Leading & Enlightening Journal UMY
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Stability Optimization of Variable Frequency Drives Using Sliding Mode Control with Linear Matrix Inequalities for Multi-Agent Systems
Full text linkVariable Frequency Drives (VFDs) serve as essential elements for modern industrial operations which focus on enhancing energy efficiency and decreasing operational expenses. These systems encounter major stability issues when they operate under adverse conditions which include sudden load changes and power disturbances and delays in signal processing and mechanical system responses. Sliding mode control (SMC) has proven to be an effective solution because it provides adaptable monitoring techniques which also maintain system stability. The research study delivers its main contribution through the implementation of linear matrix inequality (LMI) method within the SMC framework to enhance stability in multi-agent VFD systems. The proposed technique operates to direct the switching functions of the DC link DC-DC CUK converter in the subject system. The subject system exists in mathematical form which allows researchers to study its behavior when exposed to standard input testing signals and its stability characteristics. The system maintains its stability during quick load variations which proves that the control method produces better results for systems that manage speed and torque in motor groups. The system stability during fast load variations proves that the control method produces better results for motor group speed and torque control systems which makes the technology suitable for transportation systems and renewable energy systems and other applications. Standard VFDs present challenges because they require specific motor types and operate with various communication protocols and expensive components. The authors indicate that it should be investigated to gauge the feasibility of having more advanced control algorithms incorporated with the suggested control system; enhancing its adaptability and performance control
An Optimal Tracking Control Algorithm for a Gun Platform with a Moving Target
No full textThe tracking control problem for a gun platform plays an important role in military tasks. However, in obstacle-rich space, the system faces the energy minimization by adjusting the control signals in case of tracking a moving target. This paper presents a solution for applying optimal control to adapt to changes in model parameters describing the electromechanical system of the artillery platform in the process of tracking mobile targets in the air. Moreover, the unification of tracking performance and optimal control is necessary to be guaranteed to improve control performance in the gun platform system. To address the challenge of constructing the tracking error model, the Linear Tracking Quadratic (LQT) is employed to develop the optimal control scheme. According to the corresponding approximation, a novel optimal tracking algorithm is presented for a Gun Platform with the tracking objective of following a moving target. Extensive simulation results of the cost function with comparisons demonstrate the robustness and efficiency of the proposed method
Does The Legacy of Colonialism Define Islamism? Analyzing Hallaq’s Critique of Islamic Political Modernity
No full textThis paper critically examines Wael Hallaq’s argument that contemporary Islamist movements are structurally shaped by colonial modernity and that the modern Islamic state is a hybrid formation rooted in Western political epistemologies rather than an extension of classical Islamic governance. While compelling, these framing risks underemphasize the heterogeneity, agency, and adaptive capacities of Muslim reformist actors. Using Fairclough’s Critical Discourse Analysis and a decolonial framework, the study interrogates the ideological and epistemic assumptions underlying Hallaq’s “impossibility thesis.” The textual analysis shows that his lexical, modal, and metaphorical choices construct a narrative of structural closure that minimizes reformist creativity, while the discursive-practice analysis reveals how his arguments circulate within Western academic paradigms that can unintentionally reinforce epistemic hierarchies. The socio-ideological analysis demonstrates that, although Hallaq exposes the colonial genealogy of the modern state, his emphasis on rupture sometimes obscures how Islamist movements creatively reinterpret shūrā (consultation), maṣlaḥah (public interest), and khilāfah (caliphate), within contemporary political contexts. The findings argue for a more nuanced account of Islamic political agency and situate Islamism within broader debates on decolonial praxis, epistemic plurality, and emerging frameworks such as Islamic multiple modernities, ethical-political subjectivity, and multi-scalar engagements with state power
Integrating Digital Media into Culturally Rooted Environmental Events to Promote Sustainable Lifestyle
No full textDeforestation remains one of Indonesia’s most pressing environmental challenges, driven primarily by plantation expansion, illegal logging, mining, and forest fires. Public awareness of deforestation risks is essential to support preventive efforts. Sedekah Hutan is a social campaign that combines environmental advocacy with cultural rituals, encouraging wider community participation. Although digital media offers significant potential to strengthen conservation education, its use in culturally rooted environmental campaigns often remains limited to event promotion. This study explores the current role of digital media in such campaigns and examines its potential for more transformative awareness-building. Utilizing participatory and dialogical communication and media ecology theories, this qualitative research draws on participatory observation, interviews, and document analysis. Despite the limited use of digital media, it was important in communicating messages of cultural identity and care for the environment, especially for younger audiences. The event text drew on cultural conditions for its success, but carry-over awareness was reliant on working with stakeholder, and being more strategic in our engagement via digital media. Academically, this study contributes to environmental communication scholarship by connecting digital strategies with local wisdom. Practically, it offers insights for educators and campaigners to utilize social media beyond promotion—as a meaningful tool for long-term environmental advocacy.
Online Blind Buying of Local Perfume: Reducing Uncertainty through Digital Cues
No full textLocal perfumes have increasingly entered Indonesia’s e-commerce market, yet competition remains dominated by long-established local and global brands available in physical stores. New brands that rely mainly on online distribution face a significant challenge because perfumes are sensorial products that cannot be directly experienced prior to purchase, resulting in high product uncertainty. Drawing on Uncertainty Reduction Theory, this research investigates how marketplace and social media as digital platforms through product descriptions, online reviews, and interactions with the seller shape consumers’ intention to blind buy local perfumes online, while also examining the mediating role of perceived product uncertainty. A quantitative explanatory design was employed, using an online survey of 306 consumers with prior blind buying experience of local perfumes through PLS-SEM. The findings reveal that product descriptions and perceived product uncertainty significantly drive blind buying intention, whereas online reviews and interactions with the seller do not exert a direct effect. All three information cues significantly influence perceived product uncertainty, and mediation analysis indicates that seller interactions indirectly enhance blind buying intention via reduced perceived product uncertainty. These results extend the application of Uncertainty Reduction Theory by highlighting the mediating role of perceived product uncertainty in the context of online perfume purchases.
Japan’s Digital Disaster Diplomacy: Evaluating the Safety Tips Application in Protecting Indonesian Citizens
No full textThis research examined the application of Safety Tips for Disaster as a digital diplomacy tool employed by Japan to ensure the safety of Indonesian citizens (WNI) during natural disasters. This research utilized qualitative studies to analyze official documents related to the Safety Tips application, including publications from the Japan Tourism Agency (JNTO), journal articles, relevant disaster response policies, and interviews with relevant representatives. Findings highlight the application’s effectiveness in delivering timely information and early warnings, facilitating coordination between Japanese authorities and Indonesian representatives, including the Embassy in Tokyo and the Consulate General in Osaka, for crisis management. Although digital diplomacy has been widely analyzed in the context of public diplomacy and social media, its application in disaster management remains underexplored. The Safety Tips for Disaster application emerged as a model that Indonesia could adopt to strengthen its digital diplomacy strategies, thereby improving the safety and readiness of its citizens during natural disasters in Japan
The effect of attitude, subjective norm, perceived behavioral control and gender on whistleblowing intention
No full textResearch aims: This study aims to investigate the impact of Attitudes, Subjective Norms, Perceived Behavioral Control, and Gender on Whistleblowing Intentions among auditors.Design/Methodology/Approach: The research uses Attitudes, Subjective Norms, Perceived Behavioral Control, and Gender as independent variables, with Whistleblowing Intention as the dependent variable. The sample consists of 202 auditors working at Public Accounting Firms (PAF) in East and South Jakarta. Data were analyzed using SmartPLS version 4.0.93.Research findings: The results show that Attitudes, Subjective Norms, and Perceived Behavioral Control positively influence whistleblowing intentions. However, Gender does not have a significant effect. Collectively, the variables influence whistleblowing intentions, with an adjusted R-square of 32.10%.Theoretical Contribution/Originality: This study expands the limited research on whistleblowing in Indonesia, particularly among external auditors, and provides empirical evidence concerning behavioral factors influencing whistleblowing intentions.Practitioner/Policy implication: The findings offer guidance for organizations in developing effective training, internal policies, and reporting systems to strengthen whistleblowing culture and support fraud prevention.Research limitation/Implication: Whistleblowing intentions are explained by only 32.10% of the tested variables, indicating that 67.90% is influenced by other factors such as religiosity, professionalism, and perceived good governance. Future research should include additional variables and larger samples to capture broader behavioral dynamics
Exploring financial reporting quality: Evidence from Indonesian local governments
No full textResearch aims: This study examines the influence of government personnel competence, goods and services expenditure, and infrastructure availability on the quality of local government financial reporting in Indonesia, with local government size as a moderating variable.Design/Methodology/Approach: This quantitative study uses secondary data from local government financial statements in 2020. The sample consisted of 537 local governments selected through purposive sampling. Data were analyzed using Moderated Regression Analysis (MRA).Research findings: The finding show that government personnel's competence positively affects financial reporting quality. Goods and services expenditure has an adverse effect, while infrastructure availability has no significant effect. Local government size weakens the effect of personnel competence, strengthens the effect of goods and services expenditure, and does not moderate the relationship between infrastructure and reporting quality.Theoretical Contribution/Originality: This study offers a novel perspective by empirically examining the interaction between organizational size and key internal factors (human competence, goods and services expenditure, and infrastructure) that influence the quality of local government financial reporting. It extends agency theory by showing that in decentralized public institutions, the effectiveness of internal mechanisms is contingent upon the scale and complexity of the organization
The Impact of Green Knowledge and Servant Leadership on Green Innovation through Green Self-Efficacy in Toba Caldera Geopark
No full textResearch Aims: This study explores the contribution of green knowledge and servant leadership to green innovation, with green self-efficacy acting as a mediating variable, within the context of hospitality enterprises in the Toba Caldera Geopark region. It aims to examine how green self-efficacy mediates the relationship between green knowledge, servant leadership, and green innovation, addressing an empirical gap in geotourism-related studies in Indonesia.Design/Methodology/Approach: A quantitative approach was employed, with data collected from 80 hospitality employees operating in the Toba Caldera Toba Caldera Geopark area using structured questionnaires. The relationships among the variables were analyzed using Partial Least Squares-Structural Equation Modeling (PLS-SEM).Research Findings: The findings show that both green knowledge and servant leadership significantly and positively influence green self-efficacy. Furthermore, green self-efficacy is confirmed as a significant mediator in the relationship with green innovation. The indirect effects mediated by self-efficacy were found to be stronger than the direct effects, emphasizing the role of psychological confidence in fostering employee-driven innovation.Theoretical Contribution/Originality: This study contributes to the literature on sustainable hospitality management by highlighting the role of self-efficacy in green innovation models. It also expands the understanding of how green knowledge and servant leadership interact to promote environmentally friendly behavior in hospitality enterprises.Practical Implications: The study underscores the need for hotel management to enhance environmental training programs and adopt a servant leadership style that encourages green initiatives. It provides practical strategies for improving sustainability efforts in hospitality businesses, especially in geotourism destinations.Research Limitations/Implications: The study is limited by its geographic focus on the Toba Caldera Geopark region, and its findings may not be directly applicable to other regions or sectors. Future research with a broader sample and across diverse geotourism contexts is needed to generalize the results
Clinical outcomes of tooth-supported overdenture retained with metal medium copings, bare root, and magnetic attachment
No full textAn overdenture is a removable dental prosthesis that replaces missing teeth and covers or rests on one or more remaining natural teeth. It represents a conservative prosthodontic approach that preserves tooth structure, maintains proprioception, and minimizes alveolar bone resorption. Although implant-supported prostheses have become popular, preserving natural roots through tooth-supported overdentures remains a valid and cost-effective treatment modality, particularly for elderly patients with limited bone support or financial constraints. This report aims to emphasize the continued relevance of tooth-supported overdentures in prosthodontic rehabilitation. A 73-year-old woman presented with difficulty in chewing and speaking due to multiple missing teeth in both arches. After clinical and radiographic evaluation, a mandibular overdenture was fabricated to enhance stability, retention, and sensory response, using metal medium copings and bareroot. The maxillary arch was restored with a magnet-supported overdenture for additional retention. Post-treatment evaluation showed satisfactory esthetics, comfort, and masticatory efficiency. The patient expressed high satisfaction with the outcome. This case highlights that tooth-supported overdentures—when carefully planned and executed—remain a practical, biologically conservative, and cost-effective alternative to implant-supported options, particularly for elderly patients with few remaining teeth