• Kyungpook Mathematical Journal
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• 제63권3호
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• pp.463-484
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• 2023

An examination is conducted on the multinomial coefficients derived from generalized quantum deformed algebras, and on their recurrence relations. The 𝓡(p, q)-deformed multinomial probability distribution and the negative 𝓡(p, q)-deformed multinomial probability distribution are constructed, and the recurrence relations are determined. From our general result, we deduce particular cases that correspond to quantum algebras considered in the literature.

• 대한족부족관절학회지
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• 제2권1호
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• pp.42-47
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• 1998

The conventional surgical treatment for deformed foot has always consisted of massive soft tissue releases combined with varying methods of osteotomies and fusions to plantigrade functional foot. But, the resulting feet have often been foreshortened, stiff, and nothing more than a cosmetically acceptable but functionally poor foot. Now the techniques of distraction histogenesis has been given a new tool to apply to the complex foot deformity. We have recently experienced two cases of severe deformed feet and treated with Ilizarov technique. One patient had postcompartmental severe rigid equinocavovarus foot. And the other had traumatic severe rigid metatarsus abductus. The follow up periods were 14 and 28 months respectively. The feet were aesthetically pleasing. So, we believed that the Jlizarov technique is an excellent treating method for severe deformed foot.

• 대한수의학회지
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• 제44권1호
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• pp.1-5
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• 2004

The fused and deformed lumbar vertebrae (L) of Thoroughbred horses were observed macroscopically. Results revealed five L in two cases, and six L in three cases. In two cases, the last two lumbar vertebrae were fused with each other. One case of the fused lumbar vertebra was observed in a horse with five L and the other in that with six L. In one case, the facet of second last lumbar vertebra was articulated with its anterior lumbar vertebra. On the other hand, four cases had the caudal border on the lateral tip of the lumbar transverse process partially overlapped with the cranial border of the following lumbar transverse process. In these cases, cranial and caudal tubers were formed on the overlapped part of the lumbar transverse process.

• 한국전산구조공학회논문집
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• 제15권4호
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• pp.715-725
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• 2002

본 연구에서는 연직하중을 받는 평면 케이블의 처짐 형상을 결정하는 기법을 제안하였다. 케이블의 일반정리에 의하여 케이블의 처짐 형상을 구하는 경우 임의의 한 점에서 처짐이 기지값으로 주어져야 하지만, 본 연구에서는 이러한 처짐값이 주어지지 않는 일반적인 경우에 대하여 케이블의 정리와 기하학적 적합조건식을 토대로 케이블의 처짐 형상을 반복계산에 의해 결정하는 기법을 제시하였다. 또한, 본 기법은 케이블의 신장을 고려하는 경우에도 적용이 가능하도록 확장하였다. 본 연구의 기법으로 케이블의 신장이 발생하지 않는 경우에 대한 해석과 신장이 발생하는 경우에 대한 실내 모형실험 및 해석을 수행한 결과 제안한 기법이 타당한 것으로 판명되었다.

• Journal of Mechanical Science and Technology
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• 제20권12호
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• pp.2079-2086
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• 2006

A fundamental study for developing a fault diagnosis system of a pump is performed by using neural network. Acoustic signals were obtained and converted to frequency domain for normal products and artificially deformed products. The neural network model used in this study was 3-layer type composed of input, hidden, and output layer. The normalized amplitudes at the multiples of real driving frequency were chosen as units of input layer. And the codes of pump malfunctions were selected as units of output layer. Various sets of teach signals made from original data by eliminating some random cases were used in the training. The average errors were approximately proportional to the number of untaught data. Neural network trained by acoustic signals can detect malfunction or diagnose fault of a given machine from the results.

• 한국CDE학회논문집
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• 제21권2호
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• pp.143-150
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• 2016

In shipbuilding, hull assemblies are manufactured by welding. The thermal deformation caused by the welding produces shape deformation. Counter-deformed design methods have been used in shipyards to cope with the weld-induced deformation of ship assembles. Finite element methods (FEMs) are frequently used to estimate welding distortion in the counter-deformed design. For the estimation of welding distortion, producing uniform rectangular elements is required to enter thermal loads on the welding line and obtain accurate analysis results. In this paper, a new automatic mesh generation method is proposed for prediction of welding deformation in FEM. Meshes are constructed for test cases to demonstrate the feasibility of the proposed mesh generation method.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2004년도 Proceedings of 2004 Korea-Japan Joint Seminar on Particle Image Velocimetry
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• pp.135-140
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• 2004

Several studies have utilized physical models of the healthy nasal cavity to investigate the relationship between nasal anatomy and airflow. With our experiences of experimental investigations on nasal airflows in normal and abnormal nasal cavity models, we are going to deal with the topic that may contribute to the diagnosis and treatment of nasal diseases. In this paper, airflows in the normal and artificially deformed models, which simulate surgical treatment, are investigated experimentally by PIV. High-resolution CT data and careful surface rendering of computational model with the help of the ENT doctor provide more sophisticated nasal cavity models. The CBC PIV (Correlation Based Correction PIV) algorithm with window offset is used for PIV flow analysis. Average and RMS distributions in sagittal and coronal sections are obtained for inspiratory and expiratory nasal airflows. Comparisons in nasal airflows for both normal and deformed cases are also appreciated. In case of simulations of surgical operations, velocity and RMS distributions in coronal section changes locally, this may cause some difficulties in physiologic functions of noses and may hurt mucosal surface.

• Archives of Plastic Surgery
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• 제36권2호
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• pp.167-173
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• 2009

Purpose: The key points of treatment of cryptotia are the elevation of invaginated ear helix and the correction of deformed cartilage. Prevention of stabilized cartilage contouring from returning to the previous state is also important. The authors carried otoplasty by modified Onizuka's method or Ohmori's method that conchal cartilage graft or high density polyethylene implant(MEDPOR$^{(R)}$) graft served as fixation after spreading posterior aspect of adhered antihelix and a splint for prevention of recurrence of cartilage deformities. The aim of this study is to reveal the availability of the high density polyethylene implant(MEDPOR$^{(R)}$) graft for the correction of cryptotia. Methods: We have repaired 17 cryptotic deformities using cartilage graft from cavum of concha(12 cases) or high density polyethylene implant(5 cases) for correction of deformed cartilage. We investigate the operative time, complications, and satisfaction of postoperative ear shape on both autogenous cartilage graft group and high density polyethylene implant graft group. Results: There was 1 case of reinvagination on autogenous cartilage graft group. Implant exposure was occurred on high density polyethylene implant graft group, as 1 case. These were statistically no differences between autogenous cartilage graft group and high density polyethylene implant graft group to the satisfaction of ear shape. Conclusion: High density polyethylene implant(MEDPOR$^{(R)}$) present an alternative to autogenous material as they allow of fibrovascular ingrowth, leading to stability of the implant and decreased infection rates. The correction of deformed cartilage by using the high density polyethylene implant(MEDPOR$^{(R)}$) is a good option for the treatment of cryptotia.

• 한국자동차공학회논문집
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• 제17권2호
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• pp.49-56
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• 2009

In this study, a side collision accident reconstruction using database based on the deformed shape information from the collision test using model cars is suggested. A deformation index and angle index related to the deformed shape is developed to set the database for the collision accident reconstruction algorithm. Two small size RC cars are developed to carry out the side collision test. Several side collision tests according to the velocity and collision angles are performed for establishing the side collision database. A high speed camera with 1000fps is used to capture the motion of the car. A side collision accident reconstruction algorithm is developed and applied to find the collision conditions before the accident occurs. Two collision cases are tested to validate the database and the algorithm. The results obtained by the reconstruction algorithm show good match with original conditions with regard to the velocity and angle.

• 한국지반공학회논문집
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• 제15권4호
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• pp.167-173
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• 1999

본 논문에서는 전면부 변형형태에 따른 보강토옹벽의 파괴거동을 탄소봉 모형 실험장치를 이용하여 실험적으로 연구하였다. 실험에서는 모형 보강토 벽체의 전면판 변형 형태를 상부변형, 수평변형, 하부변형 등 3종류로 나누어 실시하였다. 변형된 벽체의 파괴선을 육안으로 확인하기 위하여 사진촬영 기법을 이용하였다. 실험결과 상부변형의 조건일 경우 파괴선은 포물선의 형태를,수평이동의 조건일 경우 파괴선은 매우 큰 원호의 형태를 보였으며, 하부변형의 조건일 경우 파괴선은 직선화된 대수나선형태를 보였다. 현재 설계에 많이 사용되고 있는 복합중력식 설계법의 가상파괴선은 하부변형 조건의 파괴선과 가장 유사한 형태를 보였다.