inferring activity time in news

Ngày tải lên: 31/03/2014, 00:20

... setInterval() action, use the following syntax: clearInterval(myInterval); Using the syntax shown, you can initiate the setInterval() action at any time, calling any function. < Day ... following example: var myInterval:Object = setInterval(rotateClip, 1500); This example assigns the name myInterval to the setInterval() action. To remove the functionality of the setInterval() ... the setInterval() action: setInterval (updateMessageFunction, 20000, "Hello", arg2, arg3) A setInterval() action can be turned on and off by assigning a variable name, as in the...

Ngày tải lên: 20/10/2013, 14:15

Ngày tải lên: 26/11/2013, 13:24

Ngày tải lên: 26/11/2013, 13:25

Ngày tải lên: 18/12/2013, 10:03

Ngày tải lên: 21/12/2013, 13:00

... data in which none of that is necessary, a world in which all pipeline datasets are contained in the single table that is their destination or their point of origin. In this world, maintaining ... systems used in education, finance, health care, insurance, manufacturing, retailing and transportation—all industries in which the authors have had consulting experience. In using these methods, ... along inflow pipelines, and posted transactions as data destined for some kind of logfile, and as moving towards that destination along outflow pipelines. So if we can bring pending transactions into...

Ngày tải lên: 24/12/2013, 02:16

... management losing faith in data warehouse projects. As these large projects fell increasingly behind schedule and rose increasingly over budget— something large projects tend to do—the pressure increased to ... into the business IT commu- nity, bi-temporality was understood as a distinction between logical time and physical time. Logical time, corresponding to what computer scientists called valid time, ... bi-temporality. For while it acknowl- edged that one kind of time is a period of time, it believed that the other kind of time is a point in time. With only one temporal extent represented, this...

Ngày tải lên: 24/12/2013, 02:16

... point in time forward to the point in time we are interested in. But the defining feature of reconstructable methods is not the movement of data from off-line to on-line storage. The defining ... any point in time between the starting balance and the current bal- ance by going back to the starting balance and applying trans- actions, in chronological sequence, up to the desired point. We ... waiting for the data, and the decisions delayed until the data becomes available. In an increasingly fast-paced business world, the opportunity cost of delays in accessing data is increasingly...

Ngày tải lên: 24/12/2013, 02:16

... lacking a standard for the PERIOD datatype, we will continue the practice of defining periods of time in terms of their begin and end points in time. Chapter 3 THE ORIGINS OF ASSERTED VERSIONING: ... record of when business events happen in the real world. In addition, for most business purposes, we assume that a SQL timestamp plus a defined interval of time will result in a second timestamp that ... designing and maintaining data models that must explicitly define temporal data structures and integrity constraints on them. It also relieves developers of the burden of designing, writing and maintaining...

Ngày tải lên: 24/12/2013, 02:16

... whether a point in time is or is not contained in a period of time. Where P and T are, respectively, a point in time and a period of time, and T 1 and T 2 are dates delimiting T using the closed-open ... [aligns] with the time period, then it either [starts] the time period or [finishes] it. Otherwise, the point in time occurs [during] the time period. If the point in time [ excludes] the time period, ... clock ticks. This point in time may either [ intersect] or [exclude] the time period. If the point in time [ intersects] the time period, it also [fills] and [ occupies] that time period. If it...

Ngày tải lên: 24/12/2013, 02:16

... point in time 1 All effective time relationships exist within shared assertion time. Because this is so important to keep in mind, we will often add the qualifier “within shared assertion time ... Versioning In this variation on versioning, a logical delete flag is included in the version table. It has two values, one marking the row as not being a delete, and the other marking the row as being ... VERSIONING 97 for version tables—a time period which we call assertion time, and computer scientists call transaction time effective time versioning adds a single date. Next, instead of adding this...

Ngày tải lên: 24/12/2013, 02:16

... truth. Temporal Integrity Constraints The three integrity constraints in relational theory are entity integrity, referential integrity and domain integrity. Entity integ- rity insures that the ... effective time than assertion time, we also present an in- line notation for single asserted Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00006-6 Copyright # 2010 Elsevier Inc. ... either assertion time or effective time on their insert, update or delete transactions, it will seem to them that they are maintaining data in a conventional table. This maintenance is not done by writing SQL...

Ngày tải lên: 24/12/2013, 02:16

... assertion time and effective time is that two or more effective -time [ intersecting] versions of the same object, in shared assertion time, would vio- late temporal entity integrity, making conflicting ... repre- sentation of a timeline and a snapshot of effective time periods, grouped by common assertion times along that timeline. With the in- line notation, that context, too, is not represented. Viewing the ... within shared assertion time, even a single effective -time clock tick included in another version of that object already in the table. Most physical transactions against bi-temporal tables are inserts....

Ngày tải lên: 24/12/2013, 02:16

... against non-temporal tables insert, update or delete individual rows representing objects, transactions against asserted version tables insert into a period of time, update within a period of time, ... SCENARIO 153 PART 3 DESIGNING, MAINTAINING AND QUERYING ASSERTED VERSION DATABASES Chapter Contents 8. Designing and Generating Asserted Versioning Databases 167 9. An Introduction to Temporal ... effective on that same date. 3 At this point in time, the episode consi sts of a single version with an effective time period beginning in January 2010 and extending to 12/31/9999. Because the effective...

Ngày tải lên: 21/01/2014, 08:20

... that each business key points to one and only one object by defining a unique index on it. Nor can we simply extend the scope of the index by defin- ing a unique index on the business key plus ... bigint eff_beg_dt: datetime asr_beg_dt: datetime wellpgmcat_oid: bigint eff_beg_dt: datetime eff_end_dt: datetime asr_end_dt: datetime row_crt_dt: datetime client_wellpgm_oid: bigint eff_beg_dt: datetime asr_beg_dt: ... that correspond to rows in a conventi onal table of persistent objects. 164 Part 3 DESIGNING, MAINTAINING AND QUERYING ASSERTED VERSION DATABASES In this chapter, we focus on index design, although...

Ngày tải lên: 21/01/2014, 08:20

... significantly reduces the work involved in maintaining temporal data, and will eliminate the errors that would otherwise inevitably happen as temporal data is maintained. Using a framework like the ... taxonomy in terms of its topology. On a line representing a timeline, we can place a line segment representing an episode. We can also remove a line segment from that line. Given a line segment, ... continuously represented, in current assertion time, from the effective -time beginning of that version’s episode to the effective -time end of that version. Since the parent managed object in a...

Ngày tải lên: 21/01/2014, 08:20

... effective time it affects. As a relationship between a point in time and a period of time, the basic options are that the point in time can be earlier than the period of time, within the period of time, ... will continue on, and will update the database. In doing so, it will begin by preserving the original state of the version or versions about to be changed, doing this by withdrawing them into past ... shown in Figure 10.3. Episode C, as we have labeled it, is a single-version episode. Of course all episodes, when initially created, are single-version episodes. Using the in- line notation introdu...

Ngày tải lên: 21/01/2014, 08:20

... always ends the assertion time period of the version it supercedes, withdrawing that original version into past assertion time. Consequently, since temporal integrity constraints apply only among ... 2012, into the indefinite future. The first physical transaction step in this deletion is to with- draw versions 9 and 4 since each of them has at least one clock tick included in the timespan ... or partially included within its timespan. If one version is partially within the timespan, the temporal delete will replace the part of that withdrawn version not within its timespan. In either...

Ngày tải lên: 21/01/2014, 08:20