• 한국정밀공학회지
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• 제18권2호
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• pp.146-151
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• 2001

The effects of slant interface in the hybrid specimen on the dynamic crack propagation behavior have been investigated using dynamic photoelasticity. The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamic stress field around the dynamically propagating inclined interface crack tip in the three point bending specimens. The dynamic load is applied by a hammer dropped from 0.08m high without initial velocity. The dynamic crack propagation velocities and dynamic stresses field around the interface crack tips are investigated. Theoretical dynamic isochromatic fringe loops are compared with the experimental reults. It is interesting to note that the crack propagating velocity becomes comparable to the Rayleigh wave speed of the soft material of a specimen when slant angle decreases.

• 한국광학회지
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• 제33권6호
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• pp.310-316
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• 2022

Presampled 변조전달함수(MTF) 측정에서 slant 표적각도 변화에 따라 MTF 결과의 차이가 있음을 확인하였고, 표적각도 변화에 대한 오차를 줄이기 위하여 획득한 edge spread function 그래프를 fitting하여 측정값의 오차를 줄일 수 있는 측정기법을 연구하였다. Presampled MTF 방법의 특성상 표적이 회전함에 따라 투영되는 공간주파수의 강도분포는 표적의 회전각도에 따라 변화하며, 이로 인하여 MTF 차이가 발생함을 확인하였다. 이 연구에서는 획득한 영상의 1개의 열에 대해서만 fitting을 한 후 MTF를 계산하였다. Fitting을 이용한 계산은 기존의 presampled MTF 방법과 비교하여 표적 회전에 따른 오차가 줄어듬을 확인하였다. 이 방법은 MTF를 이용한 자동 초점 등 다양한 각도의 표적에 응용이 가능할 것으로 기대된다.

• 오토저널
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• 제15권2호
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• pp.112-120
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• 1993

Variable thickness plates are commonly encountered in the majority of mechanical/structural components of industrial applications. And, as a result of the unsymmetry of the structure or the load and the anisoptropy of the materials, the cracks in engineering structures are generally subjected to combined stresses. In spite of considerable practical interest, however, a few fracture mechanics study on combined mode crack in a variable thickness plate have carried out. In this respect, combined mode 1/3 stress intensity factors $K_{1}$ and $K_{3}$ at the crack tip for a variable thickness plate were obtained by 3-dimensional finite element analysis. Variable thickness plates containing a central slant crack were chosen. the parameters used in this study were dimensionless crack length .lambda. crack slant angle .alpha, thickness ratio .betha. and width ratio .omega. Stress intensity factors were calculated by crack opening displacement(COD) and crack tearing displacement(CTD) method proposed by Ingraffea and Manu. The effect of thickness ratio .betha. on $K_{1}$ is relatively great in comparison to $K_{3}$.

• 패션비즈니스
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• 제11권1호
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• pp.61-74
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• 2007

Photographic measurement was first made with the subjects of 190 males in their 20s residing in the Ningbo area, Zhejiang Province in China. In this second report, lower body shapes were classified and discriminated by using indirect measurement, measurement items, and lower body analysis. The following sums up the research: 1. The subjects were $8.85^{\circ}$ (hip breadth angle), $1.58^{\circ}$ (abdomen upper angle), $11.80^{\circ}$ (hip upper angle), and $5.12^{\circ}$ (lateral lower body posture angle). 2. The subjects of Chinese males in their 20s showed three types of lower bodies: Bow Legs & Slight Slant of Lateral Lower Body Type (30.5%)-gap between legs, curve waist-hip contour, average abdomen-hip profile, and lateral lower body posture were slightly slanted forward. Adjacent Straight Legs & Slight Slant of Lateral Lower Body Type (35.8%)-adjacent straight between legs, curve waist-hip contour, slim abdomen-hip profile, and lateral lower body posture were slightly slanted forward. Balance Legs & Large Slant of Lateral Lower Body Type (33.7%)-average between legs, straight waist-hip contour, protruding hip profile, and lateral lower body posture were largely slanted forward. 3. Eight useful variables for the categorization of the subjects' lower body types were chosen through stepwise discriminant analysis, and the hit ratio of discrimination was 97.9%.

• ETRI Journal
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• 제31권3호
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• pp.271-281
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• 2009

This paper presents a novel multiband microstrip-fed right angle slot antenna design technique for multiple independent frequency bands. The new technique uses various slot sizes at various appropriate positions. We first propose a tri-band slot antenna consisting of three right angle slots. Then, a quad-band slot antenna is developed with four right angle slots which achieves slant ${\pm}45^{\circ}$ linear polarization, omnidirectional pattern coverage, good antenna gain, and acceptable impedance bandwidths over all the operating frequency range. Moreover, an open-circuited tuning stub is introduced to achieve good impedance matching. Both proposed antennas are designed on a ground plane of RT/duroid 5880 substrate with a thickness of 1.575 mm. The real measurable results show that the desired frequencies used in wireless communication systems, namely, WLAN and WiMax, are efficiently achieved.

• 대한기계학회논문집B
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• 제22권11호
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• pp.1625-1634
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• 1998

The objective of this study is to establish geometric guidelines for design of impaction parts prepared for removing undesirable effects of fuel deposition on a wall in small direct-injection diesel engines. In order to get the guidelines a new wall geometry is introduced and assessed, which has a flat top and a slant edge. The size of the flat top and the angle of the slant edge are varied and tested in same chamber condition, then their effects on spray dispersions and drop sizes are discussed. The results show that the case of 3.0mm flat top and $60^{\circ}$ edge angle gives the best spray characteristics for a small combustion chamber in the test conditions chosen in this paper.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권1_2호
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• pp.93-102
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• 2003

본 논문에서는 한글의 구조적 특징이 반영된 획들의 통계적인 분포에 근거한 필기 문자열의 기울기 보정 방법을 제안한다. 기존의 기울기 보정 방법들은 대부분 영문위주의 보정 방법으로, 영문과 달리 2차원적 구조를 갖는 한글에 적용하는데는 많은 문제가 있다. 일반적인 보정 방법을 적용할 경우 한글에 내재하는 강한 대각선획의 영향으로 인한 역보정의 문제가 가장 많이 나타나며. 기울어진 문자열을 제대로 보정하지 못하는 경우도 빈번하다. 제안하는 방법에서는 추출된 획들의 기울기 분포를 K-평균 군집법을 적용하여 수직획과 대각선획의 두 개의 군집으로 분류하고, 가우시안 분포로의 모델링을 통해 대각선획을 제외하고 수직획만을 이용하여 기울기 보정을 수행하였다. 임의의 필기자에 의해 필기된 우편봉투 주소 문자열 1,300개에 대해 제안하는 방법과 기존의 방법들을 적용하여 실험한 결과 제안하는 방법이 기존방법들에 비해 역보정률을 크게 낮추고, 기울어진 문자열에 대해 완벽한 보정 성능을 보여 그 우수성이 입증되었다.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2010년도 춘계학술대회
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• pp.128-129
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• 2010

기존의 고도계는 레이더 특성에 의해 직하부의 높이 값을 정밀하게 관측할 수 없었다. 그러나 레이더 간섭 고도계는 SAR(Synthetic Aperture Radar) 영상의 칩 펄스(Chirp Pulse)를 이용한 고정밀 경사거리(Slant Range Distance)관측, 도플러 효과를 이용한 고정밀 경사각(Squint Angle)의 관측 및 레이더 간섭기법(SAR Interferometry)을 이용한 고정밀 관측각(Look Angle)의 관측을 가능하게 하였다. 이 연구의 목적은 레이더 간섭 고도계의 효율적인 신호처리 기법의 개발에 있다.

• 대한수학회지
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• 제33권1호
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• pp.121-136
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• 1996

Met $\tilde{M} = (\tilde{M}, \tilde{J}, <>)$ be an almost Hermitian manifold and M a submanifold of $\tilde{M}$. According to the behavior of the tangent bundle TM with respect to the action of $\tilde{J}$, we have two typical classes of submanifolds. One of them is the class of almost complex submanifolds and another is the class of totally real submanifolds. In 1990, B. Y. Chen [4], [5] introduced the concept of the class of slant submanifolds which involve the above two classes. He used the Wirtinger angle to measure the behavior of TM with respect to the action of $\tilde{J}$.

• Archives of Plastic Surgery
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• 제43권4호
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• pp.321-327
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• 2016

There are many women who want larger and brighter eyes that will give a favorable impression. Surgical methods that make the eye larger and brighter include double eyelidplasty, epicanthoplasty, as well as lateral canthoplasty. Double eyelidplasty produces changes in the vertical dimension of the eyes, whereas epicanthoplasty and lateral canthoplasty create changes in the horizontal dimension of the eyes. Epicanthoplasty, a surgical procedure which enlarges the eye horizontally, is performed at the inner corner of the eye, whereas lateral canthoplasty enlarges the outer edge of the eye. In particular, if the slant of the palpebral fissure is raised and the horizontal dimension of the palpebral fissure is short, adjusting the slant of the palpebral fissure through lateral canthoplasty can achieve an enlargement of eye width and smoother features. Depending on the patient's condition, even better results can be achieved if this procedure is performed in conjunction with other procedures, such as double eyelid-plasty, epicanthoplasty, eye roll formation surgery, fat graft, and facial bone contouring surgery. In this paper, the authors will introduce in detail their surgical method for a cosmetic lateral canthoplasty that lengthens the lateral canthal angle and corrects the outer tail of the eyes, in order to ease the unfavorable impression.