Improving the fairness of FAST TCP to new flows

It has been observed that FAST TCP, and the related protocol TCP Vegas, suffer unfairness when many flows arrive at a single bottleneck link, without intervening departures. We show that the effect is even more marked if a new flow arrives when existing flows share bandwidth fairly, and propose a simple method to ameliorate this effect

μ-3-Thienylmalonato-κ2 O 1:O 3-bis­[triphenyl­tin(IV)]

The title compound, [Sn2(C6H5)6(C7H4O4S)], contains two molecules with similar conformations in the asymmetric unit. In each mol­ecule, the Sn atoms adopt a distorted tetra­hedral geometry arising from three C atoms of three phenyl rings and one O atom from the bridging 3-thienylmalonato ligand. The mol­ecules lie about inversion centers with the ligands facing each other, with C⋯O distances of 3.417 (10) and 3.475 (10) Å

Di-μ-hydroxido-bis­[aqua­trichlorido­tin(IV)] diethyl ether disolvate

The title compound, [Sn2Cl6(OH)2(H2O)2]·2C4H10O, consists of a centrosymmetric molecule and two additional solvent molecules and has an infinite two-dimensional network extending parallel to (101). The Sn atom is six-coordinate with a distorted octa­hedral geometry. Additional O—H⋯O hydrogen bonding leads to stabilization of the crystal structure

Bis(4-amino­benzoato-κO)triphenylanti­mony(V)

The structure of the title compound, [Sb(C6H5)3(C7H6NO2)2], contains two independent mol­ecules of similar configuration. The Sb atoms exhibit a distorted trigonal–bipyramidal geometry with the O atoms of two carboxyl­ate groups in the axial positions and the C atoms of the phenyl groups in the equatorial positions. In the crystal structure, mol­ecules are connected by inter­molecular N—H⋯O and N—H⋯N hydrogen-bonding inter­actions forming a chain structure along [100]

catena-Poly[[(N,N-diethyl­dithio­carbamato-κ2 S:S′)phenyl­bismuth(III)]-μ-chlorido]

In the title compound, [Bi(C6H5)(C5H10NS2)Cl]n, the Bi atom is coordinated by two S atoms of the dithio­carbamate ligand, one C atom of the phenyl group and one Cl atom in a four-coordinated tetra­hedral configuration. Mol­ecules are linked by Cl atoms to form a zigzag chain extending in the c direction

catena-Poly[[diaqua­calcium(II)]-di-μ-2-chloro­nicotinato]

The itle compound, [Ca(C6H3ClNO2)2(H2O)2]n, contains polymeric chains extending along [100] that are generated by inversion centres. The Ca2+ ions are bridged by 2-chloronicotinate groups and exhibit an eight-coordination by six carboxylate O atoms of four different 2-chloronicotinate ligands and two O atoms of water molecules. In the crystal structure, inter­molecular O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds result in the formation of a supra­molecular network structure. The π–π contacts between the 2-chloro­nicotinate rings [centroid–centroid distances = 3.875 (3) and 3.701 (3) Å] may further stabilize the structure

Triphenyl­bis[4-(trifluoro­meth­yl)benzoato-κO]anti­mony(V)

The title complex, [Sb(C6H5)3(C8H4F3O2)2], is located on a twofold axis defined by the metal center and two C atoms of a coordinated phenyl group. The environment of the Sb atom approximates a trigonal-bipyramidal geometry, with the axial positions occupied by the O atoms of symmetry-related 4-(trifluoro­meth­yl)benzoate ligands. In this ligand, the CF3 group is disordered by rotation about the C—C bond and the F atoms are distributed over two sets of sites with occupancies of 0.62 (3) and 0.38 (3). In the crystal, mol­ecules are assembled in a three-dimensional framework through weak C—H⋯O hydrogen bonds

Keyword Query Reformulation on Structured Data

Textual web pages dominate web search engines nowadays. However, there is also a striking increase of structured data on the web. Efficient keyword query processing on structured data has attracted enough attention, but effective query understanding has yet to be investigated. In this paper, we focus on the problem of keyword query reformulation in the structured data scenario. These reformulated queries provide alternative descriptions of original input. They could better capture users' information need and guide users to explore related items in the target structured data. We propose an automatic keyword query reformulation approach by exploiting structural semantics in the underlying structured data sources. The reformulation solution is decomposed into two stages, i.e., offline term relation extraction and online query generation. We first utilize a heterogenous graph to model the words and items in structured data, and design an enhanced Random Walk approach to extract relevant terms from the graph context. In the online query reformulation stage, we introduce an efficient probabilistic generation module to suggest substitutable reformulated queries. Extensive experiments are conducted on a real-life data set, and our approach yields promising results.Computer Science, Theory & MethodsEngineering, Electrical & ElectronicCPCI-S(ISTP)

2-[(2-Hydroxy-1-naphthyl)methyleneamino]-1,3-benzothiazole

In the title compound, C18H12N2OS, the dihedral angle between the mean planes of the aromatic ring systems is 7.26 (8)°. There is an intramolecular O—H...N hydrogen bond, forming a six-membered ring. In the crystal structure, intermolecular C—H...N hydrogen bonds link the molecules into a one-dimensional chain

Fairness comparison of FAST TCP and TCP Vegas

This paper compares the equilibrium properties of FAST TCP and TCP Vegas. Although the two have the same equilibrium point when all sources know their true propagation delays, FAST is fairer when there are estimation errors. The performance of Vegas approaches that of FAST when the queueing delay is very much less than the propagation delay