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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Jurnal Teknik Sipil Jurnal Pertahanan : Media Informasi tentang Kajian dan Strategi Pertahanan yang Mengedepankan Identity, Nasionalism dan Integrity Scientific Journal of Reflection : Economic, Accounting, Management and Business Jurnal Teknik Journal of Applied Sciences, Management and Engineering Technology (JASMET) Jurnal Signal

Arief Rachman

Unknown Affiliation

Author-ID : 1863292

Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Articles

Klasterisasi Sumber Penyebaran Virus Covid-19 dengan Menggunakan Metode K-MEANS Di Daerah Kota Cimahi dan Kab. Bandung Barat Hidayat, M. Reza; Arief Rachman
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 19 No 2 (2020): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jt.vol19no02.233

Virus Covid-19 berasal dari Kota Wuhan di China. Penularannya sangat cepat dan pesat ke berbagai belahan dunia termasuk di Indonesia. Penelitian ini membahas tentang klasterisasi sumber penyebaran virus covid-19 dengan metoda k-means menggunakan software WEKA untuk Kota Cimahi dan Kab Bandung Barat. Tujuan dari penelitian ini yaitu memperoleh informasi tentang 5 klaster sumber penyebaran virus Covid-19, yaitu klaster 0 (kantor), klaster 1 (tempat makan), klaster 2 (rumah), klaster 3 (perbelanjaan), dan klaster 4 (transportasi umum) selama bulan Mei sampai Juli 2020 untuk Kota Cimahi dan Kab Bandung Barat. Hasil dapat disimpulkan pada klaster 0 tertinggi dari Kab. Bandung Barat dengan rata-rata 0,05%, untuk klaster 1 dampak covid-19 tertinggi dari Kab. Bandung Barat dengan rata-rata 0,55%, untuk klaster 2 dengan rata-rata 0,02%, untuk klaster 3 dampak covid-19 tertinggi dari Kab. Bandung Barat dengan rata-rata 0,04%, untuk klaster 4 dampak covid-19 tertinggi dari Kota Cimahi dengan rata-rata 0,79%.

THE ABUNDANCE AND SPATIAL DISTRIBUTION OF PLANKTON COMMUNITIES IN BANGGAI ISLANDS WATERS Hikmah Thoha; Arief Rachman
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 5 No. 1 (2013): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Banggai Islands waters are mixing area between Banda Sea and Makassar Sea, thus resulting in the existence of many unique marine ecosystems. This conditon might also lead to the occurrence of unique and specific plankton community in the oceanic ecosystem of Banggai Islands. This research was conducted in 26 June to 8 July using Baruna VIII research vessel. Phytoplankton and zooplankton samples were collected in 14 stations using Kitahara and NORPAC plankton net. The plankton data in this research was analyzed with Bray-Curtis Clustering Analysis (Single Link), linear regression and Pearson correlation matrix. The results showed that zooplankton abundance was highest at the strait between Liang and Labobo Island, while phytoplankton was found abundant at eastern Tinangkung Island. On the other hand, Mesamat Bay was found having very low abundance of zooplankton and phytoplankton, which probably related to low nutrient availability in the water column. Calanoids, cyclopoids, and oikopleurans were dominant taxa with widest spatial distribution and highest importance value in zooplankton community of Banggai Islands. Meanwhile Chaetoceros, Rhizosolenia and Thalassiothrix were the dominant genus with widest spatial distribution and highest importance value in phytoplankton community. The result of clustering analysis showed that there were three stations with unique plankton community, and was found very different from the planktonic community in other stations. It was interesting to note that bottom-up control by nutrient availabilty, and top-down control by predator-prey interaction, probably not the main factor responsible for the unique pattern of plankton community structure of Banggai Islands. Keywords: plankton community, Banggai islands waters, Bray-Curtis clustering analysis, biological indices.

ZOOPLANKTON SPATIAL DISTRIBUTION AND COMMUNITY STRUCTURE IN BANGGAI SEA Arief Rachman; Elly Asniariati
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 4 No. 2 (2012): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Banggai Sea is an interesting ecosystem due to mixing influences from Banda Sea in the west and Maluccas Sea in the east. Therefore, a unique zooplankton community structure and specific distribution pattern should be found in this area. This research was carried on using Baruna Jaya VIII research vessel and samples were collected in 14 sampling stations. Vertical towing using NORPAC plankton net (300 μm) was conducted to collect zooplankton samples. Result showed that inner Mesamat Bay had the lowest abundance of zooplankton, probably due to low water quality resulted from anthropogenic activity. Meanwhile the strait between Liang and Labobo Island had the highest zooplankton abundance in Banggai Sea. Calanoids was the dominant zooplankton taxa in the ecosystem and contributing 55.7% of total density of zooplankton community. The highest importance value made this taxa to be very important factor that regulates the lower trophic level organisms. Results also showed that zooplankton was distributed nearly uniform in eastern but aggregated to several stations in western Banggai Sea. Zooplankton abundance was higher in the central of Banggai Sea, compared to western and eastern area. According to Bray-Curtis clustering analysis the strait between Liang and Labobo Island has unique zooplankton community structure. This might happened due to mixing of water from two highly productive seas that influenced the Banggai Sea ecosystem. From this research we conclude that this strait probably was the zooplankton hot spot area which might also indicate that this area also a hot spot of fishes in the Banggai Sea.Keywords: spatial distribution, zooplankton, community structure, hot spot, Banggai

POTENTIAL ROLES OF BIOTIC FACTORS IN REGULATING ZOOPLANKTON COMMUNITY DYNAMICS IN JAKARTA BAY SHALLOW WATER COASTAL ECOSYSTEM Arief Rachman; Nurul Fitriya
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 4 No. 1 (2012): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

The dynamics in zooplankton abundance were regulated by changes in water physical-chemical parameters and interaction with biotic factors. In this research we examined the relationship between zooplankton community dynamic and important biotic factors, such as predation and food availability, in Jakarta bay. Plankton samplings were done in 10 sampling stations in Jakarta bay, from July to November 2009. Zooplankton samples were collected using horizontal towing method with NORPAC plankton net (mesh size 300 μm). Salinity, water depth, water temperature, and water transparency were measured. Phytoplankton samples were also collected with the same method as zooplankton, using Kitahara plankton net (mesh size 80 μm). Zooplankton taxas were grouped into two groups, the prey and predatory zooplankton. The results showed that there were two different patterns in zooplankton groups dynamic i.e., the single and double peak. The abundance peak in most zooplankton groups, such as copepods, cirripeds, luciferids, and tunicates, were induced by the high food availability during the phytoplankton bloom in August. The high abundance of prey zooplankton groups in August was responded by the predatory zooplankton groups, resulting in high abundance of predatory zooplankton in adjacent month. The high abundance of ctenophores and chordates (fish larvae) were suggested as the main factor for the low abundance of other zooplankton in September. Physical and chemical factors were not the regulating factors due to the stability of those factors during this research period. Thus we concluded that food availability and predator-prey interaction were the main factors which regulate zooplankton community dynamics in Jakarta bay.Keywords: predator-prey interaction, zooplankton, abundance peak, food availability, phytoplankton bloom

Dinamika Seas dan Swell dari Laut China Selatan ke Teluk Jakarta: Studi Kasus Kejadian Badai Hagibis, November 2007 Nining Sari Ningsih; Arief Rachman; Safwan Hadi; Farrah Hanifah
Jurnal Teknik Sipil Vol 26 No 1 (2019)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2019.26.1.8

Karakteristik dinamika seas dan swell di sepanjang perairan Laut China Selatan-Teluk Jakarta pada waktu terjadi Badai Hagibis (18"“27 November 2007) dikaji dengan menggunakan metode pemodelan spektrum gelombang untuk mengetahui kontribusi gelombang yang dibangkitkan angin (gelombang angin) terhadap kejadian rob tanggal 25 November 2007 di pantai utara Jakarta. Pada penelitian ini, dilakukan pula uji coba simulasi model spektrum gelombang yang mengacu pada kedalaman tetap (batimetri) dan pada kedalaman total (jumlah batimetri dan pasang surut astronomis) untuk mengetahui pengaruh pasang surut astronomis terhadap hasil simulasi model gelombang yang dibangkitkan angin. Hasil simulasi menunjukkan bahwa gelombang angin di Teluk Jakarta pada tanggal 25 November 2007 didominasi oleh swell dengan tinggi gelombang ~11 cm yang diduga berasal dari Laut China Selatan sebagai daerah pembangkitan badai.Characteristics of seas and swell dynamics along South China Sea-Jakarta Bay waters during Cyclone Hagibis passage (18"“27 November 2007) have been studied using a spectral wave model to understand the magnitude of wind wave contribution to flooding event on November 25, 2007 along the northern coast of Jakarta. In this study, the model simulation was conducted using two kinds of water depth input, namely fixed water depth and timevarying water depths resulting from tides in order to obtain a better understanding of tidal influence on wind wave simulations. The simulated result shows that wind wave in the Jakarta Bay was dominated by swell with significant wave height of ~11 cm. It was expected that the swell propagated from the South China Sea as a storm generating area.

PENGARUH KOMPETENSI GURU DAN DISIPLIN KERJA TERHADAP KINERJA GURU DENGAN MOTIVASI KERJA SEBAGAI VARIABEL INTERVENING DI SMK SWASTA KOTA BEKASI Arief Rachman; Achmad Fauzi; Sri Maulidia Permatasari; Amri Darwis
SCIENTIFIC JOURNAL OF REFLECTION : Economic, Accounting, Management and Business Vol. 4 No. 3 (2021): SCIENTIFIC JOURNAL OF REFLECTION: Economic, Accounting, Management, & Business
Publisher : Sekolah Menengah Kejuruan (SMK) Pustek

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37481/sjr.v4i3.345

Abstract: The objective of this study was to evaluate the effect of competence and work discipline that can improve teachers performance with motivation as an intervening variable. In this study, dimensions were included as a limitation between variables. Data was processed using SmartPLS 3.0 which can also used to solve SEM problems. There were 350 teachers of private shchools in the city of Bekasi participated as respondents in this study. The results of this research show that: competence, work discipline had a positive and significant effect on motivation; competence, work discipline and motivation had a positive and significant effect on performance; the motivation variable as a mediation did not play a full role (partial mediation) in determining the direct relationship. Teachers should continuously develop their competencies in order to motivate and improve performance at work. Teachers with high motivation will promote their performance. This teachers need to increase motivation in the workplace in order to improve their performance.

STUDI TENTANG PERILAKU KONSUMEN DALAM PEMBELIAN TELEPON SELULER DI KALANGAN REMAJA DI DESA CIWARINGIN KECAMATAN CIWARINGIN KABABUPATEN CIREBON Delima Puspa Indah; Arief Rachman; Welly Wihayati
JURNAL SIGNAL Vol 1, No 1 (2013): JURNAL SIGNAL
Publisher : Universitas Swadaya Gunung Djati

Consumer behavior are acts process and social relations by individuals, groups or organizations in the use of a product. The purpose of this paper: 1. To determine the trend of mobile phone users among teenagers; 2. To find older motivation in buying mobile phones, and 3. To determine the presence of a cell phone salesman in shaping consumer behavior, especially the youth. The research method used in this study is a qualitative method, deksiptif approach to research that gives an overview to the reader and reveal a problem, situation, event, and how the facts revealed in detail. As a result, the Village Ciwaringin teenagers tend to buy cell phones because of the advancement of technology and television advertising. Perilaku konsumen adalah tindakan-tindakan proses dan hubungan sosial yang dilakukan individu, kelompok atau organisasi dalam menggunakan suatu produk. Tujuan dari penulisan ini; 1. Untuk mengetahui kecenderungan pengguna telepon seluler dikalangan remaja; 2. Untuk mengetahui motivasi remaja dalam membeli telepon seluler; dan 3. Untuk mengetahui keberadaan penjual telepon seluler dalam membentuk perilaku konsumen khususnya para remaja. Metode penelitian yang digunakan dalam penelitian ini adalah metode kualitatif, dengan pendekatan deksiptif yaitu penelitian yang memberikan gambaran kepada pembaca dan mengungkapkan suatu masalah, keadaan, peristiwa, dan bagaimana adanya mengungkapkan fakta secara detail. Hasilnya, kalangan remaja Desa Ciwaringin cenderung membeli telepon seluler karena kemajuan teknologi dan iklan televise.

MANAGEMENT OF PANCASILA AND CITIZENSHIP EDUCATION IN THE PREVENTION AND HANDLING OF RADICALISM AND TERRORISM IN THE STATE DEFENSE SYSTEM Mukhtadi Mukhtadi; Arief Prayitno; Arief Rachman; Putra Sang Fajar El Harry
Jurnal Pertahanan: Media Informasi ttg Kajian & Strategi Pertahanan yang Mengedepankan Identity, Nasionalism & Integrity Vol 8, No 1 (2022)
Publisher : The Republic of Indonesia Defense University

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

Radicalism and terrorism have become a world problem including in Indonesia and become a serious threat to the country's defense system, there are need are global cooperation in the handling of radicalism and terrorism. Indonesia based on Law No. 20 of 2003 Article 37 paragraphs (1) and (2) on the National Education System mentions that Citizenship Education must be contained in the basic education curriculum, secondary education, and higher education. This research aims to find out, how is the prevention and handling of radicalism and terrorism in Indonesia and how is the management strategy of Pancasila, and Citizenship Education in the prevention and handling radicalism and terrorism in Indonesia. This study uses a combination research method, of digging data with questionnaires distributed through a google form, and links shared through email messaging facilities and WhatsApp in a chain. The survey was conducted to see how Pancasila and Citizenship Education play on radicalism and terrorism and to explore data from various sources, documents, and journals related to the research focus. The results of the study showed that Pancasila and Citizenship Education played a significant role in the prevention and countermeasures of radicalism, terrorism reached 99%. The results of this study are expected to be one of the input materials for the relevant parties in taking policies on strategies to prevent and deal with radicalism and terrorism. It also encourages the involvement of the world of education and society towards Pancasila and Citizenship education and implements it in the life of the nation and state.

HOSPITAL LENGTH OF STAY PREDICTION WITH ENSEMBLE LEARNING METHODE Dian Puspita Hapsari; Waras Lumandi; Arief Rachman
Journal of Applied Sciences, Management and Engineering Technology Vol 4, No 1 (2023)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2023.v4i1.4437

The hospital length of stay (LoS) is the number of days an inpatient will stay in the hospital. LoS is used as a measure of hospital performance so they can improve the quality of service to patients better. However, making an accurate estimate of LoS can be difficult due to the many factors that influence it. The research conducted aims to predict LoS for treated patients (ICU and non-ICU) with cases of brain vessel injuries by using the ensemble learning method. The Random Forest algorithm is one of the ensembles learning methods used to predict LoS in this study. The dataset used in this study is primary data at PHC Surabaya Hospital. From the results of the simulations performed, the random forest algorithm is able to predict LoS in a dataset of treated patients (ICU and non-ICU) with cases of brain vessel injuries. And the simulation results show a type II error value of 0.10 while the value of type I error is 0.16.

Co-Authors ACHMAD FAUZI Amri Darwis Arief Prayitno Delima Puspa Indah Dian Puspita Hapsari Elly Asniariati Farrah Hanifah Hidayat, M. Reza Hikmah Thoha Mukhtadi, Mukhtadi Nining Sari Ningsih Nurul Fitriya Putra Sang Fajar El Harry Safwan Hadi Sri Maulidia Permatasari Waras Lumandi Welly Wihayati

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