Time Travel Research Articles

Enhancing urban metro system resilience under disruptive events through multi-agent reinforcement learning

With urban rail transit (URT) systems playing an increasingly crucial role in megacity mobility, the rising frequency of service disruptions may pose substantial passenger delays and safety concerns. This emphasizes the need to prioritize resilience enhancements for the URT system. Bus bridging, an effective resilience-enhancing measure, faces challenges that effectively capture the unique features of bridging buses and stranded passengers, and rely on predetermined routes and fixed frequencies, diminishing service flexibility and efficiency in dynamic bridging environments. To overcome these challenges, we propose a novel approach using a multi-agent reinforcement learning model. This model treats bus bridging as a collaborative multi-agent task with the competition. Specifically, it enables bridging buses to adaptively select the next visiting station based on environmental characteristics. Furthermore, a competitive reward function is introduced to facilitate effective collaboration among all agents while preventing malicious competition. The case study results demonstrate that the proposed enhancing resilience method outperforms traditional reinforcement learning method and classic bus bridging strategy and can reduce the average waiting time and average travel time, especially in resource-limited and complex scenarios.

Facing a time crunch: Time poverty and travel behaviour in Canada

Transportation scholars are keenly interested in the relationship between transportation and subjective well-being. To date, this body of scholarship has not addressed feelings of time pressure. We use the time crunch index from Canada's 2015 General Social Survey (GSS) to analyze the role that transportation resources, travel behavior, and social demographics play in respondents’ self-reported experiences of time pressure. We find that resources and daily travel strongly affect the time crunch index and are compounded by the large effect of sociodemographic vulnerability, namely being a woman, immigrant, or member of an ethnic minority, and having a condition of disability. Our analysis presents a new approach for transportation scholars to measure the relationship between social well-being and transportation grounded in several decades of social science research on time use and well-being.

Cosmological constant Petrov type-N space–time in Ricci-inverse gravity

Our focus is on a specific type-N space–time that exhibits closed time-like curves in general relativity theory within the framework of Ricci-inverse gravity model. The matter-energy content is solely composed of a pure radiation field, and it adheres to the energy conditions while featuring a negative cosmological constant. One of the key findings in this investigation is the non-zero determinant of the Ricci tensor (Rμν), which implies the existence of an anti-curvature tensor (Aμν) and, as a consequence, an anti-curvature scalar (A≠R−1). Furthermore, we establish that this type-N space–time serves as a solution within modified gravity theories via the Ricci-inverse model, which involves adjustments to the cosmological constant (Λ) and the energy density (ρ) of the radiation field expressed in terms of a coupling constant. As a result, our findings suggest that causality violations remain possible within the framework of this Ricci-inverse gravity model, alongside the predictions of general relativity.

Presenting Archaeoacoustics Results Using Multimedia and VR Technologies

Abstract Music and sound cannot be experienced through writing and numbers. Writing freezes time onto paper; as a time-based medium, sound cannot be heard without temporal motion, and acoustic metrics are silent data. For a complete experience of sound, it needs to engage our bodies. Digital multimedia technologies offer powerful approaches to understanding the acoustics of the past, and this work will explore a number of those affordances. In particular, this work explores the use of apps that illustrate archaeoacoustic effects, set digitally within visual and acoustic archaeological cultures. The ways of immersing audiences through projection, acoustic simulation, field and studio recordings, and musical performance will be discussed. The use of virtual reality (VR) headsets is explored to create a sense of deep-flow and presence amongst audiences, total immersion in an experiential phenomenological understanding of interacting audio and visual fields, as well as setting such results within an appropriate context. This study will examine how acoustics results at caves in Northern Spain, in various phases of Stonehenge, and at Paphos Theatre (all World Heritage Sites) can be explored using VR and multimedia technologies, evaluating the comparative advantages of the use of different technologies. It proposes that such integration of visual and sonic modelling using interactive digital technologies is effective as a non-representational theory approach to compliment empirical studies, allowing understanding that goes beyond numerical analysis and binary dialectics to engage directly with the material of archaeological sites in an embodied manner, and address the real-world complexities of acoustic ecologies and their contexts.

THE USE OF THE “TIME TRAVEL” PARADIGM OF ALZHEIMER’S DISEASE FOR FAMILY CARE PARTNER EMPOWERMENT

Abstract This study describes how family carers are taught the Time Travel model of Alzheimer’s Disease (AD). As persons with AD experience cognitive, emotional, social, physical and functional time travel, families can learn to join them on their journey. Stage models (e.g., Reisberg and associates FAST and GDS) of AD clarify how changes through time occur using stage markers. Yet the disease is non-linear. Persons with AD don’t travel neatly in stages but fluctuate in recall of names, faces and events. They migrate in a non-linear downward spiral fluctuating back and forth through time, revisiting people, places, events and traumas of their distant past. Time Travel apps and other life history data are available to provide real person-centered care that’s time appropriate. Families are trained to connect in the approximate time frame in which the person has traveled. Hence, care partners are taught time appropriate communication and interventions (e.g., activities, pictures, music etc.) to respond to challenging behaviors. The Models use with family carers empowers them to validate their loved ones’ approximate time frame they are in. Family carers are inspired to become “best friends” of AD persons by understanding how this cognitive disability works. When a lady with travels to age 20 in her mind but sees an 80-year-old face in the mirror, she demands the person leave the bathroom. This behavior is puzzling to families. Time Travel model explains how this works driving care planning, redesigns (e.g., mirrors) and activities, and supports validation therapy, “Best Friends” and other pedagogy.

EAST MEETS WEST: INTERVENTIONS, PRACTICE MODELS, AND POLICIES TO SUPPORT FAMILY CAREGIVERS IN DIVERSE CULTURES

Abstract This East Meets West symposium consists of six studies that examined innovative interventions, practice models and policies designed to support family caregivers of older adults in the U.S., Taiwan, and mainland China. The first two papers both used case management interventions to assist family caregivers with a focus on caregiver depression. The paper from the U.S. found that more difficulties of performing caregiving tasks and less caregiver preparation contributed to higher levels of depression, and the paper from Taiwan found that caregivers who received the case management service reduced depression at four-month and six-month follow-up assessments. The third paper discussed a “time travel” paradigm developed to guide service design and delivery for persons with dementia at different stages. The fourth paper used the state of Michigan as a case to examine service gaps in the current aging service network, and identifies an urgent need for statewide policy renovations to support family caregivers. The fifth and sixth papers both used large secondary data analyses to examine the effects of piloted policy and practice efforts on family caregiver outcomes. One study found that the long-term care insurance programs have resulted in positive caregiver outcomes including reduced caregiving financial cost, time, and physical and psychological burden. The other study found the use of home-based care services reduced adult children caregiver burden and did not affect the relationship between older adults and adult children caregivers. After individual presentations are done, two discussants will summarize shared themes in these papers and provide critical feedback.

Supplemental Material for Spatial Attention Modulation of the Brain Network Involved in Mental Time Travel

Supplemental Material for Spatial Attention Modulation of the Brain Network Involved in Mental Time Travel

Exploring Time Travel Rules in Time Travel Films

Throughout film history, time travel has been an intriguing concept revisited time and again by film productions, creating a universe of time travel principles and becoming a discipline of scientific import. With some of the greatest minds and thinkers of our time contributing to the living discourse, time travel has gained global significance and has developed several rules films attempt to follow. Time travel theory postulates several theories concerning the effect of an individual traveling through time and coming into contact with themselves; some benign, some many catastrophic. This study reviews time travel films to determine the cinematic consistency of three of these rules; the grandfather paradox, time-traveling for self-benefit, and meeting oneself in an alternate time.

Population level behavioural responses to variation in habitat quality across multiple locations in a fragmented landscape

Population level behavioural responses to variation in habitat quality across multiple locations in a fragmented landscape

Spatial feature embedding for robust visual object tracking

AbstractRecently, the offline‐trained Siamese pipeline has drawn wide attention due to its outstanding tracking performance. However, the existing Siamese trackers utilise offline training to extract ‘universal’ features, which is insufficient to effectively distinguish between the target and fluctuating interference in embedding the information of the two branches, leading to inaccurate classification and localisation. In addition, the Siamese trackers employ a pre‐defined scale for cropping the search candidate region based on the previous frame's result, which might easily introduce redundant background noise (clutter, similar objects etc.), affecting the tracker's robustness. To solve these problems, the authors propose two novel sub‐network spatial employed to spatial feature embedding for robust object tracking. Specifically, the proposed spatial remapping (SRM) network enhances the feature discrepancy between target and distractor categories by online remapping, and improves the discriminant ability of the tracker on the embedding space. The MAML is used to optimise the SRM network to ensure its adaptability to complex tracking scenarios. Moreover, a temporal information proposal‐guided (TPG) network that utilises a GRU model to dynamically predict the search scale based on temporal motion states to reduce potential background interference is introduced. The proposed two network is integrated into two popular trackers, namely SiamFC++ and TransT, which achieve superior performance on six challenging benchmarks, including OTB100, VOT2019, UAV123, GOT10K, TrackingNet and LaSOT, TrackingNet and LaSOT denoting them as SiamSRMC and SiamSRMT, respectively. Moreover, the proposed trackers obtain competitive tracking performance compared with the state‐of‐the‐art trackers in the attribute of background clutter and similar object, validating the effectiveness of our method.

An empirical investigation of the distribution of travellers’ willingness-to-pay: A comparison between a parametric and nonparametric approach

Understanding the distribution of the willingness-to-pay (WTP) to reduce travel time or other unpleasant travel attributes experienced by travellers is crucial to making well-informed choices about infrastructure investments and the pricing of services. Given multimodality, heavy tails, and the impact of averaging errors in the classical parametric distribution-based analysis of WTP, this study compares WTP distributions across six distinct datasets using a range of model specifications, including multinomial logit (MNL), mixed logit (MMNL) and nonparametric logit mixed logit (LML). The models are estimated directly in willingness-to-pay space, highlighting that WTP is not uniformly distributed with a high likelihood of having a multi-modal distribution across the population. The findings confirm the intuition on the presence of negative WTP for some undesirable travel attributes. This study raises awareness among transport researchers, modellers, and authorities about using the correct WTP distributions in practice. It adds some empirical evidence regarding the true underlying WTP distribution of various travel attributes to the transport literature.

The Close Possibility of Time Travel

The Close Possibility of Time Travel

Cartographic time travel: Reflecting the past, defining the present, and challenging the future using old maps

This introductory article of the special issue of Acta geographica Slovenica on old maps examines the importance of old maps as the foundation and culmination of geographical research. Maps, one of the earliest languages of communication, have guided exploration and become reference documents. Old maps reveal history, values, and contexts of geographical regions and geographical science. They serve as a special form of text, making possible communication across centuries. Old maps have inspired fantasy maps that depict fictional landscapes and create a cultural phenomenon. This special issue contains articles that analyze the cartographic elements of old maps, the semiotics of old maps, their use in education, and their historical significance, as well as an article on the first Slovenian atlas. Old maps challenge geographic knowledge and representation, and they are shaping the digital future.

Stochastic analysis of the seismic performance of sheet-pile walls supporting heterogeneous liquefiable ground

This paper presents the findings of a stochastic analysis conducted to evaluate the effects of the spatial soil variability and temporal base motion variability on the seismic response of sheet pile walls supporting liquefiable ground. A random finite element analysis is used to model the centrifuge experiment performed during the 2020 phase of the Liquefaction Experiments and Analysis Project (LEAP). The relative density of the main soil deposit in the LEAP-2020 experiments ranged from 50 to 75 %. In this study the spatial variability of each centrifuge model was determined from the inflight cone penetration tests (CPT) performed before the shaking phase in each experiment. The vertical spatial correlation length was directly determined from the CPT measurements, while the mean and coefficient of variation of the soil relative density were obtained from an empirical relationship correlating the cone tip resistance with the relative density. The variability observed in the achieved base motions for the LEAP-2020 centrifuge experiments was modeled by generating synthetic base motion time histories that matched the variability observed in the response spectra of the achieved base motions. The results obtained from this analysis shed light on the effects of the base motion variability and soil density on the excess pore pressure development and the triggering of soil liquefaction. It also provides an understanding on the sensitivity of the wall lateral displacement to such variabilities. The observed variability in the simulation response is compared with the variability observed in the centrifuge experiments. This comparison is used to evaluate the capability of the current numerical simulation tools in modeling the variability in the wall response.

The Economics of Time Travel

The lack of time travellers visiting us may be seen as evidence that time travel is not possible. In this article, I argue an alternative explanation is that we are not economically important enough to our descendants to justify the costs of time travel. Using a cost-benefit analysis, I elaborate on this argument. I suggest that the major cost of time travel is likely to be the energy cost, whilst the largest benefit of time travel is knowledge which the present possesses, but the future has lost. Focusing on this benefit, I argue it is extremely unlikely that we possess a piece of knowledge which is sufficiently important to a future civilisation (system critical), but also has been lost by said civilisation. This is to say, we may not have been visited by time travellers because we are not important enough.

Message in a Bottle—An Update to the Golden Record: 1. Objectives and Key Content of the Message

AbstractIn the first part of this series, we delve into the foundational aspects of “Message in a Bottle (MIAB)” (henceforth referred to as MIAB). This study builds upon the legacy of the Voyager Golden Records, launched aboard Voyager 1 and 2 in 1977, which aimed to communicate with intelligent species beyond our world. These records not only offer a snapshot of Earth and human civilization but also represent our desire to establish contact with advanced alien civilizations. Given the absence of mutually understood signs, symbols, and semiotic conventions, MIAB, like its predecessor, uses scientific methods to design an innovative means of communication that encapsulates the story of humanity. Our goal is to share our collective knowledge, emotions, innovations, and aspirations in a way that provides a universal, yet contextually relevant, understanding of human society, the evolution of life on Earth, and our hopes and concerns for the future. Through this time and space traveling capsule, we also strive to inspire and unify current and future generations to celebrate and safeguard our shared human experience.

Scene construction and autobiographical memory retrieval in autism spectrum disorder.

Individuals with autism spectrum disorder (ASD) frequently exhibit difficulties in retrieving autobiographical memories (AMs) of specific events from their life. Such memory deficits are frequently attributed to underlying disruptions in self-referential or social cognition processes. This makes intuitive sense as these are hallmarks of ASD. However, an emerging literature suggests that parallel deficits also exist in ASD individuals' ability to reconstruct the rich spatial contexts in which events occur. This is a capacity known as scene construction, and in typically developing individuals is considered a core process in retrieving AMs. In this review, we discuss evidence of difficulties with scene construction in ASD, drawing upon experiments that involve AM retrieval, other forms of mental time travel, and spatial navigation. We also highlight aspects of extant data that cannot be accounted for using purely social explanations of memory deficits in ASD. We conclude by identifying key questions raised by our framework and suggest how they might be addressed in future research.

A Symbolic Hierarchy of Places: Global Inequalities in Tourism Narratives of the New York Times Travel Section

We study the symbolic value of places using the case of global tourism where places are explicitly objectified for valorization. Unlike most prior research that uses tangible measurements like UNESCO's World Heritage Sites for global comparison of place-based symbolic values, we harness the power of computational text analysis to measure the symbolic value of places based on travel writings of the New York Times Travel Section. Our results demonstrate that there is a symbolic hierarchy among places depending on the various meanings of culture and nature and the degree of engagement with either topic. NYT travel writers valorize European regions for cultural tourism according to the broadest meanings of culture, and often engage with the region's history as a main topic of the travel article. However, other regions – particularly the ones with legacies of past colonization – are valorized for their nature's scenic beauty while obscuring the significance of their “cultural” values. Even when a place's “cultural” values are recognized, the meanings of culture tend to be limited in non-European regions. Our findings have implications for the enduring symbolic inequality of places at the global level.

Time-travel to “A review and proposal for a model of sensory predictability in auditory language perception”

Since its inception 60 years ago, the mission of Cortex has been to foster a better understanding of cognition and the relationship between the nervous system, behavior in general, and mental processes in particular. Almost 15 years ago, we submitted “a review and proposal” along these lines to the journal, in which we sought to integrate two components that are not often discussed together, namely the basal ganglia and syntactic language functions (Kotz et al., 2009). One of the main motivations was to find potential explanations for two relatively straightforward earlier empirical observations: (i) electroencephalographic event-related potential responses (EEG/ERPs) known to be sensitive markers of syntactic violations in auditory language processing were found to be absent in persons with focal basal ganglia lesions (Friederici et al., 1999; Frisch et al., 2003; Kotz et al., 2003), and (ii) temporally regular rhythmic tone sequences presented before language stimuli were found to compensate for this effect (Kotz et al., 2005; Kotz & Gunter, 2015; Kotz & Schmidt-Kassow, 2015). The critical question was how to reconcile these specific components, the basal ganglia typically associated with motor behavior and language-related syntactic processes, under one hood to foster a better understanding of how the basal ganglia system contributes to auditory language processing. This core question was the starting point for further own research and trying to solve it, unsurprisingly, led to many more questions and rather few answers. It also changed perspectives and established collaborative efforts, sometimes in unsuspected ways and directions. In light of the journal’s anniversary, we therefore want to take this exciting opportunity for some time travel, looking back at our original conception while linking it to more recent considerations, thereby providing some insights that might be useful for future research.

Digital Pupillometry and Centroid Shift Changes in Dominant and Nondominant Eyes.

To investigate the differences between dominant and nondominant eyes in a predominantly young patient population by analyzing the angle kappa, pupil size, and center position in dominant and nondominant eyes. A total of 126 young college students (252 eyes) with myopia who underwent femtosecond laser-combined LASIK were randomly selected. Ocular dominance was determined using the hole-in-card test. The WaveLight Allegro Topolyzer (WaveLight Laser Technologies AG, Erlangen, Germany) was used to measure the pupil size and center position. The offset between the pupil center and the coaxially sighted corneal light reflex (P-Dist) of the patients was recorded by the x- and y-axis eyeball tracking adjustment program of the WaveLight Eagle Vision EX500 excimer laser system (Wavelight GmbH). The patient's vision (uncorrected distance visual acuity [UDVA], best-corrected visual acuity (BCVA), and refractive power (spherical equivalent, SE) were observed preoperatively, 1 week, 4 weeks, and 12 weeks postoperatively, and a quality of vision (QoV) questionnaire was completed. Ocular dominance occurred predominantly in the right eye [right vs. left: (178) 70.63% vs. (74) 29.37%; p < 0.001]. The P-Dist was 0.202 ± 0.095 mm in the dominant eye and 0.215 ± 0.103 mm in the nondominant eye (p = 0.021). The horizontal pupil shift was - 0.07 ± 0.14 mm in dominant eyes and 0.01 ± 0.13 mm in nondominant eyes (p = 0.001) (the temporal displacement of the dominant eye under mesopic conditions). The SE was negatively correlated with the P-Dist (r = - 0.223, p = 0.012 for the dominant eye and r = - 0.199, p = 0.025 for the nondominant eye). At 12weeks postoperatively, the safety index (postoperative BDVA/preoperative BDVA) of the dominant and nondominant eyes was 1.20 (1.00, 1.22) and 1.20 (1.00, 1.20), respectively, and the efficacy index (postoperative UDVA/preoperative BDVA) was 1.00 (1.00, 1.20) and 1.00 (1.00, 1.20), respectively; the proportion of residual SE within ± 0.50 D was 98 and 100%, respectively. This study found that ocular dominance occurred predominantly in the right eye. The pupil size change was larger in the dominant eye. The angle kappa of the dominant eye was smaller than that of the nondominant eye and the pupil center of the dominant eye was slightly shifted to the temporal side under mesopic conditions. The correction of myopia in the dominant and nondominant eyes exhibits good safety, efficacy, and predictability in the short term after surgery, and has good subjective visual quality performance after correction. We suggest adjusting the angle kappa percentage in the dominant eye to be lower than that of the nondominant eye in individualized corneal refractive surgery in order to find the ablation center closest to the visual axis.