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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
Arjuna Subject : -
Articles 12 Documents
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Search results for , issue "Vol 12, No 1: April 2019" : 12 Documents clear
Perencanaan Produksi Proses Pembuatan Alat Musik Flute Hapsari, Indri; Al Habshe, Azizah; Santoso, Amelia
Rekayasa Vol 12, No 1: April 2019
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (447.865 KB) | DOI: 10.21107/rekayasa.v12i1.4565

Abstract

PT. X di Pasuruan merupakan perusahaan industri manufaktur yang memproduksi alat-alat musik seperti, piano, keyboard, gitar dan bass, drum, alat tiup seperti flute, pianika, dan lain-lain. Tingginya jam lembur membuat penelitian ini terfokus pada parts process department section body process khusus alat musik flute. Produk jadi flute terdiri dari 3 part yang berupa flute head, flute body, dan flute foot yang diproduksi di parts process department section body process khusus memproduksi flute head, flute body, dan flute foot. Fluktuatifnya permintaan konsumen membuat pihak manajemen kesulitan untuk meramalkan berapa jumlah flute head, flute body, dan flute foot yang harus diproduksi secara tepat. Apabila hasil peramalan yang kurang tepat tersebut mengakibatkan adanya ketidaksesuaian antara jumlah permintaan dengan kapasitas produksi flute head, flute body, dan flute foot di PT. X. Oleh karena itu perlu adanya perencanaan produksi usulan agar dapat memenuhi permintaan sesuai dengan kapasitas yang dimiliki PT. X dan meminimumkan total biaya yang dikeluarkan. Perencanaan produksi usulan yang dilakukan menggunakan metode mix integer linear programming dengan bantuan software Lingo 11.0. Total biaya yang dikeluarkan untuk perencanaan produksi metode perusahaan sebesar Rp35.766.639.589 sedangkan, metode usulan sebesar Rp35.687.132.806. Metode usulan dapat melakukan penghematan total biaya produksi sebesar 0,22% yaitu Rp79.506.783.  Kata kunci:  Perencanaan produksi, Forecasting, Safety stock, Mix integer linear programming Production Planning of  Flute Musical Instrument Production ProcessAbstract— PT. X in Pasuruan is an industrial manufacturing company that produces musical instruments such as, piano, keyboard, guitar and bass, drums, flutes, pianica, etc. Highly overtimes is the reason why this research focuses on parts process department section body process specific to a flute. The flute consist of 3 parts which are flute head, flute body, and flute foot that produces on parts process department section body process. Fluctuatively consumer request had caused confusion for the management to accurately estimate the number of flute head, flute body, and flute foot to be produced. If the result of forecasting is not matching, therefore there is a difference in a number of orders and production capacity of flute head, flute body, and flute foot at PT. X Hence, there should be a production estimate plan to overcome the problem relating to the capacity at PT. YMPI at the same time minimizing costs. Mix integer linear programming method was used as a suggestion with the help of software Lingo 11.0. The total cost spent on the company method is Rp35.766.639.589, while the proposed method is Rp35.687.132.806. The proposal method of production and planning managed to cut the cost by 0,22% which is Rp79.506.783.Keywords:  Production and planning control, Forecasting, Safety stock, Mix integer linear programming.
Dampak Pemutihan Karang Keras pada Komunitas Ikan Karang dan Makrozoobenthos di Wilayah Perairan Tejakula, Buleleng, Bali Faiqoh, Elok; Karang, I Wayan Gede Astawa; Wiyanto, Dwi Budi
Rekayasa Vol 12, No 1: April 2019
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.274 KB) | DOI: 10.21107/rekayasa.v12i1.5290

Abstract

ABSTRAKPemutihan karang merupakan salah satu dampak dari perubahan iklim global, kenaikan suhu tersebut memberikan dampak negatif bagi keseimbangan ekosistem terumbu karang. ­Terumbu karang yang memutih dan kehilangan zooxanthella nya akan rentan terkena infeksi dan penyakit. Populasi komunitas ikan karang pemakan hewan karang dan makrozoobenthos juga akan menurun. Tujuan dari penelitian ini adalah untuk mengetahui besar dampak kerusa­kan terumbu karang dan dampaknya bagi populasi ikan dan makrozoobenthos. Survey dilakukan pada 3 titik di wilayah perairan Tejakula dengan metode reefcheck. Hasil penelitian menunjukkan kematian terumbu karang sebesar 5-7.5%, jumlah alga yang menutupi 3.125%. Kondisi ikan kepe-kepe yang merupakan pemakan hewan karang juga sudah ditemukan dalam jumlah cukup banyak. Keberadaan ikan herbivora dan makrozoobenthos herbivore membantu mengurangi jumlah alga yang menutupi. Sedangkan keberadaan ikan pemakan terumbu karang dan ikan predator memperlihatkan bahwa sistem ekologi yang ada di terumbu karang tersebut hampir kembali normal. Kata Kunci: terumbu karang, komunitas ikan karang, makrozoobenthos.The Impact of Hard Coral Bleaching in Coral and Macrozoobenthos Fish Communities in Tejakula, Buleleng, Bali Water AreasABSTRACTCoral bleaching is one of the consequences of global climate change, as the rise of temperature negatively impacts the ecological balance of reef ecosystems. Bleached coral reefs lose their zooxanthellae, increasing vulnerability to infection and disease and consequently, causing population decline of macrozoobenthos and reef fish communities which prey on coral-consuming organisms. This research aims to determine the degree of coral reef damage and its impact on fish and macrozoobenthos population. The survey was conducted on 3 stations in Tejakula waters with the reef check method. Results show that coral reef death reaches 5-7.5%, with algal coverage of 3.125%. Kepe-kepe fish which prey on coral-consuming animals were also found in relatively high abundance. The presence of herbivore fish and macrozoobenthos help reduce algal cover. Meanwhile, the presence of coral-consuming and predator fish indicate that the coral reef ecological system has mostly returned to normal. Keywords: coral reef, reef fish community, macrozoobenthos

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