Computational Optimal Control

Subchan, Subchan; bikowski, Rafa

doi:10.1002/9780470747674

Cited by 32 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The phenomena of suspended sediment accumulation nearby the boundary lake that founded from the analytic and numeric solution is overcome by governing double parameter controlled model. The solution of the controlled model is observed using minimum Pontryagin principle in Subiono (2013) and Subchan (2009).…”

Section: The Methodsmentioning

confidence: 99%

Optimal control of suspended sediment distribution model of Talaga lake

Ratianingsih¹,

Resnawati²,

Azim³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

b_widodo@matematika.its.ac.idAbstract. Talaga Lake is one of several lakes in Central Sulawesi that potentially to be managed in multi purposes scheme because of its characteristic. The scheme is addressed not only due to the lake maintenance because of its sediment but also due to the Algae farming for its biodiesel fuel. This paper governs a suspended sediment distribution model of Talaga lake. The model is derived from the two dimensional hydrodynamic shallow water equations of the mass and momentum conservation law of sediment transport. An order reduction of the model gives six equations of hyperbolic systems of the depth, two dimension directional velocities and sediment concentration while the bed elevation as the second order of turbulent diffusion and dispersion are neglected. The system is discreted and linearized such that could be solved numerically by box-Keller method for some initial and boundary condition. The solutions shows that the downstream velocity is play a role in transversal direction of stream function flow. The downstream accumulated sediment indicate that the suspended sediment and its changing should be controlled by optimizing the downstream velocity and transversal suspended sediment changing due to the ideal algae growth need.

show abstract

Section: The Methodsmentioning

confidence: 99%

Optimal control of suspended sediment distribution model of Talaga lake

Ratianingsih¹,

Resnawati²,

Azim³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Untuk mencegah efek merugikan tersebut, dapat dilakukan beberapa cara, salah satunya adalah pemakaian tabir surya (4) . Tabir surya (sunscreen) adalah bahan yang dapat mengabsorbsi, memantulkan, atau menghamburkan radiasi UV sehingga dapat menjaga kulit dari efek UV yang membahayakan (5) .…”

Section: Bahan Dan Metodeunclassified

Formulasi Sediaan Krim Tabir Surya dari Ekstrak Etanol Buah Bisbul (Diospyros blancoi)

Noviardi¹,

Ratnasari²,

Fermadianto³

2019

jifi

View full text Add to dashboard Cite

Bisbul fruit is one of the tropical plants that grows in Indonesia. Phytochemical contents of bisbul fruit are alkaloids, tannins, fl avonoids, and phenolic compounds. Flavonoids and phenolic compounds are potentially as antioxidants. Antioxidants could inhibit skin cell damage due to oxidation process. This study aimed to make the optimum sunscreen cream, based on quality, stability, and activity as a sunscreen from bisbul fruit (Diospyros blancoi). The sample used in this research was bisbul, which made into extract. The extraction was done by a maceration method using 95% ethanol solvent. The results showed that extract yield obtained was 12%. Furthermore, made into a sunscreen cream preparation with concentrations of 10, 20, and 40%. The cream had been made, then was evaluated the quality organoleptic test, pH, adhesiveness, dispersive power, viscosity, stability, and the Sun Protection Factor (SPF) value. The results showed that of bisbul extract could be made into a sunscreen cream. The SPF value obtained from the extract concentration of 10, 20, and 40% consecutively were 9.25, 10.02, and 13.00. Furthermore, it could be concluded that the formula with a concentration of 40% was the best quality of the cream and the highest SPF value of 13.00 with maximum protection.Abstrak: Buah bisbul merupakan salah satu tanaman tropis yang tumbuh di Indonesia. Kandungan fi tokimia buah bisbul antara lain golongan senyawa alkaloid, tanin, fl avonoid, dan fenolik. Golongan senyawa fl avonoid dan fenolik berpotensi sebagai antioksidan. Antioksidan dapat menghambat proses kerusakan sel kulit akibat oksidasi. Penelitian ini bertujuan untuk membuat krim tabir surya yang optimum, sesuai mutu, stabilitas, dan memiliki khasiat sebagai tabir surya yang berbahan dasar buah bisbul (Diospyros blancoi). Sampel yang digunakan dalam penelitian ini adalah buah bisbul setengah matang yang dibuat menjadi ekstrak kental. Ekstraksi dilakukan dengan metode maserasi menggunakan pelarut etanol 95%. Hasil rendemen ekstrak yang diperoleh sebesar 12%. Selanjutnya, dibuat menjadi sediaan krim tabir surya dengan konsentrasi 10, 20, dan 40%. Krim yang telah dibuat, kemudian dievaluasi kualitas krim meliputi uji organoleptik, uji pH, daya lekat, daya sebar, viskositas, stabilitas, dan nilai Sun Protection Factor (SPF). Berdasarkan pada hasil penelitian, ekstrak buah bisbul dapat dibuat menjadi sediaan krim tabir surya. Nilai SPF yang diperoleh dari konsentrasi ekstrak 10, 20, dan 40% secara berturut-turut adalah 9,25; 10,02; dan 13,00. Pada penelitian ini dapat disimpulkan bahwa formula dengan konsentrasi 40% merupakan krim terbaik yang memiliki nilai SPF tertinggi sebesar dengan proteksi kategori maksimal.Kata kunci: Buah bisbul (Diospyros blancoi), krim, SPF, tabir surya.

show abstract

“…The approach known as the indirect method, used in our previous publications [18,17], attempts to preserve the infinite dimensional nature of the problem [26] and uses Pontraygin's maximum principle to solve a TPBVP. The disadvantage of the indirect method lies in the fact that the boundary problem with the transversality condition is often difficult to solve, and can become further encumbered in the presence of path constraints.…”

Section: The Optimal Control Problemsmentioning

confidence: 99%

Immune therapeutic strategies using optimal controls with L 1 and L 2 type objectives

Bara

Djouadi

Day

et al. 2017

Mathematical Biosciences

View full text Add to dashboard Cite

Therapeutic strategies to correct an excessive immune response to pathogenic infection is investigated as an optimal control problem. The control problem is formulated around a four dimensional mathematical model describing the inflammatory response to a pathogenic insult with two therapeutic control inputs which have either a direct pro- or anti-inflammatory effect in the given system. We use Pontryagin's maximum principle and discuss necessary optimality conditions. We consider both an L type objective functional as well as an L type objective. For the former, the presence of singular control will be addressed. For each case, numerical simulations using a nonlinear programming optimization solver to acquire different drug treatment strategies are presented and discussed. The results provide insight for possible treatment strategies and the methods could be a relevant tool for future practice to assist in better prediction of clinical outcomes and subsequently better treatment for patients.

show abstract

Computational Optimal Control

Cited by 32 publications

References 0 publications

Optimal control of suspended sediment distribution model of Talaga lake

Optimal control of suspended sediment distribution model of Talaga lake

Formulasi Sediaan Krim Tabir Surya dari Ekstrak Etanol Buah Bisbul (Diospyros blancoi)

Immune therapeutic strategies using optimal controls with L 1 and L 2 type objectives

Contact Info

Product

Resources

About