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    • 1. 发明授权
    • Norbornene polymer and production process
    • 降冰片烯聚合物和生产工艺
    • US06525144B1
    • 2003-02-25
    • US09485899
    • 2000-05-05
    • Naoki TanahashiHidehiro ItoToshihide Murakami
    • Naoki TanahashiHidehiro ItoToshihide Murakami
    • C08F804
    • C08G61/08C08F8/04C08F232/08C08F132/08
    • A norbornene polymer comprising a repeating unit derived from a norbornene monomer having a cyclic hydrocarbon structure (I) derived from the norbornene ring which constitutes at least a part of the main chain, another cyclic hydrocarbon structure (II), which shares one carbon-carbon bond with the cyclic hydrocarbon structure (I) and has 4 to 6 carbon atoms, and a monocyclic or polycyclic hydrocarbon structure (III), which shares one carbon-carbon bond with the cyclic hydrocarbon structure (II), in a proportion of 20 to 100 mol % based on the whole repeating unit of the polymer, wherein the number average molecular weight is within a range of 1,000 to 1,000,000, and a peak area (A) on a high magnetic field side and a peak area (B) on a low magnetic field side in methylene peaks derived from the methylene groups in the cyclic hydrocarbon structure (III) in a 13C-NMR spectrum as determined in heavy chloroform (TMS standard) satisfy a relationship of the expression: B/(A+B)≦0.30 and a production process thereof.
    • 一种降冰片烯聚合物,其包含衍生自构成至少一部分主链的降冰片烯环的环状烃结构(I)的降冰片烯单体的重复单元,另外一个碳碳结构(II) 与环状烃结构(I)键合并具有4至6个碳原子,并且与环状烃结构(II)共享一个碳 - 碳键的单环或多环烃结构(III)以20至 基于聚合物的整个重复单元为100摩尔%,其中数均分子量在1,000至1,000,000的范围内,高磁场侧的峰面积(A)和峰面积(B)在 在重氯仿(TMS标准)中测定的13 C-NMR光谱中,环状烃结构(III)中的亚甲基衍生的亚甲基峰的低磁场侧满足以下关系:表达式与生产过程 s。
    • 5. 发明授权
    • Forward and inverse discrete cosine transform circuits
    • 正向和反向离散余弦变换电路
    • US5748514A
    • 1998-05-05
    • US564480
    • 1995-11-29
    • Shigeyuki OkadaNaoki TanahashiHayato Nakashima
    • Shigeyuki OkadaNaoki TanahashiHayato Nakashima
    • H04N19/60G06F17/14G06T9/00H04N1/41H04N19/42H04N19/423H04N19/436H04N19/625H04N19/85H04N19/91
    • G06F17/147G06T9/007
    • Discrete cosine transform circuits suitable for inverse discrete cosine transform (IDCT) or forward discrete cosine transform (FDCT) are disclosed. An IDCT circuit includes a group of multipliers and a group of adders/subtracters. The multipliers receive plural pieces of input data which are externally supplied in parallel. Each multiplier has a cosine constant to multiply to the received input data. The adders/subtracters receive multiplication results from the multipliers and perform addition/subtraction thereon to produce output data, which is the result of inverse discrete cosine transform of the input data. An FDCT circuit includes a group of input-stage adders/subtracters, a group of multipliers, and a group of output-stage adders. The input-stage adders/subtracters perform addition/subtraction on input data which are externally supplied in parallel. Computation results of the input-stage adders/subtracters is supplied to the multipliers. The output-stage adders receive multiplication results from the multipliers and produce output data, which is the result of forward discrete cosine transform of the input data. The discrete cosine transform circuits are particularly suitable for use in MPEG video encoders/decoders.
    • 公开了适用于逆离散余弦变换(IDCT)或前向离散余弦变换(FDCT)的离散余弦变换电路。 IDCT电路包括一组乘法器和一组加法器/减法器。 乘法器接收外部并行提供的多个输入数据。 每个乘法器具有乘法常数以乘以接收到的输入数据。 加法器/减法器从乘法器接收乘法结果,并在其上执行加法/减法以产生输出数据,这是输入数据的反离散余弦变换的结果。 FDCT电路包括一组输入级加法器/减法器,一组乘法器和一组输出级加法器。 输入级加法器/减法器对外部并行提供的输入数据执行加法/减法。 输入级加法器/减法器的计算结果提供给乘法器。 输出级加法器从乘法器接收乘法结果并产生输出数据,这是输入数据的前向离散余弦变换的结果。 离散余弦变换电路特别适用于MPEG视频编码器/解码器。