the design of everyday things don norman pdf

... available from the appearance of the objects the psychology of everyday things And part comes from the ability of the designer to make the operation clear, to project a good image of the operation, ... when they are unable to use simple things, guilt that should be not theirs but rather the designers and manufacturers of the objects So it all came together These ideas, the respite of the sabbatical ... asked about the new The Design of Everyday Things 1.4 Plate Mounted Over the Dial of the Telephones at the University of Michigan These inadequate instructions are all that most users see (The button...

Ngày tải lên: 26/05/2014, 07:46

... Design of Everyday Things • It examines the effect of poor design and equipment failure on human behavior • It covers user-centered design, on everyday things and on everyday actions Design of ... Homework The purpose of this assignment is to give you a bit of practice with the material presented in the first week of the class - the design of everyday things * find a vending ... Example: Thermostat • Will a room or oven heat (or cool) faster if the thermostat is turned all the way to the maximum setting? Thermostat • Two 'folk' theories of thermostats • timer theory - thermostat...

Ngày tải lên: 10/05/2015, 14:31

... roughening of the surfaces (increased running noise) Work end Bearing dimensioning The size of the bearings is dictated by the shaft diameter, which in turn is based on the anticipated vibrations The ... in the rolling gap In order to still achieve the thickness tolerances of the sheets in the micrometer range, the deflection is compensated for by inclining of rolls and and by counterbending of ... this end The two spindle bearings FAG B7030E.T.P4S.UL are mounted in O arrangement The bearings of the UL universal design are lightly preloaded by clamping the inner rings axially The bearing...

Ngày tải lên: 23/01/2014, 04:20

... this, the computer has also been identified and treated as a central and most essential issue These are the issues that are at the core of the contents of this volume This set of volumes consists of ... this volume clearly reveal the effectiveness and great significance of the techniques available and, with further development, the essential role that they will play in the future I hope that practitioners, ... established their importance in such decision-making problems It is, therefore, no surprise that there is a considerable number of papers in the literature devoted to the problem of long-range...

Ngày tải lên: 11/08/2014, 05:22

... measures of layout flexibility and compare the usefulness and limitations of each We also examine the relationship between factory layout and material handling and show that the realization of layout ... depends on the configuration of the material handling system Finally, we present an integrated procedure for flexible layout design in stochastic environments We use the procedure to highlight the desirability ... facilities must be designed with enough flexibility to withstand significant changes in their operating requirements The shortening of product life cycles and the increased variety in product offerings...

Ngày tải lên: 11/08/2014, 05:22

... Underlying Resource Allocation System (RAS) and the RAS Taxonomy • The Nature of the RAS Deadlock and Generic Resolution Approaches • Literature Review of the FMS Deadlock Problem • Developing Correct ... automation of the underlying production systems However, even though a great deal of work has been done to facilitate manufacturing automation at the hardware component level, currently there is ... Deadlock Avoidance Policies for Contemporary FMS 4.3 The Single-Unit RAS and the Deadlock Avoidance Problem The Single-Unit RAS • Structural Analysis of the Single-Unit RAS • An Algebraic FMS State-Safety...

Ngày tải lên: 11/08/2014, 05:22

Ngày tải lên: 23/03/2014, 05:22

... each of these metrics is optionally a component of the VM, the end-point monitor can keep statistics on the components that are in VM Together with the vector of weights, these statistics allow the ... improving the latency of the other branch will have no observable effect at the output) In the case that no information is available from the end point monitor concerning the source of the problem, then ... segments along these four dimensions, which indicates the relative importance of each of these components to the end-point QoS The most interesting of these dimensions, lifetime, is the mechanism...

Ngày tải lên: 27/06/2014, 23:20

... in the length of the rental, which of course is data from the rental The method effectively uses two pieces of data, the length of the rental and the type of the movie Why I prefer to pass the ... see, I run them often An important part of the tests is the way they report their results They either say "OK," meaning that all the strings are identical to the reference strings, or they print ... code written in the customer class They can easily be added to the interface of the class should other parts of the system need this information Without queries like these, other methods have...

Ngày tải lên: 01/08/2014, 09:20

... in the rolling gap In order to still achieve the thickness tolerances of the sheets in the micrometer range, the deflection is compensated for by inclining of rolls and and by counterbending of ... »200,000 »200,000 The effects of basing the bearing dimensions on attainable life become evident in the case of the two bearings dimensioned for the least load carrying capacity: the spherical roller ... location 3) at the coupling end of the input shaft and the spherical roller thrust bearing 29464E (bearing location 9) at the output end of the output shaft 28: Bearing arrangement of a marine gear...

Ngày tải lên: 11/08/2014, 05:22

... sheaves of a passenger ropeway 75 Rope sheave (underground mining) These sheaves are arranged in the head frames of the pits The rope fastened to the cage runs from the drive sheave or the drum of the ... The pillar of the crane described is attached to the ship The slewing gantry with the crane superstructure is supported on the crane pillar The bearing mounting has to take up the weight of the ... dimensioning The thrust load, consisting of the weight of the slewing superstructure and the payload, is much higher than the radial load resulting from the tilting moment and wind pressure Therefore, the...

Ngày tải lên: 11/08/2014, 05:22

... side, design AL), the other one as the locating bearing (continuous shaft, design BF) The unsplit housings of series BNM were developed especially for hammer mills and crushers They were designed ... value Frmin during one revolution of the eccentric shafts For calculation of these loads, the distance R between the centres of gravity of imbalance weight and the pertinent bearing axes is required ... dimensioning The dimensioning of the drum bearings is based on half the weight of the loaded drum (400/2 · 9.81 = 1,962 kN) The shock loads are taken into account by a shock factor fz = 1.5 The required...

Ngày tải lên: 11/08/2014, 05:22

... movement between the bearing rings) The term "static", therefore, relates to the operation of the bearings but not to the effects of the load The magnitude and direction of the load may change ... a way that the pressure cone apex of the left-hand bearing points to the left and the pressure cone apex of the right-hand bearing points to the right With the O arrangement one of the bearing ... effect of the load but rather to the operating condition of the bearing The magnitude and direction of the load can remain constant When calculating the bearings, a dynamic stress is assumed when the...

Ngày tải lên: 11/08/2014, 05:22

... sheaves of a passenger ropeway 75 Rope sheave (underground mining) These sheaves are arranged in the head frames of the pits The rope fastened to the cage runs from the drive sheave or the drum of the ... The pillar of the crane described is attached to the ship The slewing gantry with the crane superstructure is supported on the crane pillar The bearing mounting has to take up the weight of the ... dimensioning The thrust load, consisting of the weight of the slewing superstructure and the payload, is much higher than the radial load resulting from the tilting moment and wind pressure Therefore, the...

Ngày tải lên: 13/08/2014, 05:21

... 2007 15:15 The frontiersmen of mankind the liberation of their continent made the second half of the twentieth century a triumphant period for the peoples of Africa, but at the end of the century ... components of the economy at Birimi, a settlement close to the northern edge of the West African forest in modern Ghana This was an outlier of the Kintampo culture whose other sites, further south in the ... while others moved more quickly up the main waterways until, at about 1000 bc, they reached the eastern edge of the equatorial forest in the broad area of the great East African lakes There they...

Ngày tải lên: 21/09/2012, 10:39

... And for the most part, the initiators of totalitarian rule pursued their aims in the name of some grand moral imperative – the Aryan domination of the sub-human races of the world or the Wnal ... to political agents on the basis of the perceived merits of the values and ends they serve and of their practical Wdelity in pursuing them It is only thus that the breed of ‘‘scurvy politicians’’ ... The honor of politicians having so often proved as hollow as their promises, their reputation as a class has frequently tended to fall, like the salesman’s, to the level of the scoundrel or the...

Ngày tải lên: 21/09/2012, 11:00

... below the active soil zone Expansive soils are most prevalent on the Atlantic and Gulf coastal plain and in some areas of the central and western United States Photograph of the construction of the ... Increase of stress under the center of a flexibly loaded rectangular area Therefore, the average pressure increase in the clay layer is, ∆qavg = (92.3 + 4(78.8) + 69.8) = 79 psf The pressure po at the ... 11,000 kN Step Find the soil pressures at the mat invert Find the centroid of the column loads (location of the resultant R) with respect to a new x’y’ coordinate system located at the lower left...

Ngày tải lên: 16/10/2012, 10:43

... in the interior of Ω, is in Hs (B) The proofs of both of these Lemmas are rather technical The idea is to use powers of the operator ˆ Λs = [I − (2π)−2 ]s/2 f (ξ), and the fact that under the ... another Section 2.1.3 relates these Sobolev spaces to elliptic operators by proving the basic elliptic estimate, one of the keys to the proof of the invariance of the index Section 2.2 applies the ... discusses the Riemannian metric and inner products Finally section 3.3 combines the results of sections and to conclude the proof of the invariance of the index of an elliptic operator The paper...

Ngày tải lên: 13/12/2013, 14:15

... sorts of delicious expeditions, and they would make a world of fun of him for having to work - the very thought of it burnt him like fire He got out his worldly wealth and examined it bits of ... intervals, followed by a deep-toned ding-dong-dong, ding-dong-dong, for he was personating a steamboat As he drew near, he slackened speed, took the middle of the street, leaned far over to star-board ... them considerable money; but if they were -34- offered wages for the service, that would turn it into work and then they would resign The boy mused awhile over the substantial change which had...

Ngày tải lên: 15/12/2013, 07:15

... know." "Then art thou indeed that famous outlaw? Right gladly will I dispute with thee the passes of the merry wood Have at thee!" They took their lath swords, dumped their other traps on the ground, ... more The last repetition was successful The two marbles lay within a foot of each other Just here the blast of a toy tin trumpet came faintly down the green aisles of the forest Tom -96- flung off ... and then opened the place with the incantation he had just used, you would find that all the marbles you had ever lost had gathered themselves together there, meantime, no matter how widely they...

Ngày tải lên: 24/12/2013, 14:16