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Wireless Disturbance Mapping and Path Selection for Placement of Network Control System Components

Journal of Physics: Conference Series 2019年第1期1230卷

作者： Endra Joelianto Muhammad Zhaka Ghazali Tutun Juhana Instrumentation and Control Research Group Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia. Engineering Physics Study Program Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia. Telecommunication Engineering School of Electrical and Informatics Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia.

Wireless transmitters in measurement instruments act for transmitting data or signals using radio frequency or currently better known as WIFI by means of 2.4 GHz. WIFI is a wireless local area network (WLAN) communication network. With the existence of telecommunications, measurement and control in industrial processes are heading to a high level of reliability compared to the conventional wired instruments in reaching hard locations or dangerous and hazardous areas. However, this cannot be done easily especially in maintaining the communication performances. Research is needed on the reliability of the wireless transmitter itself. Several factors such as communication disruptions are new challenges for the industry of wireless technology manufacturers to be able to prevent or to minimize errors that can arise in wireless network control systems. Signal strength mapping is needed in designing wireless network control systems. In this paper, the mapping is performed by measuring the signal strength parameters (Power Level) and the use of channels (Channel Usage) at planned locations. The measurement results are then used as sample points in the mapping. Data show that the signal strength measurement at each channel has a maximum of - 60 dBm and a minimum of -105 dBm. Mapping is performed by using two methods, namely Inverse Distance Weight (IDW) and Spline Interpolation (SI) methods. The paper proposes an algorithm to select the appropriate wireless communication paths from the planned locations. The mapping results indicate the appropriate area to place the transmitter and the receiver devices in a wireless data transmission network. With good placement, it is expected that measurements using wireless transmitters have minimum disruptions.

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Design of conveyor utilization monitoring system: a case study of powder coating line in sheet metal fabrication

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IOP Conference Series: Materials Science and engineering 2018年第1期319卷

作者： Hoedi Prasetyo Yohanes Sugiarto Cucuk Nur Rosyidi Master Study Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia and Mechatronics Department Politeknik ATMI Surakarta Surakarta 57145 Indonesia Mechatronics Department Politeknik ATMI Surakarta Surakarta 57145 Indonesia Master Study Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia

Conveyor is a very useful equipment to replace manpower in transporting the goods. It highly influences the productivity, production capacity utilization and eventually the production cost. This paper proposes a system to monitor the utilization of conveyor at a low cost through a case study at powder coating process line in a sheet metal fabrication. Preliminary observation was conducted to identify the problems. The monitoring system was then built and executed. The system consists of two sub systems. First is sub system for collecting and transmitting the required data and the second is sub system for displaying the data. The system utilizes sensors, wireless data transfer and windows-based application. The test results showed that the whole system works properly. By this system, the productivity and status of the conveyor can be monitored in real time. This research enriches the development of conveyor monitoring system especially for implementation in small and medium enterprises.

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The Need of Catering Food Materials using Lotting Technique

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IOP Conference Series: Materials Science and engineering 2018年第1期407卷

作者： J Robecca D Sudrajat Study Program of Industrial Engineering Faculty of Engineering and Computer Science Universitas Komputer Indonesia Jl. Dipatiukur no. 112-116 Bandung Indonesia

The purpose of this study is to minimize the purchase cost for each food from the catering menu. Therefore, raw material inventory control method is needed to plan arrival schedule, order schedule, and the amount of ordering of each foodstuff. The technique of determining the amount of ordering (lotting technique) used there are three, namely the least unit cost technique, the lot for lot technique and the least total cost technique. The results of this study indicate that the company can minimize the cost of purchasing food based on lead time, storage time limit, and optimal lotting techniques. Lead time is the period between the order to the delivery time, the storage time limit is how long the best time required for the quality of foodstuffs are maintained, while the lotting technique is the optimal size of order quantity. The lotting technique chosen for each type of food material is different. The cost of purchasing the food consists of the price of the foodstuff, the ordering fee for the type of material and the storage cost for the type of foodstuff. There are 16 types of foodstuffs with the cost of purchasing the smallest raw material with the lot for lot techniques. There are 29 types of foodstuffs with the cost of purchasing the smallest raw materials using the least unit cost techniques. And 10 types of foodstuffs with the least total cost technique as a lotting technique with the purchase of the smallest raw material. Of the 55 types of food raw materials, the company was able to save the cost of purchasing groceries of 33,006,371.75 IDR per month. Of course, in order to apply this planning, the company must provide facilities in order to extend the life of the foodstuff in accordance with predetermined lead time and to ensure the quality of the foodstuff is guaranteed.

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Initial sustainability assessment of tapioca starch production system in Lake Toba area

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IOP Conference Series: Materials Science and engineering 2018年第1期337卷

作者： Asido Situmorang Yosef Manik Engineering Management Study Program Faculty of Industrial Technology Institut Teknologi Del Laguboti 22381 North Sumatera Indonesia

This study aims to explore to what extent the principles of sustainability have been applied in a tapioca industry located in Lake Toba area and to explore the aspects that open the opportunities for system improvement. In conducting such assessment, we adopted the life-cycle approach using Mass Flow Analysis methods that covers all cassava starch production processes from fresh cassava root till dry cassava starch. The inventory data were collected from the company, in the form of both production record and interviews. From data analysis the authors were able to present a linked flow that describes the production process of tapioca starch that quantifies into the functional unit of one pack marketable tapioca starch weighs 50 kg. In order to produce 50 kg of tapioca, 200 kg cassava root and 800 kg of water are required. This production efficiency translates to 25% yield. This system generates 40 kg of cassava peel, 60 kg of pulp and 850 kg of waste water. For starch drying 208.8 MJ of thermal energy is required in the form of heating fuel. The material flow analysis is employed for impact assessment. Several options in improving the operation are proposed includes utilization of pulp into more valuable co-products, integration of waste treatment plant to enable the use of water recycled from the extraction operation for the washing process, and to application of a waste water treatment system that produces biogas as a renewable energy, which reduces the consumption of fuel in dryer unit.

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Inclusive business model in tapioca starch industry in Lake Toba area: a case study

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IOP Conference Series: Materials Science and engineering 2018年第1期337卷

作者： S Tampubolon Y Manik Engineering Management Study Program Faculty of Industrial Technology Institut Teknologi Del Laguboti 22381 North Sumatera Indonesia

The notion of inclusive business calls for additional focus and innovation in the way companies do business which seeks to contribute to poverty alleviation by including Bottom of the Pyramids (BoP) communities within its value chain while not losing sight of the ultimate goal of business. Lake Toba Area has potentials in providing chances for doing businesses. On the other hand, the growth of market size is rather slow and demographically still dominated by BoP. This is a case study which seeks to investigate to what extent the Inclusive Business Model (IBM) is adopted in the strategic planning and applied in the operational management of companies that operate in Lake Toba Area. The study was conducted in qualitative basis. The observation was conducted by gathering data and information through a series of interviews with the top management and desk study of the business plan in a tapioca starch industry in Toba Samosir Regency. The collected data and information were then analyzed qualitatively by comparing them with criteria and parameters of IBM suggested in a vast body of literature. The reference by which the IBM is referred in this study is a series of criteria which is synthesized from a literature review on a vast body of literature about IBM. From data analysis, it is evident that IBM has been incorporated in the strategic plan and applied in the operational activities of the object of this study. However, we also found some rooms for improvement such as expanding the involvement of BoP in their value chain as consumers, by which some innovation in the product diversification is required.

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Optimization of Frequency and Stirring Rate for Synthesis of Magnetite (Fe 3 O 4 ) Nanoparticles by Using Coprecipitation- Ultrasonic Irradiation Methods

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Procedia engineering 2017年 170卷 55-59页

作者： Retno Rahmawati Mohammad Gilang Permana Bill Harison Nugraha Brian Yuliarto Suyatman Deddy Kurniadi Engineering Physics Department Faculty of Industrial Technology ITB Bandung 40132 Indonesia Physics Study Program Faculty of Sains and Technology UIN SunanKalijaga Yogyakarta 55281 Indonesia

Magnetite (Fe 3 O 4 ) nanoparticles from iron sand as starting materials have been successfully synthesized by using coprecipitation- ultrasonicirradiation methods. This paper reports the preparation and optimization result of ultrasonic frequency and stirring rate during the synthesis process. The frequencies of ultrasonic conducted in this research are 300, 400 and 400 kHz. The stirring rates performed in the synthesis process are varied from 500 to 900 rpm. The qualitative analysis by using X-Ray Diffractometer (XRD) showed that the structure of Fe 3 O 4 nanoparticles have a same phase with ICCD No. 75-0449. Moreover, the quantitative analysis by using Debye-Scherer equation showed that the crystallite size of Fe 3 O 4 ranging from 21 to 25 nm depend on the ultrasonic frequency and stirring rate. Meanwhile, the transmission electron microscopy (TEM) result revealed that the Fe 3 O 4 tend to form spherical shape with little agglomeration on the morphology of the Fe 3 O 4 . The magnetic properties of Fe 3 O 4 were investigated by using vibrating sample magnetometer (VSM). The VSM measurement result showed that the Fe 3 O 4 have saturation magnetization (Ms), remanent magnetization (Mr) and coercivity field (Hc) at 25 emu/gram, 6,0562 emu/gram, and 0,0108 T, respectively. Based on the magnetic characterization, the Fe 3 O 4 nanoparticles have a potential to be appliedin biomedical field.

关键词： coprecipitation-irradiation ultrasonic Fe 3 O 4 iron sand optimization

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Preparation of cellulose nanocrystals from empty fruit bunch of palm oil by using phosphotungstic acid

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IOP Conference Series: Earth and Environmental Science 2018年第1期105卷

作者： Y W Budhi M Fakhrudin N T U Culsum V Suendo F Iskandar Chemical Engineering Study Program Faculty of Industrial Technology Bandung Institute of Technology Bandung 40132 Indonesia Chemistry Study Program Faculty of Mathematic and Science Bandung Institute of Technology Bandung 40132 Indonesia Physics Study Program Faculty of Mathematic and Science Bandung Institute of Technology Bandung 40132 Indonesia

Empty fruit bunch (EFB) of palm oil, an abundant agro-waste in Indonesia, was used as raw material of Cellulose Nanocrystals (CNCs) preparation. Instead of conventional acid mineral, phosphotungstic acid (H3PW12O40, HPW) was used to hydrolyze cellulose due to recycling ability and easy handling. Before hydrolysis process, dried EFB was treated by 3% NaOH solution at 90°C for 2 hours and then bleached using 2% NaClO2 solution at 80°C for 3 hours to remove hemicellulose and lignin. Hydrolysis reaction parameters such as temperature, acid concentration, and reaction time were optimized with fixed solid-liquid ratio of 1:40. Response surface method was used for experimental design to determine the optimum condition of each parameter by using software Minitab. In this study, pulp from dried EFB produced 44.8% yield of CNCs. Dynamic Light Scattering (DLS) analysis showed that most of CNCs equivalent diameter was 140 nm. Crystallinity index was observed at 73.3% using X-ray Diffraction (XRD) analysis. Thus, a green established process for the preparation of CNCs was achieved.

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Design of an automatic production monitoring system on job shop manufacturing

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AIP Conference Proceedings 2018年第1期1931卷

作者： Hoedi Prasetyo Yohanes Sugiarto Cucuk Nur Rosyidi 1Master Study Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia 2Mechatronics Department Politeknik ATMI Surakarta Surakarta 57145 Indonesia

Every production process requires monitoring system, so the desired efficiency and productivity can be monitored at any time. This system is also needed in the job shop type of manufacturing which is mainly influenced by the manufacturing lead time. Processing time is one of the factors that affect the manufacturing lead time. In a conventional company, the recording of processing time is done manually by the operator on a sheet of paper. This method is prone to errors. This paper aims to overcome this problem by creating a system which is able to record and monitor the processing time automatically. The solution is realized by utilizing electric current sensor, barcode, RFID, wireless network and windows-based application. An automatic monitoring device is attached to the production machine. It is equipped with a touch screen-LCD so that the operator can use it easily. Operator identity is recorded through RFID which is embedded in his ID card. The workpiece data are collected from the database by scanning the barcode listed on its monitoring sheet. A sensor is mounted on the machine to measure the actual machining time. The system’s outputs are actual processing time and machine’s capacity information. This system is connected wirelessly to a workshop planning application belongs to the firm. Test results indicated that all functions of the system can run properly. This system successfully enables supervisors, PPIC or higher level management staffs to monitor the processing time quickly with a better accuracy.

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Single stage queueing/manufacturing system model that involves emission variable

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IOP Conference Series: Materials Science and engineering 2018年第1期337卷

作者： P S Murdapa I N Pujawan P D Karningsih A H Nasution Industrial Engineering Study Program Faculty of Engineering Widya Mandala Catholic University Madiun Indonesia Department of Industrial Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo-Surabaya 60111 Indonesia Department of Business Management Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo-Surabaya 60111 Indonesia

Queueing is commonly occured at every industry. The basic model of queueing theory gives a foundation for modeling a manufacturing system. Nowadays, carbon emission is an important and inevitable issue due to its huge impact to our environment. However, existing model of queuing applied for analysis of single stage manufacturing system has not taken Carbon emissions into consideration. If it is applied to manufacturing context, it may lead to improper decisisions. By taking into account of emission variables into queuing models, not only the model become more comprehensive but also it creates awareness on the issue to many parties that involves in the system. This paper discusses the single stage M/M/1 queueing model that involves emission variable. Hopefully it could be a starting point for the next more complex models. It has a main objective for determining how carbon emissions could fit into the basic queueing theory. It turned out that the involvement of emission variables into the model has modified the traditional model of a single stage queue to a calculation model of production lot quantity allowed per period.

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Thermochemical Equilibrium Modelling of Steam Gasification of Char From Pattukku Coal Using Cao As Co2 Absorbent

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IOP Conference Series: Earth and Environmental Science 2018年第1期175卷

作者： Takdir Syarif Hary Sulistyo Wahyudi Budi Sediawan Budhijanto Chemical Engineering Study Program Faculty of Industrial Technology Universitas Muslim Indonesia Jl. Urip Sumoharjo KM. 05 Kampus II UMI Makassar Chemical Engineering Department Engineering Faculty Universitas Gadjah Mada Jl. Grafika 2 Yogyakarta

Although it is not able to provide highly accurate results, mathematical models can provide guidance regarding the quantitative influence of design, raw material, and other operating parameters. In addition, the representation of gasification in the form of mathematical equations can help understand the importance of the influence of operating parameters on the performance of a gasifier and can give a good understanding of the mechanisms that occur. In this paper, the steam gasification of char from Pattukku coal using CaO as CO2 absorbent in updraft gasifier was investigated. The aim is to determine the influence of temperature on syngas composition. A mathematical model based on the stoichiometric approach was developed in this study and the results were compared with experimental data. A mixture of coal and lime (CaO) with a ratio of 1:1.5 is fed into the reactor. The electric heater (furnice) is turned on to raise the temperature of the reactor until it reaches the desired reaction temperature ( i.e. 600, 700, and 800 °C). When the reaction temperature is reached, steam was flowed from the bottom of the reactor to be reacted with the char present in the reactor. The steam gasification carried out at a fixed temperature for 60 minutes and every 15 minutes, samples were taken for analysis. Base on the result of the experimental and calculation showed if the temperature of gasifier increase by 100 °C, the volume of gas will increase by approximately 1.7 time. The calculation showed that the proposed model could quantitatively be applied to predict the gas composition of steam gasification of char.

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