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Al-Mamun, M.,Ito, C.,Fujita, T.,Sano, H.,Sato, A. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.10
The [$^2H_5$]phenylalanine model was compared with the [1-$^{13}C$]leucine method to determine whole body protein synthesis (WBPS) and degradation (WBPD) in sheep fed at two levels. The animals were fed either 103 (M-diet) or 151 (H-diet) kcal $ME/kg^{0.75}/day$ once daily in a crossover design for 21 days each. The isotope dilutions were simultaneously conducted as a primed-continuous infusion of [$^2H_5$]phenylalanine, [$^2H_2$]tyrosine and [1-$^{13}C$]leucine on each dietary treatment. The WBPS and WBPD calculated from the [$^2H_5$]phenylalanine model were lower (p = 0.009 and p = 0.003, respectively) than those calculated from the [1-$^{13}C$]leucine method. The WBPS tended to be higher (p = 0.08) and WBPD was numerically higher (p = 0.33) for H-diet than M-diet in the [$^2H_5$]phenylalanine model, whereas the WBPS was numerically higher (p = 0.37) for H-diet and WBPS remained similar (p = 0.79) between diets in the [1-$^{13}C$]leucine method. However, the absolute values and the directions of WBPS as well as WBPD from M-diet to H-diet were comparable between the [$^2H_5$]phenylalanine model and [1-$^{13}C$]leucine method. Moreover, the values vary depending on the use of the respective amino acid contents in the carcass protein when calculating WBPS and WBPD. Therefore, it is concluded that the [$^2H_5$]phenylalanine model could be used as an alternative to the [1-$^{13}C$]leucine method for the determination of WBPS and WBPD in sheep.
Using EOG Signal to Control Robot Manipulator
M.I. Rusydi,Y. Mori,T. Okamoto,M. Sasaki,S. Ito 한국재활복지공학회 2012 한국재활복지공학회 학술대회논문집 Vol.2012 No.11
Electro-oculograph (EOG) is one of the biosignal that can be used to improve life quality in human machine interface area. EOG occurs as the eye activities change the magnitude of potential between cornea and retina. This signal was used to control robot manipulator in four directions (up, down, left and right). To record this phenomenon we used NF Instrument with head box to amplify the signal and processor box to process digital filter. Combination of 3 digital filter, 1.6 High Pass Filter, 60 Hz Low Pass Filter and 60 Hz Ham Filter added by 6 Hz Low Pass Filter gave neat signal until the difference among the eye movement could be distinguished. This is a real time system because we could detect when a signal comes and send it to the robot manipulator system through Arduino microcontroller. The determination of the signal emersion was successfully calculated by the combination of wavelet transform with scale = 1 and translation = 0.031 and garbor filter with O=1. Since the average accuracy of the system is more than 90% so we can use this method for some extend application later.
Timing Performance Study of New Fast PMTs With LYSO for Time-of-Flight PET
Ito, M.,Jin Pyo Lee,Jae Sung Lee IEEE 2013 IEEE transactions on nuclear science Vol.60 No.1
<P>Most efforts at developing time-of-flight (TOF) positron emission tomography (PET) instruments have focused on improving their time resolution, which is affected by many factors. The aim of this study was to evaluate the performance of two new fast photomultiplier tubes (PMT) (Hamamatsu R9800 and R11194) for use as a TOF-PET detector, and to investigate the correlation of time resolution with time discrimination methods, the properties of the PMTs, the locations of the scintillation crystal on the PMT, and the size of the scintillation crystal. The PMTs evaluated in this study have fast rise time and short time jitter. The performance evaluation of the PMTs was conducted using a LYSO scintillation crystal. A <SUP>22</SUP>Na source was placed between the testing detector and a reference detector (with a time resolution of 200 ps), and data were acquired by using the coincidence trigger of the two detectors. To determine the optimal time discrimination method, time resolutions were obtained using a leading-edge discriminator (LED) with various thresholds and a constant-fraction discriminator (CFD) with various CFD delays. The effects on time resolution of PMT properties, the crystal position on the PMT, and the size of the crystal were observed. Based on the comparison of time resolutions obtained by various time discrimination setups, the optimal setup was determined to be CFD with 1.0 ns CFD delay. When these PMTs were coupled with 4 mm × 4 mm ×10 mm LYSO crystal and CFD with 1.0 ns delay was used for time discrimination, the average time resolution (FWHM) for 7 R9800 was 200.5 ps and for 7 R11194 was 227.8 ps. The average energy resolutions were 11.1% and 11.8%, respectively. Time resolutions at the edge of the PMT were degraded due to light collection loss and worse transit time jitter. Time resolutions were inversely proportional to the square root of the numbers of photoelectrons per pulse. The numbers of photoelectrons increased proportionately with the blue sensitivity of individual PMTs. Time resolutions have a distinct dependence as a function of the length and cross-section of the crystal. The new fast PMT coupled with LYSO crystals allow for the improvement of timing performance in TOF-PET detectors. The results of this study will be of value as a guideline for optimizing the TOF-PET detector design using the fast PMTs.</P>
M. I Rusydi,T. Okamoto,M. Sasaki,S. Ito 한국재활복지공학회 2012 한국재활복지공학회 학술대회논문집 Vol.2012 No.11
Electro-oculogram (EOG) is such kind of sensitive biosignal that comes from eyes activities. Using the NF Instrument as the sensor to obtain the signal from gaze motion, the optimum electrode positions in order to distinguish the distance of vertical and horizontal movement were observed based on the magnitude and the stability of EOG signal. There were twelve electrode positions, each six beside and below the eye, as the candidate for the suitable electrode position to acquire the EOG. Another experiment to compare the signal difference between left and right eye was also investigated in horizontal and vertical eye movement. The result shows that the position number 2 satisfies the desired condition for horizontal movement and position number 11 leads in magnitude and stability of the EOG signal in vertical movement. Position number 10 is available for vertical and horizontal gaze motion for the alternative option. These positions were tested by finding the relationship between displacement (pixel) and EOG signal(μV). The result shows that linear approaching to this condition successfully detect the system not only in horizontal or vertical case but also in diagonal gaze motion with average error pixel around 80 pixels or 1.6 cm. Based on this result, we concluded that although we can get easily the EOG signal around the eyes, but not all positions can give a clear figure, so it is very important to determine the suitable electrode position