Abstract: Acetylated cellulose ether and an article including the same. The acetylated cellulose ether has a degree of substitution (DS) of alkyl group of 1 to 2, a molar substitution (MS) of hydroxyalkyl group of 0 to 1, and a degree of substitution (DS) of acetyl group of 1 to 2.

Abstract: Disclose is a method and system enabling joint viewing of moving picture while chatting. In order to match the screen being played and chatting message, a method for synchronizing contents playing times for the contents being played is further disclosed. A room master client among user clients joined the joint viewing room receives buffering state information from all clients in joint viewing and transmits playback start message to the clients in joint viewing according to the buffering state information. After contents playback is started, the room master client provides information on current contents playing time to the other user clients periodically, and the other clients synchronize contents playing times based on the current contents playing time of the room master client.

Abstract: Disclose is a method and system enabling joint viewing of moving picture while chatting. In order to match the screen being played and chatting message, a method for synchronizing contents playing times for the contents being played is further disclosed. A room master client among user clients joined the joint viewing room receives buffering state information from all clients in joint viewing and transmits playback start message to the clients in joint viewing according to the buffering state information. After contents playback is started, the room master client provides information on current contents playing time to the other user clients periodically, and the other clients synchronize contents playing times based on the current contents playing time of the room master client.

Abstract: An encryption method and apparatus thereof is disclosed. In one embodiment the method includes (a) receiving the content data via the network, (b) changing a sequence of the received content data according to a predetermined algorithm or randomly to store in a form of a cache file, (c) generating a decryption key including information of the changed sequence of the data, and (d) encrypting the decryption key according to a predetermined encryption system, wherein if a playback or transmission of the stored content is requested, the encrypted decryption key is decrypted and the corresponding data is extracted from the cache file according to the sequence information of the decryption key to be played back or transmitted. According to one embodiment of the invention, a user is unable to illegally use content data stored in his local client and content data stored in a local client can be quickly decrypted so as not to affect playback of the content data.

Abstract: Provided is a detector, a gas scrubber comprising the detector for identifying a residual lifetime of an absorbent material contained in a gas scrubber for purifying a harmful exhaust gas, and a method of identifying the residual lifetime of the absorbent material. The detector comprises a solid chemical material, the color of which changes when it comes in contact with the untreated exhaust gas due to loss of absorbing power of the absorbent material, a detection window containing the solid chemical material therein, therethrough the visual identification of the color change of the solid chemical material can be made, and connecting units placed on an upper and lower end of the detection window. The visual identification of the color change of the solid chemical material through the detection window enables the continuous and safe identification of the residual lifetime of the absorbent material and the replacement time, thereby increasing the reliability of the gas scrubber.

Abstract: A universal power converter for generating a regulated voltage, current or power with a large input voltage range. The power converter has a voltage boost function configured to boost the rectified input voltage and provide power factor correction. The power converter also includes a voltage chop function to chop the boosted voltage to form an AC voltage. The power converter further includes at least one relay in electrical communication with the AC voltage and a transformer. The primary winding has at least two inputs operative to selectively vary the voltage generated on a secondary winding thereof selected by the relay. Accordingly, the power converter can generate different voltages at the output based upon the position of the relay and the boosted voltage. The power converter provides maximum power operation at a wide output voltage range, maximizing the charging energy.

Abstract: A universal power converter for generating a regulated voltage, current or power with a large input voltage range. The power converter has a voltage boost function configured to boost the rectified input voltage and provide power factor correction. The power converter also includes a voltage chop function to chop the boosted voltage to form an AC voltage. The power converter further includes at least one relay in electrical communication with the AC voltage and a transformer. The primary winding has at least two inputs operative to selectively vary the voltage generated on a secondary winding thereof selected by the relay. Accordingly, the power converter can generate different voltages at the output based upon the position of the relay and the boosted voltage. The power converter provides maximum power operation at a wide output voltage range, maximizing the charging energy.