1,788 research outputs found
Playing Stackelberg Opinion Optimization with Randomized Algorithms for Combinatorial Strategies
From a perspective of designing or engineering for opinion formation games in
social networks, the "opinion maximization (or minimization)" problem has been
studied mainly for designing subset selecting algorithms. We furthermore define
a two-player zero-sum Stackelberg game of competitive opinion optimization by
letting the player under study as the first-mover minimize the sum of expressed
opinions by doing so-called "internal opinion design", knowing that the other
adversarial player as the follower is to maximize the same objective by also
conducting her own internal opinion design.
We propose for the min player to play the "follow-the-perturbed-leader"
algorithm in such Stackelberg game, obtaining losses depending on the other
adversarial player's play. Since our strategy of subset selection is
combinatorial in nature, the probabilities in a distribution over all the
strategies would be too many to be enumerated one by one. Thus, we design a
randomized algorithm to produce a (randomized) pure strategy. We show that the
strategy output by the randomized algorithm for the min player is essentially
an approximate equilibrium strategy against the other adversarial player
Exactly Solvable Lattice Hamiltonians and Gravitational Anomalies
We construct infinitely many new exactly solvable local commuting projector
lattice Hamiltonian models for general bosonic beyond group cohomology
invertible topological phases of order two and four in any spacetime
dimensions, whose boundaries are characterized by gravitational anomalies.
Examples include the beyond group cohomology invertible phase without symmetry
in (4+1)D that has an anomalous boundary topological order with
fermionic particle and fermionic loop excitations that have mutual
statistics. We argue that this construction gives a new non-trivial quantum
cellular automaton (QCA) in (4+1)D of order two. We also present an explicit
construction of gapped symmetric boundary state for the bosonic beyond group
cohomology invertible phase with unitary symmetry in (4+1)D. We
discuss new quantum phase transitions protected by different invertible phases
across the transitions.Comment: 60 pages, 14 figures, 3 tables; v2: typos corrected, references adde
Investigation of protein-protein interactions involving retinoblastoma binding protein 6 using immunoprecipitation and nuclear magnetic resonance spectroscopy
>Magister Scientiae - MScRetinoblastoma Binding Protein 6 (RBBP6) is a 200 KDa multi-domain protein that has been
shown to play a role in mRNA processing, cell cycle arrest and apoptosis. RBBP6 interacts with
tumour suppressor proteins such as p53 and pRb and has been shown cooperate with Murine
Double Minute 2 (MDM2) protein in catalyzing ubiquitination and suppression of p53.
Unpublished data from our laboratory has suggested that RBBP6 and MDM2 interact with each
other through their RING finger domains. RBBP6 has also been shown to have its own E3 ubiquitin
ligase activity, catalyzing ubiquitination of Y-Box Binding Protein 1 (YB-1) in vitro and in vivo. YB-
1 is a multifunctional oncogenic protein that is generally associated with poor prognosis in cancer,
tumourigenesis, metastasis and chemotherapeutic resistance. Unpublished data from our
laboratory shows that RBBP6 catalyzes poly-ubiquitination of YB-1, using Ubiquitin-conjugating
enzyme H1 (UbcH1) as E2 ubiquitin conjugating enzyme
Analysis of the Rice Husk Pyrolysis Products from a Fluidized Bed Reactor
AbstractRice husks are pyrolyzed in a fluidized bed pyrolyzer using glass beads as the fluidizing media. The effects of the rice husk feeding rate and the fluidizing nitrogen gas flow rates on the mass fraction of the produced syngas, bio-oil and char are studied. The highest bio-oil mass fraction in the product is around 30% when the rice husk feeding rate and the fluidizing nitrogen gas flow rate are 10g/min and 40 L/min, respectively. The chars collected at different parts of the system are analyzed by TGA. The results indicate that although the chars have different content of volatiles, they are relatively clean. GC/MS analysing results indicate that the major compounds in the bio-oil are aromatic compounds, including toluene, phenol, furfural, methylphenol, ethylphenol, benzenediol, and etc
On the Efficiency of An Election Game of Two or More Parties: How Bad Can It Be?
We extend our previous work on two-party election competition [Lin, Lu & Chen
2021] to the setting of three or more parties. An election campaign among two
or more parties is viewed as a game of two or more players. Each of them has
its own candidates as the pure strategies to play. People, as voters, comprise
supporters for each party, and a candidate brings utility for the the
supporters of each party. Each player nominates exactly one of its candidates
to compete against the other party's. A candidate is assumed to win the
election with higher odds if it brings more utility for all the people. The
payoff of each player is the expected utility its supporters get. The game is
egoistic if every candidate benefits her party's supporters more than any
candidate from the competing party does. In this work, we first argue that the
election game always has a pure Nash equilibrium when the winner is chosen by
the hardmax function, while there exist game instances in the three-party
election game such that no pure Nash equilibrium exists even the game is
egoistic. Next, we propose two sufficient conditions for the egoistic election
game to have a pure Nash equilibrium. Based on these conditions, we propose a
fixed-parameter tractable algorithm to compute a pure Nash equilibrium of the
egoistic election game. Finally, perhaps surprisingly, we show that the price
of anarchy of the egoistic election game is upper bounded by the number of
parties. Our findings suggest that the election becomes unpredictable when more
than two parties are involved and, moreover, the social welfare deteriorates
with the number of participating parties in terms of possibly increasing price
of anarchy. This work alternatively explains why the two-party system is
prevalent in democratic countries
Higher-group symmetry in finite gauge theory and stabilizer codes
A large class of gapped phases of matter can be described by topological
finite group gauge theories. In this paper, we derive the -group global
symmetry and its 't Hooft anomaly for topological finite group gauge theories
in space-time dimensions, including non-Abelian gauge groups and
Dijkgraaf-Witten twists. We focus on the 1-form symmetry generated by
invertible (Abelian) magnetic defects and the higher-form symmetries generated
by invertible topological defects decorated with lower dimensional gauged
symmetry-protected topological (SPT) phases. We show that due to a
generalization of the Witten effect and charge-flux attachment, the 1-form
symmetry generated by the magnetic defects mixes with other symmetries into a
higher group. We describe such higher-group symmetry in various lattice model
examples. We discuss several applications, including the classification of
fermionic SPT phases in (3+1)D for general fermionic symmetry groups, where we
also derive a simpler formula for the obstruction
than has appeared in previous work. We also show how the -group symmetry is
related to fault-tolerant non-Pauli logical gates and a refined Clifford
hierarchy in stabilizer codes. We construct new logical gates in stabilizer
codes using the -group symmetry, such as the control-Z gate in (3+1)D
toric code.Comment: 41 pages, 6 figure
Understanding Cross National Difference in Knowledge Seeking Behavior Model: A Survival Perspective
Electronic Knowledge Repository (EKR) is one of the most commonly deployed knowledge management technologies, yet its success is hindered by employees’ underutilization and further complicated when implemented in the multinational context. To address these challenges, we propose a research model by conceptualizing employees’ knowledge seeking via EKR as a survival-centric behavior, identifying the technology acceptance model as the individual-level explanation for EKR use, and drawing on the thermal demands-resources theory for explaining cross national behavioral differences. Using hierarchical linear modeling, we tested the model with data from 1352 randomly sampled knowledge workers across 30 nations. The results reveal interesting cross national behavioral patterns. Specifically, thermal climates and national wealth at the macro-level interactively moderate individual-level relationships between perceived ease of use and perceived usefulness and between perceived usefulness and behavioral intention
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