• 대한치주과학회:학술대회논문집
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• 2002.11a
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• pp.38-38
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• 2002

• The Journal of the Korean dental association
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• v.12 no.6
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• pp.377-379
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• 1974

A rare case of two supernumerary teeth on the lingual side of the upper central incisors was observed in a 17 year old korean male. The characteristics were as follow : 1) The site of the occurrence was on the lingual side of upper central incisors. 2) The sizes of both supernumerary teeth were smaller than the normal incisor teeth and quite different from the normal incisors in the tooth shape. 3) A diastema was seen between the maxillary central incisors, and the right incisor exhibited labioversion and left incisor exhibited some mesial inclination.

• The Journal of the Korean dental association
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• v.48 no.12
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• pp.880-888
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• 2010

Periodontal disease, trauma, deformity of tooth can jeopardize the esthetics of oral and maxillo-facial region. Moreover, increasing the demand and concern about the esthetics, clinicians should place high value on esthetics during periodontal treatment. Analysis of various anatomical considerations; lip line, shape and location of marginal gingiva, and biologic width; and diagnosis should be performed prior to periodontal plastic surgery.

• The Journal of the Korean dental association
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• v.57 no.12
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• pp.768-777
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• 2019

Alveolar bone resorption are unpredictable and always occur after tooth extraction. Such bone resorption causes insufficient alveolar ridge which make implant placement difficult. There are many techniques to increase the alveolar ridge. Representative procedures include ridge split, guided bone regeneration, bone graft using autogenous block bone, and alveolar distraction. In each procedure, there are indications and complications. Depending on the shape and the width of bone defects, we can choose procedures for horizontal bone augmentation and vertical bone augmentation.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.30-32
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• 1994

In this paper, in order to design Linear Pulse Motor(LPM) effectively, the flux density and the thrust force of LPM have been calculated in the air gap by using Finite Element Method(FEM). The kinds of magnetic circuit arc the variable reluctance(VR), hybrid(HB), and permanent magnet(PM) type. Tooth and slot shape arc rectangular, wedge head(tapcr; 10, 20 degree), and semi-circle type.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.693-696
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• 2011

The SRM (Switched Reluctance Motor) is composed of silicon steel plates where the rotor structure is simple and laminated without coil winding or permanent magnet, making it mechanically robust and its maintenance and repair excellent. Applying SRM as traction motor for railway vehicle is given consideration because of its ruggedness capability in severe loading condition and its compact structure. Optimal design of SRM is needed to reduce torque ripple to apply SRM for railway traction drive because SRM has high torque ripple. In this paper, switched reluctance motor with three different stator pole shapes is taken for magnetic analysis using 3d finite element method to apply SRM as traction drive for railway vehicle. It is observed that the model 3 added Tooth Tang Depth and Slot Round to stator shape gives the improved inductance and torque characteristic.

• Proceedings of the KIEE Conference
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• 1991.11a
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• pp.83-86
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• 1991

This paper presents a method that optimizes the teeth shape of linear induction motor. Independent variables are x-coordinate change of four nodes at each tooth, and its objective function is thrust at start. As a result, linear induction motor with high quality which its thrust increases up to 10% per pole can be designed.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.26 no.6
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• pp.681-683
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• 2000

The purpose of this study was to investigate the characteristics of mesiodens among children in Korea. The study population consisted of 20 children whose ages ranged from 4 years to 26 years. The characteristics of mesiodens were obtained from radiographs and clinical examination results, and were confirmed by surgical intervention. Results showed that males were affected four times as frequently as female. Thirty-five percent of the patients had more than one supernumerary tooth. About 67% of the mesiodens were conical in shape and about 34% of the mesiodens were in the upward position. The age and sex distribution, number of mesiodens per patient, shape, direction, size, and effect on permanent upper incisors are also presented in this study.

• Journal of the Korean Society for Precision Engineering
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• v.29 no.3
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• pp.319-323
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• 2012

Transmission is one of the important pars to transmit power from engine to wheels. Mass reduction gears can make the engine power requirement reduce, and can make dynamic performance and fuel efficiency of vehicle improve. Transmission gears are modified for mass reduction without changing their tooth shapes, face widths, and modules by using shape optimization and re-check process. Also structural stability is verified by FEA.

• Proceedings of the KIEE Conference
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• summer
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• pp.1046-1048
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• 2004

Inductance is an important parameter determining the characteristics of current waveform in electric motors. There are many kinds of inductances, however, self and mutual inductances are the major components. These inductances are changed under the variation of the magnetic circuit, current, frequency etc., even in the same winding distribution. Therefore this paper deals with the characteristics of inductance according to the shape of stator tooth. The analysis model is newly developed motor made of SMC(Soft Magnetic Composite) to reduce the core loss in high speed. the result of this paper gives the basic understandings of inductance to extend the applications of the motors.