• Journal of the Korean Geotechnical Society
• /
• v.36 no.11
• /
• pp.119-133
• /
• 2020

Underground utility tunnel, the most representative cut and cover structure, is subjected to seismic force by displacement of the surrounding soil. In 2020, Korea Infrastructure Safety Corporation has published "Seismic Performance Evaluation Guideline for Existing Utility Tunnel." This paper introduces two seismic evaluation methods, RDM (Response Displacement Method) and RHA (Response History Analysis) adopted in the guide and compares the methods for an example of an existing utility tunnel. The test tunnel had been constructed in 1988 and seismic design was not considered. RDM is performed by single and double cosine methods based on the velocity response spectrum at the base rock. RHA is performed by finite difference analysis that is able to consider nonlinear behavior of soil and structure together in two-dimensional plane strain condition. The utility tunnel shows elastic behavior for RDM, but shows plastic hinge for RHA under the collapse prevention level earthquake.

• Journal of Information Technology Applications and Management
• /
• v.16 no.4
• /
• pp.93-107
• /
• 2009

This study investigated consumer preferences for Internet medical information service in China using the multi-attribute utility theory. The multi-attribute utility theory is a compositional approach for modeling consumer preferences wherein researchers calculate the overall service utility by summing up the evaluation results for each attribute. We found that Chinese Internet medical information users consider the availability of information and quick response to be the most important attributes. Further, they think that the comment feature is less important as compared to other attributes such as costs and updates. In addition, we found that the Internet users having more Internet experience consider these attributes to be more important as compared to the people who are just beginning to surf the Internet. For any successful Internet business, Internet marketers should assess individual-level preference and accordingly organize a fresh campaign. As of now, Internet marketers need estimation methods to predict the market performance of new services in many different business environments. We believe that the multi-attribute utility theory is a useful approach in this regard.

• Journal of Korea Technology Innovation Society
• /
• v.3 no.2
• /
• pp.48-60
• /
• 2000

An effort has been made in this paper to measure the project manager's reaction to R&D project evaluation and present the useful information related to rebuilding an R&D evaluation system. Results of this study show that project manager's reaction is related to the selection of reasonable items for evaluation, the rater's expertise, the project manager's participation in evaluation process and so on. Accordingly, managers of the research institute have to set up the evaluation system after deeply considering these results.

• Korean Journal of Construction Engineering and Management
• /
• v.21 no.4
• /
• pp.100-107
• /
• 2020

In this paper, a study was conducted on the method of establishing the master plan standard for rational decision-making about utility tunnel construction in the existing urban. In the previous study, the optimal route was selected by the feasibility assessment. However, in order to increase the objectivity of the installation conditions of the utility tunnel in the master plan standard, comprehensive evaluation of the results by feasibility and economics analysis calculates the overall ranking for all sections analyzed. In addition, based on the results of the comprehensive evaluation, a method for establishing a mid·long term investment plan was introduced after reviewing the project to be conducted in the region. Additionally, in order to review the establishment of the standard suggested in the paper, an analysis was conducted by applying the master plan procedure to the northwestern urban zone of seoul.

• Journal of Korean Home Economics Education Association
• /
• v.15 no.4
• /
• pp.87-103
• /
• 2003

This study aimed to research the cognition of Technologyㆍ Home Economics curriculum by the middle and high school students in Kyungnam area. Data were collected from 646 middle school students and 589 high school students by the self-questionnaire. The results were following; 1. The overall cognition of TechnologyㆍHome Economics were evaluated lower middle school students than high school students, especially the variety of lessons the lowest. The variety of lessons and satisfaction was correlated highly. 2. The practices of lessons were more frequently Home Economics than Technology. The most complains were the insufficiency of interests and practice lessons. 3. The overall evaluation of subject´s matters and subject´s goals were highly positive levels, but the item of the interrelatedness of Technology and Home Economics was a little low level. 4. The utility and the importance of subject´s matters were evaluated higher the Home Economics and Computer than Technology revealed sex differences obviously.

• Journal of the Korean Society for Library and Information Science
• /
• v.33 no.2
• /
• pp.69-88
• /
• 1999

Despite the continuous development and provisions of state public library standards there has been little research about how useful they are for what aspects of public library activities The purposes of the present study are 1) to understand, from the directors points of view the utility of state standards for planning and evaluation: and 2) to explore the types of factors, related to the directors' backgrounds and/or the library planning and evaluation contexts associated with the directors perceptions. Through a self-administered mail questionnaire, 1,198 public library directors in Kansas Texas and Wisconsin were surveyed. and 737 directors replied ($61.5\%$ response rate). The directors perceived the standards useful for both planning and evaluation. Public library directors viewed the collection and service standards as more useful than administration, staffing and facilities standards. Library size and community involvement were associated with the directors perceptions, yet the directors professional background, was not significantly related to his or her perceptions. The findings suggest that public library directors perceptions of the utility of state standards need to be understood within the library condition and Its community context. and the emphasis on community based public library planning and evaluation should continue to be employed in the standards.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.21 no.1
• /
• pp.61-77
• /
• 2019

If a new utility tunnel is planned for high density existing urban areas in Korea, a rational decision-making process such as the determination of optimum design capacity by using the feasibility evaluation system based on quantitative evaluation indexes and the economic evaluation is needed. Thus, the previous study presented the important weight of individual higher-level indexes (3 items) and sub-indexes (16 items) through a hierarchy analysis (AHP) for quantitative evaluation index items, considering the characteristics of each urban type. In addition, an economic evaluation method was proposed considering 10 benefit items and 8 cost items by adding 3 new items, including the effects of traffic accidents, noise reduction and socio-economic losses, to the existing items for the benefit cost analysis suitable for urban utility tunnels. This study presented a quantitative feasibility evaluation method using the important weight of 16 sub-index items such as the road management sector, public facilities sector and urban environment sector. Afterwards, the results of quantitative feasibility and economic evaluation were compared and analyzed in 123 main road sections of the Seoul. In addition, a comprehensive evaluation method was proposed by the combination of the two evaluation results. The design capacity optimization program, which will be developed by programming the logic of the quantitative feasibility and economic evaluation system presented in this study, will be utilized in the planning and design phases of urban community zones and will ultimately contribute to the vitalization of urban utility tunnels.

• Journal of Aerospace System Engineering
• /
• v.6 no.2
• /
• pp.1-6
• /
• 2012

On this study, as a Human Factor(HF)'s point of view, typical PVI(Pilot Vehicle Interface) evaluation for small airplane cockpit design, PVI evaluation items and procedures to show compliance to KAS Part 23 "Airworthiness Standards : Normal, Utility, Acrobatic, And Commuter Category Airplanes" are introduced and reviewed. This study is based on the experience of Korean small civil airplane development and certification program.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.21 no.2
• /
• pp.26-32
• /
• 2013

The rotorcraft makes lift and control forces by the rotor thrust. At the development phase of the rotorcraft, the operational limitations have to be established. And it shall be demonstrated to operate the rotorcraft safely within the limitations. This paper introduces establishment and evaluation results of operational rotor speed limitations for the medium class utility rotorcraft. And it shows the follow-up activities after design changes of rotor speed indicators and aural warning systems for implementing the rotor speed limitations.

• Journal of KIISE:Computer Systems and Theory
• /
• v.34 no.2
• /
• pp.65-72
• /
• 2007

As embedded system has strict cost and space constraints, it is impossible to apply conventional fault-tolerant techniques directly for increasing the dependability of embedded system. In this paper, we propose software fault-tolerant mechanism which requires only minimum redundancy of system component. We define an utility metric that reflects the dependability of each embedded system component, and then measure the defined utility of each reconfiguration combinations to provide fault tolerance. The proposed utility evaluation process shows exponential complexity. However we reduce the complexity by hierachical subgrouping at the software level of each component. When some components of embedded system are tailed, reconfiguration operation changes the system state from current faulty state to pre-calculated one which has maximum utility combination.