• Title, Summary, Keyword: FIR

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Wood Anatomy and Identification of North American Firs (Abies)

  • Eom, Young-Geun;Kwon, Oh-Kyung
    • Journal of the Korean Wood Science and Technology
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    • v.37 no.5
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    • pp.451-458
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    • 2009
  • Anatomical comparison of 8 North American species of Abies was executed to provide taxonomic information. The species of eastern (balsam and Fraser fir) and western (Pacific silver, white, grand, subalpine, California red, and noble fir) were found to be separated on the basis of crystals and color of contents in ray parenchyma cells and ray height. In eastern species, crystals in ray parenchyma cells were absent and ray parenchyma cell contents were colorless to very light. These two eastern species were further characterized by the absence of uniseriate rays exceeding 25 cells in height. In western species, only subalpine fir had colorless to very light contents but the remaining five species have dark contents in ray parenchyma cells. Crystals were absent to extremely sparse in Pacific silver fir, somewhat frequent in noble fir, frequent in grand and California red fir, and very frequent in white fir. Uniseriate rays exceeding 25 cells in height were regularly found in grand and California red fir but absent in white and noble fir.

Design of GHz Analog FIR Filter based on a Distributed Amplifier (분산증폭기 기반 GHz 대역 아날로그 FIR 필터 설계)

  • Yeo, Hyeop-Goo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.8
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    • pp.1753-1758
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    • 2012
  • This paper introduces analog FIR filters based on a distributed amplifier and analyzes the proposed filter's characteristics. A simple design method of an analog FIR filter based on the digital filter design technique is also introduced. The proposed analog FIR filters are a moving average(MA) and a comb type filters with no multiplier. This simple structures of the proposed filters may enable to operate at multi-GHz frequency range and applicable to combine a filter and an amplifier of RF system. The proposed analog FIR filters were implemented with standard $0.18{\mu}m$ CMOS technology. The designed GHz analog FIR filters are simulated by Cadence Spectre and compared to the results of digital FIR filters obtained from MATLAB simulations. From the simulation results, the characteristics of the proposed analog FIR filters are fairly well matched with those of digital FIR filters.

The Characteristics os Water Quality of Tap water and Far-infrared rays mineral water (수돗물과 원적외선 기능수의 수질 특성의 비교)

  • 백우현
    • Journal of Environmental Science International
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    • v.9 no.5
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    • pp.423-428
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    • 2000
  • The characteristics of Far-infrared rays mineral water(FIR water) have been compared to the tap water by means of relationship between FIR water and Nuclear Magnetic Resonance spectroscopy(NMR), FIR water and thermography FIR water and velocity of blood FIR-water and pH, FIR water and dissolved oxygen(DO), FIR water and Oxidation-Reduction Potential(ORP) using the development FIR water purification of grand prix system. From the experimental result are quite satisfactory when compared with the tap water. Also the FIR water were evaluated to see if those are tasty and healthy using the Hashimoto's Mineral Balance Index. As a result FIR-water was found as tasty and healthy.

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Unified FIR filter using delta operator (델타 연산자를 이용한 통합형 FIR 필터)

  • 서민상;권오규
    • 제어로봇시스템학회:학술대회논문집
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    • pp.912-916
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    • 1992
  • In this paper we investigate the connection between the continuous-time FIR(finite impulse response) filter and the corresponding discrtet-time FIR filter with fast sampling. The interconnection is established by formulating the discrete-time case using delta operators which has superior numerical properties in discretizing prcedure. The aim of this paper is to present a unified FIR filter using the .delta.-operator and to show that, as sampling interval .DELYA. aperator to zero, the results of this filter converge to the corresponding continuous-time reuslts, which implies that the unified FIR filter unifies continous-time FIR filter and discrtet-time FIR filter.

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Reconfigurable FIR Filter Design Using Partial Reconfiguration (부분 재구성 방법을 이용한 재구성형 FIR 필터 설계)

  • Choi, Chang-Seok;Lee, Han-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.4
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    • pp.97-102
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    • 2007
  • This paper presents our implemented, synthesized and tested on demand and partial reconfiguration approaches for FIR filters using Xilinx Virtex FPGAs. Our scope is implementation of a low-power, area-efficient autonomously reconfigurable digital signal processing architecture that is tailored for the realization of arbitrary response FIR filters on Xilinx Virtex4 FPGAs. The implementation of design addresses area efficiency and flexibility allowing dynamically inserting and/or removing the partial modules to implement the partial reconfigurable FIR filters with various taps. This partial reconfigurable FIR filter design shows the configuration time improvement, good area efficiency and flexibility by using the dynamic partial reconfiguration method.

Design of 5GHz FIR filter LNA based on a Distribute Amplifier (분산증폭기 기반 5GHz FIR 필터 LNA 설계)

  • Yeo, Hyeopgoo;Jung, Seung-Min
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.842-844
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    • 2012
  • This paper introduces a 5GHz FIR filter low noise amplifier (LNA) based on a distributed amplifier and analyzes the its characteristics. The proposed FIR filter-LNA has the MA(moving average) filter characteristic which improves the frequency selectivity of the amplifier. Proto-type circuits with FR4 and ${\varepsilon}_r=10.2$ PCB have been realized and simulated using ADS (Advanced Design System). The simulation results verified that the designed LNA had a gain of about 10dB and the frequency characteristic of the MA FIR filter. It is expected that the proposed FIR filter LNA can be applicable to the various applications using an amplifier and a filter in RF systems.

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Water and Methanol Maser Observations toward NGC 2024 FIR 6 with KVN

  • Choi, Minho;Kang, Miju;Byun, Do-Young;Lee, Jeong-Eun
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.2
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    • pp.103.2-103.2
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    • 2012
  • NGC 2024 FIR 6 is a star formation site in Orion and may contain a hypercompact H II region, FIR 6c, and a low-mass protostar, FIR 6n. The FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz, using KVN in the single-dish telescope mode. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n while one component was associated with FIR 4, another young stellar object in the 22 GHz beam. A typical life time of the water-maser velocity-components is about 8 months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km/s/day. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers did not show a detectable time-variability. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n.

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Design of Variable Cutoff Frequency Two-Dimensinal FIR Filters (가변차단 주파수 2차원FIR필터의 설계)

  • Sang-Uk Lee
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.32 no.12
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    • pp.427-434
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    • 1983
  • Singular Value Decomposition of 2-D Finite Impulse Response was used to design a variable cutoff 2-D FIR filters. Basically this approach allows to use 1-D techniques while dealing with 2-D filters. In this paper, our aim is to provide away of easily tuning 2-D FIR filters. For example, one would like to adjust interactively the cutoff frequency of a 2-D Circular Symmetric low-pass filter on an image processing system. The decomposition of 2-D FIR filters along with techniques available for tuning 1-D FIR filters allows such adjustment. Several design examples are shown.

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Design of FIR-Rake Receiver for TD-SCDMA Mobile Stations (TD-SCDMA 이동국용 FIR-Rake 수신기 설계)

  • Lee, Kwang-Jae;Xiao, Yang;Lee, Moon-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.1
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    • pp.123-131
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    • 2007
  • This paper developed a FIR-Rake receiver which makes use of a pilot signal broadcast by the TD-SCDMA (division-synchronous code division multiple access) base station to estimate the channel parameters. The FIR-Rake receiver can reduce multipath interference for the mobile stations. The analysis in frequency and discrete domain and computer simulations confirm that the proposed FIR-Rake receiver achieves a better performance under typical multipath fading propagation conditions.