• Korean journal of communication and information
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• v.38
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• pp.119-146
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• 2007

The purpose of this paper is to explore the factors causing adolescents' habitual use of text-based online social interaction (TOSI). The authors of the present study assumed that adolescents' perceived intimacy would affect the use of TOSI. Using structural equation modeling, the influences of perceived social presence and Internet self-efficacy on habitual use of TOSI were examined indirectly as well as directly, with and without intimacy as a mediate factor. The results show that the indirect effects were proven to be stronger compared with the direct effects. Perceived intimacy appeared to encourage more frequent uses of TOSI. The effects of intimacy were even more stronger especially with those who had higher levels of Internet self-efficacy.

• Journal of IKEEE
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• v.18 no.1
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• pp.57-63
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• 2014

This paper is to technically implement the sensing platform for Home-Wellness Robot. The self-Localization of indoor mobile robot is very important for the sophisticated trajectory control. In this paper, the robot's self-localization algorithm is designed by RF sensor network and fuzzy inference. The robot realizes its self-localization, using RFID sensors, through the collaboration algorithm which uses fuzzy inference for combining the strengths of triangulation and triangulation. For the triangulation self-Localization, RSSI is implemented. TOA method is used for realizing the triangulation self-localization. The final improved position is, through fuzzy inference, made by the fusion algorithm of the resultant coordinates from trilateration and triangulation in real time. In this paper, good performance of the proposed self-localization algorithm is confirmed through the results of a variety of experiments in the base of RFID sensor network and reader system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.2
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• pp.100-108
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• 2014

In this paper, we design SSD(simultaneous single band duplex) system using RF(radio frequency) cancellation and digital cancellation. we analyze characteristic of residual self-interference after RF Cancellation signal when error of phase shifter occur in RF cancellation. When phase shifter error of $0^{\circ}$, $0.5^{\circ}$, $1^{\circ}$ and $2^{\circ}$ occur in RF cancellation, residual self-interference signal power after RF cancellation is bigger than desired signal power of distant station. So, it is impossible to receive transmit data of distant station. but we confirm that it is possible to receive transmit data of distant station by digital cancellation with frame structure. Also, in digital cancellation with frame structure, if residual self-interference signal after RF cancellation is too large then LMS algorithm requires more time to estimate self-interference channel. That is, performance degradation occurs because self-interference channel estimation has not completed in estimation frame.

• Journal of the Korean Society for Library and Information Science
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• v.42 no.3
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• pp.81-101
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• 2008

The purpose of this study is to develop a course with project-based teaming method for LIS education and to examine the effects of this method on improvement of problem solving and self-directed learning ability of LIS undergraduate students. The research design was one-group pretest-posttest design in quasi-experimental research. The data were collected from 23 LIS undergraduate students and analyzed by paired t-test with SPSS. The result demonstrated that project-based learning method has an significant effect on improvement of problem solving and self-directed learning ability of LIS undergraduate students.

• Journal of the Korean Magnetics Society
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• v.22 no.3
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• pp.97-102
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• 2012

In this paper, a non-contact power transferring has been performed. Power Transferring by using an electromagnetic inductive coupling is more suitable for high power transmission than by using a magnetic resonance method. Power transferring system has been designed with Loading Distribution Method to divide the electric and magnetic loading for designing the magnetic core and electric coil. To design optimum shapes of magnetic yoke, 3D finite element analysis has been performed. Experimental results show good agreement with numerical ones. So, it could be adopted in the electric power transferring system for a short-distance wireless electric power transferring machine.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.9B
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• pp.1381-1389
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• 2010

The smart grid technology is expected to significantly improve energy efficiency by dynamic power supply. One of its application is the Vehicle-to-Grid(V2G) that utilizes an electric vehicle's battery as a household storage battery. Meanwhile, a lot of researches are recently investigated in the area of wireless energy transfer technology because of its convenience and safety in charging a battery. With the wireless energy transfer infrastructure a wireless magnetic induction communication technique can help the dynamic power supply of the smart grid more efficient. In this paper, we propose a wireless magnetic induction communication sion cowhich includes data transmission and location-aware functions. We expect the sion cohelp the smart grid to control power supply more efficiently. We also developed its test-bed and evaluated the performance.

• Journal of Digital Convergence
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• v.13 no.1
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• pp.11-23
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• 2015

Recently the military is improving the policies of military culture for soldiers to lead a better military life. In this effect, 'division A' introduced 'goal-directed self development program'. This program is guiding the soldiers to set up personal mission in life not only in the military but also linked to the future, after being discharged from military service. Therefore the purpose of this research is to test the effect of this program on soldier's objective management, self esteem and satisfaction and to propose political strategies for creating healthier military culture. The research method was to compare and analyze the difference between two groups, 'division A'(experimental group), which operated the program, and 'division B'(controlled group) which did not operated the program. research targets were 488 soldiers in total, 257 soldiers in experimental group and 231 in controlled group. T-test(verification) and analysis of covariance was done with SPSS WIN 11.5 program with collected information. The result showed that the program has meaningful effect in every aspect mentioned above to the soldiers.

• Journal of the Korea Safety Management & Science
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• v.13 no.1
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• pp.11-22
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• 2011

본 논문에서는 자기효능감(Self-efficacy belief)과 산업재해의 관계에 대한 분석을 수행하였다. 먼저 연구의 예비 단계에서는 크게 세 그룹 즉, 현장의 작업자, 현장 및 안전관련 자문업체에 근무하는 안전 관리자, 그리고 산업안전에 관계되는 정부기관 종사자 등을 대상으로 집중면접(Focus group interview)을 실시하였고, 이 집중면접의 결과를 근거로 하여 연구의 본 단계에서 적용될 설문지를 개발하였다. 본 설문지는 산업안전, 산업안전교육프로그램의 평가, 산업안전교육을 향상시키기 위한 방법, 자기만족, 스트레스, 산업재해율, 그리고 인구사회학적요인관련 정보 등과 관련되는 효능감을 평가 하도록 설계되었고, 총 917명(현장작업자: 542명, 안전 관리자: 210명, 정부기관종사자: 165명)에게 설문조사를 시행하였다. 주요 결과를 정리하면 다음과 같다. 첫째, 작업자 그룹의 경우에 안전관련 효능감과 관련한 세 가지 요인(자기관리, 사회적 지원, 환경관리)은 해당 회사의 산업재해율과 부(negative)의 상관관계를 갖는 것으로 나타났다. 둘째, 안전효능감이 높은 현장 작업자는 낮은 현장작업자들과 비교하여 안전관련 수칙을 더 잘 지키고, 자기 인생에 대한 만족도가 더 높으며, 스트레스의 정도가 더 낮은 것으로 나타났다. 셋째, 안전관리자의 경우에 안전효능감은 안전교육 프로그램의 효율성과 정(positive)의 상관관계를 그리고 해당회사의 산업재해율과는 부(negative)의 상관관계를 갖는 것으로 나타났다. 넷째, 정부기관 종사자의 경우에는 경력이 길고 높은 지위에 있을수록 산업안전관리관련 안전효능감이 높은 것으로 나타났다.

• Convergence Security Journal
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• v.18 no.5_2
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• pp.61-71
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• 2018

The ROK military, with changes in the environment. Furthermore, soldiers in their new generation, who have remote difference in their views and characters with former generation. This study attempts to confirm the effects of Coaching Leadership on the military life satisfaction, focused on the Platoon soldiers of ROK Marine Corps. For a more realistic study, the research model is designed through prior studies; Coaching Leadership are set as independent variables; military life satisfaction is selected as dependent variables and Self-efficacy is defined as a mediating variable. A questionnaire survey has been conducted on 1,450 soldiers, including all forces and all branch of ROKMC, January 18 to 25 February, 2016. Analysis were performed using SPSS/WIN 23.0. As a result, First, Coaching Leadership had positively significant with military life satisfaction and Self-efficacy. Second, Self-efficacy had significant effects on the military life satisfaction. Third, Self-efficacy was proven to have a partial mediating effect in the relationship between coaching leadership and military life satisfaction. Based on the results, the theoretical and practical implications of the research findings are discussed, and recommendation for future research are provided.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.3
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• pp.359-366
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• 2021

In this study, It was developed an monitoring cracks system based on image processing techniques in order to measure cracks, which are major damages in concrete, and to convert them into a database. The crack monitoring system consists of crack image captured equipment and a crack detection and analysis software. This system provides objective and quantitative data by replacing the conventional visual inspection. The crack detection algorithm w as verified through an indoor test using virtual cracks, and the amount of crack detection and crack width change was monitored by applying it to the self-healing repair mortar construction site. In the case of the crack width detected through image analysis, the maximum difference from the actual crack width was 0.0334mm. It was possible to detect microcracks of 0.1mm or less, and the effect of crack healing over time of the self-healing repair mortar was confirmed trough the field test.