Abstract: A radio repeater system is provided that utilizes miniaturized antennas and a meta-material channel isolator. The radio repeater is comprised of: a receive antenna configured to receive a signal at a desired channel frequency; a transmit antenna configured to transmit the signal at the channel frequency; an amplifier electrically connected between the receive antenna and the transmit antenna; and an array of resonating circuits disposed spatially between the receive antenna and the transmit antenna. Each resonating circuit is designed to resonant at the channel frequency and thereby suppress propagation of surface waves between the antennas.

Abstract: A switching mode power supply (SMPS) including a surge protection unit that is connected to a protection pin of a pulse width modulation (PWM) controller to cut off a power supply of the SMPS when a voltage that is applied to the protection pin exceeds a predetermined threshold voltage, where the surge protection unit blocks an external surge voltage lower than a surge protection capacity of the surge protection unit for blocking a surge voltage input from outside thereof, and, when the output voltage of the SMPS is not within the predetermined range, the surge protection unit applies a voltage obtained by subtracting the surge protection capacity of the surge protection unit from a predetermined feedback voltage output from a feedback unit to the protection pin, and where the surge protection capacity is set higher than the predetermined threshold voltage of the protection pin.

Abstract: A radio repeater system is provided that utilizes miniaturized antennas and a meta-material channel isolator. The radio repeater is comprised of: a receive antenna configured to receive a signal at a desired channel frequency; a transmit antenna configured to transmit the signal at the channel frequency; an amplifier electrically connected between the receive antenna and the transmit antenna; and an array of resonating circuits disposed spatially between the receive antenna and the transmit antenna. Each resonating circuit is designed to resonant at the channel frequency and thereby suppress propagation of surface waves between the antennas.

Abstract: The present invention relates to a radionuclide-chitosan complex solution and its preparation method, and more particularly to the radionuclide-chitosan complex solution having a viscosity of 300˜2,400 cps, comprising an aqueous chitosan solution or a freeze-dried chitosan labeled with a radionuclide. The radionuclide-chitosan complex solution according to the present invention has a stable gelation state at a target region when injected into the body while maintaining a labeling yield of radioisotope to chitosan above 99%. Side effects may be minimized and treatment efficiency may be increased when injected to a patient.

Abstract: The present invention relates to a method for preparing a radioactive film for local radioactive treatment. More particularly, the present invention relates to a method for preparing a radioactive film comprising the steps of; dissolving 0.1˜14.5 weight % of a stable nuclide and 13˜32.5 weight % of a film-forming base for the total amount of a solvent in the solvent; applying a stable nuclide solution on a release paper by a coater and drying; and irradiating a stable nuclide film with neutrons in a nuclear reactor. A method for preparing a radioactive film according to the present invention provides a radioactive film having a uniform distribution of radionuclides and an even thickness. Therefore, the therapeutic efficacy of the radioactive film for selective treatment of a lesion may be maximized by attaching the radioactive film on a patient's skin or a mucous membrane and by direct radioactive radiation.

Abstract: Disclosed is a composition for treating prostate cancer. The composition for treating prostate cancer comprises as an effective ingredient a radioisotope-chitosan complex that includes a therapeutic radioisotope emitting beta radiation and chitosan. Also, the present invention discloses a kit for preparing the composition. When directly administered to a prostate cancer tissue, the radioisotope- chitosan complex is deposited in the applied target site while not leaking from the applied target site, and strongly inhibits the growth of prostate cancer cells while minimizing the side effects of conventional therapies, including urinary incontinence, urethral stricture and rectal bleeding. In addition, the radioisotope-chitosan complex may be used as an effective therapeutic agent for hormone-independent prostate cancer that is resistant to hormone therapy.

Abstract: Disclosed is a home gateway apparatus having an in-home telephone network switching function, and an embodiment method thereof. The home gateway apparatus offers high-speed access to an access network using xDSL (“x” variety of Digital Subscriber Line) protocols such as ADSL or VDSL and an in-home network using VoIP (Voice over Internet Protocol) functions and a variety of protocols, and has xDSL and VoIP interfaces with PSTN (Public Switching Telephone Network) and VoIP functions that enable easy installation and application in different in-home telephone network environments. Using this, in-home VoIP/POTS (Plain Old Telephone Service) networks and high-speed HomePNA networks can be freely constructed through a single home gateway, bypassing the existing two-wire or four-wire in-home telephone lines.