PERANCANGAN SISTEM INFORMASI PERSEDIAAN BAHAN BAKU DI UD. XY, TULUNGAGUNG

The availability of raw material supplies is very important in maintaining the sustainability of the production process in a company. The purpose of this research was to design a web-based raw material inventory information system to meet the needs of users in controlling shanghai peanut raw material supplies. The system approach method used in this study was prototyping. System design used the concept of Object Oriented Programming (OOP) with UML version 2.0, MySQL and XAMPP databases as local servers and the PHP programming language. The result of the information were information about the list of raw materials, supply of raw materials, use of raw materials, and availability of raw materials for shanghai peanut in the warehouse. Verification and validation tests using the black box method and the system design test showed that the results of the information system design have been running well and as expectedKeywords: information system, inventory, peanut,raw material

Arguing Security: A Framework for Analyzing Security Requirements

When considering the security of a system, the analyst must simultaneously work with two types of properties: those that can be shown to be true, and those that must be argued as being true. The first consists of properties that can be demonstrated conclusively, such as the type of encryption in use or the existence of an authentication scheme. The second consists of things that cannot be so demonstrated but must be considered true for a system to be secure, such as the trustworthiness of a public key infrastructure or the willingness of people to keep their passwords secure. The choices represented by the second case are called trust assumptions, and the analyst should supply arguments explaining why the trust assumptions are valid. This thesis presents three novel contributions: a framework for security requirements elicitation and analysis, based upon the construction of a context for the system; an explicit place and role for trust assumptions in security requirements; and structured satisfaction arguments to validate that a system can satisfy the security requirements. The system context is described using a problem-centered notation, then is validated against the security requirements through construction of a satisfaction argument. The satisfaction argument is in two parts: a formal argument that the system can meet its security requirements, and structured informal arguments supporting the assumptions exposed during argument construction. If one cannot construct a convincing argument, designers are asked to provide design information to resolve the problems and another pass is made through the framework to verify that the proposed solution satisfies the requirements. Alternatively, stakeholders are asked to modify the goals for the system so that the problems can be resolved or avoided. The contributions are evaluated by using the framework to do a security requirements analysis within an air traffic control technology evaluation project

Melhoria do desempenho operacional de linhas de montagem de estruturas de sistemas sanitários

A concorrência entre organizações aliada à globalização tem-se sentido na necessidade de definição do processo. Surge um cliente cada vez mais exigente, impondo prazos cada vez mais rígidos, causando problemas de capacidade nas empresas. Neste seguimento, o projeto teve lugar na OLI- Sistemas Sanitários, S.A., mais precisamente nas linhas de montagem de estruturas para autoclismos interiores, que experienciaram um crescimento da sua procura e com previsão de aumento nos próximos anos. Foi utilizada uma metodologia de action research para se atingirem os objetivos, isto é, com análise direta do chão de fábrica e com tentativa-erro. O presente trabalho teve como intuito o cálculo dos tempos de operação dos diferentes códigos de produto utilizando o MTM, com a criação de um procedimento de afetação de tarefas por posto de trabalho, de forma a reduzir tempo de não valor acrescentado. Foi ainda objetivo deste projeto, uma análise ergonómica para posterior estudo de uma proposta de melhoria, fazendo a sua simulação no software Arena, utilizando os tempos inicialmente calculados como base. O procedimento de afetação de tarefas revelou-se mais eficiente do que o método anteriormente usado pela empresa nos três KPIs analisados: diferença entre os routings (em unidades produzidas por hora), diferença da folga entre postos (em segundos) e diferença de inatividade (em %). A ergonomia, dos nove tópicos que foram analisados, num check-up geral que se realizou às linhas, era o que possuía uma pontuação final mais baixa. O estudo de simulação da proposta de melhoria revelou a redução de parte das atividades de risco a nível ergonómico, levando a um aumento da pontuação deste tópico, subindo de 30% para 65%. A automatização revelou também à empresa que ficaria melhor preparada para o crescimento dos produtos montados nas linhas em análise, prevendo-se um aumento de 390 caixas produzidas por turno de trabalho.Competition between organizations allied with globalization has been reflecting the need of process definition. Thus, emerge a more challenging client, with more strict deadlines, leading to capacity problems in the companies. With this being said, the project took place at OLI- Sistemas Sanitários, S.A., more precisely in the lines of assembly of structures to interior flushings, which experienced an increase of its demand, with a prediction of growth in the following years. An action research methodology was utilized to achieve the goals, with a direct analysis of the shop floor and a trial-error approach. The following work aimed to calculate the operations time of the different products using MTM, with a procedure to affect the tasks between the workstations, in order to reduce time of non-added value. Another objective of this study was an ergonomic analysis with a subsequent simulation study using Arena software, with the operations time calculated at the beginning as basis. The procedure to affect the tasks between the workstations came out more efficient than the method previously used by the company in the three KPIs analyzed: difference between routings (in units produced per hour), difference of inactivity time between workstations (in seconds) and difference between downtime (in %). Ergonomics, in the nine topics analyzed, in a general check-up done to the lines, was the one with a lower score. The simulation study of the proposal improvement revealed a reduction of a great part of the activities with ergonomic risk, leading to an increase of the score of this topic, increasing from 30% to 65%. The automatization also revealed to the company that they would be better prepared to the growth of the products assembled in the lines analyzed, with an expectation of more 390 boxes produced per work shift.Mestrado em Engenharia e Gestão Industria

Stochastic simulation of a Commander's decision cycle (SSIM CODE)

This thesis develops a stochastic representation of a tactical commanderâ s decision cycle and applies the model within the high-resolution combat simulation: Combined Arms Analysis Tool for the 21st Century (Combat XXI). Combat XXI is a Joint Army-Marine Corps effort to replace the Combined Arms and Support Evaluation Model (CASTFOREM)â a legacy combat simulation. Combat XXI is a non-interactive, high-resolution, analytical combat simulation focused on tactical combat. Combat XXI is being developed by the U.S. Army TRADOC Analysis Center-White Sands Missile Range (TRAC- WSMR) and the Marine Corps Combat Development Command (MCCDC). Combat XXI models land and amphibious warfare for applications in the research, development and acquisition, and the advanced concepts requirements domains. Stochastic decision-making enhances Command and Control (C2) decision processes in Combat XXI. The stochastic simulation of a commanderâ s decision cycle (SSIM CODE) addresses variability in decision-making due to uncertainty, chance and the commanderâ s attributes. A Bayesian Network representation of a conditional probability model for a commanderâ s decision cycle is implemented in SSIM CODE. This thesis develops, applies and evaluates the effectiveness of SSIM CODE.http://archive.org/details/stochasticsimula109452518US Marine Corps (USMC) autho

The impact of adopting Additive Manufacturing on responsive supply chain performance

Additive Manufacturing (AM), or 3D printing as it is frequently known, is an umbrella term for a collection of manufacturing technologies that enables products to be manufactured layer-by-layer from three-dimensional digital data. While the costs associated with AM represents a barrier to its wider adoption, its benefits outweigh its costs when considered in some contexts. Few studies have investigated the costs and benefits of this technology from a supply chain perspective, particularly in market environments characterized by demand uncertainty. In this type of scenario, it becomes necessary to adopt higher levels of internal competencies, find the optimal way to manage inventories and flexibly respond to sudden market requirements. This thesis therefore aims to address this gap by examining three key aspects: the learning effects offered by AM, the impact of AM on inventory-related costs and the impact of AM on the critical capability of flexibility. To assess learning in AM, this thesis focuses on the experimental measurement of AM operator time and improvement in operator effectiveness as a result of learning. Learning is thus assessed by measuring the reduction of labour time through operator learning within a series of build repetitions and estimates a progress ratio which captures the learning effect within this series. To assess the impact of AM on inventory-related costs, this thesis develops a conceptual model that matches possible AM scenarios with demand volume level and severity of stockout penalty. It also conducts a case study to obtain insights into the resulting model which has been developed. In this case study, an interprocess comparison is undertaken by simulating a supply chain based on data collected from a plastic products manufacturing company that produces pipe fittings using Injection Moulding (IM) technology. The simulation model produced has been built using the Arena software package for three distinct scenarios: the current configuration with IM only, iii a proposed configuration with AM only, and a proposed configuration that combines AM with IM. To evaluate the impact of AM on flexibility, a conceptual model has also been constructed that maps certain AM characteristics relevant to flexibility to key market disruption scenarios faced by managers. This aspect is also highlighted through the case study which assesses the impact of AM on four distinct supply chain flexibility types: volume, delivery, mix and new product using metrics obtained from the literature. The results obtained on learning in AM suggest that AM exhibits a learning effect for both the novice and the expert operator with progress ratios of 67.73% and 80.42% respectively. Further, results on the impact of AM on inventory-related costs revealed that utilizing IM alone showed the lowest supply chain unit cost (€0.90) compared to utilizing AM as a stand-alone (€2.72) or in a combined approach (€0.94). With regards to AM’s impact on flexibility, the supply chain employing IM showed greater volume and delivery flexibility levels (i.e. 65.68% and 92.8% for IM compared to 58.70% and 75.35% for AM, respectively). However, AM showed higher mix and new product introduction flexibility level, indicated by the lower changeover time and cost of new product introduction to the system (i.e. 0.33 hrs and €0 for AM compared to 4.91 hrs and €30,000 for IM, respectively). It is anticipated that these results can be used to inform practitioners and scholars on various contexts where AM can create value and the appropriate and timely investments needed to unlock that value

Noise source identification on large generator units

Abstract unavailable please refer to PD

Multi-process modelling approach to complex organisation design

Present day markets require manufacturing enterprises (MEs) to be designed and run in a flexibly structured yet optimised way. However, contemporary approaches to ME engineering do not enable this requirement to capture ME attributes such that suitable processes, resource systems and support services can be readily implemented and changed. This study has developed and prototyped a model-driven environment for the design, optimisation and control of MEs with an embedded capability to handle various types of change. This so called Enriched-Process Modelling (E-MPM) Environment can support the engineering of strategic, tactical and operational processes and comprises two parts: (1) an E-MPM Method that informs, structures, and guides modelling activities required at different stages of ME systems design; and (2) an E-MPM Modelling Framework that specifies interconnections between modelling concepts necessary for the design and run time operation of ME systems. [Continues.

The Second Annual International Space University Alumni Conference

The papers presented at the conference reflect the multidisciplinary nature of the International Space University (ISU) and its alumni. The first papers presented hold special relevance to the design projects, and cover such topics as lunar-based astronomical instrumentation, solar lunar power generation, habitation on the moon, and the legal issues governing multinational astronauts conducting research in space. The next set of papers cover various technical issues such as project success assessment, satellite networks and space station dynamics, thus reflecting the diverse backgrounds of the ISU alumni

Estudo de simulação para melhoria do desempenho de uma linha de produção na indústria eletrónica

Mestrado em Engenharia e Gestão IndustrialO presente relatório de projeto relata a análise dinâmica do processo produtivo de um dos principais produtos fabricados pela empresa Exatronic. Foi desenvolvido um modelo de simulação representativo da linha de produção com o objetivo de avaliar o desempenho do processo produtivo do produto Tunísia tendo como base algumas medidas de desempenho como tempo de ciclo, lead time, taxa de utilização dos recursos e número e tempo das entidades em fila de espera. É descrito o desenvolvimento do modelo propriamente dito e são apresentados oito cenários que mostram sugestões de melhoria para o processo produtivo. Os resultados do estudo apresentam melhorias no processo e mostram que a simulação é uma ferramenta fundamental para melhorar sistemas de produção e para apoiar a tomada de decisão.The present project report describes the dynamic analysis of the production process of one of the main products produced by the Exatronic company. It was developed a simulation model of the production line in order to evaluate the performance of the production process based on some performance measures such as cycle time, lead time, utilization rate of resources and entities number and time in queue. It is described the model development and eight scenarios that show improvement suggestions to the production process are presented. The study results show improvements in the process and show that simulation is an important tool to improve production systems and to support decision making

Challenges for engineering students working with authentic complex problems

Engineers are important participants in solving societal, environmental and technical problems. However, due to an increasing complexity in relation to these problems new interdisciplinary competences are needed in engineering. Instead of students working with monodisciplinary problems, a situation where students work with authentic complex problems in interdisciplinary teams together with a company may scaffold development of new competences. The question is: What are the challenges for students structuring the work on authentic interdisciplinary problems? This study explores a three-day event where 7 students from Aalborg University (AAU) from four different faculties and one student from University College North Denmark (UCN), (6th-10th semester), worked in two groups at a large Danish company, solving authentic complex problems. The event was structured as a Hackathon where the students for three days worked with problem identification, problem analysis and finalizing with a pitch competition presenting their findings. During the event the students had workshops to support the work and they had the opportunity to use employees from the company as facilitators. It was an extracurricular activity during the summer holiday season. The methodology used for data collection was qualitative both in terms of observations and participants’ reflection reports. The students were observed during the whole event. Findings from this part of a larger study indicated, that students experience inability to transfer and transform project competences from their previous disciplinary experiences to an interdisciplinary setting