• KSCE Journal of Civil and Environmental Engineering Research
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• v.11 no.4
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• pp.171-187
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• 1991

In the present study, an analytical solution method is proposed for the seismic design of cantilever sheet pile walls and anchored sheet pile walls used in harbor construction. Seepage pressures, together with a change in magnitudes of effective horizontal soil pressures, are included in the proposed solution method. Also, the Mononobe-Okabe analysis as well as the Westergaard and Matsuo-Ohara theory of hydrodynamic pressures is used in the proposed method. Further, the choice of values for safety factors is examined for the seismic design of anchored sheet pile walls, and the effects of various parameters(dredge line slope, differential in water levels, anchor position, and wall friction angle) on embedment depth, anchor force, and maximum bending moment are analyzed for anchored walls in dense sand deposits. In addition. the tables that could be used for preliminary seismic design of anchored walls in dense sands are presented. The proposed method deals with the sheet pile walls with free earth support.

• Journal of Korean society of Dental Hygiene
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• v.9 no.1
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• pp.193-205
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• 2009

The purpose of this study was to examine the needs of learners in an advanced major course in a bid to strike a balance between theory and practice. And it's also meant to suggest an actual case of that effort in an advanced course. As a result of analyzing the collected data, the largest number of the learners who signed up for the advanced course chose that course to earn a bachelor's degree, and the second greatest group did that to bolster their expertise. The name of the college that offered that course (41.4%) had the most impact on their choice of it, followed by accessibility(28.6%). The most common thing they practiced in the oral health education course as one of major courses was forming a lesson plan, followed by teaching at schools and kindergartens, trial student teaching, producing PPT, making OHP materials, making a bulletin board and producing leaflets. During clinical activities for oral health education, the largest group considered it necessary to learn about more theories on educational psychology(54%), followed by the production of teaching media(29.9%) and teaching methods(25.3%). Likewise, the greatest group found it more necessary to practice educational psychology(42.5%), followed by the utilization of media(37.9%) and teaching methods(28.7%). An one-on-one interview was implemented before and after their classes to obtain more detailed information on their needs, and what their needs were in relation to the given curriculum was eventually confirmed, which made it possible to offer better education in response to their needs.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.23 no.2
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• pp.33-47
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• 2020

With population losses and stagnant or depressed economies, the local governments embrace shrinkage and accept having a significantly smaller population. Both the initial and ongoing causes of shrinkage hold dramatic effects on the city and its remaining residents. In this context, vacant land increases as an overabundance of unused infrastructure is demolished and municipalities become burdened with increasing maintenance costs of this land. The result is that vacant land often experiences minimal management relative to social norms and have chance to provide a setting for ecological processes with urban rightsizing strategy. Therefore, urban ecosystems undergo major shifts in structure and function. We need to better understand the possibilities of where and how much of houses and land will be abandoned to assist land planners and policymakers to mitigate conflict between optimal ecological and sociological outcomes. This article, therefore, aims to identify distributional characteristics of vacant houses and lands with case study of Mokpo. The study found and verified affecting factors of vacant houses and lands by type through the use of a Maxent model and spatial data that explained housing choice and preference theory. We can predict the vacancies with the spatial variables such as land price, the population ratio over 65, and the distance from security facility. Based on the analysis, the ways of managing housing and land vacancy for sustainable development and ecological restoration method are discussed.

• Journal of the Korean Operations Research and Management Science Society
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• v.34 no.4
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• pp.185-204
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• 2009

The USIM(universal subscriber identity module)-unlock introducing in July 1, 2008 might be led to a significant change that mobile service provider's dominance is considerably dispersed to the handset manufacturer and distributor. Under USIM-unlock environment, mobile service provider, handset manufacturer, and distributor have to make their decisions on their handset distribution channel strategies: the closed distribution channel strategy or the open distribution channel strategy. The change of distribution channel strategy between members in distribution channel can be understood as a matter of strategy choice, and we have developed a theoretical model and analyzed how to make a decision for the member's optimal distribution strategy based on 3-person game model between members of mobile phone distribution channel, under both of '1 subscriber-1 handset' and '1 subscriber-multiple handset' assumptions. Under '1 subscriber-1 handset' assumption, the closed strategy controlled by mobile service provider is all players' optimal solution because the maximum size of the mobile phone market is limited by subscribers. But, as total expected profit by the handset and distribution subsides is a deficit, mobile service provider have to choose the open strategy and consider the conversion to MNO(mobile network operator). Under '1 subscriber-multiple handset' assumption, mobile service provider is trying to find the way how to lock-in its service and mobile phone and how to maximize ARPU(average revenue per unit), while handset manufacturer and distributor have to look for the way how to maximize the mobile phone market using their own marketing efforts, because it is expected that total mobile handset demand for the open market is bigger than demand for the closed market under '1 subscriber-multiple handset' assumption.

• Structural Engineering and Mechanics
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• v.74 no.6
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• pp.821-832
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• 2020

The fundamental period is an important parameter for seismic design and seismic risk assessment of building structures. In this paper, a simplified theoretical method to predict the fundamental period of masonry infilled reinforced concrete (RC) frame is developed based on the basic theory of engineering mechanics. The different configurations of the RC frame as well as masonry walls were taken into account in the developed method. The fundamental period of the infilled structure is calculated according to the integration of the lateral stiffness of the RC frame and masonry walls along the height. A correction coefficient is considered to control the error for the period estimation, and it is determined according to the multiple linear regression analysis. The corrected formula is verified by shaking table tests on two masonry infilled RC frame models, and the errors between the estimated and test period are 2.3% and 23.2%. Finally, a probability-based method is proposed for the corrected formula, and it allows the structural engineers to select an appropriate fundamental period with a certain safety redundancy. The proposed method can be quickly and flexibly used for prediction, and it can be hand-calculated and easily understood. Thus it would be a good choice in determining the fundamental period of RC frames infilled with masonry wall structures in engineering practice instead of the existing methods.

• Journal of the Korean Society for Railway
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• v.15 no.1
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• pp.88-95
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• 2012

Presently, because making process of train service plan consist of various constraint condition, for example structure of track, structure of track in station, train maintenance time and others for considering to be necessary of train management, it has been had extremely complex structure problems. For these reasons, it has big problems to compare analysis for various train service time-table. A study suggest methodology to choice service the most effective schedule and plan of train put before comparative analysis on making train diamond picture's expected effect of established possible various train time-table in making process of train service schedule for improving effectiveness and organization of train service schedule establishment. A study uses Line-Blocking theory for analyzing train service time-table and analyze example for regional train Sadang to Ansan section in 4line.

• KIEAE Journal
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• v.17 no.4
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• pp.13-19
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• 2017

Purpose: The most important thing is to know exactly what needs users have when planning a housing. People have their own criteria that directly influence purchasing decisions when choosing a house to live in. And they select the house with the largest number of elements satisfying these criteria. This days most consumers are mostly satisfied with their material needs. And now people thinking more important motive than simply pursuing material gains. It is the most essential role in they consume consciously or unconsciously that meeting the needs of which step. And now days housing space has become a merchandise, this study check the related function of the residential space and human needs. Method: First, this study wanted to understand the housing needs, which is needs related to housing in basic needs that humans have. Second, this study wanted to understand what the requirements and the criteria for choosing housing of actual resident, who want to have changed housing. Third, This study check how to set up the direction of development in housing planning, through the comparison of the housing needs and the residential function defined above. Result: Henceforth housing should consider meet the Esteem Needs and Self-Actualization Needs, among the type of Grow-based Motivation. The functions for this are convenience, independence, economics, sociality, relaxation, and expressivity. In addition, it should be able to express oneself and recognize the value of oneself through leisure activities and interaction with neighbors. And, it should be able to move toward the direction to express that hobby activities for individual talent development in separate space.

• Journal of Technologic Dentistry
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• v.20 no.1
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• pp.121-138
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• 1998

With 1002 students around 8 colleges nationwide joining, the survey was on their knowledge before entering their school, and thereafer, the degree of their satisfaction in their major and professors & lectures. 1. When they chose their major, the most influential was their parents and relatives, the largest number of 435(43.5%) replied, About the motivation for selection their jajor, 454(45.4%) answered the most it seemed to be a bright future specialty. On that question, more freshmen(51.0%) answered theyu expected good trend than sophomores and juniors and more women students(48.8%) did so than men ones.(P<.05) 2. While 619(61.8%) were familiar with major before applying, only 68(6.85%) knew their major very well at that time. More freshmen(62.5%) applied in the state of well-knowing what their major is than sophomores and juniors did.(P<.01) More women students(40.9%) applied not knowing it than the counterpart. About the time for choice, 795(79.5%) answered the most one of application days. More women students(81.0%) chose their major during the application time(P<.01) 3. The satisfaction survey shows 438(43.8%) are satisfied and 165(16.5%) are not. More men students(47.2%) are satisfied.(P<.01) The factor their satisfaction is their major come together with aptitude(44.7%), 196ppl), and the dissatisfaction factor is the difficulty of the theory and practice.(30.8%, 171ppl) 4. If they could change their major, 454(46.6%) wouldn't do so, while 541(54.4%) would shift their major to other fields. More freshmen(49.5%) wouldn't change than sophomores and juniors. Neither did more men students(4938%) than women. Within the same grade, there's no meaninful difference.(P<.01) 5. On the satisfaction in the lectures of the professors of their major, 464(46.5%) said the lecutres are excellent, 102(10.2%), they are not. About the lectures of the liberal subjects, 193(19.4%) said are excellent, 365(36.6%) are not.

• Journal of the Korean Institute of Intelligent Systems
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• v.5 no.4
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• pp.41-55
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• 1995

In this paper, an optimal idenfication method using fuzzy-neural networks is proposed for modeling of nonlinear complex systems. The proposed fuzzy-neural modeling implements system structure and parameter identification using the intelligent schemes together wlth optimization theory, linguistic fuzzy implication rules, and neural networks(NNs) from input and output data of processes. Inference type for this fuzzy-neural modeling is presented as simplified inference. To obtain optimal model, the learning rates and momentum coefficients of fuzzy-neural networks(FNNs) are tuned automatically using improved modified complex method and modified learning algorithm. For the purpose of its application to nonlinear processes, data for route choice of traffic problems and those for activateti sluge process of sewage treatment system are used for the purpose of evaluating the performance of the proposed fuzzy-neural network modeling. The results show that the proposed method can produce the intelligence model with higher accuracy than other works achieved previously.

• The Journal of the Korea Contents Association
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• v.10 no.2
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• pp.306-319
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• 2010

Recently, crime prevention is away of important criminal justice policy and police activity also pursuit different change compare to the present times. After modern times, as get to know crime control change, eventually on the basis of experience that crime prevention is best way of crime control, what come out with new sight angle for the role of police is community policing. And emphasis points in police activity are variety of police activity, positive entry of community. In relation to this, we are learning crime prevention of the U.S.A and the program of community policing through crime prevention theory books that published in domestic. Then, there are misunderstanding possibilities that the programs which introduced relation books are doing someways all around the U.S.A In this research two cities san mateo county. california, of the U.S.A made a choice, and is going to search main crime present condition of these cities and really done community policing program or crime prevention program operation case.