• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.48-52
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• 2007

A lot of researches have been done in order to investigate the dynamic characteristics of the aerostatic porous bearing, most of them used analytical approaches and only a few used experimental approaches. However the experimental condition used in the previous experimental approaches was not realistic, where the porous bearing has been fixed and only the mass supported by the bearing was allowed to move vertically. The dynamic stiffness obtained by those experimental setups may be different with the real case where the mass and the bearing move together in horizontal direction. In this paper, the dynamic characteristics of the horizontally moving aerostatic circular porous air bearings are investigated by the experimental approach. The experimental apparatus was designed to realize its real operating condition used in most industrial applications. The experimental results were compared with the previous experimental ones.

• Journal of Periodontal and Implant Science
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• v.41 no.1
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• pp.44-50
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• 2011

Purpose: Pathologic tooth migration (PTM) is a tooth displacement which is derived from imbalance of tooth retention force and is dominantly found out in maxillary anterior area. PTM in maxillary anterior area was tried to corrected with periodontal treatment and a clear aligner in this study and the result was evaluated clinically and radiographically. Methods: For the treatment of a patient with chronic periodontal disease accompanied by maxillary anterior pathologic tooth migration, clear aligner was applied to move teeth after a series of case-related periodontal therapy. Clinically, probing depth, gingival recession, clinical attachment level and mobility were measured pre- and post-treatment, and radiographic examination was performed as well. Results: Clinically, we found the decrease of the probing depth, gingival recession, clinical attachment level and mobility. And we could also acknowledge the reduction of vertical and horizontal dimension on infrabony defect radiographically. However, it is still controversial if there was an actual bone filling. Conclusions: Clear aligner is an effective appliance to move teeth since it costs little in terms of expense and time. In addition, it wraps whole crowns, providing advantages to deal with crowding, spacing, and size of arch. In short, clear aligner could be a useful treatment option for PTM patient, since it provides decreased probing depth, gingival recession, clinical attachment level, mobility and esthetical restoration.

• Journal of Korea Multimedia Society
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• v.6 no.7
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• pp.1231-1238
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• 2003

As the demand on multicast services increases to support the terminal mobility in the midst of the development of wireless mobile communication technology, many new methods have been studied. However, previous methods occur delay and packet loss during re-joining to multicast service group when moving mobile node. In this paper, we will propose a scheme that decreases packet loss using regional registration method. Proposed scheme modified signaling message of previous regional-registration and added caching. In case move to same GFA, we can prevent packet loss by keeping registration to FA until perfectly registration ends. Also, In case move to other GFA, we can reduce packet loss by using cache. Therefore, we can receive efficient multicast service.

• Journal of the Korean housing association
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• v.8 no.2
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• pp.37-47
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• 1997

The purpose of this study was to analyze the housing life-style shown in the modern housing life by dweling types and residents attributes to suggest the basic information useful for the housing P3an in the future, The results of this study was summarized as folldws. Firstly. interrelation between residents attributes and housing life-style showed that the unedicated, the low income and the eldery were interested in utility. On the other hand, the educated. the upper income and the young generation were interested in decoration. Secondly those who had their own houses and never moved were interested inutility in terms of residents attributes Utility was showed high in all housing style in terms of before moving in house. Thirdly, those who wanted move and stay both interested in decoration and utility in terms of will of resident. It was also shown that those who wanted to move big cities were interested in increasing property. Fourthly, the housing life-style by dwelling types showed that it was Possible to abtain six elements such as 'decoration', 'display'. 'liking'. 'utility', 'increase of property', and 'hiearchic order' Based on the average by each type, it was shown that while a tendency toward utility was generally high, especially, the many-storied apartment was high for display.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.6
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• pp.1318-1324
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• 2012

This paper proposes a novel method for Game character classification based on texture and edge orientation feature. The character dose not move(NPC) and move the character is classified. Classification of property within the character of straight line segments are used to extract features. First, the character inside edge feature extraction and then calculates EEDH, SSPD. The extracted attribute represents the energy of a particular direction. Thus, these properties were used to classify of NPC and Monster. The proposed method, the user can reduce the unnecessary time in the game.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1167-1172
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• 2007

Generally inpipe robot needs force above standing for contacting robot to pipe. If the environment of the pipe-inside does not change, there is not a problem. But if the pipe radius change, or occur the obstacle which it does not intend, problem gets. So it uses a different system and must know an environment change, and changing the shape or a form of the robot. The research uses the flexible leg and is the robot which is adapted to the environment change of the pipe. The advantage of this robot is possible to move when it does not need to recognize a change of environment of pipe. Leg is bend with one direction. When it moves part that there are legs effect of leg direction the robot is moved with only one direction. If friction between legs and pipe is sufficient, not only verticality pipe moving, but also curved pipe moving. Also the obstacle of the pipe inside occurs and the diameter of the pipe inside changes, this robot can move if it does not use another system or device.

• Korean System Dynamics Review
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• v.7 no.2
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• pp.191-213
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• 2006

Increasing of the number of Roe Deer in Jesudo is regarded as an direct cause of the damages of Roe Deer - i.e. damages of crops and trees by Roe Deer and traffic accidents between human and Roe Deer. But, no study of the number of Roe Deer in Jejudo has been found and never has been progressed it and nobody convinces about the total number of Roe Deer in Jejudo. In this paper, we focus at the moving pressure which enforces Roe Deer to move the other places. Moving pressure is appeared when the habitat environment destruction of Roe Deer and it forces Roe Deer in hilly section to move the middle mountains section and the low section. This moving pressure promotes the moving of Roe Deer to the other places and then the total number of Roe Deer in new places are increasing. High density of Roe Deer makes the habitat environment bad and increases the competition of Roe Deer. These patterns are repeated continuously. The habitat environment of Roe Deer is related with human life area very closely. We should keep and preserve our nature and environment, and if we develop our nature then we must consider our ecosystem in all aspects. It's the most important thing to us and Roe Deer and other living things.

• The Journal of Korea Robotics Society
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• v.8 no.4
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• pp.247-255
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• 2013

This paper shows the development of a snake robot (KAEROT-snake V) which consists of 16 1-DOF actuator modules and head module. The modules are connected serially and the joint axis of each module is rotated by $90^{\circ}$ with respect to the previous joint so that the snake robot can move in the 3D space. A tail actuator module includes slip-ring and metal connector. KAEROT-snake IV developed in prior research could move in the 3D space and climb up in a narrow pipe. But its design was not appropriate to the unstructured tough environment and its speed was somewhat slow. A new actuator module is designed to enclose all parts of the module so that any wire is not exposed. The size and weight of the new module was slightly reduced. And the rotation speed and torque of the joint was increased by about twice when compared with pre-module. An embedded controller was developed so small that it can be mounted inside the module. The performance of the developed robot was demonstrated through various locomotion experiments.

• Journal of Korea Multimedia Society
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• v.19 no.1
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• pp.60-67
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• 2016

PC users have long been controlling their computers using input devices such as mouse and keyboard. To improve inconveniences of these devices, the method of screen-touching has widely been used these days, and devices recognizing human gestures are being developed one after another. Fox example, Kinect, developed and distributed by Microsoft, is a non-contact input device that recognizes human gestures through motion-recognizing sensors, thus replacing the mouse as an input device. However, when controlling the mouse on a large screen, it suffers from the problem of requiring large motions in order to move the mouse pointer to the edges of the screen. In this paper, we propose a joystick-driven mouse-controlling method which enables the user to move the mouse pointer to the corners of the screen with small motions. The experimental results show that movements of the user's palm within the range of 30 cm ensure movements of the mouse pointer to the edges of the screen.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.358-359
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• 2018

In this paper, opencv and android studio are used to distinguish between objects ahead of the blind. When the movement is detected in a positive direction in connection with the camera of the smartphone, the user is informed that the part of the camera is being rabelified and continues to track using the mean shift algorithm. A C ++ program based on OpenCV-based was used for real-time motion observation and the application will be produced by android studio. As a result of the study, objects that move with Labeling are identified and the box area is specified using the mean shift algorithm to move the box along with the object to track objects in real time.