• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.77-80
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• 2001

To research the ametropia in the west seoul, 510 eyes were tested by the object and subject methods. The results were as follows. 1. Among the 510 eyes, myopia is 71.9%, hypropia is 22.1%, and emmetropia is 5.8%, respectively. 2. In test over the 20 ages, myopia is 66.9%, hypropia is 7.1%, and emmetropia is 23%, respectively. 3. In test under the 20 ages, myopia is 76.6%, hypropia is 3.8%, and emmetropia is 19.6%, respectively.

• Journal of the Korean Wood Science and Technology
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• v.42 no.5
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• pp.510-515
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• 2014

The anatomical and physical properties of tension wood (TW), opposite wood (OW) and lateral wood (LW) in the branches of Korean paulownia (Paulownia coreana) were compared. The diameter of TW vessels was larger than that of OW and LW vessels. The most distinctive feature of TW fibers was the presence of a gelatinous layer (G-fiber). The cell wall of TW fibers was nearly three times as thick as that of OW and LW. TW differed from OW and LW in density, X-ray diffraction pattern and shear and compressive strengths. The results obtained in this study showed clear differences in the anatomical and physical properties of TW, OW and LW of Paulownia coreana branch woods.

• Journal of the Korean Ceramic Society
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• v.46 no.5
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• pp.510-514
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• 2009

The microstructure and mechanical behavior of deformed silicon were characterized using transmission electron microscopy and nanoindentation. Structural defects such as stacking faults and dislocations were observed through the diffraction contrast in transmission electron microscopy. The mechanical properties of deformed Si and 111 Si wafer and mechanical behaviors during contact loading were also characterized using nanoindentation. The hardness values of silicon samples were ${\sim}10$ GPa and the elastic modulus were varied with indentation conditions. Elbow or pop-out behaviors were found in load-displacement curves of silicon samples during nanoindentation. Deformed silicon showed 'pop-out' behavior more frequently under the load of 10 mN, which is attributed to the structural defects in deformed silicon.

• Polymer Science and Technology
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• v.17 no.4
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• pp.493-510
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• 2006

• Journal of Electrical Engineering and Technology
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• v.4 no.4
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• pp.510-514
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• 2009

This paper presents the coupled analysis method to calculate the temperature rise in a gas insulated busbar (GIB). Harmonic eddy current analysis is carried out and the power losses are calculated in the conductor and enclosure tank. Two methods are presented to analyze the temperature distribution in the conductor and tank. One is to solve the thermal conduction problem with the equivalent natural convection coefficient and is applied to a single phase GIB. The other is to employ the computational fluid dynamics (CFD) tool which directly solves the thermal-fluid equations and is applied to a three-phase GIB. The accuracy of both methods is verified by the comparison of the measured and calculated temperature in a single phase and three-phase GIB.

• Journal of the Korean Society for Precision Engineering
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• v.29 no.5
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• pp.510-515
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• 2012

Feed drive systems are used to position the machine tool components carrying the cutting tool and workpiece to the desired location. Hence, their positioning accuracy and speed determine the quality and productivity of machine tools. In this paper, technical trend of machine tools feed drive systems are analyzed by patent mapping. And this paper suggested future development direction of feed drive systems. The analysis is carried out by using problem solution map (PSM) for the applied patent during January 2000 and December 2009 in Korea, Japan, EU and U.S.A.

• Journal of Physiology & Pathology in Korean Medicine
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• v.29 no.6
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• pp.510-516
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• 2015

The purpose of this study is to present the two treatment case of patient with dysfunctional uterine bleeding. Each patient has received the Korean Medicinal treatment including acupuncture, moxibustion, and herbal medication twice a week for a month or six months. This efficacy of treatment was evaluated with the degree of bleeding by the number of pad used per day. After finishing treatment, two patients had stopped bleeding, and their menstrual cycle returned to the normal range. Moreover, additional clinical manifestations including leukorrhea, hot flush, bloating, feeling tired and irritability which refers to the premenstrual syndrome were also alleviated. This case report showed that the acupuncture, moxibustion, and the herbal medicinal treatment can be effective for the treatment of the dysfunctional uterine bleeding.

• International Journal of Aeronautical and Space Sciences
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• v.16 no.4
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• pp.510-519
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• 2015

Concerning the issue of high-dimensions, hybrid uncertainties of randomness and intervals including implicit and highly nonlinear limit state function, reliability analysis based on the hybrid uncertainty reliability mode combining with back propagation neural network (HU-BP neural network) is proposed in this paper. Random variables and interval variables are as input layer of the neural network, after the training and approximation of the neural network, the response variables are obtained through the output layer. Reliability index is calculated by solving the optimization model of the most probable point (MPP) searching in the limit state band. Two numerical cases are used to demonstrate the method proposed in this paper, and finally the method is employed to solving an engineering problem of the aerospace friction plate. For this high nonlinear, small failure probability problem with interval variables, this method could achieve a good analysis result.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.510-512
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• 2014

Malware Analysis tools are being main topic research for many mobile security companies, in this survey, we are trying to go through the most popular tools used to find out the malicious codes and suspected android programs through reverse engineering process. There are so many malware tools have been made and implemented and some of them are efficient enough and others are quite slow and consuming high processing, however we are going to compare briefly some of them.

• Environmental Analysis Health and Toxicology
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• v.30
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• pp.17.1-17.6
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• 2015

Objectives In this study, the possibility of using existing test data provided in Korea and elsewhere for the registration of chemical substances was examined. Data on 510 chemical substances that are among the first subject to registration under the "Act on the Registration and Evaluation, etc. of Chemical Substances (K-REACH)" were analyzed. Methods The possibility of using existing data from 16 reference databases was examined for 510 chemical substances notified in July 2015 as being subject to registration. Results Test data with the reliability required for the registration of chemical substances under the K-REACH constituted 48.4% of the required physicochemical characteristics, 6.5% of the required health hazards, and 9.4% of the required environmental hazards. Conclusions Some existing test data were not within the scope of this research, including data used for registration in the European Union (EU). Thus, considering that 350 of these 510 species are registered in EU Registration, Evaluation, Authorisation & Restriction of Chemicals, more test data may exist that can be utilized in addition to the data identified in this study. Furthermore, the K-REACH states that non-testing data (test results predicted through Read Across, Quantitative Structure-Activity Relationships) and the weight of evidence (test results predicted based on test data with low reliability) can also be utilized for registration data. Therefore, if methods for using such data were actively reviewed, it would be possible to reduce the cost of securing test data required for the registration of chemical substances.