• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.245-249
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• 2009

According to the increase of intelligent vehicles many automotive electric components are installed. The wire harness which connects those also increases. The crimping process for compressing the copper wire bundle into the terminal is a key process to assure the good quality of wire harness. For the case of inadequate forming condition many shape failures such as less-filling, over-filling are happen in the crimping process. Even though the quality of crimping shape is satisfactory the quality check for electrical resistance of wire harness is sometime not satisfied the qualification due to large variation of electrical resistance of wire harness under climate test. This large variation is thought to be related with the malfunction automotive electric system and caused by the internal stress of wire, which occurred during the crimping process. In this paper we develop the 3D-FEM simulation scheme and design methodology of optimum terminal shape. Also the effect of terminal shape on the residual stress is discussed.

• Korean Chemical Engineering Research
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• 제48권4호
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• pp.462-469
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• 2010

기체와 액체가 만나는 2상 공정들은 화학공학, 생명화학공학, 환경공학, 식품공학 등에 두루 존재한다. 위와 같은 공정의 최적화를 위해서는 거품의 움직임과 형태에 대한 정확한 파악이 필요하다. 액체 내부에서 거품의 움직임은 액체의 밀도, 점도, 표면장력과 거품의 크기와 속도에 영향을 받는다. 본 논문에서는 고점도 실리콘 오일 내부에서의 거품의 움직임과 형태를 관찰하였다. 또한 국외 논문 및 저서에서 정립된 거품의 에너지 수지 식, 항력계수와 변형계수를 이용하여 거품의 종말속도, 항력계수, 변형계수, 형태를 예측해 보고 이를 실험결과와 비교해 보았다. 실험 결과 거품의 속도는 점도가 낮을 경우가 더 빨랐고, 거품의 항력계수는 점도가 클 때 더 컸다. 거품의 형태는 점도가 클 때 덜찌그러진(구형에 가까운) 형태였다. 실험결과와 국외 논문 및 저서에서 정립된 항력계수와 변형계수를 이용한 예측결과를 비교해 본 결과 Batchelor가 제시한 이론이 가장 정확한 예측을 하는 것으로 나타났다. Batchelor가 제시한 거품의 에너지 수지식, 항력계수와 변형계수를 사용하여 예측한 거품의 2차원 측면 형태는 실험에서 관찰된 거품의 2차원 측면 형태와 유사하였다.

• 대한한의학원전학회지
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• 제28권4호
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• pp.79-97
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• 2015

Objectives : To research origin of the shape of vital gate(命門) in Yixuerunmen makes us understand more exactly what the author, Li Chan(李梴) thought vital gate shaped. Methods : It's shape described in his book was compared with pictures portraying it in Hua Tuo Xuan Men Nei Zhao Tu(華陀玄門內照圖), one of references of his book. Results : He reasonably modified its passing track, while explaining it according to the paintings in Hua Tuo Xuan Men Nei Zhao Tu. Vital gate, as he thought, was not an real organ like the other five viscera, but a cord or a tube similar to blood vessels. He believed its cord had long connections from pericardium to terminal of urethra, which went through pericardium upward, right kidney downward, right around terminal rectum down-frontward, and urethra in parallel outward. Conclusions : He had consistent understandings for vital gate to penetrate several different viewpoints, as based on pictures in Hua Tuo Xuan Men Nei Zhao Tu.

• 한국가시화정보학회지
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• 제22권1호
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• pp.61-67
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• 2024

In this study, the behavior of water droplets on a solid-infused surface was evaluated by quantifying a water droplet's contact angle, sliding angle, and terminal velocity. The contact angle hysteresis and sliding angle of water on the solid-infused surface were measured to be lower than those of the hydrophobic PTFE surface. It led to the enhancement of the initiation of the water droplet's movement. When the capillary number was lower than Ca < 0.004, the terminal velocity of the water droplet on the solid-infused surface was higher than the PTFE surface due to the low contact line resistance. However, the transition of the droplet morphology from a hemispherical shape to a streamlined teardrop shape beyond Ca > 0.004 lost the effect of reducing frictional resistance on the solid-infused surface.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 초전도 자성체
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• pp.25-28
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• 2002

Contact type Ic measurement system is needed to measure Ic continuously for long Bi-2223 tapes. Voltage and current terminals were designed several shapes for 4-probe method Ic measurement. Voltage terminals were made with brass and current terminals were made with Cu. We used 2 kinds of Bi-2223 tapes with different strength. When we measured Ic of Bi-2223 tape with Ag-Mg sheath, The proper weight was 0.3 kg and sharp pin type was better. according to voltage terminal shape and load. In case of Bi-2223 tape with Ag-Mn sheath, the proper terminal weight was 4 kg and sharp pin type was bad. It was possible to make continuous contact type Ic measurement system because We could get proper data - terminal shapes and loads - through these experiments.

• 한국산학기술학회논문지
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• 제13권6호
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• pp.2720-2728
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• 2012

최근 유연한 디스플레이, 고용량 메모리 및 집적기술의 발전으로 가변형태의 미래형 단말기가 개발되고 있다. 이때 디스플레이의 크기 및 안테나 성상의 변화는 사용자의 QoS 및 통신환경의 변화와 관계가 깊다. 특히 사용자의 의도는 단말기의 모양변화 및 안테나 개수의 증감으로 표현되는데 기지국이 지능적으로 의도를 파악하여 적응적으로 다중안테나 기법을 변경하여 적용함으로써 단말기 사용자의 QoS를 효과적으로 만족시킬 수 있다. 그러므로 본 논문에서는 미래형 단말기의 활용시나리오를 분석하여 거기에 맞는 적응적인 MIMO기법을 사용함으로써 채널용량을 최대화 시키는 동시에 사용자의 QoS를 만족시킬 수 있는 의도 인식 통신시스템을 제안한다.

• Design & Manufacturing
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• 제10권1호
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• pp.36-40
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• 2016

Connectors transmit electric signals to different parts in compact mobile display products. As products that apply this have become lightweight and smaller in size, there are growing demands for smaller and more integrated connectors, which are internal parts of the products. As a measure to address these demands, there is the planar array connector that minimizes the part by arranging the single-direction BTB connectors to two directions. As connectors become smaller in size and more highly integrated, maintaining intensity to prevent defects during impact and maintaining adhesive force to smoothly transmit electric signals are growing in importance. Thus, in order to identify the impact of concave shaping on improving adhesive power in connector terminal pins as a method to increase the connecting power of planar array connector terminal pins, this study predicted and examined the concave shaping method, number of concave shapes, and the adhesive power according to the size of the concave shape through CAE. For concave shaping, the model that added concave shaping towards the lower part of the connector terminal pin and added spokes for the area pressed down by the concave shaping was 0.74 N, showing increased adhesive force compared to existing models. Furthermore, when applying two concave shaping, rather than just one, there was a tendency for adhesive force to increase. In the case of adhesive power trends according to the size of the concave shaping, adhesive power increased and the width of the concave shape decreased, and the biggest adhesive force trends were shown when the concave shaping depth was 0.01mm.

• 한국공간구조학회논문집
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• 제15권4호
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• pp.49-56
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• 2015

The roof grid of single-layer space frame structure, for Energy Core of Incheon Airport Second Terminal, is very simple and aesthetic, but it is apt to buckle under external force because of mild curvature and complex shape. The object of this study is to estimate the stability of single-layer space frame structures for Energy Core of Incheon Airport Second Terminal with the analytical conditions of structural design. The results show that the buckling load of model(pin-pin, uniform load, rigid joint), that is, the most similar model to the analytical conditions of structural design. was $10.7kN/m^2$.

• Progress in Superconductivity
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• 제3권2호
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• pp.218-223
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• 2002

The void volume fraction of cables is one of the effective parameters to characterize the joints of superconducting magnet. Because electrical resistance and cooling stability in the CICC (Cable-in-Conduit Conductors) joint are governed by the void volume fraction, it should be controlled constantly in the termination of cable. The change of cross-section shape in the cable was fecund during the unidirectional compaction of terminal sleeve. The non-uniform thickness of the sleeve after compaction is expected because the loading is not taxi-symmetric, and the plastic flow is also not axi-symmetric. The CICC was compacted from 45% void volume fraction to 15% by using two-piece compaction jig, which could be pressed mini-directionally. Commercial code, ABAQUS, was used to analyze the plastic flow in the sleeve during the unidirectional compaction. The increment of radius of curvature of compaction jig could minimize the change of the deformed shape of cables. The calculated results were agreed with the experimental observations.

• Journal of Korean Neurosurgical Society
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• 제63권3호
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• pp.321-326
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• 2020

There has been confusion in the classification of terminal myelocystocele (TMCC) due to its diverse morphology and vague pathoembryogenesis. TMCC could be summarized as having the essential features of an elongated caudal spinal cord extruding out of the dorsal extraspinal space that fuses with the subcutaneous fat, which is in the shape of a trumpet-shaped cerebrospinal fluid-filled cyst. The extraspinal portion of the extruded spinal cord is nonfunctional. The morphological features suggest that TMCC is formed during secondary neurulation, specifically the failure of the degeneration of the secondary neural tube near the time of the terminal balloon. This review discusses the definition, as well as the clinical and surgical features, of TMCC with special emphasis on its pathoembryogenesis.