Abstract: Disclosed herein are an anti-obesity agent from natural products based on angiogenesis inhibitory actions, and an angiogenesis inhibitor or a composition for inhibiting obesity, containing at least one selected from the group consisting of Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract. Because the Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract of the present invention exhibit angiogenesis inhibitory effects and obesity inhibitory effects, they may be usefully used as an agent for prevention and treatment of angiogenesis-related diseases or obesity.

Abstract: Disclosed herein are an anti-obesity agent from natural products based on angiogenesis inhibitory actions, and an angiogenesis inhibitor or a composition for inhibiting obesity, containing at least one selected from the group consisting of Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract. Because the Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract of the present invention exhibit angiogenesis inhibitory effects and obesity inhibitory effects, they may be usefully used as an agent for prevention and treatment of angiogenesis-related diseases or obesity.

Abstract: Disclosed herein are an anti-obesity agent from natural products based on angiogenesis inhibitory actions, and an angiogenesis inhibitor or a composition for inhibiting obesity, containing at least one selected from the group consisting of Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract. Because the Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract of the present invention exhibit angiogenesis inhibitory effects and obesity inhibitory effects, they may be usefully used as an agent for prevention and treatment of angiogenesis-related diseases or obesity.

Abstract: A burst mode optical repeater is provided. The burst mode optical repeater receives optical signals, which are transmitted from a plurality of optical network units (ONUs) in a passive optical network (PON) to a central office using a time division multiplexing access (TDMA) method, and relays the received optical signals using an optical-electrical-optical (OEO) method. Since the burst mode optical repeater can be installed anywhere between an optical line terminal (OLT) and the ONUs, the number of subscribers and transmission range that can be supported by a corresponding network can be increased.

Abstract: Provided are an apparatus and method for efficiently and dynamically allocating a bandwidth on a Time Division Multiple Access-based Passive Optical Network (TDMA PON).

Abstract: Provided are an optical output power control method that provides optical communication without harming the human body even when a transmission line is cut or no optical network unit (ONU) accesses a communication system, and a passive optical network (PON) system using the method. In the method, an optical signal having a predetermined period is transmitted when an optical communication system is in an abnormal state, wherein the predetermined period includes a laser-on time interval in which the optical signal has a normal power level and a laser-off time interval in which the optical signal is off or has a power level lower than the normal power level, so that the optical communication system performs optical communication without harming the human body even during the abnormal state.

Abstract: A burst-mode optical receiver is provided. The burst-mode optical receiver includes a preamplifier, a post-amplifier integrated into one body together with the preamplifier, and an operation controller for controlling operation of the preamplifier and the post-amplifier using an external reset signal input from a single external reset input terminal. As a result, it is possible to implement a burst-mode receiver for a gigabit-capable passive optical network (GPON) in which a preamplifier unit and a post-amplifier unit are integrated.

Abstract: Disclosed are a multiple passive optical network system and a wavelength splitter/combiner used in the same. The multiple passive optical network (PON) system includes a first PON, and a second PON which provides a service different in speed and capacity from the first PON while partially sharing network resources with the first PON. Thereby a subscriber can receive service through a network having a desired capacity and speed.

Abstract: Disclosed herein are an anti-obesity agent from natural products based on angiogenesis inhibitory actions, and an angiogenesis inhibitor or a composition for inhibiting obesity, containing at least one selected from the group consisting of Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract. Because the Psoraleae Semen extract, Siegesbeckiae Herba extract, and Corni Fructus extract of the present invention exhibit angiogenesis inhibitory effects and obesity inhibitory effects, they may be usefully used as an agent for prevention and treatment of angiogenesis-related diseases or obesity.

Abstract: Provided are an apparatus and method for efficiently and dynamically allocating a bandwidth on a Time Division Multiple Access-based Passive Optical Network (TDMA PON).

Abstract: Disclosed is a clock phase aligning apparatus capable of synchronizing a clock signal in the middle of an upstream burst mode data bit in an optical line terminal of a passive optical network. The clock phase aligning apparatus effectively aligns a phase of a clock signal with a phase of data during an overhead period of burst mode packet data through an over-sampling scheme and a digital scheme. Burst mode data signals are subject to an over-sampling through a high speed continuous mode analog circuit and then converted into low speed parallel signals through a parallel conversion unit. Such low speed parallel signals are processed with respect to sampling patterns through a digital look-up scheme in a logic circuit device such that the phase of data is arranged with the phase of a clock signal during a limited bit stream specified in a burst mode preamble timing.

Abstract: A burst mode optical repeater is provided. The burst mode optical repeater receives optical signals, which are transmitted from a plurality of optical network units (ONUs) in a passive optical network (PON) to a central office using a time division multiplexing access (TDMA) method, and relays the received optical signals using an optical-electrical-optical (OEO) method. Since the burst mode optical repeater can be installed anywhere between an optical line terminal (OLT) and the ONUs, the number of subscribers and transmission range that can be supported by a corresponding network can be increased.

Abstract: Provided are an optical output power control method that provides optical communication without harming the human body even when a transmission line is cut or no optical network unit (ONU) accesses a communication system, and a passive optical network (PON) system using the method. In the method, an optical signal having a predetermined period is transmitted when an optical communication system is in an abnormal state, wherein the predetermined period includes a laser-on time interval in which the optical signal has a normal power level and a laser-off time interval in which the optical signal is off or has a power level lower than the normal power level, so that the optical communication system performs optical communication without harming the human body even during the abnormal state.

Abstract: Provided are a sing-unit integrated transceiver having a pump source and a transceiver module using the transceiver.

Abstract: A system for monitoring an optical output/wavelength is employed to be used for a WDM system having a narrow channel space by structuring an etalon and photodiode as an integrated structure.

Abstract: A system for monitoring an optical output/wavelength is employed to be used for a WDM system having a narrow channel space by structuring an etalon and photodiode as an integrated structure.

Abstract: Disclosed is a method of producing an electron-absorption modulator having a reverse mesa structure. In the electron-absorption modulator, a first clad of a first conductivity type, an active layer of the first conductivity type, a second clad layer of a second conductivity type and an ohmic contact layer of the second conductivity type are formed on a semiconductor substrate of the first conductivity type. Then, a predetermined mask pattern is formed on the ohmic contact layer. Afterwards, the ohmic contact layer is etched by using the mask pattern. Then, the second clad layer and the active layer below the ohmic contact layer are etched in the form of the reverse mesa structure to expose the first clad layer. Then, the first clad layer is etched at a predetermined depth in the form of a mesa structure.