Multi-tier System Research Articles

Multi-Tier Hybrid Offloading for Computation-Aware IoT Applications in Civil Aircraft-Augmented SAGIN

Satellites and civil aircrafts (CAs) with computing ability are valuable access platforms, making it possible for Internet of Things (IoT) devices to offload their computation-intensive tasks in remote areas without network infrastructures. Unlike existing works mainly focused on the static scenarios or the interaction between any two types of local, edge and cloud nodes, we propose an innovative multi-tier hybrid parallel computation architecture in CA-augmented space-air-ground integrated networks (CAA-SAGIN). Specifically, devices perform local computing, CAs and satellites act as edge servers, and ground stations of satellite networks operate cloud computing. Aiming to minimize the weighted sum of end-to-end (E2E) delay and energy consumption, we formulate a partial computation offloading problem by jointly considering access strategy, transmit power, computing resource allocation, offloading ratio and delay tolerance. The platform selection exists both within and between layers, and there are inner- and inter-coupling relationships between communication and computing resources. The issue is solved by the proposed multi-tier partial task offloading (MPTO) algorithm. The original problem is firstly decomposed into primal and master subproblems by generalized benders decomposition (GBD) method, and parallel successive convex approximation (SCA) theory is utilized to transform the multi-variable NP-hard master problem into a convex one. Simulation results demonstrate the convergence and optimality of the MPTO algorithm and the advantages of this multi-tier hybrid computation offloading system. Also, the optimal tradeoff between E2E delay and energy consumption can be achieved by the MPTO algorithm.

Systematic Trial-Based Instruction: An Evidence-Based Approach to Presenting Remedial Instruction in a Multi-Tier System of Support

Systematic Trial-Based Instruction: An Evidence-Based Approach to Presenting Remedial Instruction in a Multi-Tier System of Support

A Multi-Tier Trust-Based Security Mechanism for Vehicular Ad-Hoc Network Communications

Securing communications in vehicle ad hoc networks is crucial for operations. Messages exchanged in vehicle ad hoc network communications hold critical information such as road safety information, or road accident information and it is essential these packets reach their intended destination without any modification. A significant concern for vehicle ad hoc network communications is that malicious vehicles can intercept or modify messages before reaching their intended destination. This can hamper vehicle ad hoc network operations and create safety concerns. The multi-tier trust management system proposed in this paper addresses the concern of malicious vehicles in the vehicle ad hoc network using three security tiers. The first tier of the proposed system assigns vehicles in the vehicle ad hoc network a trust value based on behaviour such as processing delay, packet loss and prior vehicle behavioural history. This will be done by selecting vehicles as watchdogs to observe the behaviour of neighbouring vehicles and evaluate the trust value. The second tier is to protect the watchdogs, which is done by watchdogs' behaviour history. The third security tier is to protect the integrity of data used for trust value calculation. Results show that the proposed system is successful in identifying malicious vehicles in the VANET. It also improves the packet delivery ratio and end-to-end delay of the vehicle ad hoc network in the presence of malicious vehicles.

Bayesian networks for DNA-based kinship analysis: Functionality and validation of the GENis missing person identification module

GENis is a recently published open-source multi-tier information system developed to run forensic DNA databases. It relies on a Bayesian Networks framework and it is particularly well suited to efficiently perform large-size queries against databases of missing individuals. In this contribution we present a validation of the missing person identification capabilities of GENis. To that end we introduce fbnet, a free-software package written in the R statistical language that implements the complete GENis functionality to perform kinship analysis based on DNA profiles. With the aid of fbnet, we could validate likelihood ratios against estimations draw with Familias and forrel (two well-recognized R packages for kinship quantification) for complex pedigrees provided by the Argentinian reference databank (Banco Nacional de Datos Geneticos, BNDG). We found that our methodological approach presented an excellent performance in terms of accuracy and computation times.

Poor body condition is associated with lower hippocampal plasticity and higher gut methanogen abundance in adult laying hens from two housing systems

It is still unclear which commercial housing system provides the best quality of life for laying hens. In addition, there are large individual differences in stress levels within a system. Hippocampal neurogenesis or plasticity may provide an integrated biomarker of the stressors experienced by an individual. We selected 12 adult hens each with good and poor body condition (based on body size, degree of feather cover and redness of the comb) from a multi-tier free range system containing H&N strain hens, and from an enriched cage system containing Hy-Line hens (n = 48 total). Immature neurons expressing doublecortin (DCX) were quantified in the hippocampus, contents of the caecal microbiome were sequenced, and expression of inflammatory cytokines was measured in the spleen. DCX+ cell densities did not differ between the housing systems. In both systems, poor condition hens had lower DCX+ cell densities, exhibited elevated splenic expression of interleukin-6 (IL6) mRNA, and had a higher relative caecal abundance of methanogenic archea Methanomethylophilaceae. The findings suggest poor body condition is an indicator that individual hens have experienced a comparatively greater degree of cumulative chronic stress, and that a survey of the proportion of hens with poor body conditions might be one way to evaluate the impact of housing systems on hen welfare.

Comparison of Egg Quality Characteristics of Different Quail Lines

This study was carried out to investigate external and internal egg quality traits of different quail lines housed in a multitier cage system. The study was performed on eggs of three different lines of quail as wild type, recessive white and black cross-line stock raised for commercial production. All flocks in the experiment were housed in same environmental conditions for quail and fed same diets during the experiment. A total of 60 eggs from each quail lines were used to determine internal and external egg quality traits. Quail eggs were examined for both internal and external quality characteristics. The eggs from cross-line black coloured quails had significantly greater weight (P<0.01) and it needs more force to crack significantly than the other eggs to break (P<0.012). The black line of quails had significantly greater egg shell thickness than the other line quails (P<0.001). The white line quail eggs had significantly lowest egg length and highest shape index values (P<0.001, P<0.001). The egg yolk of white lines had a significantly lighter yellow than wild and black lines (P<0.003). In conclusion, it seems that the eggs of black coloured lines were relatively superior to wild and white coloured quail groups.

Working without Wages: Network Structure and Migrant Construction Workers’ Protests in China

AbstractMigrant construction workers are among the most vulnerable working populations in China as they are prone to facing the problem of wage arrears under the multi-tier subcontracting system. Based on ethnographic research of migrant construction workers in Tianjin, Shenzhen, Nanchang and Shaoguan, we examine workers’ divergent responses to wage arrears. While extant literature focuses on the positive role of informal networks in facilitating collective action, our findings indicate that the network structure between labour subcontractors and migrant workers plays a key role in enabling or constraining labour protests. We identify two network structures: the satellite network – characterized by arm's-length relationships between subcontractors and clusters of workers; and the spider-web network – characterized by strong relationships between subcontractors and their workers. We found that workers in satellite networks were prone to stage protests over wage arrears, but those in spider-web networks never held collective actions when facing the same problem. We argue that strong guanxi is a double-edged sword for the mobilization of labour protests and that workers’ responses to wage arrears are mediated through the network structure. Future studies may further scrutinize the role of a social network and its operating mechanisms in shaping workers’ working conditions and labour politics.

Assessing measurement equivalence of PSC-17 across teacher and parent respondents

The Pediatric Symptom Checklist-17 (PSC-17) is a popular screening instrument used by parents and clinicians to assess children's behavioral functioning. However, more schools are examining the potential of the PSC-17 as part of a Multi-Tier System of Support framework. To investigate the potential of the PSC-17 in the schools, a sample of 1,779 U.S. preschool and kindergarten-aged children rated by parents (n = 667) and teachers (n = 1,112) was used to assess the measurement invariance of the PSC-17 across respondent groups. Multiple-group Confirmatory Factor Analysis supported partial scalar invariance for the PSC-17, indicating functional equivalence across teacher and parent respondents. Latent mean testing revealed teachers rated children as exhibiting a lower level of Externalizing Problems relative to parents; however, no significant differences in children's Internalizing Problems and Attention Problems were found between teacher and parent ratings.

Autonomy Without Accountability in Resource Allocation Reforms: Blending Old and New Logic in Universities

Purpose: The article explores changes in the institutional autonomy and accountability resulting from university reforms carried out over a period of 28 years under the influence of the traditional public administration and new public management logic. Design/methodology/approach: This qualitative study uses rich empirical material, which includes archival documents as well as 16 semi-structured, in-depth interviews with deans, professors, representatives of the Ministry of Science and Higher Education, and HEI experts. For analysis, we used the general inductive approach. Institutional logic has been used as the theoretical framework to analyze changes in resource allocation, autonomy, and accountability of HEIs. Findings: Following the idea of reform as routine, our study shows that the implemented reforms have proven ineffective in comprehensively increasing the autonomy and accountability of HEIs and that they tend to turn into a routine. However, over the past 30 years, a certain increase in autonomy, combined with accountability shifts from input toward output control mechanisms can be observed. An important finding of this research is also the limited understanding of the concept of accountability by the top management of universities and by the ministry’s representatives. Moreover, this illustrates that accountability is understood only as a formal obligation to report to the funding agency and is treated as an integral part of the Polish HE landscape, increasing from reform to reform. Originality/Value: This article explores the evolution of the Polish state funding systems of universities and analyzes the development from a stable traditional funding model – that was in place before the collapse of the communist system – to a complex multi-tier system and to recent attempts at reforming the HE field, aimed at increasing the autonomy and accountability of Polish universities. More efforts should be made by policymakers to create a sustainable balance between autonomy and accountability in the HE field.

Modernizing Jewish Education in Nineteenth-Century Eastern Europe: The School as the Shrine of the Jewish Enlightenment

Modernizing Jewish Education in Nineteenth-Century Eastern Europe: The School as the Shrine of the Jewish Enlightenment

СОВЕРШЕНСТВОВАНИЕ МЕТОДОЛОГИИ СОВРЕМЕННОГО БУХГАЛТЕРСКОГО УЧЕТА НА ОСНОВЕ ЦИФРОВОЙ ТЕХНОЛОГИИ БЛОКЧЕЙН

This article discusses the impact of the development of the digital economy on accounting methodology through the introduction of digital technologies. The most suitable digital technology for digitalization of accounting is the blockchain system - its brief characteristics are given and the advantages of its use are highlighted. It describes changes in accounting methodology by using a triple record, that is, the occurrence of multi-tier accounting system.

Simulation environment for scalability and performance analysis in hierarchically organized IoT systems

The accelerated development of technologies, especially in the field of telecommunications, ease the integration of embedded devices within various IoT applications. Modern IoT applications assume heterogenous embedded platforms capable of collecting, processing, and exchanging data between the tiers of the IoT system architecture. Designing a multi-tier IoT system, even in the case of architecture that involves a small number of intelligent embedded devices, can be a very demanding process, especially when dealing with the strict requirements of IoT application concerning application performance, scalability, and energy consumption. In this paper, an open-source simulation framework for the performance analysis of an arbitrary multi-tiered IoT system is presented. Framework supports insight into the data availability within the tiers of IoT system enabling designers to evaluate the performance of IoT application and to engineer the system operation and deployment. Besides the performance analysis, proposed framework enables the analysis of energy consumption, architecture scalability utilizing different communication patterns and technologies. The case study of a large-scale IoT application for demonstrating the framework potential regarding the scalability and data availability analysis is also given.

Effect of implementation of multi-tier response system and prolonged on-scene resuscitation for out-of-hospital cardiac arrest.

The purpose of this study was to explain the process and results of implementing a bundle of two cardiopulmonary resuscitation (CPR) programs in Gwang-ju metropolitan city and to determine whether the use of these programs improved the clinical outcomes for out-of-hospital cardiac arrest (OHCA) patients. This was a before- and after-intervention study of the implementation of a bundle of two CPR programs in Gwang-ju. The main intervention was a multi-tier response (MTR) system, with an emphasis on prolonged on-scene resuscitation. The primary outcome was good neurological recovery, and secondary outcomes were survival to discharge and prehospital return of spontaneous circulation (ROSC). A multivariable logistic regression model was used to estimate the association between the study period and outcomes, after adjusting for potential confounders. Interaction analysis was conducted to determine whether the location of arrest and witness status modified the effect of the study period on the study outcomes. The adjusted odds ratios (AORs) for the intervention were 1.35 (0.96-1.90) for pre-hospital ROSC, 1.19 (0.49-2.86) for survival to discharge, and 3.45 (1.01-11.80) for good CPC. The AORs for good neurological recovery of the after-intervention period were 2.93 (0.73-11.77) for a private place, 4.82 (1.04-22.39) for a public place, 5.88 (1.47-23.57) for a witnessed arrest, and 1.49 (0.28-7.86) for a non-witnessed arrest. OHCA patients treated in the after-intervention period with the bundle of CPR programs including MTR and prolonged on-scene resuscitation showed better clinical outcomes, especially pre-hospital ROSC, and neurological recovery at hospital discharge than those treated in the before-intervention period.

Tier 2 Social and Emotional Learning Interventions of a Multi-Tier System of Support: Literature Review

There are many students who face barriers and difficulties to display social emotional learning competencies. As result of lacking these skills, students become less connected to school as they proceed from elementary to middle to high school and negatively impact their academic performance, behavior, and health. Research shows that small group instruction is highly effective in helping students master essential skills and tasks. The purpose of this paper is to review social and emotional learning interventions at Tier 2 of a Multi-Tier System of Support (MTSS). The secondary intervention tier utilizes targeted interventions in small groups identified by support team and then employ them by using effective strategies that directly target a skill deficit. This paper includes a review of evidence-based practices for improving social-emotional outcomes and interventions for behavioral problems. Keywords : social-emotional learning, multi-tier system of support, tier 2, and evidence-based practice. DOI: 10.7176/JEP/12-36-02 Publication date: December 31 st 2021

Unravelling 30 ka recharge history of an intensely exploited multi-tier aquifer system in North West India through isotopic tracers – Implications on deep groundwater sustainability

Northwest part of India is an agriculturally active region experiencing rapid rise in food production and steep decline in groundwater levels. The freshwater requirement is mostly met by regional aquifers which are inherently heterogeneous and undergoing extensive human inducted perturbations. These factors pose great challenge in planning sustainable groundwater management. In this study, environmental isotopes (2H, 18O, 13C, 3H and 14C) were applied to understand the regional recharge mechanism during the last 30 ka and hydrogeological controls impacting the aquifer dynamics and inter-aquifer connectivity of the Ghaggar River basin. Rayleigh distillation modeling indicates that major groundwater recharge is through monsoonal rains while rainfall during other seasons is lost either through evaporation or surface runoff. The evaporation loss is estimated to be 1.5 to 10% and more pronounced in the southern part of the study area. Regional recharge from Siwalik foothills contributes to groundwater up to a depth of 250 m below ground level (bgl). The lumped parameter modeling (LPM) using 3H data estimated groundwater ages 34.7 ± 12.1 and 95.8 ± 11.3 years for shallow and deep aquifers respectively. Radiocarbon dating indicates presence of paleogroundwater (0.4 to 28.6 ka before present, BP) in the deeper aquifer of central part of the study area. Interpretation of the paleowater and paleoprecipitation isotope data in conjunction with available paleogeomorphologic information suggests two different recharge phases. Phase I extending from ~28.6 to 10.1 ka, showed ~48–61% contribution from isotopically depleted perennial river system. Phase II spanning from ~12.5 to 0.4 ka BP showed insignificant contribution from river recharge, which can be attributed to the decreased strength of the perennial river flows. The research methodology proposed in this study will be beneficial in improving the understanding of groundwater storage and its variability with changes in regional climatic conditions.

P.217 Patient reported outcomes following surgery for lumbar spinal stenosis: Comparison of a universal and multitier health care system

Background: Canada has a universal health care system while the United States utilizes a combined public and private payer system. The purpose of this study is to investigate whether there are differences in clinical outcomes between those surgically treated for spinal stenosis in Canada as compared to the United States. Methods: Surgical lumbar spinal stenosis patients treated in Canada that were enrolled in the Canadian Spine Outcome Research Network (CSORN) prospective multicenter registry were compared with the surgical cohort enrolled in the Spine Patients Outcome Research Trial (SPORT) study. Spine-related patient reported outcomes (PROs) were compared at 3 months and 1 year post-operatively. Results: The CSORN cohort consisted of 432 patients and the SPORT cohort was made up of 278 patients. The CSORN cohort had a higher proportion of patients with a symptom duration greater than 6 months (92.3% vs. 58.3%, p<0.0001). The CSORN cohort demonstrated significantly greater rates of satisfaction after surgery at 3 months (p=0.003) and 1 year (p<0.001). Conclusions: Patients undergoing surgical treatment for lumbar spinal stenosis in Canada (CSORN cohort) reported higher rates of satisfaction at 3 months and 1 year post-operatively compared to the United States cohort (SPORT) despite having longer durations of symptoms prior to surgery.

Heterogeneous 3-D Integration of Multitier Compute-in-Memory Accelerators: An Electrical-Thermal Co-Design

Emerging nonvolatile memory (eNVM)-based compute-in-memory (CIM) accelerators have been proven in silicon for machine learning at the macrolevel. To fully unleash the system-level benefits, the heterogeneous 3-D integration (H3D) using through-silicon via (TSV) is a promising approach, to: 1) address the challenges of area-hungry peripheries in CIM accelerators; 2) solve the 2-D scaling challenges of eNVM; and 3) stack enormous amount of embedded memories that are required in state-of-the-art deep neural network models. This article presents an electrical-thermal co-design of multitier CIM accelerators, based on SRAM and/or eNVM, with hybrid technology nodes for logic and memory tiers. We benchmark the CIM accelerators on 8-bit ResNet-34 for ImageNet recognition, with layer-by-layer and pipelined schemes, respectively. By sweeping TSV diameter from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$30~\mu \text{m}$ </tex-math></inline-formula> to 100 nm, we investigate the tradeoffs of system performance metrics (TOPS/W, TOPS, and TOPS/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) and H3D challenges (thermal and IR-drop in power delivery). Finally, we find the sweet spot of TSV diameter for multitier H3D system is 1– <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3~\mu \text{m}$ </tex-math></inline-formula> , to guarantee balanced area-overhead, performance, and IR-drop in power delivery. The extended benchmark framework is released on GitHub ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><uri>https://github.com/neurosim</uri></i> ) as an open-source tool for the research community.

Patient-Reported Outcomes Following Surgery for Lumbar Disc Herniation: Comparison of a Universal and Multitier Health Care System.

Ambispective cohort study. Canada has a government-funded universal health care system. The United States utilizes a multitier public and private system. The objective is to investigate differences in clinical outcomes between those surgically treated for lumbar disc herniation in a universal health care and multitier health system. Surgical lumbar disc herniation patients enrolled in the Canadian Spine Outcome Research Network (CSORN) were compared with the surgical cohort enrolled in the Spine Patients Outcome Research Trial (SPORT) study. Baseline demographics and spine-related patient-reported outcomes (PROs) were compared at 3 months and 1 year post-operatively. The CSORN cohort consisted of 443 patients; the SPORT cohort had 763 patients. Patients in the CSORN cohort were older (46.4 ± 13.5 vs 41.0 ± 10.8, P < .001) and were more likely to be employed (69.5% vs 60.3%, P = .003). The CSORN cohort demonstrated significantly greater rates of satisfaction after surgery at 3months (87.2% vs 64.8%, P < .0001) and 1year (85.6% vs 69.6%, P < .0001). Improvements in back and leg pain followed similar trajectories in the two cohorts, but there was less improvement on ODI in the CSORN cohort (P < .01). On multivariable logistic regression, the CSORN cohort was a significant independent predictor of patient satisfaction at 1-year follow-up (P < .001). Despite less improvement on ODI, patients enrolled in CSORN, as part of a universal health care system, reported higher rates of satisfaction at 3months and 1year post-operatively compared to patients enrolled within a multitier health system.

Effects of stocking density on the performance, tibia mineralization, and the expression of hypothalamic appetite genes in broiler chickens

Abstract The current study investigated the effects of stocking density (SD) on the performance, tibia mineralization, and the hypothalamic appetite genes expression in broilers. A total of 2,800 1-d-old male broilers (Cobb 500) were distributed in a completely randomized design to 1 of 5 SD treatments with 8 replicate cages for each treatment. The SD treatments were 12.5, 15.0, 17.5, 20.0, and 22.5 birds/m2, corresponding to 50, 60, 70, 80, and 90 birds per cage (4 m2/cage), respectively. The concentration of tibia phosphorus was determined by the ammonium metavanadate colorimetric method and the mRNA abundance in different tissues was measured by the real-time quantitative PCR method. The data were analyzed by the one-way and/or two-way analysis of variance and polynomial contrasts were used to determine the effect of increasing SD. Feed intake linearly decreased (P &lt; 0.05) with increasing SD during d 1-42 production period. On d 42, body weight and tibia breaking strength were significantly lower in the groups of 17.5, 20.0 and 22.5 birds/m2 than in the groups of 12.5 and 15 birds/m2 (P &lt; 0.01). Concentrations of ash and phosphorus in the tibia of broilers linearly decreased (P &lt; 0.03) with increasing SD on d 42. The SD of 22.5 birds/m2 decreased the mRNA abundance of neuropeptide Y (NPY), NPY-receptor (NPYR) 1, and NPYR2 (P &lt; 0.05), while it increased melanocortin receptor 4 mRNA abundance (P = 0.012) in the hypothalamus of broilers as compared with the SD of 12.5 birds/m2 on d 21 and 42. The mRNA abundance of hypothalamic cocaine and amphetamine-regulated transcript (CART), corticotrophin-releasing factor (CRF), and CRF-receptor 1 (CRFR1) were higher (P &lt; 0.05) in the group of 22.5 birds/m2 than in the group of 12.5 birds/m2 on d 21. We concluded that increasing stocking density beyond 15 birds/m2 (corresponding to the 45 kg/m2 at 42 days of age) suppressed final BW and bone mineralization of broilers raised in multitier cage system. Hypothalamic NPY and CRF signaling might be involved in the anorexigenic effect of HSD.

Procurement sharing decision for sustainable and regular products in a multi-tier production system

Many sustainable products require innovative design techniques but the same materials as regular products. In practice, whether pooling the material procurement orders via procurement sharing can be a strategic decision when an OEM produces both sustainable and regular products. In this paper, we formulate a multi-tier production system comprising of an OEM, a CM, and two material suppliers, and study two typical strategies: (1) procurement sharing, where the procurement functions of the sustainable and regular products are outsourced to the CM, and (2) independent procurement, where the OEM independently procures materials for the sustainable product. We solve the four-stage-four-player optimisation problem and find that the change of the market potential of the sustainable product heavily determines the OEM’s overall procurement cost, and consequently the procurement sharing decisions. Under independent procurement, the wholesale prices of the sustainable and regular products show opposite characteristics when the market potential of the sustainable product varies, because the two suppliers have opposite pricing incentives. We derive three interactive effects that alter the OEM’s procurement sharing incentives, which makes the OEM prefer independent procurement only when the market potential of the sustainable product is in a moderate range.