• 제어로봇시스템학회:학술대회논문집
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• 1997.10a
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• pp.1856-1859
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• 1997

This paper describes the arousal measurement and the control system using fuzzy logic to prevent drowsy driving. Sugeno's method was used for fuzzy inference in this study. Membership function and rule base were determined form the modfied arousal level criteria. The output of fuzzy inference tracked well the change of subject's arousal level. When IRI(Inter-SIR interval) was under the 60sec, maximum output of three step warning method was medium sound, but that of fuzzy logic system was changed from medium to big. Furthermore, the output of the fuzzy inference was highly correlated with $N_{z}$(r=0.99). Therefore, the fuzzy inference method for evaluation and the control of arousal will be more effective at real driving sityation than three step warning method.ning method.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1994.04a
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• pp.57-64
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• 1994

The purpose of this paper is to find minimum surface shape of pneumatic structure using the finite element method. The pneumatic membrane structure is a kind of large deformation problem and very flexible composite material, which mean geomatric nonlinearity. It is not to resist for compression and resultant moment. As the displacement due to internal pressure is getting bigger, it should be considered the direction of forces. It becomes non-linear problem with the non-conservative force. The follower-force depends on the deformation and the direction of force is normal to each element. The solution process is obtained the new stiffness matrix (load correction matrix) depending on deformation through each iterated step. However, the stiffness matrix have not the symmetry and influence on the time of covergence. So in this paper Newton-Rhapson method for solving non-linear problem and for using symmetic matrix, the load direction is changed in each iterated step using the transformation matrix.

• Journal of Applied Tourism Food and Beverage Management and Research
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• v.7
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• pp.41-59
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• 1997

After the industrial revolution, we have changed whole life-styles. This trend has brought a change in our eating style. Nowadays, the great number of people go out to eat-even three meals a day. As a result, the growth rate of food service industry increases day by day. Some restaurants are managed by the large scale company and others by the small scale ownership. Though developed countries are in the maturity step of the product life cycle in this field, we are in the growth step. We will hold the in 2002. A lot of tourists and the press will rush to Korea. They must have their meals at the restuarant. Therefore, we need more practice to satisfy them and to lead to successful management in this field. Also, we need an evaluation to qualify each business so that our food service industry does not decline compared to other country's. This study is trying to find how to evaluate and qualify each business in the various areas: service, the quality of food, the mood of the restaurant and so on. In addition, it includes the restaurant rating form.

• Journal of Korean Institute of Industrial Engineers
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• v.41 no.4
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• pp.368-380
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• 2015

This paper deals with a case study of layout design and improvement in medium and small-sized manufacturing factories. The shop layout affects greatly the productivity of manufacturing systems and we introduce some cases in which shop layouts are changed to improve the productivity step by step. Based on case studies, we propose also some guides to improve and design the shop layout in medium and small-sized manufacturing factories.

• Journal of Educational Research in Mathematics
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• v.12 no.1
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• pp.109-124
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• 2002

This study investigated various effects of WBD(web-based discussion) on mathematical communication, interaction and problem solving in the classroom. We developed a web site including BBS and chat room in order to encourage students' mathematical curiosities and self-studies. The web site had been operated for 6 months. Five classes of 1st grade students were selected from an middle school in Daejon. Moreover, we analyzed several cases for interactional behavior and effect. WBD promote dialogue between a teacher and students. Analysis of feed-back from BBS revealed that student's negative attitudes could be changed to positive ones by step-by-step discussions. Moreover, collaborative learning is enhanced by on-line discussion. But the effects of WBD are affected by the character and ability of a student.

• Proceedings of the IEEK Conference
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• 2002.06c
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• pp.5-8
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• 2002

In this paper, we propose the self-autonomous algorithm for mobile robot system. The proposed mobile robot system controlled by Personal Digital Assistant(PDA) can follow the target at regular intervals. The mobile robot can evaluate the distance between robot and target with ultrasonic sensors, transmits the distance to the PDA. The velocity and direction decided in PDA are transmitted to the mobile robot with wireless LAN communication. Considering the state, velocity-changing and distance-maintenance, of the mobile robot, driving velocity and direction are applied. For safety, the velocity of the mobile robot is changed step by step. As a result, we confirm the ability of following the target with proposed mobile robot.

• Korean Institute of Interior Design Journal
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• no.41
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• pp.190-197
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• 2003

This study is based on the Importance of home office in domestic environment in Korea. In recent years, the distribution of network environment at home has been changed rapidly Each family member uses home office for various purpose. The home office in domestic living environment become a part of common use for all family member. The purpose of this study is to set the framework of design direction in terms of system furniture for home office within the limitation of current standard space at home such as typical apartment - 30 pyeong, 40 pyeong. The first step of study is to understand user space and user needs through the user survey. The second step is to find the right location and plan of home office in domestic environment. The last is to suggest the integral system furniture and elements that fits to the various situations of location according to the space and user type.

• Corrosion Science and Technology
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• v.5 no.6
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• pp.206-212
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• 2006

The effects of sub-ppm levels of $H_2S$ and the adsorbed water on the atmospheric corrosion of silver were studied with In situ weight balance to study the effect of the adsorbed water on the kinetic behavior and to determine the rate-controlling step, with XPS to analyze the tarnish film, and with calculation of phase equilibrium to predict the stable solid phase, the concentrations of dissolved species ($Ag^-$, $H^+$, $S^{2-}$, $HS^-$) and the equilibrium potentials ($E_{Ag^+/Ag}$, $E_{H^+/H_2}$, $E_{O_2/O^{2-}$). The results of weight measurements showed that oxygen was required for the sulfidation of silver in 100 ppb $H_2S$ and humidified environments enhanced the tarnished rate and oxidizing power. In addition, the rate determining step for tarnishing silver was shown to be changed to transport though the tarnish film.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2001.05a
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• pp.149-152
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• 2001

Goals of this study are to analyze various types of facility disposition which is brought out in the facility space plan of the modernized elementary school which has been founded and conducted by Seoul city, and most of all, to grasp the space propriety through understanding the peculiarity of the plan by the space analysis form. To proceed this study, I will divide it to three steps; 1. First step : Research into the space alternation of an (Korean) elementary school which has been gotten changed by the alternation of an elementary school. 2. Second step : Research into the efficient studying-space of a modernized elementary school by contemplating analysis of cases which comes from the literature research, collecting related data, and making an on-the-spot survey

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.426-429
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• 1999

In this paper, we have provided the measurement technique of the grounding mesh resistance by field measurements. The standard of measurement is specified in the IEEE Std 81.2-1991 and JEAC 5001-1988, which is the the fall-of-potential method by test-current injection, but this method is difficult to apply at field, where is small around a electric power substation of domestic. For the convenient measurement method, space of assistant probe and quantity of test-current injection are changed step for step. As the result, ' the proposed measurement technique of grounding mesh resistance is that the space of current and potential probes must be fixed at 150rn from a grounding mesh, the test-current injection has to keep 5A or more.