제 4 주제 : 영 호남 대학간 학술교류 및 네트워크 구축방안 / 양인영

양인영 영남대학교 영남지역발전연구소 2000 영남지역발전연구 Vol.26 No.-

CFRP 모자형 부재의 축 압궤 특성에 관한 연구

양인영,박준우,이길성 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

The most important purpose in designing vehicles is currently to focus on environment-friendly, economical, safety performance aspect. As for the environment-friendly and economical aspect, the issues are the overall movements toward lightweight vehicle production because of the fuel-efficiency improvement and heavier restriction on exhaust, however in contrast, the issues of the safety performance such as crush, comfort level and multi-functional programs lead to increase of vehicle weight. Therefore, the designing vehicles should be more interested in the aspect of securing safety performance, but at the same time, it also should consider reducing weight of structural member of vehicle. In this study, to lower the weight of side members, CFRP side members were manufactured by CFRP uni-direction prepreg sheet. The stacking condition related to the energy absorption of composite materials is being considered as an issue for the structural efficiency. Therefore, the axial collapse tests were conducted by changing the stacking condition such as fiber orientation angle and interlaminar number. In this paper the results of experimental works pertaining to the orientation angle and interlaminar number characteristics of CFRP(Carbon Fiber Reinforced Plastic) hat shaped section members that were subjected to static axial compressive loading are presented.

온도변화에 따른 CFRP 적층재의 충격손상에 관한 실험적 연구

양인영,박효균,차천석 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

In this paper, the effects of temperature change (low and high temperature) on the impact damages of CFRP laminates was experimentally studied. Composite laminates used for this experiment are CF/EPOXY orthotropic laminated plates, which have two-interfaces [0˚_6/90˚_6]_s and [0˚₄/90˚₄]_s. and CF/PEEK orthotropic laminated plates, which have two-interfaces [0˚₄/90˚₄]_s. And, this study aims experimentally to present the interrelations between the impact energy vs. impact damages (i.e. delamination area and matrix crack) of CFRP laminates (CF/EPOXY, CF/PEEK) subjected to FOD(Foreign Object Damage) under various temperatures.

Instructional Effects on Voice Onset Time Perception in L2 Speech Segmentation

양인영 서울대학교 언어교육원 2017 語學硏究 Vol.53 No.3

This study examined the effects of instruction on the English word boundary perception of Korean learners of English. The focus of this study was the appropriate use of Voice Onset Time (VOT) of English voiceless stops (p, t, k) in word initial (e.g., top) and after word initial s position (e.g., stop) signaling the presence and absence of a word boundary before the stop consonant. There were 48 participants in the study, who were assessed three times: before instruction (pre-test), immediately after instruction (post-test), and five weeks after instruction (delayed post-test). Results revealed that participants’ perceptual accuracy improved significantly in both VOT positions in segmentation after instruction. However, the improvement was more prominent in word initial than after word initial s. Among word initial stop consonants, velar stops were the most difficult to acquire, while after initial s, bilabial stops were the most difficult and alveolar stops were the easiest to acquire.

集中衝擊荷重을 받는 平板의 衝擊應力 解析

梁仁榮,金善奎,朴貞秀 조선대학교 동력자원연구소 1991 動力資源硏究所誌 Vol.13 No.2

In this paper, an attempt is made to analyze the impulsive stresses directly underneath the concentrated impact point for a supported square plate by using the three-dimensional dynamic theory of elasticity and the stress function (potential theory of displacement) on the supposition that the Load, Fo sinwt, acted on the central part of it. The results obtained from this study are as follows; 1. The impulsive stresses cannot be analyzed directly underneath the acting point of concentrated impact Load in previous theories, but can be analyzed by using the three-dimensional dynamic theory of elasticity and the potential theory of displacement. 2. Theorically, with increasing the pulse width of applied load, it was possible to clarify that the amount of stress in the point of concentrated impact load was in-creased and that of stress per unit impulse was decreased. 3. The numerical inversion of Laplace transformation by the use of the F.F.T. algo-rithm contributes the reduction of c.p.u, time and the improvement of the accuracy of results.

CFRP 적층재의 잔류피로굽힘강도에 미치는 열습의 영향

양인영,박노식,임광희 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2

This paper evaluates the static and fatigue bending strengths of CFRP(carbon fiber reinforced plastic) laminates subjected to hygrothermals. The specimens which had different stacking composition, orthotropic and quasi-isotropic laminated plates, were prepared for this experiment. A steel ball launched by the air gun collides against CFRP laminates to generate impact damages, and the 3-point fatigue bending test is carried out by using the impacted laminates to investigate the influence of hygrothermals on the effect on the residual bending fatigue strength of CFRP laminates.

충격하중을 받은 CFRP적층판의 손상거동과 잔류 굽힘피로강도 ( Damage Behavior and Residual Bending Fatigue Strength of CFRP Composite Laminates Subjected to Impact Loading )

양인영,임광희 대한기계학회 1995 대한기계학회 춘추학술대회 Vol.- No.-

연료전지 무인기의 에너지 저장 장치 최적화

양인영,이보화 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11

연료전지 및 이차전지, 태양전지를 탑재하고 4.5시간 동안 비행하는 무인기에 대하여 에너지 저장 장치인 연료전지 및 이차전지의 중량을 최적화하기 위한 계산을 수행하였다. 주어진 탑재물 중량에 대하여 비행체의 크기 및 중량, 비행에 필요한 에너지 및 동력을 계산하는 모델을 작성하였다. 이를 이용하여 전체 비행체 중량을 최소화하는 연료전지 대 이차전지의 중량비를 구하였다. 탑재물 중량 1 kg 및 기타 입력값을 가정하고 계산한 결과 연료전지와 이차전지의 중량비가 6.3:1일 때 전체 비행체의 중량이 15.5 kg으로 최소가 되었다. Weights of energy storage devices are optimized for a UAV carrying a fuel cell, a secondary battery and a solar cell, and using the first two as its energy storage. For a given weight of payload and flight endurance, UAV size and weight, and its required energy and power are calculated using a simulation model. The weight ratio of the fuel cell and battery is optimized using this model to minimize the total weight of the UAV. Given the payload weight of 1 kg and other input parameters assumed, the total weight is minimized as 15.5 kg when the weight ratio of the fuel cell and battery is 6.3:1.

취성재료의 충격파괴에 관한 연구 I

양인영,정태권,정낙규,이상호 대한기계학회 1990 대한기계학회논문집 Vol.14 No.2

In this paper, a new method is suggested to analyze impulsive stresses at loading poing of concentrated impact load under certain impact conditions determined by impact velocity, stiffness of plate and mass of impact body, etc. The impulsive stresses are analyzed by using the three dimensional dynamic theory of elasticity so as to analytically clarify the generation phenomenon of cone crack at the impact fracture of fragile materials (to be discussed if the second paper). The Lagrange's plate theory and Hertz's law of contact theory are used for the analysis of impact load, and the approximate equation of impact load is suggested to analyze the impulsive stresses at the impact point to decide the ranage of impact load factor. When impact load factors are over and under 0.263, approximate equations are suggested to be F(t)=Aexp(-Bt)sinCt and F(t)=Aexp(-bt) {1-exp(Ct)} respectively. Also, the inverse Laplace transformation is done by using the F.F.T.(fast fourier transform) algorithm. And in order to clarity the validity of stress analysis method, experiments on strain fluctuation at impact point are performed on a supported square glass plate. Finally, these analytical results are shown to be in close agreement with experimental results.

An Exploratory Study of Acoustic Cues in Stop Production in Gangneung Korean

양인영,박성석 서울대학교 언어교육원 2023 語學硏究 Vol.59 No.1

This study investigated voice onset time (VOT) in Korean stop consonants and the fundamental frequency (f0) of post-stop vowels in Gangneung Korean (a tonal variety). These aspects were compared with those of Seoul Korean (non-tonal), considering phonation types, place of articulation, and vowel context. Twenty speakers provided a total of 1,620 speech samples, and 3,240 measurements were taken. Linear mixed effect modeling was conducted using R. The results showed that Gangneung and Seoul speakers produced similar VOTs for aspirated and lenis stops but revealed f0 differences among phonation types despite the gradual loss of pitch accent in young Gangneung Korean speakers. Place of articulation and vowel context effect did not vary significantly between dialects. This paper discusses the implications for the ongoing changes in VOT and f0 in stop productions in tonal languages.