Digital System Research Articles

Optimization of Decision Making when Controlling in a Digitalized System Based on a Multi-Stage Block Programming Procedure

The article discusses the process of formulating optimization models and a multi-stage decision-making procedure when managing the disaggregation of resources and volumes of activity in a digitalized system with a multi-layer structure. A general formulation of the control optimization problem is given within the framework of the theory of potential efficiency of complex systems. The possibility of transforming the optimal condition for the disaggregation of resources and activity volumes into related block linear programming problems is shown. Optimization models are formulated in which the extreme and boundary require­ments of the general formulation of the optimization problem are divided into blocks. In the problem of resource disaggregation, the first block optimization model is based on the requirements of the control environment, supplemented by transfer environments — resource and digital, the second on the requirements of the effective functioning of the activity environment. When disaggregating activity volumes, block optimization models are built in the reverse order. An algorithmic scheme for a multi-stage optimization procedure is proposed that ensures coordination of solutions at two levels: between the blocks of each disaggregation problem, and between tasks. The algorithms of the Dantzig-Wolff and Kornai-Litak methods have been modified by adapting to the peculiarities of decision-making problems when managing a digitalized system with a multilayer structure.

A Digital Approach for Addressing Suicidal Ideation and Behaviors in Youth Mental Health Services: Observational Study.

Long wait times for mental health treatments may cause delays in early detection and management of suicidal ideation and behaviors, which are crucial for effective mental health care and suicide prevention. The use of digital technology is a potential solution for prompt identification of youth with high suicidality. The primary aim of this study was to evaluate the use of a digital suicidality notification system designed to detect and respond to suicidal needs in youth mental health services. Second, the study aimed to characterize young people at different levels of suicidal ideation and behaviors. Young people aged between 16 and 25 years completed multidimensional assessments using a digital platform, collecting demographic, clinical, social, functional, and suicidality information. When the suicidality score exceeded a predetermined threshold, established based on clinical expertise and service policies, a rule-based algorithm configured within the platform immediately generated an alert for treating clinicians. Subsequent clinical actions and response times were analyzed. A total of 2021 individuals participated, of whom 266 (11%) triggered one or more high suicidal ideation and behaviors notification. Of the 292 notifications generated, 76% (222/292) were resolved, with a median response time of 1.9 (range 0-50.8) days. Clinical actions initiated to address suicidality included creating safety plans (60%, 134/222), conducting safety checks (18%, 39/222), psychological therapy (8%, 17/222), transfer to another service (3%, 8/222), and scheduling of new appointments (2%, 4/222). Young people with high levels of suicidality were more likely to present with more severe and comorbid symptoms, including low engagement in work or education, heterogenous psychopathology, substance misuse, and recurrent illness. The digital suicidality notification system facilitated prompt clinical actions by alerting clinicians to high levels of suicidal ideation and behaviors detected among youth. Further, the multidimensional assessment revealed complex and comorbid symptoms exhibited in youth with high suicidality. By expediting and personalizing care for those displaying elevated suicidality, the digital notification system can play a pivotal role in preventing rapid symptom progression and its detrimental impacts on young people's mental health.

RESEARCH ON DIGITAL LITERACY ENHANCEMENT OF PHYSICAL EDUCATION TEACHERS

In the context of digital transformation, enhancing physical education teachers' digital literacy has become a crucial task in educational development. This study employs methods including literature analysis and case studies to systematically explore the theoretical foundation, practical challenges, and development strategies for improving physical education teachers' digital literacy. The research finds that physical education teachers' digital literacy is a multi-dimensional conceptual system, encompassing digital technology knowledge and skills, teaching design and assessment capabilities, the ability to integrate educational theory with physical education knowledge, and learning and self-development capabilities. The study reveals that current efforts to enhance physical education teachers' digital literacy face challenges such as uneven resource allocation, incomplete training systems, and lack of assessment mechanisms. To address these issues, this research proposes systematic solutions including constructing digital curriculum training systems, integrating and developing educational resources, optimizing digital teaching environments and assessment systems, and strengthening faculty development. The research findings have significant theoretical and practical value for promoting the informatization of physical education and enhancing physical education teachers' digital literacy levels. KEYWORDS: physical education teachers; digital literacy; teacher training; digital teaching; education modernization

Addressing Language and Ableism in Information Technology: A Call to Action for Academic Librarians

This column explores the pervasive influence of information technologies in academic libraries and underscores the critical role of librarians and professional staff in navigating and thriving within this technology-rich environment. As libraries increasingly integrate advanced technologies such as AI, digital asset management systems, and online communication platforms, addressing ableism and ensuring accessibility becomes paramount. The paper highlights key areas where ableism can manifest, including Zoom meetings, information technology, digital asset management systems, community of practice documents, instructional design, collection development, library programming and events, reference and research services, scholarly communications, information literacy, and artificial intelligence. For each area, practical strategies are provided to decrease ableism and promote inclusivity. By fostering an environment that prioritizes accessibility and inclusivity, librarians can better connect users to information resources and ensure that all individuals, regardless of ability, can fully engage with and benefit from library services. This column aims to equip librarians with actionable insights and tools to create more equitable and just academic libraries.

Layanan Administrasi Kesiswaan di SMP Negeri 55 Palembang

This study aims to analyze student administration services at SMP Negeri 55 Palembang, covering service processes, as well as supporting and inhibiting factors. The research employs a descriptive qualitative method with interviews, observations, and documentation. Informants include key and supporting participants, totaling 20 individuals. Key informants consist of the head of administration, administrative staff, and students. Supporting informants include vice principals, teachers, and parents. The data analysis techniques used include data reduction, data presentation, data verification, and conclusion drawing. Data validity was tested using source triangulation, technique triangulation, and time triangulation. The findings indicate that student administration services have been running effectively, supported by a digital system that minimizes errors in the administrative process. Administrative staff exhibit reliability, active responsiveness, and a high level of empathy in assisting students, parents, and teachers requiring help

DELIVERY TRACKING SYSTEM WITH ON-DEMAND LOCATION UPDATE DI PT ANUGRAH HADI ELECTRIC MENGGUNAKAN METODE AGILE

PT Anugrah Hadi Electric, an electrical general supplier in Tangerang, faces challenges in the process of delivering goods to customers in the Jabodetabek area. The company still relies on conventional delivery methods where the owner directly delivers the goods, which causes constraints in time efficiency and communication with customers. This research aims to develop a delivery tracking system with on-demand location update feature to improve operational efficiency and customer satisfaction. Using Agile methodology, the system is developed by integrating Firebase technology for real-time location tracking, Kotlin for mobile application development, Laravel as the backend framework, and MySQL as the database. The system allows customers to monitor delivery status directly through the application, reducing the need for manual communication with the owner. The implementation results show significant improvements in delivery efficiency and customer satisfaction. The system successfully reduces the communication burden on the owner and provides better transparency to customers regarding the status of their shipments. For further development, the addition of automatic notification features, improved data security, and integration with digital payment systems are recommended. Periodic evaluation of the application's performance is also needed to ensure the system continues to meet the needs of the company and customers along with technological developments.

Facilitators and inhibitors of attitude and word-of-mouth intention toward adoption of digital municipal service systems: A stimulus-organism-response approach.

Increased technology adoption has significantly transformed how governments interact with citizens. Today, e-government services and tools are integral to modern public administration. Factors affecting users' adoption of e-government services have been studied in the past. However, this study focuses on citizens' acceptance and resistance to such services, which have not been thoroughly explored. This study addresses the gap by examining the facilitators and inhibitors affecting users' perceptions of the Digital Municipal Service System (DMSS). An integrated research model was developed based on the Stimulus-Organism-Response (SOR) framework. Using Smart-PLS, the study validated 353 respondents' data collected from Bangladesh. The study revealed that platform quality, convenience, social, and inclusiveness values significantly influenced attitudes toward DMSS adoption. On the other hand, tradition and usage barriers significantly negatively impacted attitudes toward DMSS adoption. These findings offer important insights for policymakers involved in developing and implementing e-government services in emerging economies such as Bangladesh. The study also provides a foundation for further research on technology adoption.

Asymptomatic multifocal avascular necrosis, a commonly overlooked finding in patients with systemic lupus erythematosus

BackgroundIn patients with Systemic lupus erythematosus (SLE), osteonecrosis of various joints is a debilitating complication associated with the disease and its treatment, in which a considerable proportion of osteonecrosis may be asymptomatic. Recognizing the crucial role of early and timely detection, as well as appropriate management of asymptomatic osteonecrosis, in preventing joint destruction, we conducted a study to evaluate the prevalence of asymptomatic osteonecrosis in SLE patients who have already been diagnosed with symptomatic osteonecrosis. Additionally, we aimed to examine the relationship between proposed risk factors of osteonecrosis and the development of asymptomatic osteonecrosis.MethodsIn this cross-sectional study, Patients with recently diagnosed symptomatic osteonecrosis of at least one joint were selected by reviewing data from the digital medical record system of the Rheumatology Research Center. The patients underwent three-phase Single Photon Emission Computed Tomography (SPECT) bone scintigraphy to screen for other asymptomatic osteonecrotic joints. MRI was subsequently performed on the asymptomatic osteonecrotic sites for further diagnostic confirmation. The study evaluated the prevalence of asymptomatic osteonecrosis, the extent of joint involvement, the specific locations of osteonecrosis, the most commonly affected joints, and the risk factors for asymptomatic osteonecrosis.ResultsEight out of the 17 patients (47%) who participated in our research were found to have asymptomatic osteonecrosis. The most commonly affected joint without symptoms was the left knee (25%), while the most frequently affected joint with symptoms was the left hip (23.07%). The only statistically significant difference observed between patients with and without asymptomatic osteonecrosis in this study was the age at which the disease first appeared (p = 0.046) and this age was higher among patients with asymptomatic osteonecrosis.ConclusionsOur research provides further evidence of the high incidence of asymptomatic osteonecrosis in individuals with SLE due to the nature of the disease and the frequent use of high-dose corticosteroids. It underscores the importance of early detection through whole-body SPECT bone scintigraphy and MRI, as well as prompt intervention in order to avert the incapacitating effects of osteonecrosis.

One complete system? Telegraphy, cybernetics and industrial archaeology

Telegraph systems laid the groundwork for the first global digital systems. In Australia, 50 years before Federation, the continental-scale telegraph system linked to the wider world using submarine connectors. Little previous work has been done to reveal the materiality of the complex technological and human systems necessary to support continental scale telegraph systems. Here we explore Australian telegraphy, focusing on the Overland Telegraph Line (OTL) and through three distinct lenses: historical evidence, cybernetics and industrial archaeology. We use the Strangways Springs telegraph site as a case study. While archaeology has previously dealt with telegraph sites, it has largely treated them as isolated parts of a larger ‘story’ rather than interdependent components of a technological system. We see cybernetics as a means to understand the OTL as a connected system through which information flows, mediated by the technical and human elements at the various nodes and parts of the system. A cybernetically-informed industrial archaeology reveals how the study of systems requires a wide range of forms of evidence: from the physical heritage through to various archives related to technology, regulations and individuals. A cybernetic approach as advocated here shifts our thinking from connection to that of interdependency, as every element of the system (technical, social, and ecological) needs to function for the whole to operate.

A Framework for Current and New Data Quality Dimensions: An Overview

This paper presents a comprehensive exploration of data quality terminology, revealing a significant lack of standardisation in the field. The goal of this work was to conduct a comparative analysis of data quality terminology across different domains and structure it into a hierarchical data model. We propose a novel approach for aggregating disparate data quality terms used to describe the multiple facets of data quality under common umbrella terms with a focus on the ISO 25012 standard. We introduce four additional data quality dimensions: governance, usefulness, quantity, and semantics. These dimensions enhance specificity, complementing the framework established by the ISO 25012 standard, as well as contribute to a broad understanding of data quality aspects. The ISO 25012 standard, a general standard for managing the data quality in information systems, offers a foundation for the development of our proposed Data Quality Data Model. This is due to the prevalent nature of digital systems across a multitude of domains. In contrast, frameworks such as ALCOA+, which were originally developed for specific regulated industries, can be applied more broadly but may not always be generalisable. Ultimately, the model we propose aggregates and classifies data quality terminology, facilitating seamless communication of the data quality between different domains when collaboration is required to tackle cross-domain projects or challenges. By establishing this hierarchical model, we aim to improve understanding and implementation of data quality practices, thereby addressing critical issues in various domains.

Risk Assessment for Cyber Resilience of Critical Infrastructures: Methods, Governance, and Standards

As future infrastructures increasingly rely on digital systems, their exposure to cyber threats has grown significantly. The complex and hyper-connected nature of these systems presents challenges for enhancing cyber resilience against adverse conditions, stresses, attacks, or compromises on cybersecurity resources. Integrating risk assessment with cyber resilience allows for adaptive approaches that can effectively safeguard critical infrastructures (CIs) against evolving cyber risks. However, the wide range of methods, frameworks, and standards—some overlapping and others inadequately addressed in the literature—complicates the selection of an appropriate approach to cyber risk assessment for cyber resilience. To investigate this integration, this study conducts a systematic literature review (SLR) of relevant methodologies, standards, and regulations. After conducting the initial screening of 173 publications on risk assessment and cyber resilience, 40 papers were included for thorough review. The findings highlight risk assessment methods, standards, and guidelines used for cyber resilience and provide an overview of relevant regulations that strengthen cyber resilience through risk assessment practices. The results of this paper will offer cybersecurity researchers and decision-makers an illuminated understanding of how risk assessment enhances cyber resilience by extracting risk assessment best practices in the literature supported by relevant standards and regulations.

The Heads Up Checkup Digital Mental Health & Behavioral Risk Screening System: Clinical Inter‐Rater Reliability for Identifying Youth in Crisis

ABSTRACTThe present study evaluated the inter‐rater reliability of the Heads Up Checkup (HCU), a brief digital mental health and behavioral adaptive screening system designed for use in primary care and diverse school settings. Two independent licensed clinical psychologists reviewed a random sample of 30 (N = 30) HCU clinical screening reports of 13−14 year old adolescents drawn from a larger sample (N = 846) enrolled in a public middle school in California. Results showed strong inter‐rater agreement (Fleiss kappa = 0.93) between clinician ratings and the screener's priority risk index (HPI) in identifying students “in crisis.” In addition, clinicians' ratings of confidence in their priority judgments were found to be significantly higher for the “in crisis” cases. Reasonable evidence of convergent validity emerged due to a strong relationship between clinician ratings of psychological distress and the HPI. Overall findings suggest that as an online universal school‐based screener, the HCU has valid utility for identifying young adolescents “in crisis” which can translate into timely interventions and pragmatic real‐world therapeutic solutions. Future research directions with respect to the refinement of the HCU's measurement characteristics and its feasibility as an online screener at the population‐level in schools are discussed.

High stability static/dynamic gain in phototransistors for high speed digital optical fiber telecommunication systems based on various modulation code schemes

High stability static/dynamic gain in phototransistors for high speed digital optical fiber telecommunication systems based on various modulation code schemes

Digital breast tomosynthesis system concept addressing the needs in breast cancer screening and diagnosis

Digital breast tomosynthesis system concept addressing the needs in breast cancer screening and diagnosis

Low-Cost Hardware Analog and Digital Real-Time Circuit Simulators for Developing Power Electronics Control Circuits

The paper describes low-cost hardware-based analog and digital real-time circuit simulators for the development of power electronics control circuits. During the process of designing and developing digital control circuits for power electronics systems, preliminary verification of control algorithms is required. For this purpose, software simulators such as Pspice, Psim, Matlab-Simulink, and many others are commonly used. Afterward, the developed control algorithm is implemented in the digital control system. For further verification of the implemented control algorithms, a hardware-based analog or digital simulator can be utilized. The paper presents the author’s proposed analog simulators. In the digital version of the simulator, TMS320F28388D microcontroller with 200 MHz clock was used. These simulators have demonstrated their usefulness in the development of power electronics systems.

Concept and theoretical performance analysis for decentralised digital synchronisation in distributed radar sensor networks

AbstractThis paper presents a decentralised technique for achieving frequency, time, and phase synchronisation of platforms cooperating in a distributed radar sensor network. The proposed method is advantageous for existing digital radar systems as it can be implemented entirely in the software without the use of additional RF hardware required by other techniques. The synchronisation signal model for signals transmitted and received in various clock domains is presented and an estimation model is subsequently derived for estimating and correcting the clock drifts. A modified version of a previously developed phase and clock bias correction procedure is outlined for correcting time and phase after frequency synchronisation. A comprehensive theoretical performance analysis of the technique is performed in which the expected maximum achievable performance is derived in terms of the Cramér–Rao lower bound for frequency, time, and phase measurements. Multiple Monte Carlo simulations show that the proposed technique approaches this performance limit. Finally, a simulated distributed transmit beamforming scenario is provided to show the application of the proposed technique in a practical system architecture. The results of this show that as the signal‐to‐noise ratio approaches moderate levels, the proposed synchronisation technique enables the beamforming network to achieve nearly optimal coherent energy gain at the beamforming destination.

Capitalizing Trademarks as Security: The Canadian Trademark Finance Perspective

Canada’s world-renowned banking sector is well- regulated, capitalized and one of the world’s most stable. It meets the essential pre-conditions for intellectual property (IP) finance methods such as a strong IP regime and a pool of firms with registered trademarks. In 2018 Canada launched its National IP Policy followed by certain IP finance initiatives led by the Canadian Business Development Bank (BDC) in 2019. However, it is not well understood how the Canadian Constitution structures economic relations. Certain longstanding federal and provincial issues remain to be addressed if trademark-backed finance is to become part of mainstream commercial lending in Canada. This article contributes to the nascent academic interdisciplinary trademark law and finance literature. An in-depth literature review highlights the existing gaps between the Canadian federal and provincial legal frameworks that govern security interests in trademarks, and market needs. The traditional legal research methodology evaluates the impact of relevant case law, public policies and law practice, adopting finance, economic and IP rights theory perspectives. A digital shared ledger system technology law solution is proposed to enhance registration of security interests with the aim of making trademark finance in Canada more effective and efficient. This article is foundational in the sense that it paves the way for recommendations for new policies with a view to normalising trademark-backed debt finance processes in Canada.

Digital trade in Latin America: features of regulation and prospects

The article analyzes the peculiarities of digital trade development and regulation in countries of Latin America and the Caribbean. It indicates regional initiatives for digital trade governance and main difficulties hindering the growth of cross-border etrade and integration of the region into the international digital trade system. The article also examines the participation of Latin American countries in negotiations on aspects of e-commerce regulation within the WTO framework and derives some recommendations on the formation of a regulatory space in the region.

Method of determining the coordinates of a low altitude object under the conditions of using several radio signals.

Currently, in large cities, there is a steady tendency to increase the spatial density of telecommunication systems. The saturation of the radio spectrum with analog and digital systems used to solve the problems of radio communication and television allows to improve the technologies of semi-active radar detection and determination of the coordinates of a low-altitude object on their basis. Conducting radar surveillance using non-radar radar transmitters is often called semi-active radar using extraneous or parasitic radiation sources. The advantages of such systems are the minimization of deployment costs, low operating energy costs, low probability of malfunctioning, stealth of the fact of operation, environmental friendliness, and the absence of requirements for the allocation of radio frequency resources. Relatively high heights of antennas of communications and television transmitters with the existing radiated power create favorable conditions for detecting low-altitude objects. Digital signals of modern telecommunication systems have a spectrum width that provides acceptable resolution and accuracy of measuring the total distance and angular coordinates [20; 21]. In the general case, systems of this type are a multi-position system consisting of one or more radiation sources and one or more receiving positions spread in space [22; 23]. The paper gives a general description of the proposed method of determining the coordinates of an aerial object at low altitude under the conditions of propagation of several beams of radio signals. The method and its technical solution capable of determining the coordinates of an unauthorized low-altitude object under the conditions of the existence of several rays of radio signal propagation are defined, and the algorithm of its operation necessary for the technical implementation of the proposed method is presented. The paper considers options for determining the coordinates of aerial objects with different composition of primary coordinate measurements and the number of receiving points. The accuracy of determining the location of the object for multi-position radio systems of this type was evaluated under the conditions of the existence of several beams of radio signal propagation in the developed model, taking into account the number of received signals and their measurement errors.

Simple, accurate, and precise detection of total nitrogen in surface waters using a smartphone-based analytical method.

In this study, a simple, accurate, and precise analytical strategy was developed for the determination of total nitrogen (total dissolved nitrogen + particulate nitrogen) in surface waters using smartphone technology. The spectrophotometric method based on digestion with persulfate, commonly used in water analyses, was integrated with a digital image-based colorimetric detection system (DIC). To evaluate the accuracy of the total nitrogen-digital image-based colorimetric detection system (TN-DIC), results obtained from the Hach method and UV-VIS spectrophotometer were compared with the RGB values obtained from the smartphone imaging system. T-Test results indicated no statistically significant difference between the results obtained from the TN-DIC method and the standard methods. The linear range of the TN-DIC method was determined to be 0.25-5mg/L. The analytical quality indicators of the system were established as follows: limit of detection (LOD) 0.095ppm, limit of quantification (LOQ) 0.29ppm, %RSD 0.32, and R2 value 0.9982. Recovery percentages (99-112%) used to measure the analytical performance of the method were calculated through spike applications at concentrations of 1 and 2ppm in real water samples. Unlike traditional spectrophotometric methods, this smartphone-based approach is fast, simple, and cost-effective, requiring no complex equipment during analysis.