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    • 25. 发明申请
    • Method of packaging broadcast contents
    • 打包播放内容的方法
    • US20060235797A1
    • 2006-10-19
    • US11402981
    • 2006-04-13
    • Sun-nam LeeMyung-sun KimSung-hyu HanYoung-sun YoonJae-heung LeeBong-seon KimMoon-young Choi
    • Sun-nam LeeMyung-sun KimSung-hyu HanYoung-sun YoonJae-heung LeeBong-seon KimMoon-young Choi
    • G06Q99/00
    • G06Q30/02
    • A method of packaging broadcast contents are provided. The method includes: extracting a copy control bit from input broadcast contents and determining whether the broadcast contents will be stored after being encrypted based on the extracted copy control bit; creating usage rule information which includes an encryption method of the broadcast contents if it is determined that the broadcast contents will be stored after being encrypted; extracting the copy control bit from each new broadcast content sequentially input and detecting broadcast contents which include copy control bits indicating that the broadcast contents will be stored without being encrypted; and encrypting the input broadcast contents through the broadcast contents before the detected broadcast contents using the encryption method and packaging and storing the encrypted broadcast contents and the usage rule information. Therefore, the unauthorized copying of broadcast contents transmitted through a digital broadcast receiver can be prevented.
    • 提供一种封装广播内容的方法。 该方法包括:从输入广播内容中提取复制控制位,并根据所提取的复制控制位确定是否在加密之后存储广播内容; 创建使用规则信息,如果确定在加密之后将存储广播内容,则包括广播内容的加密方法; 从每个新的广播内容中提取复制控制位,顺序地输入和检测包括指示广播内容将不被加密的复制控制位的广播内容; 并且通过使用加密方法的检测到的广播内容之前的广播内容来加密输入的广播内容,并且包装和存储加密的广播内容和使用规则信息。 因此,可以防止通过数字广播接收机发送的广播内容的未经授权的复制。
    • 29. 发明授权
    • Preparation of polyimide foam
    • 聚酰亚胺泡沫的制备
    • US06172127B2
    • 2001-01-09
    • US09151735
    • 1998-09-11
    • Kil Yeong ChoiJae Heung LeeSung Goo LeeMi Hie YiSeung Su Kim
    • Kil Yeong ChoiJae Heung LeeSung Goo LeeMi Hie YiSeung Su Kim
    • C08J902
    • C08J9/02C08G73/1021C08G73/1028C08J9/28C08J2379/08
    • The invention herein relates to a process of preparing a novel polyimide foam having superior heat-resistance, flame retardancy, homogeneous size and distribution of cells, and low density, wherein a polyimide precursor in a granular form is prepared by means of using heterocyclic amine as catalyst and then foaming. According to the present invention, the preparing process of a polyimide foam comprises reacting aromatic carboxylic acid or the anhydrides thereof with an excess of aliphatic univalent alcohol to yield an aromatic ester solution. To the aromatic ester solution, divalent amines or the mixture thereof were added in the equivalent amount of said carboxylic acid or the anhydrides thereof in addition to a catalyst and surfactant to yield a polyimide. Then, the precursor in a granular form mixture was imidized while foaming by means of pre-heating and then heating in a microwave oven, after which was cured at a high temperature. Consequently, the present invention has the effect of providing a preparing process for a polyimide foam with superior heat-resistance and heat-insulating property, which can be widely used as substrate in aerospace, submarine, special ship, and high-speed train.
    • 本发明涉及一种制备具有优异的耐热性,阻燃性,均匀尺寸和细胞分布以及低密度的新型聚酰亚胺泡沫的方法,其中通过使用杂环胺作为颗粒形式制备颗粒形式的聚酰亚胺前体 催化剂,然后发泡。根据本发明,聚酰亚胺泡沫的制备方法包括使芳族羧酸或其酸酐与过量的脂肪族单价醇反应,得到芳族酯溶液。 除了催化剂和表面活性剂之外,向芳族酯溶液中加入等量的所述羧酸或其酸酐的二价胺或其混合物以产生聚酰亚胺。 然后,将颗粒状混合物中的前体通过预热加热发泡,然后在微波炉中加热,然后在高温下固化。因此,本发明具有提供制备方法 具有优异的耐热性和隔热性的聚酰亚胺泡沫,可广泛用作航空航天,潜艇,专用船和高速列车的基板。