In this paper, we propose a new method for reducing assembly time in printed circuit board (PCB) assembly by prioritizing efficient simultaneous pickup operation of placement machines. There are three major problems of the scheduling: (1) component feeder location (affects efficiency of pickup operation), (2) mounting sequencing (affects total distance of the mounting tour) , and (3) simultaneo...

We present the €rst baŠery-free cellphone design that consumes only a few micro-waŠs of power. Our design can sense speech, actuate the earphones, and switch between uplink and downlink communications, all in real time. Our system optimizes transmission and reception of speech while simultaneously harvesting power which enables the baŠery-free cellphone to operate continuously. Œe baŠery-free d...

This paper describes the integration of printed circuit board design and fabrication into a computer architecture course. These printed circuit boards utilized 7400-series chips to realize an 8-bit ALU having the functions ADD, OR, ADD, SUB, and set-less-than. Students designed and laid out the boards using electronic tools. Their designs were sent out for fabrication and the resulting boards w...

Scheduling in the drilling operation of the printed circuit board industry deeply annoys the production management staff on the shop floor due to its high complexity of permutations or combination of jobs, machines, and resource constraints. In this research, two multi-objective genetic algorithms are proposed to deal with such a complicated real-world case. Real-world instances are applied as ...

Problem statement: The “Energy Policy for Europe, EPE” and three environmental directives, proposed by the European Union (EU) in 2007, are stricter than those self-restrained by the enterprises. For this reason, the enterprises have to shortly improve their products for meeting with the strict requests setup by the EU. Consequently, it becomes even more important that the manufacturers evaluat...

A new type of computer-aided engineering environment is envisioned which will improve the productivity of manufacturing/industrial engineers. This environment would be used by engineers to design and implement future manufacturing systems and subsystems. This paper describes work which is currently underway at the United States National Institute of Standards and Technology (NIST) on computer-a...

The time of protostellar wind breakout may be determined by the time-dependence of the infalling flow, rather than any sudden change in the driving wind. I examine the transition from pure infall to simultaneous infall and outflow, or pure outflow, in the context of rotating, inside-out collapse. Assuming a protostellar wind launched from the stellar surface, the breakout time is determined as ...

A 14yearold freshman at a Texas high school was arrested by local police after school administrators reported that an alarm went off insidte his pencil box. The pencil box looked ominous, but what was inside was a digital clock with a preset alarm. Although the alarm might have been disquieting, the clock itself was simply a printed circuit board, a large display, some wires, and a battery conn...

This paper describes the Hangulphabet, a new writing system that should prove useful in a number of contexts. Using the Hangulphabet, a user can instantly see voicing, manner and place of articulation of any phoneme found in human language. The Hangulphabet places consonant graphemes on a grid with the x-axis representing the place of articulation and the y-axis representing manner of articulat...

This is the second year of an ITC experiment, the ITC Lecture Series on Unpowered Opens Testing (UOT). Open solder joints on printed circuit boards have become a frustrating problem in today’s era of advanced component packaging. This forum brings condensed technical and product information to board test engineers (and their managers) that will be immediately useful in their daily endeavors.