| 1. |
- Cederberg, Lennart, et al.
(författare)
-
The Arctic Tern: AI + Soft Values = Save Fuel
- 2023
-
Ingår i: 8th Hull Performance & Insight Conference. ; , s. 38-43
-
Konferensbidrag (refereegranskat)abstract
- This paper summaries three years of technical development and research in close collaboration with several major shipping companies. Besides the technical AI-based decision support systems, the project has focused on soft values, how the support systems become efficient support for real, both ashore and onboard. It is important to create knowledge among technical-, commercial- and operation departments within the organisations on how to implement new methods. Different types of vessels operate under vastly different commercial realities that impact the performance and energy effectiveness. Technical systems must be adapted to each actor's reality to achieve a change and drive more climate-friendly transportation. The Arctic Tern shows fuel savings of 2-14%.
|
|
| 2. |
- Ahmedi, Figene, et al.
(författare)
-
InWaterSense : An Intelligent Wireless Sensor Network for Monitoring Surface Water Quality to a River in Kosovo
- 2018
-
Ingår i: International Journal of Agricultural and Environmental Information Systems. - : IGI Global. - 1947-3192 .- 1947-3206. ; 9:1, s. 39-61
-
Tidskriftsartikel (refereegranskat)abstract
- A shift in water monitoring approach from traditional grab sampling to novel wireless sensors is gaining in popularity not only among researchers but also in the market. These latest technologies readily enable numerous advantageous monitoring arrangements like remote, continuous, real-time, and spatially-dense and broad in coverage measurements, and identification of long-term trends of parameters of interest. Thus, a WSN system is implemented in a river in Kosovo as part of the InWaterSense project to monitor its water quality parameters. It is one of the first state of the art technology demonstration systems of its kind in the domain of water monitoring in developing countries like Kosovo. Water quality datasets are transmitted at pre-programmed intervals from sensing stations deployed in the river to the server at university via the GPRS network. Data is then made available through a portal to different target groups (policy-makers, water experts, and citizens). Moreover, the InWaterSense system behaves intelligently like staying in line with water quality regulatory standards.
|
|
| 3. |
- Al-Najjar, Basim
(författare)
-
Condition based maintenance for mechanical systems
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- In this paper a sequential method for the selection of maintenance technique for mechanical systems is presented. It is based on technical knowledge concerning component failure mechanisms and failure causes. Classification of failures according to their consequences is stated. A modified version of failure modes, effects and criticality analysis is given and a way to identify significant components is discussed. Analysis of collected data is discussed and a method to identify a replacement level of a monitoring parameter is proposed. Criteria for the selection of a monitoring technique based on the intrinsic information of monitoring parameters are introduced. Finally, a decision rule for the selection of a suitable maintenance technique is suggested and a modified expression of the long run average cost per unit time is used as a distinguishing criterion between applicable strategies.
|
|
| 4. |
- Al-Najjar, Basim, 1954-
(författare)
-
Just-in time and dynamic maintenance (JIT-Maint) for turbine, generator, gearbox and sawmills : case stories
- 2015
-
Ingår i: 28º COMADEM + X CORENDE 2015. - : Asociación Argentina de Ensayos no Destructivos y Estructurales, AAENDE. - 9789872395766
-
Konferensbidrag (refereegranskat)abstract
- Profitable production demands continuously improved maintenance decision accuracy to reduce unplanned stoppages, prolong components/machines life length and maintain production continuity. When CM, e.g. vibration level or oil temperature, value exceeds a warning level, it demands a clear understanding of what happened and how it will develop to avoid failures. It demands also reliable information, e.g. probability of failure, residual life and when is the most profitable time for maintenance. Companies strive to reduce production cost through reducing non-value adding times, e.g. failures, for offering customers lower prices and generating additional competitive advantages. In this paper, a new tool (Prediction of Vibration and oil temperature, PreVib) for predicting the condition of a turbine, generator and gearbox is introduced, discussed and tested. The solution offers a unique opportunity to achieve just in time dynamic and cost-effective maintenance by selecting the most profitable time for maintenance. PreVib is tested in a power plant. The major results: Failures can appreciably be reduced thanks the high precision of prediction ( + 90%), i.e. a negligible difference from the real measurement: PreVib does not demand extensive or additional data, and not replace available maintenance systems. The major conclusion is that applying PreVib, it is possible to reduce failures appreciably, prolong life length of components/equipment and perform profitable maintenance
|
|
| 5. |
- Al-Najjar, Basim, 1954-
(författare)
-
On a graphical method for the selection of a maintenance technique
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- In this paper a graphical method for the selection of a cost-effective monitoring technique is suggested. Also, a graphical method to estimate the level at which components should be replaced when using a cost-effective technique, i.e. threshold level, is proposed. These two methods are based on the concept of the Total Time on Test, TTT-plot on age and condition dependent replacement is discussed.
|
|
| 6. |
- Al-Najjar, Basim, 1954-
(författare)
-
On the modelling of condition dependent failure rates in mechanical systems
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The cycle between two replacements based on condition monitoring is discussed. Models representing a condition dependent failure rate function reflecting the information in a monitoring parameter are suggested. For the selection of a cost-effective technique, a modified version of the Proportional Hazards Model, PHM, is proposed. Utilizing this modified model, it is possible to reveal the effect of monitoring parameters and operating conditions on the failure rate function. General comments on the application of the cost equation are given.
|
|
| 7. |
- Anokhin, Sergey, et al.
(författare)
-
Strategic effects of corporate venture capital investments
- 2016
-
Ingår i: Journal of Business Venturing Insights. - : Elsevier. - 2352-6734. ; 5, s. 63-69
-
Tidskriftsartikel (refereegranskat)abstract
- This paper analyzes the strategic effects of corporate venture capital investments. Specifically, by studying the deals of 163 corporations over a four-year period, it documents the effects of driving, emerging, enabling, and passive investments on the pool of innovative opportunities available to incumbents and the scale efficiency gains they experience as a result of these investments. The study suggests that by making driving and enabling investments, incumbents position themselves in the industry to take advantage of increased pools of innovative opportunities and improve scale efficiency yields. At the same time, emerging and passive investments are detrimental for both of the strategic goals considered in this paper.
|
|
| 8. |
- Autio, Hanna, et al.
(författare)
-
Historically Based Room Acoustic Analysis and Auralization ofa Church in the 1470s
- 2021
-
Ingår i: Applied Sciences. - : MDPI. - 1454-5101 .- 2076-3417. ; 11:4
-
Tidskriftsartikel (refereegranskat)abstract
- Worship space acoustics have been established as an important part of a nation’s cultural heritage and area of acoustic research, but more research is needed regarding the region of northern Europe. This paper describes the historical acoustics of an important abbey church in Sweden in the 1470s. A digital historical reconstruction is developed. Liturgical material specific to this location is recorded and auralized within the digital reconstruction, and a room acoustic analysis is performed. The analysis is guided by liturgical practices in the church and the monastic order connected to it. It is found that the historical sound field in the church is characterized by the existence of two distinct acoustical subspaces within it, each corresponding to a location dedicated to the daily services of the monastical congregations. The subspaces show significantly better acoustic conditions for liturgical activities compared to the nave, which is very reverberant under the conditions of daily services. Acoustic transmission from the two subspaces is limited, indicating that the monastic congregations were visually and acoustically separated from the visitors in the nave and each other.
|
|
| 9. |
- Boström, Magnus
(författare)
-
Group Composition in the Navigation Simulator : a Pilot Study
- 2012
-
Ingår i: 17th International Navigation Simulator Lecturers' Conference. - Warnemunde, Germany : Hochschule Wismar. - 9783942100991
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- At Kalmar Maritime Academy (KMA) the first-year students at the Master Mariner program complete a course in the use of ARPA. The course includes eight simulator exercises, where seven of them are completed in pairs and the last exercise is an individual assessment. Previously, instructors have encouraged students to choose a new partner for each of the first seven exercises; however, the reason for this strategy has not been well documented. The aim of this study was to examine the effect of fixed versus rotating bridge teams on the individual learning outcome. During an eight-week course in spring 2012, two groups of students were asked to work either with the same or a new partner for each exercise during a course. The result showed no difference between the two groups with regard to the individual assessment, and the students who failed did so because of inadequate interpretation of the ARPA information, and not because of insufficient radar knowledge.
|
|
| 10. |
- Chowdhury, Soumitra, 1983-, et al.
(författare)
-
Smart Product-Service Systems (Smart PSS) in Industrial Firms : A Literature Review
- 2018
-
Ingår i: 10th CIRP Conference on Industrial Product-Service Systems, IPS2 2018, 29-31 May 2018, Linköping, Sweden. - : Elsevier. ; 73, s. 26-31
-
Konferensbidrag (refereegranskat)abstract
- During the last few decades, the PSS literature has documented industrial firms' transformation from the product dominant logic of business to product-service bundles constituted by machines and related services. This transformation has had several dramatic implications on firms' profitability, strategy, operations, organizational setting, sales and marketing approaches, and R&D practices. However, more recently, industrial firms have started to adopt various smart technologies that are embedded within the PSS. The use of smart technologies in PSS gives rise to the new types of PSS that are referred to in this paper as Smart PSS. Based on a literature review of 43 papers from relevant academic fields, this paper seeks answer to the following research question: what are the value creating features of smart product service systems (Smart PSS) in industrial firms? We synthesize the knowledge on Smart PSS to provide a definition and show the distinctive features of Smart PSS and propose an agenda for future research.
|
|
