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Leadership Style, Motivation, and Work Environment on Job Satisfaction and Employee Performance at the Environment and Hygiene Department of Pekanbaru City Wahyudi, Langgeng; Panjaitan, Harry Patuan; Junaedi, Achmad Tavip
Journal of Applied Business and Technology Vol. 4 No. 1 (2023): Journal of Applied Business and Technology
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/jabt.v4i1.119

Abstract

This study aims to analyze the influence of leadership style, motivation, and work environment on job satisfaction and employee performance at the Pekanbaru City Environment and Hygiene Service. This research is quantitative research by distributing questionnaires to respondents. The sample selection method in this study used the census method so the sample in this study amounted to 58 respondents. Data analysis using Structural Equation Modeling (SEM) using the SmartPLS 3 application. The results of this study indicate that leadership style has no significant effect on job satisfaction, leadership style has no significant effect on performance, the work environment has a positive and significant effect on job satisfaction, and the work environment has no significant effect on job satisfaction. significant effect on performance, motivation has no significant effect on job satisfaction, motivation has a positive and significant effect on performance, and job satisfaction has a positive and significant effect on employee performance.
Mapping the Financial Technology Industry in Indonesia Renaldo, Nicholas; Junaedi, Achmad Tavip; Musa, Sulaiman; Wahid, Nabila; Cecilia, Cecilia
Journal of Applied Business and Technology Vol. 5 No. 1 (2024): Journal of Applied Business and Technology
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/jabt.v5i1.162

Abstract

This study aims to deepen the fintech landscape in Indonesia with focus on types of fintech, companies popular, and the role of fintech market aggregators. With internet penetration reached 67%, Indonesia became lush backdrop for fintech innovation, supported by regulation and proactive government to support the growth sector This. Methodology study combine study literature, studies cases, interviews with holder interests, research field, analysis statistics, SWOT analysis, surveys users, and analysis continuity. The literature review provides a base for understanding global fintech trends, interim studies case detail development leading fintech companies like My Capital, Friends Money, and Kredivo. Research result covers identification four main types of fintech in Indonesia: P2P Lending and Crowdfunding, Management Risk Investment, Payment-Clearing-Settlement, and Market Aggregator. Fintech market aggregators such as Cekaja.com, Cermati.com, and DuitPintar.com play role important in give information and comparison product finance to consumer. With results study This is expected can give understanding deep about the evolution of fintech in Indonesia, as well give base for policy public, developers business, and internal investors optimizing growth and inclusion finance in the digital era.
Service Quality, Institutional Image and Satisfaction : Can Drivers Student Loyalty? Wijaya, Evelyn; Junaedi, Achmad Tavip; Hocky, Agus
APMBA (Asia Pacific Management and Business Application) Vol. 9 No. 3 (2021)
Publisher : Department of Management, Faculty of Economics and Business, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.apmba.2021.009.03.7

Abstract

Education is dynamic and always developing to keep it up to date with today's condition. The government always puts an effort so that the education quality in Indonesia will not be left behind compared to other countries in the world. One of the aspects stimulating the changes is customer demand over the quality of the education system. This study also aimed at analyzing the influence of service quality on the satisfaction and loyalty of senior high school or SMA students. The data used in this study were primary data with a total respondent of 88 students. The technique for data analysis used in this study was path analysis assisted by Smart PLS. The research findings showed that service quality and institutional image significantly influenced satisfaction, yet they did not influence loyalty significantly. Meanwhile, satisfaction directly influenced loyalty. Further study is suggested to add several variables, such as perceived value, perceived quality, and the like that are considered giving an influence on creating student’s loyalty. Practical implications also drawn to conclude this study.
BRAND IMAGE, SOCIAL DIGITAL MARKETING, AND PRODUCT INNOVATION ON CONSUMER SATISFACTION OF CHATIME DRINKS IN PEKANBARU Achmad Tavip Junaedi; Dhea Anggelina; Nicholas Renaldo; Suhardjo Suhardjo; Jahrizal Jahrizal; Emiliana Shania Meta Nahak
Procuratio : Jurnal Ilmiah Manajemen Vol 12 No 4 (2024): Procuratio : Jurnal Ilmiah Manajemen
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/procuratio.v12i4.4693

Abstract

The purpose of this study was to determine and analyze the effect of brand image, social digital marketing, and product innovation on consumer satisfaction of Chatime drinks in Pekanbaru. This research was conducted in Pekanbaru City. The time of this research started from September 2023 and ended in December 2023. This research was conducted in Pekanbaru City on people who had bought Chatime drinks. Because the population is not known for certain, using the Roscoe approach, the number of samples was determined as 120 people using the purposive sampling technique. Data analysis used multiple linear regression. The results of the study explain that brand image has a positive and significant influence, then social digital marketing also has a positive and significant influence, and product innovation also has a positive and significant influence on consumer satisfaction with Chatime drinks in Pekanbaru. Tujuan dalam penelitian ini adalah untuk mengetahui dan menganalisis pengaruh brand image, sosial digital marketing dan inovasi produk terhadap kepuasan kinsmen minuman Chatime di Pekanbaru. Penelitian ini dilakukan di kota Pekanbaru. Waktu penelitian ini dimulai dari bulan September 2023 dan berakhir pada bulan Desember 2023. Penelitian ini dilaksanakan di kota Pekanbaru pada masyarakat yang pernah melakukan pembelian minuman Chatime. Karena populasi dalam tidak diketahui jumlahnya dengan pasti, maka dengan pendekatan roscoe ditetapkan jumlah sampel sebanyak 120 orang menggunakan teknik purposive sampling. Analisis data yang digunakan regresi linier berganda. Hasil penelitian menjelaskan bahwa brand image memiliki pengaruh positif dan signifikan, selanjutnya sosial digital marketing juga berpengaruh positif dan signifikan dan inovasi produk juga memiliki pengaruh positif dan signifikan terhadap kepuasan konsumen minuman Chatime di Pekanbaru.
PERCEPTIONS OF BENEFITS AND SECURITY ON CONFIDENCE AND DECISIONS IN USING DIGITAL WALLET APPLICATIONS (E-WALLET) IN PEKANBARU CITY Achmad Tavip Junaedi; Astuti Dara Anjeli; Nicholas Renaldo; Suhardjo Suhardjo; Aulia Ramadhani; Indri Yovita
Procuratio : Jurnal Ilmiah Manajemen Vol 13 No 3 (2025): Procuratio : Jurnal Ilmiah Manajemen
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/procuratio.v13i3.5238

Abstract

This research aims to determine and analyze the influence of perceived benefits and security on trust and decision-making of e-wallet users in the city of Pekanbaru. The population of this study comprises all e-wallet application users in Pekanbaru, with a sample size of 200 users as respondents. The sampling technique employed is non-probability sampling, specifically accidental sampling. Data collection is conducted through the use of a questionnaire. Data analysis is carried out using Structural Equation Modeling Partial Least Square (SEM-PLS). The results of the study indicate that perceived benefits and security have a positive and significant impact on trust among e-wallet users in Pekanbaru. Additionally, perceived benefits have a positive and significant influence on the decision-making of e-wallet users in Pekanbaru, while security has a small, insignificant effect on decisions in Pekanbaru City. Penelitian ini bertujuan untuk mengetahui dan menganalisis pengaruh persepsi manfaat dan keamanan terhadap kepercayaan serta pengambilan keputusan pengguna e-wallet di Kota Pekanbaru. Populasi penelitian ini mencakup seluruh pengguna aplikasi e-wallet di Pekanbaru, dengan jumlah sampel sebanyak 200 responden. Teknik pengambilan sampel yang digunakan adalah non-probability sampling, khususnya accidental sampling. Pengumpulan data dilakukan melalui penyebaran kuesioner, sedangkan analisis data menggunakan metode Structural Equation Modeling Partial Least Square (SEM-PLS). Hasil penelitian menunjukkan bahwa persepsi manfaat dan keamanan berpengaruh positif dan signifikan terhadap kepercayaan pengguna e-wallet di Pekanbaru. Selain itu, persepsi manfaat juga berpengaruh positif dan signifikan terhadap pengambilan keputusan pengguna e-wallet di Pekanbaru, sedangkan keamanan memiliki pengaruh positif namun tidak signifikan terhadap keputusan di Kota Pekanbaru.
PROMOTION, INFLUENCER MARKETING, AND ONLINE CUSTOMER REVIEW ON PURCHASE DECISIONS IN SHOPEE E-COMMERCE (A CASE STUDY ON THE COMMUNITY IN PEKANBARU) Achmad Tavip Junaedi; Nabila Hestia; Suhardjo Suhardjo; Jenny Angelica; Nicholas Renaldo; Amries Rusli Tanjung; Novita Yulia Putri; Marice Br Hutahuruk; Yusnidar Yusnidar; Muhammad Adrian Agusta
Procuratio : Jurnal Ilmiah Manajemen Vol 13 No 1 (2025): Procuratio : Jurnal Ilmiah Manajemen
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/procuratio.v13i1.4920

Abstract

This research investigates the influence of Promotion, Influencer Marketing, and Online Customer Reviews on purchase decisions in the E-Commerce platform Shopee in Pekanbaru. The determination of the research sample utilizes accidental sampling. This study employs primary data, which is directly obtained from respondents by distributing questionnaires or statement lists to the predetermined sample. Secondary data generally consists of evidence, records, or historical reports organized in published archives. The method used is multiple linear regression analysis with a sample size of 100 respondents. The research findings indicate that Promotion and Online Customer Review significantly influence purchase decisions on Shopee E-commerce in the city of Pekanbaru, while Influencer Marketing does not significantly affect purchase decisions on Shopee E-commerce in the city of Pekanbaru. Penelitian ini bertujuan untuk mengetahui pengaruh Promosi, Influencer Marketing, dan Online Customer Review terhadap keputusan pembelian pada platform E-Commerce Shopee di Pekanbaru. Penentuan sampel penelitian menggunakan teknik accidental sampling. Penelitian ini menggunakan data primer yang diperoleh langsung dari responden dengan cara menyebarkan kuesioner atau daftar pernyataan kepada sampel yang telah ditentukan. Data sekunder pada umumnya berupa bukti-bukti, catatan, atau laporan historis yang terorganisasi dalam arsip yang diterbitkan. Metode yang digunakan adalah analisis regresi linier berganda dengan jumlah sampel sebanyak 100 responden. Hasil penelitian menunjukkan bahwa Promosi dan Online Customer Review berpengaruh signifikan terhadap keputusan pembelian pada E-Commerce Shopee di Kota Pekanbaru, sedangkan Influencer Marketing tidak berpengaruh signifikan terhadap keputusan pembelian pada E-Commerce Shopee di Kota Pekanbaru.
PENGARUH E-COMMERCE, MEDIA SOSIAL, DAN GAYA HIDUP TERHADAP PEMBELIAN FASHION MUSLIM OLEH GENERASI Z DI PEKANBARU Yusnidar Yusnidar; Muhammad Adrian Agusta; Achmad Tavip Junaedi
Procuratio : Jurnal Ilmiah Manajemen Vol 13 No 3 (2025): Procuratio : Jurnal Ilmiah Manajemen
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/procuratio.v13i3.4963

Abstract

This study aims to analyze the influence of E-Commerce, social media, and lifestyle on Muslim fashion purchasing decisions by Generation Z in Pekanbaru City. Generation Z is an age group that is highly exposed to digital technology and tends to have a consumptive lifestyle, especially in terms of fashion that is in accordance with religious identity and current trends. This study uses a quantitative approach with a survey method of 100 Gen Z respondents who actively use e-commerce and social media platforms. Data analysis was carried out using multiple linear regression and moderation analysis to see the role of consumptive lifestyle in strengthening the relationship between social media and purchasing decisions. The results of the study indicate that E-Commerce and social media have a significant influence on Muslim fashion purchasing decisions. In addition, consumptive lifestyle has been shown to strengthen the influence of social media on impulsive buying behavior. These findings indicate the importance of an integrated digital marketing strategy and an in-depth understanding of Gen Z characteristics in developing the Muslim fashion industry in Pekanbaru. Penelitian ini bertujuan untuk menganalisis pengaruh E-Commerce, media sosial, dan gaya hidup terhadap keputusan pembelian fashion muslim oleh Generasi Z di Kota Pekanbaru. Generasi Z merupakan kelompok usia yang sangat terpapar teknologi digital dan cenderung memiliki gaya hidup konsumtif, terutama dalam hal fashion yang sesuai dengan identitas religius dan tren masa kini. Penelitian ini menggunakan pendekatan kuantitatif dengan metode survei terhadap 100 responden Gen Z yang aktif menggunakan platform e-commerce dan media sosial. Analisis data dilakukan menggunakan regresi linier berganda dan analisis moderasi untuk melihat peran gaya hidup konsumtif dalam memperkuat hubungan antara media sosial dan keputusan pembelian. Hasil penelitian menunjukkan bahwa E-Commerce dan media sosial berpengaruh signifikan terhadap keputusan pembelian fashion muslim. Selain itu, gaya hidup konsumtif terbukti memperkuat pengaruh media sosial terhadap perilaku pembelian impulsif. Temuan ini mengindikasikan pentingnya strategi pemasaran digital yang terintegrasi serta pemahaman mendalam terhadap karakteristik Gen Z dalam mengembangkan industri fashion muslim di Pekanbaru.
PROMOTION, MOTIVATION, DIGITAL WORK EXPERIENCE AND JOB SATISFACTION ON EMPLOYEE PERFORMANCE AT PT. INDO RIAU PERKASA Nicholas Renaldo; Anton Anton; Dadi Komardi; Sabrina Sabnah; Achmad Tavip Junaedi; Suhardjo Suhardjo; Jahrizal Jahrizal
Procuratio : Jurnal Ilmiah Manajemen Vol 12 No 4 (2024): Procuratio : Jurnal Ilmiah Manajemen
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/procuratio.v12i4.4789

Abstract

The purpose of this research is to analyze promotion, motivation, work experience and job satisfaction on employee performance. Novelty on this research is using digital work experience as new variable. We add new indicator namely digital skills to ensure that this variable can be used in future research to be developed. This research was conducted at the company PT. Indo Riau Perkasa in Pekanbaru, Riau. The population in this study were all employees, totaling 65 people. Because the population size was relatively small, the entire population was sampled in this study using the census method. The results of the study explain that promotion has no and insignificant effect on employee performance, motivation has no and insignificant effect on employee performance, digital work experience has a and significant effect on employee performance, job satisfaction has a and significant effect on employee performance at PT Indo Riau Perkasa. Tujuan dalam penelitian untuk menganalisis hubungan promosi jabatan, motivasi, pengalaman kerja dan kepuasan kerja terhadap kinerja pegawai. Kebaruan penelitian ini menggunakan variabel pengalaman kerja digital sebagai variabel baru. Peneliti menambahkan indikator baru yakni kemampuan digital untuk memastikan bahwa variabel ini dapat digunakan di pengembangan penelitian masa depan. Penelitian ini dilakukan di perusahaan PT. Indo Riau Perkasa di Pekanbaru, Riau. Populasi dalam penelitian adalah seluruh karyawan yang berjumlah 65 orang, karena jumlah populasi relatif kecil maka keseluruhan populasi menjadi sampel dalam penelitian ini dengan menggunakan metode sensus. Hasil penelitian menjelaskan bahwa promosi jabatan tidak memiliki pengaruh dan tidak signifikan terhadap kinerja pegawai, motivasi tidak memiliki pengaruh dan tidak signifikan terhadap kinerja pegawai, pengalaman kerja digital memiliki pengaruh dan signifikan terhadap kinerja pegawai dan kepuasan kerja memiliki pengaruh dan signifikan terhadap kinerja pegawai pada PT. Indo Riau Perkasa.
ESG and Capital Structure: A Moderation Analysis of Firm Size Yenny Wati; Achmad Tavip Junaedi; Harry Patuan Panjaitan; Nyoto Nyoto; Astri Ayu Purwati
Jurnal Proaksi Vol. 12 No. 1 (2025): Januari - Maret 2025
Publisher : Fakultas Ekonomi dan Bisnis, Universitas Muhammadiyah Cirebon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32534/jpk.v12i1.6823

Abstract

Main Purpose - This study aims to determine the effect of ESG practices on a firm's capital structure, using firm size as a moderating variable.Method - This study utilizes moderated regression analysis conducted with Eviews. The research sample included businesses listed on the Indonesia Stock Exchange's IDXESGL index between 2020 and 2023.Main Findings - Companies with higher ESG scores typically have lower debt-to-asset and debt-to-equity ratios. Firm size can influence the relationship between ESG and capital structure. The relationship between ESG and capital structure has piqued the interest of investors and other stakeholders that can influence corporate decisions regarding debt and equity composition.Theory and Practical Implications - Companies increasingly recognize that sustainable business practices are not only ethically responsible but also financially profitable. Research can provide more precise policy suggestions to assist businesses in embracing strong ESG practices and enhancing their access to funding.Novelty - This study examines companies listed in Indonesia's ESG index, making the research findings more relevant to the local context, with firm size as a moderating variable.
Digitalisasi Bisnis Peternakan Kambing Syariah sebagai Upaya Pemberdayaan Masyarakat Hafni, Layla; Rahman, Sarli; Fadrul, Fadrul; Suharti, Suharti; Wijaya, Evelyn; Purwati, Astri Ayu; Octafilia, Yusnita; Safari, Surya; Junaedi, Achmad Tavip
JUDIKAT: Jurnal Pengabdian Kepada Masyarakat Vol 5 No 2 (2025): JUDIKAT: Jurnal Pengabdian Kepada Masyarakat
Publisher : Institut Bisnis dan Teknologi Pelita Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35145/judikat.v5i2.5736

Abstract

Peternakan kambing merupakan sektor agribisnis berbasis rakyat yang memiliki potensi besar dalam meningkatkan perekonomian masyarakat. Namun demikian, sebagian besar peternak masih menggunakan sistem pengelolaan tradisional yang berdampak pada rendahnya produktivitas, transparansi, dan akses pasar. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk memperkuat bisnis peternakan kambing melalui penerapan teknologi digital dan model bisnis berbasis syariah. Metode pelaksanaan meliputi seminar, pelatihan, dan diskusi interaktif yang melibatkan akademisi, peternak, dan pemangku kepentingan. Materi yang diberikan mencakup pencatatan digital, Business Model Canvas (BMC), pemanfaatan IoT dalam pemantauan ternak, serta skema pembiayaan syariah. Hasil kegiatan menunjukkan peningkatan pemahaman peserta terhadap pengelolaan peternakan modern, pemasaran digital, dan praktik bisnis yang etis sesuai prinsip Islam. Program ini berkontribusi dalam meningkatkan kapasitas manajerial peternak serta mendorong pengembangan agribisnis yang berkelanjutan dan berkeadilan.
Co-Authors Agung Suranto Agus Hocky Ahmad Rafa'i Alyauma Hajjah Amries Rusli Tanjung Amries Rusli Tanjung Amries Rusli Tanjung Andi Andi Andi Andi Andi Andi Anton Anton Anton Anton Aprilia, Bord Nandre Arih Dwi Prihastomo Asmara Hendra Komara Astri Ayu Purwati Astri Ayu Purwati Astuti Dara Anjeli Augustine, Yvonne Aulia Ramadhani Azridjal Aziz Bakhroini Benny Napitupulu Bord Nandre Aprila Cecilia Cecilia Cecilia Cecilia, Cecilia Chandra, Stefani Dadi Komardi David David Deby Tri Agustin Desnelita, Yenny Dhea Anggelina Djumilah Hadiwijoyo Dodi Sofyan Arief Eddy, Pujiono Eka Afnan Troena Emiliana Shania Meta Nahak Erlin Erlin Erpiani Siregar Evelyn Wijaya evelyn wijaya Evita Anugrah S Fadrul Fadrul Fadrul Fadrul Fadrul, Fadrul Fauzan Azim Fazal Mohamed Mohamed Sultan Fifi Puspita Fitri Yani Fitri Yani Fransisca, Luciana Fransiska Fransiska Geovanie, Geovanie Gusrio Tendra Gustientiedina Habibi Hairudin Hairudin Haristan, Meiviana Harry Patuan Panjaitan Helen Helen Herma Safitri Hocky, Agus Horsiando, Eric Hutahuruk, Marice Br Ida Ayu Putu Sri Widnyani Indri Yovita Intan Purnama Iwan Triyuwono Jahrizal Jaswar Koto Jennifer Chandra Jenny Angelica Jessen, Jessen Johan Johan Johan Johan Juniar Vina Komardi, Dadi Koto, Jaswar Kristy Veronica Kristy Veronica Kuswoyo Kuswoyo Layla Hafni Lindawati Sirait Luciana Fransisca Luciana Fransisca M Dalil Manullang, Megawati Marice Br Hutahuruk Marice Br Hutahuruk Marice Br Hutahuruk Marice Br Hutahuruk Marlim, Yulvia Nora Martha Ng Maydelyn Goh Mazzlida Mat Deli Megawati Pakpahan Michael Elian Davin Mimelientesa Irman Muhammad Adrian Agusta Muhammad Pringgo Prayetno Muhrodin, Muhrodin Mujtaba M. Momin Mujtaba M. Momin Mukhsin Mukhsin Musa, Sulaiman Nabila Hestia Nabila Wahid Nabila Wahid Napitupulu, Ryan Pardomuan Ngatno Nicholas Renaldo Nicholas Stanley Nicholas, Eric Novita Yulia Putri Novita Yulia Putri Nuriman M. Nur Nyoto Nyoto Nyoto, Nyoto Octafilia, Yusnita Octavellyn, Shierly Oka Atika Okalesa Okalesa Okalesa, Okalesa Olivia Dimaranty Onny Setyawan Onny Setyawan Onny Setywan Pamuji Hari Santoso Panggabean, Jessylane Prayetno, Muhammad Pringgo Prihastomo, Arih Dwi Priyono Priyono Purba, Jansaris Othniel Purnama, Intan Purwati, Astri Ayu Putri, Novita Yulia Rahma Widi Rahman, Sarli Ramadani, Yulita Ramadhani Ramadhani Ramdani Ramdani Rangga Rahmadian Yuliendi Rebecca La Volla Nyoto Rebecca La Volla Nyoto Ria Darmasari Ricky Wijaya Rizaldi Putra Rizqon Jamil Farhas Sabrina Sabnah Santhomas Pinso Santoso, Pamuji Hari Sarli Rahman Sarli Rahman Setiawan, Yayat Sevendy, Tandy Sofyanto, Sofyanto Sri Indrastuti Sri Indrastuti Stefani Chandra Sudarno Sudarno Sudarno Sugiyarti, Listya Suhardjo Suhardjo Suhardjo Suharti Suharti Suharti Suharti Suharti Sulaiman Musa Sulaiman Musa Sulaiman Musa Suranto, Agung Surya Safari SD Sutandijo, Sutandijo Suyono Suyono Suyono Teddy Chandra Teddy Chandra Tito Suprayoga Umar Faruq Umar Faruq Veronica, Kristy Vivi Wulansari Wahid, Nabila Wahyu Joni Kurniawan Wahyudi, Langgeng Wiariningsih, Oktaviani Wijaya, Boyke Wijaya, Evelyn Wijaya, Febriana Wendy Wilda Susanti Yarmanelis Yenni, Elfita Yenny Wati Yenny Wati Yuliana Yuliana Yusnidar Yusnidar Yusnidar Yusnidar Yusnita Octafilia Theresia A Yesu Infante Yusrizal Yusrizal Yvonne Augustine Zainol Mustafa