Abstract: An apparatus for measuring a concentration of a target gas includes: a gas sensor including a sensing layer having an electric resistance that changes by an oxidation reaction or a reduction reaction between gas molecules and the sensing layer; and a processor configured to, in response to the target gas being introduced along with air into the gas sensor, monitor a change of the electric resistance of the sensing layer and determine the concentration of the target gas by analyzing a shape of the change of the electric resistance.

Abstract: The invention provides a cutting segment for a cutting tool for cutting or drilling a brittle work piece such as stone, bricks, concrete and asphalt, and a cutting tool having the cutting segment. The cutting segment includes a cutting surface for cutting a work piece and a plurality of abrasive particle layers. The abrasive particle layers are disposed perpendicular to a cutting direction. Each of the abrasive layers has a plurality of abrasive particle rows in a width direction of the cutting segment. Each of the abrasive rows has a plurality of abrasive particles arranged in a line. Further, the abrasive layers have a plurality of blank sections therebetween. In the blanks sections, abrasive particles are absent or have a concentration of 70% or less with respect to those in the abrasive rows. In addition, the blank sections include relatively thick blank sections and relatively thin blank sections.

Abstract: A cleaner having a handle assembly rotatable in all directions is disclosed, the handle assembly including a housing; a handle which is capable of being gripped by a user; a connection unit which connects the handle with the housing to rotate in all directions; and an elastic unit which elastically biases the handle to a neutral position. As the handle is capable of rotating in all directions, a user can clean a surface without feeling strain in his or her joints.

Abstract: The invention relates to a cutting segment of a diamond tool for cutting or drilling a brittle workpiece such as stone, bricks, concrete and asphalt, and a diamond tool having the same. The invention allows superior cutting rate and lengthy useful life without suffering from R wear during cutting. In the cutting segment, a number of diamond particles are arranged in a plurality of plate-shaped layers stacked perpendicular to a cutting direction. Each of the diamond particle layers has a plurality of particle rows on a cutting surface. Further, at least two of the diamond particle layers are superimposed on at least one side of the cutting segment seen from the front of the cutting segment in cutting direction. The invention ensures uniform cutting by significantly reducing R wear that arises during cutting and thus enables superior cutting rate and longer useful life.

Abstract: A cleaner having a handle assembly rotatable in all directions is disclosed, the handle assembly including a housing; a handle which is capable of being gripped by a user; a connection unit which connects the handle with the housing to rotate in all directions; and an elastic unit which elastically biases the handle to a neutral position. As the handle is capable of rotating in all directions, a user can clean a surface without feeling strain in his or her joints.

Abstract: A cutting segment of a cutting tool for cutting or drilling a brittle work piece such as stone, bricks, concrete and asphalt, and a cutting tool. The cutting segment includes a cutting surface for cutting a work piece and a number of abrasive particles arranged in a plurality of rows. Each of the abrasive rows includes high-concentration parts and low-concentration parts. The high-concentration parts are grouped together to form a high-concentration area on the cutting surface and the low-concentration parts are grouped together to form a low-concentration area on the cutting surface. The cutting segment and the cutting tool are capable of improving cutting rate and useful life.

Abstract: The invention provides a cutting segment for a cutting tool for cutting or drilling a brittle work piece such as stone, bricks, concrete and asphalt, and a cutting tool having the cutting segment. The cutting segment includes a cutting surface for cutting a work piece and a plurality of abrasive particle layers. The abrasive particle layers are disposed perpendicular to a cutting direction. Each of the abrasive layers has a plurality of abrasive particle rows in a width direction of the cutting segment. Each of the abrasive rows has a plurality of abrasive particles arranged in a line. Further, the abrasive layers have a plurality of blank sections therebetween. In the blanks sections, abrasive particles are absent or have a concentration of 70% or less with respect to those in the abrasive rows. In addition, the blank sections include relatively thick blank sections and relatively thin blank sections.

Abstract: The invention relates to a cutting segment of a diamond tool for cutting or drilling a brittle workpiece such as stone, bricks, concrete and asphalt, and a diamond tool having the same. The invention allows superior cutting rate and lengthy useful life without suffering from wear during cutting. In the cutting segment, a number of diamond particles are arranged in a plurality of plate-shaped layers stacked perpendicular to a cutting direction. Each of the diamond particle layers has a plurality of particle rows on a cutting surface. Further, at least two of the diamond particle layers are superimposed on at least one side of the cutting segment seen from the front of the cutting segment in cutting direction. The invention ensures uniform cutting by significantly reducing R wear that arises during cutting and thus enables superior cutting rate and longer useful life.

Abstract: A de-blocking method and apparatus in which a block classifier determines whether the received decoded image is a planar surface or a complex surface. A first correction value calculator calculates correction values for block boundary pixels using a first filtering coefficient when the decoded image is a planar surface, an interpolator provides first correction values for pixels on the block boundary, and a second correction value calculator calculates second correction values for some block boundary pixels using a second filtering coefficient when the decoded image is a complex surface. A corrector provides a corrected image by correcting the received decoded image using the first correction values when the received decoded image is a planar surface, or using the second correction values when the received decoded image is a complex surface.

Abstract: The present invention relates to an improvement of the conventional sandwiched type saw blade shank by providing, as the intermediate layer, a coated thin sheet with tens of electro-conductive points or a thin sheet with multiple contacts to enhance weldability and to minimize the thermal deform or pressed marks, so that sound absorption, noise reduction and also heat dissipation may be maximized during a high speed cutting operation.

Abstract: The present invention is intended to provide a grinding wheel which is prevented from the one-sided wear or the wear taking place intensively at the outer side of the segments due to working load so as to improve the processed quality of the ground surface. Thus the invention proposes a grinding wheel comprising a plurality of segments attached to the underside of a rim part of a grinding wheel, a rim part for supporting the segments, rib parts for connecting the rim part with a disk part, and a disk part with a central hole for connection to a motor-operated tool, wherein the segments are each demarcated into the inner portion and outer portion around the demarcating interface and the outer portions are so treated as to constitute a higher wear resisting region than the inner portions by controlling the particle size and/or the content of the super abrasive and/or by controlling the hardness of the metal bonding material for binding the abrasive particles together, in order to prevent one-sided wear.

Abstract: The present invention is intended to provide a grinding wheel which is prevented from the one-sided wear or the wear taking place intensively at the outer side of the segments due to working load so as to improve the processed quality of the ground surface. Thus the invention proposes a grinding wheel comprising a plurality of segments attached to the underside of a rim part of a grinding wheel, a rim part for supporting the segments, rib parts for connecting the rim part with a disk part, and a disk part with a central hole for connection to a motor-operated tool, wherein the segments are each demarcated into the inner portion and outer portion around the demarcating interface and the outer portions are so treated as to constitute a higher wear resisting region than the inner portions by controlling the particle size and/or the content of the super abrasive and/or by controlling the hardness of the metal bonding material for binding the abrasive particles together, in order to prevent one-sided wear.

Abstract: The present invention relates to an improvement of the conventional sandwiched type saw blade shank by providing, as the intermediate layer, a coated thin sheet with tens of electro-conductive points or a thin sheet with multiple contacts to enhance weldability and to minimize the thermal deform or pressed marks, so that sound absorption, noise reduction and also heat dissipation may be maximized during a high speed cutting operation.