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81.
Jarkko Routama Kimmo Koli Pasi Ruhanen Kari Halonen 《Analog Integrated Circuits and Signal Processing》1999,19(1):59-74
In this paper a single chip transmitter and receiver interface circuit for 160 Mbit/s CMI-coded data transmission is presented. The receiver circuit includes a 12 dB cable equalizer to compensate for nonconstant cable attenuations. There is also a PFLL for data regeneration and to extract a 320 MHz oscillator clock signal. The frequency characteristics of the equalizer are controlled with an automatic gain control loop (AGC). The PFLL is a combination of two separate control loops, the purpose of which is to keep the integrated oscillator on the narrow locking range of the data loop. The frequency loop has been designed with a frequency detector to avoid interferences between the two control loops. The transmitter includes a cable driver supplying a stable 1 Vpp signal amplitude to the transmission line and also a PLL to extract a 320 MHz clock signal. 相似文献
82.
Tero Tikka Jussi Ryynänen Kari Halonen 《Analog Integrated Circuits and Signal Processing》2008,54(2):105-111
This paper focuses on the design and measurements of low-noise amplifiers (LNA) targeted for WCDMA base-station applications. In addition, various gain control techniques and the accuracy in noise measurements have been analyzed. Two different LNA designs are presented. Both LNAs can be operated in two gain modes, which are optimized for different base-station configurations. Both designs are implemented using the same 0.25-μm SiGe BiCMOS process, and both designs achieve the NF of 1 dB and IIP3 of ?5 dBm in high gain mode. 相似文献
83.
Scalable Parallel Memory Architectures for Video Coding 总被引:1,自引:0,他引:1
Current video compression standards, which process frames macroblock by macroblock, employ several processing functions to achieve the compression. These functions refer to data memory address space in different ways. E.g., performing motion estimation and motion compensation functions requires many times data accesses unaligned to word boundaries. On the other hand, Discrete Cosine Transformation (DCT) and inverse of it (IDCT) for 8 × 8 block can be performed first for rows and then for columns. Thus, transposition is needed between these two stages. Among other things, parallel memory architecture can provide a solution for these tasks. In our other paper, we shortly surveyed parallel memory architectures and proposed parallel memory architecture designs for different data path widths for video coding applications. In this paper, we construct video coding function examples by using the proposed parallel data memory efficiently. Furthermore, performance and implementation cost of the parallel memory architecture are estimated and compared to more conventional memory architectures. The examples are given for different data bus widths (16, 32, 64, and 128 bits). We show that the parallel memory can keep the data path fully utilized in many video coding function implementations. This ensures high-speed operation and full utilization of the processing resources. 相似文献
84.
Milena Stepien Jarkko J Saarinen Hannu Teisala Mikko Tuominen Janne Haapanen Jyrki M M?kel? Jurkka Kuusipalo Martti Toivakka 《Nanoscale research letters》2013,8(1):444
Compressibility of liquid flame spray-deposited porous TiO2 nanoparticle coating was studied on paperboard samples using a traditional calendering technique in which the paperboard is compressed between a metal and polymer roll. Surface superhydrophobicity is lost due to a smoothening effect when the number of successive calendering cycles is increased. Field emission scanning electron microscope surface and cross‒sectional images support the atomic force microscope roughness analysis that shows a significant compressibility of the deposited TiO2 nanoparticle coating with decrease in the surface roughness and nanoscale porosity under external pressure.
PACS
61.46.-w; 68.08.Bc; 81.07.-b 相似文献85.
Multibody System Dynamics - The development of machinery often requires system-level analysis, in which non-mechanical subsystems, such as hydraulics, need to be considered. Co-simulation allows... 相似文献
86.
Dinesh Bharti Manisha Tikka Sang-Yun Lee Eun-Yeong Bok Hyeon-Jeong Lee Gyu-Jin Rho 《International journal of molecular sciences》2021,22(4)
In the present era, infertility is one of the major issues which restricts many couples to have their own children. Infertility is the inability to achieve a clinical pregnancy after regular unprotected sexual intercourse for the period of one year or more. Various factors including defective male or female germ cell development, unhealthy and improper lifestyles, diseases like cancer and associated chemo-or-radiation therapies, congenital disorders, etc., may be responsible for infertility. Therefore, it is highly important to understand the basic concepts of germ cell development including primordial germ cell (PGC) formation, specification, migration, entry to genital ridges and their molecular mechanisms, activated pathways, paracrine and autocrine signaling, along with possible alteration which can hamper germ cell development and can cause adversities like cancer progression and infertility. Knowing all these aspects in a proper way can be very much helpful in improving our understanding about gametogenesis and finding possible ways to cure related disorders. Here in this review, various aspects of gametogenesis especially female gametes and relevant factors causing functional impairment have been thoroughly discussed. 相似文献
87.
Pertti Trml Heta-Maija Mikkola Jarkko Vasenius Seppo Vainionp Pentti Rokkanen 《大分子材料与工程》1991,185(1):293-302
Absorbable polyglycolide suture fibers were sintered with the compression molding techniques to cylindrical rods at temperatures between 205°C and 232°C for 3–5 min with final pressures of 50–80 N/mm2. The cylindrical rods had nominal diameters between 1.5–4.5 mm and a length of 50 mm. The initial bending moduli and the initial bending strengths of the rods were between 9–15 GPa and 220–430 MPa, respectively. The shear strengths of the rods were between 165–255 MPa. The hydrolytic loss of mechanical strength of the above self-reinforced, absorabable polyglycolide rods were studied in phosphate buffer at 37°C and 77°C. It was found that the rate of strength loss decreases with the increasing diameter of the rods. On the other hand, the rate of strength loss increases when the temperature of the buffer solution is raised. The strength, retention time at 37°C was between 7–10 weeks showing that the loss of mechanical strength of self-reinforced polyglycolide rods occurs more rapidly in vivo than in vitro. 相似文献
88.
Jarkko Vartiainen Albert Sadovnikov Joni-Kristian Kamarainen Lasse Lensu Heikki Kälviäinen 《Machine Vision and Applications》2008,19(4):249-259
Regular patterns, as defined in this study, are found in areas of industry and science, for example, halftone raster patterns used in the printing industry and crystal lattice structures in solid state physics. The need for quality inspection of products containing regular patterns has aroused interest in the application of machine vision for automatic inspection. Quality inspection typically corresponds to detecting abnormalities, defined as irregularities in this case. In this study, the problem of irregularity detection is described in analytical form and three different detection methods are proposed. All the methods are based on characteristics of the Fourier transform to compactly represent regular information. The Fourier transform enables the separation of regular and irregular parts of an input image. The three methods presented are shown to differ in their generality and computational complexities. 相似文献
89.
Jarkko Kaleva Petri Komulainen Markku Juntti Antti Tölli 《Wireless Personal Communications》2013,71(3):1649-1662
In this work, the effect of the multipath on the capacity and the interference statistics of the sectors of the highways cigar-shaped W-CDMA microcells is studied. A model of five microcells is used to analyze the uplink. The capacity and the interference statistics of the microcell are studied for different antenna sidelobe levels and different sector ranges. In the study, imperfect power control and limited transmitted power are assumed. Users are assumed to be within equally spaced buses and cars. The uplink capacity of the sector is studied assuming three types of services, namely, voice, 3G data and 3.75G data (representing the High Speed Uplink Packet Access). It is shown that, the sector uplink capacity depends on the buses and cars density within the sector. The capacity is also given as a function of the number of buses and cars within the sector. 相似文献
90.
We define two measures of “fractalness” of gray-tone images: the degree of self-similarity and the gray-tone fractal dimension
as a generalization of Minkovski dimension of compact sets. We show how to compute both these measures from the WFA-representation
of a gray-tone image. Since we have developed a WFA-inference algorithm which computes a good approximation of any gray-tone
image we can compute a close approximation of both our measures of fractalness for any gray-tone image.
Received: 15 November 1994 / 6 October 1995 相似文献