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    • 1. 发明授权
    • Combination-based broadcast encryption method
    • 基于组合的广播加密方式
    • US08897445B2
    • 2014-11-25
    • US13460098
    • 2012-04-30
    • Weon-il JinDae-youb KimHwan-joon KimSung-joon Park
    • Weon-il JinDae-youb KimHwan-joon KimSung-joon Park
    • H04L9/08G06F21/10
    • H04L9/0833G06F21/10H04L9/0822H04L2209/601
    • A combination-based broadcast encryption method includes: assigning by a server a base group of different combinations to each user; producing and sending secret information for each user by using as a base the base group allocated to each user; producing and sending an inverse-base parameter value through calculations with integers used to produce the base group and key value information of one or more privileged users; and deriving a group key by using the key value information of the privileged users, encrypting a session key by using the derived group key, and sending the encrypted session key to each user. Accordingly, each user is assigned a different base through a combination, thereby having security against collusion attacks.
    • 基于组合的广播加密方法包括:由服务器分配不同组合的基组给每个用户; 通过使用分配给每个用户的基本组作为基础来生成和发送每个用户的秘密信息; 通过用于产生基本组的整数和一个或多个特权用户的键值信息的计算产生和发送反基本参数值; 以及通过使用所述特权用户的密钥值信息来导出组密钥,通过使用导出的组密钥加密会话密钥,以及将加密的会话密钥发送给每个用户。 因此,通过组合为每个用户分配不同的基站,从而具有防止串通攻击的安全性。
    • 7. 发明授权
    • Ink-jet printhead and manufacturing method thereof
    • 喷墨打印头及其制造方法
    • US07758165B2
    • 2010-07-20
    • US12000579
    • 2007-12-13
    • Myung-song JungSung-joon ParkTae-kyun KimJae-sik Min
    • Myung-song JungSung-joon ParkTae-kyun KimJae-sik Min
    • B41J2/04
    • B41J2/1646B41J2/14B41J2/16B41J2/1623B41J2/1628B41J2/1629B41J2/1631B41J2/1642B41J2/1645B41J2002/14346
    • An ink-jet printhead and a manufacturing method thereof include a substrate on which a space portion is formed, a passage plate installed on the substrate in which an ink chamber is formed to store ink, a nozzle plate installed at a top surface of the passage plate in which a nozzle is formed to eject the ink, and a vibration plate disposed between the substrate and the passage plate to generate a pressure for ejecting the ink by changing a volume of the ink chamber. The vibration plate includes a base layer formed at a top surface of the substrate so as to cover at least a part of the space portion, a thin film shape memory alloy layer which contacts the ink contained in the ink chamber and varies according to a temperature variation, a heating element disposed between the base layer and the thin film shape memory alloy to generate heat, and an insulating layer disposed between the heating element and the thin film shape memory alloy layer and transfers the heat generated by the heating element to the thin film shape memory alloy layer. Due to a stable temperature coefficient of resistance (TCR) of the heating element, a height and a width of a voltage supplied to the heat element can be easily controlled, and thus power of the vibration plate can be precisely controlled, thereby having a predetermined image quality, and the heating element does not contact directly the ink, thereby realizing stability of the ink-jet printhead.
    • 喷墨打印头及其制造方法包括:基板,其上形成有空间部分,安装在基板上的通道板,其中形成有用于存储墨水的墨水室;喷嘴板,安装在通道的顶表面 其中形成有喷嘴以喷射墨水的板;以及设置在基板和通道板之间的振动板,以通过改变墨水室的体积产生用于喷射墨水的压力。 所述振动板包括形成在所述基板的顶面的基底层,以覆盖所述空间部分的至少一部分;薄膜形状记忆合金层,其与容纳在所述墨水室中的墨水接触并根据温度变化 设置在基底层和薄膜形状记忆合金之间以产生热量的加热元件,以及设置在加热元件和薄膜形状记忆合金层之间的绝缘层,并将由加热元件产生的热量传递到薄 薄膜形状记忆合金层。 由于加热元件的稳定的电阻温度系数(TCR),可以容易地控制供给到热元件的电压的高度和宽度,从而可以精确地控制振动板的功率,从而具有预定的 图像质量,并且加热元件不直接接触墨水,从而实现喷墨打印头的稳定性。