• Transactions of Materials Processing
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• v.17 no.2
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• pp.124-129
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• 2008

Net shape forging technologies give many effects into the costs and qualities for the finished products. So, the studies to reduce the additional machining amount are very important in forging industry. Specially, there are two main topics in cold forging industry, such as, tool life and precision forging. In this study, new forging technique was proposed to eliminate the machining process for fixing up the length and improve the lead accuracy of gear. The luck-up hub is manufactured through many processes, such as upsetting, piercing and direct extrusion. The gear is formed in direct extrusion process; however, lead accuracy of the gear is over allowance limit. Therefore, the additional sizing process must be added. In this study, process design for closed-die forging of a lock-up hub used for a component of automobile transmission was made using three-dimensional finite element simulations, and the strain distributions and velocity distributions are investigated through the post processor. The rigid-plastic finite-element method for back pressure forging has been used in order to reduce development time and die cost. Using the FEM simulation, we found the optimum value of back pressure. The prototypes of lock-up hub parts were forged into the net-shape. In the experiment, lead precision of tooth are measured by the CCMM(Contact Coordinate Measuring Machine). The dimensional accuracy of forged part was improved up to the 40% when back press was applied.

• Biomolecules & Therapeutics
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• v.20 no.1
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• pp.125-131
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• 2012

Impulsiveness is an important component of many psychiatric disorders including Attention-deficit/hyperactivity disorder (ADHD). Although the neurobiological basis of ADHD is unresolved, behavioral tests in animal models have become indispensable tools for improving our understanding of this disorder. In the punishment/extinction paradigm, impulsivity is shown by subjects that persevere with responding despite punishment or unrewarded responses. Exploiting this principle, we developed a new behavioral test that would evaluate impulsivity in the most validated animal model of ADHD of the Spontaneously Hypertensive rat (SHR) as compared with the normotensive "control" strain, the Wistar Kyoto rat (WKY). In this paradigm we call the Electro-Foot Shock aversive water Drinking test (EFSDT), water-deprived rats should pass over an electrified quadrant of the EFSDT apparatus to drink water. We reasoned that impulsive animals show increased frequency to drink water even with the presentation of an aversive consequence (electro-shock). Through this assay, we showed that the SHR was more impulsive than the WKY as it demonstrated more "drinking attempts" and drinking frequency. Methylphenidate, the most widely used ADHD medication, significantly reduced drinking frequency of both SHR and WKY in the EFSDT. Thus, the present assay may be considered as another behavioral tool to measure impulsivity in animal disease models, especially in the context of ADHD.

• Computers and Concrete
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• v.25 no.1
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• pp.67-73
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• 2020

Traditionally used analytical approach to predict the fatigue failure of reinforced concrete (RC) structure is generally conservative and has certain limitations. The nonlinear finite element method (FEM) offers less expensive solution for fatigue analysis with sufficient accuracy. However, the conventional implicit dynamic analysis is very expensive for high level computation. Whereas, an explicit dynamic analysis approach offers a computationally operative modelling to predict true responses of a structural element under periodic loading and might be perfectly matched to accomplish long life fatigue computations. Hence, this study simulates the fatigue behaviour of RC beams with finite element (FE) assemblage presenting a simplified explicit dynamic numerical solution to show computer aided fatigue behaviour of RC beam. A commercial FEM package, ABAQUS has been chosen for this complex modelling. The concrete has been modelled as a 8-node solid element providing competent compression hardening and tension stiffening. The steel reinforcements are simulated as two-node truss elements comprising elasto-plastic stress-strain behaviour. All the possible nonlinearities are duly incorporated. Time domain analysis has been adopted through an automatic Newmark-β time incremental technique. The program consists of twelve RC beams to visualize the real behaviour during fatigue process and to obtain the reliability of the study. Both the numerical and experimental results indicate a redistribution of stresses along the time and damage accumulation of beam which severely affect the serviceability and ultimate capacity of RC beam. The output of the FEM analysis demonstrates good match with the experimental consequences which affirm the efficacy of the computer aided model. The controlled fatigue damage evolution at service fatigue load limits makes the FE model an efficient tool in predicting high cycle fatigue behaviour of RC structures.

• Archives of design research
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• v.20 no.2 s.70
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• pp.89-102
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• 2007

Seoul suffers from over congestion of outdoor signage. Signage is on everywhere including on windows, on entrance way, on every available space on the building wall. The excessiveness is up to the point that decorating surface of a building is almost meaningless and most signage is lost in each other's profuse presence. The competition to attract more attention is resulting in bigger, brighter, and more stimulating signage. As the result, outdoor signage of Seoul have lost its intended function to provide useful information and befallen to be viewed as visual pollution. As it is an important visual element of city view, the outdoor signage also serves important role of delivering needed information in proper way to enhance convenience of city life. At the same time, it is a very important marketing tool that is essential to economic activity. Outdoor signage also holds enormous potential to act as a visual and structural element to improve city view just as a beautiful architecture does. However, outdoor signage that does not consider the harmony with its surrounding environment can only be treated as visual pollution. The effort of Seoul to better the city view by improving the outdoor signage started at Jong-ro area. By reforming outdoor signage, the streets of Jong-ro achieved much more harmonious and aesthetically pleasing city view. The study went through analysis of current status and characteristics of outdoor signage of Cheonho-dong Rodeo Street, Gangdong district to suggest detailed design solution to reform the roadside view and to revitalize the street.

• Journal of Internet Computing and Services
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• v.7 no.1
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• pp.91-99
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• 2006

This paper proposes a control path analysis mechanism to be used in the workflow mining framework maximizing the workflow traceability and re discoverability by analyzing the total sequences of the control path perspective of a workflow model and by rediscovering their runtime enactment history from the workflow log information. The mechanism has two components One is to generate the total sequences of the control paths from a workflow mode by transforming it to a control path decision tree, and the other is to rediscover the runtime enactment history of each control path out of the total sequences from the corresponding workflow's execution logs. Eventually, these rediscovered knowledge and execution history of a workflow model make up a control path oriented intelligence of the workflow model. which ought to be an essential ingredient for maintaining and reengineering the qualify of the workflow model. Based upon the workflow intelligence, it is possible for the workflow model to be gradually refined and finally maximize its qualify by repeatedly redesigning and reengineering during its whole life long time period.

• The Korean Journal of Food And Nutrition
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• v.28 no.6
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• pp.1056-1064
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• 2015

This study was designed to provide the basic data of an effective nutrition education for desirable lifestyle and dietary habits to improve the nutritional status for the elderly by investigating health-related lifestyle, dietary habits, nutritional knowledge, and food intake of the elderly. The subjects included 58 elderly men and 146 elderly women. 35.8% had no more than an elementary school education. Most subjects (54.4%) were widows/widowers. Most subjects (71.0%) made over 150,000 won. 52.5% of subjects lived in houses. Smoking, drinking, exercise, the average sleeping time were significantly difference between the gender (p<0.05). In terms of dietary habits, our results showed that 80.9% of respondent eat regularly meals, including breakfast (83.5%). Both sexes prefer soft and salty food. Women enjoys more spicy and salty food compared with men and then shows meaningful difference (p<0.05). Their favorite meals are soup, stew, salad and boiled vegetables. Compared to women, men have a higher rate of correct answers about questions related to nutrition knowledge as showing significantly difference (p<0.05). In a study of dietary habits, they take in carbohydrates with the highest percentage and following by vegetables and fruits. The amount of meat, first and egg they eat is more than the previously. Eating meat is higher men as showing significant difference (p<0.05). In summary, nutritional status for the elderly shows healthy lifestyle and diet about half of those and most them try to live healthy life in future. It is hope that the elderly may need to learn proper nutrition knowledge for healthy lifestyle and nutrition education and counseling for building up healthy lifestyle and desirable dietary habits. Furthermore, it is necessary to start work to establish a baseline nutritious evaluation for the elderly and at a time to study the development of standard eating tool proven reliability and validity, consequently to provide a basic framework for the evaluation of nutritional status.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.3
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• pp.233-240
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• 2000

A small rivers take advantage of not only a site of superb scenic beauty, a play space, a rest place but also a momentous waters reservoir, a drainage on territory residents. Likewise, part of the most massed a life space to a region dwellers shall be extremely in harmony with coexistence space in that every kind plant, animal over again a human being and so on. For improvement planning of small river, various way and model are presented. But, it's want of ability for small rivers of a adaption many-side and throwing in a lot of financial resources. Because the improvement planning of small river was designed all small river in a county, the priority must be preprocessed. Now, the counties prioritized for improvement planning of small river are a few, and acquisition and manipulation of the data are time-consuming. Geo-Spatial Information System (GSIS) is specifically designed to manage and analyze spatial data. It will be to offer the benefit to the determination of the improvement priority in a small river. The purpose of this study is to offer priority for improvement planning of small river using GSIS. For this purpose, it was developed using Arc/Info software and AML was used as a developing tool.

• Journal of Families and Better Life
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• v.31 no.6
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• pp.97-112
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• 2013

This study was conducted to investigate the effect of sandplay therapy for couples on the self-differentiation, and heterosexual relationship satisfaction, of couples who are college students'. The subjects were four couples who are college students living in Seoul with low self-differentiation and heterosexual relationship satisfaction. I carried out sandplay therapy on four couples for once a week for 10 weeks, and each session was 70 minutes long. In this study, the self-differentiation scale was modified for Korea on the basis of Bowen's family systems theory (1976), and it was used as a research tool. Yu (2000) and Lee (2000) made a scale to measure heterosexual relationship satisfaction after they adjusted the Korea Marital Satisfaction Inventory (K-MSI). The scale was also used in order to compare pre-therapy and post-therapy traits and identify any changes. In addition, the group's behavior and interactions were observed and recorded in each session throughout the process of sandplay therapy with the couples, and the behanior and interactions were analyzed along with the change flow in the sand trays. The study's outcomes are summed up as follows. First, sandplay therapy with couples advances the level of self-differentiation in college students. Second, sandplay therapy with couples improves the heterosexual relationship satisfaction on college students. Third, the trays used in sandplay therapy with couples showed positive changes as the therapy progressed. As the sessions continued, negative factors in the trays decreased and the trays converged into one. As the sessions proceeded, it was observed that the couples became closer, felt more comfortable with each other, compromised and reflected on their relationship. The study's results show that sandplay therapy with couples increased the level of self-differentiation in college students and heterosexual relationship satisfaction, thus proving the therapy's effectiveness.

• Korean Journal of Construction Engineering and Management
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• v.10 no.2
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• pp.26-33
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• 2009

The required level of detail in scheduling depends on the stages in the construction life-cycle. The objective of this study is to provide a Standardized Schedule Model (SSM) with an aim to facilitate the estimating of construction duration in the planning stage. The SSM modularizes work items; establishes relations between preceding and succeeding activities; and calculates approximate construction duration. The estimated duration of the SSM was compared with the detailed duration from the commercial scheduling tool using actual work activities. The difference showed to be ranged between -3.1% and +15%, which demonstrates that the SSM can be feasibly applied to the approximate estimation of construction duration.

• 기술발표회
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• s.2006
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• pp.279-291
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• 2006

This study shows decision-making process for selection of cutoff wall on a wastewater treatment project. There are 10 different cut-off wall methods So, we examine the site to gather information for find appropriate methods. After using that information, 10 cutoff wall methods are reviewed for analysis. Through brainstorming, four alternatives are selected for design VE item. Following the standard VE process, we established performance criteria and evaluated function score(F) using questionnaire. The questionnaires, brainstorming and AHP method for weighting on performance criteria and evaluate function score increased the reliability of this selection process. Water Jet method, one of four methods, has the best function score(F=92.71) and the lease construction cost(as cost index 1,000). The value score also highest as 92.7, so we select the method. The result is value innovation type In addition, the authors try to calculate the environmental burden in selection process using LCA. We cannot conduct the full LCA as defined ISO, so perform Simple LCA In LCA result, the cut-off grouting has the least environmental burden as index 9.09E+01 and Water Jet method has following as the second. To selection best method to specific area and purpose, design VE/LCG process used as useful tool and it is needed to develop integrated method that evaluate VEILCC and LCA as one-set process.