Abstract: The techniques described herein may provide an efficient and secure two-party distributed signing protocol, for example, for the IEEE P1363 standard. For example, in an embodiment, method may comprise generating, at a key generation center, a first partial private cryptographic key for a user ID and a second partial private cryptographic key for the user ID, transmitting the first partial private cryptographic key to a first other device, transmitting the second partial private cryptographic key to a second other device, and generating a distributed cryptographic signature for a message using the first partial private cryptographic key and the second partial private cryptographic key.

Abstract: The techniques described herein may provide an efficient and secure two-party distributed signing protocol for the identity-based signature scheme described in the IEEE P1363 standard. For example, in an embodiment, a method may comprise generating a distributed cryptographic key at a key generation center and a first other device and a second other device and generating a distributed cryptographic signature at the first other device using the second other device.

Abstract: The techniques described herein may provide an efficient and secure two-party distributed signing protocol, for example, for the IEEE P1363 standard. For example, in an embodiment, method may comprise generating, at a key generation center, a first partial private cryptographic key for a user ID and a second partial private cryptographic key for the user ID, transmitting the first partial private cryptographic key to a first other device, transmitting the second partial private cryptographic key to a second other device, and generating a distributed cryptographic signature for a message using the first partial private cryptographic key and the second partial private cryptographic key.

Abstract: The techniques described herein may provide an efficient and secure two-party distributed signing protocol, for example, for the IEEE P1363 standard. For example, in an embodiment, method may comprise generating, at a key generation center, a first partial private cryptographic key for a user ID and a second partial private cryptographic key for the user ID, transmitting the first partial private cryptographic key to a first other device, transmitting the second partial private cryptographic key to a second other device, and generating a distributed cryptographic signature for a message using the first partial private cryptographic key and the second partial private cryptographic key.

Abstract: The techniques described herein may provide an efficient and secure two-party distributed signing protocol for the identity-based signature scheme described in the IEEE P1363 standard. For example, in an embodiment, a method may comprise generating a distributed cryptographic key at a key generation center and a first other device and a second other device and generating a distributed cryptographic signature at the first other device using the second other device.

Abstract: The present invention relates to a heat exchanger for a vehicle, and more particularly, to a highly efficient thin heat exchanger for reducing the weight of a vehicle body and enhancing heat radiation performance. In the present invention, there is provided an optimal design range for maximizing heat radiation performance of the radiator using a concept of thermal resistance.

Abstract: The present invention relates to a heat exchanger for a vehicle, and more particularly, to a highly efficient thin heat exchanger for reducing the weight of a vehicle body and enhancing heat radiation performance. In the present invention, there is provided an optimal design range for maximizing heat radiation performance of the radiator using a concept of thermal resistance.

Abstract: An optical pickup actuator for use with a recording medium includes a swing arm pivoting in a tracking direction with respect to the recording medium, a first driving unit pivoting the swing arm, an optical pickup facing the recording medium, an elastic member having one end fixed to the swing arm and a free end portion elastically deformable in a focus direction with respect to the recording medium, wherein the optical pickup is coupled to the free end portion of the elastic member, and a second driving unit deforming and driving the elastic member.

Abstract: An optical pickup actuator for use with a recording medium includes a swing arm pivoting in a tracking direction with respect to the recording medium, a first driving unit pivoting the swing arm, an optical pickup facing the recording medium, an elastic member having one end fixed to the swing arm and a free end portion elastically deformable in a focus direction with respect to the recording medium, wherein the optical pickup is coupled to the free end portion of the elastic member, and a second driving unit deforming and driving the elastic member.

Abstract: A higher order mode generator includes a straight waveguide having upper and lower cladding layers and a core layer which support higher order modes higher than the 0th order. A linear heater is disposed across the waveguide at a tilt angle &agr; with respect to the waveguide. For converting the 0th order optical guiding mode into the mth order optical guiding mode, a tilt angle &agr; of the linear heater and the mth order mode propagation angle &thgr;m satisfy the condition: &agr;>&thgr;m/2.

Abstract: In a time-saving machine embroidering method, an auxiliary frame, having clamped therein an auxiliary backing material, is placed in the frame of an embroidering machine. A motif is then embroidered onto the auxiliary backing material, and the auxiliary frame together with the auxiliary backing material is removed from the frame. The material to be embroidered is fixed in the frame, and subsequently the auxiliary frame with the embroidered auxiliary backing material positioned above the material to be embroidered is again fixed in the frame. Subsequently, the motif embroidered already is only fixed on the material by means of embroidering or sewing stitches. Finally, the auxiliary frame and the material provided with the motif are removed from the frame and the auxiliary backing material is removed.

Abstract: Disclosed is a pollution-free food confirmation and sales system using a moving picture on the Internet, comprising: a plurality of web cameras installed in a foods producing area; a web server adapted receive pictures of foods photographed by the plurality of web cameras; a database connected to the web server and adapted to store various picture information associated with the foods therein and providing it to users; an Internet network adapted to connect the web server and the users; and a plurality of user personal computers (PCs) having an Internet communication means installed therein and connected to the web server through the Internet network so that the users access the web server, whereby the pollution-free food confirmation and sales system is implemented by using a method of confirming and selling pollution-free food, comprising the steps of: accessing a web server through the Internet network; selecting the type of foods; selecting a foods producing area corresponding to the selected type of food

Abstract: In a time-saving machine embroidering method, an auxiliary frame, having clamped therein an auxiliary backing material, is placed in the frame of an embroidering machine. A motif is then embroidered onto the auxiliary backing material, and the auxiliary frame together with the auxiliary backing material is removed from the frame. The material to be embroidered is fixed in the frame, and subsequently the auxiliary frame with the embroidered auxiliary backing material positioned above the material to be embroidered is again fixed in the frame. Subsequently, the motif embroidered already is only fixed on the material by means of embroidering or sewing stitches. Finally, the auxiliary frame and the material provided with the motif are removed from the frame and the auxiliary backing material is removed.

Abstract: An under thread bobbin exchange device for an industrial embroidery machine or sewing machine of a type having a hook shaft adapted for driving a shuttle, includes a carriage having at least two coupling shafts in parallel disposition to the hook shaft, each of said coupling shafts having a hook shaft distal end and a hook shaft proximal end, with the hook shaft proximal end capable of being coupled to the hook shaft such that the carriage is positioned at a right angle to the hook shaft when the hook shaft is at a standstill and capable to reciprocate in parallel disposition to a throat plate plane by the distance of the coupling shafts, and with each one of the hook shaft distal ends carrying a shuttle.

Abstract: A process for providing an article with a machine-made embroidery pattern in relief, includes the steps of placing a base material of paper and cardboard upon the article, embroidering an embroidery pattern on the base material and the article, and removing the base material in a water bath while subjecting the water bath to ultrasound.