• Proceedings of the KWS Conference
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• 2004.05a
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• pp.232-233
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• 2004

강구조물 제작 시 용접프로세스에 의해 용접부 근방에 불균일한 온도분포가 발생하여 용접변형이 발생된다. 이러한 용접변형은 좌굴강도와 피로강도를 저하시킬 뿐 아니라 구조물의 크기와 형상을 변화시켜 이를 교정하거나 수정하기 위해 추가작업을 실시해야함으로 생산성을 저하시키는 주요한 요인이 되고 있다. (중략)

• Journal of KIISE:Software and Applications
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• v.35 no.6
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• pp.386-391
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• 2008

Some spoken word errors that violate grammatical or writing rules occurs frequently in communication environments like mobile phone and messenger. These unexpected errors cause a problem in a language processing system for many applications like speech recognition, text-to-speech translation, and so on. In this paper, we proposed and implemented an automatic correction system of ill-formed words and word spacing errors in SMS sentences that has been the major errors of poor accuracy. We experimented three methods of constructing the word correction dictionary and evaluated the results of those methods. They are (1) manual construction of error words from the vocabulary list of ill-formed communication languages, (2) automatic construction of error dictionary from the manually constructed corpus, and (3) context-dependent method of automatic construction of error dictionary.

• The korean journal of orthodontics
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• v.40 no.1
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• pp.16-26
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• 2010

Objective: The purposes of this study were to evaluate the force and stress depending on the type, deflection and thickness of the materials and to evaluate the mechanical properties of thermoplastic materials after repeated loading. Methods: Four types of thermoplastic products were tested. Force until the deflections of 2.0 mm and the stress when the materials were restoring to its resting position were evaluated. The mechanical properties of thermoplastic materials evaluated after 5 repeated loading cycles. Results: The interaction was observed between the thickness and the deflection (p < 0.05) from the regression equation. Thickness and amount of deflection rather than products and materials showed the largest effect on force and stress. In all products, at least 159 gf of force was required for more than 1.0 mm deflection or when materials with 1.0 mm thickness were deflected. The stress recorded was more than 19 gf/$mm^2$. During repeated loading, each group showed significant difference on the force and the stress (p < 0.01), 10 - 17% reduction of force and 4 - 7% reduction of stress in average. Conclusions: Proper thickness of thermoplastic materials and deflection level of tooth movement should be decided for the physiologic tooth movement. Force decay after repeated loading should be considered for the efficient tooth movement.

• Journal of the Society of Naval Architects of Korea
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• v.33 no.1
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• pp.206-213
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• 1996

Longitudinal deformation due to welding of built-up beams must be straightened for attachment with plates. Straightening of deformation is carried out by much experienced workers and requires much time and labor. In this study, a procedure to calculate the required reverse curvatures to straighten the welding deformation is presented and a method to simulate the fabrication procedures for the built-up beams is developed for the purpose of improvement of productivity.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.117-124
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• 2015

Purpose: The purpose of this study was to compare the accommodative function of young adult in their 20s wearing monovision, modified monovision, and aspheric multifocal contact lenses at near task. Methods: Thirty young adults ($23.53{\pm}2.37years$) were fitted with monovision, modified monovision (the application of single vision contact lenses and center-near low addition aspheric multifocal contact lenses), and aspheric center-near multifocal contact lenses. After wearing these modalities during a week for adaption, and after watching visual display at computer for inducing accommodative pressure for 1 hour. The following assessments of accommodative function were made: contrast visual acuity (VA) at distance and near; accommodative response; near accommodative facility; and negative relative accommodation (NRA)/positive relative accommodation (PRA). All measurements were carried out binocularly. Results: In binocular distance VA with contrast of 10%, monovision was the worst among the four modalities (p=0.005). In accommodative response at 1 m (1.00 D), monovision was the lowest (p<0.05) and accommodative response at 40 cm (2.50 D) with monovision was lower than that of modified monovision and multifocal contact lens (p<0.05). We also found that there were no significant differences in accommodative facility and NRA/PRA among the four modalities. Conclusions: In young adult (20s), monovision with low add reduced the accommodative response at near task, however, modified monovision and multifocal lens with center-near type did not affect accommodative relaxation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1991.11a
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• pp.139-145
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• 1991

본 논문에서는 chamfer가 없는 경우에도 조립이 가능한 로봇 조립용 손목기구를 개발하였다. 손목기구에서는 chamfer있는 경우에 우수란 적응능력을 가지는 RCC(Remote Center Compliance) 구조가 이용되었으며 위치측정용 sensor와 공압 actuator를 이용하여 조립시 생기는 RCC 구조의 변형을 측정하여 이로부터 능동적으로 오차를 교정하도록 하였다. sensor signal로부터 적절한 오차교정방향을 찾아내는 algorithm 으로는 신경회로망을 이용하였으며 이 결과 손목기구의 비선형성에도 잘 적응함을 볼 수 있었다. 제작된 로봇 조립용 손목을 이용하여 chamferless part의 조립을 실험한 결과 clearance ratio가 0.02인 경우 eccentricity가 2mm 까지 오차교정이 가능함을 볼 수 있었다.

• The korean journal of orthodontics
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• v.36 no.5
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• pp.360-368
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• 2006

Objective: Surface characteristics of dental materials play an important role in bacterial adhesion. The purpose of this study was to investigate surface characteristics of 5 different light-cured orthodontic adhesives (1 fluoride-releasing composite, 3 non-fluoride-releasing composites, and f resin-modified glass ionomer). Methods: Surface roughness was measured using a confocal laser scanning microscope. Contact angle and surface free energy components were analyzed using the sessile drop method. Results: Surface roughness was significantly different between adhesives despite a relatively small variation (less than $0.05\;{\mu}m$). Lightbond and Monolok2 were rougher than Enlight and Transbond XT. There were also significant differences in contact angles and surface free energy components between adhesives. In particular, considerable differences in contact angles and surface free energy components were found between resin modified glass ionomer and the composites. Resin modified glass ionomer showed significantly smaller contact angles in 3 different probe liquids and had higher total surface free energy and stronger polarity, with notably stronger basic property than the composites. Conclusion: Resin modified glass ionomer may provide a more favourable environment for bacterial adhesion than composite adhesives.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.27 no.1
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• pp.66-70
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• 2005

Cupid's bow, upper lip, columella, and ala of nose are esthetically important, in which their symmetrical plasties determine success or failure of the surgery in cleft lip and palate patients. Z-palsty and its modifications are simple and effective. The double Z-plasty is economical in surgical time and esthetics in reconstructing the cupid's bow compared with other methods. We report a 29-year-old male patient who represented reversed cupid's bow and whistle deformity after the primary repair of the cleft lip. He was corrected the cupid's bow using a double Z-plasty. The reversed cupid's bow was corrected to a normal shape and the whistle deformity disappeared. The tightness of the upper lip was relieved after the operation. The double Z-plasty was esthetically successful because the procedure was limited in the vermilion and did not produce a new scar on the skin. Furthermore, the lip tubercle became protuberant. The cupid's bow was symmetrically smoothly curved at 4 years after the operation. These results indicate that the double Z-plasty is simple, less traumatic to the surrounding tissues, and suitable for the correction of whistle deformity.

• Proceedings of The Korean Cleft Lip And Palate Association
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• 2004.06a
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• pp.8-14
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• 2004

• The Journal of the Korean dental association
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• v.30 no.4 s.275
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• pp.250-251
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• 1992