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    • 64. 发明授权
    • Radio communication apparatus and transmission antenna changing method
    • 无线电通信装置和发射天线改变方法
    • US06281840B1
    • 2001-08-28
    • US09426199
    • 1999-10-25
    • Kenichi MiyoshiTakayuki Suzuki
    • Kenichi MiyoshiTakayuki Suzuki
    • H04B706
    • H04B7/0608H04B17/318
    • Received signal strength detecting means 109 and 110 detect received signal strength of the antennas of the respective terminals. A transmission antenna selector 111 selects an antenna with a maximum received signal strength with respect to the respective communication destinations, and when there is a plurality of communication destinations having the same antenna with a maximum received signal strength, the transmission antenna selector selects transmission antennas to be different from each other based on the received signal strength of the antennas with the second largest received signal strength, and an internal switch of a transmission antenna change device 114 is changed based on the selection result. This eliminates the need for providing mixers without reducing transmission diversity effect, and results in a reduction of a maximum output of a transmission amplifier.
    • 接收信号强度检测装置109和110检测各个终端的天线的接收信号强度。 发送天线选择器111选择相对于各个通信目的地具有最大接收信号强度的天线,并且当存在具有最大接收信号强度的具有相同天线的多个通信目的地时,发送天线选择器选择发送天线 基于具有第二大接收信号强度的天线的接收信号强度彼此不同,并且发送天线改变装置114的内部开关根据选择结果而改变。 这消除了在不降低传输分集效应的情况下提供混频器的需要,并且导致传输放大器的最大输出的减小。
    • 69. 发明授权
    • Method for producing &agr;-hydroxy-&bgr;-aminocarboxylic acids
    • α-羟基-β-氨基羧酸的制备方法
    • US06169200A
    • 2001-01-02
    • US09186272
    • 1998-11-05
    • Takayuki SuzukiYutaka HondaKunisuke Izawa
    • Takayuki SuzukiYutaka HondaKunisuke Izawa
    • C07C31728
    • C07C323/29C07C317/28C07C327/30
    • The present invention provides a simple and inexpensive method for producing &agr;-hydroxy-&bgr;-aminocarboxylic acids and their esters. An ester of an N-protected &agr;-amino acid ester is converted into a &bgr;-ketosulfoxide, which is then processed with an acid to give an &agr;-ketohemimercaptal. Next, this is acylated and then processed with a base to obtain an N-protected &agr;-acyloxy-&bgr;-amino-thioester, which is then saponified to obtain an intended compound. According to the method of the present invention, it is possible to produce &agr;-hydroxy-&bgr;-aminocarboxylic acid derivatives, which are intermediates in producing various HIV protease inhibitors, renin inhibitors and carcinostatics, from a-amino acids. The method comprises reduced reaction steps, the selectivity in the method to give the intended product is high, and the yield of the product obtained is high.
    • 本发明提供了用于生产α-羟基-β-氨基羧酸及其酯的简单和便宜的方法。将N-保护的α-氨基酸酯的酯转化为β-氧亚砜,然后用酸处理 给予α-酮基咪唑。 接下来,将其进行酰化,然后用碱处理,得到N-保护的α-酰氧基-β-氨基 - 硫代酯,然后皂化,得到目的化合物。 根据本发明的方法,可以生产α-羟基-β-氨基羧酸衍生物,它们是从α-氨基酸生产各种HIV蛋白酶抑制剂,肾素抑制剂和制癌剂的中间体。 该方法包括减少反应步骤,得到所需产物的方法中的选择性高,所得产物的产率高。