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Opportunities and Challenges for Indonesian Merchants in the Serikin Market Ayuni, Hesti Diah; Marcella, Nadya; Gea, Havizal Syahrizen; Kurniasih, Erni Panca; Rosyadi, Rosyadi
Sebatik Vol. 29 No. 1 (2025): June 2025
Publisher : STMIK Widya Cipta Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46984/sebatik.v29i1.2566

Abstract

Serikin Market, located on the border of Malaysia and Indonesia, is a bustling cross-border trading center with informal sector players. The market offers great opportunities for informal businesses to increase their income and expand their business, thanks to the high shopping interest of local people and tourists who are interested in Indonesian products. However, there are various challenges that informal traders face, such as limited infrastructure and supporting facilities. This study aims to identify and analyze the strengths, weaknesses, opportunities, and threats of the informal sector involved in trading at Serikin Market from Indonesia. As well as, determining the right strategy to optimize the informal sector involved in trading in Serikin Market. The research method used is descriptive qualitative analysis. Data were collected through observation, interviews, and library studies. The technique used is phenomenological analysis. The results showed that before and after the inauguration of the Jagoi Babang Cross Border Post did not change the income earned, only changes in regulation and access. Serikin Market has the power to attract traders and consumers from various countries. The strategic location, uniqueness of local products, competitive prices, and cultural appeal make Serikin Market an ideal place for traders to sell their products. It can provide great opportunities for traders, especially since many consumers from Malaysia are interested in Indonesian products, so the traders can earn a large profit. However, the main drawback faced is the lack of good market management and also faces challenges, such as limited infrastructure. The market is often not equipped with adequate facilities such as a large parking area, proper selling space, and clean public toilets.
Pengembangan Media Pembelajaran BETAMATH untuk Meningkatkan Pemahaman Siswa pada Materi Barisan dan Deret Aritmetika Sriyanti, Linda; Rosyadi, Rosyadi; Taufan, Mochammad
Indo-MathEdu Intellectuals Journal Vol. 6 No. 4 (2025): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v6i4.3582

Abstract

The limited student understanding of arithmetic sequences and series, along with the minimal use of interactive Android-based learning media, served as the foundation for this study. The main objective of this research was to develop and evaluate the effectiveness of an Android-based learning application called BETAMATH in enhancing students' comprehension of the topic. This study employed a Research and Development (R&D) approach, using the 4D development model, which includes the stages of Define, Design, Develop, and Disseminate. The developed product was validated by subject matter experts, media specialists, and pedagogical experts, and was tested on tenth-grade students. Validation results indicated that BETAMATH is suitable for use in the classroom. Practicality testing revealed that the application is easy to use, based on student feedback and teacher observations. The effectiveness of the media was confirmed by a significant improvement in students' understanding, as shown by pretest and posttest results. Therefore, BETAMATH is considered valid, practical, and effective for improving student understanding of arithmetic sequences and series, and holds promise as an innovative alternative to support mathematics instruction in schools.  
PEMANFAATAN FERMENTASI LINDI SAMPAH PERKOTAAN DALAM MEDIA KULTUR TERHADAP BIOMASSA DAN KOMPOSISI KIMIA Chlorella sp. Hadi, Khairul; Rosyadi, Rosyadi
Media Akuakultur Vol 19, No 2 (2024): Desember 2024
Publisher : Politeknik Kelautan dan Perikanan Bone

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/ma.19.2.2024.71-79

Abstract

Lindi merupakan cairan yang terbentuk dalam timbunan sampah dan berpotensi sebagai pencemar lingkungan. Namun apabila diolah lindi dapat menjadi sumber unsur hara untuk kultur Chlorella sp.. Penelitian ini dilakukan untuk mengetahui pengaruh lindi dalam media kultur dan mendapatkan konsentrasi lindi terbaik untuk meningkatkan biomassa serta komposisi kimia Chlorella sp.. Penelitian menggunakan rancangan acak lengkap dengan 5 perlakuan, yaitu pemberian lindi 5, 10, 15, 20 dan 25% dan masingmasing perlakuan terdiri dari 3 ulangan. Sebelum digunakan, lindi disaring dan dicampur dengan 20 g gula merah yang dihancurkan, 1 L akuades, 15 mL Effective Microorganism4 (EM4 ), dan kemudian difermentasi selama 1 hari. Kultur dilakukan dalam galon berkapasitas 20 L yang diisi dengan 16 L air tawar, dengan penerangan menggunakan lampu dengan intensitas 2500 lux. Proses kultur berlangsung selama 20 hari, dengan parameter yang diukur meliputi kepadatan sel, biomassa, kandungan proksimat, asam amino, kadar nitrat, fosfat, dan kualitas air (suhu, pH, dan DO). Hasil penelitian menunjukkan pemberian lindi dalam media kultur berpengaruh nyata terhadap biomassa Chlorella sp. (p<0,05) dengan konsentrasi lindi terbaik pada perlakuan 25%, yaitu biomassa sebesar 0,44 ± 0,00 g L-1, mengandung protein 31,208%, lemak 7,125%, karbohidrat 31,217%, kadar air 26,975% dan kadar abu 3,475%. Temuan ini menunjukkan bahwa lindi dapat digunakan sebagai alternatif sumber nutrisi untuk meningkatkan produktivitas Chlorella sp., dengan konsentrasi 25% sebagai yang paling optimal.Leachate is a liquid that forms in landfills and can be an environmental pollutant. However, if the leachate is processed, it can become a source of nutrients for Chlorella sp. culture. This research was conducted to determine the effect of leachate in the culture medium and to obtain the best leachate concentration to increase the biomass and chemical composition of Chlorella sp.. The research used a completely randomized design with five treatments, namely the addition of 5%, 10%, 15%, 20%, and 25% leachate, with each treatment consisting of three replications. Before use, the leachate was filtered and mixed with 20 g of crushed brown sugar, 1 L of distilled water, 15 mL of Effective Microorganism 4 (EM4 ), and then fermented for 1 day. The culture was conducted in a 20 L gallon filled with 16 L of freshwater, illuminated with a light intensity of 2500 lux. The culturing process lasted for 20 days, with parameters measured including cell density, biomass, proximate content, amino acids, nitrate, phosphate, and water quality (temperature, pH, and DO). The results showed that the addition of leachate in the culture media had a significant effect on the biomass of Chlorella sp. (p<0.05), with the best leachate concentration being 25%, yielding a biomass of 0.44±0.00 g L-1 , containing 31.208 % protein, 7.125 % lipid, 31.217 % carbohydrates, 26.975 % moisture content, and 3.475% ash content. These findings indicate that leachate can be used as an alternative nutrient source to enhance the productivity of Chlorella sp., with a 25% concentration being the most optimal
Desain Pembelajaran Materi Transformasi Geometri dengan Model Problem Based Learning Terhadap Pemahaman Konsep Dilatasi Oktaviana, Tia; Gunadi, Farid; Rosyadi, Rosyadi; Trapsilawati, Endah
Imajiner: Jurnal Matematika dan Pendidikan Matematika Vol 7, No 4 (2025): Imajiner: Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/imajiner.v7i4.22710

Abstract

Penelitian ini secara umum bertujuan untuk mendesain materi pembelajaran Dilatasi dengan model Problem Based Learning terhadap pemahaman konsep. Tujuan khususnya adalah mendesain pembelajaran mengenai dilatasi yang layak, praktis, dan efektif. Penelitian ini menggunakan model pengembangan 4D ( Define, Design, Develop , dan Disseminate ). Pada tahap Define , dilakukan analisis kebutuhan melalui observasi dan wawancara dengan siswa, guru, dan wakil kepala sekolah untuk mengidentifikasi kendala pembelajaran. Tahap Desain meliputi perancangan modul ajar, LKPD, serta perangkat asesmen berbasis PBL. Selanjutnya pada tahap Develop , dilakukan uji kelayakan oleh ahli media, materi, dan pedagogi, serta uji kepraktisan melalui implementasi di kelas dan uji efektivitas menggunakan tes pemahaman konsep. Hasil penelitian ini menunjukkan bahwa desain pembelajaran yang dikembangkan dinyatakan layak berdasarkan hasil validasi ahli, praktis berdasarkan respon siswa dan observasi guru dengan persentase sebesar 97%, serta efektif dalam meningkatkan pemahaman konsep dilatasi berdasarkan hasil post-test dengan nilai signifikan (sig. 0,05). Modul ajar ini juga telah didistribusikan melalui platform yang berani untuk dimanfaatkan secara lebih luas. Berdasarkan hasil penelitian disimpulkan pengembangan modul ajar matematika layak dan praktis digunakan pada materi pembelajaran Dilatasi, dan efektif terhadap kemampuan pemahaman konsep.
Problem Based Learning Design Based on Culturally Responsive Teaching for Understanding the Concept of Opportunity Drajat, Widi Rahmawati; Gunandi, Farid; Rosyadi, Rosyadi; Komariah, Komariah
JPMI (Jurnal Pendidikan Matematika Indonesia) Vol 10, No 2 (2025): Volume 10 Number 2, September 2025
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jpmi.v10i2.6906

Abstract

This study aims to develop a mathematics learning design that integrates Problem-Based Learning (PBL) with the Culturally Responsive Teaching (CRT) approach to improve the understanding of probability among Grade XII SMK students. The background of this study is the problem of low student understanding of probability material caused by minimal mathematical reasoning skills, low motivation to learn, and the dominance of conventional methods such as lectures and practice questions. Students also have difficulty solving contextual problems and applying enumeration rules. The CRT approach is considered to make learning more relevant because it links the material to the student's cultural background, while PBL encourages active participation and the development of critical thinking skills through solving real problems. The research method used is the 4D development model, which consists of the Define, Design, Develop, and Disseminate stages. In the Define stage, a needs analysis is conducted through teacher interviews to determine the challenges and readiness to implement PBL-CRT-based learning. The design stage produces a prototype of the learning design, teaching modules, and evaluation tools. The development phase includes a feasibility test by experts, a practical test in the classroom, and an effectiveness test by analyzing students' interests and learning outcomes. The results of the feasibility test showed that the module was feasible to use (Asymp. Sig = 0.004 <0.05), the practicality test obtained a score of 4 and 5 out of 97%, and the effectiveness test showed that the module significantly increased learning interest (Sig. = 0.01 <0.05). The dissemination phase was carried out by distributing the learning products online through the website. The results of the study showed that the learning design combining PBL and CRT can significantly improve students' understanding of mathematical concepts and create a learning atmosphere.Desain Pembelajaran Problem Based Learning Berbasis Culturally Responsive Teaching terhadap Pemahaman Konsep PeluangABSTRAKPenelitian ini bertujuan untuk mengembangkan desain pembelajaran matematika yang mengintegrasikan Problem Based Learning (PBL) dengan pendekatan Culturally Responsive Teaching (CRT) guna meningkatkan pemahaman konsep peluang pada siswa kelas XII SMK. Latar belakang penelitian ini adalah rendahnya pemahaman siswa terhadap peluang materi, yang disebabkan oleh minimnya keterampilan penalaran matematis, rendahnya motivasi belajar, serta dominasi metode konvensional seperti ceramah dan latihan soal. Siswa juga kesulitan dalam menyelesaikan soal kontekstual dan menerapkan kaidah pencacahan. Pendekatan CRT dinilai mampu menjadikan pembelajaran lebih relevan karena materi terkait dengan latar belakang siswa, sementara PBL mendorong keterlibatan aktif dan pengembangan kemampuan berpikir kritis melalui pemecahan masalah nyata. Metode penelitian yang digunakan adalah model pengembangan 4D, yang terdiri atas tahapan Define, Design, Develop, dan Disseminate. Pada tahap Define, dilakukan analisis kebutuhan melalui wawancara dengan guru untuk mengetahui tantangan dan kesiapan penerapan pembelajaran berbasis PBL-CRT. Tahap Desain menghasilkan prototipe rencana pembelajaran, modul terbuka, dan instrumen evaluasi. Tahap Pengembangan meliputi uji kelayakan oleh para ahli, uji kepraktisan di kelas, serta uji efektivitas melalui analisis minat dan hasil belajar siswa. Hasil uji kelayakan menunjukkan modul layak digunakan (Asymp.Sig = 0.004 < 0.05), uji kepraktisan memperoleh skor 4 dan 5 sebesar 97%, dan uji efektivitas menunjukkan bahwa modul meningkatkan minat belajar secara signifikan (Sig. = 0.01 < 0.05). Tahap Disseminate dilakukan melalui penyebaran produk pembelajaran secara berani melalui website. Hasil penelitian menunjukkan bahwa desain pembelajaran yang menggabungkan PBL dan CRT mampu meningkatkan pemahaman konsep matematika siswa secara signifikan, serta menciptakan suasana belajar yang lebih inklusif, kontekstual, dan relevan dengan pengalaman serta budaya siswaKata Kunci :problem based learning; culturally responsive teaching; peluang; desain pembelajaran; pemahaman konsep
Factors Causing Stunting and the Value of Economic Losses Due to Stunting in Ketapang Regency Tri Kurniasih, Albertin; Rosyadi, Rosyadi; Bariyah, Nurul
Journal of World Science Vol. 3 No. 2 (2024): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v3i2.566

Abstract

This research aims to examine the influence of the factors that cause stunting and the value of economic losses due to stunting in Ketapang Regency by using the factors that cause stunting that are studied, namely food security, social environment, health environment, and residential environment. The method used in this research is descriptive quantitative research. The population used was 88 people with stunted children and 30 people with non-stunted children. The data analysis technique used is the chi-square test statistical analysis program facility using SPSS. The results of this study show that there is a significant relationship between the social environment, social environment, and health environment in the incidence of stunting in the Ketapang district. However, the residential environment has an insignificant relationship with stunting in Ketapang Regency. Moreover, the economic loss caused by stunting, assuming a decrease in productivity of 2 percent to 9 percent, is estimated to range from 1 percent to 10.8 percent of Ketapang's GRDP, or approximately 200 billion rupiah to 1.8 trillion rupiah, thereby underlining the urgency for targeted interventions and policy initiatives to address this issue effectively.
UNCERTAINTY IN THE RICE SUPPLY CHAIN DURING PRE AND POST PANDEMIC - A CROSS CASE OF AGRICULTURAL COOPERATIVES IN INDONESIA Rosyadi, Rosyadi; Wijaya, Adi
Agrisocionomics: Jurnal Sosial Ekonomi Pertanian Vol 8, No 1 (2024): March 2024
Publisher : Faculty of Animal and Agricultural Science, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/agrisocionomics.v8i1.18713

Abstract

Even though the social order is starting to recover from the risk of Covid-19 transmission, but the performance of food security is still constrained in some countries, including Indonesia, where the majority of the population consumes rice. If the infection rate spikes again, it can hamper the supply chain for food commodities such as rice. From this paper, the research target focuses on the structure of the supply chain in rice under government supervision operated by a national company. In distribution capacity, domestic rice is a local type of superior quality to every interisland agricultural cooperative in Indonesia. Overall, this scientific paper calculates the multidimensional disruption in the rice supply chain from across the major islands in Indonesia During a normal situation and after a pandemic. A series of annual report data sourced from the Central Bureau of Statistics (BPS) are tabulated using parametric regression. The research sample is framed in a combination of agricultural cooperatives in 6 objects in Indonesia based on 12 key variables. The time panel is divided into two compositions: 2017–2019 (pre–Covid) and 2020–2022 (post–Covid). The output of the study clarifies that there is a significant relationship between pre–Covid and post–Covid to the manufacturing industry, quality control, logistics, land infrastructure, and sales significantly. Then, there was a significant link between pre–Covid and post–Covid from paddy production to the manufacturing industry mediated by supply, logistics to agricultural cooperatives mediated by land and marine infrastructure, then agricultural cooperatives to consumers mediated by sales. In relation to this research, the participation of stakeholders is suggested to adopt schemes and controls that are integrated with the transition of the rice supply chain. 
Penentuan Alternatif Alat Tangkap Ramah Lingkungan untuk Keberlanjutan Perikanan Tangkap di Kabupaten Kubu Raya Atmajaya, Onesimus Dhyas Dwi; Rosyadi, Rosyadi; Hisyam, Muhammad
Nekton Vol 1 No 2 (2021): October
Publisher : Politeknik Negeri Sambas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (438.29 KB) | DOI: 10.47767/nekton.v1i2.291

Abstract

Kubu Raya Waters has a lot of fishery resources and especially is giant prawns. A fisheries utilization in Kubu Raya Regency using by fishing gears that using in common waters or open waters. However, a problem of capture fisheries faced there is using destructive fishing gears like trawls. Trawls used by fishermen are threats to sustainable fishery resources and environments. Solutions for solving the problem of sustainable fishery resources in Kubu Raya Regency is determination eco-friendly fishing gear. The purpose of this research is to determine an alternative of most eco-friendly fishing gears that are recommended for fisheries activity in Kubu Raya like gillnet, trammel net, handling, and fishing trap. A method from this research using a score standardized function with many factors are; technology, social policy, economic, and environments. The result of this research determined that a gillnet is a recommended fishing gear for all aspects.
PENGARUH KONSENTRASI LINDI YANG DIFERMENTASI DENGAN AKTIFATOR MIKROORGANISME EM4 TERHADAP KEPADATAN SEL Chlorella sp. Hadi, Khairul; Rosyadi, Rosyadi
Jurnal Riset Akuakultur Vol 17, No 4 (2022): (Desember 2022)
Publisher : Politeknik Kelautan dan Perikanan Jembrana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jra.17.4.2022.215-226

Abstract

Lindi merupakan cairan yang terbentuk dalam timbunan sampah yang kaya akan nutrisi dan dapat digunakan sebagai unsur hara untuk kultur mikroalga jenis Chlorella sp. Penelitian ini bertujuan untuk mendapatkan konsentrasi lindi yang difermentasi dengan aktifator mikroorganisme EM4 terhadap kepadatan sel Chlorella sp. Design experiment yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan lima perlakuan dan tiga ulangan, yaitu P1 konsentrasi lindi 5%, P2 (10%), P3 (15%) P4 (20%), dan P5 (25%). Parameter yang diamati yaitu kepadatan sel, laju pertumbuhan spesifik, kadar nitrat dan fosfat, serta kualitas air (suhu, pH, dan oksigen terlarut). Data dianalisis dengan ANAVA menggunakan software SPSS 25. Kepadatan tertinggi diperoleh pada konsentrasi 25% sebesar 731,1 ± 2,55 ×104 sel mL-1, dengan puncak pertumbuhan pada hari ke-16. Kepadatan sel terendah pada konsentrasi 5% sebesar 256,4 ± 6,25 ×104 sel mL-1, dengan puncak pertumbuhan pada hari ke-6, laju pertumbuhan spesifik tertinggi pada konsentrasi lindi 5% sebesar 0,19 ± 0,00 sel mL-1 hari-1 dan terendah pada konsentrasi lindi 20% sebesar 0,08 ± 0,00 sel mL-1 hari-1. Berdasarkan hasil penelitian dapat disimpulkan bahwa perbedaan konsentrasi lindi yang difermentasi dengan EM4 berpengaruh sangat nyata terhadap produksi Chlorella sp.Leachate is a liquid formed in heaps of waste that is rich in nutrients and could be used to supply the required nutrients in microalgae cultures such as Chlorella sp. This experiment aimed to determine the effect of different concentrations of leachate fermented using EM4 microorganism activator on the cell density of Chlorella sp. The experimental design used a Completely Randomized Design (CRD) with five treatments and three replications: P1 (5% leachate concentration), P2 (10%), P3 (15%), P4 (20%), and P5 (25%). The observed parameters were cell density, specific growth rate, nitrate and phosphate levels, and water quality (temperature, pH, and dissolved oxygen). The data were analyzed using ANOVA using SPSS 25 software. The highest density of Chlorella sp. was 731.1 ± 2.55 ×104 cells mL-1obtained by P5 treatment recorded at the growth peak in the 16th day. The lowest cell density of Chlorella sp. was measured in P1 treatment at 256.4 ± 6.25 ×104 cells mL-1 during the growth peak on day 6th. The highest and lowest specific growth rates of Chlorella sp. were observed in P1 (0.19 ± 0.00 cells mL-1 day-1)and P4 treatments (0.08 ± 0.00 cells mL-1 day-1), respectively based on these results, this recent study concludes that the fermented leachate using EM4 is capable of suppying sufficient nutrient and thus has a very significant effect on the production of Chlorella sp.
Improving Students' Problem Solving Abilities through the Application of Auditory Intellectually Repetition Model Ismunandar, Denni; Rosyadi, Rosyadi; Nurafifah, Luthfiyati; Jofre, Ahmad
Journal of Instructional Mathematics Vol. 3 No. 2 (2022): Connecting Mathematical Concepts in Learning and Solving Problems
Publisher : Pendidikan Matematika STKIP Kusuma Negara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37640/jim.v3i2.1385

Abstract

The purpose of this study is to know the improvement of students' problem solving ability through the Application of auditory intellectually repetition (AIR) model. This research method uses the quantitative method by taking one experimental class. Samples were assigned from one Public Vocational School in Indramayu, by a purposive technique, based on the selection of teaching teachers. They were from X TKJ2 consisting of 29 students. Data retrieval uses a pretest and posttest of problem solving abilities. Based on the results of data analysis: (i) the student's pretest got the lowest and highest score respectively 6 and 23, and the average was 14.42, (ii) the student's posttest got the lowest and highest score respectively 21 and 38, and the average was 31.17. The maximum score for the pretest and posttest is 40. Based on the hypothesis test using the t-test obtained the observation value of t was 6 and the critical value of t was 2.03, because of that the AIR model was effectively implemented in learning in the classroom. Furthermore, a gain score test was carried out, and then the results were obtained by using the AIR model to improve students' problem solving abilities.