There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Data Mining Practical Machine Learning Tools and Techniques

XI. STRATEGIES FOR IMPROVING DIABETES CARE D iabetes is a chronic illness that requires continuing medical care and patient self-management education to prevent acute complications and to reduce the risk of long-term complications. Diabetes care is complex and requires that many issues, beyond glycemic control, be addressed. A large body of evidence exists that supports a range of interventions to improve diabetes outcomes. These standards of care are intended to provide clinicians, patients, researchers, payors, and other interested individuals with the components of diabetes care, treatment goals, and tools to evaluate the quality of care. While individual preferences, comorbidities, and other patient factors may require modification of goals, targets that are desirable for most patients with diabetes are provided. These standards are not intended to preclude more extensive evaluation and management of the patient by other specialists as needed. For more detailed information, refer to Bode (Ed.): Medical Management of Type 1 Diabetes (1), Burant (Ed): Medical Management of Type 2 Diabetes (2), and Klingensmith (Ed): Intensive Diabetes Management (3). The recommendations included are diagnostic and therapeutic actions that are known or believed to favorably affect health outcomes of patients with diabetes. A grading system (Table 1), developed by the American Diabetes Association (ADA) and modeled after existing methods, was utilized to clarify and codify the evidence that forms the basis for the recommendations. The level of evidence that supports each recommendation is listed after each recommendation using the letters A, B, C, or E.

Standards of Medical Care in Diabetes

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Table Of Integrals Series And Products

It is shown that, particularly for terrestrial cellular telephony, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques. A single-cell system, such as a hubbed satellite network, is addressed, and the basic expression for capacity is developed. The corresponding expressions for a multiple-cell system are derived. and the distribution on the number of users supportable per cell is determined. It is concluded that properly augmented and power-controlled multiple-cell CDMA promises a quantum increase in current cellular capacity. >

On the capacity of a cellular CDMA system

IEEE 802.15.3 is designed for high data rates multimedia applications in Wireless Personal Area Network (WPAN). The piconet is the basic topology of IEEE 802.15.3, which consists of a number of independent devices and a Piconet Coordinator (PNC). Medium Access Control (MAC) protocol plays a vital role in determining the energy consumption of all devices within a piconet. IEEE 802.15.3 MAC adapts a hybrid approach, i.e., a combination of CSMA/CA and TDMA, in order to support real-time communication while maintaining the desired Quality of Service (QoS). The channel is bounded by superframe structures where each superframe consists of a beacon, a Contention Access Period (CAP), and a Channel Time Allocation Period (CTAP). In this paper, we focus on the CAP part of the superframe. Numerical approximations are derived to analyze the performance of CSMA/CA used in CAP in terms of probability of successful transmission, average number of collisions, and normalized throughput. Numerical results are validated by extensive simulations using NS-2 simulator.

CAP Analysis of IEEE 802.15.3 MAC Protocol

Fixed guard times considered for the physical layer of the IEEE 802.15.4a standard (low-rate Wireless Personal Area Networks) cause user asynchronism-dependent collisions that affect the instantaneous bit-error-rate (BER) and packet- error-rate (PER) performances in the presence of simultaneously operating piconets (SOPs). Using code shift keying (CSK), the location of the guard times can be randomized yielding the collision event independent of user asynchronism. In this paper, CSK modulation is adopted for the physical layer of the IEEE 802.15.4a standard with a special code design technique, and it is shown that the proposed implementation of CSK stabilizes the instantaneous BER and PER values. Stabilizing the instantaneous BER and PER values prevents worst-case scenarios, where many packets may be lost due to user asynchronism-dependent collisions, and should be carefully considered for real system implementation.

WLC23-1: Code Shift Keying Modulation For Low-Rate UWB Communications Under Dense Multipath

In this paper, a binary power allocation scheme is proposed for dense cognitive networks with plentiful secondary nodes. During the power allocation, the capacity loss of the primary system is controlled to be lower than a predefined level; and the capacity of the secondary system is ensured to some extent. Most importantly, based on the theoretical derivations, the power allocation is proved to be executable distributedly by local decisions at each secondary node, which is especially suitable for cognitive networks. By the simulation, the restriction on the distance between the secondary sender and the primary receiver is achieved straightforwardly, which reflects that the capacity of both primary system and secondary system can be ensured to the predefined level if the distance between secondary senders and the primary receiver satisfies certain conditions.

Distributed power allocation in dense cognitive networks: Primary receiver detectable case

Decentralized estimation methods which using Wireless Sensor Networks (WSN) with a bandwidth constraint of 1-bit on communication channel were proposed in some literatures. As the data generated are very scarce, to this type of WSNs, the PHY, MAC and Network layer protocols should be carefully designed to avoid excessive overhead, especially when energy saving is a major concern. In this letter we propose a cross layer design for such 1-bit WSNs. It has 3 features: 1, the sensor nodes send their results one by one after receiving a polling signal in a periodically rendezvous time window; 2, if the sensor node detect '0' it need not to send any signal; 3, Detect-and-Forward is performed on some in-between sensor nodes to relay messages from far lying sensor nodes through a minimum-hop-number path to the fusion center. The architecture and protocols are described, and simulations are made to illustrate the energy saving benefits of 1-bit Detect-and-Forward relaying.

1-Bit Decentralized Wireless Sensor Networks: Cross Layer Design of Architecture and Data Acquiring Protocol

In this paper, based on the Alamouti space time block codes (STBC) and direct-sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system, we investigate the STBC based DS-BPAM UWB system over IEEE UWB multipath fading channels. In order to make the benefits of multipath channels, SRake receiver is applied in this paper. Theoretical bit error probability of the STBC based multi-antenna DS-BPAM UWB system is derived and signal processing algorithm is provided. The system performance of the STBC based DS-BPAM UWB system is evaluated through both SRake receiver and conventional coherent receiver. The results show the efficiency of the STBC based DS-BPAM UWB system with SRake receiver over multipath fading channels.

STBC based DS-BPAM UWB communication system

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