Poetry of the ruins: recalling the memories of past

Màster universitari en Estudis Avançats en Arquitectura - Contemporary ProjectThroughout history, the concept of ruins has been the subject of continuous perversion. From the ancient Greek era to the current era of globalization and destruction, scholars, philosophers, artists, architects, and filmmakers have described many cultural concepts about ruins. The ruins are promptly interpreted from symbolic value to incomplete proof. From "picturesque" or "sublime" forms to the passing of time and the ephemeral contemplation of human conditions; from political reflection on authoritarianism to evidence of mass destruction; from memory objects to active venues for change. If the concept of "ruins" is released from a purely literary and picturesque profession, we can realize that, as Walter Benjamin (1963) proclaimed, the past is ruins above ruins, and "Ruins" are eternal and inevitable conditions. In every era, time, war, and natural disasters have occurred and continue to produce ruins, which prompts people to think about how to deal with them. The ruins caused by elements considered to belong to distant objects in the past have increasingly become contemporary intrusive elements, which are now of great significance

Bone in vivo: Surface mapping technique

Bone surface mapping technique is proposed on the bases of two kinds of uniqueness of bone in vivo, (i) magnitude of the principal moments of inertia, (ii) the direction cosines of principal axes of inertia relative to inertia reference frame. We choose the principal axes of inertia as the bone coordinate system axes. The geographical marks such as the prime meridian of the bone in vivo are defined and methods such as tomographic reconstruction and boundary development are employed so that the surface of bone in vivo can be mapped. Experimental results show that the surface mapping technique can both reflect the shape and help study the surface changes of bone in vivo. The prospect of such research into the surface shape and changing laws of organ, tissue or cell will be promising.Comment: 9 pages, 6 figure

SWIPT in Mixed Near- and Far-Field Channels: Joint Beam Scheduling and Power Allocation

Extremely large-scale array (XL-array) has emerged as a promising technology to enhance the spectrum efficiency and spatial resolution in future wireless networks by exploiting massive number of antennas for generating pencil-like beamforming. This also leads to a fundamental paradigm shift from conventional far-field communications towards the new near-field communications. In contrast to the existing works that mostly considered simultaneous wireless information and power transfer (SWIPT) in the far field, we consider in this paper a new and practical scenario, called mixed near- and far-field SWIPT, where energy harvesting (EH) and information decoding (ID) receivers are located in the near- and far-field regions of the XL-array base station (BS), respectively. Specifically, we formulate an optimization problem to maximize the weighted sum-power harvested at all EH receivers by jointly designing the BS beam scheduling and power allocation, under the constraints on the maximum sum-rate and BS transmit power. First, for the general case with multiple EH and ID receivers, we propose an efficient algorithm to obtain a suboptimal solution by utilizing the binary variable elimination and successive convex approximation methods. To obtain useful insights, we then study the joint design for special cases. In particular, we show that when there are multiple EH receivers and one ID receiver, in most cases, the optimal design is allocating a portion of power to the ID receiver for satisfying the rate constraint, while the remaining power is allocated to one EH receiver with the highest EH capability. This is in sharp contrast to the conventional far-field SWIPT case, for which all powers should be allocated to ID receivers. Numerical results show that our proposed joint design significantly outperforms other benchmark schemes without the optimization of beam scheduling and/or power allocation.Comment: In this paper, we consider a new scenario of mixed-field SWIPT, and studied efficient beam scheduling and power allocation. The paper is accepted to JSAC. arXiv admin note: substantial text overlap with arXiv:2304.0794