• Journal of the Korean Society of Safety
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• v.30 no.2
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• pp.9-13
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• 2015

This paper describes the analysis of deterioration characteristics for connection factor used in grounding system. The connection method of grounding system is specified in IEC standard. In order to analyze the deterioration characteristics for connection factor, deterioration test was carried out when the connection factor was buried in salt water and underground. The test connection factors were C-type sleeve, clamp, and exothermic welding. As a consequence, most of the connection factor was corroded, and the electrical resistance decreased after deterioration. The analytical results can be used to establish the safety of grounding system.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.35 no.5
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• pp.287-293
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• 2009

Cell survival is the result of a balance between programmed cell death and cellular proliferation. Cell membrane receptors and their associated signal transducing proteins control these processes. Of the numerous receptors and signaling proteins, epidermal growth factor receptor (EGFR) is one of the most important receptors involved in signaling pathways implicated in the proliferation and survival of cancer cells. EGFR is often highly expressed in human tumors including oral squamous cell carcinomas, and there is increasing evidence that high expression of EGFR is correlated with poor clinical outcome of common human cancers. Therefore, we examined the antiproliferative activity of gefitinib, epidermal growth factor receptor tyrosine kinase inhibitor (EGFR TKI), in head and neck cancer cell lines. SCC-9, KB cells were cultured and growth inhibition activity of gefitinib was measured with MTT assay. To study influence of gefitinib in cell cycle, we performed cell cycle analysis with flow cytometry. Western blot was done to elucidate the expression of EGFR in cell lines and phosphorylation of EGFR and downstream kinase protein, Erk and Akt. Significant growth inhibition was observed in SCC-9 cells in contrast with KB cells. Also, flow cytometric analysis showed G1 phase arrest only in SCC-9 cells. In Western blot analysis for investigation of EGFR expression and downstream molecule phosphorylation, gefitinib suppressed phosphorylation of EGFR and downstream protein kinase Erk, Akt in SCC-9. However, in EGFR positive KB cells, weak expression of active form of Erk and Akt and no inhibitory activity of phosphorylation in Erk and Akt was observed. The antiproliferative activity of gefitinib was not correlated with EGFR expression and some possibility of phosphorylation of Erk and Akt as a predictive factor of gefitinib response was emerged. Further investigations on more reliable predictive factor indicating gefitinib response are awaited to be useful gefitinib treatment in head and neck cancer patients.

• The Journal of the Korea Contents Association
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• v.11 no.11
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• pp.79-90
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• 2011

The purpose of this study is to explore physical factor of digital text structure for designing e-Book interface and to develop prototype of e-Book interface by applied these factors. To address this goal, explore factor analysis and confirmatory factor analysis were employed, 237 university students were the participated in this study. According to a result, 29 items for physical feature of digital text structure were developed, 9 factors of digital text structure were also extracted; volume, depth, density, space, layout, format, signal, size, and length. Besides, to identify structure of pre-defined 9 factors, confirmatory factor analysis was conducted. As a result of CFA, the factor structure was supported by all of model fit indices.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.3
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• pp.1284-1287
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• 2012

In this study, we propose the structures of octagonal spiral planar inductors without underpass and via, and confirm the frequency characteristics. The structures of inductors have Si thickness of $300{\mu}m$, $SiO_2$ thickness of $7{\mu}m$. The width of Cu coils and the space between segments have $20{\mu}m$, respectively. The number of turns of coils have 3. The performance of spiral planar inductors was simulated to frequency characteristics for inductance, quality-factor, SRF(Self- Resonance Frequency) using HFSS. The octagonal spiral planar inductors have inductance of 2.5nH over the frequency range of 0.8 to 1.8 GHz, quality-factor of maximum 18.9 at 5 GHz, SRF of 11.1 GHz. Otherwise, square spiral planar inductors have inductance of 2.8nH over the frequency range of 0.8 to 1.8 GHz, quality-factor of maximum 18.9 at 4.9 GHz, SRF of 10.3 GHz.

• Korean Journal of Materials Research
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• v.13 no.6
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• pp.360-364
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• 2003

$Sr_{l}$ $\pm$x/$Bi_{2}$ $\pm$y/$Ta_2$ $O_{9}$ and $Sr_{l}$ $\pm$$Bi_{x}$ $2\pm$y$Nb_2$$O_{9}$ ceramics were prepared by a solid state reaction method. X-ray diffraction analysis indicated that single-phase of Bi-layered perovskite was obtained. According to Sr/Bi content ratio, Curie temperature( $T_{c}$), electromechanical factor($K_{p}$ ) and mechanical quality factor($Q_{m}$ ) were measured. The Curie temperature of SBN(SBT) rose from $414^{\circ}C$(314$^{\circ}C$) to $494^{\circ}C$(426$^{\circ}C$) when Sr/Bi content ratio was increased. In the case of Sr/Bi content ratio = 0.55/2.3, the maximum value of the mechanical quality factor $Q_{m}$ of SBT and SBN were obtained 3320 and 1010, respectively.

• The Research Journal of the Costume Culture
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• v.9 no.2
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• pp.319-332
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• 2001

This study attempts to measure body sizes and somatotypes of 844 female middle and high students girls in their growth period and to investigate characteristics of each of the measured somatotypes. The data used for this study were 50 items of body sizes obtained from anthropometric measurements. The purposes of the study are as follows: 1. to analyze physical characteristics according to age. 2. to extract factors of somatotypes using factor analyses. 3. to classify somatotypes according to physical characteristics using cluster analyses. The study results were as follows: 1. TH anthropometric measurements indicated that three existed collective patterns of somatotypes across Group I(12∼13 years old), Group II(14∼15 years old), and Group III(16∼18 years old). 2. Through factor analyses, 6 factors were yielded from each age group. The cumulative proportions of these factors were 77% for Group I, 75% for Group II, and 72% for Group III. Factor I indicates a horizontal size factor and Factor 2 indicates a vertical size factor. 3. Group I and Group II ere classified into 5 types and Group III was classified as 3 types. In Group I, middle height and a little slim types were most prevalent(28%). In Group II, low height and very slim types were most prevalent(28.9%). Finally, In Group III, low height and slim types were most prevalent(4.6%)

• The Journal of Asian Finance, Economics and Business
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• v.9 no.7
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• pp.93-99
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• 2022

Nowadays, learning management systems (LMS) are an effective and efficient tool for providing students with a high-quality education. The current study examines the effect of different factors on the use of the blackboard application on mobile phones. The study selects four important factors after factor analysis, such as facilitating factor, performance factor, satisfaction factor, and difficulties factor. The data was collected through a structured questionnaire from 45 students as a sample in the college of business administration at Prince Sattam Bin Abdulaziz University. The study uses a logistic regression model to examine the empirical relationship between LMS adoption and different factors associated with blackboard adoption. The results show that 71 percent of the respondents are between the age of 18-20 years, and 100 percent of students have experience in using blackboard. The empirical results show that the satisfaction factor is positive and significant at the 10 percent level of significance and the difficulties factor is also positive and significant at the 1 percent level of significance. The results conclude that the students are satisfied with using the blackboard on mobile, nevertheless, the difficulties factor which is positive and significant shows that students are facing some difficulties in using the blackboard on their mobile.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.66 no.4
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• pp.219-223
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• 2017

In this paper, we calculated the losses in the high voltage lines of power distribution system. The losses caused by high voltage lines are calculated using maximum current, resistance, loss factor, and dispersion loss factor. The accurate extraction of these factors are very important to calculate the losses exactly. Thus, the maximum loads are subdivided to regions and calculated monthly for more accurate maximum current calculation. Also, the composite resistance is calculated according to the ratio of the used wire types. In order to calculate the loss factor, the load factors according to the characteristics of each region were calculated. Finally, the losses of the distribution system is calculated by adding the losses by the transformers and the low voltage lines.

• Journal of Digital Convergence
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• v.9 no.1
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• pp.71-87
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• 2011

Currently, many companies are interested in (Radio Frequency Identification (RFID). Nonetheless, technical imperfection and the uncertainty of Return on Investment (ROD is discouraging the companies' intention to implement RFID. Accordingly, while a number of companies concede the efficiency of RFID, few of them expresses enthusiasm, making a rain check to adopt RFID. Moreover, the recent economic depression has down-sized the companies' investment on Information Technology (IT), subsequently hindering RFID implementation. In adopting RFID, the collaboration of supply chain is the most importance factor. Therefore, in implementing RFID, many companies reinforced collaboration of supply chain. Therefore, this study will focus on performing an analysis on several factors which influence the intention to adoption of RFID, such as the human factor, technology factor, vender factor and task factor. The results of this study will provide useful guidelines for RFID adoption strategy to Korean companies.

• Korean Journal of Adult Nursing
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• v.27 no.1
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• pp.39-51
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• 2015

Purpose: The purpose of this study was to develop and validate a Hospital Violence Attitude Scale-18 (HVAS-18) for clinical nurses. Methods: The HVAS-18 was developed and validated in 3 steps: Item generation through literature reviews and in-depth interviews, pilot study, and the validity and reliability tests using a test-retest technique. Forty-one items were initially extracted by 8 experts, and 18 items were finally developed by item and factor analysis. The final HVAS-18 was evaluated by 326 clinical nurses from seven general hospitals in three cities. The collected data were analyzed using factor analysis, Pearson correlation coefficient, and Cronbach's ${\alpha}$. Results: Five discrete factors emerged, which explained 64.0% of the total variance. Each five factor was labeled: Factor 1 (6 items) 'awareness'explained 18.2%; Factor 2 (4 items) 'response' explained 12.9%; Factor 3 (4 items) 'reaction' explained 12.9%; Factor 4 (2 items) 'result-nursing' explained 10.2%; and Factor 5 (2 items) 'result-violence offender' explained 9.6%. The internal consistency, Cronbach's ${\alpha}$, was .87, and reliability of the sub-scales ranged from .72 to .83. Conclusion: The results of this study indicate that HVAS-18 can be an useful, reliable, and valid instrument for measuring hospital violence attitude of clinical nurses.