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International Journal of Science and Engineering (IJSE)
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
The scope of journal covers all area in the application on chemical, physical, mathematical, biological, agricultural, corrossion, and computer science to solve the engineering problems.
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Articles 15 Documents
Search results for , issue " Vol 4, No 2 (2013)" : 15 Documents clear
Development of Navigation Control Algorithm for AGV Using D* search Algorithm Geun Kim, Jeong; Hwan Kim, Dae; Kwun Jeong, Sang; Kyeong Kim, Hak; Bong Kim, Sang
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (524.588 KB) | DOI: 10.12777/ijse.v4i2.4310

Abstract

In this paper, we present a navigation control algorithm for Automatic Guided Vehicles (AGV) that move in industrial environments including static and moving obstacles using D* algorithm. This algorithm has ability to get paths planning in unknown, partially known and changing environments efficiently. To apply the D* search algorithm, the grid map represent the known environment is generated. By using the laser scanner LMS-151 and laser navigation sensor NAV-200, the grid map is updated according to the changing of environment and obstacles. When the AGV finds some new map information such as new unknown obstacles, it adds the information to its map and re-plans a new shortest path from its current coordinates to the given goal coordinates. It repeats the process until it reaches the goal coordinates. This algorithm is verified through simulation and experiment. The simulation and experimental results show that the algorithm can be used to move the AGV successfully to reach the goal position while it avoids unknown moving and static obstacles. [Keywords— navigation control algorithm; Automatic Guided Vehicles (AGV); D* search algorithm]
Sensorless Vector Control of AC Induction Motor Using Sliding-Mode Observer Thinh Doan, Phuc; Tien Nguyen, Tan; Kwun Jeong, Sang; June Oh, Sea; Bong Kim, Sang
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1587.613 KB) | DOI: 10.12777/ijse.v4i2.4311

Abstract

This paper develops a sensorless vector controlled method for AC induction motor using sliding-mode observer. For developing the control algorithm, modeling of AC induction motor is presented. After that, a sliding mode observer is proposed to estimate the motor speed, the rotor flux, the angular position of the rotor flux and the motor torque from monitored stator voltages and currents. The use of the nonlinear sliding mode observer provides very good performance for both low and high speed motor operation. Furthermore, the proposed system is robust in motor losses and load variations. The convergence of the proposed observer is obtained using the Lyapunov theory. Hardware and software for simulation and experiment of the AC induction motor drive are introduced. The hardware consists of a 1.5kw AC induction motor connected in series with a torque sensor and a powder brake. A controller is developed based on DSP TMS320F28355. The simulation and experimental results illustrate that fast torque and speed response with small torque ripples can be achieved. The proposed control scheme is suitable to the application fields that require high performance of torque response such as electric vehicles. doi:http://dx.doi.org/10.12777/ijse.4.2.2013.39-43 [How to cite this article: Doan, P. T., Nguyen, T. T., Jeong, S. K., Oh, S. J., & Kim, S. B. (2013). Sensorless Vector Control of AC Induction Motor Using Sliding-Mode Observer. INTERNATIONAL JOURNAL OF SCIENCE AND ENGINEERING, 4(2), 39-43; doi: http://dx.doi.org/10.12777/ijse.4.2.2013.39-43]
A Novel Approach to Communicate Secret Message between Users Using Sponge Function Technique on NTRU Varaprasad, S.; Rao, K.Venkata; Avadhani, P.S.
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.394 KB) | DOI: 10.12777/ijse.v4i2.4475

Abstract

This paper presents a novel approach for a (key distribution) for secret message communication among a group (G). In order to increase security to distribute secret message (key), we introduce sponge functions using these at a specific permutation. We generate a key and distribute this key using (PKCS)(public key crypto systems), the absorbing, squeezing functions are used. In this paper an introduction part which briefs regarding sponge functions, key distribution centre, group communication and NTRU, key generation authentication, in literature review we describe about the research states of sponge functions, lightweight hash functions-KDC – NTRU. In proposed work we propose how the group communication establishes registration of users, entry and exit of a user. The encryption and decryption algorithm are used between sender and receiver. The entire proposed work is verified in VHDL and ‘MATLABS’. doi: http://dx.doi.org/10.12777/ijse.4.2.2013.44-51 [How to cite this article: Varaprasad, S., Rao, K. V., & Avadhani, P. S. (2013). A Novel Approach to Communicate Secret Message between Users Using Sponge Function Technique on NTRU. INTERNATIONAL JOURNAL OF SCIENCE AND ENGINEERING, 4(2), 44-51; doi: http://dx.doi.org/10.12777/ijse.4.2.2013.44-51]
Performance of indigenous chicken under intensive rearing with various litter materials Sulistyoningsih, M.; Sunarti, Dwi; Suprijatna, Ejeng; Isroli, I.
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.849 KB) | DOI: 10.12777/ijse.v4i2.4505

Abstract

The purpose of the research was to  obtain  information regarding the performance of indigenous chicken  under   intensive  rearing. The  performance criteria were the increasing body abdominal weight, fat, rectal temperature, and the indigenous chicken’s mortality within the 5-week starter phase treatment. Research was conducted using 108 Day Old Chick (DOC). Data variance was analysed  based  on  the  split  plot  design  (3  types  of cage  litter  materials,  5 weeks  of data collection,  and   4   replications)   for   weight   gain   and   abdominal   fat parameters,   and completely  randomized  design  in  time  for rectal temperature. The result indicated a significant  effect  of  different  litter  materials  towards  weight  gain  (P  <0.01), the  highest body weight  was found on  chicken treated with rice straw litter; there was  no effect  of litter material on abdominal fat percentage; there was a significant effect (P < 0.01) of age towards rectal temperature; and there were no  interactions  between litter material with age,  on body weight  gain,  abdominal  fat,  and  rectal  temperature.  Chickens  under intensive  rearing  in rice straw floored cages were proven to have a mortality rate reduced by 3.7% in the starter phase.doi: http://dx.doi.org/10.12777/ijse.4.2.2013.52-56 [How to cite this article: Sulistyoningsih, M., Sunarti, D., Suprijatna, E., & Isroli, I. (2013). Performance of indigenous chicken under intensive rearing with various litter materials. INTERNATIONAL JOURNAL OF SCIENCE AND ENGINEERING, 4(2), 52-56; doi: http://dx.doi.org/10.12777/ijse.4.2.2013.52-56
The effect of geometric structure on stiffness and damping factor of wood applicable to machine tool structure Adi Widyanto, Susilo; Widodo, Achmad; Nugroho, Sri; Siahaan, David
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.337 KB) | DOI: 10.12777/ijse.v4i2.4511

Abstract

Stiffness and vibration damping capability are important criteria in design of machine tool structure. In other sides, the weight of machine tool structure must be reduced to increase  the handling capability. This paper presents  an analysis of the effect of geometric structure on stiffness and vibration damping of wood structure.  The stiffness was analysed  using numerical method, so called finite element method (FEM), while the vibration damping capability was experimentally tested. Vibration testing was also performed to wood structures with sand powder filled  into  its rectangular hole to observe the its effect on damping factor. Simulation results show  that the cross ribs structure yielded minimum mass reduction ratio compared to the three square holes as well as the single rectangular hole structures. While the vibration test results explained that the damping factor of Shorea laevis wood was higher than that Hevea braziiensis wood. The use of sand powder as vibrating  mass in closed-box structure effectively increased the damping capability, for single rectangular hole structure the damping factor was increased from 0.048 to 0.079doi: http://dx.doi.org/10.12777/ijse.4.2.2013.57-60[How to cite the article: Widyanto, S. A., Widodo, A., Nugroho, S., & Siahaan, D. (2013). The effect of geometric structure on stiffness and damping factor of wood applicable to machine tool structure. INTERNATIONAL JOURNAL OF SCIENCE AND ENGINEERING, 4(2), 57-60. doi: http://dx.doi.org/10.12777/ijse.4.2.2013.57-60]
Physical Characteristics of Pressed Complete Feed for Dairy Cattle Munasik, M.; Sutrisno, C. Imam; Anwar, Syaiful; Prayitno, Caribu Hadi
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.423 KB) | DOI: 10.12777/ijse.v4i2.4566

Abstract

The study was aimed to evaluate the physical characteristics of the pressed complete feed in the forms of cube, cylinder and ball. The study was conducted to get a complete feed of dairy cows that can be developed commercially. The evaluation was done on a physical test : bulkiness, hardness and hygroscopic properties of pressed complete feeds.  The results of this research showed that the bulkiness of pressed complete feed in the forms cubes, cylinders and balls were between 0.20 up to 0.48 liter/kg; the hardness of pressed complete feed, cylinders and balls were 3 lbs up to 14 lbs; the hygroscopic factor of pressed complete feed in the forms cubes, cylinders and balls were around 1.10% up to 9.69%. The pressed complete feed in the forms of cube and cylinder are better than  the form of ball in physical characteristics.doi: 10.12777/ijse.4.2.2013.61-65
Result of Six Local Upland Rice Cultivars of East Kalimantan at Different Plant Spacing Rusdiansyah, R.; Ismi Intara, Yazid; Indra Setiawan, Budi
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.367 KB) | DOI: 10.12777/ijse.v4i2.4582

Abstract

The objective of this research was to evaluate the response of six upland rice cultivars from East Kalimantan over different plant spacing. The experiment was conducted at Kutai Kartanegara district in East Kalimantan, Indonesia. The experimental design used was the factorial experiment in Randomized Completely Block Design (RCDB) with three replications. The first factor was six upland rice cultivars of East Kalimantan, i.e.: v1 (Mayas Pancing), v2 (Gedagai), v3 (Bogor Putih), v4 (Mayas Putih), v5 (Serai) and v6 (Kunyit). The second factor was plant spacing i.e.: j1 (20 x 20 cm) and j2 (30 x 30 cm). The results showed that among the six cultivars, Gedagai, Bogor Putih and Kunyit produced higher yield than other varieties.  Gedagai and Bogor Putih cultivars produced higher yield of 2.99 ton ha-1 at plant spacing 20 x 20 cm, whereas Kunyit produced higher yield of 2.66 ton ha-1 at plant spacing 30 x 30 cm. The agronomic characters showed that plant height of the six cultivars differed significantly at harvest time. In addition, highly significant differences of harvest time were observed of the six cultivars.Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.66-68
Physical and Mechanical Properties of Palm Oil Frond and Stem Bunch for Developing Pruner and Harvester Machinery Design Ismi Intara, Yazid; Mayulu, Hamdi; Radite, P.A.S.
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1937.392 KB) | DOI: 10.12777/ijse.v4i2.4583

Abstract

A development of oil palm pruner and harvester machinery design implemented in the field still faces a problem due to the lack of effective and efficient design which is need to be solved. It was noted that in order to develop the design, an early data and information of physical and mechanical properties of palm oil frond and stem fruits is critically important. The objective of the research was to obtain the physical and mechanical properties of palm oil frond and stem in order to develop the design of pruner and harvester machinery. The result showed that tool machinery was been advantageous by the physical properties of the plant i.e. the total weight of frond and leaf which enable to support the cutting process. The average of total weight of frond and leaf was 16.8 kg. The diagonal cutting trajectory was been more advantageous because of total weight and frond shape toward to the different of the plant tissue area. The measurement result shows that cutting curve follows the time required for cutting. The comparison among cutting curve shows differences in cutting thickness or length. In this case, the thickness is linear with cutting time. Besides, those curves show differences at the height which determine the maximum value of tested material cutting resistance. Alternative solution for machinery development design is pruner-harvester for height plant below 6 m and among 6 to 12 m. For below 6 m, pruner-harvester was designed by incorporating motor as power source and cutter-disc as the knife cutter. That condition was relied on that estate which was maintenance intensively commonly used cutter-disc. Pruner-harvester above 6 m and up to 12 m was improved based on manual egrek-designed by adding fresh fruit bunch alley supply glide in order to keep the fruits still in intact form. The consideration was based on affectivity and efficiency. It also considers homogenous ecological of palm oil plant which should be maintained to reduce global warming effect. Information obtained in this research could become positive consideration and alternative solution to provide problem solvingat early development design of palm oil pruner and harvester machinery.Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.69-74[How to cite this article: Intara, Y.I., Mayulu, H., and Radite, P.A.S. (2013). Physical and Mechanical Properties of Palm Oil Frond and Stem Bunch for Developing Pruner and Harvester Machinery Design. International Journal of Science and Engineering, 4(2),69-74. Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.69-74]
The Effects of Different Energy and Protein Ratio to Sheep’s Nutrient Intake and Digestibility Mawati, Sri; Soedarsono, S.; Sunarso, S.; Purnomoadi, Agung
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (206.953 KB) | DOI: 10.12777/ijse.v4i2.4584

Abstract

The objective of this research was to study the effects of different energy and protein ratio towards sheep’s nutrient intake and digestibility. Twenty four male sheep’s, 6 – 7 months old with initial average live weight 13+1.56 kg, coefficient variant11.78%) were used in this research. The complete feed ration which consisted of King Grass (Pennisetum purpureum), soybean powder, rice bran, dried cassava and molasses was used in this research. Protein content on each component was 10, 12 and 14% and total digestible nutrients (TDN) 60 and 65%, respectively. Dry matter (DM) and organic matter (OM) intake, DM and OM digestibility were studied in this research. Analysis of variance (ANOVA) was employed to analyze the data. Test of Small Difference (P<0.05) was then carried out if significant different occurred. The research results showed that Dry matter and OM ration intake showed significant different among treatments (P<0.05). The highest DM intake was obtained at crude protein (CP) 14% and TDN 65% i.e. 695.54 g while the lowest value was CP 14% and TDN 65% i.e. 462.11 g. Thus different DM and OM intake were caused by different ration ingredients composition. Dry matter and OM ration digestibility were not show different (P>0.05) among crude protein and TDN treatments. Different energy and protein ration treatments caused different DM and OM intake but were not cause different in DM and OM digestibility. Based on the research results, a study on the effects of different ration’s energy and protein ratio towards N efficiency should be conducted in order to increase cattle productivity. Doi: http://dx.doi.org/10.12777/ijse.4.2.75-79 [How to cite this article: Mawati, S., Soedarsono, S., Sunarso, S. & Purnomoadi, A. (2013). The Effects of Different Energy and Ratio to Sheep’s Nutrient Intake and Digestibility. International Journal of Science and Engineering, 4(2),76-79. Doi: http://dx.doi.org/10.12777/ijse.4.2.75-79]
Evaluation on Biofilter in Recirculating Integrated Multi-Trophic Aquaculture Sumoharjo, S.; Maidie, Asfie
International Journal of Science and Engineering (IJSE) Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (769.392 KB) | DOI: 10.12777/ijse.v4i2.4593

Abstract

Integrated multi-trophic aquaculture pays more attention as a bio-integrated food production system that serves as a model of sustainable aquaculture, minimizes waste discharge, increases diversity and yields multiple products. The objectives of this research were to analyze the efficiency of total ammonia nitrogen biofiltration and its effect on carrying capacity of fish rearing units. Pilot-scale bioreactor was designed with eight run-raceways (two meters of each) that assembled in series. Race 1-3 were used to stock silky worm (Tubifex sp) as detrivorous converter, then race 4-8 were used to plant three species of leaf-vegetable as photoautotrophic converters, i.e; spinach (Ipomoea reptana), green mustard (Brassica juncea) and basil (Ocimum basilicum). The three plants were placed in randomized block design based on water flow direction. Mass balance of nutrient analysis, was applied to figure out the efficiency of bio-filtration and its effect on carrying capacity of rearing units. The result of the experiment showed that 86.5 % of total ammonia nitrogen removal was achieved in 32 days of culturing period. This efficiency able to support the carrying capacity of the fish tank up to 25.95 kg/lpm with maximum density was 62.69 kg/m3 of fish biomass productionDoi: http://dx.doi.org/10.12777/ijse.4.2.2013.80-85 [How to cite this article: Sumoharjo, S.  and Maidie, A. (2013). Evaluation on Biofilter in Recirculating Integrated Multi-Trophic Aquaculture.  International Journal of  Science and Engineering, 4(2),80-85. Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.80-85]

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