• Journal of Institute of Control, Robotics and Systems
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• v.5 no.4
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• pp.454-461
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• 1999

A concrete floor trowel machine, developed in the U.S in 1990's, consists of only two rotary trowels, and doesn't need any other mechanism for motion such as wheels. When the machine flattens a concrete floor with its rotary trowels, the machine can move in any direction by utilizing the unbalanced friction forces occurring between the rotary wheels and the floor when the trowels are tilted in appropriate directions. In order to automate the trowels machine, this paper proposed the self-propulsive concrete finishing trowel robot which has twin trowels. For the control of the robot, this paper discussed the following. Firstly, the dynamics model of the driving frictional force applied on each trowel from the floor is derived. Secondly, the relationship between the driving force for the robot and the control variable of the robot is derived. Finally, the basic motion of the robot are realized by using the obtained relationship. This paper figures out how the concrete floor finishing robot with tow trowels moves and will contribute to realizing it.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.525-535
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• 2016

The purpose of this study was to evaluate the effect of thoracic dynamic stretching with elastic band on the ROM and ball speed for baseball player. For this purpose, 11 baseball players of the I city high school and university performed thoracic dynamic stretching with elastic band before throwing a ball. After stretching, we measured the ROM and ball speed and compared. The results were as follows. First, ROM after stretching showed a significant increase immediately compared with before stretching. Second, the speed of the ball was significantly increased after stretching compared with before. These results indicated that thoracic dynamic stretching with elastic band for baseball players might have a positive effect on ball speed as well as ROM.

• Journal of Korean Orthopaedic Sports Medicine
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• v.1 no.1
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• pp.102-107
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• 2002

Purpose: The aim of this retrospective study were to report the short-term results of inferior capsular shift procedure using splitting subscapularis and capsule for the patients who had shoulder instability and were apt to recur after arthroscopic stabilization procedure. Materials & Methods : Fifteen cases of instability of the shoulder were included with an average follow-up of 2 years (range: 1$\~$3 years). There were 13 men and 2 women with an average age of 27years. Multidirectional instability was found in 4 cases, voluntary instability in 3 cases, bony Bankarte lesion in 2 cases and 6 cases were contact sportmen. Thirteen shoulders underwent the inferior capsular shifts and Bankart repairs and 2 shoulders without Bankart lesion underwent the inferior capsular shift only. Average 19 mm of shift (range: 10$\~$25 mm) was done. Results : Fourteen patients showed good and excellent results with one subluxation and one positive apprehension test. Postoperative ranges of motions did not change in forward elevation, external rotation at side and external rotation at 90$^{\circ}$ abduction (p>0.05). Conclusion : Inferior capsular shift procedure using splitting subscapularis and capsule can be helpful in shoulder instability patients who were high-risk group of recurrence with arthroscopic procedure.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.6B
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• pp.859-866
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• 2010

Digital vessels can occur large a disaster at sea because vessels in fire and collision in case of certain unforeseen circumstances. In this paper, We propose digital vessel context monitoring system through risk analysis. We propose environment information analysis system using wireless sensor that have to acquire marine environment and context of marine digital vessel. For conducting simulation, we chose 300 data sets to train the neural network. As a result, we obtained about 96% accuracy for fire risk context and we obtained 88.7% accuracy for body of vessel risk context. To improve the accuracy of the system, we implement a FEC (Forward Error Correction) block. We implemented digital vessel context monitoring system that transmitted to diagnosis result in CDMA.