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이찬복,최승원 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.1
The main contribution of this paper can be summarized in two items as follws. Firstly, a modelling of mobile communication channel with Rayleigh fading characteristics is presented. Actual signal environments can be approximated as being real measurements by a proper mathematical representation of fluctuation of channel parameters due to Doppler effect, that is determined by the relative speed between transmitter and receiver, and noises, that vary at each sampling time. Secondly, an alternative procedure of synthesizing an adaptive equalizers is presented for recovering original signals that have been corrupted through the modelled channel. In order to compute the optimal tap coefficients for a high speed data(512 k symbol/sec) on a real-time basis, the CGM that guarantees fast and stable convergency is adopted during the training period of each frame. The coefficients obtained by the CGM are used as initial values for the LMS algorithm to trace the optimal coefficients during the data period that vary at each sampling time due to the mobility and noise at the receiver. Using the modelling presented in this paper, distributions of received signal power in various signal environments are demonstrated. The performance of the eqalizer proposed in this paper is shown as a function of BER under the various signal circumstances of mobile communications.
Metal Fuel Development and Verification for Prototype Generation IV Sodium-Cooled Fast Reactor
이찬복,Jin-SikCheon,SUNG HO KIM,박정용,주형국 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.5
Metal fuel is being developed for the prototype generation-IV sodium-cooled fast reactor (PGSFR) to be built by 2028. U–Zr fuel is a driver for the initial core of the PGSFR, and U–transuranics (TRU)–Zr fuel will gradually replace U–Zr fuel through its qualification in the PGSFR. Based on the vast worldwide experiences of U–Zr fuel, work on U–Zr fuel is focused on fuel design, fabrication of fuel components, and fuel verification tests. U–TRU–Zr fuel uses TRU recovered through pyroelectrochemical processing of spent PWR (pressurized water reactor) fuels, which contains highly radioactive minor actinides and chemically active lanthanide or rare earth elements as carryover impurities. An advanced fuel slug casting system, which can prevent vaporization of volatile elements through a control of the atmospheric pressure of the casting chamber and also deal with chemically active lanthanide elements using protective coatings in the casting crucible, was developed. Fuel cladding of the ferritic–martensitic steel FC92, which has higher mechanical strength at a high temperature than conventional HT9 cladding, was developed and fabricated, and is being irradiated in the fast reactor.
이찬복,최상명,김성진,채병기,김정현,진수신,정미경 대한감염학회 2012 Infection and Chemotherapy Vol.44 No.6
Syphilitic myelitis is a rare manifestation of neurosyphilis, whose magnetic resonance imaging findings are not well documented. The authors report on a case of a 48-year-old male who presented with acute onset of paraplegia and voiding difficulty and was diagnosed as having syphilitic myelitis. Among tests performed for the diagnosis, serum Venereal Disease Research Laboratory (VDRL)and fluorescent treponemal antibody absorbed (FTA-ABS) tests showed a positive result. Analysis of cerebrospinal fluid (CSF) showed a normal white blood cell count, increased protein, reactive VDRL, and FTA-ABS tests. Magnetic resonance imaging (MRI) of cervical and thoracic spines showed diffuse intramedullary T2-hyperintense signal intensity without T1-weighted gadolinium enhancement. The syphilitic myelitis was resolved after institution of intravenous high dose penicillin G therapy for two weeks. Additional follow-up CSF analysis performed three months after treatment showed decreased protein and negative VDRL. MRI taken nine months later appeared normal and VDRL in CSF was still negative. This case study reports on the first Korean case of acute transverse myelitis caused by syphilis.