• Title/Summary/Keyword: fast MoM

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Low-Complexity VFF-RLS Algorithm Using Normalization Technique (정규화 기법을 이용한 낮은 연산량의 가변 망각 인자 RLS 기법)

  • Lee, Seok-Jin;Lim, Jun-Seok;Sung, Koeng-Mo
    • The Journal of the Acoustical Society of Korea
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    • v.29 no.1
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    • pp.18-23
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    • 2010
  • The RLS (Recursive Least Squares) method is a broadly used adaptive algorithm for signal processing in electronic engineering. The RLS algorithm shows a good performance and a fast adaptation within a stationary environment, but it shows a Poor performance within a non-stationary environment because the method has a fixed forgetting factor. In order to enhance 'tracking' performances, BLS methods with an adaptive forgetting factor had been developed. This method shows a good tracking performance, however, it suffers from heavy computational loads. Therefore, we propose a modified AFF-RLS which has relatively low complexity m this paper.

Development of Nondestructive Sorting Method for Brown Bloody Eggs Using VIS/NIR Spectroscopy (가시광 및 근적외선 전투과 스펙트럼을 이용한 갈색 혈란 비파괴선별 방법 개발)

  • Lee, Hong-Seock;Kim, Dae-Yong;Kandpal, Lalit Mohan;Lee, Sang-Dae;Mo, Changyeun;Hong, Soon-Jung;Cho, Byoung-Kwan
    • Journal of the Korean Society for Nondestructive Testing
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    • v.34 no.1
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    • pp.31-37
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    • 2014
  • The aim of this study was the non-destructive evaluation of bloody eggs using VIS/NIR spectroscopy. The bloody egg samples used to develop the sorting mode were produced by injecting chicken blood into the edges of egg yolks. Blood amounts of 0.1, 0.7, 0.04, and 0.01 mL were used for the bloody egg samples. The wavelength range for the VIS/NIR spectroscopy was 471 to 1154 nm, and the spectral resolution was 1.5nm. For the measurement system, the position of the light source was set to $30^{\circ}$, and the distance between the light source and samples was set to 100 mm. The minimum exposure time of the light source was set to 30 ms to ensure the fast sorting of bloody eggs and prevent heating damage of the egg samples. Partial least squares-discriminant analysis (PLS-DA) was used for the spectral data obtained from VIS/NIR spectroscopy. The classification accuracies of the sorting models developed with blood samples of 0.1, 0.07, 0.04, and 0.01 mL were 97.9%, 98.9%, 94.8%, and 86.45%, respectively. In this study, a novel nondestructive sorting technique was developed to detect bloody brown eggs using spectral data obtained from VIS/NIR spectroscopy.

Determination of Mefenamic Acid with Fe(II)-Dipyridyl-Mefenamic Acid Ternary Complex as Ion-exchagner (철-디피리딜-메페남산 삼원착물을 이용한 메페남산의 정량)

  • Nam, Su Ja;Moon, Hyun Sook;Lee, Mi Na;Jung, Moon Mo;Hur, Moon Hye;Ahn, Moon Kyu
    • Analytical Science and Technology
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    • v.14 no.1
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    • pp.59-63
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    • 2001
  • A PVC membrane electrodes based on Fe(II)-dipyridyl-mefenamic acid ternary complex as ion exchanger were prepared using o-nitrophenyl octyl ether as a plasticizer. The 2,2'-dipyridyl, 4,4'-dipyridyl and 4,4'-dipyridyl-2,2'-dipyridyl were used as dipyridyl derivative ligand. The electrode dxhibits a fast stable and linear response for $10^{-5}-10^{-3}mol/L$ mefenamate with an anionic slope of -55.98, -49.47, -59.35mV/decade in pH 8.9 borate buffer solution respectively. Potentiometric selectivity measurements revealed negligible interferences from aromatic and aliphatic carboxylic acid salts.

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A Materials Approach to Resistive Switching Memory Oxides

  • Hasan, M.;Dong, R.;Lee, D.S.;Seong, D.J.;Choi, H.J.;Pyun, M.B.;Hwang, H.
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.8 no.1
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    • pp.66-79
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    • 2008
  • Several oxides have recently been reported to have resistance-switching characteristics for nonvolatile memory (NVM) applications. Both binary and ternary oxides demonstrated great potential as resistive-switching memory elements. However, the switching mechanisms have not yet been clearly understood, and the uniformity and reproducibility of devices have not been sufficient for gigabit-NVM applications. The primary requirements for oxides in memory applications are scalability, fast switching speed, good memory retention, a reasonable resistive window, and constant working voltage. In this paper, we discuss several materials that are resistive-switching elements and also focus on their switching mechanisms. We evaluated non-stoichiometric polycrystalline oxides ($Nb_2O_5$, and $ZrO_x$) and subsequently the resistive switching of $Cu_xO$ and heavily Cu-doped $MoO_x$ film for their compatibility with modem transistor-process cycles. Single-crystalline Nb-doped $SrTiO_3$ (NbSTO) was also investigated, and we found a Pt/single-crystal NbSTO Schottky junction had excellent memory characteristics. Epitaxial NbSTO film was grown on an Si substrate using conducting TiN as a buffer layer to introduce single-crystal NbSTO into the CMOS process and preserve its excellent electrical characteristics.

Evaluation of Consistency on Kinematic Factors in Women Javelin Throw (여자 창던지기 운동학적 요인의 일관성 평가)

  • Hong, Soon-Mo;Lee, Young-Sun
    • Korean Journal of Applied Biomechanics
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    • v.17 no.4
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    • pp.65-71
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    • 2007
  • The purpose of this study was to investigate variability of kinematic factors affecting the record in women's javelin throwing. For this study, 8 female-javelin thrower participated in this experiment. The three digital video cameras (Sony, 120x) were used to record motions. Kwon3D 2.1 was used to process data and they were analyzed with Excell for factors. The sampling rate of a camera was 60Hz and shutter speed of a camera was 1/1000sec. The coordinate data were filtered using a fourth-order Butterworth low pass filtering with an estimated optimum cut-off frequency of 6Hz. The results were as follows: 1. From cross step to landing of delivery, the average velocities of CoM of non-dominant athletes were greater than dominant athletes and those of CoM of non-dominant athletes less than dominant athletes, but at release dominant athletes had a lower average velocity and a variability than non-dominant athletes. 2. From cross step to landing of delivery, the average throwing velocities and variabilities of a javelin of dominant athletes were greater than dominant athletes, but at release, dominant athletes had a higher velocity than dominant athletes and had a equal variability. 3. At every events, a forward or backward angles and variabilities of non-dominant athletes were greater than dominant athletes. 4. From cross step to landing of delivery, dominant athletes' elbow average angles were greater than non-dominant athletes and the variabilities of latter less than non-dominant athletes, but at release dominant athletes' variabilities were smaller than non-dominant athletes. 5. At landing of delivery, dominant athletes' knee average angles and variabilities of a supporting foot were a greater than non-dominant athletes, and at release, dominant athletes' knee average angles was a greater but variabilities less than non-dominant athletes. In conclusion, the dominant threw javelins fast while having stable postures and the range of elbow's angle large.

A Fast Computation Method of Far Field Interactions in CBFM for Electromagnetic Analysis of Large Structures (임의 대형구조 전자기 해석을 위한 CBFM의 빠른 원거리 상호 작용 계산 알고리즘)

  • Park, Chan-Sun;Hong, Ic-Pyo;Kwon, Obum;Kim, Yoon-Jae;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.9
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    • pp.701-706
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    • 2018
  • The characteristic basis function method, or CFBM, is one of the representative electromagnetic methods widely used today. In this paper, we propose an accelerating algorithm for the far field interaction calculation of CBFM, to efficiently analyze the electromagnetic characteristics of arbitrarily large structures. To effectively analyze the electromagnetic characteristics of a large structure, it is essential to shorten the computation time. In the CBFM analysis method, the complexity can be greatly reduced by using approximations created via the multipole expansion method. The new algorithm proposed in this paper is applied to the computation of radar cross sections of conductor spheres and fighter aircraft, and it is confirmed that calculation time is reduced by 34 % and 74 %, respectively, without loss of accuracy compared with existing CBFM.

Cr Electroplating Technology to prevent Interdiffusion between Metallic Fuel and Clad Material (금속연료-피복재 상호확산 방지를 위한 크롬 도금법 적용 연구)

  • Kim, Jun Hwan;Lee, Kang Soo;Yang, Seong Woo;Lee, Byoung Oon;Lee, Chan Bock
    • Korean Journal of Metals and Materials
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    • v.49 no.12
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    • pp.937-944
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    • 2011
  • Studies have been carried out in order to reduce fuel-cladding chemical interaction (FCCI) behavior of metallic fuel in sodium-cooled fast reactors (SFR) using an electroplating technique. A $20{\mu}m$ thick Cr layer has been plated by the electrochemical method in the Sargent bath over the HT9 (12Cr-1Mo) clad material and diffusion couple tests of the U-10Zr metallic fuel as well as the rare earth alloy (70Ce-29La) have been conducted. The results show that the Cr plating can prevent FCCI behavior along the fuel-clad interface. However, cracks developed through the thickness during plating, which resulted in the migration of some fuel constituents. Variation of bath temperature, application of pulse current, and post heat treatment have been conducted to control such cracks. We found out that some conditions like the pulse current and the post heat treatment enhanced the layer property by reducing the internal cracks and improving the diffusion couple test.

One-step Separation of 30K Protein from the Silkworm Hemolymph by Anion-exchange Chromatography and Its Effect on the Proliferation of Human Cells (음이온교환 크로마토그래피를 이용한 누에체액 유래 30K 단백질의 정제와 정제된 단백질이 인간세포 배양 증식에 미치는 영향)

  • Shin Hyun-Chong;Joung Chan-Hi;Choi Yong-Soo;Lim Sang-Min;Han Kyuboem;Koo Yoon-Mo;Park Tai Hyun;Kim Dong-Il
    • KSBB Journal
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    • v.20 no.3
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    • pp.233-237
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    • 2005
  • In order to investigate the feasibility of 30K protein from silkworm (Bombyx mori) hemolymph (SH) on the proliferation of human cells, a simple separating procedure by anion-exchange chromatography system with Q-Sepharose fast flow gel was established. The 30K protein was eluted with an optimized condition of 0.16 M sodium chloride in 20 mM tris buffer (pH 9.0). The separated 30K protein at three concentrations of 0.04, 0.12, and 0.4 mg/ml was added to the culture medium with various human cells, such as chondrocytes, periosteum-derived cells, and MRC-5 cells, and their growth rates were measured. The cell growth rate at protein concentration of 0.4 mg/ml was always higher than that without 30K protein in all human cells tested, suggesting that the 30K protein has positive effect on the increase of the life span of human cells.

CFD Analysis for Microclimate of Venlo Type Glasshouse with the Screen Height and Air-inflow Quantity (스크린설치높이·공기유입량 차이에 따른 벤로형 유리온실 미기상 CFD 유동해석)

  • Yang, Won Mo
    • Journal of Bio-Environment Control
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    • v.29 no.1
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    • pp.52-61
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    • 2020
  • The natural change of winter night temperature from 00:00 to 04:30 O'clock with the different height of thermal screen in a venlo type glasshouse (W59×L68×H5.9 m) was studied using computational fluid dynamics (CFD). At the early stage of CFD analysis, the room temperature decrease of glasshouse with the 5.9 m height of thermal screen were faster than it with the 4.1m height of thermal screen, but at 2 hr after analysis it was slower than in it with the 4,1m, the temperature difference was 0.6℃ after 4 hr. If we consider that turn on the heater when the temperature were decrease below 13℃ at 1hr after CFD analysis, it is good for energy saving in the glasshouse with the 4.1 m height of thermal screen rather than in it with the 5.9 m height, because of the temperature decrease were slow during 2 hrs after analysis. The airflow at the height of 2 m which were grown tomato were fast and wide in the glasshouse with the 5.9 m height thermal screen rather than in it with the 4.1 m, the speed difference was 0.034m·s-1 at 1hr after CFD analysis. The effect of temperature decrease in summer season were compared with the different height of shading screen from 12:00 to 14:30 O'clock. The height of shading screen were 5.7, 3.9 m, the gap of it were 30%. The air-inflow quantity by the fan with duct at lower part of venlo glasshouse was 0.67 ㎥·s-1 until 1hr and to increase 3 times of it from 1hr after analysis. The roof window were open 100%. Until 1hr of CFD analysis, the temperature in the 30% open of shading screen was 0.9℃ higher than in the none shading screen. From 13:00 O'clock when the air-inlet quantity to increase 3 times, the temperature in case 30% gap of shading screen were decreased compare with the none shading screen, the temperature difference was 0.5℃ at 14:30 O'clock. The temperature on the floor surface in case 30% gap of shading screen were lower with it's height increase, the temperature difference was 8℃ compare with none shading screen. The relative humidity difference were insignificant by the height and gap of shading screen.

Current Status and Future Prospects of Korean VLBI Network (KVN)

  • Jung, Taehyun;Sohn, Bong Won;So, Byunghwa;Oh, Chungsik;Je, Do-Heung;Byun, Do-Young;Jung, Dong-Kyu;Roh, Duk Gyoo;Lee, Euikyum;Kim, Hyo Ryoung;Kim, Hyun-Goo;Byun, Hyungkyu;Chung, Hyunsoo;Yim, In Sung;Kim, Jae-Young;Kim, Jaeheon;Yeom, Jaehwan;Shin, Jaesik;Park, Jeong-Je;Kim, Jeong-Sook;Hwang, Jungwook;Wajima, Kiyoaki;Song, Min-Gyu;Chung, Moon-Hee;Sakai, Nobuyuki;Lee, Sang-Hyun;Lee, Sang-Sung;Oh, Sej-Jin;Wi, Seog Oh;Kim, Seungrae;Kim, Soon-Wook;Lee, Sung-Mo;Kang, Yong-Woo;Minh, Young Chol;Kim, Young-Sik;Yun, Youngjoo
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.1
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    • pp.60.3-61
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    • 2021
  • The Korean VLBI Network (KVN) consists of three 21m radio telescopes installed in Seoul, Ulsan, and Jeju Island with the world's first 4-channel receiver that can observe four different frequencies (e.g., 22, 43, 86, 129 GHz) simultaneously. This receiving system of KVN is particularly effective in millimeter-wavelength VLBI (mm-VLBI) observations by compensating fast atmospheric fluctuations effectively. This technology is now being enhanced with a compact triple-band receiver, becoming the world standard for a mm-VLBI system. In 2020, KVN supported 54 observing programs (KVN: 28, EAVN: 26) including the 2nd KVN Key Science Program (KSP) which supports 8Gbps data recording rate and the East Asian VLBI Network (EAVN) programs. KVN also participated in the European VLBI Network (EVN) and GMVA (Global Millimeter VLBI Array) sessions regularly. Here, we report current status and future propsects of KVN.

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