Multiple Messages Research Articles

Batch quantum multi-proxy signature

A batch quantum multi-proxy signature scheme is proposed, in which the original signatory distributes his signing right to multiple proxy signatories, and these proxy signatories can sign multiple messages. The proxy signatories generate some single particles, and the original signatory uses the quantum-controlled-not to transmit the signing information to these single particles. Then the proxy signatories measure these single particles to generate the signature, and the arbitrator uses the comparison of quantum states to verify the signature. Compared to the existing schemes, the main merit of our scheme is that multiple quantum messages can be signed. So the signing efficiency will be increased greatly.

Local preference encoded by complex signaling: mechanisms of mate preference in the red-eyed treefrog (Agalychnis callidryas)

The Central American red-eyed treefrog (Agalychnis callidryas) is a nocturnal/crepuscular frog that exhibits high population-level phenotypic variation in a suite of traits generally important in anuran communication. Females of this species demonstrate a preference for local over non-local males, although the contribution of different communication modes to mate choice remains untested. We performed eight sets of experiments at La Selva Biological Station (Costa Rica) to test the relative roles of male advertisement call and flank-stripe pattern on female mate choice. For each trial, we used pre-recorded calls for acoustic signals and/or 3D-printed, hand-painted models for visual stimulus. Females selected conspecifics over heterospecifics when presented with either acoustic or visual stimuli only, indicating that both evolve as species-specific signals used for mate discrimination. Bayesian modeling showed that females chose local males over non-locals based on unimodal; responses to multimodal signals varied. Female mate choice in this species is likely nuanced and subject to the constraints of the local environment in which animals are signaling. Our data show that at least two traits that vary among populations are important for mate selection. Evolution shapes animal communication in diverse ways to accommodate complicated signaling contexts, including environmental noise, the presence of eavesdroppers, and changing landscapes. Among species that use complex signals or signals in multiple modalities, understanding the role of signaling traits in reproductive behavior and their concomitant shifts between populations can shed light on lineage divergence, speciation, and the forces shaping communication. We used choice tests with Agalychnis callidryas to determine which traits lead to local-male mate preference. We found that both call and stripe are each sufficient to allow this nocturnal frog to choose mates in absence of the other stimulus. Multimodal signals were marginally better than call—but not color—alone. This may be a result of statistical noise or preliminary evidence of asymmetric use of traits across a complex landscape. These results suggest that call and color may encode both redundant information and multiple messages to receivers in this species: either is sufficient to elicit mate choice (redundant), but together, they enhance local mate preference (multiple messages). Further tests on how other communication modalities inform behavior will add to our understanding of complex signaling and lineage divergence among differentiated populations in this species.

Utilization of an Electronic Patient Portal Following Total Joint Arthroplasty Does Not Decrease Readmissions

BackgroundAt the investigating institution, an electronic messaging portal (MyChart) allows patients to directly communicate with their healthcare provider. As reimbursement models evolve, there is an increasing effort to decrease 90-day hospital resource utilization and patient returns, and secure messaging portals have been proposed as one way to achieve this goal. We sought to determine which patients utilize this portal, and to determine the impact of secure messaging on emergency department (ED) visits and readmissions within 90 days postoperatively. MethodsThe institutional database was used to analyze 6426 procedures including 3297 primary total knee and 3129 primary total hip arthroplasties. Patient demographics, comorbidities, and secure communication activity status were recorded. Subsequently, statistical analysis was performed to determine which patients utilized MyChart, as well as to correlate patient outcomes to the utilization of secure messaging portals. ResultsActive MyChart users were significantly more likely to be young, healthy (American Society of Anesthesiologists 1 or 2), Caucasian, married, employed, have private insurance, and be discharged to home. Decreased utilization was seen in patients who were unhealthy (American Society of Anesthesiologists 3 or 4), were African American, unmarried, unemployed, had Medicare or Medicaid insurance, and were discharged to a skilled nursing facility; these characteristics were also independent significant risks for returning to the ED. Active MyChart status was not significantly associated with 90-day ED return (P = .781) or readmission (P = .512). However, if multiple messages to providers were sent, and the provider response rate was <75%, patients had significantly more readmissions (P = .004). ConclusionPrimary total joint arthroplasty patients who were at high risk for ED returns were less likely to utilize MyChart. However, MyChart use did not decrease the 90-day rate of return to the ED or readmissions. A low provider response rate to the secure messages may lead to increased resource utilization in patients using secure messaging as their preferred communication tool. Alternative means of communication with the most vulnerable patients must be investigated to effectively decrease postoperative complications and resource utilization.

Efficient online/offline IBSS protocol using partial discrete logarithm for WSNs

An online/offline identity-based short signature (IBSS) protocol permits the signer to produce an online IBSS in real time from a precomputed offline IBSS when given a record. Such techniques are especially valuable in resource-constrained wireless sensor network (WSN) applications. Recently, Meshram et al. presented an UF-IBSS-CMA-protected online/offline IBSS protocol using partial discrete logarithm. In this study, the authors propose an extension of Meshram et al. scheme and compare with other IBSS protocols. The presented offline signing process does not want any private data from the signer. Henceforth, it can be created by any reliable outsider with the private key generation (PKG). This is especially valuable as the base station for a WSN node, performing as a PKG, can produce the offline data and the node does not have to come back to the base station for the re-establishment of the offline data each time signing is implemented. Also, they demonstrate how the scheme can be extended to allow a single user to sign multiple messages and its implementation on WSN.

Fashion and the femmes tondues: Lee Miller, Vogue and representing Liberation France

This article will examine representations of the Liberation of France in the war reports of Lee Miller, an accredited photographer and correspondent for American and British Vogue during the Second World War. Miller’s frontline reports framed Liberation France in idealised images of feminine beauty and elegance, making use of fashion as a primary conduit for understanding the war and occupation for readers on the home front. As this article will argue, examining Miller’s choices and perspective as a female photographer sheds new light on the intersection of fashion, war photography and the female body. In Miller’s work, fashion becomes a site for imagining liberation in ways that foreground the gendering of war experience and the legacies of conflict for women. By charting Miller’s representations of French women at the Liberation, and above all the chastised figure of the femme tondue, this article will analyse how French women function as carriers of multiple messages about war, liberation and reconstruction in Miller’s work. Unlike the sensationalist images of the femmes tondues published in the British picture press and newspapers in the summer of 1944, Miller’s war reports in Vogue construct an empathic relationship with such underprivileged female subjects. Miller’s work opens a space, therefore, for speculation on the role of fashion in shaping how the Second World War was understood by a first generation of female memory producers and consumers.

Protocol Stack of Underwater Wireless Sensor Network: Classical Approaches and New Trends

The oceans and rivers remain the least explored frontiers on earth but due to frequent occurrences of disasters or calamities, the researchers have shown keen interest towards underwater monitoring. Underwater Wireless Sensor Networks (UWSN) envisioned as an aquatic medium for variety of applications like oceanographic data collection, disaster management or prevention, assisted navigation, attack protection, and pollution monitoring. Like terrestrial Wireless Sensor Networks (WSN), UWSN consists of sensor nodes that collect the information and pass it to sink, however researchers have to face many challenges in executing the network in aquatic medium. Some of these challenges are mobile sensor nodes, large propagation delays, limited link capacity, and multiple message receptions. In this manuscript, broad survey of issues concerning underwater sensor networks is presented. We provide an overview of test beds, routing protocols, experimental projects, simulation platforms, tools and analysis that are available with research fraternity.

An extended SEIR model considering homepage effect for the information propagation of online social networks

In this work we extend the SEIR model as in epidemic disease modeling to investigate the propagation dynamics of the information online. Here, we go one step further and takes the homepage effect into consideration, acting as the infectious sources in infectious diseases. Aside of the mathematical analysis, the results of simulation also show some managerial insights that are helpful for controlling the information spread. Furthermore, a case study, usingthe information propagation data in Digg.com, is carried out to examine the effectiveness of two propagation models. Our study could be a starting point for developing a more realistic model about the online propagation dynamics of multiple messages.

Towards optimal scheduling policy for heterogeneous memory architecture in many-core system

With the advent of Intels second-generation many-core processor (Knights Landing: KNL), high-bandwidth memory (HBM) with potentially five times more bandwidth than existing dynamic random-access memory has become available as a valuable computing resource for high-performance computing (HPC) applications. Therefore, resource management schemes should now be able to consider existing central processing unit cores, conventional main memory, and this newly available HBM to improve the overall system throughput and user response time. In this paper, we present our profiling mechanism and related scheduling policy that analyzes the resource usage patterns of various HPC workloads. By carefully allocating memory-intensive workloads to HBM in KNL, we show that the overall performance of multiple message passing interface workloads can be improved in terms of the execution time and system utilization. We evaluate and verify the effectiveness of our scheme for optimizing the use of HBM by using NAS Parallel Benchmarks.

Significant life experiences and their relationship with the education of the scrutinizing gaze in the beauty ecologist César Manrique

ABSTRACTThe reality of the nature that we see can have multiple messages and meanings. Some of these are patent and continuously communicate with the individual, but others are hidden and are more difficult to unravel. A deep, contemplative and scrutinizing gaze is necessary to detect these messages. Educating this “new” way of seeing can help reinforce a person-nature bond that includes the aesthetic appreciation of beauty. This work shows the education of the gaze related to the artist César Manrique and the special bond that he established with the island of Lanzarote. He describes some key experiences, considered to be significant life experiences (SLEs), that revealed deep and secret messages to him and made him understand the true magnitude of the person-nature bond.

Alternative direction for 3D orthogonal frequency division multiplexing massive MIMO FDD channel estimation and feedback

In this study, downlink channel estimation of three-dimensional massive multiple-input multiple-output (3D-MIMO) system operating in the frequency division duplexing (FDD) mode is considered. Inspired by the channel sparsity property, this study proposes a compressive sensing algorithm to exploit the channel sparsity structure in the angle-time domain. The proposed algorithm, named AMP-ADM, combines the multiple approximate message passing (M-AMP) algorithm with the alternative direction of multiplier (ADM) technique to efficiently exploit the sparsity structure of the 3D massive MIMO channel. First, the proposed AMP-ADM is implemented in the case of the conventional estimation for the FDD protocol where the channel is estimated individually at each user equipment. Then, building on this algorithm, a low complexity feedback AMP-ADM-T scheme at the transmitting base station (BS) side is proposed. In the proposed feedback AMP-ADM-T technique the users' channels are jointly estimated at the BS to fully exploit the common sparsity basis. Complexity and convergence analyses are provided for both the AMP-ADM and feedback AMP-ADM-T algorithms. Simulation results prove the improved performance of the proposed feedback AMP-ADM-T algorithm compared to different state-of-the-art joint channel estimation techniques.

Strong Secrecy on a Class of Degraded Broadcast Channels Using Polar Codes.

Asymptotic secrecy-capacity achieving polar coding schemes are proposed for the memoryless degraded broadcast channel under different reliability and secrecy requirements: layered decoding or layered secrecy. In these settings, the transmitter wishes to send multiple messages to a set of legitimate receivers keeping them masked from a set of eavesdroppers. The layered decoding structure requires receivers with better channel quality to reliably decode more messages, while the layered secrecy structure requires eavesdroppers with worse channel quality to be kept ignorant of more messages. Practical constructions for the proposed polar coding schemes are discussed and their performance evaluated by means of simulations.

Why Do Males Use Multiple Signals? Insights From Measuring Wild Male Behavior Over Lifespans

Why animals commonly use multiple conspicuous and presumably costly signals is poorly understood. Tests of evolutionary hypotheses comprehensively covering the signalling repertoire in wild populations are crucial to establish biological relevance, yet are relatively rare. We tested a key hypothesis for the maintenance of multiple signals in a wild population of the lizard, Psammophilus dorsalis, specifically whether multiple signals are maintained as multiple messages directed at different receivers. In addition, we also examined patterns in covariation of signals as an initial test of an alternative hypothesis, that multiple signals may be maintained as redundant signals; such traits are proposed to convey and reinforce the same component of information and are expected to be strongly correlated. Breeding male P. dorsalis display from prominent rock perches within their territories, which overlap multiple female home ranges in rocky open habitats. We repeatedly measured the display behaviour, covering the entire signalling repertoire, of individually-tagged wild males on their territories over their lifespans. We quantified patterns of covariation in multiple traits and their relationship with multiple receiver contexts, specifically competitors, mates and predators. We also examined the association between male signalling and indices of lifetime fitness. Males commonly used multiple signals, including behavioural signals and a rare dynamic colour signal. These traits were strongly correlated and seemed largely directed towards females, suggesting that they were primarily maintained as redundant signals through female choice. However, other selection pressures also appeared to be important. One colour trait seemed to be directed at competitors, providing limited support to the multiple receiver hypothesis. Several traits were reduced in the presence of predators, suggesting that they carry the cost of increased predation risk. Thus, multiple selection pressures, primarily female choice and predation risk, appear to affect male signalling. Finally, signalling traits appeared to influence a measure of lifetime reproductive success, providing rare evidence for the biological relevance of signalling traits under natural contexts.

A Secure and Efficient Authentication Technique for Vehicular Ad-Hoc Networks

Vehicular ad-hoc networks (VANETs) are under active development, thanks in part to recent advances in wireless communication and networking technologies. The most fundamental part in VANETs is to enable message authentications between vehicles and roadside units. Message authentication using proxy vehicles has been proposed to reduce the computational overhead of roadside units significantly. In this message authentication scheme, proxy vehicles that verify multiple messages at the same time improve roadside units’ efficiency. In this paper, first we show that the only proxy-based authentication scheme (PBAS) presented for this goal by Liu et al. cannot guarantee message authenticity, and also it is not resistant against impersonation and modification attacks and false acceptance of batched invalid signatures. Next, we propose a new identity-based message authentication scheme using proxy vehicles (ID-MAP). Then, to guarantee that it can satisfy the message authentication requirement, existential unforgeability of underlying signature against adaptively chosen-message and identity attack is proved under elliptic curve discrete logarithm problem in the random oracle model. It should be highlighted that ID-MAP not only is more efficient than PBAS since it is pairing-free and identity-based, and also it does not use map-to-point hash functions, but also it satisfies security and privacy requirements of VANETs. Furthermore, analysis shows that the required time to verify 3000 messages in ID-MAP is reduced by 76% compared to that of PBAS.

Alarm signals in goitered gazelle with special reference to stotting, hissing and alarm urination-defecation

Compared to solitary species, social ungulates benefit from living in groups not only because of the “many eyes effect”, when each individual devotes less time to vigilance and spends more time foraging and engaged in other activities, or of the “dilution effect”, when the probability that any specific individual will be caught decreases with herd size, but also because of early alarm signals produced by conspecifics that provide enough time for a successful escape from predator attack. These signals can contain multiple messages about the category of the predator and the degree of risk. Among them, stotting, alarm calls and alarm urination-defecation acts are distinctive channels of prey-predator and/or prey-prey communications. However, stotting gaits and alarm vocalizations are still subjects of numerous debates on their functionality and to whom they are addressed (predator or conspecifics); in addition, alarm urination-defecation is known for a few ungulate species and until now functional significance of this behavior has stayed elusive. I found that stotting and hissing were used by adult females significantly more often than adult males, and that they displayed these behaviors most often at the end of the hiding period and from 2 to 3 months thereafter. Stotting and alarm hissing are likely mainly used to address conspecifics as well as being used by females to warn and manage their fawns in dangerous situations and to teach them to avoid being preyed upon during the initial time after the hiding period. In contrast, alarm urination-defecation acts were displayed by females and males equally and apart of being pure physiological functions and/or a release the stress from encountering a predator, they likely also had significance as an alarm signal, though this association is poorly explored and needs further investigation.

Fear, Sadness and Hope: Which Emotions Maximize Impact of Anti-Tobacco Mass Media Advertisements among Lower and Higher SES Groups?

Emotive anti-tobacco advertisements can increase quitting. Discrete emotion theories suggest evoking fear may be more effective than sadness; less research has focused on hope. A weekly cross-sectional survey of smokers and recent quitters (N = 7683) measured past-month quit attempts. The main predictor was level of exposure to four different types of anti-tobacco advertisements broadcast in the two months prior to quit attempts: advertisements predominantly evoking fear, sadness, hope, or evoking multiple negative emotions (i.e., fear, guilt, and/or sadness). Greater exposure to fear-evoking advertisements (OR = 2.16, p < .01) increased odds of making a quit attempt and showed similar effectiveness among those in lower and higher SES areas. Greater exposure to advertisements evoking multiple negative emotions increased quit attempts (OR = 1.70, p < .01), but interactions indicated this was driven by those in lower SES, but not higher SES areas. Greater exposure to hope-evoking advertisements enhanced effects of fear-evoking advertisements among those in higher SES, but not lower SES areas. Findings suggest to be maximally effective across the whole population avoid messages evoking sadness and use messages eliciting fear. If the aim is to specifically motivate those living in lower SES areas where smoking rates are higher, multiple negative emotion messages, but not hope-evoking messages, may also be effective.

Preferences for the format of text messages containing results of online screening for sexually transmitted infections: a service evaluation.

We conducted an online survey to examine the preferences for receiving a text message with results of a test for sexually transmitted infections (STIs) as part of online self-sampling service at Solent NHS Trust. Findings showed that if all tests were negative, participants would prefer to receive one text message. However, in the event of a positive result, a large majority (86%) would prefer to receive a separate text with the name of the STI for which the test was positive. Similarly, three-quarters (74%) of participants would prefer to receive multiple texts indicating which test was inconclusive and required an additional sample. The results of this survey support a change of practice to sending multiple text messages with the results of online self-sampling that include the names of STIs.

Verifying Safety Messages Using Relative-Time and Zone Priority in Vehicular Ad Hoc Networks.

In high-density road networks, with each vehicle broadcasting multiple messages per second, the arrival rate of safety messages can easily exceed the rate at which digital signatures can be verified. Since not all messages can be verified, algorithms for selecting which messages to verify are required to ensure that each vehicle receives appropriate awareness about neighbouring vehicles. This paper presents a novel scheme to select important safety messages for verification in vehicular ad hoc networks (VANETs). The proposed scheme uses location and direction of the sender, as well as proximity and relative-time between vehicles, to reduce the number of irrelevant messages verified (i.e., messages from vehicles that are unlikely to cause an accident). Compared with other existing schemes, the analysis results show that the proposed scheme can verify messages from nearby vehicles with lower inter-message delay and reduced packet loss and thus provides high level of awareness of the nearby vehicles.

Secure and Privacy-Preserving Physical-Layer-Assisted Scheme for EV Dynamic Charging System

Dynamic charging system will enable moving electrical vehicles (EVs) to charge their batteries through magnetic induction by charging pads (CPs) placed on a portion of the roadbed. To realize such a system, the EVs need to communicate with the various parts of the system that include a bank, a charging service provider (CSP), road side units (RSUs), and CPs. In this paper, we propose a secure and privacy-preserving physical-layer-assisted scheme for dynamic charging systems to secure payment and authentication and also preserve the drivers' location privacy. We develop an efficient hierarchical authentication scheme that considers the scalability nature of the system. Efficient cryptosystems are used to authenticate the EVs to the bank, CSP, and RSUs, but our evaluations indicate that the contact time of fast moving EVs and the CPs is too short to exchange multiple messages and execute time consuming operations. Therefore, we develop an efficient physical-layer-based authorization scheme that utilizes autocorrelation demodulation and hypothesis testing to enable the CPs to identify and charge the authorized EVs. Through extensive analysis, simulation, and practical experiments, we demonstrate that the proposed scheme is secure against the considered attacks and can achieve fast authentication and high authorization rate. Moreover, the proposed scheme can achieve full anonymity where no entity or even colluding entities can know the drivers' locations.

Enhancing secrecy rates in a wiretap channel

Reliable communication imposes an upper limit on the achievable rate, namely the Shannon capacity. Wyner's wiretap coding ensures a security constraint and reliability, but results in a decrease of achievable rate. To mitigate the loss in secrecy rate, we propose a coding scheme in which we use sufficiently old messages as key and prove that multiple messages are secure with respect to all the information possessed by the eavesdropper. We also show that we can achieve security in the strong sense. Next, we study a fading wiretap channel with full channel state information of the eavesdropper's channel and use our coding/decoding scheme to achieve a secrecy capacity close to the Shannon capacity of the main channel (in the ergodic sense). Finally, we study a case where the transmitter does not have instantaneous information of the channel state of the eavesdropper, but only its distribution.

Broadcasting multiple messages in the 1-in port model in optimal time

In the 1-in port model, every vertex of a synchronous network can receive at most one message in each time unit. We consider simultaneous broadcasting of multiple messages from the same source or from distinct sources in such networks with an additional restriction that every received message can be sent out to neighbors only in the next time unit and never to already informed vertex. We use a general concept of level-disjoint partitions developed for this scenario. Here we introduce a subgraph extension technique for efficient spreading information within this concept. Surprisingly, this approach with so called biwheels leads to simultaneous broadcasting of optimal number of messages on a wide class of graphs in optimal time. In particular, we provide tight results for bipartite tori, meshes, hypercubes, Knodel graphs, circulant graphs. We also propose several open problems and conjectures.