Kai - Ti Hsu

  • Citations Per Year
Learn More
Bioinformatics methods for predicting the T cell coreceptor usage from the array of membrane protein of HIV-1 are investigated. In this study, we aim to propose an effective prediction method for dealing with the three-class classification problem of CXCR4 (X4), CCR5 (R5) and CCR5/CXCR4 (R5X4). We made efforts in investigating the coreceptor prediction(More)
Log-ratio processor working at 500MHz applied to turn-by-turn beam position measurement was implemented. The processor circuit consists of two logarithmic amplifiers and a subtraction circuit. The output value is proportional to beam position. Before, the upper usable frequency of logarithmic amplify is lower than 500MHz. At present, several manufacturers(More)
Longitudinal coupled-bunch instabilities in the SRRC 1.3 GeV storage ring have been studied by analyzing the signals picked up from the stripline electrodes and rf power reflected from the cavities. The current dependence of the instability strengths was measured. As a cross check, the bunch phase jitters as a function of beam current has also been measured(More)
The equation of motion of the bunched beam is governed by the guiding fields, focusing quadrupole fields, nonlinear higher order fields such as the sextupole fields, and wake fields. It could be uncoupled or coupled motion either in the transverse planes and/or between transverse and longitudinal planes. In this study we are interested in the investigation(More)
A Sasaki-type elliptically polarizing undulator (EPU) which will be an important project of insertion device at SRRC is in the construction phase. It can produce an elliptically polarization for advance study in soft X-ray region. The precision of phase is main issue for this control system. The loads of the motor drivers vary with different magnetic force(More)
A project of global and local orbit feedback system had been launched in the Synchrotron Radiation Research Center (SRRC). In this paper, we will discuss the suppressant results of orbit feedback experiments with various vibrations and orbit drift that lead to distortions in the closed orbit and result in a larger effective emittance. Together with the(More)
The control system of accelerator complex at SRRC work well since its dedication in 1993. Several major upgrade projects will finish in the early of next millennium to improve performance of the light source. Injector of SRRC will run in 1.5 GeV in 2000 with rejuvenated control system that has been integrated to main control system recently. Orbit feedback(More)
The Taiwan Photon Source (TPS) is a 3 GeV synchrotron light source being built at the campus of NSRRC. Designs of various diagnostics are under way, and will be deployed in the future, to satisfy stringent requirements of TPS for commissioning, top-up injection, and operation. These designs, including beam intensity observation, trajectory and beam(More)
Synchrotron radiation monitor in the storage has been operated for a long time. This system is upgrading to booster operation now. The basic system includes optics, digital image acquisition, image analysis, compressed image transportation and visualization tools at workstation. The linearity and dynamic of new is discussed for some beam physics study. This(More)