• 한국해안해양공학회지
• /
• 제5권3호
• /
• pp.198-203
• /
• 1993

유공방파제의 반사특성을 규명하기 위하여 파고 및 주기가 다른 여러 규칙파를 대상으로 유수실의 폭과 유공벽의 형태를 변화시키며 수리실험을 수행하였다. 실험결과, 유공방파제의 반사특성은 유수실 폭과 유수실내 파장의 비(B/L$_{c}$)에 민감하게 반응하며, B/L$_{c}$가 0.2인 부근에서 최소의 반사율을 보임을 알 수 있었다. 이러한 현상은 주로 유수실내에서의 공진현상에 기인한 것으로 판단된다. 유공벽형태(종슬리트, 횡슬리트 또는 원형 구멍)의 변화는 반사율면에 있어서 약간의 변화를 초래할 수는 있어도, 전반적인 반사특성 변화에는 영향을 주지 못함을 확인하였다.하였다.

• 수산해양기술연구
• /
• 제46권2호
• /
• pp.115-125
• /
• 2010

In order to design the optimal escape vent for the coon strip shrimp pot, the tank experiments were conducted with the model pot of five different slit height and slit width, respectively. The optimal height and width of escape vent were determined to 20mm and 40mm by tank experiments, respectively. These were determined by the 50% selection carapace length which was denoted to 25mm in selectivity curve. The escape experiments were conducted to determine a number of escape vent with the original shrimp pot to be set the designed escape vent from 2 vents to 10 vents increasing at intervals of 2 vents in tank. The optimal number of escape vents denoted 8 vents. Therefore, to apply the escape vent in commercial shrimp pot will be efficient to reduce small size shrimps to catch.

• 한국의상디자인학회지
• /
• 제18권1호
• /
• pp.169-181
• /
• 2016

This study analyzed the characteristics and patterns of men's drawers panties to get basic data for their design. For this, drawers panties in 7 different brands (4: domestic brands, 3: imported brands) in terms of a front-center shape were collected, and the shape of men's drawers panties, characteristics of the materials, dimensions & type of patterns by the part and front-center patterns were analyzed. The study results found the followings: First, in terms of the shape of men's drawers panties, the front-center part were designed to rest the penis and scrotum in a natural and comfortable manner without a pee slit. They were seamless on the sides except for one product with side seams. Second, the drawer panties were made of elastic polyurethane materials. Specifically, domestic brand items used warm, elastic and durable nylon, polyester and rayon and polyurethanes while imported brands were mostly made of absorbent and sanitary polyurethanes. Third, regarding a size of drawer panties by part, imported brands were large in waist circumference. In terms of waist breadth at the front center, there was difference depending on an oval type. In addition, the front length at the front center differed by product, revealing difference in three-dimensional effect at the front center. The side length also differed greatly by product, which means that there might be a great difference in wear comfort. Fourth, in terms of the patterns of men's drawers panties, there was difference in side seams, center back seam and front-center patterns. Among a total of 7 products, only one product had side seams, and center back seams were found in two products only. Fifth, in terms of front-center patterns, the drawer panties can be divided into three types, creating three-dimensional effect not to give any pressure on the crotch: i) the cutting line only at the bottom of the front center part where the penis is rested, ii) puff created at the front center by adding a transverse line to the center line, iii) cutting transverse line to separate the penis from the testicles.

• 한국산학기술학회논문지
• /
• 제10권2호
• /
• pp.303-312
• /
• 2009

본 논문에서는 UWB 통신용 CPW 급전 디스크 섹터 안테나를 설계하고 제작한다. 또한 디스크 섹터 안테나의 부채꼴에 사각형 슬릿을 삽입하여 E-평면에서 방향성을 갖도록 하였다. 안테나의 입력 임피던스는 안테나를 구성하는 파라미터인 디스크 섹터의 반경, 디스크 섹터의 중심각, 접지면의 길이와 급전선 부근의 접지면 모서리의 길이를 변화시켜서 $50{\Omega}$을 갖는 급전선과 정합시켰다. 설계된 UWB 통신용 안테나의 크기는 $72mm{\times}26mm$이고, 시뮬레이션을 통한 안테나의 대역폭은 $3{\sim}13GHz$이다. 측정결과로부터 대역폭은 $1.98{\sim}11GHz$이고 제작된 안테나의 반사손실과 이득은 3.5GHz에서 -50.88dB, 1.34dBi, 5.5GHz에서 -12.27dB, 3.35dBi, 8GHz에서 -23.2dB, 3.8dBi이고 10GHz에서 -16.17dB, 5.2dBi를 갖는다.

• 한국강구조학회 논문집
• /
• 제18권4호
• /
• pp.417-426
• /
• 2006

최근에 강바닥판 교량에서 여러 가지 피로손상이 보고되고 있는데, 이들 대부분의 피로 손상은 윤하중의 직접 재하에 의한 강바닥판의 복잡한 구조거동에 기인한다. 따라서 본 연구에서는 강바닥판교의 세로 리브와 가로리브 용접이음부와 데크 플레이트와 세로리브 용접이음부의 피로손상원인을 구조해석에 의해 분석한 후, 피로를 고려한 구조상세를 제안하기 위해 데크 플레이트 두께, 가로리브 스켈럽 상세, 가로리브 이음길이를 변수로 하는 구조해석을 수행하였다. 이들 연구결과로부터 이들 구조상세에 대한 피로거동특성을 파악하고, 피로강도가 향상된 구조상세를 제안하였다.

• 한국의류산업학회지
• /
• 제21권1호
• /
• pp.67-74
• /
• 2019

This study aims to investigate the relation between pressure, 3D length change, and subjective pressure sensation in sports brassieres. Seven Korean women in their 20s and 30s were chosen as subjects. In the experiment, the subjects evaluated four types of sports brassieres wherein the lower band was changed. The results of the study were as follows. The pressure according to the measurement position was lower at the front part than at the side and back parts (p<.05), and there was no difference in the pressure according to the brassiere type. It was observed that brassiere C, which had the higher extension band, was elongated more than the other brassieres when worn. In the case of brassiere B, which had a slit in the front center, it was observed that the 3D length of the front part changed very little as the slit spreads, and the back part stretched in a manner similar to those of the other brassieres. Subjective pressure sensation was statistically different only at the front and the side of the lower band. Brassiere B(with a silt) demonstrated the least subjective pressure sensation; the pressure sensation was high when wearing brassieres A and D (p<.05). Brassieres B and C were also preferred for overall comfort. In conclusion, it was observed that the substitution of material and morphological transformation affect subjective sensation.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 1996년도 추계학술대회 논문
• /
• pp.180-186
• /
• 1996

Using carbon steel or ceramic as a shaft material of monolithic and slited insert ring clamped on it. The fitting strengths of the sgrink fitted assemblies measured from room temperature to 30$0^{\circ}C$ and following conclusions were obtained as results of this investigation. 1) The fitting condition under which the shrink fitted assemble was stronger than that using simple fit in high temperature. 2) When both material of the 30mm-diameter shaft and 55mm-diameter boss are SM45C the clamping torque is increased 2.7times as the interference increases 3 times from 20${\mu}{\textrm}{m}$ at the contact length of 6mm monolithic fit. 3) When only the material of boss is changed to STS 304 the clamping torque is increased at the rate of 37.3N.m per 1mm increase of the contact length at the interference of 50${\mu}{\textrm}{m}$ monolithic fit.

• 대한조선학회지
• /
• 제25권4호
• /
• pp.39-46
• /
• 1988

The purpose of this paper is to apply the boundary element method to predict the crack growth path. The quarter point element with traction singularity at the crack tip is applied to compact tension type specimens and two inclined slit problems under compression load. The maximum stress criterion which was originally derived for the crack initiation is extended to the analysis of the crack propagation. The predicted crack paths with 1/4 crack growth increment of initial crack length agree quite well with experimental results. It is found that the computed crack path of the boundary element analysis is not mainly affected by the crack increment length.

• Journal of the Optical Society of Korea
• /
• 제19권6호
• /
• pp.555-559
• /
• 2015

Coherence length (time) is a key parameter in many classical and quantum optical applications. Two interferometers – Michelson and Young’s double-slit – are used to characterize the temporal coherence of single photons emitted from single terrylene molecules. For quantitative analysis, a dispersion-related distortion in the interference pattern of a Michelson interferometer is carefully corrected by a simple dispersion compensation. Additionally, it has been demonstrated that Young’s interferometer can be used in temporal coherence studies at the single photon level with high accuracy. The pros and cons of the two systems are discussed. The measured coherence lengths in the two systems are consistent with one another under the self-interference interpretations.

• Journal of applied mathematics & informatics
• /
• 제28권5_6호
• /
• pp.1315-1322
• /
• 2010

Let D be a plane domain whose boundary consists of n components and $C_1$, $C_2$ two boundary components of D. We consider the family $F_1$ of conformal mappings f satisfying f(D) $\subset$ {1 < |w| < ${\mu}(f)$}, $f(C_1)=\{|w|=1\}$, $f(C_2)=\{|w|={\mu}(f)\}$. There are conformal mappings $g_0$, $g_1({\in}F_1)$ onto a radial and a circular slit annulus respectively. We obtain the following theorem, $$\{{\mu}(f)|f\;{\in}\;F_1\}=\{\mu|\mu(g_1)\;{\leq}\;{\mu}\;{\leq}\;{\mu}(g_0)\}$$. And we consider the family $F_n$ of conformal mappings $\tilde{f}$ from D onto a covering surfaces of the Riemann sphere satisfying some conditions. We obtain the following theorems, {$\mu|1$ < ${\mu}\;{\leq}\;{\mu}(g_1)$} ${\subset}\;\{{\mu}(\tilde{f})|\tilde{f}\;{\in}\;F_2\}\;{\subset}\;\{{\mu}(\tilde{f})|\tilde{f}\;{\in}\;F_n\}$ and ${\mu}(\tilde{f})\;{\leq}\;{\mu}(g_0)^n$.