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ESTIMATION AND MINIMIZATION OF HARMONICS IN IEEE 13 BUS DISTRIBUTION SYSTEM WITH ADJUSTABLE SPEED DRIVE LOADS USING PASSIVE FILTERS
Get PDFImproving power quality in electrical distribution systems is increasingly important with the increasing use of nonlinear loads, such as Adjustable Speed Drive (ASD), which can produce harmonies. This harmonic has the potential to damage equipment, reduce system efficiency, and interfere with power quality. Distribution systems such as IEEE 13 Bus are often used for power quality management analysis. Through simulation, researchers can identify the source and impact of harmonics and evaluate solutions, such as the application of passive filters that absorb or divert harmonic currents, to reduce their negative effects in the distribution system. In this study, two power sources, several transformers, static loads, and nonlinear loads in the form of Adjustable Speed Drive (ASD) were used. The simulation was carried out using Simulink R2019b to model the distribution network, generators, transformers, and loads. The simulation results show that the Adjustable Speed Drive (ASD) load can produce a total harmonic current distortion (THDi) of 24.62% in bus 7, while the total harmonic voltage distortion (THDv) is 0.97%. To minimize harmonic values, passive filters with variations of RL, RC, LC, and RLC are used. The results show that the use of RL passive filters is more effective in reducing THDi and THDv values in bus 7 by 24.47% and 0.97%
Method of Extracting Speech Characteristics of Bugis Regional Language
Get PDFhis research focuses on developing an application to extract speech signal characteristics of Bugis regional speakers using Matlab and Wavesurfer software. The study centers on feature extraction, specifically Short Time Energy (STE), Autocorrelation Cepstral for pitch extraction, and Cepstrum Linear Predictive Coding (LPC) for formant analysis. Results indicate that male voices have greater signal energy than female voices. The pitch values for male speakers range from 52.29 Hz to 135.76 Hz, while female speakers' pitch ranges from 73.39 Hz to 242.42 Hz. The formant analysis showed that male and female speakers have distinct formant frequencies, with male speakers having lower formant frequencies. For instance, the first formant (f1) in male speakers ranges from 433.0 Hz to 590.3 Hz, while in female speakers it ranges from 273.9 Hz to 452.8 Hz. The pitch of male voices is concentrated between 50 Hz and 250 Hz, whereas female voices fall between 120 Hz and 500 Hz. Additionally, differences in formants (f1 to f5) were observed in the word "na'baca," with female speakers generally having higher formant frequencies. This analysis provides valuable insights into the acoustic characteristics of the Bugis regional language. The developed application aims to enhance speech signal processing technologies, supporting applications like speech recognition, linguistic analysis, and voice synthesis, contributing to the preservation of the Bugis language through signal processing techniques
Unraveling Audit Fee Dynamics: How Auditor Reputation Moderates Corporate Attributes in the Middle Eastern Landscape
Get PDFThis study investigates the determinants of audit fees in publicly listed healthcare firms across Middle Eastern stock exchanges during the 2022–2024 period. Specifically, it examines how firm risk, firm size, and firm profitability influence audit fees, with auditor reputation introduced as a moderating variable. Using a dataset of 273 firm-year observations and applying multiple linear regression analysis, the findings reveal that firm size has a significant positive effect on audit fees, while firm profitability and firm risk both exhibit significant negative effects. Additionally, auditor reputation strengthens the positive relationship between firm size and audit fees but does not significantly moderate the relationship between profitability and audit fees. Interestingly, auditor reputation weakens the negative effect of firm risk on audit fees, suggesting nuanced pricing strategies among highly reputable auditors. These results contribute to a deeper understanding of audit fee dynamics within a sector and region that remain underexplored in existing literature. The study also highlights the importance of considering contextual factors such as audit firm reputation when evaluating audit cost structures
Analysis of Coretax System Implementation at the Abdul Rachman Tax Accountant and Consultant Services Office: Technology Acceptance Model Approach
Get PDFBased on the Decree of the Minister of Finance Number KMK-885/KMK.03/2016 on the Establishment of the Tax Reform Team (Reform Team) tasked with reforming the tax system in Indonesia, the coretax system was created. Coretax or Coretax Administration System, is a technology-based system that modernizes the management of tax administration through the application of more sophisticated information technology. The research method used is a qualitative method conducted at the Abdul Rachman Tax Accountant and Consultant Services Office. Data will be obtained by conducting direct interviews with the leadership and 2 staff at KJA and KKP Abdul Rachman regarding the coretax system that has been operated with the triangulation analysis method. The results of the study show that the implementation process of the Coretax system is carried out in stages through simulation activities, training, workshops, and internal adaptation. However, substantive challenges were also found, such as system instability, failures in the creation of billing codes, data insynchronization between Coretax and Webinvoice, as well as system features that have not worked optimally, such as errors when editing tax invoices that have been uploaded. These technical issues have a direct impact on operational activities, lead to delays in client reporting, and in some cases pose a risk of late sanctions. This study uses TAM (Technology Acceptance Model) as an analysis tool by grouping the interview findings into two main constructs, namely perceived usefulness and perceived ease of use. The two constructs of TAM ease of use and usefulness are not only the theme of the results, but also an analytical tool to answer the formulation of this research problem, namely, low ease of use due to technical constraints to early adoption barriers, high usefulness is the main motivation for use even though there are technical obstacles
English for Occupational Purposes (EOP): Public and Environmental Health Employees’ Needs for English Language
Get PDFEnglish language is of great demand in all sectors and professional purposes are no exception. This is because learners of English language have become aware of the role that it plays in both academic and professional purposes. Employees who have a good command of English language can serve their area well, so it is necessary to cater for those employees’ needs for English language regardless their area of specialization to raise their employability. This paper aimed at analysing Public and Environmental Health (PEH) employees' needs for English for Occupational Purposes (EOP) to identify their use of English in their job, English usefulness to them, their present situation in English, and the most important language skills to them. The study adopted mixed method design. Data were collected through a questionnaire and a structured interview. The participants were 29 employees and two heads of departments at the Ministry of Health, Khartoum State, Sudan. Results showed that PEH employees frequently used English in their jobs. It is also revealed that English language was useful to the participants in their jobs. The employees’ proficiency was found to be good according to them, but it was regarded as average by the interviewees. All the language skills were considered important. The study recommends that the Ministry of Health, Khartoum State, should consider this NA results to prepare training courses in English for its employees
Written Discourse Performance of Senior High School Students: Designing Genre-Based Instructional Material
Get PDFThis study investigates the written discourse performance of Grade 11 senior high school students with a focus on designing genre-based instructional material. The research encompasses a detailed examination of demographic profiles, reading material preferences, and academic strands to provide comprehensive understanding of students' backgrounds. Methodologically, quantitative approach was employed, involving writing a position paper collection from 258 respondents across various schools. Data analysis included descriptive statistics and inferential tests to identify the level of written discourse performance and significant factors influencing written discourse competence. Findings reveal significant challenges in students' written discourse performance, particularly in organization and transitional signals appropriacy. A notable proportion of students demonstrated deficiencies in these areas, highlighting the need for targeted interventions in writing instruction. The study also underscores the impact of students' reading habits on their writing proficiency, emphasizing the beneficial role of diverse reading materials such as journals and literary works. Gender-based analysis indicates an equitable distribution of writing abilities between male and female students, suggesting inclusive instructional strategies effectively support learners. The study concludes by proposing genre-based instructional materials tailored to students' reading preferences and academic contexts. These materials aim to address identified deficiencies in written discourse performance and enhance overall language proficiency
Rancang Bangun Sistem Hybrid Grid Connected Skala Laboratorium Berbasis Piezoelectric dan Tenaga Surya
Get PDFKebutuhan energi listrik yang terus meningkat menggambarkan kemajuan masyarakat. Untuk memenuhi kebutuhan energi listrik ini, diperlukan sebuah pembangkit listrik. Di sisi lain, pembangkitan energi listrik dari sumber daya fosil, yang selama ini menjadi andalan, harus diminimalkan. Indonesia adalah negara tropis, sehingga memiliki dua musim, yaitu musim hujan dan musim kemarau dengan potensi energi matahari yang baik dengan rata-rata insolasi harian 4,8 kWh/m2/hari. Energi termal matahari dapat dimanfaatkan dengan bantuan salah satu alat, yaitu sel surya yang mengubah radiasi matahari menjadi energi listrik. Namun, pada musim hujan, pemanfaatan energi matahari tidak optimal, sehingga untuk mendukung hal ini, dibuatlah sistem pembangkit listrik tenaga surya hibrida (PLTS) dengan pembangkit listrik piezoelektrik (PLTP) yang merupakan transduser aktif dengan prinsip kerja menghasilkan listrik dari bahan kristalin akibat tekanan atau gaya dari matahari. Perancangan alat ini bertujuan untuk penggunaan daya listrik PLN yang efisien dengan menggabungkan PLTS dan PLTP yang disebut dengan sistem hibrida terhubung ke jaringan. Perancangan alat ini dilakukan untuk menghemat penggunaan sumber daya PLN, selain itu juga bertujuan untuk meningkatkan pengetahuan tentang sumber energi alternatif untuk PLTS dan PLTP dari desain konstruksi, prosedur kerja, komponen dan bahan alat, perhitungan spesifikasi alat, serta perakitan komponen alat tersebut. Berdasarkan hasil desain yang telah dilakukan dan pengujian alat, dapat disimpulkan bahwa penggunaan alat sistem hibrida terhubung ke jaringan berbasis piezoelektrik dan surya sangat dianjurkan untuk penggunaan skala rumah tangga karena dapat menghemat penggunaan daya PLN, namun terdapat hambatan karena kurangnya spesifikasi piezoelektrik, sehingga desain untuk pengisi daya baterai kurang maksimal dimana perhitungan teoretis 54 komponen piezoelektrik berdasarkan pengamatan osiloskop terhadap tegangan DC adalah 38,6 V. Tegangan yang seharusnya tercapai untuk pengisi daya baterai tidak sesuai dengan kenyataan
PELATIHAN PEMBUATAN PAKAN FERMENTASI UNTUK AYAM KAMPUNG DI KELUARAHAN ALEHANUAE KECAMATAN SINJAI UTARA KABUPATEN SINJAI PROVINSI SULAWESI SELATAN
Get PDFMost residents of Alehanuae Village in Sinjai District, North Sinjai Subdistrict are engaged in farming, specifically in raising cattle and native chickens. The local chickens are typically allowed to forage freely for food, while others are housed in enclosures with commercially purchased feed, which is often costly and leads to slower growth and development. The primary objective of the PKM initiative is to equip the society with the knowledge and skills necessary to produce fermented feed for native chickens using easily accessible ingredients. The anticipated outcome is the establishment of a local chicken farming business that utilizes this self-made feed. The initiative is structured in two phases: exposure and practical application. In the practical phase, participants engage in activities such as tool and material preparation, ingredient drying, mixing, fermentation, and application to local chickens. Overall, the PKM initiative is well-understood by farmer groups. Results indicate a significant improvement in partners’ abilities to convert agricultural waste into fermented feed, with knowledge and skill enhancement reaching up to 90% during the program’s implementation.
Keywords: fermented feed, native chicke
PEMANFAATAN MESIN PENCACAH MULTI FUNGSI UNTUK PENGEMBANGAN BUDIDAYA TERNAK SAPI LEMBU JAYA MANUNGGAL DI DESA MANUNGGAL JAYA KEC. TENGGARONG SEBERANG KAB. KUTAI KARTANEGARA
Get PDFThe Lembu Jaya Livestock Farmers Group has Cattle and Goat Farming bussiness. The problem faced by breeders group is feed procesing takes quite long time and if they are given food conventionally, causes slow livestock growth and wastes feed. There are also problems with marketing their livestock products. The Implementing this PKM is to help partners problems by providing multifunctional chopping machines and business management training. The feed processing process, which until now was still manual by chopping (cutting) or even leaving it, was replaced by using this chopping machine. This machine capable of chopping grass and tree branches and also as flour (corn and cobs) with a capacity of 250 kg/hour. From the original feed requirement before using the chopper of 75 kg for every 10 goats to 50 kg for every 10 goats, there was a savings of 33%. This happens because the chopped stems and leaves completely consumed by goats/cows. Another result that can be seen is the growth in livestock weight which has increased by 200% every month. Business management training (entrepreneurship, organizational management, marketing management and group administration) can help this group in marketing livestock products and market the results of their business competitive prices.
Keywords: Chopping Machine, Animal Feed, Cow, Goat