Y. C. Liang

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As flip chip packages continue to migrate to Pb-free solder and micro-bumping (μbump) for 3D IC stacking, achieving high reliability with reduced dimension and concurrent increase in current density has become one of the major challenges for microelectronic packaging systems. In this study, the electromigration (EM) performance of the nominal C4 and(More)
A novel discrete particle swarm optimization (PSO) method is presented to solve the generalized traveling salesman problem (GTSP). The "generalized vertex" is employed to represent the problem, by which the GTSP and TSP can be handled in a uniform style. An uncertain searching strategy and local searching techniques are also employed to accelerate the(More)
Based on the concepts of operation template and virtual job shop, this paper attempts to solve several job shop scheduling problems with different scale and analyzes the relationship among the population size, mutation probability, the number of evolving generations and the complexity of the undertaking problem visually by using the trend chart of the(More)
A modified particle swarm optimization (PSO) algorithm is proposed. Linear constraints in the PSO are added to satisfy the normalization conditions for different problems. A hybrid algorithm based on the modified PSO and combining forecasting is presented. Combining forecasting can improve the forecasting accuracy through combining different forecasting(More)
Assist circuits for SRAM have become a foreseeable solution for Vmin improvement. In this work, we characterized SRAM Vmin behaviors with read-write assist circuit before and after high temperature operating life (HTOL) stress. Our study demonstrated that read assist with suppressed wordline design not only improved time zero SRAM Vmin window, but also(More)
A hybrid algorithm based on particle swarm optimization (PSO) and genetic operations is presented and applied to the constrained two-dimensional non-guillotine cutting stock problem. A converting approach similar to the bottom left (BL) algorithm is also used to map the cutting pattern to the actual layout. Simulations show that the proposed algorithm(More)
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