• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2005년도 제24회 춘계학술대회논문집
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• pp.431-434
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• 2005

데토네이션 파의 셀 구조를 모사하기 위한 격자 해상도 요구 조건을 파악하기 위하여 여러 영역의 데토네이션 현상에 대하여 반응 속도 상수와 격자 해상도를 바꾸어가며 일련의 해석을 수행 하였다. 서로 다른 영역의 데토네이션 현상에 대하여 정상 상태 ZND 구조와 계산 결과를 비교하여 살펴봄으로써, 최소 격자 크기와 계산 영역의 크기에 대한 결론을 도출하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 춘계학술대회 논문집
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• pp.249-252
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• 1997

Electroluminescence(EL) devices based on organic thin layers have attracted lot of interests because of their possible application as large-area display-emitting display. One of the problems of such devices is lifetime of the cell, where the degradation of the cell is partially due to the crystalliyzation of organic layers. In large part, this problem can be solved by using a multilayer device structure prepared by vapor deposition technique. In this study, blue light-emitting multilayer organic electroluminescence devices were fabricated vsing Poly (9-vinylcarbaEole) (PVK) and 2- (4-tert-butylphenyl)-5-(4$^{#}$-bis-phenyl) 1,3,4-oxadiazole (PBO) as hole trasport and electron transport material, respectively, where trim(8-hyd roxyquinolinate) aluminum (Al $q_3$) was used as a luminescenct material. A cell structure of glass sub- strate/indume-tin-oxide(ITO)/PCK/Al $q_3$/PBD/Mg:In was employed. Blue emission peak at 510nm was observed with this cell structure.e.

• 한국컴퓨터산업학회논문지
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• 제3권1호
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• pp.19-26
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• 2002

다양한 QoS를 갖는 트래픽을 위해, ATM 스위치의 출력버퍼에 저장되는 셀의 큐 구조를 제안하였다. 제안한 큐 구조는 기존의 고정길이 큐 구조의 문제점인 버스트 트래픽으로 인한 큐 넘침의 문제점을 개선하기 위해 실시간 트래픽과 비실시간 트래픽을 묶어 큐를 공유하여 큐 이용률을 최대화시키는 구조를 기반으로 하고 있다. 즉, CBR 트래픽과 VBR-nrt를 묶고, VBR-rt와 ABR 트래픽을 묶어 버스트 트래픽 유입으로 인한 셀 손실률을 최소화시킬 수 있는 특성을 제공한다. 제안 큐 구조의 성능을 평가하기 위해 버스트 특성이 강한 트래픽 패턴을 이용하여 기존의 큐 구조와 셀 손실률 및 평균 지연률을 비교하였다.

• 한국추진공학회지
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• 제12권3호
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• pp.68-75
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• 2008

이전에 개발된 병렬 해석 코드를 이용하여 원형 관내에서의 삼차원 데토네이션 파 전파 특성을 관찰 하였다. 일련의 해석을 통하여 직경이 일정한 원형 관에서 반응 속도 상수 값 k에 의존하는 데토네이션 셀 생성 메커니즘을 알 수 있었다. 삼차원 유동에 대한 비정상 유동의 해석 결과는 two-, three-, four-cell 구조의 메커니즘을 잘 보여주었으며, 반응속도 상수 k가 증가함에 따라 생성되는 셀 수가 증가하고 셀의 폭과 길이는 감소하였다. 모든 다중-셀 모드에서 데토네이션 파의 구조와 그을음막 기록은 횡단파의 움직임에 의하여 만들어지며, 데토네이션 파면은 주기적으로 일정한 다각형 및 풍차 형상을 가지게 된다.

• Advances in nano research
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• 제13권3호
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• pp.297-312
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• 2022

Coughing and breath shortness are common symptoms of nano (small) cell lung cancer. Smoking is main factor in causing such cancers. The cancer cells form on the soft tissues of lung. Deformation behavior and wave vibration of lung affected when cancer cells exist. Therefore, in the current work, phase velocity behavior of the small cell lung cancer as a main part of the body via an exact size-dependent theory is presented. Regarding this problem, displacement fields of small cell lung cancer are obtained using first-order shear deformation theory with five parameters. Besides, the size-dependent small cell lung cancer is modeled via nonlocal stress/strain gradient theory (NSGT). An analytical method is applied for solving the governing equations of the small cell lung cancer structure. The novelty of the current study is the consideration of the five-parameter of displacement for curved panel, and porosity as well as NSGT are employed and solved using the analytical method. For more verification, the outcomes of this reports are compared with the predictions of deep neural network (DNN) with adaptive optimization method. A thorough parametric investigation is conducted on the effect of NSGT parameters, porosity and geometry on the phase velocity behavior of the small cell lung cancer structure.

• 한국CDE학회논문집
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• 제2권3호
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• pp.142-149
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• 1997

This study is intended to develop a Feature based modeler. It is difficult to integrate CAD and CAM/CAPP with information that is given only by a conventional CAD system. Therefore a lot of studies have concentrated on a Feature based CAD system. But conventional Feature based modelers have had limitation on providing sufficient information related to Feature interaction. If a Feature based modeler is to be used in assembly simulation, a new Feature-based modeling method needs to be developed. Also to support collision detection between parts, we have to handle Feature interaction systematically. Therefore we suggest Cell data structure which handles interaction of Features by volume. The volume created by Feature interaction is saved as a Cell. With the Cell structure we solve problems involved with Feature interaction. This study shows how the Cell data structure can manage Feature interaction and give enough information in assembly simulation.

• Journal of Advanced Marine Engineering and Technology
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• 제30권2호
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• pp.231-238
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• 2006

The performance of free-breathing polymer electrolyte membrane fuel cell (PEMFC) was studied experimentally and the effect of cathode separator structure on the cell performance was investigated. Cathode separators were used for the cell with $18cm^2$ active area. In channel type, the contact resistance is low, and the nature convection. which is strongly affected by the cross-sectional shape of cathode separator channel, is dominant in a cell performance. The maximum power density with $18cm^2$ active area is $105mW/cm^2$ using the 10mm depth and 2mm width channel. A computational analysis was optimum structure of free-breathing channel type PEMFC for robotic application.

• 산업기술연구
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• 제12권
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• pp.25-36
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• 1992

In this paper, we simulate and calculate the stress and output voltage of the beam structure load cells by using FEM as varing physical structure parameters and loading positions. It is proved that stress enhance as the increase of the notch pitch and radius of the load cell, but decrease as the increase of the notch thickness and beam width. The results are good matched for basic formulas of the single fixed beam, and are verified our simulation is correct. Also, it is found that the stress characteristics of the load cell is varied according to loading positions with structure parameters, and caculated output voltage of the load cell approximate to those of the real manufactured ones. As a result, this study will offer efficient design and analysis technique for making special and variety capacity of load cells.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.597-599
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• 1995

We have analyzed the dielectrophoretic(DEP) force on a cell in a micro planar electrode structure. We fabricate a micro planar electrode structure using micro machining technology and measure the motion of a cell that is accelerated by DEP force. DEP force on a cell is calculated by curve fitting the motion of a cell. Radish and yeast are used for the experiment. In case of radish, DEP force is increased as the voltage and the frequency is increased, and in case of yeast, DEP force is increased only as the voltage is increased DEP force on a yeast does not vary when the frequency varies from 1 MHz to 3 MHz. The result will be helpful to the manipulation of cells using DEP force.

• 폴리머
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• 제27권6호
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• pp.509-520
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• 2003

입체규칙성이 다른 폴리프로필렌 (PP)의 결정화 거동을 비교하였다. 결정화 조건은 신디오택틱 폴리프로필렌 (sPP)과 아이소택틱 폴리프로필렌 (iPP)의 단위 결정 격자, 라멜라 구조, 구정의 성장에 영향을 주었다. 냉각속도가 증가할수록 결정 구조의 안정성이 감소하였으며, 냉각속도에 따른 구조적 변화는 iPP 가 sPP보다 크게 나타났다. sPP는 1 $^{\circ}C$/min 이하의 속도로 서냉될 때 body centered cell H의 fully antichiral packing 구조를 형성하였고 sPP가 primitive cellII구조를 형성할 때, 결정 격자와 라멜라 구조는 열이력의 영향을 작게 받은 것으로 확인되었다. 최대 결정화 온도에서 결정화 속도는 iPP가 sPP보다 빠르게 나타났다.