The rapid diffusion of online social networks has shifted a large proportion of human interaction away from traditional means of communication. The purpose of this work is to assess concerns regarding the quality of the relationships supported through online social networks. Properties of interaction are assumed to be a reasonable benchmark for the quality of relationships among people. Therefo...

In linear text classification, user feedback is usually used to tune up the representative keywords (RK) for a certain class. Despite some algorithms (e.g. Rocchio) deal well with user positive and negative feedback to adjust the RKs, few researches have investigated how to adjust RKs only based on a small positive responses which is a popular case in the real-world application (e.g. users tend...

In several recent, and highly provocative papers, McGuire and Hildebrandt (Hildebrandt and McGuire 2002,2003; McCuire and Hildebrandt 2005) have helped introduce costly signaling theory into American archaeology. While their ejbrts are commendable, we,feel that their reinterpretations of western North American prehistoly overstate the likely influence of costly signaling on the archaeological r...

1. Ecogeomorphic feedbacks between mineral sediment deposition and above-ground plant growth are thought to have dominated the evolution of many coastal ecosystems and landforms. However, land-use-related reductions in sediment delivery rates to estuaries world-wide suggest that these above-ground feedbacks may not apply in some of the world’s most vulnerable coastal landscapes. 2. To understan...

A high DC-gain low-power current recycling amplifier using positive-feedback technique is presented. In the proposed amplifier, the positive-feedback signal used to enhance the DC-gain is derived from the extra nodes created by cascoding. Positive-feedback offers the ability of obtaining a very high DC-gain, ideally infinite gain, without affecting high frequency performance and stability. Unde...

The climate feedbacks in coupled ocean–atmosphere models are compared using a coordinated set of twenty-first-century climate change experiments. Water vapor is found to provide the largest positive feedback in all models and its strength is consistent with that expected from constant relative humidity changes in the water vapor mixing ratio. The feedbacks from clouds and surface albedo are als...

New data on clouds and moisture, made possible by reanalysis of weather satellite observations, show that the atmosphere reacts to warm ocean pools in the Western Pacific Ocean with increased moisture and cloudiness~ suggesting a negative feedback limiting the rise in seasurface temperature. The reverse was observed over hot deserts where both moisture and cloudiness decrease, suggesting a posi...

Development assistance has a chequered past, in large part because planning for development assistance is historically such a fractured enterprise internally, and so disassociated from development assistance recipients’ assets and needs. The authors of environment-shaping offer an alternative development programme planning methodology that highlights above all else the ever-important relationsh...

We study framing effects in repeated social dilemmas by comparing payoff-equivalent Giveand Take-framed public goods games under varying matching mechanisms (Partners or Strangers) and levels of feedback (Aggregate or Individual). In the Give-framed game, players contribute to a public good, while in the Take-framed game, players take from an existing public good. The results show Take framing ...

For feedback loops involving single input, single output monotone systems with well-defined I/O characteristics, a recent paper by Angeli and Sontag provided an approach to determining the location and stability of steady states. A result on global convergence for multistable systems followed as a consequence of the technique. The present paper extends the approach to multiple inputs and output...