Local Memory Research Articles

Fast Loosely-Timed Deep Neural Network Models with Accurate Memory Contention

The emergence of data-intensive applications, such as Deep Neural Networks (DNN), exacerbates the well-known memory bottleneck in computer systems and demands early attention in the design flow. Electronic System-Level (ESL) design using SystemC Transaction Level Modeling (TLM) enables effective performance estimation, design space exploration (DSE), and gradual refinement. However, memory contention is often only detectable after detailed TLM-2.0 approximately-timed or cycle-accurate RTL models are developed. A memory bottleneck detected at such a late stage can severely limit the available design choices or even require costly redesign. In this work, we propose a novel TLM-2.0 loosely-timed contention-aware (LT-CA) modeling style that offers high-speed simulation close to traditional loosely-timed (LT) models, yet shows the same accuracy for memory contention as low-level approximately-timed (AT) models. Thus, our proposed LT-CA modeling breaks the speed/accuracy tradeoff between regular LT and AT models and offers fast and accurate observation and visualization of memory contention. Our extensible SystemC model generator automatically produces desired TLM-1 and TLM-2.0 models from a DNN architecture description for design space exploration focusing on memory contention. We demonstrate our approach with a real-world industry-strength DNN application, GoogLeNet. The experimental results show that the proposed LT-CA modeling is 46× faster in simulation than equivalent AT models with an average error of less than 1% in simulated time. Early detection of memory contentions also suggests that local memories close to computing cores can eliminate memory contention in such applications.

Forensic analysis of web browsers lifecycle: A case study

The widespread integration of the internet into daily life across sectors such as healthcare, education, business, and entertainment has led to an increasing dependence on web applications. However, inherent technological vulnerabilities attract cybercriminals, necessitating robust security measures. While these security measures, including frequent updates/fixes to applications and operating systems, are essential, they also complicate forensic investigations. This research proposes a comprehensive approach to artifact identification and collection for examining browsing activities of Firefox, Chrome, and Edge on Windows 11. The methodology includes setting up and analyzing all stages of browser usage, such as installations, executions, uninstallations, and anomalous behaviors like crashes and restarts. Simulated cyber-criminal activities are used to collect artifacts at each stage, which are then analyzed using Windows 11 components such as the registry, memory, storage, and log locations. Experimental results reveal vulnerabilities, such as crashes, that can lead to the loss of sensitive information. This methodology provides a promising foundation for advancing browser forensic analysis and enhancing cybercrime investigations.

The weekend warrior effect: Consistent intermittent exercise induces persistent cognitive benefits

Exercise provides a range of cognitive benefits, including improved memory performance. Previously, we demonstrated that 14 days of continuous voluntary wheel-running exercise enables learning in a hippocampus-dependent Object Location Memory (OLM) task under insufficient, subthreshold training conditions in adult mice. Whether similar exercise benefits can be obtained from consistent intermittent exercise as continuous exercise is unknown. Here, we examine whether intermittent exercise (the weekend warrior effect: 2 days of exercise a week for 7 weeks) displays similar or distinct cognitive benefits as previously examined with 14 days of continuous exercise. We find that both continuous and intermittent exercise parameters similarly enable hippocampus-dependent OLM compared to the 2-day exercise control group. Mice receiving intermittent exercise maintained cognitive benefits following a 7-day sedentary delay, whereas mice that underwent 14 continuous days of exercise showed diminished cognitive benefits as previously reported. Further, compared to continuous exercise, intermittent exercise mice exhibited persistently elevated levels of the genes Acvr1c and Bdnf which we know to be critically involved in hippocampus-dependent long-term memory in the dorsal hippocampus. Together findings suggest that consistent intermittent exercise persistently enables hippocampal-dependent long-term memory. Understanding the optimal parameters for persistent cognitive function and the mechanisms mediating persistent effects will aid in therapeutic pursuits investigating the mitigation of cognitive ailments.

Spatial patterns of historical and cultural blocks based on multisource data and protection and development strategies within the context of urban renewal: a case study of Xi’an, China

As global urbanisation accelerates, historical and cultural blocks, the treasures of cultural heritage, hold great significance for urban development. Previous studies mainly focused on spatial patterns of such blocks through space syntax, street accessibility, and local memory. A greater focus on quantitative spatial patterns and tailored preservation and development strategies is needed, especially in northwestern Chinese cities. This study focused on Xi’an, China’s ancient capital, using global Moran’s I, kernel density analysis, standard deviation ellipse and other methods to reveal the spatial distribution of historical and cultural blocks. The findings indicated a northeast- and southwest-trending clustered distribution with varying density, a central core, and multiple nodes. To maintain the integrity of Xi’an’s historical and cultural blocks, scholars recommended critical commercialisation assessment, cultural identity reinforcement, infrastructure enhancement, and harmonisation with the surrounding landscape. The results provide novel strategies for the sustainable development of Xi’an and serve as crucial references for protecting similar districts worldwide.

Association between adolescent alcohol use and cognitive function in young adulthood: A co-twin comparison study.

Studies on adolescent alcohol use and cognition are often unable to separate the potential causal effects of alcohol use on cognition from shared etiological influences, including genetic influences or other substance use comorbidities also known to be associated with cognition, such as nicotine use. The present study aimed to fill this gap and clarify the relationship between adolescent alcohol use and young adult cognition by accounting for both measured and unmeasured confounders. A random effects model accounting for nesting in families was used to control for measured confounders. Next, co-twin comparisons were conducted within the full sample and in monozygotic twin pairs (MZ) to control for unmeasured genetic and environmental confounders shared by co-twins. Participants were 812 individuals (58.6% female, 361 complete pairs, 146 MZ pairs) from the longitudinal FinnTwin12 study in Finland. Adolescent alcohol use was indexed with measures of frequency of use and intoxication averaged across ages 14 and 17. Cognitive outcomes were measured at average age 22 and included Trail Making Test, California Stroop test, Wechsler Adult Intelligence subtests (Vocabulary, Block Design, Digit Symbol), Digit Span subtest of Wechsler Memory Scale, Mental Rotation Test and Object Location Memory test. Covariates included sex, parental education, general cognitive ability, current alcohol use and nicotine use. Greater frequency of alcohol use and frequency of intoxication across adolescence was associated with decreased vocabulary scores in the co-twin control [freq: stnd beta = -0.12, 95% confidence interval (CI) = -0.234, -0.013] and MZ only co-twin control models (freq: stnd beta = -0.305, 95% CI = -0.523, -0.087; intox: stnd beta = -0.301, 95% CI = -0.528, -0.074). In Finland, there appears to be little evidence that adolescent alcohol use causes cognitive deficits in young adulthood, except modest evidence for association of higher adolescent alcohol use with lower young adult vocabulary scores.

MapReduce algorithms for robust center-based clustering in doubling metrics

Clustering is a pivotal primitive for unsupervised learning and data analysis. A popular variant is the (k,ℓ)-clustering problem, where, given a pointset P from a metric space, one must determine a subset S of k centers minimizing the sum of the ℓ-th powers of the distances of points in P from their closest centers. This formulation covers the well-studied k-median (ℓ=1) and k-means (ℓ=2) clustering problems. A more general variant, introduced to deal with noisy pointsets, features a further parameter z and allows up to z points of P (outliers) to be disregarded when computing the sum. We present a distributed coreset-based 3-round approximation algorithm for the (k,ℓ)-clustering problem with z outliers, using MapReduce as a computational model. An important feature of our algorithm is that it obliviously adapts to the intrinsic complexity of the dataset, captured by its doubling dimension D. Remarkably, for D=O(1), our algorithm requires sublinear local memory per reducer, and yields a solution whose approximation ratio is an additive term O(γ) away from the one achievable by the best known sequential (possibly bicriteria) algorithm, where γ can be made arbitrarily small. To the best of our knowledge, no previous distributed approaches were able to attain similar quality-performance tradeoffs for metrics with constant doubling dimension.

Immunological memory diversity in the human upper airway.

The upper airway is an important site of infection, butimmune memory in the human upper airway is poorly understood, with implications for COVID-19 and many other human diseases1-4. Here we demonstrate that nasal and nasopharyngeal swabs can be used to obtain insights into these challenging problems, and define distinct immune cell populations, including antigen-specific memory Bcells and T cells, in two adjacent anatomical sites in the upper airway. Upper airway immune cell populations seemed stable over time in healthy adults undergoing monthly swabs for more than 1 year, and prominent tissue resident memory T (TRM)cell and B (BRM) cellpopulations were defined. Unexpectedly, germinal centre cells were identified consistently in many nasopharyngeal swabs. In subjects with SARS-CoV-2 breakthrough infections, local virus-specific BRMcells, plasma cells and germinal centre B cells were identified, with evidence of local priming and an enrichment of IgA+ memory B cells in upper airway compartments compared with blood. Local plasma cell populations were identified with transcriptional profiles of longevity. Local virus-specific memory CD4+ TRM cellsand CD8+ TRM cellswere identified, with diverse additional virus-specific T cells. Age-dependent upper airway immunological shifts were observed. These findings provide new understanding of immune memory at a principal mucosal barrier tissue in humans.

Semantic meaning enhances feature-binding but not quantity or precision of locations in visual working memory.

Recent studies showed that real-world items are better remembered in visual working memory (VWM) than visually similar stimuli that are stripped of their semantic meaning. However, the exact nature of this advantage remains unclear. We used meaningful and meaningless stimuli in a location-reproduction VWM task. Employing a mixture-modeling analysis, we examined whether semantic meaning enables more item locations to be remembered, whether it improves the precision of the locations stored in memory, or whether it improves binding between the specific items and their locations. Participants were presented with streams of four (Experiments 1 & 2) or six (Experiment 3) real-world items, or their scrambled, meaningless counterparts. Each item was presented at a unique location, and the task was to reproduce one item's location. Overall, location memory was consistently better for real-world items compared with their scrambled counterparts. Furthermore, the results revealed that participants were less likely to make swap errors for the meaningful items, but there was no effect of conceptual meaning on the guess rate or the precision of the report. In line with previous findings, these results indicate that conceptual meaning enhances VWM for arbitrary stimulus properties such as item location, and this improvement is primarily due to a more efficient identity-location binding rather than an increase in the quantity or quality (precision) of the locations held in memory.

Gathering, agriculture, and exchange: an ethnoecological approach to the study of food patterns and feedstuff sources in communities of the Central Andes, Peru

BackgroundHistorically, the Andean people have experienced uncertainty in terms of the availability of food resources because of climatic and ecological variations that are typical of mountainous environments. Risk management strategies, including the diversified and complementary use and management of species and ecosystems at different elevations, have faced such uncertainty. The current effects of climate change on food security motivate studies on subsistence adaptative strategies. TEK offers extraordinary experience and local biocultural memory to meet present and future needs. From an ethnoecological perspective, we aim to identify the variety of local foods in Andean communities, their cultural and nutritional value for local people, their use frequencies, and their forms to obtain them from different environments, productive systems, and interchanges. We expected to identify traditional Andean diversified subsistence patterns despite the pressure of modern food and interchange systems.MethodsThis study was conducted in two communities in the highlands of the Department of Huánuco, Peru. We conducted 24 semistructured interviews with households sampled through the snowball method. We asked about their daily life food, plant and animal components of diet, frequencies and seasons in which they are consumed, and ways to obtain them. We complemented the information through ethnobotanical collection of wild, weedy, and ruderal edible plants and records on domestic and wild animals included in the diet.ResultsWe recorded 37 crop species, 13 domestic animals, 151 wild, weedy, and ruderal food plant species, the 3 most commonly consumed wild animals, and 52 processed products obtained from local stores and markets. The main crops are potato and maize, while the main domestic animals included in the diet are cattle, pigs, and sheep. Rice, pasta, and bread are the main raw and processed foods included in the diet. Crops represent nearly half of the food consumed and purchased (in kg/year), and tubers and cereals provide most of the kilocalories, carbohydrates and proteins. Wild, weedy, and ruderal plants are consumed in relatively low amounts and at relatively low frequencies per species, but overall, they constitute a significant proportion of the kg of annually consumed food (14.4% in Cani and 9.6% in Monte Azul). Knowledge and use of these resources play a key role in local cuisine and nutrition.ConclusionThe current food patterns studied are based on diverse diets, including multiple feedstuffs, sources, and practices to obtain them, which reflects the traditional Andean subsistence pattern. The increasing adoption of processed food has influenced the declining consumption of local food, mainly among young people. Communication and policies to promote local food, emphasizing the role of wild plants and their adequate consumption, and provide information on their nutritional value are recommended to support efforts toward food sovereignty and conservation of Andean biocultural diversity.

Local Australian memory activism and the fast and slow violence of institutional abuse

ABSTRACT This article investigates unofficial memory projects that have arisen in Australia in response to the institutional abuse of children. While the role of activists in pushing for the enactment of state responses is beginning to be understood, activist demands for recognition have taken a multitude of forms beyond this. Unofficial memory projects are indicative of this, exemplified by a diverse range of publicly situated cultural forms that re-present abuse to wider audiences. Focusing on two examples that have arisen in Australia in recent years – the grassroots phenomenon known as Loud Fence that grew out of the Victorian town of Ballarat, and the Australian Orphanage Museum that was established by Care leavers in 2023 – I examine these as examples of memory activism which generate counter-archives of institutional violence against children. Loud Fence does so upon institutional fences at the level of the streetscape, while the AOM does so by curating a museum space that honours the experiences of childhood ‘Care’. Seeking to decentre the state from this analysis, I demonstrate how such examples enliven the fast and slow violence of child abuse and neglect, and the role of non-state actors when it comes to the recalibration of collective memory.

Memory under existential judgement of a heritage: Laranjeiras Campus of Federal University of Sergipe

More than discussing positive and negative aspects of interventions in the urban landscape, this paper seeks to provoke agents who work to preserve material cultural heritage. Why does the implemented Campus in the city of Laranjeiras by the Federal University of Sergipe, in 2007, not assert itself as an existential locus? This critical reflection presents the project and work carried out by the Monumenta Program to install the Campus and its virtues and deficiencies in relation to the theory of conservation and restoration. The existential crises along 16 years of existence include sensitive conflicts between university and local community, a reduction in the number of implemented courses to just three of them, and so on. A hypothesis is proposed that an intervention project that seeks the “restoration” of a historic building cannot avoid understanding and assimilating local memory, this paper looks for to reveal the causes, conceptions and practices that contribute to answering the mentioned question, thinkin about the disconnection of the process of “conservation and restoration” interventions from the memory of a society, which maybe culminate in the existential refusal of the implanted object and, consequently, of the heritage it represents.

Horizontal Sound Localization and Spatial Short-Term Memory Span in Hearing-Impaired Listeners and Listeners With Simulated Hearing Loss.

Localization of a sound source in the horizontal plane depends on the listener's interaural comparison of arrival time and level. Hearing loss (HL) can reduce access to these binaural cues, possibly disrupting the localization and memory of spatial information. Thus, this study aimed to investigate the horizontal sound localization performance and the spatial short-term memory in listeners with actual and simulated HL. Seventeen listeners with bilateral symmetric HL and 17 listeners with normal hearing (NH) participated in the study. The hearing thresholds of NH listeners were elevated by a spectrally shaped masking noise for the simulations of unilateral hearing loss (UHL) and bilateral hearing loss (BHL). The localization accuracy and errors as well as the spatial short-term memory span were measured in the free field using a set of 11 loudspeakers arrayed over a 150° arc. The localization abilities and spatial short-term memory span did not significantly differ between actual BHL listeners and BHL-simulated NH listeners. Overall, the localization performance with the UHL simulation was approximately twofold worse than that with the BHL simulation, and the hearing asymmetry led to a detrimental effect on spatial memory. The mean localization score as a function of stimulus location in the UHL simulation was less than 30% even for the front (0° azimuth) stimuli and much worse on the side closer to the simulated ear. In the UHL simulation, the localization responses were biased toward the side of the intact ear even when sounds were coming from the front. Hearing asymmetry induced by the UHL simulation substantially disrupted the localization performance and recall abilities of spatial positions encoded and stored in the memory, due to fewer chances to learn strategies to improve localization. The marked effect of hearing asymmetry on sound localization highlights the need for clinical assessments of spatial hearing in addition to conventional hearing tests.

Concretely Mapped Symbolic Memory Locations for Memory Error Detection

Concretely Mapped Symbolic Memory Locations for Memory Error Detection

Load Balanced PIM-Based Graph Processing

Graph processing is widely used for many modern applications, such as social networks, recommendation systems, and knowledge graphs. However, processing large-scale graphs on traditional Von Neumann architectures is challenging due to the irregular graph data and memory-bound graph algorithms. Processing-in-memory (PIM) architecture has emerged as a promising approach for accelerating graph processing by enabling computation to be performed directly on memory. Despite having many processing units and high local memory bandwidth, PIM often suffers from insufficient global communication bandwidth and high synchronization overhead due to load imbalance. This article proposes GraphB, a novel PIM-based graph processing system, to address all these issues. From the algorithm perspective, we propose a degree-aware graph partitioning algorithm that can generate balanced partitioning at a low cost. From the architecture perspective, we introduce tile buffers incorporated with an on-chip 2D-Mesh, which provides high bandwidth for inter-node data transfer. Dataflow in GraphB is designed to enable computation–communication overlap and dynamic load balancing. In a PyMTL3-based cycle-accurate simulator with five real-world graphs and three common algorithms, GraphB achieves an average 2.2× and maximum 2.8× speedup compared to the SOTA PIM-based graph processing system GraphQ.

ASPECTS OF FRENCH IDENTITY THROUGH THE PRISM OF LANGUAGE (USING THE EXAMPLE OF THE EVOLUTION OF THE LEXEMES PAYS-PAYSAGES-TERROIRS-VILLAGES)

The article is devoted to the designations in the language of cultural references that form and reflect the sense of identity of its bearers. Among them is the image of “your own space”, which is marked and formed with the help of special words related to both language and culture. Taking into account the works of F. Brodel, P. Nora, R.A. Budagov, L. Febvre, A. Rey, M. Ozouf, etc., the concept of “force-words” (mots-force / lieux de force), having a long history, reflecting the culture and values of the collective, possessing emotional power and historically changeable, is substantiated. On the material of dictionaries, scientific, science fiction and fiction texts, Internet sites, two poles of representations of the Frenchmen about themselves are established. The first is marked by lexemes associated with civil society (Patrie - Nation - Etat / Nation, Contract, Drapeau; République). The second one is reconstructed in the article on the basis of the lexemes Pays, Paysages, Terroirs, Villages, Langues (plural) and is associated with the values of private life, the idea of the native land, local and family memory. Using the example of these lexemes, it is revealed that the nature of force words and the direction of their development are not data once and for all: in some circumstances, the identifying function of the word develops, in others, the force word weakens and loses its emotional impact and ability to be an identity marker.

Theta-phase locking of single neurons during human spatial memory.

The precise timing of single-neuron activity in relation to local field potentials may support various cognitive functions. Extensive research in rodents, along with some evidence in humans, suggests that single-neuron activity at specific phases of theta oscillations plays a crucial role in memory processes. Our fundamental understanding of such theta-phase locking in humans and its dependency on basic electrophysiological properties of the local field potential is still limited, however. Here, using single-neuron recordings in epilepsy patients performing a spatial memory task, we thus aimed at improving our understanding of factors modulating theta-phase locking in the human brain. Combining a generalized-phase approach for frequency-adaptive theta-phase estimation with time-resolved spectral parameterization, our results show that theta-phase locking is a strong and prevalent phenomenon across human medial temporal lobe regions, both during spatial memory encoding and retrieval. Neuronal theta-phase locking increased during periods of elevated theta power, when clear theta oscillations were present, and when aperiodic activity exhibited steeper slopes. Theta-phase locking was similarly strong during successful and unsuccessful memory, and most neurons activated at similar theta phases between encoding and retrieval. Some neurons changed their preferred theta phases between encoding and retrieval, in line with the idea that different memory processes are separated within the theta cycle. Together, these results help disentangle how different properties of local field potentials and memory states influence theta-phase locking of human single neurons. This contributes to a better understanding of how interactions between single neurons and local field potentials may support human spatial memory.

From Narratives to Monuments: Symbolic Transformation of the Cultural Landscape of the Kaliningrad Region

The article is based on the materials of field research conducted in the Kaliningrad region in 2022–2023. The authors proceed from the idea of this region as a frontier emerged due to redefinition of jurisdiction of the territories of East Prussia after World War II and geopolitical transformations after 1991. Currently, the region is surrounded by EU countries, and this predetermines its perception as a civilizational frontier – a space of comparison between Russian and European ways of life, and intensified the politicization of local historical memory. The aim of the article is to examine the narratives underlying visual transformation of the cultural landscape of the Kaliningrad region since 1945, their relation to the tasks of de-actualization of the region’s past, appropriation of German heritage and its integration into the Russian cultural space. Cultural landscape is defined both as a product and environment of human activity saturated with a variety of artifacts, and as a sign system that forms, preserves, and controls a certain vision of the world. The use of the semiotic paradigm allowed us to consider monuments as its long-term semantic accents. We also took into account the multiplicity of actors influencing the organization and reorganization of the cultural landscape, the variability of the correlation of political forces and opportunities, and the participation in the transformation processes of both power institutions that limit the possibility of alternative perception of reality, and society that resists ideological programming. The evolution of semantic dominants of the cultural landscape we analyzed in the context of shifts in the ideology and attitudes of regional society. We conclude that the compromise tactics of appropriation of the region’s past, developed over time, are based on countering the challenges of the time and solving practical problems, rather than on political attitudes.

Private museum as public space: Local remembering and memory politics in Yan’an, China

Private museum as public space: Local remembering and memory politics in Yan’an, China

Audit of Quality of General Practitioner (GP) Referrals to a Local Memory Service in South Sefton

Audit of Quality of General Practitioner (GP) Referrals to a Local Memory Service in South Sefton

Spatiotemporal structure of foraging and path integration errors by fiddler crabs, Leptuca pugilator

Path integration is the navigational process by which animals construct a memory of a previous location by continuously measuring and summing their movements to form a single home vector pointing to the starting location. It is intrinsically error prone, subject to random errors and, potentially, to systematic errors in either measurement or the summing algorithm. Both types of errors lead to an incorrect vector memory and thus to an error in homing. Because the errors are incurred when animals move, they are theoretically predictable from the movements. We analyzed the behavior of fiddler crabs (Leptuca pugilator) as they performed foraging excursions followed by homing with varying degrees of error. From video recordings we measured body orientations and locations and computed these spatiotemporal path characteristics: duration, distance, turns, bearing and arc sector. These were analyzed for their effect on, separately, the magnitude, and the direction, of crabs’ homing error. The magnitude of the homing error was predicted by arc sector, Δbearing and path length, and several interactions. The direction of the homing error was predicted by interactions including arc sector x Δbearing, arc sector x turns, and Δbearing x turns. Covariance among these factors results in a path that traces a large arc while maintaining body orientation toward the burrow direction and leads to an error with the same clockwise/counterclockwise sign as the arc and the body turns. These results place L. pugilator’s path integration mechanism among others with known systematic errors.