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All Journal Jurnal Gizi dan Pangan Jurnal Energi Dan Manufaktur Jurna lAntropologi Indonesia Agrikultura Proceedings of Annual International Conference Syiah Kuala University - Life Sciences & Engineering Chapter Jurnal Dinamis Jurnal Ilmiah Aplikasi Isotop Radiasi Jurnal Simetris JUPIIS: Jurnal Pendidikan Ilmu-ilmu Sosial Agrointek Jurnal Ilmiah MITSU (Media Informasi Teknik Sipil Universitas Wiraraja) Media Trend: Berkala Kajian Ekonomi dan Studi Pembangunan Jurnal Teknik Sipil EMITTER International Journal of Engineering Technology BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Studi Al-Qur'an Jurnal Analisa Sosiologi The Spirit of Society Journal : International Journal of Society Development and Engagement JURNAL AGRICA JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) Jurnal Mantik PERSPEKTIF Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Jurnal Ilmiah Teknik Mesin "MEKANIK" Jurnal Teknika INFOKUM Jurnal Penelitian Manajemen Terapan (Penataran) AGRISAINS: Jurnal Ilmiah Magister Agribisnis Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Jurnal Teknologi Sistem Informasi dan Sistem Komputer TGD Jurnal Pengabdian kepada Masyarakat Jurnal SAINTIKOM (Jurnal Sains Manajemen Informatika dan Komputer) Proceeding International Seminar of Islamic Studies TARBAWY: Indonesian Journal of Islamic Education Jurnal Pengabdian Masyarakat IPTEK Dinamis Jurnal Sistem Komputer Triguna Dharma (JURSIK TGD) Jurnal Sistem Informasi Triguna Dharma (JURSI TGD) Jurnal Prointegrita Jurnal Karya Abdi Masyarakat IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Teknologi dan Industri Pertanian Indonesia Jurnal Riset Multidisiplin dan Inovasi Teknologi Rona Teknik Pertanian International Journal of Economics and Business (IJEB)

Zulkifli Lubis

Program Studi Ilmu Dan Teknologi Pangan Fakutas Pertanian USU Universitas Sumatera Utara

Author-ID : 309200

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Karakteristik Kimia Biskuit dari Tepung dan Serat Ubi Jalar Ungu Stefani Limanto; Elisa Julianti; Zulkifli Lubis
Jurnal Teknologi dan Industri Pertanian Indonesia Vol 11, No 2 (2019): Vol. (11) No. 2, Oktober 2019
Publisher : Agricultural Faculty

Purple sweet potato is one type of tuber that is rich in carbohydrates in the form of starch and fiber. It also contains purple anthocyanin pigments. In this research, purple sweet potato was processed into flour and starch. Starch processing solid waste can be utilized by processing it into fiber flour. Purple sweet potato flour and fiber were then used as the basis for making biscuits at a ratio of 75: 25 and compared to biscuits made from 100% purple sweet potato flour and wheat flour. The resulting biscuits were then analyzed for their chemical characteristics. The results showed that the ratio of flour gave a very significantly different effect on the value of water content, total dietary fiber content, insoluble dietary fiber content and % nutritional adequacy rate of food fiber, and had no significant effect on the value of ash content, protein content, fat content, content carbohydrates, total flavonoids, insoluble dietary fiber content, calorie intake and fulfillment of daily energy adequacy.

Gamma Tomography as The Complementary Technique for Pipe Scale Investigation: Field Experiment at Petrochemical Plant Bayu Azmi; Indra Milyardi; Megy Stefanus; Wibisono Wibisono; Fery Hadi Setiawan; Norman Pamungkas; Zulkifli Lubis
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 19, No 1 (2023): Vol 19, No. 1 (2023): November 2023
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2023.19.1.6929

Crack gas flowing from furnace to gasoline fraction tower through BA-106 pipeline. The pipeline has not been inspected for 30 years of operation and it is suspected that there is pipe scale in it. The scaling reduces the inner diameter of the pipe which disrupt the pipeline flow rate that might cause a fatal accident. The scale particles also became impurities in the subsequent process. The information on scale conditions inside the pipeline is needed to determine further action to ensure safety and maintain the productivity of the plant. The gamma scanning technique was conducted at 18 points to diagnose the scaling profile inside the pipe. A collimated 2.96 GBq 137Cs radiation source emits a pencil beam of gamma photons to penetrate the pipe. A NaI(Tl) scintillation detector was placed opposite the gamma source to detect the photons. They were moving in parallel vertically and horizontally for every 10 mm step to get the attenuation profile of the pipe. Furthermore, a tomography scan was performed at selected points with 32 projections data. So far previous experiments were performed in the laboratory and the objects were smaller (less than 500 mm), however, the current experiment was performed in real industrial plants and the object diameter was about 1500 mm. The reconstructed image has been successful in showing the cross-sectional of the pipe that consists of scale inside it. The image was analyzed to get the percentage of the remaining fluid area due to scaling. The remaining fluid area was 56.15% of normal pipe without scale. It was proved that the gamma tomography technique is suitable for pipe scale measurement to get the cross-section visualization of the pipe.

An Analysis of Loss Cost due to Road Clock on the Road Construction (Rigid Pavement) Reviewed by the Use of Oil Fuel Nh, Ah. Syarifuddin; Lubis, Zulkifli
THE SPIRIT OF SOCIETY JOURNAL : International Journal of Society Development and Engagement Vol 7 No 1: September 2023
Publisher : LPPM of NAROTAMA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29138/scj.v7i1.2547

This research was conducted against the background of road improvements on the road section in Ambeng-Ambeng Watangrejo village, Duduksampeyan, Gresik Regency along ± 1.5 km which caused traffic jams due to narrowing of road capacity. Vehicle travel time is very influential on the level of fuel consumption, because the longer the travel time experienced by a vehicle, the more fuel consumption will be. The length of congestion will affect the temperature of the vehicle engine which will get hotter which will eventually affect fuel consumption which will be more wasteful and this will result in a considerable material loss value. This study used quantitative research methods and direct surveys. The primary data used in this study included vehicle travel time and vehicle volume. The types of vehicles analyzed are several types of cars fueled by pertalite. Then the data is processed using references from the Indonesian Road Capacity Guidelines (PKJI 2014) and LAPI-ITB. The results showed that the loss of private cars (KR) fueled by the pertalite type was quite large, namely on Monday, the total loss during the 6 hours of research amounted to Rp.13.575.702 with an average hourly loss of Rp.2.262.617. As for Tuesday, the total loss during the 6 hours of research amounted to Rp.15.942.725 with an average hourly loss of Rp.2.657.121. And for Wednesday, the total loss during the 6 hours of research amounted to Rp.12.182.256 with an average hourly loss of Rp.2.030.376

Cost Analysis of Road Congestion Losses on Road Construction (Rigid Pavement) Judging from the Travel Delay Time Hamdi, Misbakhul; Lubis, Zulkifli
THE SPIRIT OF SOCIETY JOURNAL : International Journal of Society Development and Engagement Vol 7 No 1: September 2023
Publisher : LPPM of NAROTAMA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29138/scj.v7i1.2548

Along the duduksampeyan highway there is road construction (rigid pavement) so that the road section has narrowed, which originally had 4 two-way lanes reduced to 2 two-way lanes along 1.5 km so that traffic became paralyzed and caused long queues of vehicles. This results in a significant delay that can harm transportation users who cross the road. The purpose of this study was to determine the length of queues and travel delay times. Then the data that has been obtained from the field is then analyzed based on technical aspects based on the Indonesian road capacity guidelines in 2014 (PKJI, 2014). From the analysis of the queue length above, the longest queue with a length of 2481.3 meters from the direction of Lamongan - Surabaya and the shortest queue with a length of 1187.1 meters in the direction of Lamongan - Surabaya. The results of the delay time analysis found that the highest delay time occurred on Monday at 07:00 – 08:00 with a delay time of 26,26 minutes from the direction of Lamongan - Surabaya and on Wednesday at 08:00 – 09:00 was the lowest delay time with a delay time of 0,1 minutes from the direction of Lamongan - Surabaya.

Proses Pembuatan Mesin Pengiris Buah Pinang Model Pisau Rotari Kapasitas 25 Kg/Jam Irfansyah, M.; Lubis, Zulkifli; Oppusunggu, Kamrul; Nurdiana, Nurdiana
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 1 No 2 (2022): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v1i2.12

Areca fruit slicing machine, with a capacity of 25 kg/hour, has a machine construction consisting of a drive mechanism, an inlet mechanism, an outlet mechanism and a slicing mechanism. The areca fruit slicing mechanism uses the main components such as the pressure handle, inlet, disc carrying the blade, and the slicing knife. At the same time, the drive mechanism uses supporting components such as intermediate shafts, reducers, gears, pulleys and belts. The manufacture of this machine uses machine tools, including lathes, grinding machines, cutting grinding machines, drill/drilling machines, milling machines and welding machines. At the same time, the components made include the machine frame, drive shaft, pressure handle, slicing blade, disc carrying blade, inlet, outlet, and casing cover. Time calculation can be done by planning the work steps of the manufacturing process for each component, including the procurement of materials, measurements, processes, time intervals (wasted time) and finishing. From the work results, it was obtained that the total time for making eight components and assembling was 1094.48 minutes (18.24 hours).

Governmentality Practices in Community Empowerment: One Step to Create Economic Income and Social Protection in Pematang Johar Village, Deli Serdang Regency Mujahiddin, Mujahiddin; Badaruddin, Badaruddin; Lubis, Zulkifli; Daulay, Harmona
Jurnal Riset Multidisiplin dan Inovasi Teknologi Том 2 № 03 (2024): Jurnal Riset Multidisiplin dan Inovasi Teknologi
Publisher : PT. Riset Press International

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59653/jimat.v2i03.1095

Linking governmentality practices to community empowerment programs in rural areas is based on the Indonesian government's claim that the success of development in villages is due to the involvement of the central government in directing development planning in villages through the various technical regulations they issue. Village governments are only given space for elaboration and accommodation of regulations made by the central government based on local values, local potential, needs and interests of village communities. The existence of this space for elaboration and accommodation makes the practice of governmentality applicable in rural areas, namely giving freedom and authority to villages but at the same time directing them with various possible choices that are actually desired by the state. This article finds the operation of governmentality practices in the discourse of increasing economic welfare rationalized by the Pematang Johar Village Government for the community through the development of rice field tourism objects in their village. This discourse is able to change the village community's perception of the goals of village development, which until now have only been understood in terms of infrastructure development. Through this discourse, the village government is able to form empowered people; namely village people who are continuously trained in skills, corrected and disciplined. The self-adaptation that they carry out is of course aimed at increasing their capacity and quality from the status of the tasks they carry out daily in the rice field tourism which leads them to become economically prosperous.

KOMUNIKASI ANTAR BUDAYA DALAM PENINGKATAN HUBUNGAN HARMONIS ANTAR KARYAWAN DI SEKOLAH PRIMEONE SCHOOL KOTA MEDAN Butar Butar, Dewi Sartika; Piolina, Piolina; Dalimunthe, Syukur Kholil; Lubis, Zulkifli
JURNAL PROINTEGRITA Vol 5 No 1 (2020): APRIL
Publisher : LPPM Universitas Darma Agung

This study aims at finding out the pattern of intercultural communication that occurs in a prime one school environment; the social and cultural values in enhancing harmonious relations within the PrimeOne School Medan employees and the factors that support and hinder employees in communicating at school. This research was conducted at the private school PrimeOne School in Medan. The research informants were determined by purposive sampling and Snowball Sampling based on certain criteria. This type of research is a descriptive study using a qualitative approach. Primary data were obtained through direct observation and in-depth interviews with informants. Meanwhile, secondary data obtained from data collection through documents in the form of books, journals, the internet, and photos related to the research topic. The data collected was then analyzed using the Miles and Huberman Interactive Analysis Model. The results of this study indicate that initially cultural differences, especially language, became a challenge both for foreign students and local students in communicating so that cross-cultural communication patterns that occur between foreign employees and local employees as well as interactions with students in communicating at school are very tortuous and experience difficulty. But over time, the interaction of the two gradually improved. In addition, social needs as humans to interact and communicate become supporting factors that encourage both to always be involved in conversation.

ANALISIS MOTIVASI, LINGKUNGAN KERJA, KOMPETENSI, DAN KOMPENSASI TERHADAP KINERJA DIMEDIASI KEPUASAN KERJA KARYAWAN PADA UMKM UD. NOER BERKAH ABADI (METODE PARTIAL LEAST SQUARE (PLS) - STRUKTURAL EQUATION MODELING (SEM)) Muhtarom, Abid; Syafik, Muhammad; Pratiwi, Neny; Badriyah, Nurul; Lubis, Zulkifli
Jurnal Penelitian Manajemen Terapan (PENATARAN) Vol. 8 No. 1 (2023)
Publisher : Program Studi Manajemen STIE Kesuma Negara Blitar

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

Tujuan penelitian ini adalah untuk mengidentifikasi variabel-variabel yang memiliki pengaruh positif paling signifikan antara motivasi, lingkungan kerja, kompetensi, dan kompensasi terhadap kinerja karyawan dalam memediasi kepuasan kerja, baik secara parsial maupun simultan UD. Noer. Berkah Abadi. Sebanyak 115 karyawan diikutsertakan dalam penelitian ini, serta sampel sebanyak 115 karyawan. Analisis statistik deskriptif digunakan untuk menganalisis data. Dengan variabel Motivasi (X1), lingkungan kerja (X2), Kompetensi (X3), dan Kompensasi (X4) memiliki pengaruh yang signifikan terhadap Kinerja Karyawan (Y) di mediasi kepuasan kerja (Z) pada UD. Noer Berkah Abadi. Kata Kunci: Kepuasan kerja, Kinerja karyawan, Kompensasi, Kompetensi, Lingkungan kerja, Motivasi, SEM-PLS

PENGARUH KARAKTERISTIK WIRAUSAHA, MODAL USAHA, KEMAMPUAN USAHA, DAN STRATEGI PEMASARAN TERHADAP KEBERHASILAN USAHA DENGAN PERKEMBANGAN USAHA SEBAGAI VARIABEL INTERVENING (STUDI KASUS PADA KEDIREN KECAMATAN KALITENGAH KABUPATEN LAMONGAN) Muhtarom, Abid; Munaffidah, Erlindiyanti Saidatul; Ruswaji; Badriyah, Nurul; Lubis, Zulkifli
Jurnal Penelitian Manajemen Terapan (PENATARAN) Vol. 8 No. 2 (2023)
Publisher : Program Studi Manajemen STIE Kesuma Negara Blitar

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

Abstrak Pengembangan Usaha Mikro Kecil dan Menengah dalam ekonomi merupakan masalah penting yang perlu dikembangkan dan ditingkatkan terus menerus. Karena peran UMKM sangat penting, maka dilihat dari jumlah tenaga kerja yang terserap dapat mengurangi tingkat pengangguran. Jenis penelitian ini adalah kuantitatif dengan jumlah sampel 200 dan metode analisis yang digunakan adalah SEM menggunakan alat Smart-PLS versi 3.0. berdasarkan hasil penelitian bahwa karakteristik wirausaha dan modal usaha terhadap keberhasilan usaha terdapat pengaruh positif secara signifikan. Strategi pemasaran terhadap keberhasilan usaha berpengaruh postif dan signifikan, dan kemampuan usaha terhadap keberhasilan usaha terdapat pengaruh negatif secara signifikan. Dari uji mediasi menunjukkan karakteristik wirausaha terhadap keberhasilan usaha dimediasi perkembangan usaha dikatakan Non Mediation. Modal usaha terhadap keberhasilan usaha dimediasi perkembangan usaha dikatakan Partial Mediation.kemampuan usaha terhadap keberhasilan usaha dimediasi perkembangan usaha dikatakan Full Mediation. Strategi pemasaran terhadap keberhasilan usaha dimediasi perkembangan usaha dikatakan Partial Mediation. Kata kunci: karakteristik wirausaha, modal usaha, kemampuan usaha, strategi pemasaran, keberhasilan usaha dan perkembangan usaha, SEM-PLS

TRADITIONAL INSTITUTIONS AS QUASI-LEGITIMATION IN VILLAGE DEVELOPMENT Gajah, Nurhamidah; Hamdani, R.; Lubis, Zulkifli; Hasugian, Jonner
Proceeding International Seminar of Islamic Studies INSIS 6 (February 2024)
Publisher : Proceeding International Seminar of Islamic Studies

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The existence of traditional leaders who play a very important role in village development are traditional leaders, the term for traditional leaders in the villages in South Tapanuli Regency, North Sumatra Province area is Hatobangon. As an elder person in a clan or a Huta/village, Hatobangon plays a very important role in resolving problems that occur. The role of Hatobangon is to preserve, maintain, and encourage the community to maintain the traditions of their ancestors to work together with the village, sub-district, and district governments. Hatobangon also became quasi in protecting forests, rivers, and buffer areas to realize Ministry of Forestry or International NGO programs. This research aims to examine the partnership that occurs between the government and Hatobangon in village development in South Tapanuli Regency and the inhibiting and supporting factors between the government and Hatobangon in developing villages. The approach used in this study is qualitative and data collection techniques in this research used observation, interviews, and documentation studies. The Partnership Model in Increasing Hatobangon 's Capacity as a Quasi hopefully can be sustainable as a traditional institution in the Angkola Community. The partnership pattern that occurs between the government and Hatobangon in developing villages is the Subordinate union of partnership, Linear union of partnership, and Linear Collaborative of Partnership.

Co-Authors A Halim Nasution A. Husein Siregar Abd. Wahid Simangunsong Abdul Basyir, Abdul Abdul Ghofur Abdul Kadir Abdul Kadir Abdullah Muhazir, Abdullah Abid Muhtarom Abid Muhtarom, Abid Adityas, Muhammad Bahtiar Afandi, Randi Bachtiar Afdal Al Hafiz Affandy*, Nur Azizah Afina, Nudiya Agus Purwoko Agus Tonny Arifianto Agustinus S Agustrisno, Agustrisno Ahmad H. Siregar Al Fauzi, Dwiki Wahyu Al Hafiz, Afdal Alfian H. Siregar Alfian Hamsi Alfian Hamsi Siregar Alma Amalia Sabilla Andianto Pintoro Andrian Wahyu Prayogi Ardianto Pranata Arif, Saiful Nur armanda, vika Arvian Angga Baktiar Aswan Jaya Azlan Azlan Bachri, Affan Badaruddin & Humaizi Badaruddin & Humaizi Badaruddin Badaruddin Bagus Setiawan Bambang Eko Muljono Barita, Barita Bayu Azmi Bengkel Biliater Situngkir Bobby Damara BR. SEMBIRING, SRI ALEM Budiman Yudha Simbolon Butar Butar, Dewi Sartika Charloq Dahria, Muhammad Dalimunthe, Syukur Kholil Daulay, Harmona Deski Helsa Pane Dewi ANGGRAENI Dian M Nasution Dian M. Nasution Eka Debora Harianja Ekasari, Ratna Elisa Julianti Elisa Julianti Fahri Hidayah Farel H. Napitupulu Farel M Napitupulu Farid Aulia Farid, Mifta Farida Ariani Farida Ariani Fathia Rahmadini Fauzan Adzim Felix Hutapea, Juan Felix Hutapea Fernando P Gurning Fery Hadi Setiawan Fikarwin Zuska Firman W. Siahaan Firman W. Siahaan Gibran . Gideon Manik Ginting, Muhammad Adenan Hakam, Ahmad Hamdani, R. Hamdi, Misbakhul Hammam Rofiqi Agustapraja Harahap, Sutan Harahap, Yudhi Ramadani Harapan Panjaitan Hasugian, Jonner Heni Pujiastuti Hilman, Adrian Himsar Ambarita Husen - Hutabarat, Mutiara Hutasoi, Slamat Aditia Ibnutama, Khairi Ika Nur Lestari Ikhwansyah Isranuri Imam Sakroni Indra Milyardi Irfansyah, M. Iswan Ansukarto Sukardi Iswan, Mochammad Izzatul Mardhiah, Izzatul J. Elisa Jawanri Maurisco Saragih Jefri H Manik Jenny Elisabeth Julianti, Elisa Junita Lubis Junjungan Saut Bonar Pangihutan Simanjuntak kamil erwansyah Kamil Erwansyah Kamil, M Kusnasari, Sri Kustini, Rini Libert Sijabat Lubis, Junita Lubis, Zulkarnaian Lukman Hakim M. Husni M. Sabri Mahadi, Batu Mahyunis Marlinawati Nehe, Agnes Masyuni Hutasuhut Mauladi, Kemal Farouq Megy Stefanus Mhd Gilang Suryanata MUBA SIMANIHURUK Muhammad Adenan Ginting MUHAMMAD SYAFIK Muhammad Syahril Muhammad Zulfikri Mujahiddin, Mujahiddin Mukhadiroh, Lailiyah Mukhlis Ramadhan Muldani, Muldani Munaffidah, Erlindiyanti Saidatul Murbanto Sinaga Mutya Vonnisa Nainggolan, Sarah Nasution, Yusri Indra Nh, Ah. Syarifuddin Nirwana, Nico Nita Savitri Norman Pamungkas NUGRAHA MUNTHE Nurcahyo Budi Nugroho Nurdiana Nurdiana Nurdiana Nurdiana Nurdiana Nurdiana Nurhamidah Gajah Nuril Badriyah Nurul Badriyah Nurul Badriyah Oppusunggu, K. Oppusunggu, Kamrul Panjaitan, Harapan Panjaitan, Zaimah Piolina, Piolina Poltak Sirait Pramio G Sembiring Pratiwi, Neny Prayuda, Dimas Purwadi Purwadi Putri, Resta Ayuning Putri, Resta Ayuning R. Hamdani Harahap Raden Mohamad Herdian Bhakti Ramadhan, Mukhlis Ramadhan, Puji Sari riansah, wahyu Rudi Gunawan Ruswaji Salsabila, Unik Hanifah SAM, M Danny Sembiring, Ferry Sembiring, Ferry Sengly B. Damanik Setiyawan, Hendro Silaban, Jhon Adi F. Simatupang, Irfan Sinaga, Hotnida Sinaga, Murbanto Sinaga, Patar AP Sirait, Dielsie Naomi Ekaputri Sirait, Poltak Siregar, Achmad Husein Siregar, Desy Army Lestari Situngkir, Biliater Sobirin Sobirin Stefani Limanto Sustroyorini, Emalia Nova Sutrisno, Franky Syahril Gultom syaifuddin syaifuddin SYARIL GULTOM Tarigan, Bahtra Yudha Tekad Sitepu Terang UHS Ginting Terang UHSG Terip Karo-Karo Tulus B Sitorus Tulus B. Sitorus Tulus Burhanuddin Sitorus Tulus Burhanuddin Sitorus Tumpal H. Siregar Umri N Siregar Wahyu Purnomo, Wahyu Wibisono Wibisono Winata, Hendryan Yulfitra Zuhri Zahra Zulkarnaian Lubis Zulvia C.N Ginting zunaidi, mhd

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