• Journal of the Korean Society for Library and Information Science
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• v.47 no.1
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• pp.327-347
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• 2013

The use of the Internet is spread over all areas of our lives. However, its features raised serious social issues due to unethical behavior. To understand the level of Internet ethics among undergraduate students, a survey questionnaire of 31 questions regarding netiquette awareness, ethical norms, information credibility, and personal background is devised; data was collected from 830 students. Descriptive analysis shows low level of netiquette awareness, considerable deviation from six categories of ethical norms and problems of network information credibility. Results of statistical testing show gender and grade level as factors affecting Internet ethics. However, there is no significant difference in Internet ethics depending on related education experience. Based on the results, recommendations to promote Internet ethics are suggested.

• Journal of the Korean Geosynthetics Society
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• v.9 no.4
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• pp.17-25
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• 2010

Evaluation of stability in traditional designing of reinforced soil structures is executed by examination of internal and external stability. Analysis of internal stability is for pull-out and ductile strength. Analysis of external stability is for settlement, overturning and sliding. To minimize inherent uncertainties of soil properties and analytical model, reliability analysis was developed recently. In this study, reliability analysis method considering simultaneous failure probability for various failure mode of internal and external stability is proposed. By applying uni-modal bounds, Stability of system reliability of reinforced soil structures is evaluated by integrating multi failure mode for various analytical model. Because of complex consideration for various failure shapes and modes, it is possible to secure advanced safety by using simultaneous failure probability. And evaluation of reinforced soil structure is executed by representative index, simultaneous failure probability, than previous method.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.11
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• pp.139-147
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• 2016

This study described the design scheme for each step of the production test for the Fire Control System(FCS) of the K-55A1 PIP business of Hanwha Thales since 2011. From the time of receipt of the product It is necessary to improve the FCS's reliability by using the Unit Test, burn-In test, System Test. FCS of K-55A1 acts as a 'head' that control the self-propelled howitzer, and connected with the electrical and physical connection of self-propelled howitzer's multiple unit (Inertial navigation systems(IN), Muzzle Velocity Radar (MVR)) for the normal operation without an inch of error in operating. We designed the production testing equipment automatically as much as possible and designed with the environment similar to the self-propelled howitzer. by using this production testing equipment, It should help for the strengthen national defense of the Republic of Korea.

• Transactions of the KSME C: Technology and Education
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• v.1 no.1
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• pp.39-47
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• 2013

Top Drive Machine is drilling equipment which transfers motor torque to the drill bit. Kelly Rotary Table of the Derrick Drilling Machine (DDM) is firstly developed at 1983, and the first commercial model DDM 650DC was released at 1984. Offshore drilling business is high value-added industries. "N" Company of U.S.A and "A" company of Norway hold more than 90 percent of the global offshore drill system market, so it is hard to take away market share and develop offshore drilling equipment. Consequently, this paper introduce method for concept design of new reliability machine by limited information. To achieve this, design & analysis tools as CATIA, DELMIA, Pro Engineering, ANSYS were used to evaluate design error and strength/flow analysis at new concept design in Top Drive Machine.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.7
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• pp.537-546
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• 2020

The reliability used as a performance indicator during the development of space launch vehicle should be validated by the launch success probability, and the launch data need to be fed back for reliability management. In this paper, the launch data of space launch vehicles around the world were investigated and statistically analyzed for the success probabilities according to the launch vehicle models and maturity. The Bayesian estimation of launch success probability was reviewed and analyzed by comparing the estimated success probabilities using several prior distributions and the statistical success probability. We presented the method of generating prior distribution function and considerations for Bayesian estimation.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.6
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• pp.620-627
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• 2004

As h-bridge multilevel inverter is connected with series of single phase power cell, so it obtain high voltage using low voltage power semi-conductor and output voltage similar to sine wave. In this topology, the number of power cell increases in proportion to the output voltage level. Therefore, there are drawbacks that are responsibility against operating ability of main controller and signal wire increase. However, we can overcome this problems by the substitution of serial communication for the PWM signal in power cell control. Additionally, it has merits of reliability and maintenance. This paper deals with the synchronization and phase-shift method of power cell PWM using CAN(Controller Area Network) communication interrupt in H-bridge multilevel inverter. The advantages of proposed method are signal-line simplification using serial communication between main controller and cell controller, burden reduction in main controller, modularization of power cell, easy protection of each power cell, expandability improvement and reliability increase of control signal and power cell. This paper establishes propriety and reliability of proposed method through experiment of 13-level H-bridge multilevel inverter.

• International Journal of Highway Engineering
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• v.13 no.4
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• pp.71-79
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• 2011

Korean national highway has been increased 2 times more for the past ten years because of many highway geometric improvements and new routes since 2000. According to the reasons, maintenance cost has been increased continuously. Deterioration of concrete bridge decks caused by asphalt pavement deformation occupies a high proportion of overall bridge management budget. The number of current highway bridges has reached over 7,800 in 2011, and It is difficult to determine to some future budget. This study predicted the remaining life of concrete bridge decks using the reliability analysis based on Weibull distribution. and The expected future maintenance cost was estimated.

• Journal of Korean Society of Transportation
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• v.23 no.5 s.83
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• pp.83-92
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• 2005

The purpose of the paper is to analyze an effectiveness before and after implementation of the median arterial bus lanes operation. The paper includes a speed analysis based on the Downs-Thomson Paradox theory, and a reliability analysis based on variance analysis of arrival time. According to the speed analysis, some road sections are now under phase 2 according to the Downs-Thomson Paradox, which is a state in which the bus speeds are greater than the car speeds. In the future it is predicted that cars and buses will reach an equilibrium speed which is in phase 3 of the multi-modal equilibrium theory. According to the reliability analysis of arrival time at each bus stop, in roads of median arterial bus lanes. the variance of arrival time is generally smaller than after the scheme implemented in eight months later.

• Culinary science and hospitality research
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• v.16 no.3
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• pp.174-187
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• 2010

The purpose of this study was to examine the effect of franchisor's training on franchisee's trust and relationship satisfaction. In addition, it investigated the difference in the perception of franchisor's training system by the duration of the franchise contract and the frequency of franchisor's visiting. In order to carry out the empirical study, a questionnaire was distributed to franchisees from July 26 to September 1, 2009, and a total of 255 copies were returned and used for analysis. In analyzing the data, three factors of the franchisor's training were obtained: pre-training, franchisor training, and supervisor training. These three factors had a significant effect on franchisee's trust and satisfaction with the relationship. Also, There was significant differences among franchisor's training by duration of the franchise contract. The findings of the study suggested useful implications in the related industries.

• Culinary science and hospitality research
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• v.16 no.3
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• pp.188-204
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• 2010

This research aims at finding relationship marketing factors that have positive effects on customer long-term orientation concerning wine purchasing personnels of domestic dinging companies such as sommeliers and managers. By figuring out the qualities of relationship such as the roles of trust and commitment while long-term orientation is being developed, it also tries to help wine suppliers which have been having a hard time due to domestic market recession and tight competition develop marketing strategies for promotion. A survey of wine purchasing personnels and sommeliers who work for fine dining restaurants, casual dining restaurants and wine bars was conducted for 30 days from Jan. 15, 2010 to Feb. 13, 2010. The statistical packages of SPSS 15.0 statistical package and AMOS 7.0 ver were used to perform frequency analysis, reliability test, confirmatory factor analysis, and path analysis. The result shows that among relationship marketing factors, communication and seller expertise have a positive impact on long-term orientation through trust and affective commitment.