Several studies show that logistics facilities have spread spatially from relatively concentrated clusters in the 1970s to geographically more decentralized patterns away from urban areas. The literature indicates that logistics costs are one of the major influences on changes in distribution structures, or locations and usage of logistics facilities. Quantitative modelling studies that aim to describe or predict these phenomena in relation to logistics costs are lacking, however. This is relevant to design more effective policies concerning spatial development, transport and infrastructure investments as well as for understanding environmental consequences of freight transport. The objective of this paper is to gain an understanding of the responsiveness of spatial logistics patterns to changes in these costs, using a quantitative model that links production and consumption points via distribution centers. The model is estimated to reproduce observed use of logistics facilities as well as related transport flows, for the case of the Netherlands. We apply the model to estimate the impacts of a number of scenarios on the spatial spreading of regional distribution activity, interregional vehicle movements and commodity flows. We estimate new cost elasticities, of the demand for trade and transport together, as well as specifically for the demand for the distribution facility services. The relatively low cost elasticity of transport services and high cost elasticity for the distribution services provide new insights for policy makers, relevant to understand the possible impacts of their policies on land use and freight flows.
The academic and professional attention to the large synergies hidden in horizontal collaborations is increasing. This study attempts to address the impact of collaborative transport on transportation lead-time and lead-time variability through empirically investigating a group of SMEs involved in a collaborative distribution network. Data was collected for seven pre-cooperation and eight cooperative orders over a period of 14 months. The results of Mann-Whitney U-test show a significant average reduction of 30.8% in the duration of lead times. Lead-time variability was also found to be reduced as the result of changes in the coefficient of variances and the Bartlett’s test for homogeneity of variances. Horizontal collaboration in transport could eventually lead to reduced lead times and lower variability of lead time which results in reduced supply chain costs. This can be achieved by means of direct routing and avoiding multi-transshipment routes which reduces the uncertainty and variability by diminishing the number of stages in the transport chain. Thus, effective lead-time management is considered a source of competitive advantage as it can reduce supply chain costs by lowering inventory levels, but is also capable of improving performance and customer service by offering improved product quality service levels.
Onderzoeksplatform ‘Connected Learning: ’Al ruim vijftien jaar houdt De Haagse Hogeschool zich bezig met onderzoek als deel van haar missie. Terwijl onderwijs vaak geworteld is in monodisciplinaire vakgebieden, kan met onderzoek wat makkelijker gekeken worden naar domeinen in de samenleving (zorg, veiligheid, ondernemen, etc.) waarin complexe problematiek steeds vaker wél dan niet een multidisciplinaire aanpak vereist. Bijna niemand werkt nog alleen of met alleen vakgenoten aan problemen of uitdagingen. En die veranderende beroepspraktijk is bij uitstek het domein van het hoger beroepsonderwijs. Daar leiden we voor op. Het onderzoeken van en experimenteren met nieuwe uitdagingen in de praktijk verbindt ons sterker met de samenleving, het stelt ons in staat om ons beroepsonderwijs te vernieuwen en geeft docenten, onderzoekers en studenten de kans om zich te ontwikkelen door samen te werken aan vragen en uitdagingen die de toekomst van de beroepspraktijk vorm geven. Veel onderzoek wordt uitgevoerd onder begeleiding van lectoren die samenwerken met docent-onderzoekers, studenten, en professionals in het werkveld aan veelal meerjarige onderzoeksagenda’s die lijn aanbrengen in verschillende deelactiviteiten. Een van de manieren waarop De Haagse Hogeschool onderzoek organiseert is in de vorm van onderzoeksplatforms die zich richten op verschillende domeinen van de samenleving. Wij zijn ‘Connected Learning’, een onderzoeksplatform dat zich richt op leren in de netwerksamenleving - in de samenleving zelf, maar ook in de beroepspraktijk en in ons onderwijs. Aangenaam. Wat wij doen? Daar gaat dit boek over, dus daar verklappen we hier nog niets over. Wat verwacht u als u nadenkt over onze naam? Enig idee? Geen idee? Benieuwd? Lees verder om te ontdekken wat ons inspireert, uitdaagt en nieuwsgierig maakt. Sommige van onze ideeën zijn doordacht en doorleefd omdat we er al jaren onderzoek naar doen, andere zijn nieuw en dagen ons uit om er grip op te krijgen. Wij geven met dit boek een beeld van waar we staan in 2018. Zie het als een eerste kennismaking, met de nadruk op ‘eerste’: we werken graag met veel en verschillende partners. Zie het als visitekaartje van onze onderzoeksagenda. We hopen van harte dat u zich als lezer uitgenodigd voelt om met ons samen op zoek te gaan—misschien wel naar een gezamenlijke toekomst. ‘Connected Learning’ Research Platform: For over fifteen years, The Hague University of Applied Sciences has been carrying out research as part of its mission. While education is often rooted in monodisciplinary subject areas, research allows for a broader look at areas of society (care, security, entrepreneurship etc.), where complex problems more often than not require a multidisciplinary approach. Today, barely anyone works on problems or challenges alone or solely with colleagues from within the same subject area. Universities of applied sciences are uniquely placed to deal with these changes in professional practices; after all, we train the professionals who will one day enter that field. Researching and experimenting with new challenges in professional practice allows us to connect more strongly with society, enables us to be innovative in our professional training and gives lecturers, researchers and students the opportunity to develop themselves by cooperating on the challenges and issues that will shape the future of that professional practice. Most research is carried out under the guidance of professors who cooperate with lecturers/researchers, students and the professional field, mainly on long-term research agendas that provide an outline for various sub-activities. One of the ways in which research is organised at The Hague University of Applied Sciences is in the form of research platforms that focus on various areas of society. We are ‘Connected Learning’, a research platform focusing on learning in the network society — in that society as such, but also in professional practice and our education. Nice to meet you! So, what do we do? That’s what this book is about, so we’re not going to give anything away just yet. Just thinking about our name, what do you expect we do? Any ideas? Or not a clue at all? If you’d like to find out, keep reading to find out what inspires us, what challenges we face and what drives our curiosity. Some of our ideas are well-established because we’ve been researching them for years, while other, newer ideas are more challenging to grasp. This book provides an overview of where we stand in 2018. You could see it as an initial introduction, with the emphasis on “initial”; we work with many different partners, and we enjoy doing so. Alternatively, you could see it as a calling card for our research agenda. We sincerely hope that, as a reader, you feel encouraged to join us in our quest — possibly towards a joint future.
The pipelines are buried structures. They move together with the soil during a seismic event. They are affected from ground motions. The project aims to find out the possible effects of Groningen earthquakes on pipelines of Loppersum and Slochteren.This project is devised for conducting an initial probe on the available data to see the possible actions that can be taken, initially on these two pilot villages, Loppersum and Slochteren, for detecting the potential relationship between the past damages and the seismic activity.Lifeline infrastructure, such as water mains and sewerage systems, covering our urbanised areas like a network, are most of the times, sensitive to seismic actions. This sensitivity can be in the form of extended damage during seismic events, or other collateral damages, such as what happened in Christchurch Earthquakes in 2011 in New Zealand when the sewerage system of the city was filled in with tonnes of sand due to liquefaction.Regular damage detection is one of key solutions for operational purposes. The earthquake mitigation, however, needs large scale risk studies with expected spatial distribution of damages for varying seismic hazard levels.
The integration of renewable energy resources, controllable devices and energy storage into electricity distribution grids requires Decentralized Energy Management to ensure a stable distribution process. This demands the full integration of information and communication technology into the control of distribution grids. Supervisory Control and Data Acquisition (SCADA) is used to communicate measurements and commands between individual components and the control server. In the future this control is especially needed at medium voltage and probably also at the low voltage. This leads to an increased connectivity and thereby makes the system more vulnerable to cyber-attacks. According to the research agenda NCSRA III, the energy domain is becoming a prime target for cyber-attacks, e.g., abusing control protocol vulnerabilities. Detection of such attacks in SCADA networks is challenging when only relying on existing network Intrusion Detection Systems (IDSs). Although these systems were designed specifically for SCADA, they do not necessarily detect malicious control commands sent in legitimate format. However, analyzing each command in the context of the physical system has the potential to reveal certain inconsistencies. We propose to use dedicated intrusion detection mechanisms, which are fundamentally different from existing techniques used in the Internet. Up to now distribution grids are monitored and controlled centrally, whereby measurements are taken at field stations and send to the control room, which then issues commands back to actuators. In future smart grids, communication with and remote control of field stations is required. Attackers, who gain access to the corresponding communication links to substations can intercept and even exchange commands, which would not be detected by central security mechanisms. We argue that centralized SCADA systems should be enhanced by a distributed intrusion-detection approach to meet the new security challenges. Recently, as a first step a process-aware monitoring approach has been proposed as an additional layer that can be applied directly at Remote Terminal Units (RTUs). However, this allows purely local consistency checks. Instead, we propose a distributed and integrated approach for process-aware monitoring, which includes knowledge about the grid topology and measurements from neighboring RTUs to detect malicious incoming commands. The proposed approach requires a near real-time model of the relevant physical process, direct and secure communication between adjacent RTUs, and synchronized sensor measurements in trustable real-time, labeled with accurate global time-stamps. We investigate, to which extend the grid topology can be integrated into the IDS, while maintaining near real-time performance. Based on topology information and efficient solving of power flow equation we aim to detect e.g. non-consistent voltage drops or the occurrence of over/under-voltage and -current. By this, centrally requested switching commands and transformer tap change commands can be checked on consistency and safety based on the current state of the physical system. The developed concepts are not only relevant to increase the security of the distribution grids but are also crucial to deal with future developments like e.g. the safe integration of microgrids in the distribution networks or the operation of decentralized heat or biogas networks.
Climate change has impacted our planet ecosystem(s) in many ways. Among other alterations, the predominance of long(er) drought periods became a point of concern for many countries. A good example is The Netherlands, a country known by its channels and abundant surface water, which has listed “drought effect mitigation” among the different topics in the last version of its “Innovation Agenda” (Kennis en Innovatie Agenda, KIA). There are many challenges to tackle in such scenario, one of them is solutions for small/decentralized communities that suffer from dry-up of surface reservoirs and have no groundwater source available. Such sites are normally far from big cities and coastal zones, which impair the supply via distribution networks. In such cases, Atmospheric Water Generation (AWG) technologies are a plausible solution. These systems have relatively small production rates (few m3 per day), but they can still provide enough volume for cities with up to 100k inhabitants. Despite having real scale systems already installed in different locations worldwide, most systems are between TRL 5 and 6. Thus need further development. SunCET proposes an in-situ evaluation of an AWG system (WaterWin) developed by two different Dutch companies (Solaq and Sustainable Eyes) in the Brazilian semi-arid state of Ceará. The cooperation with NHL Stenden will provide the necessary expertise, analytical and technical support to conduct the tests. The state government of Ceará built an infrastructure to support the realization of in-situ tests, as they want to further accelerate technology implementation in the state. Such structure will make it possible to share costs and decrease total investments for the SMEs. Finally, it is also intended to help establishing partnerships between Dutch SMEs and Brazilian end users, i.e. municipalities of the Ceará state and small agriculture companies in the region.
