When reconstructing a shooting incident with a shotgun, the muzzle-to-target distance can be determined by relating the size of a dispersion pattern found on a crime scene to that of test shots. Ideally, the test shots are performed with the weapon and ammunition that were used in the incident. But sometimes examiners will have to resort to alternatives, such as using cartridges of the same brand and type but with another pellet size. For this reason, the relationship between pellet size and shotgun dispersion patterns was studied with both lead and steel shotgun pellets. Cartridges were loaded with identical cartridge cases, powder charges, and wads but with different pellet sizes, below size B. The cartridges were fired, and the dispersion patterns at 5 m in front of the muzzle were measured and compared. The results provide strong support for the proposition that shotgun dispersion patterns with both lead and steel shot increase with decreasing pellet size if all other relevant parameters are kept equal. The results also provide an indicative measure of the magnitude of the effect. Pattern sizes were approximately 1.7 times larger with #9 than with #0 lead shot and 1.4 times larger with #9 than with #1 steel shot. The differences between consecutive shot sizes were generally smaller. This means that cartridges of equal brand and type but with the next nearest shot number can be used for a muzzle-to-target distance determination, keeping the information of the current study in mind in the final interpretation of the results.
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The paper introduced an automatic score detection model using object detection techniques. The performance of sevenmodels belonging to two different architectural setups was compared. Models like YOLOv8n, YOLOv8s, YOLOv8m, RetinaNet-50, and RetinaNet-101 are single-shot detectors, while Faster RCNN-50 and Faster RCNN-101 belong to the two-shot detectors category. The dataset was manually captured from the shooting range and expanded by generating more versatile data using Python code. Before the dataset was trained to develop models, it was resized (640x640) and augmented using Roboflow API. The trained models were then assessed on the test dataset, and their performance was compared using matrices like mAP50, mAP50-90, precision, and recall. The results showed that YOLOv8 models can detect multiple objects with good confidence scores.
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In this study, the construction of rumour on Twitter during a specific crisis is analysed from a discursive psychological perspective. This perspective treats psychological concepts such as identities as discursive constructions. The selected case is the robbery of a jewellery store in Deurne, a village in the Netherlands. The jeweller’s wife was said to have shot two of the robbers. Although this fact was not officially confirmed, people used particular discursive strategies to present the act of the jeweller’s wife as factual, which influenced the way the media reported on this case, as well as the reaction of the prosecutor, which was described as premature. Four dominant discursive patterns were detected, that is: normalizing the act, evaluating the act, upgrading the act and anticipating on the consequences of the act. Furthermore, it is demonstrated how critical tweets, displaying a concern for nuancing the overall tendency of the tweets, were designed in a way that downplayed their overt critical character. Implications of the analysis for crisis communication professionals are discussed. In deze studie wordt geruchtvorming in kaart gebracht met behulp van discursieve psychologie, waarin psychologische concepten zoals identiteit worden behandeld als discursieve constructies. De casus betreft een juwelenrook in Deurne, Nederland, waarbij de vrouw van de juwelier ervan beschuldigd werd twee overvallers te hebben doodgeschoten. Deze beschuldiging werd als feit behandeld op sociale media, ook al was dit nog niet officieel bevestigd. Dit beïnvloedde zowel de nieuwsberichtgeving, als de reactie van de officier van justitie in de media. Vier dominante discursieve patronen werden ontdekt in de discussie over de vermeende daad: normaliseren, evalueren, upgraden en anticiperen op de gevolgen. Ook wordt gedemonstreerd hoe tweets die nuance aanbrengen in de discussie, voorzichtig worden geformuleerd, waardoor het kritische karakter ervan wordt geminimaliseerd. Implicaties voor professionals in risiscommunicatie worden besproken.
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Brochure from the Inauguration of Klaas Dijkstra, professor Computer Vision and Data Science
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The huge number of images shared on the Web makes effective cataloguing methods for efficient storage and retrieval procedures specifically tailored on the end-user needs a very demanding and crucial issue. In this paper, we investigate the applicability of Automatic Image Annotation (AIA) for image tagging with a focus on the needs of database expansion for a news broadcasting company. First, we determine the feasibility of using AIA in such a context with the aim of minimizing an extensive retraining whenever a new tag needs to be incorporated in the tag set population. Then, an image annotation tool integrating a Convolutional Neural Network model (AlexNet) for feature extraction and a K-Nearest-Neighbours classifier for tag assignment to images is introduced and tested. The obtained performances are very promising addressing the proposed approach as valuable to tackle the problem of image tagging in the framework of a broadcasting company, whilst not yet optimal for integration in the business process.
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Wereldwijd onderzoek: Hoe gebruiken nieuwsmedia social media? Jongeren lezen geen krant meer, ze kijken op hun smartphone die ze altijd bij de hand hebben. Binnen het lectoraat social media en reputatiemanagement van NHL hogeschool te Leeuwarden heeft een groep internationale studenten in 12 landen onderzoek gedaan. Hierbij hebben ze meer dan 150 social media sites bestudeerd van nieuws media. De resultaten maken deel uit van een internationaal onderzoek van NHL Hogeschool en Haaga Helia University. De onderzoeksvraag was: Wat speelt zich af in de nieuwsmedia? Persbureaus kunnen het overzicht gebruiken om hun social media te optimaliseren. En voor ieder die journalistiek een warm hart toedraagt is het interessante informatie over de nieuwsmedia in een overgangssituatie (2nd edition)
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Matrix-assisted laser desorption/ionisation time of-flight mass spectrometry (MALDI-TOF MS) is a fast and reliable method for the identification of bacteria from agar media. Direct identification from positive blood cultures should decrease the time to obtaining the result. In this study, three different processing methods for the rapid direct identification of bacteria from positive blood culture bottles were compared. In total, 101 positive aerobe BacT/ALERT bottles were included in this study. Aliquots from all bottles were used for three bacterial processing methods, i.e. the commercially available Bruker's MALDI Sepsityper kit, the commercially available Molzym's MolYsis Basic5 kit and a centrifugation/washing method. In addition, the best method was used to evaluate the possibility of MALDI application after a reduced incubation time of 7 h of Staphylococcus aureus- and Escherichia coli-spiked (1,000, 100 and 10 colony-forming units [CFU]) aerobe BacT/ALERT blood cultures. Sixty-six (65%), 51 (50.5%) and 79 (78%) bottles were identified correctly at the species level when the centrifugation/washing method, MolYsis Basic 5 and Sepsityper were used, respectively. Incorrect identification was obtained in 35 (35%), 50 (49.5%) and 22 (22%) bottles, respectively. Gram-positive cocci were correctly identified in 33/52 (64%) of the cases. However, Gram-negative rods showed a correct identification in 45/47 (96%) of all bottles when the Sepsityper kit was used. Seven hours of pre-incubation of S. aureus- and E. coli-spiked aerobe BacT/ALERT blood cultures never resulted in reliable identification with MALDI-TOF MS. Sepsityper is superior for the direct identification of microorganisms from aerobe BacT/ALERT bottles. Gram-negative pathogens show better results compared to Gram-positive bacteria. Reduced incubation followed by MALDI-TOF MS did not result in faster reliable identification.
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This paper proposes and showcases a methodology to develop an observational behavior assessment instrument to assess psychological competencies of police officers. We outline a step-by-step methodology for police organizations to measure and evaluate behavior in a meaningful way to assess these competencies. We illustrate the proposed methodology with a practical example. We posit that direct behavioral observation can be key in measuring the expression of psychological competence in practice, and that psychological competence in practice is what police organizations should care about. We hope this paper offers police organizations a methodology to perform scientifically informed observational behavior assessment of their police officers’ psychological competencies and inspires additional research efforts into this important area.
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The Dutch conservation area Oostvaardersplassen was initiated as a rewilding project within the Netherlands’ protected area network. It came under the spotlight when management strategies and practices were criticized by scientists, conservation practitioners, and the public, from a number of perspectives – not all of which were compatible. This article reviews the origin, evolution, and application of the rewilding concept and examines the Oostvaardersplassen project as a case study. Our assessment demonstrates that the area was never an appropriate site for rewilding, beset by rudderless management, and led to a situation that was ecologically and ethically untenable. The case study is used to illustrate humanity’s evolving role in environmental protection where advances in the understanding of ecological complexity, animal behavior, and sentience, cannot be ignored when addressing environmental protection, problem solving, and management. Finally, it lays out options for the future in the absence of the three Cs of rewilding, the Cores, Corridors, Carnivores, and introduces the concept of the fourth C, Compassion. https://ijw.org/learning-to-rewild/ LinkedIn: https://www.linkedin.com/in/helenkopnina/
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Our approach builds on both the design traditions of participatory design and embodiment. We attempt to connect these traditions to the existing body of knowledge on persuasion. First we describe some basic theoretical concepts and infer how they influence persuasive design. Then we present a basic framework with which we intend to address the different abstraction layers involved. Finally, we discuss the principal differences and meeting areas between the disciplines of design and communication, ending up with some considerations for a persuasion toolbox that is intended to help communication professionals and designers effectively design behavior change interventions that fit the messy lives of people in the real world
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