• 대한예방의학회:학술대회논문집
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• 1994.02a
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• pp.450-468
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• 1994

Scientists have long used conventional toxicological methods to establish 'safe levels of exposure' for chemicals presumed to have threshold health effects or doses below which significant effects are unlikely to occur. These same methods cannot be used to establish safe levels of exposure for non-threshold pollutants. such as carcinogens. Therefore. Federal regulatory agencies in the United States are using risk assessment methods to provide information for public health policy decisions concerning increases in risk associated with increases in exposure to carcinogenic and other non-threshold pollutants. Acceptable exposure/risk levels are decided by policymakers who consider descriptions and estimates of risks together with social and economic benefits from the uses of the chemical. 1bis paper focuses on the development of quantitative risk assessment approaches by Federal regulatory agencies in the United States, and identifies the mathematical models currently being used for risk extrapolation. including their inherent uncertainties. The uncertainties and limitations of these methods have led some scientists to question the utility of quantitative risk extrapolation. The experience of the; U.S. Environmental Protection Agency (EPA). as summarized in this paper. can provide a realistic basis for evaluating the pros and cons. Finally. shortcomings in current risk assessment methods and their use in policy decisions are explored. and areas for possible improvement. given current scientific knowledge. are identified.

• The Journal of the Korea Contents Association
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• v.14 no.11
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• pp.50-59
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• 2014

A basic role of sound is to give realism to the expressions on the screen or to highlight the images using exaggerated effect as a supporting role. In that way, sound effect makes it possible for audiences to naturally understand realistic images. However, the sound effect in movies is not real 'sound' in fact. Rather, sound effect is a separate cinematic tool that needs a separate direction to manipulate sounds in order to create appropriate effects for particular intention in the movie. While watching the movie, the audiences go through unique experience where they comprehend the manipulated world as the real world. Therefore, direction for sound effect must help deliver realism to the images by auditory factors. Thus, effective sound direction shall have precise and independent design for identification, reason and eurythmical match with the screen and occurred sounds shall be designed based on the subjective listening point to see who is actually listening.

• Korean Journal of Computational Design and Engineering
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• v.17 no.5
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• pp.333-341
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• 2012

Modeling and simulation is important for military training. People can feel perspective when stereoscope images are created using multi-channel visualizations. A submarine oscillates when the submarine is just below the surface of the sea, so that the reconnaissance becomes difficult. Also, the operator should read the information of the target within 6 seconds using the periscope. The operator must have experience. To solve these problems, stereoscopic multi-channel visualization has been tested. The iCAVE system of KAIST provides a large-scale screen, 7 PCs, and 14 projectors to create the stereoscope images. To simulate the motion of a submarine just below the ocean surface, a 4-DOF motion platform is used. The motion data is transmitted to the visual system and the motion platform through the UDP protocol. Variety of weather conditions are created using the Vega Prime software. The stereoscopic multi-channel visualization and the motion platform system created a realistic simulation system.

• International Journal of Human Ecology
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• v.5 no.2
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• pp.111-122
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• 2004

This paper outlines the findings of a consumer survey conducted in 1996 and 2001 by the University of Bonn, Germany, across 15 European countries. The survey involved a sample of 3,300 respondents in 1996 and around 11,000 respondents in 2001, throughout all 15 EU countries. Children and adolescents, between the ages of 10 and 17, were surveyed about their consumption habits and their attitudes towards the environment. The paper outlines the key findings on 'Children's fears and future prospects'. Children are exposed to a great mass of information, not only derived from the media but also from what they experience directly in their everyday-life. Some of this information translates into worries that adopt a clearer (more realistic) form when children become adolescents, as they might be easily involved in those events, and the understanding of the processes that may cause or continue them is deeper. Today's children and adolescents are under more pressure, since the social/political/economical spectrum is constantly changing. Change produces anxiety, fear of what will result from these transformations, as it implies that the social order will be reorganized. This paper reports on a long term comparative study among children and adolescents throughout the European Union, analyzed by country, age group and gender. It draws different preoccupations of young generations and consequent future expectations. It concludes by considering the influence of social and political organizations, as well as the family, on children and adolescents, as these might help to sustain a positive attitude towards various future events.

• The Journal of Korean Physical Therapy
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• v.32 no.1
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• pp.7-13
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• 2020

Purpose: This study examined the level of self-esteem and awareness of sexual harassment among college students majoring in physical therapy to discover the status of sexual harassment and the types of and responses to sexual harassment at clinical training sites. Methods: The study participants included 195 college students majoring in physical therapy in Gyeonggi and Chungcheong provinces, who responded fully to the survey questionnaire. The data were prepared through self-reporting on a structured questionnaire and collected from September to November 2018. Results: The difference in the mean value of self-esteem was evident between the two groups investigated. The most common types of sexual harassment were verbal, visual, and physical. The types of damage reported by the participants were emotional, physical, and social. The group of participants who experienced sexual harassment had a high rate of avoidance, while the group of participants who did not experience sexual harassment exhibited a high rate of coping. Conclusion: The incidence of verbal sexual harassment was reported to be significantly higher, and the emotional damage was the most serious. Students should be provided with more specific and realistic preventive education or countermeasures so they can respond more proactively to real situations.

• Journal of the Korea Society of Computer and Information
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• v.16 no.4
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• pp.197-204
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• 2011

In this research, we have developed a virtual interview simulation system that utilizes the 3D stereoscopic technology. For this virtual simulation can play individual question stereoscopic movies using seamless loop technology, it provides realistic environment and interviewee with 3D filmed interviewer increasing reliable experience for interviewees. Implementing question-pool system and real-time construction of questionnaires is also available so that the interviewee can train and prepare for the various situations. This will reduce the effort for work power, time, place and cost, opening for a possibility of utilizing for many other areas such as linguistics study and public sector.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.3
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• pp.1026-1042
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• 2020

People are increasingly demanding to experience realistic behavior of virtual characters in computer games. In this article, we build a computer model for simulating a bicycle rider's behavior in a virtual riding system. A method to calculate the speed of a bicycle rider is proposed to improve the reality in a virtual riding system. In this method, the property of physical energy is introduced, and the bicycle-riding speed is calculated in real time according to the relationship between the rider's physical energy and bicycle-riding speed. Then based on the analysis of the behavior of a cyclist in a real competition, various behaviors of the virtual rider are designed and a behavior-tree for the virtual bicycle rider is constructed accordingly. On the basis of these, a virtual riding system is developed. The experiments results show that our system can simulate the behavior of a virtual bicycle rider, and thus encourage exercise on a stationary bicycle.

• Journal of Institute of Control, Robotics and Systems
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• v.4 no.6
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• pp.802-810
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• 1998

The purpose of this study is to find the analytic solution of determining the optimal capacity of processes and storages to meet the product demand. Recent trend to reduce product delivery time and to provide high quality product to customer requires the increasing capacity of storage facilities. However, the cost of constructing and operating storage facilities is becoming substantial because of increasing land value, environmental and safety concern. Therefore, reasonable decision making about the capacity of processes and storages is important subject for industries. The industrial solution for this subject is to use the classical economic lot sizing method, EOQ(Economic Order Quantity) model, trimmed with practical experience but the unrealistic assumption of EOQ model is not suitable for the chemical plant design with highly interlinked processes and storages. This study, a first systematic attempt for this subject, clearly overcomes the limitation of classical lot sizing method. The superstructure of the plant consists of the network of serially and/or parallelly interlinked processes and storages. A novel production and inventory analysis method, PSW(Periodic Square Wave) model, is applied. The objective function of optimization is minimizing the total cost composed of setup and inventory holding cost. The advantage of PSW model comes from the fact that the model provide a set of simple analytic solution in spite of realistic description of material flow between process and storage. The resulting simple analytic solution can greatly enhance the proper and quick investment decision for the preliminary plant design confronting diverse economic situation.

• Journal of Institute of Control, Robotics and Systems
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• v.19 no.6
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• pp.563-568
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• 2013

The purpose of this study is to find the analytic solution for determining the optimal capacity (lot-size) of a batch-storage network to meet the finished product demand under infrequent shutdowns. Batch processes are bound to experience random but infrequent operating time losses. Two common remedies for these failures are duplicating another process or increasing the process and storage capacity, both of which are very costly in modern manufacturing systems. An optimization model minimizing the total cost composed of setup and inventory holding costs as well as the capital costs of constructing processes and storage units is pursued with the framework of a batch-storage network of which flows are susceptible to infrequent shutdowns. The superstructure of the plant consists of a network of serially and/or parallel interlinked batch processes and storage units. The processes transform a set of feedstock materials into another set of products with constant conversion factors.A novel production and inventory analysis method, the PSW (Periodic Square Wave) model, is applied. The advantage of the PSW model stems from the fact it provides a set of simple analytic solutions in spite of a realistic description of the material flow between processes and storage units. The resulting simple analytic solution can greatly enhance a proper and quick investment decision at the early plant design stagewhen confronted with diverse economic situations.

• International Journal of Contents
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• v.6 no.3
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• pp.38-46
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• 2010

In this study, five personality types of employees have any impact on their creativity, a systematic and comprehensive study of literary research and demonstration studies were parallel. Results of the research employee of the extroversion, agreeableness of their creativity (+) showed the impact. In addition, sincerity, openness to experience, personality and creativity of employee creativity (+) for influencing said. Neuroticism to creativity, but nature does not affect any found. This study, five personality types that affect employee creativity of individuals by examining the relationship between personality type and creativity by presenting a model for the study, employees' personality types can have on creativity and offers a realistic alternative to the theory presented you can find the meaning in that. These theoretical and empirical validation of the results of employee productivity oriented organizations, including human resource management in a systematic and reasonable for the type of personality tests are being conducted on the administrative feasibility is expected to be able to provide. Finally, based on the results of these studies, management and administrative implications and future research directions presented.