Abstract: A method and apparatus for transceiving a multi-view video to provide a two-dimensional (2D) video service as well as a three-dimensional (3D) video service or a multi-view 3D video service is provided. When a 2D video or a 3D stereo video or multi-view 3D video is transmitted in a 2D video synthesized by a video synthesizer, format supplementary information about the synthesized video is inserted to the PSI, PES or ES_Descriptor. The synthesized 2D video is decoded by a single video decoder and the decoded synthesized video is recovered to an original video by a video recovery unit with reference to the format supplementary information.

Abstract: An interactive advertisement system and a method thereof are provided. The interactive advertisement system includes an advertiser server, a local advertisement server, and a service receiver. The advertiser server requests registration of advertisement information by setting advertisement ID including target service areas and provides services in response to an order of available services corresponding to the advertisement information. The local advertisement server stores and registers the advertisement information including the advertisement ID corresponding to the registration request of the advertiser server, multicasts the registered advertisement information with the advertisement ID through an IP network, and transmits information related to a service request to the advertiser server.

Abstract: A rigid inflatable boat has a structure to position and protect an inflatable tube without having to separate the tube from a boat body. The rigid inflatable boat may include a rubber tube that is attached to each side of a boat body. A folding panel includes one hinged end on each lower side of the boat body and another end including a hook for coupling with a fastener formed on a top portion of the boat body. The rubber tube is connected to an inner surface of the folding panel and a side portion of the boat body by a connection mechanism. The connection mechanism is configured to connect the tube to an inner surface of the folding panel and to the side of the boat body including a pair of guide plates and a pair of insertion bars. The guide plates have one side attached to the inner surface of the moveable plate and the boat body and another side formed with guide grooves disposed longitudinally along the length of boat body.

Abstract: Provided is a method of transmitting and receiving a two-way advertisement. The method is performed separately from a broadcasting being received by a client. When the client calls for the two-way advertisement, an Internet Protocol (IP)-based two-way advertisement receiving apparatus of the client requests and receives the two-way advertisement from an IP-based two-way advertisement server; stores the two-way advertisement in an advertisement storage unit, wherein the two-way advertisement is transmitted from the IP-based two-way advertisement server which refers to an advertisement area code included in the two-way advertisement and transmits the two-way advertisement by using a multicast group address corresponding to the advertisement area code; and displays the two-way advertisement on a screen of a client using terminal of the client.

Abstract: Disclosed is an apparatus for fabricating an optical fiber, which comprises a furnace for melting a sealed preform assembly to draw an uncoated optical fiber, a coater for coating the uncoated optical fiber, a capstan for drawing the optical fiber from the optical fiber preform by applying a drawing force, an adjoiner for holding a primary optical fiber preform inserted centrally into an overcladding tube with an equidistant space between the outer surface of the primary optical fiber preform and the inner surface of the overcladding tube, and a preform positioner for supporting the sealed preform assembly in a specified position with respect to the furnace.

Abstract: A method and device for providing an optical fiber secondary preform by collapsing an over-cladding tube on an optical fiber primary preform is disclosed in the present invention. The device for over cladding the optical fiber primary preform includes a hand bar as a first supporter for supporting the optical fiber primary preform, which hand bar has a sealing-up part of the over-cladding tube on an outer diameter part thereof and also includes a supporting handle tube as a second supporter for supporting the over-cladding tube, which the purity of the supporting handle tube is different from that of the over-cladding tube. Also the supporting handle tube includes a ring to make it equal two centers of the optical fiber primary preform and the over-cladding tube.

Abstract: An optical fiber for wavelength division multiplexing (WDM) communications, includes: an inner core having a predetermined refractive index, formed to a first predetermined radius from a central axis of the optical fiber, an outer core having a refractive index which is lower than the refractive index of the inner core and gets linearly smaller from its inner side to its outer side, formed on an outer side of the inner core to have a second predetermined radius, and a cladding formed on an outer side of the outer core to have a third predetermined radius.

Abstract: There are provided an optical fiber rod overcladding apparatus and method, and an optical fiber drawing method. In the preform rod overcladding method, a preform rod is clamped in a top chuck and leveled, and a glass tube is mounted in a bottom chuck and leveled. The preform rod is coaxially inserted into a glass tube. Then, the glass tube is preheated by the furnace and heated by the burner until the glass tube reaches a softening point. The preform rod is completely sealed in the glass tube by sucking air in a clearance between the preform rod and the glass tube by application of a negative vacuum pressure. Thus, a preform is completed.

Abstract: Disclosed is an optical fiber possible to prevent it from increasing an optical loss occurring during fabrication of a single mode fiber preform and extraction thereof and enhance an optical transmission efficiency, a method of producing the same comprising the steps of forming a first quartz tube having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a clad layer inside said first quartz tube to form a preliminary perform by heating of said fist quartz tube; forming a second quartz tube having a second thermal conductivity lower than said first thermal conductivity; and depositing said second quartz tube to said preliminary preform by heating to produce said optical fiber preform.

Abstract: A method of fabricating a dispersion shifted optical fiber with a smooth annular ring refractive index profile has the steps of heating a quartz tube with an external oxygen or hydrogen burner and supplying the quartz tube with raw materials including SiCl.sub.4, GeCl.sub.4, POCl.sub.3 and CF.sub.4. O.sub.2 is later supplied. Then, the quartz tube is heated in nine passes of decreasing temperature from 1920.degree. C. to 1890.degree. C., so as to deposit a core section. In the nine passes, the quantity of SiCl.sub.4 feed flow decreases from 380 milligrams per minute to 260 milligrams per minute, the quantity of GeCl.sub.4 feed flow increases from 20 milligrams per minute to 195 milligrams per minute, and the quantity of O.sub.2 feed flow is kept constant at 1500 cubic centimeters per minute.

Abstract: Disclosed is an optical fiber capable of preventing an increase in an optical loss from occurring during fabrication and extraction of a single mode fiber preform and enhancement of an optical transmission efficiency, a method of producing the same comprising the steps of forming a first quartz robe having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a clad layer inside the first quartz robe to form a preliminary perform by heating of the fist quartz robe; forming a second quartz tube having a second thermal conductivity lower than the first thermal conductivity; and depositing the second quartz tube to said preliminary preform by heating to produce the optical fiber preform. On embodiment, uses N overclad layers having thermal conductivites K.sub.x such that K.sub.0 >K.sub.1 >K.sub.2 . . . >K.sub.N and coefficients of viscosity .mu..sub.0 <.mu..sub.1 <.mu..sub.2 . . . <.mu..sub.N.