Portal Jurnal Politeknik Negeri Semarang
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Horizontal Axis Wind Turbine Efficiency Optimization Through Tip Radius Modification on 4:5 Flat Taper Blades
Get PDFThis study aims to investigate how changing the roundness of the back edge of blades affects a 4:5 flat taper wind turbine. Tests used blades with 5 mm, 10 mm, and 15 mm rounded edges, compared to a 5 mm notched blade, across wind speeds from 3 to 9 m/s. The results show the 5 mm rounded edge works best at low wind speeds, with an efficiency of 11.12% at 3 m/s. At higher wind velocities, the 15 mm rounded blade demonstrated superior aerodynamic performance, attaining an efficiency of 1.63% at 7 m/s. The rounded trailing edge improved aerodynamic behavior by minimizing turbulence and enhancing flow stability. Therefore, the optimal edge radius should be determined based on regional wind characteristics, especially for low-speed wind zones typical of Indonesi
Influence of Price Increases, Product Availability, and Service Quality on Consumer Satisfaction (A Case Study at LPG 3 Kg Distribution Point Yulianto, agent of PT Mita Ereska, Semarang Regency)
Get PDFLiquefied Petroleum Gas (LPG) 3 kg is an essential basic need for low- to middle-income communities in Indonesia. Price increases, limited product availability, and service quality are factors that can affect consumer satisfaction with this subsidized product. This study aims to analyze the influence of price increases, product availability, and service quality on consumer satisfaction at distribuiton point LPG 3 kg Yulianto, an agent of PT Mita Ereska in Semarang Regency. The research used a quantitative method with a multiple linear regression approach. Data were collected through questionnaires distributed to 89 respondents. The results show that price increases have a negative and significant effect on consumer satisfaction, while product availability and service quality have a positive and significant effect. The regression equation obtained is Y = 4.361 − 1.375X1 + 1.834X2 + 1.308X3. The significance values from both the t-test and F-test are < 0.05, indicating that all three variables have a significant effect both partially and simultaneously. The Adjusted R Square value of 0.513 indicates that 51.3% of the variation in consumer satisfaction is explained by the three independent variables, while the remaining 48.7% is influenced by other factors not examined in this study. The study concludes that improving service quality and managing product availability are essential to maintaining consumer satisfaction despite price increases.
Liquefied Petroleum Gas (LPG) 3 kg merupakan kebutuhan dasar bagi rumah tangga berpenghasilan rendah hingga menengah di Indonesia. Faktor-faktor seperti kenaikan harga, keterbatasan ketersediaan produk, dan kualitas layanan dapat memengaruhi kepuasan konsumen terhadap produk bersubsidi ini. Penelitian ini mengkaji pengaruh kenaikan harga, ketersediaan produk, dan kualitas layanan terhadap kepuasan konsumen di titik distribusi LPG 3 kg Yulianto, agen PT Mita Ereska di Kabupaten Semarang. Pendekatan kuantitatif dengan regresi linier berganda digunakan, dan data dikumpulkan dari 89 responden menggunakan kuesioner. Hasil penelitian menunjukkan bahwa kenaikan harga berpengaruh negatif terhadap kepuasan konsumen, sedangkan ketersediaan produk dan kualitas layanan berpengaruh positif. Model regresi menunjukkan bahwa ketiga variabel secara signifikan memengaruhi kepuasan konsumen baik secara individual maupun simultan. Nilai Adjusted R² sebesar 0,513 menunjukkan bahwa 51,3% variasi kepuasan konsumen dijelaskan oleh variabel-variabel ini, sedangkan 48,7% sisanya dipengaruhi oleh faktor-faktor lain. Temuan ini menyoroti pentingnya meningkatkan kualitas layanan dan mengelola ketersediaan produk untuk mempertahankan kepuasan konsumen meskipun terjadi kenaikan harga
Factors Influencing Suzuki Motorcycle Purchase Decisions
Get PDFThe emergence of competition among several brands in Indonesia has forced dealers to compete. Companies are required to understand consumer behavior to offer quality products and excellent service to attract consumers. This study aimed to identify and analyze the impact of brand image, brand experience, and service quality on Suzuki motorcycle purchase decisions at PT Indo Sunmotor Gemilang. The population of this study was customers of PT Indo Sunmotor Gemilang Semarang. The sample used in this study consisted of 120 respondents selected using a purposive sampling method. The research method used was quantitative research, with data collection through literature review and questionnaire distribution. An interval scale was used in the questionnaire to measure respondents' perceptions. The analytical methods in this study included descriptive analysis, instrument testing, classical assumption testing, multiple linear regression analysis, and hypothesis testing. All data analysis was performed using SPSS version 25 software. The results revealed a regression equation connecting the variables: Y = 8.185 + 0.455X1 + 0.557X2 + 0.367X3. Therefore, the conclusion is that brand image (X1), brand experience (X2), and service quality (X3) have a positive and significant influence on purchase intention (Y).
Timbulnya persaingan yang diantara beberapa merek di Indonesia membuat dealer-dealer saling berlomba untuk dapat bersaing. Perusahaan dituntut untuk memahami perilaku konsumen untuk menawarkan produk-produk yang berkualitas dan pelayanan yang baik guna mendapatkan perhatian dari konsumen. Penelitian ini dilakukan dengan tujuan untuk mengidentifikasi dan menganalisis dampak dari brand image, brand experience dan service quality terhadap purchase decision sepeda motor merek Suzuki pada PT Indo Sunmotor Gemilang. Populasi yang menjadi penelitian ini adalah para pelanggan PT Indo Sunmotor Gemilang Semarang. Sampel yang digunakan pada penelitian ini terdiri dari 120 responden yang dipilih menggunakan metode purposive sampling. Jenis penelitian yang dijalankan adalah penelitian kuantitatif, dengan pengumpulan data melalui studi pustaka dan distribusi kuesioner. Skala interval digunakan dalam kuesioner untuk mengukur persepsi responden. Metode analisis dalam penelitian ini melibatkan analisis deskriptif, uji nstrument, pengujian asumsi klasik, penerapan analisis regresi linear berganda dan pengujian hipotesis. Seluruh analisis data dijalankan menggunakan perangkat lunak SPSS versi 25. Berdasarkan hasil perhitungan, ditemukan persamaan regresi yang menghubungkan variabel-variabel, yaitu Y = 8,185 + 0.455X1 + 0,557X2 + 0,367X3. Oleh karena itu, Kesimpulan yang dapat diambil adalah bahwa brand image (X1), brand experience (X2) dan service quality (X3) memiliki pengaruh positif dan signifikan terhadap purchase (Y)
Do Corporate Governance, Sustainability Reporting, and Gender Diversity Have a Financial Performance Impact? Evidence Indonesia and Malaysia Bank
Get PDFMany studies state that governance and sustainability affect financial performance, and transparent disclosure is considered capable of increasing stakeholder trust in corporate responsibility towards the environment, however, some researchers assume that governance and sustainability reports do not have a positive impact on financial performance and are considered only a burden and only to comply with regulations. This study attempts to fill this gap in the literature by testing the impact of governance disclosure and sustainability reporting by adding gender diversity variables as a moderation, female directors are believed to be more critical and able to increase stakeholder trust. This study uses a panel regression model on a sample of 54 banks registered in Indonesia and Malaysia in 2022. Effective governance can overcome the agency theory and moral hazard problems that commonly occur in the banking industry, such that bank performance, as measured by Tobin's q, increases because stakeholders feel that greater disclosure of governance can have a positive effect on financial performance. Disclosure of sustainability reporting in the banking industry not only complies with regulations but also has a positive effect on financial performance. Sustainability reporting integration into core business strategies is likely to play an important role in driving long-term financial success and increasing stakeholder confidence in bank performance. Gender diversity positively moderates corporate governance practices, sustainability reporting, and, ultimately, superior financial performance. Gender diversity in the ranks of company directors is an important factor in improving corporate governance, sustainability reporting practices, and financial performance. The benefits of gender diversity extend to various organizational dimensions, underscoring its significance as a strategic asset in the contemporary corporate governance paradigm
Determinants of ESG Disclosure in ASEAN-5 Countries: A Legitimacy and Institutional Theory Approach
Get PDFESG disclosure among basic materials firms in the ASEAN-5 countries remains uneven, with notable implementation gaps. Drawing on legitimacy and institutional theories, this study employs moderated regression analysis on 185 firms from a population of 2.110 during 2019–2023 to identify key determinants of ESG reporting. Results reveal that carbon emission intensity and product disclosure. Results show that higher carbon emission intensity leads to greater ESG disclosure, suggesting firms seek legitimacy by providing extensive ESG information despite higher emissions. Firms with more diversified products also exhibit higher ESG disclosure, as complexity requires transparency to manage environmental and social risks. Contrary to expectations, business environmental uncertainty does not significantly influence ESG disclosure, supporting contingency theory’s view that no single strategy fits all firms in navigating uncertainty. Geographic location negatively affects ESG disclosure, highlighting resource constraints and underdeveloped ESG infrastructure, particularly in Indonesia. Gender diversity significantly moderates the effects of environmental uncertainty and geographic location, strengthening their impact on ESG disclosure. However, its interaction with carbon emission intensity and product diversification is not significant. These findings deepen understanding of the institutional and legitimacy factors influencing ESG disclosure in emerging markets
Moderating Role of Community Participation in the Relationship between Organizational Commitment, Good Corporate Governance, and Apparatus Performance
Get PDFThis study aims to analyze the influence of organizational commitment and Good Corporate Governance (GCG) on the performance of village officials, and to test the moderating role of community participation in the relationship. This study uses a quantitative approach with a survey method, involving 72 respondents consisting of officials and the community in Pakisaji District, Malang Regency. The data analysis technique uses Moderated Regression Analysis (MRA). The results of the study indicate that organizational commitment and the implementation of GCG principles have a significant effect on improving the performance of officials. Community participation also has a positive effect on the performance of officials, and significantly moderates the relationship between organizational commitment and official performance. However, community participation does not significantly moderate the relationship between GCG and official performance, indicating that the effectiveness of participation depends on the quality and structure of community involvement. These findings provide empirical contributions to the development of participatory and accountable village governance, as well as strengthening the role of internal and external factors in driving official performance
Electrical Power Prediction of Polycrystalline Solar Panels based on LSTM Model with environmental influence
Get PDFSolar energy is one of the most promising renewable energy sources that can support the sustainable energy transition. However, the electrical power produced by photovoltaic (PV) panels is greatly influenced by environmental conditions such as irradiation, temperature, humidity, and wind speed, making them volatile and difficult to predict. This study aims to develop a prediction model based on Long Short-Term Memory (LSTM) to estimate the power output of polycrystalline panels. Environmental data is collected in real-time, processed through the normalization stage, and then used as input in several model variants, namely pure LSTM, CNN-LSTM, LSTM-Autoencoder, and GWO-LSTM with metaheuristic optimization. Evaluation was conducted using R², RMSE, and MAPE metrics. The results showed that the pure LSTM model provided good accuracy (R² = 0.95; MAPE = 6.2%), while CNN-LSTM and LSTM-AE improved performance with R² reaching 0.97 and 0.96, respectively. The best model is GWO-LSTM, with R² = 0.98, RMSE = 0.31 kW, and MAPE = 4.3%. These findings prove that metaheuristic optimization in LSTM can increase the reliability of PV power prediction and support a more efficient energy management system
PENGARUH STRUKTUR KEPEMILIKAN, DEBT TO EQUITY RATIO, DAN UKURAN PERUSAHAAN TERHADAP KEBIJAKAN DEVIDEN
Get PDFKebijakan deviden merupakan keputusan manajemen perusahaan terkait dengan pembagian laba bersih kepada pemegang saham dalam bentuk deviden atau disimpan sebagai laba ditahan untuk pembiayaan investasi di masa depan. Penelitian ini memiliki tujuan untuk menguji Pengaruh Struktur Kepemilikan, Debt To Equity Ratio, Dan Ukuran Perusahaan Terhadap Kebijakan Deviden. Populasi pada penelitian ini yaitu perusahaan sektor infrastruktur yang terdaftar di Bursa Efek Indonesia pada periode 2021-2023. Pengambilan sampel menggunakan metode purposive sampling yang diperoleh 66 sampel. Penelitian ini menggunakan data sekunder yang diambil dari laporan keuangan. Data penelitian ini dianalisis dengan menggunakan regresi linear berganda. Hasil penelitian ini menunjukkan bahwa Kepemilikan Manajerial tidak berpengaruh terhadap Kebijakan Deviden, Kepemilikan Institusional berpengaruh positif terhadap Kebijakan Deviden, Debt to Equity Ratio berpengaruh negatif terhadap Kebijakan Deviden, Ukuran Perusahaan tidak berpengaruh terhadap Kebijakan Deviden