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All Journal MEDIA PETERNAKAN - Journal of Animal Science and Technology Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Industri Pertanian E-jurnal Agro-Industri Indonesia Jurnal Ilmu Komputer dan Informasi Reaktor Ekonomi Bisnis Jurnal Sains Dasar Syntax Jurnal Informatika TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics Jurnal Ilmu Komputer dan Agri-Informatika Journal of Telematics and Informatics Jurnal Penelitian Hasil Hutan Agrointek Perspektif : Review Penelitian Tanaman Industri JURNAL PASTI (PENELITIAN DAN APLIKASI SISTEM DAN TEKNIK INDUSTRI) Sinergi Jurnal Pangan dan Agroindustri Journal of Regional and City Planning Jurnal Riset Industri agriTECH Biota Planta Tropika Jurnal Teknologi dan Sistem Komputer JEPA (Jurnal Ekonomi Pertanian dan Agribisnis) Jurnal Teknologi & Industri Hasil Pertanian Krea-TIF: Jurnal Teknik Informatika International Journal of Supply Chain Management Menara Perkebunan ComTech: Computer, Mathematics and Engineering Applications Jurnal Bisnis dan Kewirausahaan Indonesian Journal of Electrical Engineering and Computer Science Jurnal Penelitian Hasil Hutan Perspektif, Review Penelitian Tanaman Industri Journal of Computer Science and Engineering (JCSE) Journal of Applied Data Sciences Agroradix : Jurnal Ilmu Pertanian Makara Journal of Technology Journal of Fibers and Polymer Composites Jurnal Teknologi Lingkungan Jurnal Sains dan Kesehatan Jurnal Bioteknologi & Biosains Indonesia (JBBI) Jurnal Penelitian Hasil Hutan International Journal of Oil Palm Jurnal Bioteknologi & Biosains Indonesia
Erliza Hambali
Departemen Teknologi Industri Pertanian, Fakultas Teknologi Pertanian, IPB University, Bogor, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Social Sciences Transportation

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Pickering Emulsion Properties Generated by Nanofibrillated Cellulose Isolated from Oil Palm Fruit Bunch (OPEFB) as a Stabilizer Ira Desri Rahmi; Erliza Hambali; Farah Fahma; Dwi Setyaningsih
Journal of Fibers and Polymer Composites Vol. 2 No. 2 (2023): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v2i2.98

Abstract

This study aims to find the optimal nanofibrillated cellulose (NFC) concentration isolated from oil palm empty fruit bunch (OPEFB) particles to form stable pickering emulsions against creaming and coalescence. The emulsification process is based on a combination of homogenizer and ultrasonication. Pickering emulsion was prepared by mixing the dispersed phase (palm oil) and the dispersing phase (NFC concentration of 0.05 - 0.7 w/v%) at the ratio of 10:90. Fresh emulsion has a milky white appearance and is homogeneous. However, some samples' creaming process occurred on the 30th day of storage. Microscopic observations show that the droplets are round with various sizes. Differences in NFC concentrations significantly affect droplet size, zeta potential, rheology, and emulsion stability. Increasing the NCF concentration resulted in smaller droplet sizes, viscosity, zeta potential, and pickering emulsion stability. The emulsion has high stability against coalescence and creaming. NFC at 0.7 w/v% generates an emulsion with the best characteristics and high stability against creaming and coalescence. OPEFB-based NFC has the potential as a pickering emulsion stabilizer particle that can be applied to the food and non-food industries.
Various Methods of Reducing Calcium Oxalate Levels in Tubers: a Review Ati Atul Quddus; Erliza Hambali; Mulyorini Rahayuningsih; Ika Amalia Kartika; Slamet Budijanto
Biota Vol 10 No 1 (2024): Jurnal Biota 2024
Publisher : Faculty of Science and Technology Universitas Islam Negeri Raden Fatah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/Biota.v10i1.20473

Abstract

Tubers, as a highly promising agricultural commodity with distinctive flavors and nutritional content, pose health challenges due to the presence of calcium oxalate. Excessive consumption can lead to mechanical disturbances in the digestive and renal tubule systems. This complicates processing techniques to ensure that tubers, before being used as raw materials in the food and other industries, do not contain calcium oxalate. The research method involves a literature review, in-depth exploration of theories and concepts, and identification of variables related to the research method and context. From the literature study, it is evident that focusing on understanding fermentation parameters, such as time, temperature, pH, and the type and concentration of microorganisms, is crucial. This information is expected to provide insights into potentially effective methods for reducing calcium oxalate content in tubers, supporting the development of safer and healthier agricultural and food processing practices.
KARAKTERISTIK SUKROSA ESTER DARI METIL MIRISTAT MENGGUNAKAN KATALIS K2CO3 dan Na2CO3 Rahmadanis Rahmadanis; Erliza Hambali; Obie Farobie
Jurnal Teknologi Industri Pertanian Vol. 33 No. 2 (2023): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24961/j.tek.ind.pert.2023.33.2.188

Abstract

Sucrose ester is a renewable raw material that is environmentally friendly, non-toxic, biocompatible, and biodegradable with emulsification, stabilizing, and conditioning characteristics, so it is widely used in emulsion product applications. This study aims to characteristics the sucrose ester from methyl Myristic using K2CO3 and Na2CO3 as catalysts. The synthesis of sucrose ester uses methyl Myristic, which is a renewable raw material. Synthesis of methyl myristic was carried out by the esterification method, the synthesis of sucrose ester was carried out by the transesterification method with free solvent, the catalyst used was alkaline K2CO3 and Na2CO3 (6%), the reaction was carried out at 60°C for 30 minutes then 110°C for 90 minutes. The analyzes carried out were FTIR, HPLC, pH, foam stability, emulsion stability, surface tension, interfacial tension, contact angle, particle size, and polydispersity index. The results showed the characteristics of sucrose ester using K2CO3 were better than Na2CO3. The resulting characteristics are the sucrose ester group present at a wave number of 1726 nm, sucrose ester content 96,87%; the pH 10.73, foam stability 88,06%, the emulsion stability 63,68%, the surface tension 29.64 cm/dyne, interfacial tension 2,96 cm/dyne, contact angle 36,85°, particle sizes in the range of 2,35-9,74 µm, and a polydispersity index value 0.412. The resulting sucrose myristate can be applied to the cleaning, personal care, and cosmetic industries Keywords: catalysts, methyl myristic, sucrose ester
Sintesis keton dari asam lemak stearat dengan katalis layered double hydroxide (LDH) Mg-Al-Cu Firman Arief Soejana; Erliza Hambali; Obie Farobie
AGROINTEK Vol 18, No 2 (2024)
Publisher : Agroindustrial Technology, University of Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/agrointek.v18i2.17108

Abstract

The synthesis of ketones from stearic fatty acids using the fatty acid decarboxylation method to ketones has been carried out to increase the added value of palm oil derivative products. One of the derivative products of palm oil is Crude Palm Oil which can be converted into fatty acids through the triglyceride hydrolysis process. Palm fatty acids are Indonesia's most potentially environmentally friendly raw material. This research aims to synthesize ketones from palm fatty acids using a catalyst. Ketone compounds were synthesized using a solid base catalyst as a double hydroxide layer based on Mg-Al-Cu. Identification of the presence of a C=O ketone group was carried out by testing the Fehling test, Tollens, spectrophotometer (FTIR), and computing the yield. The results showed the success of ketone synthesis using the fatty acid decarboxylation method into ketones through a test of Fehling's on stearic fatty acid ketone products. Meanwhile, in the Tollens test, there wasn't a change in the silver mirror. Furthermore, the spectrophotometer test (FTIR) showed the presence of a C=O bond or a carbonyl group at the peak wave 1707 cm-1. Ketone's synthesis produced was 95.09%.
Spatial Skyline Query Based on Surrounding Environment Untuk Data Streaming Menggunakan Apache-Spark Firzatullah, Raden Muhamad; Djatna, Taufik; Annisa, Annisa; Andrianingsih, Andrianingsih
Jurnal Teknologi dan Sistem Komputer Volume 10, Issue 2, Year 2022 (April 2022)
Publisher : Department of Computer Engineering, Engineering Faculty, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jtsiskom.2022.14268

Abstract

Previous research on Spatial Skyline Query Based on Surrounding Environment left a challenge in finding skyline objects that support the use of mobile devices. This study introduces a method that allows users to search for spatial objects dynamically. Cloud-based streaming data services are currently available to support the dynamic search of spatial skyline objects. Under these conditions, streaming data requires a longer processing time. This study aims to examine the effectiveness and efficiency of Apache-Spark in developing Spatial Skyline Query Based on Surrounding Environment in processing streaming data. Further implementation of the developed algorithm can provide better location access for users on mobile devices. Comparative analysis of algorithm execution time is performed by comparing algorithm processing on a single processor and cluster computing using various evaluation parameters. The test results on each parameter show that the computation time of the proposed algorithm on a single computation is not as good as the previous algorithm. However, in cluster computing, the proposed algorithm is superior
SCOR-Based Information Modeling for Managing Supply Chain Performance of Palm Oil Industry at Riau and Jambi Provinces, Indonesia Djatna, Taufik; Marimin, Marimin; Massijaya, Muh. Yusram; Asrol, Muhammad; Baidowi, Taufiq; Harison, Harison; Safriyana, Safriyana; Martini, Sri
International Journal of Supply Chain Management Vol 9, No 5 (2020): International Journal of Supply Chain Management (IJSCM)
Publisher : ExcelingTech

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59160/ijscm.v9i5.4043

Abstract

Abstract— The challenges for providing a concise performance reports along all components in Palm Oil agro-industry supply chain are urgent particularly in terms of managing each metrics of the stakeholders. This SCOR (Supply Chain Operation Reference)-based information model attempts to represent real requirements of each stakeholder. Initially, all relevance stakeholders are identified through field observation and interviews. Each SCOR model attribute, i.e. agility, assets, cost, reliability and responsiveness are mapped into respectfully definition in the field of Palm Oil agro-industry. The related attribute is derived into metrics of evaluation for measuring specific performance according to the formulation. In order to report a definitive performance measurement in each attribute, benchmarking from best practice is taken. This model functionality is evaluated by using real world data derived from two major provinces of Palm Oil agro-industry in Indonesia, namely Jambi and Riau provinces. Object relational database is generated and stationed in a cloud-based server. A framework of business process modeling and notation integrates these required processes of the model with the cloud-based database access. The integration of JavaScript (Bonita soft) based front-end with the SCOR-based database operation is ready for mobile and desktop usage. A series of visualization is provided to support fast understanding in each performance measurement, such us spider chart, histogram and line chart as well as ETL (extract, transform, load) features. A full comparison based on geographical location is ready for inquiry for each user level (farmer, trader and palm oil mill).Keywords—Agro-industry, Information, Palm Oil, Performance, SCOR
Identifikasi Senyawa Aktif Ekstrak Daun Pulutan (Urena lobata L) dengan GC-MS: Identification of Active Compound in Pulutan (Urena lobata L) Leaf extract using GC-MS Ummu Farah Fadillah; Erliza Hambali; Muslich Muslich
Jurnal Sains dan Kesehatan Vol. 2 No. 3 (2020): J. Sains Kes.
Publisher : Fakultas Farmasi, Universitas Mulawarman, Samarinda, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25026/jsk.v2i3.155

Abstract

Pulutan leaf (Urena lobata Linn) is a type of plant that has long been used by the community as a remedy for various diseases. This research was conducted to determine the components of active compounds contained in the ethanol extract of pulutan leaves using GC-MS. The identification results showed that 50% ethanol extract of the pulutan leaves contained 5 compounds dominated by carbonic acid,monoamide,N-(2-ethylphenyl)-,propyl ester, Stigmasta-3,5-diene, and n-Hexadecanoic acid. Whereas 70% ethanol extract contained 18 compounds dominated by 4h-pyran-4-one, 2,3-dihydro-3,5-dihydroxy-6-methyl-, 2-methoxy-4-vinylphenol, phenol, 2,6- dimethoxy-, and n-hexadecanoic acid.
Evaluasi Produksi Refuse-Derived Fuel (RDF) dari Sampah Perkotaan (Studi Kasus: RDF Plant di Kabupaten Cilacap) Maulidayanti, Esti Mega; Yuliani, Manis; Robbani, Muhammad Haqqiyuddin; Wiharja, Wiharja; Hambali, Erliza; Setyaningsih, Dwi
Jurnal Teknologi Lingkungan Vol. 25 No. 2 (2024)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2024.1008

Abstract

Indonesia’s prevailing waste management paradigm, which still employs a collect-transport-dispose system, results in waste accumulation and adverse effects on health and the environment. In contrast, the cement sector’s necessity for renewable and environmentally benign energy is increasing. Refused-derived fuel (RDF) technology is one of the potential ways to solve both concerns. This study aimed to assess the viability of RDF manufacturing processes and products for the cement industry and to offer recommendations for a national standard. This research procedure included identifying waste composition and characteristics, observing RDF production, and evaluating RDF product quality, such as testing water content, ash content, and heating value. The results demonstrated that the Cilacap RDF Plant successfully produced RDF from municipal solid waste using the mechanical-biological treatment (MBT) method. The biodrying process could reduce waste’s moisture content from 55.44% to 23.63% and increase the heating value to approximately 15 MJ/kg. Nevertheless, the quality of RDF products must be enhanced to align with the biomass standards for the industry (SNI 8675: 2018). The Cilacap Plant RDF products were feasible for application in the cement industry, with further product quality improvement and production process optimization. The findings could be a reference for developing national standards in manufacturing RDF as an alternative fuel in the cement industry.   Abstrak Pengelolaan sampah di Indonesia masih menggunakan sistem kumpul-angkut-buang, menyebabkan penumpukan sampah dan dampak negatif terhadap kesehatan dan lingkungan. Di sisi lain, kebutuhan energi terbarukan dan ramah lingkungan di sektor industri semen terus meningkat. Teknologi bahan bakar jumputan padat atau refuse-derived fuel (RDF) dianggap mampu menyelesaikan kedua permasalahan tersebut. Penelitian ini bertujuan untuk mengevaluasi kelayakan proses pembuatan dan produk RDF untuk industri semen serta memberikan rekomendasi untuk pembuatan standar nasional. Prosedur penelitian ini mencakup identifikasi komposisi dan karakteristik sampah, observasi tahapan proses produksi RDF, dan evaluasi kualitas produk RDF seperti kadar air, kadar abu, dan nilai kalor. Hasil penelitian menunjukkan bahwa RDF Plant Cilacap berhasil memproduksi RDF dari sampah kota menggunakan metode mechanical-biological treatment (MBT). Proses biodrying mampu menurunkan kadar air sampah dari 55,44% menjadi 23,63% dan meningkatkan nilai kalor menjadi sekitar 15 MJ/kg. Namun, kualitas produk RDF masih perlu ditingkatkan untuk memenuhi standar biomassa untuk industri (SNI 8675:2018). Produk RDF Plant Cilacap dinilai cukup layak untuk industri semen, dengan beberapa rekomendasi untuk peningkatan kualitas produk dan optimalisasi proses produksi. Temuan ini diharapkan dapat menjadi rujukan dalam pembuatan standar nasional dalam produksi RDF sebagai bahan bakar alternatif di industri semen.
Development of Skyline Query Algorithm for Individual Preference Recommendation in Streaming Data Amin, Ruhul; Djatna, Taufik; Annisa, Annisa; Sitanggang, Sukaesih
Journal of Applied Data Sciences Vol 6, No 2: MAY 2025
Publisher : Bright Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/jads.v6i2.599

Abstract

The ability of a recommendation system to deliver relevant outcomes is significantly influenced by its adaptability to the dynamic nature of individual user preferences. Data-streaming-based recommendation systems face substantial challenges in aligning recommendations with rapid shifts in user preferences. Previous research on the development of skyline query algorithms has predominantly focused on processing efficiency and parallel performance optimization yet has not addressed the dynamic nature of individual user preferences—an essential factor for generating relevant and responsive recommendations in streaming data environments. This study aims to develop a skyline query algorithm called Distributed Data Skyline (DDSky) to provide recommendations based on dynamic individual user preferences within data-streaming contexts. DDSky leverages the Recency, Frequency, Monetary, and Rating (RFMRT) model to capture real-time changes in user preferences. This model is integrated with parallel skyline computation and structured to enhance the data processing efficiency on a large scale. The parallel processing approach divides tasks into smaller subtasks executed simultaneously across multiple threads. This strategy enables the simultaneous processing of attributes such as price, distance, and individual user preferences, thereby delivering relevant and responsive recommendations to real-time changes in user preferences. The DDSky algorithm was evaluated using a local dataset from the JALITA application and compared with the Eager algorithm. The results demonstrated that DDSky outperformed Eager, achieving an average recall value of 0.45 and an F1-measure of 0.55, compared to Eager's recall value of 0.33 and F1-measure of 0.47. Furthermore, DDSky achieved an average precision of 0.73, which closely approached Eager's precision of 0.82. Additionally, DDSky exhibited optimal throughput performance for datasets containing up to 10,000 items with high flexibility across various data types. With its unique technical approach, DDSky delivers more responsive and relevant recommendations to dynamic user preferences, establishing its superiority in data-streaming-based recommendation systems.
Optimizing Transportation Routes and Costs in Crude Palm Oil Supply Chains using Linear Programming: A Case Study of PT.X, OKU Regency, South Sumatera Pramestari, Diah; Djatna, Taufik
Journal of Computer Science and Engineering (JCSE) Vol 6, No 1: February (2025)
Publisher : ICSE (Institute of Computer Sciences and Engineering)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Transportation is a crucial factor that significantly impacts the supply chain. Because there aren't enough roads and other ways to get around, it's hard for one of the companies in OKU Regency that makes crude palm oil to get its products to customers, especially when it rains. The company that produces cooking oil received a delivery of crude palm oil, accounting for 90% of total production, from PT.X. The delivery of crude palm oil to PT.Y was received later than the original schedule. Number formulas that are meant to solve PT.X transportation problems can be written in terms of linear programming methods. From the stages of collecting, processing data and testing formulations using the LINDO application, it was discovered that under ideal conditions there are 9 alternative transportation routes from origin city B to destination city TJ with the shortest time of 9 hours. The delivery of transportation mode uses 12 tanks with 9.5 tons capacity and 17 tanks with 8 tons capacity and the lowest transportation expenses are Rp. 487.580. The results of the general mathematical formulation can then be used to solve transportation problems for other cases with similar conditions to PT.X. This mathematical formulation can be used for making decisions in selecting transportation routes, selecting modes and transportation costs. Changes in production factors such as capacity, number of orders, travel time, delivery distance, fuel prices, and toll rates can change the decisions made by entering their actual values in the general mathematical formula that has been produced.
Co-Authors , Sutrisno . Ismiyati . Machfud . MUSLICH . Sucipto A M Fauzi Ade Febransyah Agus Buono Amun Amri Anas Miftah Fauzi Andrianingsih Ani Suryani Ani Suryani Ani Suryani Ani Suryani Ani Suryani Ani Suryani Annisa Annisa Annisa Arif Rakhman Hakim Armansyah H. Tambunan Arum Nur Fitrah Arum Nur Fitrah, Arum Nur Asrol, Muhammad Astried Silvanie Ati Atul Quddus Aulia, Zesma Bagas Ari Wicaksono Baidowi, Taufiq Bambang Hero Saharjo Borneo Satria Pratama Budi Arif Dermawan Dadan Kusdiana Dadang Rukmana Darmono Taniwiryono Darmono Taniwiryono Delfitriani Devy Setyana Ditdit N Utama Djumali Mangunwidjaya Dwi Febriantini Dwi Febriantini, Dwi Dwi Setyaningsih Dwi Setyaningsing Edi Zulchaidir Eka Kurnia, Eka Elisa Anggraeni, Elisa Erliza Noor Erni Krisnaningsih Fadhil, Rahmat Fadilla Eka Aulyana FARAH FAHMA Fariz Pari, Rizfi Fatria Resti Haryani Firda Dimawarnita Firda DIMAWARNITA Firda Dimawarnita Firman Ardiansyah Firman Arief Soejana Firzatullah, Raden Muhamad Fitriani Kasim Fitriani Kasim Galih Kurniawan Sidik Galih Kurniawan Sidik Ghiffari, Muhammad Amirul Ghiffari, Muhammad Amirul Gustan Pari Gustan Pari Gustan Pari Habyba, Anik Nur Harahap, Serarifi Elagin Heru Sukoco Ika Agustin Rusdiana Ika Agustin Rusdiana Ika Amalia Kartika Illah Sailah Imas Sukaesih Sitanggang Ina Siti Hasanah Indah Yuliasih Irawan, Andre Irman Hermadi Irzaman, Irzaman Is Sulistyati Jupikely James Silip Kadarwan Soewardi Kartika Okta Purnama Kartika Okta Purnama Khaswar Syamsu Kunaifi Kunaifi M Luqmanul Hakim M. Iwan Fermi M. Syamsul Maarif Machfud Machfud Marimin , Marimin Marimin Maulidayanti, Esti Mega Ma’ruf Pambudi Nurwantara Memen Surahman Miftah Fauzi , Anas Mira Rival Moh. Yani Muh. Yusram Massijaya Muhammad Arif Kamal Mukarramah Lubis Mulyorini Rahayuningsih Muslich . Muslich Muslich, Muslich Naoto Matsue Nasution, Rahmat Wahyudi Nasution, Rahmat Wahyudi Neny Rosmawarni Ni Nyoman Indah Adi Puspita Nurmiati Nurmiati Nurmiati Nurmiati Obie Farobie Paduloh Paduloh Pebriani, Siska Petir Papilo Petir Papilo Pradana, I Gusti Made Teddy Pramestari, Diah Prasetyo Nugroho, Eddy Purnama, Kartika Okta Purwo Subekti Rahmadanis Rahmadanis Rahmadini Payla Juarsa Rina Novia Yanti Riztiara Nurfitri Robbani, Muhammad Haqqiyuddin Rosa, Mutya Ruhul Amin Rusdiana, Ika Agustin Safriyana, Safriyana Sapta Raharja Setyaningsing, Dwi Shafira Nurfadhila Sidik, Galih Kurniawan Simatupang, Yeni Veronika Siska Desri Wirahmi, Busman, Edrizal, Siska Pebriani Sitanggang, Sukaesih Siti Mujdalipah Siti Wardah, Siti Slamet Budijanto Soejana, Firman Arief Sri Martini Sukardi Sukardi Sukardi Sukardi Syarifuddin Nasution, Syarifuddin Taniwiryono, Darmono Taufik Djatna Teniwut, Wellem Anselmus Tri Panji Tun Tedja I Tun Tedja Irawadi Ummu Farah Fadillah Utomo, Prayudi Utomo, Prayudi Utomo Wiharja Wiharja Wisudawaty, Priska Yandra Arkeman Yani Nurhadryani Yora FARAMITHA Yora Faramitha Yuliani, Manis Z Zulfansyah