• 한국의류학회지
• /
• 제46권6호
• /
• pp.1074-1087
• /
• 2022

This study reports an optimization of a 3D printed wrist brace (WB) for various tilting angles (0°, 45°, 90°) of the re-entrant (RE) pattern and thickness (2 mm, 4 mm) using thermoplastic polyurethane (TPU) filaments and thermoplastic elastomer (TPE) filaments. The actual printing time, weight, Poisson's ratio, and tensile property of the manufactured samples were analyzed. The results confirmed that the actual printing time and weight increased with increasing thickness, regardless of the filament type. All tilting angles of the WB showed a negative Poisson's ratio (NPR), the largest of which appeared at 90°. The results of the tensile property analysis showed that a 90° tilting angle also had the largest value of elongation and stress. From these results, we conclude that the most suitable wrist brace is one in which the actual printing time is low, the weight is minimized to a thickness of 2 mm, and the tilting angle of the RE pattern is 90° for good shock absorption. The choice of filaments may be decided upon according to the user's preference, since the TPU is stiff and the TPE is elastic.

• 대한치과보철학회:학술대회논문집
• /
• 대한치과보철학회 2003년도 춘계학술대회 및 제1회 한일 공동 학술대회
• /
• pp.90-90
• /
• 2003

• 대한핵의학회:학술대회논문집
• /
• 대한핵의학회 1966년도 제5회 학술대회
• /
• pp.90.1-90.1
• /
• 1966

• 한국환경생물학회:학술대회논문집
• /
• 한국환경생물학회 2005년도 추계학술대회 초록집
• /
• pp.90-90
• /
• 2005

• 생약학회지
• /
• 제30권2호
• /
• pp.137-144
• /
• 1999

Torilin was isolated from haxane fraction of Torilis Fructus extract. Torilin produced inhibition of the acetic acid-induced and phenylquinone-induced writhing syndrome at the oral doses of 30 and 90 mg/kg in mice. It also increased the pain threshold at the oral doses of 30, 90 and 270 mg/kg in the tail pressure method and the Randall-Selitto method. However, it did not show a hypothermic action at the oral doses of 30 and 90 mg/kg in mice. The compound exhibited strong anticarrageenan activity at the oral doses of 90 and 270 mg/kg in rats, and had inhibitory effect on the vascular permeability at the oral doses of 30 and 90 mg/kg in mice. It also showed potent inhibition of leucocyte emigration in CMC-pouch at the doses of 3 and 9 mg/rat, sc. The acute toxicity of torilin was very weak: the $LD_{50}$ values were more than 5000 mg/kg, po and 2000 mg/kg, ip in mice. From the above mentioned results, it was suggested that torilin had potent analgesic and anti-inflammatory activities.

• 한국양식학회지
• /
• 제6권2호
• /
• pp.63-69
• /
• 1993

여러 규모의 적조 현상이 1970년대 말부터 우리나라 대부분의 패류 및 어류 양식장이 있는 남해안에서 일어나고 있다. 경남 충무의 북신만도 이곳 중의 하나로 1980년대 초부터 매년 적조가 나타나고 있다. $1990\~1991$년 사이에 양식 생물의 대량 폐사가 이곳에 나타났고 이때의 우점 적조 생물 종은 90년 11월과 91년 6월에 Leplocylindrus danicus, 90년 12월과 91년 8월에는 Skeletonema costatum, 그리고 91년 8월에는 Nitzschia seriata, 91년 7월에는 Gymnodinium splendens로 기록되었으며 적조 시기의 최대 클로로필-a 량은 $265.7{\mu}/l$였다. 이렇게 빈번하게 발생하는 적조 현상은 부근 해역의 부영양화와 관계 있으며 적조와 부영양화의 상관 관계에 대하여 본 논문에서 논의하였다.

• 대한전자공학회논문지
• /
• 제24권2호
• /
• pp.183-189
• /
• 1987

The performance of frame synchronization can be represented by the values of three characteristic variables-average misframe interval, average syncloss detection time, average reframe time. In this paper, we have analyzed the performance of frame synchronization of the standardized 90Mb/s optical transmission system by Markov chain method, with the suggestion of an extended algorithm for performance improvement. Maximum average reframe time of 1.18 ms can be obtained by the suggested algorithm, which is compared with that of 2.28 ms for the existing algorithm.

• 에너지협의회보
• /
• 통권11호
• /
• pp.32-36
• /
• 1989

• 한국안전학회지
• /
• 제30권6호
• /
• pp.12-17
• /
• 2015

In this study, the collapse characteristic of CFRP/Al compound square tube was investigated experimentally. The conclusions are as follows; The impact collapse characteristic of CFRP/Al compound square tube was found to be the most superior stacking conditions $[90^{\circ}]_8$. It showed that a very stable collapse mode was crushing. In the member with $[0_2{^{\circ}}/90_2{^{\circ}}]_s$ and $[90_2{^{\circ}}/0_2{^{\circ}}]_s$, stacking conditions, $0^{\circ}$ fibers were splayed to the external by laminar bending, while the $90^{\circ}$ fibers were held between the folds of the aluminum member by laminar bending, local buckling and transverse crack. In the member with $[45_2{^{\circ}}/45_2{^{\circ}}]_s$ stacking conditions, fibers were held between the folds of the aluminum member by local buckling and transverse crack.

• 한국자동차공학회논문집
• /
• 제14권1호
• /
• pp.79-85
• /
• 2006

CFRP(Carbon Fiber Reinforced Plastics) of the advanced composite materials as structural materials for vehicle, has a wide application in light-weigh structural materials of airplanes, ships and automobiles because of high strength and stiffness, However, there is a design variable to be considered in practical application of the laminate composite materials, these materials are vulnerable to transverse impact. This paper is to study the effects of stacking sequence and curvature on the penetration characteristics of composite laminate shell. They are stacked to $[0_3/90_3]S,\;[90_3/0_3]s\;and\;[0_2/90_3/0]s,\;[90_2/0_3/90]s$ and their interlaminar number two and four. They are manufactured to various curvature radius (R=100, 150, 200mm and $\infty$), When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determing the time for it to pass two ballistics-screen sensors located a known distance apart. The critical penetration energy of specimen A and B with less interfaces were a little higher than those of C and D. As the curvature increases, the critical penetration energy increases linearly because the resistance to the in-plane deformation as well as bending deformation increases, which need higher critical penetration energy. The specimen A and C have higher critical penetration energy than B and D because of different stacking sequences. We examined crack length through a penetration test. For the specimen A with 2interfaces, the longest circumferential direction crack length were observed on the first interface from the impact point. For the specimen B 4-interface, the longest circumferential direction crack length were observed on the second interface from the impact point.