Patients who had a parastomal hernia were treated with laparoscopic hernioplasty using the center band type of the composite mesh.Case 1:39-year-old man who had an ileostomy for Crohn’s disease had ...torus and skin erosion around the ileostomy. CT scan revealed his parastomal hernia. He was treated with the laparoscopic hernioplasty using the center band type of composite mesh. The center band area coated with the collagen membrane was attached to the ileum and covered a 7cm × 5cm of orifice by the double crown method with 3cm of marginal overlap. The patient has been followed for a year without any recurrence.Case 2:63-year-old man who had received a total cystectomy and had an ileal conduit for his cystic cancer, had a torus around the ileal conduit. CT scan revealed his parastomal hernia. He was treated with laparoscopic hernioplasty using mesh which covered a 6cm × 5.5cm orifice using the double crown method with 3cm of marginal overlap. He has been followed for a half year without any recurrence.
Short-distance (<;10cm) wireless communications applications are rapidly expanding. For instance, a fast file transfer by "touch-and-proceed data communication" provides a user-friendly interface for ...electronic products 1,2. Wireless I/O's may replace conventional connectors on a PCB to overcome performance limitations 3,4. High-speed (>;Gb/s), low energy dissipation (<;100pJ/b), low bit-error-rate (BER<;10 -3 ), and low cost (small layout area in matured CMOS processes) are required as well as compliance with spectral regulation and EMI/EMS. None of the previous research achievements has satisfied all these requirements (Fig. 26.2.6). Non-coherent UWB transceivers are typically low speed and energy hungry; i.e. 15Mb/s with 2680pJ/b in a heterodyne transceiver 1 and 1Mb/s with 373pJ/b in a direct-conversion transceiver 3. Millimeter-Wave radio is often used to raise the data rate at the cost of increase in energy dissipation. A heterodyne non-coherent 60GHz transceiver performed 2.5Gb/s with 114pJ/b 2. To further reduce the energy dissipation a direct-conversion coherent 56GHz transceiver was developed in 40nm CMOS and 11Gb/s was achieved with 6.4pJ/b 4. Unfortunately, as a free-running TX LO and injection-lock carrier synchronization were employed, the injection locking range was very narrow. For an RF input power of -30dBm, the locking range was 60MHz, only 0.1% of the center frequency. Tight control of frequency under variation and noise is not easy for manufacturing. Raising the RF input power is also limited by the FCC spectral mask regulation. In this paper, we present a UWB direct-conversion coherent transceiver in 90nm CMOS. 2Gb/s with 75pJ/b is achieved while meeting the FCC regulation for indoor communications. An IQ-switching carrier recovery scheme is proposed to save layout area and energy dissipation by 43% and 20%, respectively, compared with those in the conventional Costas loop. The transceiver with the proposed carrier recovery scheme uses binary phase shift keying (BPSK) modulation.
We developed a trial model of a 1-kohm metal-foil resistor with a four-terminal-pair design. The resistance and phase angle of the resistor as a function of frequency were measured. Below a 2-kHz ...frequency, a slight quadratic change in the resistance was observed. The phase-angle results showed a linear change, and the time constant was estimated from the slope of the linear change.
AC characterization of a 1-kΩ metal-foil resistor Domae, Atsushi; Kumagai, Masaya; Zama, Matsuo ...
29th Conference on Precision Electromagnetic Measurements (CPEM 2014),
2014-Aug.
Conference Proceeding
We developed a trial model of a 1-kΩ metal-foil resistor with a four-terminal-pair design. The resistance and phase angle of the resistor as a function of frequency were measured. Below a 2-kHz ...frequency, a slight quadratic change in the resistance was observed. The phase-angle results showed a linear change, and the time constant was estimated from the slope of the linear change.
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