Lifting capacity charts are tabulated and provided to operators and practitioners by mobile crane manufacturers. These charts are structured based on predetermined crane configurations, which consist of boom/jib length, lifting radius, main boom angle to ground, and jib angle to ground or its offset to its main boom centerline. It is a tedious job that lifting planners select cranes for construction projects based on a large number of lifting capacity charts. This paper presents a newly developed algorithm for selecting mobile cranes on construction sites, which takes into account the lifting capacity, the geometrical characteristics of the crane, the dimensions of equipments and riggings, and the ground bearing pressure. The algorithm is incorporated into a three-dimensional (3D) computer-aided system that integrates crane selection module, crane modeling module, 3D-simulation module, 3D computer-aided design modeling module, rigging calculation module, and data management module. At last, a case is repr...

In a broad sense, camouflaged objects generally refer to objects that have a high degree of similarity to the background. Therefore, camouflaged object segmentation (COS) is more challenging than traditional object segmentation. Current COS networks have high segmentation precision on datasets. However, the problems of object miss detection and false alarm still occur, mainly due to the different camouflage levels of the objects. In this paper, we propose a Joint Comparative Learning Network (JCNet) for camouflaged object segmentation based on joint salient object for contrastive learning to overcome the widespread challenges in COS. Specifically, the main innovation of JCNet is the Contrastive Network (CNet) design, which generates a unique feature representation of the camouflaged object different from others. In terms of details, we design an edge guidance module to enhance the edge extraction capability. Moreover, a global relationship capture module is proposed to improve the confidence level of the feature representation. Finally, we set positive and negative samples and loss functions in conjunction with sample types. We conducted comprehensive experiments using four COS datasets, and the results demonstrate its suitability for COS when compared with other state-of-the-art segmentation models. JCNet achieves optimal results on five evaluation metrics, including an average improvement of 1.93% and 2.7% on F_m and F ^ω _m , respectively. In summary, it has lower miss and false alarm rates, and better generalization in the COS task. In addition, the experiments demonstrate that JCNet also has strong segmentation capability in salient object segmentation, achieving a win-win situation for both tasks. The code will be available at https://github.com/jiangxinhao2020/JCNet.

Cooperative cranes are widely used in modern construction projects and can reduce the cost and time of heavy lift. The safety of cooperative crane lift can be improved by using simulation method. This paper proposes a statics-based simulation approach for two cooperative cranes, which could accurately determine the slopes and the tensions of the lifting cables. The proposed approach utilizes the principle of minimum potential energy to transform the problem of determining the slopes and tensions of lifting cables to an optimization problem with geometric and physical constraints. The accuracy is verified by comparing with results of ADAMS simulation in different scenarios. Physical properties are taken into account in this approach to make sure that the two-crane cooperative lifting simulation is close to actual lift. The proposed method has been incorporated into a computer-aided system, which assists planners in developing reliable lifting plans more efficiently. The effectiveness and usability ...

Camouflaged object detection (COD), in a broad sense, aims to detect image objects that have high degrees of similarity to the background. COD is more challenging than conventional object detection because of the high degree of “fusion” between a camouflaged object and the background. In this paper, we focused on the accurate detection of camouflaged objects, conducting an in-depth study on COD and addressing the common detection problems of high miss rates and low confidence levels. We proposed a ternary cascade perception-based method for detecting camouflaged objects and constructed a cascade perception network (CPNet). The innovation lies in the proposed ternary cascade perception module (TCPM), which focuses on extracting the relationship information between features and the spatial information of the camouflaged target and the location information of key points. In addition, a cascade aggregation pyramid (CAP) and a joint loss function have been proposed to recognize camouflaged objects accurately. We conducted comprehensive experiments on the COD10K dataset and compared our proposed approach with other seventeen-object detection models. The experimental results showed that CPNet achieves optimal results in terms of six evaluation metrics, including an average precision (AP)₅₀ that reaches 91.41, an AP₇₅ that improves to 73.04, and significantly higher detection accuracy and confidence.

Adversarial attacks that mislead deep neural networks (DNNs) into making incorrect predictions can also be implemented in the physical world. However, most of the existing adversarial camouflage textures that attack object detection models only consider the effectiveness of the attack, ignoring the stealthiness of adversarial attacks, resulting in the generated adversarial camouflage textures appearing abrupt to human observers. To address this issue, we propose a style transfer module added to an adversarial texture generation framework. By calculating the style loss between the texture and the specified style image, the adversarial texture generated by the model is guided to have good stealthiness and is not easily detected by DNNs and human observers in specific scenes. Experiments have shown that in both the digital and physical worlds, the vehicle full coverage adversarial camouflage texture we create has good stealthiness and can effectively fool advanced DNN object detectors while evading human observers in specific scenes.