• Title, Summary, Keyword: Optimized length to width

Search Result 77, Processing Time 0.043 seconds

Development of Energy Optimized Geometry Using BIM for Super Tall Office Building in Early Design Stages (BIM을 이용한 건축물 초기 디자인 단계에서 초고층 업무용 건물의 최적 에너지 형태개발)

  • Ryu, Han-Soo;Kim, In-Han;Choo, Seung-Yeon
    • Korean Journal of Computational Design and Engineering
    • /
    • v.16 no.2
    • /
    • pp.83-91
    • /
    • 2011
  • There are many researches to make low-energy building. Lots of them focus on facility systems and insulation performance of building materials. However, not only systematic solutions but also approaches in early design stages are important to reduce energy consumption. Using BIM(Building Information Modelling) is considered as an effective and efficient way to simulate building energy and decide alternatives than traditional energy simulation because BIM based energy simulation makes to reduce much time for energy modeling. This study focuses on development of optimized geometry for super tall office buildings in Seoul, Korea. Specifically, length to width ratio and building orientation are main topics of this study because these two topics are the most basic and preceding factors deciding mass design. In this study, Revit MEP 2011 and Ecotect Analysis 2011 are used to make case models and calculate energy load in early design stages. Energy properties of material abide by Korean Standards for Energy Conservation in Building, Korean Guideline for Energy Conservation in Public Office and ASHRAE Standard in USA. This study presents best length to width ratio of plan and optimized orientation by evaluating the case models. Furthermore, this study suggests what should be considered for each case to decrease energy load.

The Deduction of the Optimal Length to Width Ratio of Dye-sensitized Solar Cell and the Fabrication of a Module (가로-세로 비율에 따른 염료감응형 태양전지의 최적 조건 도출 및 모듈 제조)

  • Kim, Hee-Je;Park, Sung-Joon;Choi, Jin-Young;Seo, Hyun-Woong;Kim, Mi-Jeong;Lee, Kyoung-Jun;Son, Min-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.58 no.1
    • /
    • pp.100-106
    • /
    • 2009
  • A novel 8 V DC power source with an external series-parallel connection of 50 Dye-sensitized Solar Cells (DSCs) has been proposed. One DSC has the optimized length to width ratio of $5.2{\times}2.6\;cm$ and an active area $8\;cm^2$ ($4.62{\times}1.73\;cm$) which attained a conversion efficiency of 4.02%. From the electrochemical impedance spectroscopic analysis, it was found that the resistance elements related to the Pt electrode and electrolyte interface behave like that of diode and the series resistance corresponds to the sum of the other resistance elements. Surface morphology and sheet resistance of Pt counter electrode did not degrade the performance of the cell. This novel 8V-0.33A DC power source shows stable performance with an energy conversion efficiency of 4.24% under 1 sun illumination (AM 1.5, Pin of $100\;mW/cm^2$).

A Shape Optimization of Universal Motor using FEM and Evolution Strategy

  • Shin, Pan-Seok
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.2B no.4
    • /
    • pp.156-161
    • /
    • 2002
  • This paper proposes an optimized universal motor for improving its performance using the finite element method (FEM) with the (1+1) Evolution Strategy (ES) algorithm. To do this, various design parameters are modified, such as air gap length, shape of motor slot, pole shoe, pole width, and rotor shaft diameter. Two parameters (arc length of stator pole and thickness of pole shoe) are chosen and optimized using the program, and the optimized model is built and tested with a performance measuring system. The measured values of the model are compared with those of the initial and the optimized model to prove the algorithm. As a result, the final model improves its performance compared with those of the initial model.

Design of Plasmonic Slot Waveguide with High Localization and Long Propagation Length

  • Lee, Ki-Sik;Jung, Jae-Hoon
    • Journal of the Optical Society of Korea
    • /
    • v.15 no.3
    • /
    • pp.305-309
    • /
    • 2011
  • We present an efficient design approach for a plasmonic slot waveguide using a genetic algorithm. The analyzed structure consists of a nanometric slot in a thin metallic film embedded within a dielectric. To achieve high confinement without long propagation length, the thickness and width of the slot are optimally designed in order to optimize the figures of merit including mode confinement and propagation length. The optimized design is based on the finite element method and enhances the guiding and focusing of light power propagation.

Crack-Healing Behavior of SiC with Additive SiO2 Colloid

  • Ahn, Seok-Hwan;Moon, Chang-Kwon;Nam, Ki-Woo
    • Journal of Power System Engineering
    • /
    • v.19 no.1
    • /
    • pp.45-49
    • /
    • 2015
  • This study focuses on the crack-healing behavior and bending strength of SiC ceramics with sintering additives of $SiO_2$colloid. Optimized crack-healing condition was found to be 1hr at an atmosphere of 1373 K. The maximum crack size that can be healed at the optimized condition was a semi-elliptical surface crack of $450{\mu}m$ in diameter. After heat treatment at the optimum temperature in air, the crack morphology almost entirely disappeared and the strength recovered to the value of the smooth specimens at room temperature for the investigated crack sizes up to $450{\mu}m$. The crack with width $1.4{\mu}m$ can be completely heal the surface crack.

Design Consideration of Bulk FinFETs with Locally-Separated-Channel Structures for Sub-50 nm DRAM Cell Transistors

  • Jung, Han-A-Reum;Park, Ki-Heung;Lee, Jong-Ho
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.8 no.2
    • /
    • pp.156-163
    • /
    • 2008
  • We proposed a new $p^+/n^+$ gate locally-separated-channel (LSC) bulk FinFET which has vertically formed oxide region in the center of fin body, and device characteristics were optimized and compared with that of normal channel (NC) FinFET. Key device characteristics were investigated by changing length of $n^+$ poly-Si gate ($L_s$), the material filling the trench, and the width and length of the trench at a given gate length ($L_g$). Using 3-dimensional simulations, we confirmed that short-channel effects were properly suppressed although the fin width was the same as that of NC device. The LSC device having the trench non-overlapped with the source/drain diffusion region showed excellent $I_{off}$ suitable for sub-50 nm DRAM cell transistors. Design of the LSC devices were performed to get reasonable $L_s/L_g$ and channel fin width ($W_{cfin}$) at given $L_gs$ of 30 nm, 40 nm, and 50 nm.

Determination of the dispersion profile of a dispersion decreasing fiber and the input pulse amplitude for efficient adiabatic pulse compression (효과적인 단열 펄스 압축을 위한 분산감소 광섬유의 분산 특성 및 입력 펄스 진폭 결정)

  • 최봉수;서동선
    • Journal of the Korean Institute of Telematics and Electronics D
    • /
    • v.34D no.3
    • /
    • pp.123-130
    • /
    • 1997
  • We determine the dispersion profile of a dispersion decreasing fiber(DDF) for optimum pulse compression from a trade-off between high pulse compression and low pedestal power/short DDF length. We find that the optimum vlaue of the exponential dispersion decreasing factor .alpha. is 0.95 and that the corresponding optimum fiber length is 1.5 times of the initial soliton period. Passing through the dDF, ~10 times of pulse comparession ratio can be achieved without significant increase in pedestal power. To compress relatively broad pulses using a given DDF optimized at a specific pulse width, we also detemrine the optimum input pulse amplitude, as a function of input pulse width.

  • PDF

The Design and Characteristics of Aperture Coupled Wideband Microstrip Antenna with the T-shaped Feedline (T-모양 급전선을 갖는 개구 결합 광대역 마이크로스트립 안테나의 설계 및 그 특성)

  • Jang, Yong-Ung
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.37 no.12
    • /
    • pp.32-37
    • /
    • 2000
  • We proposed to a new method of the aperture coupled microstrip antenna with T-shaped feeding slot. We analyzed method of enhancing the bandwidth of the antenna using FDTD. And the antenna parameters are optimized to get maximum bandwidth. We also calculated the progress process of waves and the distribution of electric field in the time domain. We also calculated return loss, VSWR, input impedance, radiation pattern in the frequency domain by Fourier transforming the time domain results, respectively. It was found that the bandwidth of this antenna changes length and width of the patch, length and width of the slot, length of T-shaped feedline, position of the offset. Measured % bandwidth was 49.2 % in the center frequency 2.5 GHz. These results were in relatively food accordance with calculated values.

  • PDF

Optimal Design of Arrayed Waveguide Grating

  • Jung, Jae-Hoon
    • Journal of the Optical Society of Korea
    • /
    • v.8 no.3
    • /
    • pp.99-103
    • /
    • 2004
  • This paper describes the optimal design of an AWG spectrum to meet various specifications and improve some physical parameters. The objective function is the norm of the difference between design parameters and target values. To obtain the design parameters, the Fourier model is employed and the design variables arc spacing of array waveguide, width of array waveguide, optical path difference, and focal length. The (1+1) Evolution Strategy is employed as the optimization tool. The optimization procedure is applied to a 16-channel AWG and the optimized design variables will considerably improve the system performance.

A Study on the Reduction of the Sloshing of Storage Tank Using Wing and Diaphragm Baffle (날개형 및 격막형 배플을 이용한 유체저장탱크 내부의 슬로싱 저감 연구)

  • Lee, Young-Shin;Kim, Hyun-Soo;Lee, Jae-Hyung;Kim, Young-Wann;Ko, Sung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.27 no.12
    • /
    • pp.2039-2046
    • /
    • 2003
  • Storage tank filled with fluid has unique dynamic characteristics compared to general structures, due to the interaction between fluid and structure. The oscillation of the fluid surface caused by external forces is called sloshing, which occurs in moving vehicles with contained liquid masses, such as trucks, railroad cars, aircrafts, and liquid missles. In this study, the evaluation method for the reduction of sloshing, the optimized size and location of wing and diaphragm baffles are suggested based on the experimental results. The experimental device can simulate the translation motion. A rectangular tank and various baffles are fabricated to study on the sloshing characteristics. The forces measured using the load cell at tank wall and those are compared with each other through the Fourier transformation for various conditions. The study of the sloshing of the rectangular tank equipped with baffles is conducted under the same conditions with non-baffled rectangular tank experiment. From the experimental results, the sloshing reduction effect by the baffles is observed. In conclusion in case of diaphragm baffles, the optimized size ratio of the width of baffle to the water height is 0.44 and the installation location has no effect to the damping of sloshing. In case of wing baffles, the optimized size ratio of the width of baffle to the length of a rectangular tank is 0.1 and the optimized location ratio of the baffle to the water height is 0.9.