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Routability is one of the primary objectives in placement. There have been many researches on forecasting routing problems and improving routability in placement but no perfect solution is found. Most traditional routability-driven placers aim to improve global routing result, but true routability lies in detailed routing. Predicting detailed routing routability in placement is extremely difficult...
This paper reports the progress of microsystem integration using hybrid microassembly, based on the recently finished EU FP7 project FAB2ASM. Hybrid microassembly is a technology that merges both highspeed coarse placement and high-accuracy self-alignment technologies. This paper addresses the basic concept of hybrid microassembly for microsystem integration and its process chain: component and interfaces,...
Surface tension-driven self-alignment is reported to be very accurate when the chip and receptor site are well-defined. This paper investigates surface tension-driven self-alignment of microchips on low-precision receptors through experimental studies and theoretical analysis to understand the relation between alignment accuracy and the precision of the receptor edges. Three different types of low-precision...
Ultra-thin dies are difficult to package because of their fragility and flexibility. Current ultra-thin die integration technology for 3D microsystems relies on robotic pick-and-place machines and machine vision, which has rather limited throughput for high-accuracy assembly of fragile ultra-thin dies. In this paper, we report a hybrid assembly strategy that consists of robotic pick-and-place using...
In this paper, we report capillary self-alignment of 200 µm × 200 µm square parts on matching patterns with undercut edges. The undercut edge structure is a purely topographical feature that provides ultimate pinning for liquids of any surface tension without chemical treatment. We show contact angles close to 180° for low surface tension liquids, and capillary self-alignment using thermally curable...
This paper proposes a hybrid microassembly technique for massively parallel assembly of 200μm × 200μm × 30μm SU-8 chips. The hybrid microassembly technique combines the robotic pick-and-place technique and water mist induced self-assembly technique. The robotic handling tool is used to place microchips roughly on chips of the same size at a fast speed, and then water mist composed of microscopic droplets...
This paper discusses capillary self-alignment assisted hybrid microassembly of chips on low precision patterns, in both the precision of the dimension and the precision of the edge smoothness. Special segmented patterns having jagged edges have been purposely designed and fabricated to mimic some real-world RFID antennas. Experimental tests have been carried out to investigate influence of the dimension...
QuikScan is an innovative document format aimed at facilitating reading and information navigation in documents. It employs multiple within-document summaries formatted as numbered list items to summarize the gist of each section of a document. The presence of the summaries, with a fine level of granularity, enables readers to skim for the superordinate ideas of each section and locate particular...
A fuzzy neural network (FNN) multi-step prediction model based on singular spectrum analysis (SSA) and mean generating function (MGF) for summer precipitation has been developed in this paper. In the modeling process, the original standardized sample series of summer precipitation was denoised and reconstructed with SSA, the extended matrix of MGF of the reconstructed precipitation series (as the...
A novel range-free localization approach, smallest enclosing Circle based Localization (SECL), has been proposed. This approach uses the center of smallest enclosing circle of neighboring anchor nodes to estimate the position of target. Comparing to centroid, SECL considers the geometrical coverage of anchors rather than the mass center of them. Consequently, SECL is robust to imperfect topology,...
Mean shift is a nonparametric method to estimate the density gradient, which iteratively computes the mean of observations and shifts to the centroid until reach a predefined end condition. This paper proposes a mean shift based scheme for localization and tracking in wireless sensor networks.Mean shift is a generalized framework, and range-free centroid and range-based W-Centrod are both the special...
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