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Partially composite two-Higgs doublet model
Chung, Byungchul,Lee, Kang Young,Jung, Dong-Won,Ko, Pyungwon IOP Publishing Ltd 2006 Journal of high energy physics Vol.2006 No.5
In the extra dimensional scenarios with gauge fields in the bulk, the Kaluza-Klein (KK) gauge bosons can induce Nambu-Jona-Lasinio (NJL) type attractive four-fermion interactions, which can break electroweak symmetry dynamically with accompanying composite Higgs fields.We consider a possibility that electroweak symmetry breaking (EWSB) is triggered by both a fundamental Higgs and a composite Higgs arising in a dynamical symmetry breaking mechanism induced by a new strong dynamics. The resulting Higgs sector is a partially composite two-Higgs doublet model with specific boundary conditions on the coupling and mass parameters originating at a compositeness scale Λ. The phenomenology of this model is discussed including the collider phenomenology at LHC and ILC.
Beam Optics Design of a 100-MeV Beam Line for PEFP Users
Byungchul Chung,Yong Young Lee,Yong-sub Cho 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The beam delivery systems of the Proton Engineering Frontier Project (PEFP) linear accelerator provide users with 20-MeV and 100-MeV proton beams. Each beam delivery system is divided into five different beam transport lines to satisfy a user's specific requirements. For the 100-MeV beam transport lines, this work examines the beam line optics for extending the vertical beam in the target room. Beam optics, as well as proper components for each part of the 100-MeV vertical beam transport line, are studied by using the well-known TRACE-3D code and Parmila code. The space charge effects do not crucially affect the beam evolution along the PEFP 100-MeV beam line. A consistency check between TRACE-3D and Parmila was accomplished for the investigation of the beam line optics.
Feasibility Study of Robotics-based Patient Immobilization Device for Real-time Motion Compensation
Chung, Hyekyun,Cho, Seungryong,Cho, Byungchul Korean Society of Medical Physics 2016 의학물리 Vol.27 No.3
Intrafractional motion of patients, such as respiratory motion during radiation treatment, is an important issue in image-guided radiotherapy. The accuracy of the radiation treatment decreases as the motion range increases. We developed a control system for a robotic patient immobilization system that enables to reduce the range of tumor motion by compensating the tumor motion. Fusion technology, combining robotics and mechatronics, was developed and applied in this study. First, a small-sized prototype was established for use with an industrial miniature robot. The patient immobilization system consisted of an optical tracking system, a robotic couch, a robot controller, and a control program for managing the system components. A multi speed and position control mechanism with three degrees of freedom was designed. The parameters for operating the control system, such as the coordinate transformation parameters and calibration parameters, were measured and evaluated for a prototype device. After developing the control system using the prototype device, a feasibility test on a full-scale patient immobilization system was performed, using a large industrial robot and couch. The performances of both the prototype device and the realistic device were evaluated using a respiratory motion phantom, for several patterns of respiratory motion. For all patterns of motion, the root mean squared error of the corresponding detected motion trajectories were reduced by more than 40%. The proposed system improves the accuracy of the radiation dose delivered to the target and reduces the unwanted irradiation of normal tissue.
최병철(Byungchul Choi),김길남(Gilnam Kim),정석호(Sukho Chung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Characteristics of laminar lifted flames for highly diluted propane with nitrogen have been investigated in various co-flow temperatures up to 1000 K, including the behaviors of liftoff height and liftoff velocity. When the co-flow temperature was above 940 K, the flame was auto-ignited at a certain height above fuel nozzle tip, which exhibited unique characteristics as compared to the laminar lifted flames for T?≤900K. When the flame was auto-ignited, it is faint and colors weak blue such as mild combustion at high temperature. As increasing initial temperature in the autoignition range, the ignition delay time exponentially decreases and the propagation speed almost linearly increases. Consequently, based on the balance mechanism for the stabilization of laminar lifted flame, the jet velocity to make a lifted flame in the auto-ignition temperature range should be exponentially increased. By the way, the jet velocity range for the balance mechanism could be steadily decreased and finally disappeared by increasing initial temperature.