Please try the URL privacy information feature enabled by clicking the flashlight icon above. This will reveal two icons after each link the body of the digest. The shield takes you to a breakdown of Terms of Service for the site - however only a small number of sites are covered at the moment. The flashlight take you to an analysis of the various trackers etc. that the linked site delivers. Please let the website maintainer know if you find this useful or not. As a RISKS reader, you will probably not be surprised by what is revealed…
Some strange recent events in England seem computer- and defense-system related, although in a diffuse and rather mysterious way. At this point any commonality among 6 different cases must be considered speculative. However, the "pure coincidence" explanation is not too satisfying, and certainly whets the appetites of conspiracy or collaboration theorists. The following is reported here for the RISKS record, awaiting any further clarification. August 1986: Vimal Dajibhai, 24, programmer with Marconi Underwater Systems, reportedly working on Britain's self-guided torpedo Stingray missile. Found dead beneath a suspension bridge. (No cause identified.) October 1986: Ashad Sharif, 26, computer expert with Marconi Defense Systems, bizarre death, seemingly suicide. January 1987: Richard Pugh, computer design expert, found dead in his home. January 1987: Avtar Singh-Gida, 26, disappeared in northern England while conducting experiments on submarine warfare equipment. 22 February 1987: Peter Peapell, 46, metallurgist involved in secret defense work, died of carbon monoxide poisoning. (Wife doubted it was suicide.) 30 March 1987: David Sands, 37, computer expert working for a Marconi subsidiary on an air force defense system, killed when car crashed into cafe. The British government claims there is no evidence linking the cases. However, Home Secretary Douglas Hurd has ordered police involved in these cases to contact each other. [Source: SF Chronicle, 6 April 1987]
From Business Week, April 13, 1987: The sale of Consolidated Rail Corp. almost blew some fuses at the Treasury Dept. Because Treasury's computers can only handle single transactions of up to $1 billion, underwriters had to break the $1.6 billion from the public offering into two parts before electronically transferring the funds to the government. The underwriters, led by Goldman, Sachs & Co., got a nice chunk of change sent their way too -- $70 million in fees. [I'm surprised that someone was smart enough to know about the $1 billion problem before it really did "blow a fuse". Who knows where the $600,000 million might have ended up!]
If I understand correctly, such principles are used outside of the lab.
According to two books I have read (_The Hunt for Red October_, and
_Submarines_), all American subs and many Russian subs operate the same way.
When you draw more power out, the coolant loses heat and moderates neutrons
more effectively, increasing the chances of causing fission, increasing the
heat output. When your power requirements decrease, the coolant heats up,
does not moderate the neutrons as well and the rate of fission goes down.
An ingenious mechanism but not failsafe as the US Navy has implemented
it. One worse case scenario, for example, is a loss of coolant. If
necessary, the reactor can be opened to the sea, an infinite heat
sink. But by the principles described above, the reaction goes to
full power and may progress beyond the point that the flow of sea
water can handle. There is a good description of this in THFRO.
Nevertheless, it would seem such principles, when practical, are preferable
to the inherently unstable airframes typified by the F-16 and X-29 fighter
planes. As long as people don't put all their faith in them.
Phil Ngai +1 408 982 7840 UUCP: {ucbvax,decwrl,hplabs,allegra}!amdcad!phil
There is a risk to using flight control computers in military aircraft that I believe hasn't been noted on this list so far. The most relevant instances are in the F-16, F-18 and F-20 aircraft. Two F-20 aircraft have been lost while in airshow routines or practices. The computers are designed to limit control actuations so that the aircraft do not enter accelerated stalls at high G-forces. The control actuations are limited also to approximately 9g positive, since this is currently the limits that a pilot can withstand using current equipment, without losing consciousness. The rate of onset of g forces also contributes to the possibility of losing consciousness. An F-20 is capable of attaining at least a 6.2g per second onset rate. The risk is that a pilot may plan on losing some brain function to g-forces, without risking that the plane will go out of control in the maneuver. This possibility is entirely due to the presence of the flight control computer. It leads pilots to enter maneuvers in which they do in fact lose consciousness, inadvertently. The F-20 has crashed twice in airshow routines, after the same potential 9g pull-up maneuver, and in the second instance, at Goose Bay, Labrador, the Canadian equivalent of the NTSB found that the pilot's loss of conciousness was directly responsible for the crash. Were the flight control computer not to assure maneuvering within the envelope in the event of an extreme g maneuver, no pilot would risk loss of control through impaired function, unless in combat. One, possibly two F-20s and their pilots have been lost through risk-taking while relying on a computer. I understand that pilots have been lost in the F-16 and F-18 in similar situations. peter ladkin
According to the advertisments, the version of the HP-41 that is used on the
Space Shuttle has a different plastic in the case, which will not outgas
under vacuum conditions. Is this a similar problem?
Mark Eichin
I just had a small round patch of skin cancer removed from my face, under my right eye. I am under 30 years old, and the surgeon said it was highly unusual for someone my age to have such a problem. He said my skin must be highly sensitive, and I would have to be real careful about exposure to the sun in the future, using a blocking sunscreen preparation. But I am not a heavy tanner or beach-goer. I don't even spend all that much time outdoors. Then the surgeon said, "Oh, you work around computers all day long, don't you?"..........and I am now faced with the frightening possibility that my ten years of hacking in close proximity to CRT's is what gave me skin cancer. I have seen references to studies about the potential danger from CRT radiation but I never paid any attention before. Now I'm inclined to look into the subject - I don't want another skin cancer! The surgeon asked whether it was possible to get a screen with lead shielding on it. The cancerous growth has been on my face for at least a year, possibly longer. I used VT52's starting in 1977 or 78, Foxes, H19's & VT100's, then primarily a monochrome IBM PC starting in 1981 or 82 for three years. In 1984 I got a Sun 2 workstation, in 1985 I got a pre-release IBM RT. Would the workstations emit more radiation, from their larger screens, than the PC or terminals? Are some brands better shielded than others? Would some different placement angle help lower the dosage hitting my face? Christopher Koenigsberg, Andrew Systems Administration, Carnegie-Mellon Univ.
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