Industrial and System Engineering

This paper presents a survey of simulation and optimization modeling approaches used in reservoir systems operation problems. Optimization methods have been proved of much importance when used with simulation modeling and the two approaches when combined give the best results. The main objective of this review article is to discuss simulation, optimization and combined simulationoptimization modeling approach and to provide an overview of their applications reported in literature. In addition to classical optimization techniques, application and scope of computational intelligence techniques, such as, evolutionary computations, fuzzy set theory and artificial neural networks, in reservoir system operation studies are reviewed. Conclusions and suggestive remarks based on this survey are outlined, which could be helpful for future research and for system managers to decide appropriate methodology for application to their systems.

A strategy for adaptive control and energetic optimization of aerobic fermentors was implemented, with both air flow and agitation speed as manipulated variables. This strategy is separable in its components: control, optimization, estimation. We optimized parameter’s estimation (from the usual KLa correlation) using sinusoidal excitation of air flow and agitation speed. We have implemented parameter’s estimation trough recursive least squares algorithm with forgetting factor. We carried separate essays on control, optimization and estimation algorithms. We carried our essays using an original computational simulation environment, with noise and delay generating facilities for data sampling and filtering.

Our results show the convergence and robustness of the estimation algorithm used, improved with use of both forgetting factor and KLa dead-band facilities. Control algorithm used in our work compares favorably with PID using the integrated area criteria for deviation between oxygen molarity and critical molarity (set point). Optimization algorithm clearly reduces energetic consumption, respecting critical molarity. Integration of control, optimization and adaptive algorithms was implemented, but future work is needed for stability. Methods were defined and implemented for stability improvement. We have implemented data acquisition and computer manipulation of air flow and agitation speed for actual fermentors.

Kesehatan dan Keselamatan Kerja (K3) merupakan aspek yang penting dalam industri. Industri pengolahan teh termasuk industri yang punya potensi kecelakaan tinggi, sebuah perusahaan pengolahan teh tahun 2018 mengalami kecelakaan kerja 94 kasus, dengan FR=5,04. Pareto kasus kecelakaan tertinggi adalah tergores, 34 kasus. Oleh sebab itu, perlu kajian identifikasi bahaya dan penilaian resiko di proses pengolahan teh, yaitu blending, filling dan packing. Kajian dilakukan dengan pendekatan metode HIRA (hazard identification & Risk Assesment). Metode HIRA dimulai dari identifikasi bahaya, menilai resiko dan pengendalian bahaya/resiko. Dari hasil observasi dan analisis data, bahaya yang teridentifikasi adalah bahaya mekanis dan kimia di semua proses.  Tahap kedua penilaian resiko dengan kategori extrim adalah terkena mesin press, terpapar bahan kimia dan terpeleset, dan semuanya di proses filling. Setelah dikendalikan dengan hirarki control bahaya, resiko terkena mesin press turun menjadi lo...

One of the products of PT. Kurnia Mustika Indah Lestari is the inner body of K56. In one month the product rejects amounted to 2.0%, which exceeds the tolerance limit set by the company, namely 0.5%. It is necessary to carry out research aimed at determining the root of the dominant problem that causes rejection of the inner K56 body and determining the quality improvement proposal. The method used is quality control with the DMAIC stage. The results of the research findings show that the dominant root cause of reject burry is that work instructions are not carried out (Method) and working in a hurry to quickly rest (Human). The reject scratch type is due to lack of skill (Method) and pursuing a lot of rest time (Human). The recommendation to improve the quality of the reject burry is to carry out work instructions, be more careful when loading the material into the dies, always clean the inside of the dies, checkman supervises the manpower of the production process so that it works...

Occupational health and safety is one of the necessary things in the industrial world. The problems that arose in the industrial era were the need for workers and increased productivity to be able to produce quality products. Health conditions and the availability of employee safety protections can affect work productivity. So that the safety and work safety culture in the workplace can be realized and can increase the safety performance index, an approach is implemented in the form of methods that can be applied to all organizations in the enterprise, one of which is behavior-based safety methods. The analysis of the data obtained shows that the factors that cause work accidents due to behavior are taken from the validity test, namely the factors of perception, communication and environment, because these three factors are very easily ignored by employees and company management. Environmental factors and personal protective equipment have no effect on work accidents as management a...

Linear programming is one of the most widely used operational research techniques in practice and is known for being easy to understand. The method in solving linear programming in "Naya Online Shopping" is by the graphical method and compared with LINGO software. The purpose of the completion of linear programming is to optimize the amount of production in obtaining maximum profits. And an optimal solution is obtained, namely a maximum profit of IDR 1,750,000. with 50 bags of "ting-ting bags" to be purchased from agents and many "crown wallets" to be purchased from agents of 100 pieces. From the maximum capacity of the shelter 150 pieces can be maximized by purchasing as many as 50 bags and purchasing 100 pieces of wallet. From the sensitivity test, it can be concluded that each capital increase or reduction of IDR 750,000 will result in a gain or loss of IDR 12,500. Completion of linear programming with research into the operation of graphical methods...

Perkembangan teknologi dengan pemanfaatan e-Commerce seharusnya memberikan kemudahan bagi Usaha Mikro Kecil dan Menengah (UMKM) di Kota Yogyakarta sehingga dapat mensejahterakan perekonomian di Indonesia. Salah satu cara yang digunakan untuk mengembangkan perekonomian yaitu melakukan pemasaran produk kerajian secara online menggunakan e-Commerce. Berdasarkan klasifikasi sebanyak 1895 pelaku UMKM kerajinan di Kota Yogyakarta yang baru terdaftar di website Dinas Perindustrian dan Perdagangan (DISPERINDAG) Kota Yogyakarta sebanyak 453 sehingga masih banyak yang belum memanfaatkan penggunaan e-Commerce dalam pemasaran produknya. Penelitian ini bertujuan untuk mengetahui faktor-faktor lingkungan eksternal yang mempengaruhi hambatan penggunaan e-Commerce pada UMKM kerajinan dan mengetahui pengaruh simultan terhadap faktor teknologi, faktor konsumen, faktor pesaing, dan faktor kebijakan pemerintah. Metode pengumpulan data dilakukan dengan melakukan penyebaran kuisioner dan wawancara sebany...