THE IMPACT OF STRATEGIC PURCHASING TO THE SUPPLIER INVOLVEMENT THROUGH COMMUNICATION, COORDINATION AND COLLABORATION IN SMAAL AND MEDIUM ENTERPRISES

In recent times, the theory of purchasing and supply operations has been widely studied under a variety of labels and for a number of reasons. Realizing competitive advantage from organizational alignment and relation to materials supply is for a form of backward integration. In the process, the manufacturing organization obeys demands from distributors; purchasing is in turn re-structured and managed to achieve improved customer value for manufacturing; thereafter, the process addresses the suppliers to the organization (external integration) typically involving supplier rationalization and the introduction of supplier evaluation systems. Based on previous research, there was finding that strategic purchasing has been impact to communication, coordination and collaboration with supplier which is increase supplier involvement. According to a survey 100 respondent which was conducted by means questionnaires and 94 completed questionnaires were returned. Six responses were considered incomplete and had to be discarded, and this left 86 valid responses. This study result are strategic purchasing has a positive significant effect to communication is 0.314; positive significant effect to coordination is 0.336; and positive significant effect collaboration is 0.365. Communication and Collaboration directly will bring significant contribution to supplier involvement, but coordination is not directly. Key words: Strategic purchasing, communication, collaboration, coordination, supplier involvement

Uji Efektifitas Beauveria Basianna Dan Bacillus Thuringiensis Terhadap Ulat Api (Setothosea Asigna Eeck, Lepidoptera, Limacodidae) Di Laboratorium

Palm oil tree is the most productif than the other nabaty oil plant. Setothosea is the primaryleaf eaten on palm oil tree. Test Effectiveness of Bacillus thuringiensis and Beauveriabasianna Caterpillars Against Fire Setothosea asigna Eecke in laboratory. The research wasconducted at the Laboratory of Plant Pests Faculty of Agriculture, University of NorthSumatra, Medan with altitude ± 32 meters above sea level. The research method used is nonCompletely Randomized Design factorial. The parameters in the observed percentagemortality of larvae of the caterpillar is Setothosea asigna fire. The results show thepercentage of mortality of silkworm larvae using Beauveria basianna flames were highest intreatment by 100% I3 is the observation of the IV, percentage mortality of silkworm larvaeusing Bacillus thuringiensis flames were highest in I6 treatment was 100% in the observationof the IV

OPTIMALISASI MESIN BUBUT

Optimizationturning machineis performed to maximize every machining on the turning machine, so that the machine can work optimally. Turning machine optimization process includes several stages, First, check all components of the turning machine is normal and there is no damage, secondly, the process of replacing a component on the turning machine that is broken between the worm gear, nortonbox shaft, and tapered pin. Then, testing the workpiece according to operating procedures. The results obtained from testing the turning machine is cutting force 29,36 N, power of cut 8,8 Watt, and the effective turning time is 1,21minute.The tangential force smaller than the received force during operation, is still in safe condition. Keywords: optimization, tangential force, power of cut, cutting force Optimalisasi mesin bubut dilakukan untuk memaksimalkan setiap proses permesinan pada mesin bubut agar mesin dapat bekerja secara optimal. Proses optimalisasi mesin bubut meliputi beberapa tahapan, yaitu : pertama mengecek semua komponen dari mesin bubut apakah normal dan tidak ada kerusakan, kedua, proses penggantian komponen pada mesin bubut yang rusak di antaranya, roda gigi cacing. Kemudian dilakukan pengujian pada benda kerja sesuai prosedur pengoperasian. Hasil yang diperoleh dari pengujian mesin bubut yaitu gaya potong 29,36 N, daya pemotongan 8,8 Watt, serta waktu pembubutan efektif 1,21 menit. Dengan gaya tangensial lebih kecil saat beroperasi dibanding gaya yang mampu diterima. Kata kunci : optimalisasi, gaya tangensial, daya pemotongan, gaya poton

Simulation and feasibility studies of rooftop PV system for university campus buildings in Surabaya, Indonesia

Present work simulates and analyzes the rooftop photovoltaic (PV) system on buildings roofs of the University of Surabaya, Indonesia for electricity power generation. The work also to calculate greenhouse gas (GHG) emission reduction that can be obtained by PV system mounted on the building roofs. The surface area of the roofs was determined using Polygon feature of Google Earth TM. The energy output of the system was simulated with SolarGIS pvPlanner software program. The grid-connected PV system type was chosen in the simulation. Greenhouse gas (GHG) emission reduction analysis was carried out using RETScreen program simulation. It was found that about 10,353 m2 of the rooftop of the university buildings could be used for panel installation. The total capacity of the panels is found about 2,070 kWp with total electricity production is about 3,180 MWh per year and could supply up to 80% of the campus energy demand. The system would serve as a means of reducing 3,367.6; 2,477.2, or 1,195.7 tons of CO2 to the atmosphere in comparison to the same amount of electricity produced by burning coal, oil, or natural gas respectively. The unit cost of PV electricity was found ranging from 0.10 - 0.20 USD/kWh. From economic aspects, the rooftops PV system has the potential to provide power at a competitive cost in comparison to other alternative options of power generation. © 2018, International Journal of Renewable Energy Research

Performance test of a grid-tied PV system to power a split air conditioner system in Surabaya

Air conditioner for cooling air is one of the major needs for those who live in hot climate area such as Indonesia. This work presents the performance test of a grid-tied PV system to power air conditioner under a hot tropical climate in Surabaya, Indonesia. A 800 WP grid-tied photovoltaic (PV) system was used, and its performance was tested to power a 0.5 pk of split air conditioner system. It was found that about 3.5 kWh daily energy was consumed by the tested air conditioner system, and about 80% it could be supplied from the PV system. While the other 20% was supplied by the grid during periods of low solar irradiation, 440 Wh of energy was fed into the grid during operation out of office hours. By using the grid-tied PV system, the energy production by PV system did not need to match the consumption of the air conditioner. However, a larger capacity of PV system would mean that a higher percentage of the load would be covered by PV system

Study of Solar Electricity Powered Air Conditioner in a Tropical Hot Climate

Air conditioners are becoming more common and are a major strain on energy demands in tropical climate where air conditioning is used all year round. This work studied of using solar electricity produced by photovoltaic (PV) system to power air conditioners in Surabaya, Indonesia. Measurement tests were conducted on different photovoltaic systems. A grid connect system provides a better solution with the 800 W PV system providing 80 % of the 3.5 kWh load of the air conditioner, while the other 20 % coming from the grid during periods of low irradiation. With the grid-connected system, the PV panel's production does not need to match the consumption of the air conditioner, although a smaller PV array will mean a smaller percentage of the load will be covered by P

Mathematical modeling and simulation of a solar agricultural dryer with back-up biomass burner and thermal storage

Solar drying is a cost-effective and environmentally friendly method for drying agricultural products. To design a proper solar dryer for specific products, thermodynamic relations for the dryer system need to be considered. Numerical simulations are commonly used for the design and operational control of dryers. This study presents the mathematical modeling and simulation of a solar agricultural dryer with back-up biomass burner and thermal storage. Thermodynamic and numerical simulations of the solar collector and drying chamber are performed, while back-up heater (biomass burner) operation is simulated with a computational fluid dynamics (CFD) simulation. For the solar collector, it was found that the presence of a glass cover significantly increases the temperature of the collector; however, increasing the number of glass covers from one to two does not significantly affect the temperature. Variation in thickness of the back insulation has negligible effects, especially for thicknesses over 3 cm. The results show that there is a small difference in temperature between the bottom three trays, while the temperature on the top tray is significantly higher. The CFD simulation showed that the average drying air temperature in the drying chamber was 56 °C, which is suitable for the drying of agricultural products

The Impact of Employee Satisfaction on Profitability of Restaurants And Cafés: A Research in Surabaya, Indonesia

Currently the business sector of restaurants and cafés in Surabaya has been developing rapidly. In a relatively short time, many restaurants and cafés appear with unique and various offers. Restaurant and café are businesses that emphasize not only on the food served, but also on the service delivery of the employees. In other words, the business of restaurants and cafés not only sell the product but also sell the service. In this research, the data collection is done by distributing questionnaires to 794 employees and customers in 55 restaurants and cafés in Surabaya which adopt the table service concept. The Partial Least Square for Multivariate Analysis is employed for processing the data