35,172 research outputs found
Near-capacity iterative decoding of binary self-concatenated codes using soft decision demapping and 3-D EXIT charts
No full textIn this paper 3-D Extrinsic Information Transfer (EXIT) charts are used to design binary Self-Concatenated Convolutional Codes employing Iterative Decoding (SECCC-ID), exchanging extrinsic information with the soft-decision demapper to approach the channel capacity. Recursive Systematic Convolutional (RSC) codes are selected as constituent codes, an interleaver is used for randomising the extrinsic information exchange of the constituent codes, while a puncturer helps to increase the achievable bandwidth efficiency. The convergence behaviour of the decoder is analysed with the aid of bit-based 3-D EXIT charts, for accurately calculating the operating EbN0 threshold, especially when SP based soft demapper is employed. Finally, we propose an attractive system configuration, which is capable of operating within about 1 dB from the channel capacity
Near-capacity code design for entanglement-assisted classical communication over quantum depolarizing channels
No full textWe have conceived a near-capacity code design for entanglement-assisted classical communication over the quantum depolarizing channel. The proposed system relies on efficient near-capacity classical code designs for approaching the entanglement-assisted classical capacity of a quantum depolarizing channel. It incorporates an Irregular Convolutional Code (IRCC), a Unity Rate Code (URC) and a soft-decision aided Superdense Code (SD), which is hence referred to as an IRCC-URC-SD arrangement. Furthermore, the entanglement-assisted classical capacity of an N-qubit superdense code transmitted over a depolarizing channel is invoked for benchmarking. It is demonstrated that the proposed system operates within 0.4 dB of the achievable noise limit for both 2-qubit as well as 3-qubit SD schemes. More specifically, our design exhibits a deviation of only 0.062 and 0.031 classical bits per channel use from the corresponding 2-qubit and 3-qubit capacity limits, respectively. The proposed system is also benchmarked against the classical convolutional and turbo codes
Dypsis procera (soon to be D. longipes) (Cultivated)
No full textDypsis procera (soon to be D. longipes), colorful stem. Family Arecaceae, Subclass Arecidae. Origin: Cultivated
Kim Hwa Soon
No full text학위논문(석사)--아주대학교 일반대학원 :간호학과,2009. 2Ⅰ. 서론
A. 연구의 필요성 ----1
B. 연구목적 ---- ----3
C. 용어정의-------4
Ⅱ. 문헌고찰 ------5
Ⅲ. 연구방법
A. 연구설계 ----10
B. 연구대상 ----10
C. 연구도구 -----------10
D. 자료수집 방법 및 절차 -----------11
E. 윤리적 고려사항 ----------12
F. 자료분석 방법 -----------12
G. 연구의 제한점 -----------13
Ⅳ. 연구결과
A. 연구 대상자의 일반적 특성 --------14
B. 연구 대상자의 요로감염 관리에 대한 지식정도 ---15
C. 연구 대상자의 요로감염 관리에 대한 실천정도---18
D. 요로감염 관리의 지식과 실천정도와의 관계 -----21
E. 일반적 특성에 따른 요로감염 관리에 대한 지식과
실천정도------22
Ⅴ. 논의 ----------24
Ⅵ. 결론 및 제언 -------32
참고문헌------34
부 록 -----39
ABSTRACT------45Maste
Fabrication Process and Magnetostriction of Infiltrated Terfenol-D/Epoxy Composite
No full textGiant magnetostrictive composites have attracted a great deal of attention by supplementing shortcomings of monolithic Terfenol-D such as brittleness, eddy current loss and formability. Recently, infiltrated Terfenol-D/Epoxy composite has been developed as an alternative composite. This composite was fabricated by an unidirectional solidification of Terfenol-D followed by an infiltration of epoxy. The iron content in composite has been changed in order to control volume fraction of RFe2 phase producing magnetostriction on Terfenol-D/Epoxy composite. The magnetostriction of both as-grown and infiltrated Terfenol-D/Epoxy composite was measured to confirm the effects of eutectic phase and heat treatment on magnetostriction. The enhancement of magnetostriction of Terfenol-D/Epoxy composite was mostly contributed by the eutectic phase through the hindering of movement and rotation of domain walls. The magnetostriction modelling of Terfenol-D/Epoxy composite was suggested, based on the change of texture and elastic modulus. The suggested model was in good agreements with the experimental results on the measurement of magnetostriction of Terfenol-D/Epoxy composite
How soon to start: aspirin resumption after upper gastrointestinal bleed?
No full textBackground\ud
It is uncertain whether aspirin therapy should be continued after endoscopic hemostatic therapy in patients who develop peptic ulcer bleeding while receiving lowdose aspirin.\ud
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Objective\ud
To test that continuing aspirin therapy with protonpump inhibitors after endoscopic control of ulcer bleeding was not inferior to stopping aspirin therapy, in terms of recurrent ulcer bleeding in adults with cardiovascular or cerebrovascular diseases.\ud
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Design\ud
A parallel randomized, placebo-controlled noninferiority trial, in which both patients and clinicians were blinded to treatment assignment, was conducted from 2003 to 2006 by using computer-generated numbers in concealed envelopes. (ClinicalTrials.gov registration number: NCT00153725)\ud
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Setting\ud
A tertiary endoscopy center.\ud
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Patients\ud
Low-dose aspirin recipients with peptic ulcer bleeding.\ud
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Intervention\ud
78 patients received aspirin, 80 mg/d, and 78 received placebo for 8 weeks immediately after endoscopic therapy. All patients received a 72-hour infusion of pantoprazole followed by oral pantoprazole. All patients completed follow-up.\ud
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Measurements\ud
The primary end point was recurrent ulcer bleeding within 30 days confirmed by endoscopy. Secondary end points were all-cause and cause-specific mortality in 8 weeks.\ud
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Results\ud
156 patients were included in an intention-to-treat analysis. Three patients withdrew from the trial before finishing follow-up. Recurrent ulcer bleeding within 30 days was 10.3% in the aspirin group and 5.4% in the placebo group (difference, 4.9 percentage points [95% CI, -3.6 to 13.4 percentage points]). Patients who received aspirin had lower all-cause mortality rates than patients who received placebo (1.3% vs. 12.9%; difference, 11.6 percentage points [CI, 3.7 to 19.5 percentage points]). Patients in the aspirin group had lower mortality rates attributable to cardiovascular, cerebrovascular, or gastrointestinal complications than patients in the placebo group (1.3% vs. 10.3%; difference, 9 percentage points [CI, 1.7 to 16.3 percentage points]).\ud
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Limitations\ud
The sample size is relatively small, and only low-dose aspirin, 80 mg, was used. Two patients with recurrent bleeding in the placebo group did not have further endoscopy.\ud
\ud
Conclusion\ud
Among low-dose aspirin recipients who had peptic ulcer bleeding, continuous aspirin therapy may increase the risk for recurrent bleeding but potentially reduces mortality rates. Larger trials are needed to confirm these findings
Beyond Hygiene: Commensal Microbiota and Allergic Diseases.
No full textComplex communities of microorganisms, termed commensal microbiota, inhabit mucosal surfaces and profoundly influence host physiology as well as occurrence of allergic diseases. Perturbing factors such as the mode of delivery, dietary fibers and antibiotics can influence allergic diseases by altering commensal microbiota in affected tissues as well as in intestine. Here, we review current findings on the relationship between commensal microbiota and allergic diseases, and discuss the underlying mechanisms that contribute to the regulation of allergic responses by commensal microbiota.2
Power efficient Ka-band low phase noise VCO in 0.13 mu m CMOS
No full textA 27 GHz cross-coupled LC voltage controlled oscillator (VCO) using a standard 0.13 mu m CMOS technology is presented. The VCO using a high-Q LC resonator with a micro-strip inductor (mu-strip L) provides a phase noise of -113 dBc/Hz at a 1 MHz offset frequency. The figure-of-merit (FoM) is -194.6 dBc/Hz. To obtain high output power, it also uses a common source amplifier as a buffer and it shows the output power of 23.5 dBm at an oscillation frequency of 26.89 GHz. This is believed to be the lowest phase noise and FoM with the highest output power of a millimetre-wave VCO in CMOS technology
Inverse method to determine mechanical properties of thin film by nanoindentation and finite element analysis
No full textAs a reliable tool to measure the Youngs modulus, nanoindention technique has been used widely recently. In this paper, nanoindetation technique was overviewed with its advantage and limitation and a new method was proposed to determine material properties of film, i.e. both Youngs modulus E and Poissons ratio v from load-displacement curve of shallow-depth indentation using inverse method.Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, South Kore
Diffusion and Solid State NMR Studies of Structures in Model Biological Membranes
No full textWe studied the structures in model biological membranes using solid state NMR and NMR diffusion microscopy. We have created a stable bicelle system containing cholesterol, unsaturated and saturated lipids, capable of forming micron-scale lipid domains and suitable for structural biology studies of membrane proteins. The domains were observed by measuring time-dependent diffusion constants reflecting restricted diffusion of the lipids within micron-scale regions of the bicelles. We observed the correlation of bilayer structure of diverse bicelle systems with their alignment capability, using 31P NMR to measure the density of perforations in the bilayer as a function of bicelle alignment. We found a critical density for optimal bicelle alignment, applicable to bicelles of different lipid compositions. We were able to measure the effect of the perforation density on micron-scale domain formation in lipid bilayers. The perforations redistributed line active lipids within the bilayer, affecting the bulk line tension of the lipid domain. This work demonstrated that membrane topology can control domain formation
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