Abstract: A power semiconductor device includes a semiconductor layer of silicon carbide (SiC), at least one trench that extends in one direction, a gate insulating layer disposed on at least an inner wall of the at least one trench, at least one gate electrode layer disposed on the gate insulating layer, a drift region disposed in the semiconductor layer at least on one side of the at least one gate electrode layer, a well region disposed in the semiconductor layer to be deeper than the at least one gate electrode layer, a source region disposed in the well region, and at least one channel region disposed in the semiconductor layer of one side of the at least one gate electrode layer between the drift region and the source region.

Abstract: A semiconductor device and a method of fabricating the same are provided. According to the present invention, a semiconductor device comprises an active region formed in a substrate, and including flat surfaces and hole-shaped recess portions; upper-level plugs disposed over the flat surfaces; a spacer disposed between the upper-level plugs and providing a trench exposing the hole-shaped recess portions; a lower-level plug filling the hole-shaped recess portions; and a buried conductive line disposed over the lower-level plug and partially filling the trench.

Abstract: An electronic device may include a semiconductor memory structured to include a plurality of memory cells, wherein each of the plurality of memory cells may comprise: a first electrode layer; a second electrode layer; and a selection element layer disposed between the first electrode layer and the second electrode layer to electrically couple or decouple an electrical connection between the first electrode layer and the second electrode layer based on a magnitude of an applied voltage or an applied current with respect to a threshold magnitude, wherein the selection element layer has a dopant concentration profile which decreases from an interface between the selection element layer and the first electrode layer toward an interface between the selection element layer and the second electrode layer.

Abstract: A multi-stage transmission bicycle, comprises: a transmission plate which rotates with the pedals and has a plurality of transmission gear teeth formed concentrically on the surface and driving gear teeth on the outer peripheral side; a transmission unit having an input shaft, which is coupled to the driving teeth and is for receiving transmission of the rotational force, a ring gear, which rotates by means of the input shaft, an output shaft, which is disposed inside the ring gear, has a sun gear, and is coupled to the rear wheel, pinion gears, which are coupled to the sun gear and inner gear teeth of the ring gear, a carrier, which couples the pinion gears, and a driving gear which is gear coupled to the carrier; and a number-of-revolutions changing module for changing the rotational direction of the driving gear and the number of revolutions of the driving gear.

Abstract: A multi-stage transmission comprises: a ring gear having inner gear teeth formed on the inner side; a first transmission module comprising first shaft, which is disposed on the inner side of the ring gear and has a first sun gear formed on the outer peripheral side, a first pinion gear, which is a gear coupled to the first sun gear and the inner gear teeth, and a first transmission unit which enables rotation and revolution of the first pinion gear inside the ring gear; and a second transmission module comprising a second shaft, which is disposed on the inner side of the ring gear and has a second sun gear formed on the outer peripheral side, a second pinion gear, which is a gear coupled to the second sun gear and the inner gear teeth, and a second transmission unit which enables rotation and revolution of the second pinion gear inside the ring gear.

Abstract: A power transmission apparatus which includes a planetary gear set with a planetary carrier of which one side extending to form gear teeth, wherein rotating speed input from a driving power source is reduced and then input to one actuating means, rotating speed of a gear-shifting power source is input to another actuating means to achieve a plurality of gear shifts, generating power is obtained from an output shaft to store electricity to a storage battery, the stored electric energy is utilized as controlling energy for gear-shifting power so that a transmission input shaft can be easily controlled.

Abstract: Provided are hexaaza[3.3.3]propellane compounds represented by the following formula (I), which can be used as a main skeleton structure for novel molecular explosives and method for preparing the same: wherein, R is H, C1-C20 alkyl, cycloalkyl, arylalkyl or aryl, which may contain heteroatoms such as oxygen, nitrogen, sulfur, halogen, etc. or unsaturations; and X is H2, O or S.

Abstract: The present invention relates to a power transmission apparatus which includes a planetary gear set with a planetary carrier of which one side extending to form gear teeth, wherein rotating speed input from a driving power source is reduced and then input to one actuating means, rotating speed of a gear-shifting power source is input to another actuating means to achieve a plurality of gear shifts, generating power is obtained from an output shaft to store electricity to a storage battery, the stored electric energy is utilized as controlling energy for gear-shifting power so that a transmission input shaft can be easily controlled.

Abstract: The present invention relates to a planetary gear set and a power transmitting apparatus. In the planetary gear set, a gear tooth is formed by extending one side of a planetary carrier. In the power transmitting apparatus, multi-stage transmission is enabled by reducing a rotational speed inputted from a power-driving source and then inputting the reduced rotational speed to one operational member of the planetary gear set as well as the rotational speed of a speed changing power source to another operational member of the planetary gear set.

Abstract: Disclosed is a 4 wheel drive apparatus for vehicles capable of driving two wheel or four wheels having a simple structure without conventional transfer case. The 4 wheel drive apparatus for vehicles includes a driving shaft connected to an engine, receiving a power from the engine, and having plural driving gears connected to thereon; a transmission including plural change gears geared with the plural driving gears, and an output shaft connected to front wheels and rear wheels of the vehicle; a front power transfer part including a front clutch installed on one end of the output shaft and transferring/blocking a power of the output shaft to the front wheels; a rear power transfer part including a rear clutch installed on the other end of the output shaft and transferring/blocking a power of the output shaft to the rear wheels; and a control part controlling the front and rear power transfer parts in order to restrict a power transferred from the output shaft to the front wheels 20 and the rear wheels.

Abstract: Brake system for automobile is disclosed. The brake system comprises a braking gear for supplying a braking force to an output shaft, a first braking member for making the braking gear stop, an operator for operating the first braking member and a third braking member for selectively making speed change gears stop, and a controller for controlling the operator. The breaking gear meshes continuosly with a driving gear and is coaxially aligned with the output shaft. The first braking member engages the braking gear to connect or disconnect the supply of power from a driving shaft to the braking gear. The controller receives a braking signal generated by a braking treadle and controls the operator to disconnect the supply of power from the driving shaft to the speed change gears and engage the braking gear by an operation of the first braking member.

Abstract: Propellers of a marine transport vessel may be independently controlled at their optimal speed when at least one transmission having a plurality of output shafts capable of independent-speed ratios is connected to an engine and the propellers are respectively mounted at the output shafts of the transmission.

Abstract: Brake system for automobile is disclosed. The brake system comprises a braking gear for supplying a braking force to an output shaft, a first braking member for making the braking gear stop, an operator for operating the first braking member and a third braking member for selectively making speed change gears stop, and a controller for controlling the operator. The breaking gear meshes continuosly with a driving gear and is coaxially aligned with the output shaft. The first braking member engages the braking gear to connect or disconnect the supply of power from a driving shaft to the braking gear. The controller receives a braking signal generated by a braking treadle and controls the operator to disconnect the supply of power from the driving shaft to the speed change gears and engage the braking gear by an operation of the first braking member.

Abstract: Propellers of a marine transport vessel may be independently controlled at their optimal speed when at least one transmission having a plurality of output shafts capable of independent-speed ratios is connected to an engine and the propellers are respectively mounted at the output shafts of the transmission.

Abstract: Power transmission device for automobile is disclosed. The power transmission device for automobile comprises a driving shaft (10), an output shaft (30) a transmission (20), a differential gear part (50) and a four-wheel drive part (60). The driving shaft (10) has a plurality of driving gears (12), each of them having a different diameter respectively. The driving shaft (10) is connected to an engine (E). The output shaft (30) is a hollow shaft and outputs power from the driving shaft (10). The transmission (20) has a plurality of speed change gears (22) meshing continuously with the driving gears (12) and also has a brake member braking the speed change gears (22) selectively to transfer power to the output shaft (30). The differential gear part (50) is located at an end portion of the output shaft (30) and controls the amounts of rotation of both right and left front wheels (42). The four-wheel drive part (60) is fixed on the output shaft (30) and transfers power to rear wheels (44) selectively.

Abstract: The invention provides a fastener whose torque-receiving circumference is either circular or polygonal with more than twelve angles. In order to manipulate such a fastener, a wrench and a socket for a socket wrench have a housing having an interior space, and a fastening unit disposed in the interior space of the housing, wherein the fastening unit includes a plurality of sprags and ends of the sprags each protrude toward the interior space of the housing forming an arc, are provided.

Abstract: Utility is enhanced by an adjustable wrench including a fixed jaw fixedly formed at the body, an adjustable jaw adjustable relative to the fixed jaw, and a fastening unit disposed at one or each of the fixed jaw and the adjustable jaw, the fastening unit including a plurality of sprags such that one end of each of the sprags is linearly aligned facing the opposite jaw.

Abstract: Power transmission device for automobile is disclosed. The power transmission device for automobile comprises a driving shaft(10), an output shaft(30) a transmission(20), a differential gear part(50) and a four-wheel drive part(60). The driving shaft(10) has a plurality of driving gears(12), each of them having a different diameter respectively. The driving shaft(10) is connected to an engine(E). The output shaft(30) is a hollow shaft and outputs power from the driving shaft(10). The transmission(20) has a plurality of speed change gears(22) meshing continuously with the driving gears(12) and also has a brake member braking the speed change gears(22) selectively to transfer power to the output shaft(30). The differential gear part(50) is located at an end portion of the output shaft(30) and controls the amounts of rotation of both right and left front wheels(42). The four-wheel drive part(60) is fixed on the output shaft(30) and transfers power to rear wheels(44) selectively.

Abstract: A clutchless automatic transmission comprises a hyper-overdrive for connecting first and second drive transmitting members, and a planetary transmission for varying the speed and direction of the output shaft with respect to the second drive transmitting member. The planetary transmission includes (1) multiple forward transmitting gearsets for changing the speed transmitted by the second drive transmitting member into a speed ratio of at least three, (2) a backward transmitting gearset for changing the direction of rotation, (3) plural hydraulically driven brake members for selectively braking a carrier of the forward transmitting gearset or a carrier of the backward transmitting gearset, and (4) a transmission lever for driving the brake members based upon an electric signal. The planetary transmission meshes continuously with the input power source without a clutch. The configuration is simple and compact. A speed change can be accomplished easily with an electric signal.