Dual Image-Based CNN Ensemble Model for Waste Classification in Reverse Vending Machine

A reverse vending machine motivates citizens to bring recyclable waste by rewarding them, which is a viable solution to increase the recycling rate. Reverse vending machines generally use near-infrared sensors, barcode sensors, or cameras to classify recycling resources. However, sensor-based reverse vending machines suffer from a high configuration cost and the limited scope of target objects, and conventional single image-based reverse vending machines usually make erroneous predictions about intentional fraud objects. This paper proposes a dual image-based convolutional neural network ensemble model to address these problems. For this purpose, we first created a prototype reverse vending machine and constructed an image dataset containing two cross-sections of objects, top and front view. Then, we chose convolutional neural network models widely used in image classification as the candidates for building an accurate and lightweight ensemble model. Considering the size and classification performance of candidates, we constructed the best-fit ensemble combination and evaluated its classification performance. The final ensemble model showed a classification accuracy higher than 95% for all target classes, including fraud objects. This result proves that our approach achieves better robustness against intentional fraud objects than single image-based models and thus can broaden the scope for target resources. The measurement results on lightweight embedded platforms also demonstrated that our model provides a short inference time that is enough to facilitate the real-time execution of reverse vending machines based on low-cost edge artificial intelligence devices.

Renaissance Cardinals and Pontifical Mules

Renaissance cardinals proclaimed their status in various ways. When riding, particularly when accompanying the pope or royalty, cardinals preferred to ride on a mule. This essay examines the social, legal, and ceremonial issues surrounding cardinals’ use of mules as a sign of humility, while they simultaneously spent large sums on obtaining and equipping these animals. The grand ceremonial tack for formal processions was essential to the cohesive image that the Sacred College tried to project in public ritual. The examination of images of cardinals on mules, historical accounts in diaries and letters, as well as entries in account books, indicates the importance of the dual image of humility and magnificence portrayed by pontifical mules.

Studies of Intra-Fraction Prostate Motion During Stereotactic Irradiation in First Irradiation and Re-Irradiation

BackgroundUnderstanding intra-fractional prostate motions is crucial for stereotactic body radiation therapy (SBRT). No studies have focused on the intra-fractional prostate motions during re-irradiation with SBRT. The objective was to evaluate these translational and rotational motions in primary treated patients and in the context of re-irradiation.MethodsFrom January 2011 to March 2020, 162 patients with histologically proven prostate cancer underwent prostate SBRT, including 58 as part of a re-irradiation treatment. We used the continuous coordinates of the fiducial markers collected by an orthogonal X-ray dual-image monitoring system. The translations and rotations of the prostate were calculated. Prostate deviations representing overall movement was defined as the length of the 3D-vectors.ResultsA total of 858 data files were analyzed. The deviations over time in the group of primary treated patients were significantly larger than that of the group of re-irradiation, leading to a mean deviation of 2.73 mm (SD =1.00) versus 1.90 mm (SD =0.79), P<0.001. In the re-irradiation group, we identified displacements of -0.05 mm (SD =1.53), 0.20 mm (SD =1.46); and 0.42 mm (SD =1.24) in the left-right, superior-inferior and anterior-posterior planes. Overall, we observed increasing deviations over the first 30 min followed by a stabilization related to movements in the three translational axes.ConclusionThis is the first study to focus on intrafraction prostate motions in the context of re-irradiation. We observed that intra-fraction prostate motions persisted in the setting of re-irradiation, although they showed a significant reduction when compared with the first irradiation. These results will help to better estimate random errors during SBRT treatment of intra-prostatic recurrence after irradiation.

The Horse and the Lion in Achaemenid Persia: Representations of a Duality

This paper explores the ambiguous Persian Achaemenid attitude towards the horse and the lion. It examines the way these animals appear in imperial official presentations, local artifacts throughout the empire and Greek textual representations. In the case of the stallion, it looks at the imagery of horse riding or the place of the horse in society and religion alongside the employment of steeds in chariots. Images of the lion are addressed in instances where it appears to be respected as having a significant protective power and as the prey of the chase. This paper attempts to show that this ambiguity corresponds roughly to the dual image of the Persians as both pre-imperial/nomad and imperial/sedentary (and hence allegedly luxurious), a schism that is manifest in both the self-presentation of the Achaemenids and in the Greek texts.