• 제목/요약/키워드: Energy Converting

검색결과 274건 처리시간 0.03초

압전빔의 진동을 이용한 마이크로 동력원의 에너지 변환 해석 (Analysis of Energy Conversion Efficiency in Micro Power Generation using Vibrating Piezoelectric Cantilever)

  • 이헌주;장영수;이윤표
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.3365-3370
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    • 2007
  • We developed micro power generation system using piezoelectric materials. In our system, the ambient vibrating energy is converting to electric energy by deflection of piezoelectric beams. The system consists of energy generating parts, converting enhancement parts, electric regulation and charging parts, and interface with small-energy-consuming mobile devices. The geometry of piezoelectric beams, the source of vibrating energy, and the electric load of target application determine the characteristics of generating electric power, such as impedance, voltage, current and power density. Therefore, we made a model for analysis of generating power with given information such as piezoelectric materials, geometry, vibration type, and mass. With this model, we can calculate capacitance of piezoelectric beams, generating voltage, current, and power. To obtain maximum energy transfer efficiency, we approached this study in the view of material, electrical, and mechanical engineering

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압전재료가 부착된 동적 구조물로부터 발생되는 전기력의 해석적인 평가 (Analytical Estimation of Power Generation from Dynamic Structure With Piezoelectric Element)

  • 오재응;윤지현;심현진;이유엽
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 춘계학술대회논문집
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    • pp.263-263
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    • 2007
  • In the future, self-contained sensors and processing units will need on-board, renewable power supplies to be truly autonomous. One way of supplying such power is through energy harvesting, processes by which ambient forms of energy are converted into electricity. One energy harvesting technique involves converting kinetic energy, in the form of vibrations, into electrical energy through the use of piezoelectric materials. Researchers are currently investigating how piezoelectric materials can be used to harvest power. This study examines the use of auxiliary structures, consisting of a mechanical fixture and a lead zirconate/lead titanate (PZT) piezoelectric element, which can be attached to any boundary conditions vibrating beam of the any boundary conditions. Adjusting various boundary conditions of these structures can maximize the strain induced in the attached PZT element and improve power output.

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영구자석 자기력의 기계적 에너지 이용에 관한 유용성 고찰 (Proposal for the New Regeneration Energy Made by Converting Magnetic Force into Mechanical Energy)

  • 신현준;김정엽;박병직;이수각
    • 설비공학논문집
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    • 제28권4호
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    • pp.158-164
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    • 2016
  • Currently, identifying a new carbon-free energy resource is important in order to resolve the global warming problem. Along the same line, this paper studied how to convert magnetic force into mechanical force and a new basic mechanism of converting magnetic force into mechanical force was identified. Long-term reliability test, around 15 million times, was also conducted at $-1^{\circ}C{\sim}27^{\circ}C$ to evaluate the durability of magnetic force. As a result, tests showed that the deviation of the mechanical force was within 0.8% of the initial force, and the relation between repulsive force (P) and ambient temperature (T) was formulated in a linear equation P = -0.175T+78.945.

광파장분석기 설계 및 구현 (Design and Implementation of an optical wavelength analyzer)

  • 박성훈;박종원;이남호
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2012년도 춘계학술대회
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    • pp.571-574
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    • 2012
  • 본 연구는 광파장분석기 설계 및 구현에 관한 것이다. 실험을 위해 입력광은 적외선, 자외선, 가시광선으로 광원을 사용하였다. 전류전압(I-V) 변환회로는 포토다이오드[1]로 구성 되어 있다. 광기전력을 이용하여 전압을 측정한다. 측정한 전압의 크기로 광원의 파장을 알아낼 수 있다.

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녹색도로의 열 에너지 하베스팅을 위한 시스템 개발에 관한 연구 (A Study on the Development of Green Road System for Heat Energy Harvesting)

  • 조병완;이덕희;이동윤;이창섭
    • 한국도로학회논문집
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    • 제13권1호
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    • pp.87-96
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    • 2011
  • 대량의 화석연료 소비로 인한 지구 생태계의 부작용에 따라 전 세계적으로 저탄소와 지속가능한 신재생에너지의 활용이 요구되고 있다. 본 논문에서는 여름철 아스팔트 포장도로에서 발생하는 열에너지를 열전현상을 이용하여 전기에너지로 변환하여 에너지 위기를 새로운 성장의 기회로 전환하려 하였다. 이를 위해 열발전소자의 전기적 특성실험과 아스팔트 포장도로 시험체에 열발전소자 매입 및 열 회수 파이프 매입 실험을 통해 에너지 하베스팅 전력을 측정하여 가장 효과적인 아스팔트 포장도로의 열에너지 하베스팅을 위한 시스템 구축방안을 검토하였으며, 결국 아스팔트 포장도로에서 발생하는 지속가능한 열 에너지원을 활용함과 동시에 환경보존과 경제성장을 도모할 수 있는 신개념의 녹색도로 사회기반시설을 제안하였다.

자립형 태양광 발전 시스템을 위한 3상 양방향 DC-AC 인버터 연구 (The Study of 3-Phase Bi-Directional DC to AC Inverter for the Bi-Model PV PCS)

  • 양승대;정승환;최주엽;최익;이영권
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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    • pp.319-324
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    • 2012
  • This paper presents the study of 3-Phase bi-directional DC to AC inverter with unity power factor. 3-Phase bi-directional DC to AC inverter is important for the bi-modal PV PCS with an energy storage system. Both Inverting and converting are needed to connect between the grid side and boost converting side to charge and discharge the energy storage system. The paper proposes the appropriate circuit topology and proper control system for the bi-directional inverter. It also proposes the method of selecting the optimum control method considering system stability. PSIM simulation is used to validate the proposed algorithm.

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확률기반 배경제거 기법의 향상을 위한 밝기 사영 및 변환에너지 기반 그림자 영역 제거 방법 (A Shadow Region Suppression Method using Intensity Projection and Converting Energy to Improve the Performance of Probabilistic Background Subtraction)

  • 황숭민;강동중
    • 제어로봇시스템학회논문지
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    • 제16권1호
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    • pp.69-76
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    • 2010
  • The segmentation of moving object in video sequence is a core technique of intelligent image processing system such as video surveillance, traffic monitoring and human tracking. A typical method to segment a moving region from the background is the background subtraction. The steps of background subtraction involve calculating a reference image, subtracting new frame from reference image and then thresholding the subtracted result. One of famous background modeling is Gaussian mixture model (GMM). Even though the method is known efficient and exact, GMM suffers from a problem that includes false pixels in ROI (region of interest), specifically shadow pixels. These false pixels cause fail of the post-processing tasks such as tracking and object recognition. This paper presents a method for removing false pixels included in ROT. First, we subdivide a ROI by using shape characteristics of detected objects. Then, a method is proposed to classify pixels from using histogram characteristic and comparing difference of energy that converts the color value of pixel into grayscale value, in order to estimate whether the pixels belong to moving object area or shadow area. The method is applied to real video sequence and the performance is verified.

Assessment of the potential for the design of marine renewable energy systems

  • Duthoit, Maxime;Falzarano, Jeffrey
    • Ocean Systems Engineering
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    • 제8권2호
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    • pp.119-166
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    • 2018
  • The assessment of the potential for the design of marine renewable energy systems is reviewed and the current situation for marine renewable energy is promising. The most studied forms of marine renewable energy are ocean wind energy, ocean wave energy and tidal energy. Wind turbine generators include mostly horizontal axis type and vertical axis type. But also more exotic ideas such as a kite design. Wave energy devices consist of designs converting wave oscillations in electric power via a power take off equipment. Such equipment can take multiple forms to be more efficient. Nevertheless, the technology alone cannot be the only step towards marine renewable energy. Many other steps must be overcome: policy, environment, manpower as well as consumption habits. After reviewing the current conditions of marine renewable energy development, the authors analyzed the key factors for developing a strong marine renewable energy industry and pointed out the huge potential of marine renewable energy.

3D-QSAR of Angiotensin-Converting Enzyme Inhibitors: Functional Group Interaction Energy Descriptors for Quantitative Structure-Activity Relationships Study of ACE Inhibitors

  • Kim, Sang-Uk;Chi, Myung-Whan;Yoon, Chang-No;Sung, Ha-Chin
    • BMB Reports
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    • 제31권5호
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    • pp.459-467
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    • 1998
  • A new set of functional group interaction energy descriptors relevant to the ACE (Angiotensin-Converting Enzyme) inhibitory peptide, QSAR (Quantitative Structure Activity Relationships), is presented. The functional group interaction energies approximate the charged interactions and distances between functional groups in molecules. The effective energies of the computationally derived geometries are useful parameters for deriving 3D-QSAR models, especially in the absence of experimentally known active site conformation. ACE is a regulatory zinc protease in the renin-angiotensin system. Therapeutic inhibition of this enzyme has proven to be a very effective treatment for the management of hypertension. The non bond interaction energy values among functional groups of six-feature of ACE inhibitory peptides were used as descriptor terms and analyzed for multivariate correlation with ACE inhibition activity. The functional group interaction energy descriptors used in the regression analysis were obtained by a series of inhibitor structures derived from molecular mechanics and semi-empirical calculations. The descriptors calculated using electrostatic and steric fields from the precisely defined functional group were sufficient to explain the biological activity of inhibitor. Application of the descriptors to the inhibition of ACE indicates that the derived QSAR has good predicting ability and provides insight into the mechanism of enzyme inhibition. The method, functional group interaction energy analysis, is expected to be applicable to predict enzyme inhibitory activity of the rationally designed inhibitors.

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실측자료에 근거한 동해안 파력 부존량 검토 (Investigation on the Wave Power Resources on the East Coast of Korea Based on Field Measurement Data)

  • 정원무;오상호;이달수;이동영
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 춘계학술대회
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    • pp.630-634
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    • 2007
  • In the past, the use of wave energy has mainly been focused on conversion of large wave energy resources in the far offshore areas. However, with the technological improvement of converting wave energy into electricity, the energy resources at much shallow waters are now considered as a site for possible installation of the devices that obtain energy from the waves. In this respect, the wave energy resources on the east coast of Korea, where the sea is milder than the open ocean, were investigated using the field measurement data obtained at three different locations along the coast. For all the locations, the wave power was greater in winter season, compared to summer season. The estimated wave power varied from 2 to 4.5 kW/m on average, depending on the measurement locations.

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