• The Transactions of the Korea Information Processing Society
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• v.3 no.4
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• pp.908-914
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• 1996

A number of techniques have been studied for handling uncertainty in the development of expert systems. One of techniques adopted in many expert systems is the Dumpster-Shafer Evidence combination scheme. This has been the main focus among others due to is favorable features and computational complexity. In this paper, we develop and algorithm to deal with the exponential complexity inherent in Dempster-Shafer evidence combination. In the evidence combination process, we divide the frame of discernment into two groups, one for those common in both belief functions and the other for the rest. A property is found that in computing new belief function for the latter group, the result of evidence combination show linear change. The irrelevancy factor is derived and used to compute the change. The main idea of the method is to reduce the size of the frame of discernment and thus exponential complexity.

• The Journal of the Acoustical Society of Korea
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• v.31 no.5
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• pp.309-316
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• 2012

This paper suggest configuration method of small-size system and design method of module using multi power. In particular module designed to focus on PDN(Power Distribution Network) and filter configuration method to improve the characteristics of noise sensitive analog IC. For the prevention of high-voltage noise, manufactured module is used the ground-isolated technique and via stitching, and is connected grounds with a series of filters. In this paper, so we analyzed PDN structure through the simulation using lumped modeling and confirmed through measurement. Simulation results, when connecting 4.7uH inductor, we made certain that noise of -7dB decreases much more than when it did not. And it was confirmed 12% less than Background Noise.

• Journal of Communication Design
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• v.55
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• pp.20-30
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• 2016

This study was to verify the effect of art-education-oriented integrated human resource education (STEAM) on scientific competence and job competence of middle school students. The theme of the program developed for this study is "food design" using a 3-D printer. The 5 mockup lectures were developed for 237 students in ninth and tenth grades of Y Middle School in Gyeonggi-do Province, and the pre-/post-results were analyzed. As a result of analyzing the competence of STEAM education before and after the program, the job competence of general, science, and food science of students was improved after the program in general. Especially among three sub-areas of scientific competence, the change in component of research shows the most significant change in test statistics. The result of test statistics of food science job competence showed the most significant change among three sub-areas: general, scientific, and food science. This program was developed for on-site to be used for a school lecture, and the program may be reformed or used for different themes.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.7
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• pp.539-547
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• 2021

Helicopter rotor blade is required to be designed by considering the interacting effects among aerodynamics, flexibility, and controllability. The reverse design allows the structural components to have common characteristics by using the configuration numerics and experimental results. This paper aims to design the composite rotor blade which will feature common characteristics with that of BO-105. The present engineering design procedure is done by dividing the rotor blade into a few sections and composite laminates across the cross section. For each section, variational asymptotic beam sectional analysis (VABS) program is used to evaluate its flapwise, lagwise, and torsion stiffnesses to have discrepancy smaller than certain tolerance. Finally, CAMRAD II is used to predict the stress acting on the rotor blade during the specific flight condition and to check whether the present deign is structurally valid.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.9 no.2
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• pp.105-113
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• 2015

The purpose of the study was to verify the clinical effect of Computer-based cognitive rehabilitation program for Children for recovering the visual perception and ADL ability in intellectual disability. For this purpose, 3 intellectual disabilities with visual perception and ADL disorders participated in a clinical experiment to verify the effect of Computer-based cognitive rehabilitation program. They all have 5 common conditions in intellectual disability for objective experimental result. All participant were evaluated with Korean-Development Test of Visual Perception-2(K-DTVP-2), Wee Functional Independence Measure(Wee-FIM) before and after the planned intervention sessions. All intervensions were intensively carried out for 20weeks, 1 time a week. The result were as follows. K-DTVP and Wee-FIM scores were improved significantly compared to pre-intervention. Further studies are needed to verify the effect on various group and lots of participants.

• Informatization Policy
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• v.20 no.2
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• pp.3-19
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• 2013

Studies on the SNS political participation have covered issues of SNS effect on political participation, electoral campaigns, and the public sphere. Such issues as characteristics of SNS political participation, the characteristics of SNS users, SNS effect on the political participation, active SNS political participants, and the impact on young people's political participation, etc. have been studied in the area of political participation effect. On the election issues, SNS impact on election turnout, voting behavior, and the election results were main research topics. Finally, the research on the public sphere mainly discussed topics of quality of SNS information and social fragmentation phenomenon. What is commonly observed across all the three subjects is that the conflicting claims appear to almost all the topics. These contradictory findings are likely to occur because variables of real politics are not fully taken into account and research variables are not strictly manipulated. We can get more accurate research results in the study of SNS political participation when we conduct cross-national research reflecting the context of real politics and also designing independent variables more in detail and elaborately.

• Journal of the Korea Convergence Society
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• v.10 no.10
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• pp.143-151
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• 2019

Grit, defined as "perseverance and passion for long-term goals", is a known personality trait that successfully predicts high performance in various fields. In spite of extant evidence of the effectiveness of grit, research has not yet clarified the relationship between grit and conscientiousness, a highly correlated personality trait. In this study(N = 355), we examined the effect of grit and conscientiousness on academic achievement, mediated by self-determination motivation. As a result, grit and conscientiousness both predicted academic performance, and intrinsic motivation mediated these relationships. However, conscientiousness no longer related with motivation and academic achievement when grit was controlled for, whereas grit maintained its relationship with motivation and achievement even when conscientiousness was controlled. This result indicates that although the two psychological concepts overlap to some extent, grit has a unique motivational and behavioral effect that distinguishes it from conscientiousness. The present study expands the current understanding of grit with its comparison between grit and conscientiousness. We suggest future research ought refine the grit scale to establish its discriminant validity.

• Journal of The Korean Association For Science Education
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• v.35 no.6
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• pp.1049-1062
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• 2015

To understand the synergy of collaboration and to apply this understanding to education, an analysis of how a team solves a problem and the sharing of their mental models is needed. This paper analyzed two things qualitatively to find out the source of synergy in a collaborative problem-solving process. First, the sharing contents in team mental model and second, the process of sharing the team mental model. Ten gifted middle school students collaborated to solve an ill-defined problem called sunshine through foliage problem. The gifted students shared the following results after the collaboration: First, scientific concept prior to common idea or the idea that all group members have before the discussions; second, unique individual ideas of group members; and third, created ideas that were not originally in the personal mental model. With created ideas, the team model becomes more than the sum of individuals. According to the results of process analysis, in the process of sharing mental model, the students proposed and shared the most important variable first. This result implied that the analysis of the order of sharing ideas is important as much as finding shared ideas. Also, the result shows that through their collaboration, the gifted students' shared mental model became more refined and expanded as compared to their individual prior mental models. It is recommended that these results can be used to measure shared mental model and develop collaborative learning models for students.

• 재활복지
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• v.21 no.2
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• pp.113-137
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• 2017

In this study, we explore whether and how the experience of discrimination and social support affects physical health and mental health through disability identity among the disabled aged 50 and over. We also examine such relationship differs by the degree of disability. For the empirical test, we utilized the data from the Panel Survey for the Disabled conducted by our research team in 2016. According to structural equation model analysis, social support has a direct effect on disability identity. It also has a direct effect on physical health. As for the mental health, there are found direct effects of discrimination experience, social support, disability identity, and physical health, Furthermore, social support influences the mental health through disability identity. This finding suggests that social support for the disabled in old age increases disability identity and, in turn, it contributes their mental health. In the meanwhile, multiple group comparison analysis reveals the effect of discrimination experience on disability identity is found for those with lower level of disability but not for their counterparts. This seems to result from that the level of common ground which constitutes disability identity is low for the severely disabled. Thus, it requires our efforts to enhance disability identity focusing on common ground for the severe disabled.

• Geophysics and Geophysical Exploration
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• v.19 no.1
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• pp.11-19
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• 2016

Two representative residual static methods of traveltime decomposition and stack-power maximization are discussed in terms of application to land seismic data. For the model data with synthetic shot/receiver statics (time shift) applied and random noises added, continuities of reflection event are much improved by stack-power maximization method, resulting the derived time-shifts approximately equal to the synthetic statics. Optimal parameters (maximum allowable shift, correlation window, iteration number) for residual statics are effectively chosen with diagnostic displays of CSP (common shot point) stack and CRP (common receiver point) stack as well as CMP gather. In addition to removal of long-wavelength time shift by refraction statics, prior to residual statics, processing steps of f-k filter, predictive deconvolution and time variant spectral whitening are employed to attenuate noises and thereby to minimize the error during the correlation process. The reflectors including horizontal layer of reservoir are more clearly shown in the variable-density section through repicking the velocities after residual statics and inverse NMO correction.