Tool For Design Of Systems Research Articles

Aplikasi E-Task Berbasis Student Center Learning Pada Matakuliah Manajemen Proyek Sistem Informasi

At present, there are still many colleges that use Teacher Center Learning (TCL) based learning models. And this has resulted in the low interest of students in following the learning process. The result of the above problem is the decline in student learning outcomes. This study aims to develop a learning media based on Student Center Learning (SCL), by using an E-Task application that can improve students' results and independence in Information Systems Project Management subjects. Where in this case the student will use the E-Task application in working on assignments given by Lecturers independently or in groups, so that in terms of increasing student independence. This research uses the basic concept of system development life cycle (SDLC) system development which is described by the UML system design tool. The designed system flow is illustrated by global design, namely Use Case Diagram. The final result of this research is an E-Task application that is designed attractively so that students are expected to be able to independently carry out their duties and give their assignments to Lecturers anywhere and anytime. With this application students are able to actively work together, so that assignments given to students can be completed quickly, and this application can improve student learning outcomes.

IFC based semi-automated design tool for HVAC central system: A general framework

Traditional HVAC design process contains a large amount of time-consuming work such as load calculation for each space, hydraulic calculation to determine duct size and careful duct layout arrangement to avoid collision. Computer is more suitable for such kind of “dumb” work with higher efficiency and less fault. Also present building design work is a less integrated process where engineers of each domain focus on their own work. This often result in unconformity and poor quality with limited project time. IFC is a neutral platform, open file format specification to facilitate interoperability in the architecture, engineering and construction. In this paper, we propose a general framework of an IFC based integrated semi-automated design tool for central HVAC system design. It contains four main modules corresponding to specific design procedures. Human is allowed to make decision during the design process for more flexibility.

Bounds to Air‐Flow Patterns during Cyclic Air Injection into Partially Saturated Soils Inferred from Extremum States

Core Ideas The problem of periodic air injection from a point source into the soil is analyzed. Air content and pressure are bounded by extremum states of instantaneous water relaxation. Air‐flow pattern determined by two soil parameters and cycle period. Use of simplified analytical solutions enables a preliminary design of an aeration system. Soil‐aeration procedures are widely used as an environmental practice for soil and groundwater remediation (removal of volatile compounds and enhancement of biological treatment) and less frequently as an agricultural practice to prevent root O2 deficiency. Analytical solutions to problems of air flow in the soil allow a phenomenological analysis of the physical problem and the effects of the governing parameters, which in turn enables a more systematic design tool for soil‐aeration systems. We present solutions for the air‐pressure distributions resulting from harmonic (sinusoidal) or square‐wave (step‐pulse) air injection into infinite and semi‐infinite (with an atmospheric pressure at the soil surface) soil domains. The approach presented here suggests using exact (analytical) solutions to extreme (unrealistic) conditions, setting the boundaries of the physical span of the flow problem. The simplified analytical solutions, based on assuming instantaneous water relaxation or, alternatively, assuming stagnant water are used to analyze the effects of different air‐injection modes (constant, harmonic, and step‐pulse) on the air‐pressure distribution and radius of influence (ROI) for different values of the governing parameters: source depth, cycle period, and the soil's air‐conductivity parameters. For long cycle periods, square‐pulse and harmonic air injection can increase the maximal ROI compared with that resulting from steady air injection.

Demand-oriented Hydronic Heating System and the Active One-pipe System Design Tool

This article is focused on hydronic heating systems that use pumps as the control actuators instead of valves. Those systems are called “demand-oriented”, while the systems being controlled by valves are called “supply-oriented”. Reader gets an overview of various versions of both demand- and supply-oriented systems using both one- and two-pipe topologies, supported by a brief historical outline, current state of the art and basic advantages and disadvantages of the introduced hydronic systems. The special interest is given to the one-pipe demand-oriented systems, which offer several benefits in comparison with nowadays widespread systems (mainly supply-oriented two-pipe), however, the computation complexity of design of such systems inhibits their more frequent utilization. This paper also introduces a computation and optimization tool to help with the design of one-pipe demand oriented hydronic heating systems, which eases the designer to size the AHU (Air Handling Units) and to set the mass flows of fluid in the system branches.

Fabrication of patterned three-dimensional micron scaled core-sheath architectures for drug patches

Recent advances in selective integration of micro and nano-scaled features towards material design have paved way to enhance desirable properties or functions of biomaterials. For drug delivery applications these include improved active component encapsulation, controlled drug release and managed interaction with the intended host environment. Electrohydrodynamic (EHD) direct-printing technique is a one-step on demand fiber deposition method which enables precise micron-scaled topographic and structural enhancement during material fabrication. In this study, core-sheath composite fibers comprising polycaprolactone, polyvinyl pyrrolidone and the drug tetracycline hydrochloride were prepared using the coaxial format of EHD direct-printing. Once positioned and aligned; multi-stacked fibers gave rise to patches. Coaxial fiber (diameter range ~13–25 μm) optimization (deposition and integrity) involved parameter-structure (e.g. collector speed, flow rate, working distance and applied voltage) impact analysis. Water contact angle measurements, tensile testing and Fourier transform infrared spectroscopy were used to analyze core-sheath integrated patches. In-vitro drug release studies clearly elude to the impact of core-shell and patterned architectures; demonstrating their viability and the forming method as emerging tools for advanced drug delivery system design and fabrication.

A detailed computational model for cylindrical lithium-ion batteries under mechanical loading: From cell deformation to short-circuit onset

The safety design of systems using lithium-ion batteries (LIBs) as power sources, such as electric vehicles, cell phones, and laptops, is difficult due to the strong multiphysical coupling effects among mechanics, electrochemistry and thermal. An efficient and accurate computational model is needed to understand the safety mechanism of LIBs and thus facilitate fast safety design. In this work, a detailed mechanical model describing the mechanical deformation and predicting the short-circuit onset of commercially available 18650 cylindrical battery with a nickel cobalt aluminum oxide (NCA) system is established for the first time. The mechanical properties of anode, cathode, and separator are characterized. Based on the experiment results, the constitutive models of component materials are established and validated through numerical simulations. A detailed computational model including all components (i.e., separator, anode, cathode, winding, and battery casing) is then developed by evaluating four typical mechanical-loading conditions. Short-circuit criteria are subsequently established based on the separator failure, thereby enabling the mechanical model to predict the short circuit electrochemically. Results show that the model can describe LIB behaviors from mechanical deformation to internal short circuit. Results provide a powerful tool for the safety design of LIBs and related engineering systems.

ANFIS pattern for molecular membranes separation optimization

In this work, molecular separation of aqueous-organic was simulated by using combined soft computing-mechanistic approaches. The considered separation system was a microporous membrane contactor for separation of benzoic acid from water by contacting with an organic phase containing extractor molecules. Indeed, extractive separation is carried out using membrane technology where complex of solute-organic is formed at the interface. The main focus was to develop a simulation methodology for prediction of concentration distribution of solute (benzoic acid) in the feed side of the membrane system, as the removal efficiency of the system is determined by concentration distribution of the solute in the feed channel. The pattern of Adaptive Neuro-Fuzzy Inference System (ANFIS) was optimized by finding the optimum membership function, learning percentage, and a number of rules. The ANFIS was trained using the extracted data from the CFD simulation of the membrane system. The comparisons between the predicted concentration distribution by ANFIS and CFD data revealed that the optimized ANFIS pattern can be used as a predictive tool for simulation of the process. The R2 of higher than 0.99 was obtained for the optimized ANFIS model. The main privilege of the developed methodology is its very low computational time for simulation of the system and can be used as a rigorous simulation tool for understanding and design of membrane-based systems.

An ontology-based approach to knowledge representation for Computer-Aided Control System Design

Different approaches have been used in order to represent and build control engineering concepts for the computer. Software applications for these fields are becoming more and more demanding each day, and new representation schemas are continuously being developed. This paper describes a study of the use of knowledge models represented in ontologies for building Computer Aided Control Systems Design (CACSD) tools. The use of this approach allows the construction of formal conceptual structures that can be stated independently of any software application and be used in many different ones. In order to show the advantages of this approach, an ontology and an application have been built for the domain of design of lead/lag controllers with the root locus method, presenting the results and benefits found.

Studies on flexible rockfall barriers for failure modes, mechanisms and design strategies: a case study of Western China

A field investigation on the actual protective performance of a flexible rockfall barrier along a mountain road in western China is presented in this paper. The total area of the flexible rockfall barrier under investigation was approximately 20,000 m2. Five typical failure modes of the flexible rockfall barrier were revealed, including steel post buckling, connection failure, ring net destruction, steel cable rope breakage and anchorage point failure. In addition, component rusting, which leads to decrease in durability, was noted. Furthermore, failure mechanisms were analysed, and the main factors that were found to induce flexible rockfall barrier failure included the sliding capacity of the cable ropes at the end post support positions, the boundary conditions of the steel posts and the compatibility between the energy dissipating devices and connected cable ropes. From these observations, corresponding design strategies were proposed. In addition, an improved flexible rockfall barrier system was constructed, and its effectiveness was verified by a full-scale impact test using 5000 kJ of impact energy. Finally, the impact deflection, impact force, cable force and energy dissipation of the improved flexible rockfall barrier system were studied in combination with a non-linear numerical simulation which could be a useful tool for design of flexible barrier systems.

Penerapan Algoritma Dijkstra Untuk Menentukan Rute Terbaik Pada Mobile E-Parking Berbasis Sistem Informasi Geografis

Lack of information about the posision of a place and find the best route to get to a destination is complicated, especially looking for a route in finding a parking space. Unavailability of applications that provide information and navigate parking users to find the best route in realtime is a problem that must be answered. Dijkstra's algorithm is one method of solving problems in finding the best route. The Dijkstra algorithm has compared the possible routes to be traversed and calculated every possible distance. The route with the shortest distance would be the best choice This application was built using an Android-based Geographic Information System that utilizes the Google Maps feature as a parking user interface service. This study uses the Java programming language with Android Studio as an IDE (Integrated Development Environment) and the prototyping model is used in developing problem solving and using UML (Unified Modeling Language) as a system design tool. The results that have been achieved from this research is that Dijkstra's algorithm can answer the problem faced by providing the best route navigation from the user's location to the parking lot at the destination

Inverse design of compact multimode cavity couplers.

Efficient coupling between on-chip sources and cavities plays a key role in silicon photonics. However, despite the importance of this basic functionality, there are few systematic design tools to simultaneously control coupling between multiple modes in a compact resonator and a single waveguide. Here, we propose a large-scale adjoint optimization approach to produce wavelength-scale waveguide-cavity couplers operating over tunable and broad frequency bands. We numerically demonstrate couplers discovered by this method that can achieve critical, or nearly critical, coupling between multi-ring cavities and a single waveguide at up to six widely separated wavelengths spanning the 560-1500 nm range of interest for on-chip nonlinear optical devices.

Bond Graphs as Mechatronic Approach for Supervision Design of Multisource Renewable Energy System

This paper deals with the bond graph methodology as a decision-making tool and multiphysic approach for supervision supervision system design. The developed algorithms have been applied to a mechatronic represented by Hybrid Renewable Energy System (HRES) which consists of Solar Photovoltaic Panels (PV) and wind turbines coupled to an electrolyser for hydrogen production used an energy vector for a fuel cell.

Phase separation, antiplasticization and moisture sorption in ternary systems containing polysaccharides and polyols

In this paper, we investigate whether the Flory-Huggins-Free-Volume (FHFV) theory can describe the rich thermodynamics of the ternary mixtures of starch, polyol, and water. These systems exhibit 1) non-monotonic moisture sorption with increasing plasticizer concentration, 2) phase separation, and 3) antiplasticization. After extending the FHFV theory with 1) the proper formulation of the chemical potential of water and polyol, and 2) the proper composition dependency of the interaction parameter between starch and water, the theory is well able to describe the above described complex thermodynamic behavior, showing good agreement with experimental data. Furthermore, our analysis shows that phase separation can already occur when the ternary mixture is still in the glassy state. Overall, the phase separation happens after the antiplasticization/plasticization transition, which can be linked to the minimum in moisture sorption, when increasing the polyol concentration at equal water activity. We think that the extended theory will become an important tool for analysis and design of complex food materials, pharmaceutical systems, and biopolymeric films having carbohydrates as plasticizers.

Design of Web-Based E-Learning Application

This research aims to design a Web-based E-Learning Application at Rumah Belajar LCC-Line. The methods used in designing applications use prototype methods, starting from listening to user needs, building mock-ups of applications, and testing mock-up of applications to users. Systems analysis method uses Object Oriented Analysis and Design (OOAD), and Unified Modelling Language (UML) as a system design tool. The results of this research is a web-based e-learning application design that consists of interaction design between users, data design, and interface design. This E-Learning Application Design can be used to develop and implement E-Learning Applications. With this Web-Based E-Learning Applications can help the process of distance learning so that the learning process becomes more effective and efficient.

RANCANG BANGUN E-COMMERCE PADA TOKO KERUDUNG NURI COLLECTION BERBASIS CUSTOMER RELATIONSHIP MANAGEMENT

E-commerce is a contact of trade transactions between seller and buyer by using electronic media. The advantage gained by using transactions through e-commerce is to increase revenue by using online sales that cost less. E-commerce on Nuri Collection's shop based veil Customer Relationship Management (CRM), namely the application of Customer Relationship Management (CRM) is not directly said as a computerized data customer. It is intended that the company knows what the needs and wants of customers so that it can establish a good relationship with customers. The purpose of this research is to know consumer opinion about Customer Relationship Management (CRM) which conducted by company, analyze consumer loyalty to Nuri Collection product. E-commerce is built using Waterfall system development method, with a system design tools such as Flowmap, DFD, Context diagram, ERD. While in making this e-commerce writer use programming language PHP and MYSQL as database.Keywords: E-commerce, CRM, PHP

A design and analysis tool for utility scale power systems incorporating large scale wind, solar photovoltaics and energy storage

Abstract This paper presents a time series simulation model (including energy storage systems) intended for the modeling of high penetration non-dispatchable renewable power in utility-scale (multi MW) networks. Its initial application was based on an investigation into the application of large-scale energy storage for offshore wind energy systems to the New England electrical grid. The model includes the following: (1) conventional generators (up to seven), (2) wind turbine generators, (3) solar photovoltaic (PV) generators, (4) energy storage and (5) various dispatch options. A detailed summary is presented for the individual components analytical models and the program structure. The program flow and generator dispatch options include: (i) basic, (ii) time of day, (iii) peak-shaving, plus (iv) minimum run time. In addition, several examples/case studies utilizing energy storage are given that illustrate the basic features of the model. The recommendations section details a number of suggestions for future improvements of the model, and what added exercises of the overall model that could be carried out. An overall conclusion of this work is that energy storage will become progressively more important when electrical networks loads are supplied with large amounts of wind and solar PV inputs. Stored energy equivalent to a few days of average load can have a significantly beneficial effect on reducing conventional fuel requirement. Additional storage is still useful but with diminishing returns. Supplying 100% of the load with wind/PV remains a challenge. The effect of partial correlation between spatially separated wind and PV generators can reduce the amount of storage that would otherwise be needed and merits further study.

The Generation of Typical Meteorological Year for Tripoli, Libya

In this paper a Typical Meteorological Year (TMY) of Tripoli city, the capital of Libya was presented and analyzed using twelve year of measured weather data, this data includes global solar radiation, air temperature and wind speed. Th measurements were taken every ten minutes. Finkelstein–Schafer statistical method was applied to analyze the data and obtain the TMY for the site. Typical Meteorological Months (TMMs) were selected by choosing the one with the least deviation from the long-term cumulativedistribution function. A close-fi agreement is observed between the generated TMY and the long-term averages. Ths TMY generated will be very useful tool for optimal design and performance evaluation of solar energy conversion systems, heating, wind, and other renewable energy systems to be located in this part of Libya.

Proceedings of the 1st International Workshop on Methods and Tools for Rigorous System Design

Proceedings of the 1st International Workshop on Methods and Tools for Rigorous System Design

A Process Systems Framework for Rapid Generation of Life Cycle Inventories for Pollution Control and Sustainability Evaluation.

Life Cycle Assessment (LCA) is a tool that aids in sustainable decision-making among product and process alternatives. When implementing LCA, the efficient and accurate modeling of chemical processes for Life Cycle Inventory (LCI) generation is still challenging. Challenges include a lack of systematic design and simulation tools and approaches to develop chemical process models for obtaining and analyzing more realistic LCI results. In this contribution, a novel process systems framework is proposed for estimating LCI results when implementing pollution control technologies. This framework involves the development and incorporation of pollution control unit (PCU) modules into process simulation and generation of LCI data associated with the PCUs for use in a sustainability evaluation. Different pollution control modules are designed for rapid LCI estimation and applied to obtain emissions, utility consumption, material, and land footprint results related to waste streams of a process simulation. Then, the LCI results are analyzed with the objectives of minimizing the environmental impact and utility consumption. The proposed framework is illustrated via a biomass/coal gasification process for syngas production with the end goal of acetic acid manufacturing. Results associated with this case study show that the developed framework can provide guidelines for sustainable decision-making based on generated LCI results.

Sistem Informasi Pelelangan Online Pada PT. Balai Lelang Bandung

PT.Balai Lelang Bandung is a company in Bandung which is located at Ruko Maple Kav. G, Jl. Gn. Batu No. 201, Sukaraja, Cicendo, Bandung - West Java, provides services such as pre-auction, auction, and post auction. The registration process of tender participants is quite convoluted and takes a lot of time in the registration process either in terms of the auction participants or the auctioneer itself. The auction process is very time-consuming bidders themselves, where in conducting the auction, participants are required to attend directly to the auction so many prospective bidders who discontinue their intention to follow the auction process. In this design approach method is prototypemethod, while system development method using Unified Modeling Language (UML). System design tool used to describe the system model such as usecase, scenario diagram, sequence diagram.
 Index Terms - Information System, Online Auctions, Prototype, UML