• Journal of Korea Multimedia Society
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• v.10 no.9
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• pp.1153-1164
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• 2007

One of the most challenging technical issues in mobile communication for multimedia is Quality of Service (QoS) management of handover calls. This paper proposes a 2-level handover control system to copy with this problem. A 2-level handover control system consists of resource reservation and call admission control modules. The resource reservation module divides the network resource into Hard and Soft reserved resource. The Hard reserved resource is only for the handover calls while the Soft reserved resource is for both the handovers and the new calls. And also, the resource reservation module classifies handovers into primary and secondary handovers based on often they occur. The call admission control module deals with the primary and secondary handover calls in different ways. The new calls can use Soft reserved resource only if there is sufficient amount available in the Hard reserved resource. Proposed system is evaluated using an M/M/c/c queueing model. It is shown that proposed system allows more efficient utilization of network resource without degrading QoS comparing with the legacy handover control systems.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.62-62
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• 2006

Based on the redox couples of a nitroxide radical, organic radical polymers were utilized as the electrode-active or charge-storage component for a secondary battery. We call a battery composed of the radical polymer electrode as "organic radical battery". Organic radical battery has several advantages: high capacity, high power-rate performance, long cycle ability, and environmentally-benign features. Synthesis and electrochemical studies of nitroxide polymers are described. Battery fabrication and cell performance are also reported.

• Korean Journal of Adult Nursing
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• v.21 no.2
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• pp.199-211
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• 2009

Purpose: The purpose of this study was to develop a program for anger management based on self-efficacy. Methods: In this study, four types of approaches to enhance anger control were developed; 1) a role play for vicarious experiences; 2) an assertive training for anger expression; 3) a 30-minute long education program & a 20-minute long telephone call coaching for verbal persuasion; and 4) a booklet for anger management and self care behaviors. One group pretest-posttest design was used for evaluating the program. Study subjects were 6 cancer patients undergoing chemotherapy. The group were received a 4-week intervention, 60 ~ 90 minutes a day weekly, and measured the variables at baseline, 4 weeks later. Anger-in, anger-out, and anger-control were measured by STAXI-K. Data was analysed by Wilcoxon using SPSS/WIN 12.0 program. Anger situation was analysed according to primary anger-thoughts and secondary anger-thoughts based on cognitive theories of anger. Results: The program for anger management consisted of a role play, assertive training, education, telephone call coaching and a booklet. The program revealed significantly less Anger-in (Z = -1.997, p = .046), anger-out (Z = -2.207, p = .027). No difference, however, was found in anger control (Z= -1.826, p=.068). Conclusion: This evaluation suggested that more assertive training and longer intervention may be needed to maximize anger control.

• Spatial Information Research
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• v.11 no.1
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• pp.89-100
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• 2003

The purpose of this study is to search GIS education in High School in Korea. Firstly, Expanded Content of GIS in the 7th National Curriculum call upon increased demand of GIS education. Secondly, It is urgent to development of GIS Education Program, There is insufficient practical instruction of GIS in High School because of ill-equipped environment. For that reason we proposed GIS program. Thirdly, It is necessary to integrate between 'Instruction about GIS' and 'GIS Assisted Instruction' in School. Finally, It is necessary to systematically prepare and study of GIS Education for the future National Curriculum.

• Applied Microscopy
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• v.46 no.1
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• pp.27-31
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• 2016

It has been investigated what kind of characteristic X-ray in electron probe micro-analyzer (EPMA) is effective for the determination of compounds of Si series materials. After comparing the characteristic X-rays among the primary and secondary lines in $K_{\alpha}$ and $K_{\beta}$ obtained from the Si series standard samples, it was found that the secondary line of $K_{\alpha}$ exhibited the most informative spectrum although the intensity was considerably weak. As a result of analyzing the spectrum shapes of the Si series standard samples, the spectrum shape of the secondary line of $K_{\alpha}$ for SiC was different from those for other Si compounds. To grasp the characteristics of the shape, a line was perpendicularly drawn from the peak top to base line in order to divide a spectrum into two areas. The area ratio of right to left was defined to call as the asymmetry index here. As a result, the asymmetry index value of the SiC was greater than one, while those of other Si compounds were less than one. It was found from the EPMA analysis that identification of SiC became successful to distinguish from other Si compounds and this method was applicable for micro-sized compounds in a practical composite material.

• Research in Mathematical Education
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• v.26 no.3
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• pp.203-233
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• 2023

Recent international reform movements call for attention on modeling in mathematics classrooms. However, definitions and enactment principles are unclear in policy documents. In this case study, we investigated United States high-school mathematics teachers' experiences in a professional development program focused on modeling and its enactment in schools. Our findings share teachers' experiences around their discovery of different conceptualizations, appreciations, and conflicts as they envisioned incorporating modeling into classrooms. These experiences show how professional development can be designed to engage teachers with forms of modeling, and that those experiences can inspire them to consider modeling as an imperative feature of a mathematics program.

• Journal of Advanced Navigation Technology
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• v.18 no.5
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• pp.415-420
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• 2014

Another crucial issue is a providing secondary user(SU) with the its guaranteed quality of service(QoS) in cognitive radio systems, from the SU view to be allowed to opportunistically utilize the primary user(PU) spectrum on non-interfering. In this paper, we propose a bandwidth reallocation scheme for reducing SU dropping rate through renegotiation of requested channel numbers when available bandwidth is not enough for accepting the spectrum handoff SUs. We categorize SU calls into two types : the first priority and the second priority SU, and the first SU' service is supported by bandwidth reservation based on ARMA prediction model for PU arrivals, while the second SU's bandwidth demands for spectrum handoff is to be reallocated through their renegotiation. Simulation results show that our scheme can improve SU dropping rate and system resource utilization efficiency by bandwidth reallocation.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.38 no.9
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• pp.1-11
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• 2001

Most handoff control schemes try to offer the negotiated QoS by resource reservation for handoff calls. However, it is very difficult to determine the optimal amount of reservation resource for the handoff calls, and sometimes a considerable waste of network resource may be caused. In order to solve this problem, we propose a 2-level resource reservation and call admission control scheme. In our scheme, handoffs are classified into two types (primary and secondary) based on how often they occur and are dealt with in different ways. Simulation results show that our scheme may allow more efficient utilization of network resource without degrading QoS comparing with the existing with legacy handoff control scheme.

• Journal of Korean Home Economics Education Association
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• v.15 no.2
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• pp.55-66
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• 2003

In Korea home economics in the secondary school level was only taught to girls until 1995. So. home economics education only for girls was criticized to sexist education by the feminists. According to the 6th revision of curriculum. home economics has been taught to girls and boys. But some of curriculum developers raises another questions on home economics education. They argue that home economics is a subject which prepares students for the demand of their day-to-day lives. but they can manage their lives well without school learning. The purpose of this study is to explore the educational values of home economics in secondary education from the gender-sensitive approach. For this study, a literature survey on the nature of home economic education in secondary education and the content analysis on 12 secondary school textbooks of Home Economics were employed. The results are as follows : First, the educational values of home economics education should not be underestimated. The aims of home economics education is to help students grew into a independent person by managing their daily lives. The home is charged with fostering a side of our life which we might call Personal, private. intimate and nurturing. The management of the home needs good skills and attitudes. and many knowledges on the child rearing, family relation, marriage, love and sex, which can not be successfully acquired without school learning. And home economics education for boys and girls can help break down the barriers between the sexes because it can change the attitudes of students regarding the private sphere. which is traditionally where women have worked. Second. most of contents of Home Economics were composed of the women-oriented contents. There was a trend still describing that domestic labor mainly be carried out by mother. And the ideas that only the family consisting of two parents and their children is normal were founded. Finally directions of development of the Home Economics Education are suggested.

• Journal of the Korean Home Economics Association
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• v.48 no.3
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• pp.99-114
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• 2010

This study explored the socialization of novice Home Economics(HE) teachers employing a qualitative research method. Data was collected through in-depth interviews with four novice HE teachers from secondary schools. The collected data was analyzed inductively by NVivo, a kind of CAQDAS. The following analysis was organized around three stages of teachers' careers: first, as for influences on teacher socialization prior to formal teacher education, their experiences on 'apprenticeship of observation' provided them both positive and negative role models; second, as for the socialization role of pre-service teacher education, they mentioned that college courses were poorly connected to classroom realities with only a few helpful lectures on HE Education; third, as for socialization in the workplace and its culture, the novice HE teachers were confronted with many kinds of problems including isolation in the classroom, in-service training programs not geared to novices, an overwhelming workload, and so on. Because of these problems, they yearned for and also formed networks with other HE teachers in order to overcome their limitations. The findings supported the notion that interactive and dialectical processes exist during all stages of HE teachers' careers. This study suggests that the teacher in-service training programs are more relevant, and that the introduction of mentoring programs and classroom manuals and teacher manuals would be helpful in practice. These innovations call for cooperation between universities and provincial offices of education for teachers' professional success in teacher socialization.