Academic literature on the topic 'TRS-80 (Computer)'

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During observation sessions, discontinuous recording of behavioral events (time sampling and interval recording) introduces sampling error into the data. Continuous recording of data is methodologically superior, but makes greater demands on observers and often requires expensive and cumbersome equipment There is a need for equipment and software that are easy to use and transportable and that integrate data collection and analysis functions. The Behavioral Observation System—Computerized (BOSCO) was developed for the TRS-80 Model 100 and 102 portable laptop computers. BOSCO allows the computer to be used to (a) create and use an observation system, and (b) assess and calculate interobserver agreement. The computer's built-in, real-time clock allows accurate timing of each entry to within one second. This article describes the features and functions of BOSCO, illustrating its application through brief descriptions of several studies in which it has been employed.

A large number of evidence has been accumulated regarding the effectiveness of audio-visual aids and Computer Assisted Instructions for teaching and learning, both in lectures and laboratories. Applications of videotape, videodisc, microcomputer, and TRS-80 are discussed and a few suggestions given.

Abstract Data collection and analysis are time-consuming processes. Each time data are transcribed, the probability of error increases. Electronic data collection devices are commercially available; however, they are relatively expensive (more than $2000). In addition, they may require programming by the user, or purchase of program instructions in the form of read-only memory (ROM) chips. Many individuals cannot afford to invest in one of these devices. Several lightweight portable computers are now available for under $1000. Among these is one sold by Radio Shack under the trade name TRS 80 Model 100 (Radio Shack, a division of Tandy Corporation, Fort Worth, TX 76102) which can be purchased with different amounts of memory and comes with a phone modem for telecommunications, an RS-232C interface, a text editor, and resident MBASIC (Microsoft Corporation, 10700 Northrup Way, Bellevue, WA 98004) programming language. MBASIC is a relatively common version of BASIC which is available for a large selection of computers. The Model 100 could thus be used for data collection, text preparation, and programming applications in BASIC. Currently, no menu-driven data collection programs are available for the Model 100 or any other portable computer.

Tryptophan is an essential dietary amino acid that originates uremic toxins that contribute to end-stage kidney disease (ESKD) patient outcomes. We evaluated serum levels and removal during haemodialysis and haemodiafiltration of tryptophan and tryptophan-derived uremic toxins, indoxyl sulfate (IS) and indole acetic acid (IAA), in ESKD patients in different dialysis treatment settings. This prospective multicentre study in four European dialysis centres enrolled 78 patients with ESKD. Blood and spent dialysate samples obtained during dialysis were analysed with high-performance liquid chromatography to assess uremic solutes, their reduction ratio (RR) and total removed solute (TRS). Mean free serum tryptophan and IS concentrations increased, and concentration of IAA decreased over pre-dialysis levels (67%, 49%, −0.8%, respectively) during the first hour of dialysis. While mean serum total urea, IS and IAA concentrations decreased during dialysis (−72%, −39%, −43%, respectively), serum tryptophan levels increased, resulting in negative RR (−8%) towards the end of the dialysis session (p < 0.001), despite remarkable Trp losses in dialysate. RR and TRS values based on serum (total, free) and dialysate solute concentrations were lower for conventional low-flux dialysis (p < 0.001). High-efficiency haemodiafiltration resulted in 80% higher Trp losses than conventional low-flux dialysis, despite similar neutral Trp RR values. In conclusion, serum Trp concentrations and RR behave differently from uremic solutes IS, IAA and urea and Trp RR did not reflect dialysis Trp losses. Conventional low-flux dialysis may not adequately clear Trp-related uremic toxins while high efficiency haemodiafiltration increased Trp losses.

Abstract Background The CT of PET CT provides diagnostic information, anatomic localisation and attenuation correction (AC). When only AC is required, very lose dose CT is desirable. CT iterative reconstruction (IR) improves image quality with lower exposures however there is little data on very low dose IR CT for AC of PET. This work assesses the impact of CT exposure and reconstruction algorithm on PET voxel values. Method An anthropomorphic torso phantom was filled with physiologically typical [18]F concentrations in heart, liver and background compartments. A 17-mm-diameter right lung “tumour” filled with [18]F was included (surrounding lung contained no 18[F]). PET was acquired followed by 24 CT acquisitions with varying CT exposures (15–50 mAs, 80–120 kVp, pitch 0.671 or 0.828). Each CT was reconstructed twice using filtered back projection (FBP) or IR and these used for AC of PET. The reference PET reconstruction (RR) used CT acquired at 50 mAs, 120 kVp, pitch 0.828, IR, all others were test PET reconstructions (TR). Regions of interest (ROIs) were drawn in the liver, soft tissue and over “tumour” on each TR and compared with the RR. Voxel values in each TR were compared to the RR using a paired t test and by calculating which and what proportion of voxels in each TR differed by a quantitatively significant difference (QSD) from the RR. Results TRs reconstructed using lower dose CTs underestimated mean and maximum ROI activity relative to the RR; greater with IR than FBP. Once CT dose index (CTDI) increased to 1 mGy, differences were less than QSD. On voxel analysis, all TRs were significantly different to the RR (p < 0.0001). TRs reconstructed at the lowest CT exposure with IR had 6% of voxels that differed by greater than QSD. Differences were reduced with increasing CTDI and FBP reconstruction. Voxels which exceeded the QSD were spatially localised to regions of high activity, interfaces between different attenuation and areas of CT beam hardening. Conclusions Very low dose CT exposures are feasible for accurate PET AC. Scanner- and reconstruction-specific validation should be employed prior very low dose CT AC for PET.

My thesis is that new media, starting with analog broadcast and going through digital convergence, blur the line between work time and free time. The technology that we are adopting has transformed free time into potential and actual labour time. At the dawn of the modern age, work shifted from tasked time to measured time. Previously, tasked time intermingled work and leisure according to the vagaries of nature. All this was banished when industrial capitalism instituted the work clock (Mumford 12-8). But now, many have noticed how post-industrial capitalism features a new intermingling captured in such expressions as "24/7" and "multi-tasking." Yet, we are only beginning to understand that media are driving a return to the pre-modern where the hour and the space are both ambiguous, available for either work or leisure. This may be the unfortunate side effect of the much vaunted "interactivity." Do you remember the old American TV show Dobie Gillis (1959-63) which featured the character Maynard G. Krebs? He always shuddered at the mention of the four-letter word "work." Now, American television shows makes it a point that everyone works (even if just barely). Seinfeld was a bold exception in featuring the work-free Kramer; a deliberate homage to the 1940s team of Abbott and Costello. Today, as welfare is turned into workfare, The New York Times scolds even the idle rich to adopt the work ethic (Yazigi). The Forms of Broadcast and Digital Media Are Driving the Merger of Work and Leisure More than the Content It is not just the content of television and other media that is undermining the leisured life; it is the social structure within which we use the media. Broadcast advertisements were the first mode/media combinations that began to recolonise free time for the new consumer economy. There had been a previous buildup in the volume and the ubiquity of advertising particularly in billboards and print. However, the attention of the reader to the printed commercial message could not be controlled and measured. Radio was the first to appropriate and measure its audience's time for the purposes of advertising. Nineteenth century media had promoted a middle class lifestyle based on spending money on home to create a refuge from work. Twentieth century broadcasting was now planting commercial messages within that refuge in the sacred moments of repose. Subsequent to broadcast, home video and cable facilitated flexible work by offering entertainment on a 24 hour basis. Finally, the computer, which juxtaposes image/sound/text within a single machine, offers the user the same proto-interactive blend of entertainment and commercial messages that broadcasting pioneered. It also fulfills the earlier promise of interactive TV by allowing us to work and to shop, in all parts of the day and night. We need to theorise this movement. The theory of media as work needs an institutional perspective. Therefore, I begin with Dallas Smythe's blindspot argument, which gave scholarly gravitas to the structural relationship of work and media (263-299). Horkheimer and Adorno had already noticed that capitalism was extending work into free time (137). Dallas Smythe went on to dissect the precise means by which late capitalism was extending work. Smythe restates the Marxist definition of capitalist labour as that human activity which creates exchange value. Then he considered the advertising industry, which currently approaches200 billion in the USA and realised that a great deal of exchange value has been created. The audience is one element of the labour that creates this exchange value. The appropriation of people's time creates advertising value. The time we spend listening to commercials on radio or viewing them on TV can be measured and is the unit of production for the value of advertising. Our viewing time ipso facto has been changed into work time. We may not experience it subjectively as work time although pundits such as Marie Winn and Jerry Mander suggest that TV viewing contributes to the same physical stresses as actual work. Nonetheless, Smythe sees commercial broadcasting as expanding the realm of capitalism into time that was otherwise set aside for private uses. Smythe's essay created a certain degree of excitement among political economists of media. Sut Jhally used Smythe to explain aspects of US broadcast history such as the innovations of William Paley in creating the CBS network (Jhally 70-9). In 1927, as Paley contemplated winning market share from his rival NBC, he realised that selling audience time was far more profitable than selling programs. Therefore, he paid affiliated stations to air his network's programs while NBC was still charging them for the privilege. It was more lucrative to Paley to turn around and sell the stations' guaranteed time to advertisers, than to collect direct payments for supplying programs. NBC switched to his business model within a year. Smythe/Jhally's model explains the superiority of Paley's model and is a historical proof of Smythe's thesis. Nonetheless, many economists and media theorists have responded with a "so what?" to Smythe's thesis that watching TV as work. Everyone knows that the basis of network television is the sale of "eyeballs" to the advertisers. However, Smythe's thesis remains suggestive. Perhaps he arrived at it after working at the U.S. Federal Communications Commission from 1943 to 1948 (Smythe 2). He was part of a team that made one last futile attempt to force radio to embrace public interest programming. This effort failed because the tide of consumerism was too strong. Radio and television were the leading edge of recapturing the home for work, setting the stage for the Internet and a postmodern replication of the cottage industries of pre and proto-industrial worlds. The consequences have been immense. The Depression and the crisis of over-production Cultural studies recognises that social values have shifted from production to consumption (Lash and Urry). The shift has a crystallising moment in the Great Depression of 1929 through 1940. One proposal at the time was to reduce individual work hours in order to create more jobs (see Hunnicut). This proposal of "share the work" was not adopted. From the point of view of the producer, sharing the work would make little difference to productivity. However, from the retailer's perspective each individual worker would accumulate less money to buy products. Overall sales would stagnate or decline. Prominent American economists at the time argued that sharing the work would mean sharing the unemployment. They warned the US government this was a fundamental threat to an economy based on consumption. Only a fully employed laborer could have enough money to buy down the national inventory. In 1932, N. A. Weston told the American Economic Association that: " ...[the labourers'] function in society as a consumer is of equal importance as the part he plays as a producer." (Weston 11). If the defeat of the share the work movement is the negative manifestation of consumerism, then the invasion by broadcast of our leisure time is its positive materialisation. We can trace this understanding by looking at Herbert Hoover. When he was the Secretary of Commerce in 1924 he warned station executives that: "I have never believed that it was possible to advertise through broadcasting without ruining the [radio] industry" (Radio's Big Issue). He had not recognised that broadcast advertising would be qualitatively more powerful for the economy than print advertising. By 1929, Hoover, now President Hoover, approved an economics committee recommendation in the traumatic year of 1929 that leisure time be made "consumable " (Committee on Recent Economic Changes xvi). His administration supported the growth of commercial radio because broadcasting was a new efficient answer to the economists' question of how to motivate consumption. Not so coincidentally network radio became a profitable industry during the great Depression. The economic power that pre-war radio hinted at flourished in the proliferation of post-war television. Advertisers switched their dollars from magazines to TV, causing the demise of such general interest magazines as Life, The Saturday Evening Postet al. Western Europe quickly followed the American broadcasting model. Great Britain was the first, allowing television to advertise the consumer revolution in 1955. Japan and many others started to permit advertising on television. During the era of television, the nature of work changed from manufacturing to servicing (Preston 148-9). Two working parents also became the norm as a greater percentage of the population took salaried employment, mostly women (International Labour Office). Many of the service jobs are to monitor the new global division of labour that allows industrialised nations to consume while emerging nations produce. (Chapter seven of Preston is the most current discussion of the shift of jobs within information economies and between industrialised and emerging nations.) Flexible Time/ Flexible Media Film and television has responded by depicting these shifts. The Mary Tyler Moore Show debuted in September of 1970 (see http://www.transparencynow.com/mary.htm). In this show nurturing and emotional attachments were centered in the work place, not in an actual biological family. It started a trend that continues to this day. However, media representations of the changing nature of work are merely symptomatic of the relationship between media and work. Broadcast advertising has a more causal relationship. As people worked more to buy more, they found that they wanted time-saving media. It is in this time period that the Internet started (1968), that the video cassette recorder was introduced (1975) and that the cable industry grew. Each of these ultimately enhanced the flexibility of work time. The VCR allowed time shifting programs. This is the media answer to the work concept of flexible time. The tired worker can now see her/his favourite TV show according to his/her own flex schedule (Wasser 2001). Cable programming, with its repeats and staggered starting times, also accommodates the new 24/7 work day. These machines, offering greater choice of programming and scheduling, are the first prototypes of interactivity. The Internet goes further in expanding flexible time by adding actual shopping to the vicarious enjoyment of consumerist products on television. The Internet user continues to perform the labour of watching advertising and, in addition, now has the opportunity to do actual work tasks at any time of the day or night. The computer enters the home as an all-purpose machine. Its purchase is motivated by several simultaneous factors. The rhetoric often stresses the recreational and work aspects of the computer in the same breath (Reed 173, Friedrich 16-7). Games drove the early computer programmers to find more "user-friendly" interfaces in order to entice young consumers. Entertainment continues to be the main driving force behind visual and audio improvements. This has been true ever since the introduction of the Apple II, Radio Shack's TRS 80 and Atari 400 personal computers in the 1977-1978 time frame (see http://www.atari-history.com/computers/8bits/400.html). The current ubiquity of colour monitors, and the standard package of speakers with PC computers are strong indications that entertainment and leisure pursuits continue to drive the marketing of computers. However, once the computer is in place in the study or bedroom, its uses fully integrates the user with world of work in both the sense of consuming and creating value. This is a specific instance of what Philip Graham calls the analytical convergence of production, consumption and circulation in hypercapitalism. The streaming video and audio not only captures the action of the game, they lend sensual appeal to the banner advertising and the power point downloads from work. In one regard, the advent of Internet advertising is a regression to the pre-broadcast era. The passive web site ad runs the same risk of being ignored as does print advertising. The measure of a successful web ad is interactivity that most often necessitates a click through on the part of the viewer. Ads often show up on separate windows that necessitate a click from the viewer if only to close down the program. In the words of Bolter and Grusin, click-through advertising is a hypermediation of television. In other words, it makes apparent the transparent relationship television forged between work and leisure. We do not sit passively through Internet advertising, we click to either eliminate them or to go on and buy the advertised products. Just as broadcasting facilitated consumable leisure, new media combines consumable leisure with flexible portable work. The new media landscape has had consequences, although the price of consumable leisure took awhile to become visible. The average work week declined from 1945 to 1982. After that point in the US, it has been edging up, continuously (United States Bureau of Labor Statistics). There is some question whether the computer has improved productivity (Kim), there is little question that the computer is colonising leisure time for multi-tasking. In a population that goes online from home almost twice as much as those who go online from work, almost half use their online time for work based activities other than email. Undoubtedly, email activity would account for even more work time (Horrigan). On the other side of the blur between work and leisure, the Pew Institute estimates that fifty percent use work Internet time for personal pleasure ("Wired Workers"). Media theory has to reengage the problem that Horkheimer/Adorno/Smythe raised. The contemporary problem of leisure is not so much the lack of leisure, but its fractured, non-contemplative, unfulfilling nature. A media critique will demonstrate the contribution of the TV and the Internet to this erosion of free time. References Bolter, Jay David, and Richard Grusin. Remediation: Understanding New Media. Cambridge, MA: MIT Press, 2000. Committee on Recent Economic Changes. Recent Economic Changes. Vol. 1. New York: no publisher listed, 1929. Friedrich, Otto. "The Computer Moves In." Time 3 Jan. 1983: 14-24. Graham, Philip. Hypercapitalism: A Political Economy of Informational Idealism. In press for New Media and Society2.2 (2000). Horkheimer, Max, and Theodor W. Adorno. Dialectic of Enlightenment. New York: Continuum Publishing, 1944/1987. Horrigan, John B. "New Internet Users: What They Do Online, What They Don't and Implications for the 'Net's Future." Pew Internet and American Life Project. 25 Sep. 2000. 24 Oct. 2001 <http://www.pewinternet.org/reports/toc.asp?Report=22>. Hunnicutt, Benjamin Kline. Work without End: Abandoning Shorter Hours for the Right to Work. Philadelphia: Temple UP, 1988. International Labour Office. Economically Active Populations: Estimates and Projections 1950-2025. Geneva: ILO, 1995. Jhally, Sut. The Codes of Advertising. New York: St. Martin's Press, 1987. Kim, Jane. "Computers and the Digital Economy." Digital Economy 1999. 8 June 1999. October 24, 2001 <http://www.digitaleconomy.gov/powerpoint/triplett/index.htm>. Lash, Scott, and John Urry. Economies of Signs and Space. London: Sage Publications, 1994. Mander, Jerry. Four Arguments for the Elimination of Television. New York: Morrow Press, 1978. Mumford, Lewis. Technics and Civilization. New York: Harcourt Brace, 1934. Preston, Paschal. Reshaping Communication: Technology, Information and Social Change. London: Sage, 2001. "Radio's Big Issue Who Is to Pay the Artist?" The New York Times 18 May 1924: Section 8, 3. Reed, Lori. "Domesticating the Personal Computer." Critical Studies in Media Communication17 (2000): 159-85. Smythe, Dallas. Counterclockwise: Perspectives on Communication. Boulder, CO: Westview Press, 1993. United States Bureau of Labor Statistics. Unpublished Data from the Current Population Survey. 2001. Wasser, Frederick A. Veni, Vidi, Video: The Hollywood Empire and the VCR. Austin, TX: U of Texas P, 2001. Weston, N.A., T.N. Carver, J.P. Frey, E.H. Johnson, T.R. Snavely and F.D. Tyson. "Shorter Working Time and Unemployment." American Economic Review Supplement 22.1 (March 1932): 8-15. <http://links.jstor.org/sici?sici=0002-8282%28193203%2922%3C8%3ASWTAU%3E2.0.CO%3B2-3>. Winn, Marie. The Plug-in Drug. New York: Viking Press, 1977. "Wired Workers: Who They Are, What They're Doing Online." Pew Internet Life Report 3 Sep. 2000. 24 Oct. 2000 <http://www.pewinternet.org/reports/toc.asp?Report=20>. Yazigi, Monique P. "Shocking Visits to the Real World." The New York Times 21 Feb. 1990. Page unknown. Links http://www.pewinternet.org/reports/toc.asp?Report=20 http://www.pewinternet.org/reports/toc.asp?Report=22 http://www.atari-history.com/computers/8bits/400.html http://www.transparencynow.com/mary.htm http://www.digitaleconomy.gov/powerpoint/triplett/index.htm http://links.jstor.org/sici?sici=0002-8282%28193203%2922%3C8%3ASWTAU%3 E2.0.CO%3B2-3 Citation reference for this article MLA Style Wasser, Frederick. "Media Is Driving Work" M/C: A Journal of Media and Culture 4.5 (2001). [your date of access] < http://www.media-culture.org.au/0111/Wasser.xml >. Chicago Style Wasser, Frederick, "Media Is Driving Work" M/C: A Journal of Media and Culture 4, no. 5 (2001), < http://www.media-culture.org.au/0111/Wasser.xml > ([your date of access]). APA Style Wasser, Frederick. (2001) Media Is Driving Work. M/C: A Journal of Media and Culture 4(5). < http://www.media-culture.org.au/0111/Wasser.xml > ([your date of access]).