• Journal of The Korean Association of Information Education
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• v.20 no.4
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• pp.357-366
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• 2016

The ability of computational thinking is a key competence that person of talent in the future should keep. Computational thinking is a serial process in which a problem is defined in context of computing, stages of abstraction are processed in order to find the efficient solution, the most appropriate process and resources for a solution are selected and combined through algorithms which use various concepts, principles and methods for automatic implementation of abstract concepts. It needs appropriate learning content in stage of elementary school. This study has verified the effect it made on improvement of learner's creative personality by developing and applying the educational content for software education based on the integrative production. The result of study confirmed that learning through the educational content for software education based on the integrative production affects improvement on learner's creativity positively and suggested a method of applying it to computing education in elementary school.

• Journal of Bio-Environment Control
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• v.17 no.2
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• pp.110-115
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• 2008

To evaluate growth chracteristics, vitamin C content and antioxidative activity of Sedum sarmentosum, 13 local strains were cultivated in the field. Keumsan, Bucheon, and Pocheon strains had narrow and oblong leaf, long hight, and slender stem compared to the other strains. Wanju and Gunsan strains were not formed flower stalks, and did not flower during the flowering time. Vitamin C contents were ranged from 407.8 to $434.4\;mg{\cdot}kg^{-1}$, and it was high in Gwangyang, Buan, Wanju, and Gunsan strains. But vita min C contents didn't show a significant difference among strains. In antioxidative activity between fresh and freeze dried shoots, electron donating abilities (EDA) were ranged from 45.0 to 66.5% in MeOH extract of fresh shoot, and from 61.3 to 66.5% in MeOH extract of freeze dried shoot. Gwangyang, Suncheon, Wando strains showed high EDA compared to the others. Vitamine C content and antioxidant activity were highest in Gwangyang strain.

• Journal of the Microelectronics and Packaging Society
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• v.10 no.3
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• pp.73-82
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• 2003

Recently, PWB(Printed Wiring Board) has been recognized in the field of microelectronic package as core technology for designing or manufacturing. PWB is the structure stacked by several materials with different thermophysical properties, which shows the different CTEs(Coefficient or Thermal Expansions) during the fabrication process and causes a lot of defects such as warpage, shrinkage, dimension, etc. Thermal deformation of PWB is affected mainly by the volume change of solder-resist among fabrication parameters. Therefore, thermal deformation of PBGA and CSP consisting of 2 layers and 4 layers was studied with solder-resist process. When over 30% in volume fraction of solder-resist, thermal deformation of 2-layered PWB was min. 40% higher than that of 4-layered PWB because 4-layered PWB contained the layer with high toughness such as prepreg, which counterbalanced the thermal deformation of solder-resist. Otherwise, when below 30%, PWB showed similar thermal deformation without regard to layers and design.

• The Journal of Korean Association of Computer Education
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• v.17 no.6
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• pp.9-20
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• 2014

With the change of global awareness of Computing education and introspection about Computer education focused on ICT literacy, efforts are being made to reflect computational thinking in the new curriculum. But if computational thinking would be possible at school, it require tremendous cost to prepare computers for school. In this study, we investigate potentiality and constraints of the one board computer to teach computational thinking in school. We study fundamental performance, application of physical computing and programming education, maintenance of the computers, power consumption of the one board computers which is raspberry pi, beagle bone black, and pcduino3. The result of the study show that one board computer can substitute desktop of the school unless tasks related to require massive data storage and processing. We draw a conclusion that Pcduino3 is well-suited for computational thinking education.

• Journal of the Korea Society of Computer and Information
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• v.24 no.12
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• pp.209-216
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• 2019

In view of the educational effects and social changes of software education, equal opportunities for software education are needed regardless of general students and students with disabilities. However, studies on software education for general students have been actively conducted, but studies on software education for students with disabilities are insufficient. In this study, we developed a robot education software education program for students with developmental disabilities. Developing robot-enabled software education programs for students with developmental disabilities is meaningful in terms of expanding software education opportunities for all. In addition, the robot-based software education program is easy to motivate students with developmental disabilities with low task concentration, short-term memory, and low sociality. Significant changes will be made not only in terms of management capacity, but also in terms of self-efficacy and confidence.

• Journal of Haehwa Medicine
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• v.22 no.2
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• pp.67-79
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• 2014

In order to investigate the efficacy of BJBB on atopic dermatitis, various immune related factors were studied. The results and conclusions are as follows. Atopic dermatitis symptoms were improved in BJBB treated group and significant decrease in dermatitis index were observed in 13 weeks. ALT, AST and BUN, Cr levels were all with in the normal ranges in BJBB treated group, indicating no induced toxicity. BJBB treated group showed significant decrease in CD4+, CD11b+/Gr-1+ immune cell ratio in dorsal skin by 33% and 62% respectively. BJBB treated group showed significant decrease in the expression of IL-4, IL-5, IL-13 and histamine by 83%, 62%, 53% and 61% respectively. Also the group showed decrease in the transcription of IL-4, IL-5 and IL-13 mRNA in spleen by 41%, 52% and 50% respectively. BJBB treated group showed decrease in the expression of IgE by 57% respectively. The results above indicated that treatment of BJBB improved atopic dermatitis symptoms by immune modulation activity a clinical evidence. thus, BJBB has a potential use as a composition of medicinal plants for treatment against inflammation related disease.

• Journal of the Earthquake Engineering Society of Korea
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• v.9 no.6 s.46
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• pp.75-90
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• 2005

This paper proposes semi-active fuzzy control technique of magneto-rheological dampers for seismic response control of cable-stayed bridges. Through the fuzzy inference process, the proposed technique performs the semi-active control with the responses of MR dampers only. Moreover, differently from the conventional semi-active control technique, this technique does not require additional active controller for the primary controller, which provides a simple design process. in order to validate the control performance of the proposed technique, the semi-active fuzzy control technique is applied to the benchmark control problem of cable-stayed bridge and its control performance is compared with those of conventional semi-active control techniques. The comparative results show that the proposed fuzzy control technique can be an effective control strategy by efficiently and simultaneously reducing the mutual conflicting responses such as the shear forces and moments at the base of the lowers, longitudinal displacement of the deck, and tensions in the stay cables.

• Korean Journal of Plant Taxonomy
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• v.44 no.4
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• pp.288-297
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• 2014

The aim of this study is to analyse misinformation about gymnosperm taxon used for over 57 years, since 1957 when plant biology as a discipline was established in our country. That is, terminologies and descriptions of the reproductive structure (flower) of angiosperms (flowering seed plants) have been incorrectly applied to the reproductive structures (typically cones and pollen grain) of gymnosperms (non-flowering seed plants) by numerous and various media such as text books, dictionaries, and internet websites for plant biology. Thus, these resources have been misleading teachers, students, and other people interested in plant biology in general and taxonomy in particular by describing gymnosperm reproductive structures as if they are the same as angiosperms. Such a practice has an especially adverse effect on plant biology education at all levels of instruction, with teachers and students confused in their understanding of the concept and definition of a flower. In this paper, these incorrect expressions for the reproductive structures of gymnosperms from the various media are analysed and discussed in terms of cladogram, anatomy of reproductive structures, and historical context of classification systems.

• Journal of the korean academy of Pediatric Dentistry
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• v.27 no.2
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• pp.222-228
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• 2000

Ectodermal dysplasia is a hereditary disease characterized by a congenital dysplasia of one or more ectodermal structures and their accessory appendages. At least 120 subtypes of ectodermal dysplasia have been reported. The disease is usually transmitted as an X-linked recessive trait in which the gene is carried by the female and manifested in the male. Hypohidrotic ectodermal dysplasia is manifested as a triad of defects that include hypohidrosis, hypotrichosis and hypodontia. The characteristic facial features consist of asteatosis, onchodysplasia, sparse and fine blond hair, prominent forehead, a depressed nasal bridge, thick everted lips. The patient may suffer from dry skin, hyperthermia and unexplained high fever as a result of the deficiency of sweat glands. This case report presents detailed procedures of rehabilitating functional and esthetic defect of a 6-year-old boy with hypohidrotic ectodermal dysplasia along with the review of relevant literatures.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.175-178
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• 2008

Z. Cao had proposed NFRM(new fuzzy reasoning method) which infers in detail using relation matrix. In spite of the small inference rules, it shows good performance than mamdani's fuzzy inference method. But the most of fuzzy systems are difficult to make fuzzy inference rules in the case of MIMO system. The past days, We had proposed the MIMO fuzzy inference which had extended a Z. Cao's fuzzy inference to handle MIMO system. But many times and effort needed to determine the relation matrix elements of MIMO fuzzy inference by heuristic and trial and error method in order to improve inference performances. In this paper, we propose a MIMO fuzzy inference method with the learning ability witch is used a gradient descent method in order to improve the performances. Through the computer simulation studies for the inverse kinematics problem of 2-axis robot, we show that proposed inference method using a gradient descent method has good performances.