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Systematic Design of High-Resolution High-Frequency Cascade Continuous-Time Sigma-Delta Modulators
Ramón Tortosa,Rafael Castro-López,Elisenda Roca,Ángel Rodríguez-Vázquez,F.V. Fernández 한국전자통신연구원 2008 ETRI Journal Vol.30 No.4
This paper introduces a systematic top-down and bottom-up design methodology to assist the designer in the implementation of continuous-time (CT) cascade sigmadelta (ΣΔ) modulators. The salient features of this methodology are (a) flexible behavioral modeling for optimum accuracy-efficiency trade-offs at different stages of the top-down synthesis process, (b) direct synthesis in the continuous-time domain for minimum circuit complexity and sensitivity, (c) mixed knowledge-based and optimization-based architectural exploration and specification transmission for enhanced circuit performance, and (d) use of Pareto-optimal fronts of building blocks to reduce re-design iterations. The applicability of this methodology will be illustrated via the design of a 12-bit 20 MHz CT ΣΔ modulator in a 1.2 V 130 nm CMOS technology.
Natural products in the research of cholesterol gallstones
Ibrahim Guillermo Castro-Torres,Minarda De la O-Arciniega,Janeth Gallegos-Estudillo,Mariano Martínez-Vázquez,Elia Brosla Naranjo-Rodríguez,Miguel Ángel Domínguez-Ortíz,Jesús Samuel Cruz-Sánchez 셀메드 세포교정의약학회 2013 TANG Vol.3 No.3
Cholesterol gallstones are a digestive disease of high prevalence that has many risk factors; for this reason, research has focused mainly on how to prevent it rather than how to treat it. Many molecules of the hepatic, bile and intestinal systems are involved in the pathophysiology of this disease, making it very difficult to find a therapeutic target. The pharmacological treatment is limited, so when gallstones generate symptoms, medical treatment indicates gallbladder removal. Ursodeoxycholic acid is used to dissolve cholesterol stones, and ezetimibe and statins are other drugs with possible applications in the treatment of this disease. Given the small number of drugs that have been developed for treating this disease, the research of natural products becomes of paramount importance. Resources such as black radish, glucosinolates, fenugreek, capsaicin, curcumin, garlic, and onion, have all shown significant effects in the prevention and treatment of cholesterol gallstones. In this review, we made a synthesis of the scientific reports that deal with these natural products and that can serve as antecedents for finding a way to treat the most common disease of the gallbladder.