Search

PT. Naruna is a ceramics factory located in Salatiga, Indonesia. In PT. Naruna ceramics, all products are handmade with contemporary designs and have a high artistic value in shape and color. Getting profit is the company’s primary goal, but many companies still need to learn the maximum profit that can be obtained by optimizing their resources, one of which is PT. Naruna. PT. Naruna produces goods based on intuition. As a result, a lot of goods are piled up in warehouses. Meanwhile, with the development of the times, new trends and images will appear more attractive so that consumer tastes and motifs from ceramics will change. In addition, ceramic products that have gone through the combustion process cannot be recycled and must be burned. This research focuses on the production of glasses with three different types according to price. The aim of this paper is to optimize profits by determining the composition of the number of products produced. We used linear programming with a simplex method to solve our problem in PT. Naruna. Linear programming is the most appropriate method for solving problems that exist in PT. Naruna, namely by paying attention to the objective and constraint functions. The objective function is to maximize profit, so it takes the form of a linear equation with the variable X1 being the first type of glass, X2 being the second type of glass, and X3 being the third type of glass. The constraint functions used include the number of products, the number of workers, the amount of clay, and the time for production. The results show that PT. Naruna can achieve maximum profit when producing glass type 1 less than type 3 less than type 2.

The selling value of coffee depends on the level of maturity of the beans. The coffee plantation in Alam Indah village, Bandung district covers an area of 84 hectares or approximately 840,000 square meters, making it difficult for farmers to monitor the condition of each coffee plant individually. The objective of this paper is to provide a path planning using the bee colony algorithm to find the best routes for a coffee plantation. There are several monitoring techniques for coffee, one of which is using a drone equipped with image processing. In this research, path planning was carried out to determine the fastest route that a drone can take using the bee colony algorithm. The path planning was divided into two areas that have been adjusted to the operational capabilities of the DJI Phantom 4 drone type. The determination of the best route was carried out based on the neighborhood principle using the calculation of the highest fitness value. Each iteration entered the employed bee phase, onlooker bee phase, and scout bee phase. The result shows that there are 24 blocks that need to be passed through. Area 1 can be covered in 18.4 minutes and area 2 in 13.4 minutes at a speed of 30 km/h and a drone altitude of 10 meters. The fastest route in area 1 passes through blocks A-B-C-D-E-F-M-N-O-P-Q-L-K-G, while in area 2, the fastest route passes through blocks I-J-R-T-U-X-W-V-S-H. [ABSTRACT FROM AUTHOR]

A helicopter is widely used in forestry disease and pest control. An application tank of helicopter is taken as a loading container of the liquid medicine. It is very necessary for the reasonable anti-shaking structure inside the helicopter medicine tank for the aviation operation stability and energy consumption. In this study, the structural design was optimized to place an anti-shaking grid structure in the inner chamber of the tank, in order to reduce the stability of the helicopter that caused by the shaking of the liquid during operation. Numerical simulations were carried out on the Fluent's Volume of Fluid (VOF) with the Realizable turbulence models. Evaluation indicators were selected as the variation of the free liquid surface waveform and the pressure magnitude at the internal reference point for the variable speed excitation of the pillbox. The maximum flow velocity of liquid was then determined to simulate the liquid sloshing in the empty tank along the excitation direction. The position of the damping grid structure was also determined, according to the formula of energy dissipation of liquid sloshing around the flow resistance. The simulation results show that the maximum pressure at the reference point increased with the increase of the height of the grid. But the time to reach the maximum pressure was similar. Specifically, the liquid slosh frequency was lower at the grid height of 100 mm. The pressure value was smaller at the reference point with the grids number of 9, and then tended to be relatively stable, as the number of grids increased gradually. A medicine tank shaking test bench was constructed to simulate the flight conditions of helicopter operation, in order to verify the anti-shaking effect. The test results showed that the greater the acceleration was, the greater the maximum impact force on the inner wall of the powder cabinet was, and the earlier the maximum impact force time was. The greater the liquid filling rate was, the greater the maximum impact force on the inner wall of the cabinet was. The maximum pressure increased by 27.7% at the liquid filling rate of 0.8, compared with the liquid filling rate of 0.6. There was the consistent shape trend of the free liquid surface under different liquid filling rates. But the time of violent shaking was advanced with the increase of liquid filling rate. At the same time, the tank with the higher liquid filling rate was not susceptible to the secondary impact of the liquid after excitation. Furthermore, the time decreased for the liquid level to stabilize with the gradual increase of the forward tilt angle of the medicine tank under different working conditions. Once the forward tilt angle of the medicine tank changed from 0° to 10°, the time decreased by 44.6% for the liquid level to stabilize. It was the much longer to stabilize, when the medicine tank was tilted, the side of which the lower liquid level was wobbled more violently. A vertical damping grid structure was obtained with a height of 100 mm and a number of 9 grids after optimization of numerical simulation. A comparison of the simulation and test showed that the anti-shaking damping grid structure was effectively reduce the slosh amplitude of the liquid inside the cabinet after excitation. The time was reduced by 54.8% than before from the beginning of sloshing to the liquid level of the empty tank, indicating the better inhibition effect. The experimental design and the reasonable grid structure can provide a strong reference for the subsequent research on the anti-sloshing structure inside the tank of a helicopter. [ABSTRACT FROM AUTHOR]

Ethanolic extract of Hibiscus rosa-sinensis L leaves has in vitro mucolytic activity which at 0.75% has in vitro mucolytic activity equivalent to 0.1% acetylcysteine. However, the extract has a bitter taste and low acceptability. Therefore, Hibiscus leaf extract is formulated in the form of syrup by optimizing the excipient. In this research, the optimized excipients were sorbitol, glycerin, and xanthan gum since those excipients have roles to improve the acceptability of syrup by using the Mixture Design (D-Optimal) method. The properties of physical syrup that were evaluated included acidity (pH), viscosity, ease of pouring, and taste. The difference between the optimum formula prediction from software and the physical characteristics syrup experimental results were continued using a onesample of t-test with a confidence level of 95%. The mucolytic effectiveness of optimal syrup was tested and compared to the positive control (0.1% acetylcysteine syrup). The D-Optimal Mixture Design had a desirability value of 0.84, with the optimal percentage of excipients being 34.57% of sorbitol solution, 15.53% of glycerin, and xanthan gum with 0.10%. The results pH, viscosity, ease of pouring, and taste of optimum syrup showed no significant difference (sig > 0.05) between the experimental results and the predictions Design Expert® software version 7.1.5. It is confirmed the validation of the software used for the experiment. The optimum syrup of ethanolic extract of Hibiscus rosa-sinensis L. leaves has mucolytic activity equivalent to acetylcysteine syrup at 0.1%. [ABSTRACT FROM AUTHOR]

Chalcone is flavonoids class that have activity as sunscreen. The objective of this research is to find out the optimum formula of chalcone lotion, physical properties and stability of optimum formula lotion o/w, and sunscreen activity by spectrofotometry.         The optimum formula was obtained by Simplex Lattice Design (SLD) method using Design Expert® version 10. To determine the optimum formula used three responses, namely viscosity, spreading, and adhessiveness. The physical properties of the lotion o/w were carried out including spreading test, adhessiveness test, and viscosity. The physical stability test of lotion o/w was done by cycling test. The sunscreen lotion activity o/w is determined by spectrophotometry by determining SPF, %Erythema Transmission, and %Pigmentation Transmission. Data were analyzed by t-test and One Way ANOVA with 95% confidence level. The results showed that the optimum lotion formula was found in combination of 2.40% cetyl alcohol, 0.36% carbopol, and 5.74% glycerin. The optimum formula of chalcone lotion has a viscosity of 73.48 ± 6.18 dPas, adhesiveness of 7.14 ± 1.26 seconds, and a spreading power of 24.99 ± 1.11 cm2. The results of statistical analysis showed that the lotion has a pretty good stability. Lotion has activity as sunscreen at concentration of chalcone in lotion 0,05% with SPF 36,927 and can provide protection against erythema and pigmentation.

One of the parameters to be tested on the sphygmomanometer is the deflection of the dial. The testing method based on the standard uses manual air pressure to increase the pressure so that the dial is pointed to the desired pressure. This paper proposed an automatic testing method using a proportional-integral-derivative (PID) controller based on arduino to control the pressure. The result shows that the system is not suitable to use. The process capability index at each given setpoint is less than 1. This low cost proposed testing method still needs to be improved and could become an alternative solution for laboratory testing of the sphygmomanometer. [ABSTRACT FROM AUTHOR]

Farmer households generally operate food crops and livestock subsectors that have not fully implemented well, so an optimal farming has not been achieved. This study aimed to analyze optimation of cow-calf beef cattle and paddy farming integration and simulation changing in input prices and the usage of resources to the optimal model. Survey method was used in the research in Grobogan Regency by determining Wirosari District and Purwodadi District. Quota sampling method is used to determine the number of respondents without counting the population as a sampling frame. The number of respondents in each district was 40 farmers so the total respondent was 80 farmers. Data were analyzed using linear programing. Results showed that optimum conditions of integration were achieved in 0.45 ha land, 2.75 AU of cow-calf beef cattle with maximum income of IDR 52,112,440/year. The simulation results regarding in changing in input usege indicated that the addition of 0.25% land area gives a change in scale of cow-calf beef cattle by 0.018% and income of 14.78%. In conclusion, integration optimation was achieved on 0.4 5ha land, 2.75 UT cow-calf beef cattle and optimal solution simulations indicated that farmers have the ability to develop their farming.

Farmer households generally operate food crops and livestock subsectors that have not fully implemented well, so an optimal farming has not been achieved. This study aimed to analyze optimation of cow-calf beef cattle and paddy farming integration and simulation changing in input prices and the usage of resources to the optimal model. Survey method was used in the research in Grobogan Regency by determining Wirosari District and Purwodadi District. Quota sampling method is used to determine the number of respondents without counting the population as a sampling frame. The number of respondents in each district was 40 farmers so the total respondent was 80 farmers. Data were analyzed using linear programing. Results showed that optimum conditions of integration were achieved in 0.45 ha land, 2.75 AU of cow-calf beef cattle with maximum income of IDR 52,112,440/year. The simulation results regarding in changing in input usege indicated that the addition of 0.25% land area gives a change in scale of cow-calf beef cattle by 0.018% and income of 14.78%. In conclusion, integration optimation was achieved on 0.4 5ha land, 2.75 UT cow-calf beef cattle and optimal solution simulations indicated that farmers have the ability to develop their farming. [ABSTRACT FROM AUTHOR]

Emergency evacuation plan plays a key role for fire risk management and successful evacuation. In this work, a topological model of evacuation routes is established and the corresponding matrix function is also proposed in order to evaluate evacuation ability. Simultaneously, risk assessment of fire scenarios is made based on numerical simulation. And on this basis, the variation laws of risk indicators such as temperature, thermal radiation, the concentration of toxic gas are analyzed in details and dynamic risk assessment of evacuation routes is made. Introducing the concept of equivalent routes, the scheme of the best route for evacuee at each location is the one along with the shortest time and minimal risk and suggested based on the Dijkstra algorithm. And then, one case is presented and result indicates that this model can aid people to avoid crowdedness and evacuate as soon as possible under fire accident. The risk-based model is also useful for the evacuation planning. [ABSTRACT FROM AUTHOR]

USCPACK Software from University of Carolina is one of the pioneers of computerized drug dosage system. This software uses Bayesian method. The algorithm that used in this software is known as NPEM (Non Parametric Expectation Maximization). After knowing how USCPACK work, then we made new software that has the same use like USCPACK but with new algorithm that different from NPEM. These paper will describe the how to make the software based on NPAG algorithm. Abstract in Bahasa Indonesia: Software USCPACK buatan University of Carolina merupakan salah satu pelopor dimungkinkannya penentuan dosis obat persatuan waktu tertentu untuk pasien secara umum menggunakan komputer. Software ini bekerja dengan menggunakan metode dasar Bayesian. Algoritma yang digunakan oleh software ini adalah NPEM (Non Parametric Expectation Maximization). Setelah mengetahui cara kerja dari USCPACK maka dibuatlah sebuah software pendosisan obat menggunakan algoritma non parametrik lain selain NPEM. Paper ini akan membahas pembuatan software pendosisan obat menggunakan algoritma newton – raphson dalam penentuan dosis obat terkomputerisasi. Kata kunci: Pendosisan terkomputerisasi, optimasi, Bayesian, NPEM, Newton Raphson,USCPACK

The paper presents a solution, which enables widening of more objective diagnostics and examination of operating conditions of production systems by AWJ technology following their economic effectiveness and competitiveness with the use of modelling and simulation. It contains the base of more complex diagnostics and factors, on which it is built. It presents a suggestion of experiment set for more complex diagnostics and the suggestion of sets for its evaluation. It also mentions expected benefits of the realisation of more complex diagnostics of operating conditions. [ABSTRACT FROM AUTHOR]