• The Journal of Korean Academy of Prosthodontics
• /
• v.37 no.5
• /
• pp.651-657
• /
• 1999

This study was performed to investigate the retrievability of the cementation type implant abutments. The cements used in this study were Cavitec, Tembond and Zinc Phosphate Cement. The types of surface conditioning were no treatment, 50 microne sandblasting, 250 microne sandblasting, fine diamond finishing point and coarse diamond point. The retention of cast crown was measured with Instron Universal Testing Machine(Instron Engineering Co., U.S.A.). The results were as fellows: 1. The Maximium retention was obtained by the group of Z.P.C. cementation and Coarse diamond point surface conditioning. 2. Z.P.C. shows maximum retention, and reduced in orders Tembond, Cavitec, No cement. 3. The value of retention of surface condition was highest in coarse diamond point, lowest in no tretment. 4. The similar results were obtained between fine diamond point and 50 microne sandblasting, coarse diamond point and 250 microne sandblasting. 5. The were no direct corelation between mechanical retention and cementation retention.

• International Journal of Internet, Broadcasting and Communication
• /
• v.9 no.4
• /
• pp.14-18
• /
• 2017

In this paper, an contemplate the direction for Usable Security in IT security and User Experience. To evaluate how the user interface is convenient to use, we examine the components such as the property, learnable property, memory simplicity, faults and satisfaction level. By considering for the security, we should bring positive effects on the user experience. By emphasizing usability and security at the same time, we should increase the satisfaction level of the user experience and then produce the valuable experience through participation, use and observation. The positive user experience is the important task for the software engineering, business administration and others., and this will result satisfaction of the users, brand trust, and success in the market. On the other hand, for the negative user experience, the users cannot achieve their desired goal and therefore, are unsatisfied due to emotional, rational and economic inconvenience. Due to this, we should try to maintain a certain level of usability and security of the system in IT security and User Experience.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.10 no.5
• /
• pp.125-130
• /
• 2011

The characteristics of unsteady combustion were experimentally investigated using confined premixed flames stabilized by a rearward-facing step. The unsteady combustion used in this experiment plays an important role in controlling self-excited combustion oscillations and it has usually desirable performance such as high load combustion and low pollutant emission. It is known that combustion oscillation is occurred if Rayleigh's criterion is satisfied. The pressure fluctuation and OH-emission fluctuation were measured using pressure transducer and OH optical fiber respectively and then cross-corelation and phase difference were calculated to apply Rayleigh's criterion.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2010.04a
• /
• pp.16-23
• /
• 2010

This research analyzed about inconsistence and cause of the audit result on national defense quality management system in certification company. Direction of research analyzes corelation with distribution by items at national defense quality management system standard by Investigated number and occurrence of examination report slight and critical incongruity on 2008 and 2009. Study finding slight and critical incongruity happened to first examination average 10.2 items, renewal examination average 7.0 items. By incongruity occurrence appeared high in item that there are a lot of examination item shares of standard requirement, it was studied by correlative thing between the examination with standard. Factor of incongruity occurrence was proved to comprehension insufficiency for quality management system, quality procedure insufficiency, didn't fulfil proceedings, business was unripe. In this papers, we contribute to propose direction for improvement of national defense quality management system comprehensive faculty elevation and national defense quality certification in this treatise.

• Journal of Korean Society of Water and Wastewater
• /
• v.21 no.6
• /
• pp.701-707
• /
• 2007

The information on the incoming load to wastewater treatment plants is not often available to apply to evaluate effects of control actions on the field plant. In this study, a time series model was developed to forecast influent flow rate, BOD, COD, SS, TN and TP concentrations using field operating data. The developed time series model could predict 1 day ahead forecasting results accurately. The coefficient of determination between measured data and 1 day ahead forecasting results has a range from 0.8898 to 0.9971. So, the corelation is relatively high. We made forecasting program based on the time series model developed and hope that the program will assist the operators in the stable operation in wastewater treatment plants.

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.31A no.9
• /
• pp.1-9
• /
• 1994

Through the low orbit GPS satellite for a 3-dimensional real time position detechtion can be achieved anywhere. Utilizing the GPS sate llite detection values an analysis of the varing characteristics of the ionosphere can be achieved, and by calculating the correlation relationship of the position detection error and the ionospheric time delay characteristics, an advanced algorithm technique can be developed. Computer simulation of the developed algorithm for defining the corelation between the position detection error and the varing ionospheric time delay charcteristics has been proceeded. The results of simulation reveal the fact that the varing characteristics of the ionosphere nearly match the actual ionospheric time delay characteristics.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.2007-2009
• /
• 2008

본 논문에서는 인체에 열을 가했을 때 심전도(ECG) 신호에서 얻어진 Heart Rate Variability(HRV)와 광전용적맥파(PPG)에서 얻어진 Photoplethymograph Variability(PV)의 상관관계를 보기 위하여 피실험자가 상온에서 누워 있을때와 65$^{\circ}C$의 온도로 누워있을때의 심전도와 PPG를 측정하여 두 파라메터의 상관관계를 분석하여 그 효용성을 평가하였다. 이를 위하여 우선 신체 건강한 26세에서 32세까지 총 3명의 남성을 대상으로 하여 ECG와 PPG를 위와 같은 조건에서 측정한 다음, 두 신호로부터 피크를 검출하고, 피크 간격을 시계열 신호로 변환하여 HRV와 PV신호를 얻어 내었다. 또한 얻어진 HRV신호와 PV신호의 주파수 분석을 통하여 HF 및 LF성분을 비교하여 HRV와 PV의 상관관계를 비교하였다.

• Herbal Formula Science
• /
• v.16 no.2
• /
• pp.155-162
• /
• 2008

Objectives : The present study was designed to investigate corelation between mix proportion of Scutellaria baicalensis (SB) and Coptis chinensis (CC) on lipopolysaccharide (LPS)-induced TYPE-1 interferon production. Methods : I examined TYPE-1 interferon, interferon regulating factor (IRF)-1,7 and interleukin(IL)-10 production on LPS-induced RAW264.7 cells to evaluate inhibitory effect of mix proportion of SB and CC using real time PCR. Results : Mixture of SB and CC regulated TYPE-1 interferon and IRF-1,7 mRNA expression with SB dose dependent manner, while maintained IL-10 mRNA expression on LPS-induced RAW264.7 cells. Conclusion : In mixture of SB and CC, SB plays a key role in reducing TYPE-1 interferon through inactivation IRF-1,7. Furthermore mixture of SB and CC maintained IL-10 mRNA level. Collectively, this results suggest that SB confer beneficial effects in autoimmune diseases clinically.

• Proceedings of the KAIS Fall Conference
• /
• 2010.05b
• /
• pp.1053-1056
• /
• 2010

이 연구는 중고등학생들의 혈액형이 뇌 기능 및 좌우뇌선호도와 관계가 있는지를 개인이 지닌 뇌신경 생리학적 지표인 뇌파 측정을 이용하여 비교 하여 보았다. 대상자는 2005년 9월에서 2008년 12월까지 한국정신과학연구소에 뇌파측정 의뢰한 중고등학생을 기준으로 선정한 자료이다. 중학생 여 628 남 1002 고등학생 여 213 남365 총 2208명이다. 중학생 혈액형 분포도는 A>B>O>AB형 순이었다. 분석의 결과 중고등학생의 혈액형과 좌우뇌선호도와는 무관 하였다. 그리고 혈액형과 중고등학생의 뇌 기능과도 무관하였다. 위의 결과를 종합하면 혈액형과 지능이나 성격을 함부로 연관 지어 편견이나 차별을 유도하는 것은 바람직하지 않다고 본다.

• Journal of the Korea Safety Management & Science
• /
• v.14 no.2
• /
• pp.103-112
• /
• 2012

The construction industry in Korea after the Korean-war has evolved until these days. But the construction industry accident severity rate and frequency is over then the All industry rate. This study analyzed the 'Disaster Statistical Yearbook' of the Korea Occupational Safety and Health Agency, based on the factors that affect construction accidents that is selected and fined the some factors the construction Disaster Prevention Factors. This study will develop the methodology for analyzes that the national qualification is effected to the construction industrial machine disaster prevention status. It suggest two ways to the establishment of disaster trends. First way is the disaster quantitative analysis and second way is comparing the statistical data and the analysis of expert opinion.