摘要:
Disclosed is a rubber composition obtained by chemically blending rubber with a filler, particularly in which Latex rubber is directly blended with a starch solution obtained by gelatinizing starch in water. Herein, as a coupling agent between Latex rubber and starch, resorcinol-formaldehyde is used. By this, a vulcanized rubber compound is prepared. When resorcinol-formaldehyde is used as a coupling agent during the blending of the Latex rubber with the gelatinized starch solution, it is possible to solve the problem of tensile strength lowering caused by low affinity with rubber. Furthermore, it is possible to inhibit starch loss caused by high water-solubility, during the blending of starch in a liquid state. Also, the physical property of the vulcanized rubber compound can be varied according to the amount of the added coupling agent.
摘要:
An inverter-driven resistor-ladder digital-to-analog (DAC) converter includes a resistor-ladder network that comprises a resistor for each bit signal of a multi-bit input signal. Each resistor of the resistor-ladder network comprises an input end and an output end. The input end of each resistor is coupled to a corresponding bit signal of the multi-bit input signal, and the output end of each resistor is coupled to an output node of the resistor-ladder network. An output voltage is generated at the output node that is based on the multi-bit input signal. In one exemplary embodiment, the multi-bit input signal is a sigma-delta (ΣΔ) modulated multi-bit input signal. In another exemplary embodiment, resistance values of the resistors of the resistor-ladder network are related by a binary weighting. In still another exemplary embodiment, resistance values of the resistors of the resistor-ladder network are substantially equal.
摘要:
A semiconductor memory device includes a memory string coupled to a bit line, a page buffer configured to sense a sensing current of the bit line in an erase verification operation or a program verification operation, and a sensing control circuit configured to differently set a level of the sensing current in the erase verification operation and the program verification operation in order to sense the threshold voltage level of a selected memory cell of the memory string.
摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed are described. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
The invention relates to recombinant plasmid pDSBCm harboring the gene vapk-repeated region, which gene encodes alkalic protease VapK, a microorganism Vibrio metschnikovii transformed therewith, and method for producing an alkaline protease VapK using the same microorganism.
摘要:
A method of erasing and programming a flash memory device including multi-level cells (MLCs). MLCs of a word line are selected and some of the MLCs are pre-programmed based on whether their individual threshold voltages are included in a first voltage range. The selected MLCs are pre-programmed with a pre-program (first) voltage; and the remaining MLCs are prohibited from pre-programming; then the remaining MLCs connected to the selected word line are programmed by applying a program (second) voltage that gradually rises from the pre-program voltage at a ratio of a step voltage n for the selected line.
摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
The present invention relates to bacteria which specifically target infarcted tissue and use thereof. The present invention provides a selective infarcted tissue-targeting bacterium for the first time, and can be used in selectively delivering drugs to the infarcted tissue or in selectively imaging the infarcted tissue. The infarcted tissue-targeting bacterium of the present invention can finish treatments by using antibiotics, and therefore, have remarkable advantages as compared to gene therapy using recombinant viruses. The infarcted tissue-targeting bacterium of the present invention have a significantly high affinity and specificity to infarcted myocardium or infarcted brain, thereby significantly reducing undesired transfections in the organs or tissues other than the heart. The gene expression by the infarcted tissue-targeting bacterium of the present invention in infarcted myocardium or infarcted brain is remotely controllable.
摘要:
An inverter-driven resistor-ladder digital-to-analog (DAC) converter includes a resistor-ladder network that comprises a resistor for each bit signal of a multi-bit input signal. Each resistor of the resistor-ladder network comprises an input end and an output end. The input end of each resistor is coupled to a corresponding bit signal of the multi-bit input signal, and the output end of each resistor is coupled to an output node of the resistor-ladder network. An output voltage is generated at the output node that is based on the multi-bit input signal. In one exemplary embodiment, the multi-bit input signal is a sigma-delta (ΣΔ) modulated multi-bit input signal. In another exemplary embodiment, resistance values of the resistors of the resistor-ladder network are related by a binary weighting. In still another exemplary embodiment, resistance values of the resistors of the resistor-ladder network are substantially equal.
摘要:
A semiconductor memory device includes a plurality of memory blocks configured to include memory cells, a voltage supply circuit configured to supply an erase voltage for an erase operation of a memory block selected from the memory blocks and supply an erase verify voltage and an erase pass voltage for an erase verify operation of the memory block selected from the memory blocks, and a control logic configured to group word lines per specific word lines, when the erase verify operation for the selected memory block is performed, and control the voltage supply circuit so that one or more of the erase verify voltage and the erase pass voltage rise whenever the erase verify operation is performed.