Abstract:
An OFDM transmission apparatus having minimal transmission delay comprises a training symbol storage and generation unit, a delay unit and a controller. The training symbol storage and generation unit stores training symbols for the preamble, and outputs the stored training symbols when a training symbol output request signal is received. The delay unit receives data for the signal field from the MAC layer, delays the received data by the data processing time of the scrambler, and outputs the delayed data to the convolution encoder. The controller outputs the training symbol output request signal, requesting the preamble of the frame, to the training symbol storage and generation unit when a frame transmission request is received from the MAC layer, and outputs a data request signal, requesting the signal field and the data field, to the MAC layer in consideration of total data processing time (TPROCESS).
Abstract:
Red phosphorescene compounds and organic electro-luminescence device using the same are disclosed. In an organic electroluminescence device including an anode, a hole injecting layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injecting layer, and a cathode serially deposited on one another, the organic electroluminescence device may use a compound as a dopant of the light emitting layer.
Abstract:
A multi-functional cyclic siloxane compound (A), a siloxane-based (co)polymer prepared from the compound (A), or compound (A) and at least one of a Si monomer having organic bridges(B), an acyclic alkoxy silane monomer(C), and a linear siloxane monomer (D); and a process for preparing a dielectric film using the polymer. The siloxane compound of the present invention is highly reactive, so the polymer prepared from the compound is excellent in mechanical properties, thermal stability and crack resistance, and has a low dielectric constant resulting from compatibility with conventional pore-generating materials. Furthermore, a low content of carbon and high content of SiO2 enhance its applicability to the process of producing a semiconductor, wherein it finds great use as a dielectric film.
Abstract:
Red phosphorescene compounds and organic electro-luminescence device using the same are disclosed. In an organic electroluminescence device including an anode, a hole injecting layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injecting layer, and a cathode serially deposited on one another, the organic electroluminescence device may use a compound as a dopant of the light emitting layer.
Abstract:
Disclosed is a method of preparing sustained release microspheres by spray-drying liquids with different compositions for preparation the sustained release microspheres through an ultrasonic dual-feed nozzle. Unlike conventional methods of preparing sustained release microspheres by spray-drying a single liquid containing a biodegradable polymer, a drug, an additive and a solvent through a single-feed nozzle, the present method is characterized by simultaneously spray-drying two liquids with different compositions for preparation of the sustained release microspheres respectively through internal and external channels of an ultrasonic dual-feed nozzle to coat sprayed droplets through the internal channel with other sprayed droplets through the external channel. The present method is effective in achieving a low initial release and a desired continuous release.
Abstract:
Non-activated tissue-regeneration polypeptides (TRPs) and their preparation methods are disclosed. The TRPs include: a protein transduction domain (PTD) making the polypeptides to permeate a cell membrane without cell membrane receptors; a furin activation domain (FAD) which has at least one proprotein convertase cleavage site and which can be cleaved by the proprotein convertase and activate a tissue regeneration domain (TRD) in cells; and a tissue regeneration domain (TRD) which can be activated by the proprotein convertase cleavage of the FAD to stimulate the growth or formation of tissues or to induce the regeneration of tissues. The TRPs can be mass-produced by cultured bacteria, such as recombinant E. coli, are in a non-activated state before in vivo administration, and their separation, purification, handling, storage and administration are simple and convenient. The in vivo administration of the TRPs is useful to stimulate the formation or regeneration of tissues, such as bones or cartilages, or to improve the fibrosis and cirrhosis of organs, such as kidneys, liver, lungs and heart by pharmacological mechanisms completely different from those of prior rhBMPs or TGF-β proteins.
Abstract:
Non-activated tissue-regeneration polypeptides (TRPs) and the preparation methods thereof are disclosed. The TRPs contain: a protein transduction domain (PTD) making the polypeptides to permeate a cell membrane without cell membrane receptors; a furin activation domain (FAD) which has at least one proprotein convertase cleavage site and which can be cleaved by the proprotein convertase and activate a tissue regeneration domain (TRD) in cells; and a tissue regeneration domain (TRD) which can be activated by the proprotein convertase cleavage of the FAD to stimulate the growth or formation of tissues or to induce the regeneration of tissues. The TRPs can be practically mass-produced by the culture of bacteria, such as recombinant E. coli, and are in a non-activated state before in vivo administration. Thus, their production cost is only a few tenths of the prior active proteins having uses similar thereto, and processes for their separation, purification, handling, storage and administration are significantly simple and convenient. The in vivo administration of the TRPs can stimulate the formation or regeneration of tissues, such as bones or cartilages, or improve the fibrosis and cirrhosis of organs, such as kidneys, liver, lungs and heart by pharmacological mechanisims completely different from those of prior rhBMPs or TGF-β proteins. Accordingly, the TRPs will be useful as drugs having new mechanisms.
Abstract:
Embodiments for providing a plurality of 3-dimensional ultrasound images by using a plurality of volume slices in an ultrasound system are disclosed. The ultrasound system comprises: an ultrasound data acquisition unit configured to transmit and receive ultrasound signals to and from a target object to acquire ultrasound data; a volume data forming unit configured to form volume data by using the ultrasound data; a user input unit for allowing a user to input a user instruction; and a processing unit configured to set a plurality of volume slice regions having different widths in the volume data in response to the user instruction and form a plurality of 3-dimensional ultrasound images by using volume slices defined by the volume slice regions.
Abstract:
Embodiments for providing an ultrasound spatial compound image are disclosed. In one embodiment, by way of non-limiting example, an ultrasound system comprises: an ultrasound data acquisition unit configured to transmit and receive ultrasound signals to and from a target object to output first ultrasound data and a plurality of sets of second ultrasound data corresponding to a region of interest (ROI); a user input unit configured to receive input information for defining the ROI; and a processing unit in communication with the ultrasound data acquisition unit and the user input unit, the processing unit being configured to form volume data based on the plurality of sets of second ultrasound data, compare the first ultrasound data with the volume data to detect geometric information therein, form a two-dimensional (2D) ultrasound image based on the first ultrasound data, and a first three-dimensional (3D) ultrasound image and a second 3D ultrasound data based on the volume data in consideration of the geometric information, and perform a spatial compound upon the 2D ultrasound image, the first 3D ultrasound image and the second 3D ultrasound image based on the geometric information to form an ultrasound spatial compound image.
Abstract:
The tactile transmission device includes a plurality of cells arranged at regular intervals, each having a storage space therein. A contact member is installed in each of the cells, an upper portion of the contact member protruding out of the cell. An elastic member is installed in each of the cells, and biases the contact member upwards. A sensor is installed in each of the cells, and measures displacement of the contact member. A magneto-rheological fluid is contained in each of the cells. A coil is installed in each of the cells and generates a magnetic field in the cell. A control means compares a shape information value of the image with a displacement value of the contact member output from the sensor, thus controlling a quantity of current applied to the coil. According to the present invention, the shape information of an image displayed on a screen is corrected to be suitable for a user's characteristics, thus more precisely transmitting the shape information on the screen to the user. Further, a transmission medium for transmitting a tactile sensation to a user has a simple construction, so that miniaturization of the tactile transmission device is very easily realized.