NEC

About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.

Tuning ranges for 1.5 μm wavelength tunable DBR lasers

Abstract: Tuning ranges for 1.5 mu m wavelength tunable distributed Bragg reflector (DBR) lasers were studied experimentally. Over 10.0 nm (1.25 THz) quasicontinuous tuning under 5 mW light output conditions and 4.4 nm (550 GHz) continuous tuning at 1 mW were achieved.

An UPC-based traffic control framework for ATM networks

Abstract: Future broadband networks have to support new bandwidth intensive applications that will place stringent requirements on the network in terms of the QOS (quality of service) they receive. In spite of the the promise of abundant bandwidth, ATM would not be able to support such services unless adequate control is exercised within the network. In this paper, we propose a traffic control framework for ATM, that would provide guarantees on QOS for these new applications. Central to this framework is a traffic classification scheme that maps applications to specific traffic classes based on their QOS requirements and the statistical characteristics of their traffic, and a set of controls layered in time based on the time constant of events they control. The proposed traffic control framework can work across LANs, MANs, WANs, private and public networks in a seamless manner. The controls are designed to scale with distance, traffic volume and traffic type. A notable feature of this framework is that it depends on a minimum set of control functions to handle a wide range of traffic types. Further, it uses parameters for control that have already been standardized by ITU and the ATM Forum.

Magnetic random access memory

Abstract: MRAM includes a first wiring, a second wiring, and a memory cell. The first wiring extends to a first direction, and the second wiring extends to a second direction. The memory cell includes a free magnetic layer in which a plurality of magnetic layers coupled anti-ferromagnetically through non-magnetic layers are laminated, and is provided at an intersection of the first and second wirings. The magnetization direction of the free magnetic layer is different from the first and second directions. The writing method includes (a) reading a first data stored in the memory cell; (b) comparing a second data to be written to the memory cell and the first data; and (c) changing a direction of a first write current supplied to the first wiring and a direction of the second write current to be supplied to the second wiring, when the first data and second data are different.

Best-cell amendment method for amending hysteresis margin according to the degree of congestion

Abstract: A best-cell amendment method is disclosed for amending hysteresis margins according to the degree of congestion. A radio network controller (RNC) compares the average value P(k) of transmission power of a downlink shared channel PDSCH of cell k and a first threshold value P_threshold1 to measure the degree of congestion. If the RNC determines that the degree of congestion in cell k is high, it sets a small hysteresis margin hm_a, and if RNC determines that the degree of congestion in cell k is low, it sets a large hysteresis margin hm_b.