• 한국의상디자인학회지
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• 제23권1호
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• pp.129-142
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• 2021

This study aims to identify the perception of New-Hanbok one-piece dresses that female consumers have purchased and to analyze the design preference based on design types and brands. Analysis was conducted on New-Hanbok brand websites, and additional research was carried out through a survey of 402 women in their 20s and older. The survey consisted of 36 questions, which were divided into categories including pattern, color, material, and recognition of the one-piece dress. The research results are as follows. First, the preferred design form of the New-Hanbok one-piece dress was long length, medium fit, princess line, round git, rectangular git, regular width git, V neckline, regular width dongjeong, front closing with a wide overlap of the chest are a, narrow goreum, a skirt part with moderate crease spacing and number of pleats, A-line skirt silhouette, long and narrow sleeves, diagonal shoulder line, and a cuff at the end of each sleeve. Second, the preferred colors of the New-Hanbok one-piece dress were bright, neutral, or light and were predominately monochromatic Third, the preferred fabric conveyed a contemporary atmosphere through its print pattern. The most favored fabric material was cotton. Through this study, more systematic design development research should be carried out focusing on the current situation and identifying problems, thereby improving traditional culture.

• Journal of Dental Anesthesia and Pain Medicine
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• 제22권6호
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• pp.427-435
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• 2022

Background: This study aimed to investigate the relationship between pharyngeal morphology and the success or failure of blind nasotracheal intubation using standard lateral cephalometric radiography and to analyze the measurement items affecting the difficulty of blind nasotracheal intubation. Methods: Assuming a line perpendicular to the Frankfort horizontal (FH) plane, the reference point (O) was selected 1 cm above the posterior-most end of the hard palate. A line passing through the reference point and parallel to the FH plane is defined as the X-axis, and a line passing through the reference point and perpendicular to the X-axis is defined as the Y-axis. The shortest length between the tip of the uvula and posterior pharyngeal wall (AW), shortest length between the base of the tongue and posterior pharyngeal wall (BW), and width of the glottis (CW) were measured. The midpoints of the lines representing each width are defined as points A, B, and C, and the X and Y coordinates of each point are obtained (AX, BX, CX, AY, BY, and CY). For each measurement, a t-test was performed to compare the tracheal intubation success and failure groups. A binomial logistic regression analysis was performed using clinically relevant items. Results: The items significantly affecting the success rate of blind nasotracheal intubation included the difference in X coordinates at points A and C (Odds ratio, 0.714; P-value, 0.024) and the ∠ABC (Odds ratio, 1.178; P-value, 0.016). Conclusion: Using binomial logistic regression analysis, we observed statistically significant differences in AX-CX and ∠ABC between the success group and the failure group.

• 한국의류학회지
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• 제48권3호
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• pp.563-575
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• 2024

This study analyzed 2D bodice sloper changes according to combinations of the lateral neck and shoulder points of a 3D mannequin's shoulder lines. The relationship between the 3D shape and 2D pattern was analyzed. The shoulder line was set to a default of 1cm in front of or behind the lateral neck point, 1cm in front or behind the lateral shoulder point and 1cm vertically above the lateral neck or shoulder point. When the lateral neck point was moved backward, the front neck depth, front and back shoulder height, and shoulder length in the 3D shape increased, whereas the back neck's depth and width decreased. In the 2D pattern, the back shoulder height decreased. As the lateral shoulder point moved backward, all items of the 3D shape showed little change. However, the front shoulder height for the 2D pattern decreased. Consequently, the back shoulder height increased, and the lateral neck point was raised vertically by 1cm. Meanwhile, only the back neck depth and shoulder length decreased while all other items increased; however, in the 2D pattern, the front neck width and shoulder line showed no notable change. The shoulder point was raised vertically by 1cm, and the front and back shoulder heights of the 3D shape and 2D pattern were decreased.

• Journal of Advanced Marine Engineering and Technology
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• 제32권8호
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• pp.1248-1256
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• 2008

In this paper, basic characteristics of transmission line employing PPGM (periodically perforated ground metal) were investigated using theoretical and experimental analysis.According to the results, unlike the conventional PBG (photonic band gap) structures, the characteristic impedance of the transmission line employing PPGM structure showed a real value, which exhibited a very small dependency on frequency. The transmission line employing PPGM structure showed a loss (per quarter wave length) higher by $0.1{\sim}0.2\;dB$ than the conventional microstrip line. According to the investigation of the dependency of RF characteristic on ground condition, the RF characteristic of the transmission line employing PPGM structure was hardly affected by the ground condition in the frequency lower than Ku band, but fairly affected in the frequency higher than Ku band, which indicated that coplanar waveguide employing PPGM structure was optimal for RF characteristic and reduction of size. Considering above results, impedance transformer was developed using coplanar waveguide with PPGM structure for the first time, and good RF characteristics were observed from the impedance transformer. In case that {\lambda}/4$ impedance transformer with a center frequency of 9 GHz was fabricated for a impedance transformation from 20 to10 {\Omega}$, the line width and length were 20 and $500\;{\mu}m$, respectively, and its size was only 0.64 % of the impedance transformer fabricated with conventional microstrip lines. Above results indicate that the transmission line employing PPGM is a promising candidate for a development of matching and passive elements on MMIC.

• 대한토목학회논문집
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• 제36권5호
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• pp.847-856
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• 2016

최근 우리나라는 고도의 경제 성장과 더불어 급격한 도시화로 인하여 인구, 환경, 주택문제가 발생하고 있고, 특히 교통문제는 심각한 사회 문제로 대두되고 있는 실정이다. 현재까지의 교통정책 방향은 차량소통 중심으로 시행되어 온 것이 현실이다. 이에 본 연구에서는 운전자 관점이 아닌 보행자 관점의 교통정책의 필요성을 부각시키고자 한다. 2015년 전체 교통사고 사망자수(4,621명) 대비 보행 중 사망자수(1,795명) 비율은 38.8%로 보행자 교통사고 해결 방안 수립이 요구되고 있다. 횡단보도는 보행자가 안전하게 횡단할 수 있어야 하지만 현행 횡단보도의 폭원 산정 및 정지선 설치위치에 대한 명확한 기준 없이 도로의 폭을 기준으로 설치되어 있다. 특히 보행량이 많은 대학교나 상업시설 주변 지역은 횡단보도 설계 시 보행자 통행을 고려하지 않고 설계되고 있는 실정이다. 횡단보도 녹색시간 동안 수용할 수 있는 보행자 통행량보다 실제 통행량이 많을 경우, 대기 보행자가 주어진 녹색시간 동안 횡단하지 못하거나 주어진 횡단보도 면적을 벗어난 상태로 무리하게 횡단하여 교통 안전상의 문제가 발생할 수 있다. 이에 본 연구에서는 차량소통 위주의 신호시간 결정, 보행 신호시간 부족, 대로 상에서의 보행자 횡단거리 등 많은 문제점을 내재하고 있는 횡단보도 내 보행자 사고율을 낮추고자 보행자 통행량과 보행속도를 고려한 횡단보도 제원을 산정하고자 한다. 먼저 횡단보도 제원 산정을 위해 횡단보도, 보행자, 정지선에 관한 법규와 기존 연구문헌을 고찰하였다. 기존 횡단보도 제원과 정지선의 문제점을 분석하여 횡단보도 제원 산정을 위한 방법론을 제시하고, 이를 토대로 횡단보도 제원을 산정하였다. 결론적으로 본 연구에서 제시한 횡단보도 제원 및 정지선 개선방안은 해당 교통안전시설물 설치 및 기준 정립 시 기초 자료로 활용 가능할 것으로 기대된다.

• 대한원격탐사학회지
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• 제35권6_1호
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• pp.933-944
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• 2019

이 연구에서는 영상레이더(synthetic aperture radar; SAR) 이중차분간섭기법(Double-Differential Interferometric SAR; DDInSAR)을 이용하여 남극 로스 빙붕(Ross Ice Shelf)의 동쪽(A지역)과 서쪽(B지역)에 위치한 육지 경계부 지역의 조위변형을 분석하고, 조위예측 모델의 정밀도와 빙붕의 영률(Young's modulus) 추정을 위해 2015-2016년에 획득된 총7장의 Sentinel-1A SAR 영상을 획득하였다. 먼저, 남극 로스해(Ross Sea)에 대한 대표적인 조위예측 모델인 Ross Sea Height-based Tidal Inverse (Ross_Inv) 모델과 DDInSAR영상에서 추출된 빙붕의 조위변형을 비교한 결과, 모델의 조위예측 오차는 동쪽에서는 3.86 cm로 분석되었으며 조위모델에서 역기압효과가 필수적으로 보정되어야 함을 확인하였다. 그러나 서쪽에서는 역기압효과 보정 후에도 큰 오차가 발생하여 조위모델이 부정확할 수 있음을 확인했다. 또한, 조위변형이 나타나는 힌지 영역(hinge zone)의 폭과 얼음두께의 상관성을 나타내는 1차원 탄성 보 모델에 의거하여 얼음의 영률을 계산하였다. 이를 위해 DDInSAR 영상에서 조위에 의한 변위가 나타나기 시작하는 곳을 지반선(grounding line)으로, 조위에 의한 최대변위가 나타나는 지점을 힌지선(hinge line)으로 새롭게 정의했고, 이두선 사이를 힌지 영역으로 정의했다. 반무한 평면체를 가정한 1차원 탄성 보 모델에 의하면 힌지 영역의 폭은 얼음두께의 0.75승에 정비례한다. DDInSAR에서 나타나는 힌지 영역 중 지반선과 힌지선이 직선에 가까운 지역에서 힌지 영역의 폭을 측정하였고, 이를 BEDMAP2 얼음 두께의 0.75승과의 선형 회귀 분석을 통해 로스 빙붕 동쪽과 서쪽 힌지 영역의 영률을 1.77±0.73 GPa로 추정할 수 있었다. 이러한 방법으로 향후 Sentinel-1 영상이 축적되면 더 정밀한 영률을 추정할 수 있을 것으로 기대된다.

• International Journal of Precision Engineering and Manufacturing
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• 제8권4호
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• pp.50-55
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• 2007

Stereolithography (SLA) is a technique using a laser beam to cure a photopolymer liquid resin with three-dimensional computer-aided design (CAD) data, The accuracy of the prototype, the build time, and the cured properties of the resins are controlled by the SLA process parameters such as the size of the laser beam, scan velocity, hatch spacing, and layer thickness, In particular, the size of the laser beam is the most important parameter in SLA, This study investigated the curing properties of photopolymers as a function of the laser beam size, The cure width and depth were measured either on a single cure line or at a single cure layer for various hatch spacings and laser beam sizes, The cure depth ranged from 0.23 to 0.34 mm and was directly proportional to the beam radius, whereas the cure width ranged from 0.42 to 1.07 mm and was inversely proportional to the beam radius, The resulting surface roughness ranged from 1.12 to $2.23{\mu}m$ for a ratio of hatch spacing to beam radius in the range 0.5-2.0 at a beam radius of 0.17 mm and a scan velocity of 125 mm/sec.

• 한국관개배수논문집
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• 제21권1호
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• pp.118-126
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• 2014

In this study, the use of the spur of riverbank technique is being investigated. The spur of the riverbank typically reduces the velocity of flow and protects the embankments by increasing friction along the water and the banks. This also has an effect in the rise of water level upstream. It is also used for the rectification of riverside line and restoration of the waterway through sedimentation near the spur of the riverbank. In this study, physical-scaled experiments are conducted to investigate the process of creating a mild meandering channel using the spur of the riverbank with varying water flows and sedimentation functions. The hydraulics observations are taken with respect to the varying heights and length of the riverbank's spurs and the distance between each spur for the formation of the mild meandering channel. It is observed that for 1.06 times of the meander length, it requires 2 times of the interval with each spur of river width. Similarly, 1.25L times of the meander length, it requires 0.5 times of the interval with each spur of river width. The sand accumulation is induced by the spur of riverbank when the spur of riverbank's heights are more than 40% of water depth and the length of the spur of riverbank needs under than 20% of river width for avoid exaggerated sand accumulation in the center of channel.

• Journal of Welding and Joining
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• 제13권4호
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• pp.122-131
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• 1995

An automatic welding equipment for thick plates requires the capability of the seam tracking of the weld line which often includes misalignment of the workpiece and variation of groove width. In this study, an automatic welding equipment and control algorithms based on the arc sensor were proposed for the GMA welding of thick plates which had misalignment and gap variation. The developed system being constituted with 5 axis can be automatically controlled by computer and also automnatically set the welding conditions such as welding current, and voltage. The proposed algorithms for the seam tracking in multi-pass welding of the thick plates were constituted as follows : the detection of weaving-end point for findng the variation of groove width, the control of welding velocity for acquiring a constant thickness deposition of weld metal, and the calculation of groove width and height of an arbitrary pass in the multi-pass weld. As results of the application of the system, it was revealed that the system had a good capability in seam tracking and made an excellent weld quality in V groove butt joint.

• 소성∙가공
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• 제15권4호
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• pp.311-318
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• 2006

One of the most important quality problems in flat plate leveled from hot rolled coils in cut-to-Iength lines is bowing and cambering when they are cut in small width parts. It is verified analytically and experimentally that residual stress remained in plate is th ε source of the problem. In order to produce low residual stress flat plate from hot rolled coils, the proper conditions of leveling are studied and two things are implemented. One is proper plastic deformation area ratio to reduce residual stress within customer requirement by applying suitable plastic deformation and maintain leveling load within structural strength limit of leveler. The other is maintaining uniform plastic deformation along the width of the plate during leveling. Customer requirement for residual stress is met by applying above 70% of plastic deformation area ratio and uniform deformation along width of coil by adjusting back up rolls according to deformation analysis of work roll and back up roll assembly and leveling tests.