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Full-Text Articles in Mechanical Engineering

A Study Aimed At Characterizing The Interfacial Structure In A Tin-Silver Solder On Nickel-Coated Copper Plate During Aging, D. C. Lin, R. Kovacevic, T. S. Srivatsan, Guo-Xiang Wang Jun 2008

A Study Aimed At Characterizing The Interfacial Structure In A Tin-Silver Solder On Nickel-Coated Copper Plate During Aging, D. C. Lin, R. Kovacevic, T. S. Srivatsan, Guo-Xiang Wang

Mechanical Engineering Faculty Research

This paper highlights the interfacial structure of tin-silver (Sn-3·5Ag) solder on nickel-coated copper pads during aging performance studies at a temperature of 150°C for up to 96 h. Experimental results revealed the as-solidified solder bump made from using the lead-free solder (Sn-3·5Ag) exhibited or showed a thin layer of the tin-nickel-copper intermetallic compound (IMC) at the solder/substrate interface. This includes a sub-layer having a planar structure immediately adjacent to the Ni-coating and a blocky structure on the inside of the solder. Aging performance studies revealed the thickness of both the IMC layer and the sub-layer, having ...


Implementing High-Speed String Matching Hardware For Network Intrusion Detection Systems, Ajay Mahajan, Benfano Soewito, Sai K. Parsi, Ning Weng, Haibo Wang Feb 2008

Implementing High-Speed String Matching Hardware For Network Intrusion Detection Systems, Ajay Mahajan, Benfano Soewito, Sai K. Parsi, Ning Weng, Haibo Wang

Mechanical Engineering Faculty Research

This paper presents high-throughput techniques for implementing FSM based string matching hardware on FPGAs. By taking advantage of the fact that string matching operations for different packets are independent, a novel multi-threading FSM design is presented, which dramatically increases the FSM frequency and the throughput of string matching operations. In addition, design techniques for high-speed interconnect and interface circuits for the proposed FSM are also presented. Experimental results conducted on FPGA platforms are presented to study the effectiveness of the proposed techniques and explore the trade-offs between system performance, strings partition granularity and hardware resource cost.


Fabrication Of Complex 3d Micro-Scale Scaffolds And Drug Delivery Devices Using Dynamic Mask Projection Microstereolithography, Jae-Won Choi, In-Baek Park, Ryan B. Wicker, Seok-Hee Lee, Ho-Chan Kim Jan 2008

Fabrication Of Complex 3d Micro-Scale Scaffolds And Drug Delivery Devices Using Dynamic Mask Projection Microstereolithography, Jae-Won Choi, In-Baek Park, Ryan B. Wicker, Seok-Hee Lee, Ho-Chan Kim

Mechanical Engineering Faculty Research

Microstereolithography (μSL) technology can fabricate three-dimensional (3D) tissue engineered scaffolds with controlled biochemical and mechanical micro-architectures. A μSL system for tissue engineering was developed using a Digital Micromirror Device (DMDTM) for dynamic pattern generation and an ultraviolet (UV) lamp filtered at 365 nm for crosslinking the photoreactive polymer solution. The μSL system was designed with x-y resolution of ~2 μm and a vertical (z) resolution of ~1 μm. To demonstrate the use of μSL in tissue engineering, poly(propylene fumarate) (PPF) was synthesized with a molecular weight of ~1200 Da. The viscosity of the PPF was reduced to ~150 cP ...


A Simulation-Based Approach For Dock Allocation In A Food Distribution Center, Balagopal Gopakumar, Suvarna Sundaram, Shengyong Wang Jan 2008

A Simulation-Based Approach For Dock Allocation In A Food Distribution Center, Balagopal Gopakumar, Suvarna Sundaram, Shengyong Wang

Mechanical Engineering Faculty Research

This research endeavor focused on the warehouse receiving process at a large food distribution center, which comprises of trucks with goods reaching the destination warehouse, unloading and finally putting away the contents to the specific aisles. Discrete event simulation was used to model the current system’s functioning and to identify operational inefficiencies which were quantified through a detailed value stream mapping exercise. Inspired by ‘lean’ philosophy, a dock allocation algorithm was designed to take into account the relationship between the dock location and the destination aisle to ‘optimally’ assign the trucks to the docks. After validating the baseline, new ...


An Evaluation Of A Stem Program For Middle School Students On Learning Disability Related Ieps, Paul C. Lam, Dennis Doverspike, Julie Zhao, Jiang Zhe, Craig C. Menzemer Jan 2008

An Evaluation Of A Stem Program For Middle School Students On Learning Disability Related Ieps, Paul C. Lam, Dennis Doverspike, Julie Zhao, Jiang Zhe, Craig C. Menzemer

Mechanical Engineering Faculty Research

A year long Science, Technology, Engineering and Math (STEM) program was developed for middle schools students on Individualized Education Programs (IEPs) involving learning disabilities. The workshops were designed to encourage students both on IEPs and not on IEPs to explore STEM as a future career choice by building their knowledge and confidence. The participants in the workshops included 11 students on IEPs and 15 students not on IEPs. Parents also provided feedback regarding their attitudes toward the program. The results indicated that there were increases in student participant knowledge and career interest for both the students not on IEPs and ...


High Ppeed Circuit Techniques For Network Intrusion Detection Systems (Nids), Ajay Mohan Mahajan Jan 2008

High Ppeed Circuit Techniques For Network Intrusion Detection Systems (Nids), Ajay Mohan Mahajan

Mechanical Engineering Faculty Research

No abstract provided.