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Lilik Sutiarso

Jurusan Teknik Pertanian, Fakultas Teknologi Pertanian, Universtas Gadjah Mada, Yogyakarta

Author-ID : 2871066

Agriculture, Biological Sciences & Forestry

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Articles

Model Dinamika Ketersedian Pangan - Studi Kasus : Ketersediaan Beras di Wilayah Madiun, Jawa Timur Tri Purwadi; Lilik Sutiarso; Putu Sudira
agriTECH Vol 23, No 1 (2003)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

In order to predict and determine level of food security in a certain area, a dynamic system approach model of food supply-demand planning that based on regional resources was developed. The model was run using both primary and secondary data, which were gathered in the study area, Madiun Region, East Java Province. One of food crop comodities that was focused for simulating the model was rice. To validate the developed model, one scenario was selected, there were no changing of planting or harvesting area and rice productivity level, also rice imported from other areas (countries) was zero for five next years. The simulation results indicated that the level of actual food security (1.29 - 1.27 years) was higher than government's level (1.25 years), though the rice market price decreased gradually.

Desain Sistem Kontrol Umpan Balik pada Lintasan Traktor Tanpa Operator Lilik Sutiarso; T. Takigawa
agriTECH Vol 22, No 4 (2002)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

In the terms of precision farming system, this research was carried out in order to develop a trajectory path control method for the autonomous tractor when approaching a target. Firstly, open loop control was considered to design a trajectory control algorithm directly, definitely and simply structure. A proposed trajectory control algorithm called parallel parking theory was developed as non-linear state equation within non-holonomic constraint. To stabilize non-linear controlled, the algorithm was derived using the state feedback linerization technique. The vehicle posture can be expressed into position, direction angle and steering angle. In a front-wheel steering vehicle, two controlling inputs, running speed and steering vehicle, two controlling inputs, running speed and steering angle. Due to the running speed is difficult to control accurately, thus only the steering angle was controlled. In order to achieve the research objective, research work was carried out to compare the performance developed control algorithm between feedback and open-loop control system. A twenty-nine Ps computer-controlled tractor with four-wheel steering and four-wheel drive was used in this research ecperiment. For local based positioning method, fan beam laser sensor,fiber optic gyro sensor and incremental type rotary encoder were installed properly on the vehicle. The experimental results showed that after modifying of the developed algorithm into a feedback control form by correcting vehicle direction angle and lateral moving distance had improved its accuracy varied up to about 95%.

An Information Support System for Identifying Farming System Part I : Development of A Computer Program Package Lilik Sutiarso
agriTECH Vol 22, No 1 (2002)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

This study was undertaken to develop a computer program package for identifying a farming system that was focused in the water availability analysis, the optimizing of agricultural power and selected equipment and the senditivity analysis. The computer programs for all models were developed and written in FoxBASE command language. Three databases were obtained from the farm survey i.e.; climate, crop and power. All these databases can be appended, edited, deleted or displayed by the users through a menu of database mahagement system (DBMS). They were used to evaluate the utility of the computer programs as input data. The infromation system calculates the amoun of monthly water surplus and deficit, the optimum number of agricultural power (animal or power tiller) and its matching implement required and also change in the net return of crop production system due to the change of input variables such as crop price, yield, and production material cost. The system output for each analysis can be presented in three options by screen, printer and file that can be accessed to another language.

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