the theoretical basis for data communication
Tài liệu Lecture 14: The Theoretical Basis for Data Communication: pptx
... 2000 Lecture 14 Communication Basics Part-2 The Theoretical Basis for Data Communication: Frequency-domain concept: A sine wave with a frequency of 1 kHz will look like this in the frequency ... So, for a 10 dBm signal (10 mW) the noise level has to be less than -20 dBm (10 microW). Shanon Theorem: Mathematical guidelines have been established to determine the maximum theoretical ... another. The formula for calculating decibel is : dB = 10 log Po/Pi = 10 log 1000mW/10mW = 10 log 100 = 10 x 2 =20 dB tells us the ratio of two power levels, that is it expresses the...
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Báo cáo khoa học: The structural basis for catalytic function of GMD and RMD, two closely related enzymes from the GDP-D-rhamnose biosynthesis pathway pdf
... was performed for 1 h, the enzyme wasremoved by filtration, and then enzyme and cofactor for the second reaction were added. To determine the optimalpH for enzyme-catalyzed reactions, the extent ... positions of the corresponding side chain, Arg220, the NADPH cofactor and the substrate analog hexosein the MUR1 structure (Fig. 11). Some of the distancesbetween these groups are rather long for classic ... form the catalytic triad. No clear electron density is seen for the nicotinamide ring,and even the nicotinamide ribose shows some indications of disorder; in fact, the average B-factor for the...
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Tài liệu Chapter 6 The Data Communications Interface pdf
... transition 1 to 0❚Then samples next seven intervals (char length)❚Then looks for next 1 to 0 for next char❚Simple❚Cheap❚Overhead of 2 or 3 bits per char (~20%)❚Good for data with large ... data ❙Manchester encoding❙Carrier frequency (analog) William Stallings Data and Computer CommunicationsChapter 6 The Data Communications Interface Synchronous - Block Level❚Need to indicate ... carry both data and control ISDN Electrical Specification❚Balanced transmission❙Carried on two lines, e.g. twisted pair❙Signals as currents down one conductor and up the other❙Differential...
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Tài liệu Báo cáo khoa học: Kinetic basis for linking the first two enzymes of chlorophyll biosynthesis doc
... methyltransferasesteps. The KD for the H ⁄ ID interaction wastaken from Jensen et al. 1998 [24], and the KD for the association with ChlM is fromFig. 1. The possible effects of varying the concentration of the ... greatly influence the cata-lytic rate of CHLM, the eukaryotic MgP methyl-transferase. This has important implications for the coupling between these steps and for the availabilityof MgP for signalling. ... 4537Kinetic basis for linking the first two enzymes ofchlorophyll biosynthesisMark Shepherd, Samantha McLean and C. Neil HunterRobert Hill Institute for Photosynthesis and Krebs Institute for Biomolecular...
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Đề tài " A five element basis for the uncountable linear orders " doc
... element basis. In fact such a basis follows from the ProperForcing Axiom, a strong form of the Baire Category Theorem. The elementsare X, ω1, ω∗1, C, C∗where X is any suborder of the reals ... versed in settheory and the major developments in the field in the 70s and 80s. The readeris assumed to have proficiency in the areas of Aronszajn tree combinatorics,forcing axioms, the combinatorics ... ∆Xξ(0),Xη(0)are in K for all j<n. The next lemma draws the connection between ∂H(K) and the forcing∂(K). We will then spend the remainder of the paper analyzing ∂(K).Lemma 5.22...
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Báo cáo khoa học: Investigations into the ability of an oblique a-helical template to provide the basis for design of an antimicrobial anionic amphiphilic peptide pot
... membranes, but, in the presence of the peptide, they are positive. These results confirm thatE. coli membranes are thermodynamically less stablein the presence of AP1, further supporting the sugges-tion ... observed for E. coli modelmembranes, indicating that, although the lipids form-ing these monolayers are miscible, repulsive interac-tions are established in the presence of the peptide,thereby ... pressure (p) for lipidmixtures that correspond to membranes of E. coli. Values for these parameters were computed either in the presence or absence of AP1using data from compression isotherms (Fig....
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Báo cáo khoa học: Structural basis for the erythro-stereospecificity of the L-arginine oxygenase VioC in viomycin biosynthesis docx
... conformational control of the bound sub-strate, which enforces a gauche(–) conformer for v1instead of the transconformers observed for the asparagine oxygenase AsnO and other mem-bers of the ... trans to modify the assembled peptide or to synthesize the buildingblocks for the nonribosomal peptide synthesis [9,10]. In the case of viomycin, the annotation of the biosynthesisgene cluster ... mimic, the tartrateis similarly bound as found before for aKG and succi-nate in other CSL oxygenases [20,21]. The coordina-tion of the 1-carboxylate of aKG is known to beeither trans to the...
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Báo cáo khoa học: "Theoretical Evaluation of Estimation Methods for Data-Oriented Parsing" pot
... reliablyrecover the true weights. The relevant test is whether for all possibleSTSGs and in the limit of infinite data, the ex-pected relative frequencies of trees given the es-timated grammar, equal the ... com-binations of the frequencies f1. . . f4. Observa-tions of these frequencies therefore do not addany extra information, and the problem of fi nd-ing the weights of the target grammar ... TV, Amsterdam, the Netherlands.jzuidema@science.uva.nlAbstractWe analyze estimation methods for Data- Oriented Parsing, as well as the theoret-ical criteria used to evaluate them. Weshow...
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Báo cáo Y học: Structural basis for the inhibitory efficacy of efavirenz (DMP-266), MSC194 and PNU142721 towards the HIV-1 RT K103N mutant doc
... reduced by the s tacking of O d1 in between the plane of the thioureamoiety and the Ca of G190.Hence, the undefined orientation of the N103 amide Od1and Nd2 atoms may r eflect the repulsive forces ... with the K103Nmutant revealed that the overall position of the inhibitor aswell as the r esidues lining the NNIBP corresponds to the wild-type–Efavirenz complex (Fig. 3). C omparison between the ... (Table 3). The effects of the K103N mutation on the hydrophobicinteractions reveal individual differences among the t hreecompounds. Though t he electron density for the a mide partof the residue...
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Báo cáo khoa học: Structural basis for the recognition of complex-type biantennary oligosaccharides by Pterocarpus angolensis lectin ppt
... NA2F. These results together with thermodynamicbinding data indicate that the complete oligosaccharide binding site of the lectin consists of five subsites allowing the specific recognition of the ... car-bohydrate. The electron density for fourwater molecules that occupy the bindingsite is shown, together with the hydrogenbond network these waters make with the protein. Superimposed in black are the equivalent ... conclude that the reason for the difference in energetics of the )1 subsitebetween PAL and con A must be due to details in the interaction between the protein and the carbohydrateand not to the carbohydrate...
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Published quarterly by the Research Collaboratory for Structural Bioinformatics Protein Data Bank ppt
... award points for the accuracy of the model and for the addition of materials that illustrated the function of the protein. The team from SouthBrunswick marked the betasheets in their model afterviewing ... generatereports, the different options for exploring individual structures,and many of the resources and tools available at the RCSB PDB for research and education. The full tutorial runs for about ... options, the Molecule of the Month can be replaced with forms to download files and search by sequence. Other widgets that can be displayed on the home page include the RCSB PDBComparison Tool for...
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Báo cáo khoa học: Structural basis for the interaction between dynein light chain 1 and the glutamate channel homolog GRINL1A docx
... area.Figure 4A shows the 20 lowest-energy conformersfrom the selected cluster modelled using the Haddockdocking calculations. The rmsd values for the 20lowest-energy conformers of the best cluster ... 0.11 A˚ for the backbone and 1.11 ± 0.09 A˚ for the heavy atoms. The mean total energy of the ensemble is )8146 kcalÆmol)1, being )314 kcalÆmol)1 the intermolecular contribution. The correspondingvalues ... present in the GRINL1A target, the interaction still occurs in the canonical mode (Fig. 4B). The peptide lies along the grooves at each side of the DYNLL1 dimer interface,extending the central...
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Báo cáo khoa học: "Big Data versus the Crowd: Looking for Relationships in All the Right Places" docx
... Freebase and the corpus into two halves.One database-corpus pair is used for training and the other pair for testing. We evaluate the precision over the 103highest-probability predictions on the testset. ... re-call. On the other hand, the quality improvementrate is roughly log-linear against the corpus size.Recall that each data point in Figure 2 is the aver-age from 30 trials. To measure the statistical ... the testset. In Figure 5, we vary the size of the corpus in the train pair and the number of human labels; the pre-cision reaches a dramatic peak when we the corpussize is above 105and uses...
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Báo cáo khoa học: Structural basis for the changed substrate specificity of Drosophila melanogaster deoxyribonucleoside kinase mutant N64D docx
... with the substrate dT, in red,and with AZT modeled in the substrate binding site, in blue. The interactions with the substrate are the same in the wildtype and the N64D mutant except for the ... andanalyzing the data by the Biosoft (Cambridge, UK) pro-gram enzfitter for Windows.Crystallization The N64D mutant used for crystallization was truncated for the 20 C-terminal amino acids. The C-terminal ... is there-fore a particularly attractive candidate for the medicalgene therapy applications mentioned above, as well as for industrial synthesis of d(d)NTPs and their analogs[6,15]. To further...
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Báo cáo khoa học: "A Logical Basis for the D Combinator and Normal Form in CCG" pptx
... Wallace) ate)?Finally, the unary combinator basis for CCG pro-vides an interesting additional specification for gen-erating CCG rules. Like the CTL basis, the unarycombinator basis can produce a ... two theorems about the set of semantically equivalent parses that a CCGparser will generate for a given string (see (Eisner,1996) for proofs and discussion of the theorems):(31) Theorem 1 : For ... Noscl.1phizomade.3sleerreadEl the SeñorLorddeoflos the Anillos.Rings“He made us read The Lord of the Rings.” The aspect of the construction that is relevant hereis that the causative verb hacer...
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