Abstract: Provided are a tetrapeptide for inhibiting VEGF-induced angiogenesis and a use thereof, and particularly, provided is a peptide having the amino acid sequence of R-X1-X2-E (wherein X1 is leucine (L), isoleucine (I) or valine (V), and X2 is tyrosine (Y) or phenylalanine (F)) for inhibiting angiogenesis, or preventing, improving or treating cancer. This research was supported by grants from the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (MSIP), Republic of Korea, in 2011 and 2013 [NRF-2011-0028790 and 2013M3A9B6046563]. The tetrapeptide may effectively inhibit VEGF-induced angiogenesis or growth of cancer cells without a risk of side effects, and therefore may be expected to exhibit an excellent anticancer effect.

Abstract: Disclosed is a method of producing trioxane, including: (A) preparing trioxane from a high-concentration formaldehyde aqueous solution in the presence of an acid catalyst; (B) distilling a mixture including trioxane; (C) liquefying the distilled gas mixture; (D) mixing the liquefied liquid mixture with an extraction solvent and separating the mixture into an aqueous phase and a solvent phase; (E) distilling the solvent phase to give trioxane, and mixing the aqueous phase with the extraction solvent to give a mixture, which is then separated into an aqueous phase and a solvent phase; and (F) discharging the aqueous phase separated in (E) out of the system, and recirculating the solvent phase so as to be reused in (D) and (E).

Abstract: Provided are a reinforced fabric for substitution of vinyl and its manufacturing method which comprises a process (s1)) in which a HDPE and a UV reinforcing agent are mixed and liquefied and processed into a film; a thread manufacture process (s2); an elongation-cooling process (s3); a weaving process (s4); an original tissue recovery process; a LDPE-UV mixing liquid coating process; and a cutting or linking process (s7). The reinforced fabric for substitution of vinyl manufactured through the above described processes has an enhanced resistance with respect to durability and temperature and moisture, so the service life can be prolonged.

Abstract: Provided is a pipe welding apparatus, including: a support fixed to the ground; a torch which is supported by the support and is formed to correspond to a welding portion of a pipe; and a first rotation part for rotating the torch in a circumferential direction of the pipe up to a predetermined angle.

Abstract: Provided is a pipe welding apparatus, including: a support fixed to the ground; a torch which is supported by the support and is formed to correspond to a welding portion of a pipe; and a first rotation part for rotating the torch in a circumferential direction of the pipe up to a predetermined angle.

Abstract: A developing apparatus usable with an image forming apparatus includes a developer carrier includes a plurality of magnetic poles and a case to rotatably support the developer carrier, the case storing developer is supplied to the developer carrier, and a magnetic pole changing apparatus disposed at an end of the developer carrier to change a position of the plurality of magnetic poles with respect to the case.

Abstract: A developing apparatus usable with an image forming apparatus includes a developer carrier includes a plurality of magnetic poles and a case to rotatably support the developer carrier, the case storing developer is supplied to the developer carrier, and a magnetic pole changing apparatus disposed at an end of the developer carrier to change a position of the plurality of magnetic poles with respect to the case.

Abstract: Disclosed are a color image forming apparatus for mono color printing and a method thereof. The apparatus includes photoconductors, a charger, a development unit for forming a developer image on each of the photoconductors, a transfer unit including an image transfer member for receiving the developer image from each of the photoconductors and a transfer voltage supply member for supplying a transfer bias voltage to the image transfer member, a first cleaning unit for cleaning the photoconductors, and a control unit for controlling the photoconductors, charger, development unit and transfer unit in a mono color printing mode to form a developer image on an image area of a selected photoconductor, to transfer the formed developer image to a non-image area of the image transfer member, and to divide the transferred developer image into portions and reverse-transfer the divided portions from the image transfer member to remaining photoconductors.

Abstract: An image forming apparatus includes an image former which comprises a photosensitive body and a developing device to apply a developer to the photosensitive body, a power supply which supplies developing voltage to the developing device, a detector which detects a density of an image formed by the image former, and a controller which controls the power supply to adjust a level of the developing voltage if the detected density is out of a permissible range.

Abstract: A 1.55 ?m SLD having a laser diode (LD) region and a semiconductor optical amplifier (SOA) region, and a method of fabricating the same, are disclosed. The SLD includes: an InP substrate having a LD region and a SOA region for amplifying light emitted from the LD region; an optical waveguide having a BRS (buried ridge strip) structure having an active layer of resonant strip pattern formed on the InP substrate and extending from the SOA region to the LD region; a first electrode formed on the active layer in the SOA region, a second electrode formed on the active layer in the LD region and electrically isolated from the first electrode; and a current blocking region interposed between the first electrode and the second electrode in order to electrically isolate the first electrode and the second electrode from each other.

Abstract: A housing assembly of an OPC unit to protect an OPC drum in an image forming apparatus includes a main housing enclosing at least a half of a large-diameter OPC drum and provided with a main-opening selectively contacting a plurality of developing units and a plurality of sub-openings, a first housing and a second housing each mounted on a side of the main housing, a handle hingedly connected to the main housing, and a plurality of brackets mounted on opposite sides of the main housing. As a result, the housing assembly of the OPC unit allows easy development, electrification, exposure, image transfer and treatment of a waste toner, and reliability of the image developing process increases due to the fixation of the developing units. Also, since the exposure of the OPC drum is minimized, an area of the OPC drum to be contaminated can be reduced.

Abstract: An organic photoconductive (OPC) unit of an image forming apparatus and a gear assembly arranged in the OPC unit. The gear assembly includes a drum gear formed on a flange of an OPC drum, a cleaning gear driven by a receiving power from the drum gear, and at least one idle gear interposed between the drum gear and the cleaning gear and transmitting the rotational force of the drum gear to the cleaning gear. Therefore, it is possible to drive a plurality of additional rollers with a single power source, and easy to connect the OPC drum with the gears when the OPC drum is fitted into the OPC unit. In addition, because the gear assembly is constructed in a compact form, it is possible to reduce the volume of the OPC unit.

Abstract: An image forming apparatus capable of improving transfer properties, and a method for improving the transfer properties are provided by the invention. According to the method of the present invention, a surface of a photoconductive medium is electrified by applying a voltage to the photoconductive medium. An electrostatic latent image is formed on the surface of the electrified photoconductive medium. A visible image is formed by supplying toner to the surface of the photoconductive medium whereon the electrostatic latent image is formed, and the visible image of the photoconductive medium is transferred onto a paper. In the transferring step, the resistance of the paper is measured, and the image transfer is performed by maintaining a current electrifying potential if the resistance of the paper is lower than a predetermined value and lowering the current electrifying potential of the photoconductive drum if equal to or greater than a predetermined value.

Abstract: A charging voltage supply and a method for supplying a charging voltage are provided. The charging voltage supply generates a voltage and branches the generated voltage to at least one charging roller according to voltage applied to a transfer roller. Accordingly, the charging voltage supply can compensate for the charging voltage in view of the reduction of a charging potential of a photosensitive body according to the transfer voltage.

Abstract: A waveguide PIN photodiode is provided. The waveguide PIN photodiode includes a lower light guide layer, a light absorption layer, an upper light guide layer, and a cladding layer. The lower light guide is formed on a substrate, and the light absorption layer is formed on the lower light guide layer. The upper light guide layer is formed on the light absorption layer, and the cladding layer is formed on the upper light guide layer. The lower light guide layer, the light absorption layer, and the upper light guide layer constitute a core layer, which is an optical waveguide, and graded index distribution is symmetrically formed in a depth direction, centering around the light absorption layer having a highest refractive index.

Abstract: Provided is an optical transceiver module of an optical transceiver, which is used for optical communications. The optical transceiver module prevents electrical crosstalk between a light source and a light receiver. Additionally, the optical transceiver module includes an optical transceiver unit including a light source and a light receiver together integrated into a substrate, a circuit unit including a drive circuit driving the light source and a detect circuit reading a signal of the light receiver, and a crosstalk prevention unit connected between the substrate and ground to prevent electrical crosstalk between the light source and the light receiver.

Abstract: Provided is a buried ridge waveguide laser diode that has improved temperature characteristics and can reduce optical loss by a leakage current. The buried ridge waveguide laser diode includes: a ridge region that extends vertically with a constant width and is composed of a selective etching layer and a first compound layer formed of a first conductive type material on a portion of the clad layer; and a p-n-p current blocking layer that has a thickness identical to the depth of the ridge region on the clad layer outside the ridge region and includes a second compound layer formed of a second conductive type material opposite to the first conductive type material. At this time, the current blocking layer includes the first compound layer extending on the second compound layer.

Abstract: A photoreceptor unit includes a photoconductive drum assembly, a housing to enclose the photoconductive drum assembly to be rotatable therein, a handgrip rotatably formed on the housing, and a stopper to prevent the housing with the photoconductive drum assembly from becoming lopsided toward its preponderant side of the housing with respect to a center of rotation of the handgrip when the housing is lifted up by the handgrip.

Abstract: Provided are a temperature-insensitive polymeric optical AWG device and a method of manufacturing the same.

Abstract: A color image forming apparatus for mono color printing and a method thereof are disclosed.