 no.5
• /
• pp.877-883
• /
• 2013

This paper discussed a transformer-less shunt static synchronous compensator (STATCOM) with consideration of the following aspects: fast compensation of the reactive power, harmonic cancelation and reducing the unbalancing of the 3-phase source side currents. The STATCOM control algorithm is based on the theory of instantaneous reactive power (P-Q theory). A self charging technique is proposed to regulate the dc capacitor voltage at a desired level with the use of a PI controller. In order to regulate the DC link voltage, an off-line Genetic Algorithm (GA) is used to tune the coefficients of the PI controller. This algorithm arranged these coefficients while considering the importance of three factors in the DC link voltage response: overshoot, settling time and rising time. For this investigation, the entire system including the STATCOM, network, harmonics and unbalancing load are simulated in MATLAB/SIMULINK. After that, a 35KVA STATCOM laboratory setup test including two parallel converter modules is designed and the control algorithm is executed on a TMS320F2812 controller platform.

• The Journal of Korean Association of Computer Education
• /
• v.18 no.1
• /
• pp.21-33
• /
• 2015

The purpose of this study has been found to be effective using web-based instruction than traditional teaching-learning method on academic achievement applying the meta-analysis method. The results of this study were as follows: First, The 85% subject of analysis of web-based instruction selected in this study turned out to be clear effective than traditional teaching-learning method in academic achievement of students. Second, Web-based instruction is more effective for academic achievement of elementary school students and university students than for middle school students and high school students relatively. Third, Web-based instruction is a most effective method in social subject and physical education but less effective in language subject. The overall results of this study concluded more powerful and big decisions which have integrated each different effects on academic achievement of studies web-based instruction method applying meta-analysis. Through this study, make better results were obtained and suggested the base line data and direction for follow up studies.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.12 no.1
• /
• pp.104-114
• /
• 2006

Genetic knowledge for oncology nurses is important in Korea because oncologists are incorporating genetic counseling and genetic testing into their practice. The purpose of this paper is to describe our method of developing the first academic cancer genetic risk assessment and counseling course for Korean nurses. A one-week (non-credit) cancer genetics counseling program was constructed for master's level Korean oncology nurses. The course emphasized basic genetic concepts and principles the genetics of cancer; hereditary cancer syndromes; family history assessments; pedigree construction; risk calculation; surveillance recommendations and treatment options ethical, legal, social, and psychological issues inherent in genetic testing. The goals of this program are to: 1) provide a comprehensive knowledge base for nurses who are currently expanding their scope of practice into the genetic counseling role 2) introduce this knowledge to nurses who want to use it in their practice; and 3) provide cancer genetic knowledge and resources to Korean nursing faculty who plan to incorporate this knowledge into existing master's courses. This academically-based course is recognized as valuable by nurses, nursing faculty, and physicians. With this new knowledge nurses can begin toexpand their role in delivering comprehensive cancer care services.

• The Journal of the Korea Contents Association
• /
• v.16 no.11
• /
• pp.594-604
• /
• 2016

This study was performed by targeting nurses majoring in nursing science of Korea National Open University in order to examine the level of their class satisfaction, academic self-efficacy and self-directed learning ability and to identify their effects on self-directed learning ability. Data was collected by targeting 231 nurses majoring in nursing science of Korea National Open University and for data analysis, technical statistics, correlation analysis and multiple regression analysis were performed through statistical analysis program. This study revealed that there was significant correlation among the levels of participants' class satisfaction, self-directed learning ability and academic self-efficacy and it was identified that class satisfaction and self-directed learning ability affected academic self-efficacy. The findings of this study could be utilized as base data when developing a program to enhance nursing student's self-directed learning ability and it is suggested that an interventional research of analyzing validity and effectiveness of developed education program would be also required.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.13 no.2
• /
• pp.197-219
• /
• 2002

Education is an intentional change of human behaviors. This change is implemented through the learning process of humans. The principles in the learning process and its psychological mechanism are based on learning theories. The objective insight about how they are related with school libraries as a basic organization supporting school education, what they can contribute and what their research methodologies are is a base for educational and academic research of school libraries. This study at first is to investigate learning and teaching theories for school libraries based on behavioral learning theories, cognitive learning theories and constructive learning theories which are general trends for learning theories. Then it is to introduce new theory 'library-based education approach (LBEA)'as an educational base of school libraries.

• Proceedings of the Korean Society for Information Management Conference
• /
• 2005.08a
• /
• pp.215-224
• /
• 2005

이 연구는 대학도서관 사서에게 어떠한 지적 기반을 요구하고 있는가에 대한 물음에서 시작되었다. 현 문헌정보학 교과과정이 대학도서관에 필요한 사서를 양성하는데 적합한지 현장 사서들의 의견을 들어보았다. 특히, 시대가 요구하는 대학도서관 사서들이 갖추어야 하는 능력이 무엇인지 지식, 기술, 태도의 측면으로 나누어 살펴보았다. 이를 바탕으로 대학도서관이 요구하는 사서를 양성하기 위해서 문헌정보학 교과과정은 어떻게 변화되어야 하는지 논의해보았다.

• The Academic Congress of Korean Shoulder and Elbow Society
• /
• 1998.03a
• /
• pp.15-19
• /
• 1998

The arthroscopic treatment may prove to be the desirable method, but this arthroscopic technique cannot be appliable to all surgeons and all patients, It should be determined on the base of type of lesion, effectiveness of arthroscopic procedure, and the surgeon's skill. The Key to an excellent result in arthroscopic treatment of rotator cuff lesion is doing a proper diagnosis, well-established arthroscopic technique and following through a well-designed rehabilitation program.

• Journal of the Korean School Mathematics Society
• /
• v.5 no.1
• /
• pp.111-122
• /
• 2002

The purpose of this study was to examine high school second graders' understanding of the basic nature of logarithm, the major type of error they made about logarithmic function and the cause of such an error, and to seek ways to instruct it better. For that purpose, three research questions were posed: 1. Investigate how much high school students in their second year comprehend the nature of logarithm. 2. Analyze what type of error they make about logarithmic function. 3. Analyze the cause of their error according to the selected error models and how it could be taught more efficiently. The findings of this study were as below: First, the natural science students had a better understanding of the basic nature of logarithm than the academic students. What produced the widest gap between the two groups' understanding was applying the nature of logarithm to the given problems, and what caused the smallest gap was the definition of logarithm and the condition of base. Second, the academic students had a poorer understanding of the basic nature of logarithmic function graph and of applying the nature of logarithm to the given problems. Third, the natural science students didn't comprehend well the basic nature of logarithmic function graph, the nature of characteristics and mantissa. Fourth, for all the students from academic and natural science courses, the most common errors were caused by the poor understanding of theorem or nature of the ［E4] model. Fifth, the academic students made more frequent errors due to the unfamiliar signs of the ［El］ model, the imperfect understanding of theorem or nature of the ［E4］ model, and the technical part of the ［E6］ model. Sixth, the natural science students made more frequent errors because of the improper problem interpretation of the ［E2］ model and the logically improper inference of the ［E3］ model.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.18 no.1
• /
• pp.147-168
• /
• 2007

Academic library 2.0 which is adapted from Web 2.0 is expected to reform library services. This study analysed the librarian's tasks in the new environment of academic library 2.0 to provide a base of new task development that combined traditional and new works. The analysing of a librarian's tasks resulted in some changes to the concept of traditional tasks like that of : 'Collection Development and Acquisitions' changed to 'Resource Development', 'Cataloging and Classification' changed to 'Technical Development', 'Circulation' changed to 'Information Literacy'. 'Reference Work' changed to 'Service Development', 'Preservation' changed to 'Archiving'. The Tasks of a Librarian is expanding and the important issues for 'Expanding the Professional Role of the Librarian' are cooperation, educational culture and technological ability.