Indexing Mobile Objects

2011 ◽  
pp. 594-599
Author(s):  
Panayiotis Bozanis
Keyword(s):  
Communication Systems ◽  
Moving Objects ◽  
Database Systems ◽  
Short Review ◽  
Function Parameter ◽  
Application Development ◽  
Mobile Objects ◽  
Military Equipment ◽  
The Past ◽  
Mode Of Operation

The past few years have shown a significant increase in the volume and diversity of data stored in database management systems. Among these are spatiotemporal data, one of the faster developing categories of data. This phenomenon can be attributed to the flurry of application development concerning continuously evolving spatial objects in several areas: mobile communication systems, military equipment in battlefields, air traffic, truck fleets, and others. In standard database applications, data remain unchanged unless an update is explicitly stated. Applying this mode of operation to constantly moving objects would require frequent updates to be performed; otherwise, the database would be inaccurate and unreliable. In order to capture continuous movement and to avoid unnecessary updates, object positions are stored as time-dependent functions, requiring updates only when a function parameter changes. The moving objects are considered responsible for updating the database about alterations in their movement. In the following article is a short review on basic indexing schemes for accommodating moving objects in database systems so that complex queries about their location in the past, present, and future can be served.

ON "PLASTIC" WAVES IN SOLIDS

1959 ◽  
Vol 37 (9) ◽  
pp. 1017-1035 ◽  
Author(s):  
John M. Bowsher
Keyword(s):  
Theoretical Study ◽  
Short Review ◽  
Future Research ◽  
Past Work ◽  
The Past ◽  
Engineering Significance ◽  
The Subject

The study of the propagation of "plastic" waves in solids has reached a stage where it is necessary to consider which direction future research should take. In the past 90 or so years many experiments, mostly designed to elucidate certain points of engineering significance, and a few attempts at a theoretical study have cast some light on the subject and revealed it as one of formidable difficulty.Nearly all the experiments have of necessity relied on rather dubious theories for their interpretation, and part of the present paper will be devoted to a description of an apparatus which gives results capable of being interpreted with a very minimum of theory. The remainder of the paper is devoted to a short review of past work with particular emphasis on basic phenomena and to a brief discussion on the most pressing problems still remaining. The experiments described in the present paper bring to light a factor in the propagation of "plastic" waves that seems to have been overlooked in previous work.

scholarly journals Brief structural insight into the allosteric gating mechanism of BK (Slo1) channel

2019 ◽  
Vol 97 (6) ◽  
pp. 498-502
Author(s):  
János Almássy ◽  
Péter P. Nánási
Keyword(s):  
Quaternary Structure ◽  
Short Review ◽  
Bk Channel ◽  
The Past ◽  
Gating Model ◽  
Cryo Electron Microscopy ◽  
Gating Mechanism ◽  
Electrophysiological Measurements ◽  
Structural Insight ◽  
Insight Into

The big conductance Ca2+-dependent K+ channel, also known as BK, MaxiK, Slo1, or KCa1.1, is a ligand- and voltage-gated K+ channel. Although structure-function studies of the past decades, involving mutagenesis and electrophysiological measurements, revealed fine details of the mechanism of BK channel gating, the exact molecular details remained unknown until the quaternary structure of the protein has been solved at a resolution of 3.5 Å using cryo-electron microscopy. In this short review, we are going to summarize these results and interpret the gating model of the BK channel in the light of the recent structural results.

Indexing the past, present, and anticipated future positions of moving objects

2006 ◽  
Vol 31 (1) ◽  
pp. 255-298 ◽  
Author(s):  
Mindaugas Pelanis ◽  
Simonas Šaltenis ◽  
Christian S. Jensen
Keyword(s):  
Moving Objects ◽  
The Past

Some Aspects of S.S.T. Operations in Non-optimum Conditions

1966 ◽  
Vol 19 (3) ◽  
pp. 324-330
Author(s):  
P. S. Cole
Keyword(s):  
Short Review ◽  
Relative Cost ◽  
Optimum Conditions ◽  
The Past ◽  
Cost Penalty

Over the past few years, numerous papers have been written concerning various aspects of S.S.T. operations, the majority dealing with one or two facets. This short review considers those aspects which are of major importance when the S.S.T. is operated in non-optimum conditions and an attempt is made to indicate the relative cost penalty caused by the phenomena discussed, the performance in smooth standard conditions being taken as the datum. Little of the information presented is new and most of the points mentioned are considered in greater detail in the references. (Crown copyright, reproduced with the permission of H.M.S.O.)

scholarly journals Minimization in Cooperative Response to Failing Database Queries

1997 ◽  
Vol 06 (02) ◽  
pp. 95-149 ◽  
Author(s):  
Parke Godfrey
Keyword(s):  
Optimal Algorithm ◽  
Simple Algorithm ◽  
Search Space ◽  
Database Systems ◽  
Identification Problems ◽  
Database Queries ◽  
The Past ◽  
Cause Of Failure ◽  
Algorithmic Approaches ◽  
Answer Set

When a query fails, it is more cooperative to identify the cause of failure, rather than just to report the empty answer set. When there is not a cause per se for the query's failure, it is then worthwhile to report the part of the query which failed. To identify a Minimal Failing Subquery (MFS) of the query is the best way to do this. (This MFS is not unique; there may be many of them.) Likewise, to identify a Maximal Succeeding Subquery (XSS) can help a user to recast a new query that leads to a non-empty answer set. Database systems do not provide the functionality of these types of cooperative responses. This may be, in part, because algorithmic approaches to finding the MFSs and the XSSs to a failing query are not obvious. The search space of subqueries is large. Despite work on MFSs in the past, the algorithmic complexity of these identification problems had remained uncharted. This paper shows the complexity profile of MFS and XSS identification. It is shown that there exists a simple algorithm for finding an MFS or an XSS by asking N subsequent queries, in which N is the length of the query. To find more MFSs (or XSSs) can be hard. It is shown that to find N MFSs (or XSSs) is NP-hard. To find k MFSs (or XSSs), for a fixed k, remains polynomial. An optimal algorithm for enumerating MFSs and XSSs, ISHMAEL, is developed and presented. The algorithm has ideal performance in enumeration, finding the first answers quickly, and only decaying toward intractability in a predictable manner as further answers are found. The complexity results and the algorithmic approaches given in this paper should allow for the construction of cooperative facilities which identify MFSs and XSSs for database systems. These results are relevant to a number of problems outside of databases too, and may find further application.

Reinforcement of the NATO Eastern Flank

2020 ◽  
pp. 153-179
Author(s):  
Przemysław Furgacz
Keyword(s):  
Eastern Europe ◽  
Eastern European ◽  
Baltic States ◽  
Military Equipment ◽  
Eastern Flank ◽  
The Past ◽  
Security Environment ◽  
Military Presence ◽  
Hybrid War ◽  
The Baltic

After the landmark annexation of Crimea and eruption of hybrid war in the Donbas, some states that in the past used to be under Soviet domination began to ask their stronger NATO allies for increased military presence in the Alliance Eastern flank. The worsening security environment in the Eastern Europe, the fear against potential swift Russian incursion, the relative weakness of Eastern European armies, the significant strategic exposure of the Baltic states, these factors influenced the Alliance's decision to augment NATO military presence in the states bordering Russia. Actions like deployment of additional battalions, prepositioning of heavy military equipment, intensified joint multinational military drills are intended to reassure the most vulnerable NATO member states and to deter Moscow from taking too audacious and too assaultive measures. The author shortly describes the actions NATO has made since 2014 in order to strengthen its military presence in the Eastern flank with particular emphasis on U.S.-enhanced forward presence in the region.

Using the Wii Remote for Mobile Device Application Testing

2015 ◽  
Vol 6 (1) ◽  
pp. 34-43
Author(s):  
Mark Bruce Freeman
Keyword(s):  
Mobile Devices ◽  
User Experience ◽  
Development Process ◽  
Primary Source ◽  
Proof Of Concept ◽  
Application Development ◽  
The Past ◽  
Phone Calls ◽  
Innovative Method ◽  
Dramatic Shift

There has been a dramatic shift in the interaction methods of mobile devices over the past decade. From devices simply being able to make phone calls to being able to handle complex tasks traditionally performed on personal computers (PCs); this change has led to new interaction issues that need to be understood during the application development process, particularly as these devices now commonly incorporate a touch-screen as their primary source of input. Currently, the methods of conducting software user experience testing of these devices employs techniques that were developed for PCs, however mobile devices are used within different contexts of use. This research initially reviews the current methods for user experience testing of applications running on mobile devices and then presents, through a proof-of-concept approach, an innovative method for conducting user experience testing employing actual devices.

scholarly journals Research journey of respirasome

2020 ◽  
Vol 11 (5) ◽  
pp. 318-338 ◽  
Author(s):  
Meng Wu ◽  
Jinke Gu ◽  
Shuai Zong ◽  
Runyu Guo ◽  
Tianya Liu ◽  
...  
Keyword(s):  
Short Review ◽  
Research Field ◽  
Atomic Scale ◽  
Inner Mitochondrial Membrane ◽  
Macroscopic Scale ◽  
The Past ◽  
Transport Chain ◽  
High Resolution Structure ◽  
New Perspective ◽  
Resolution Structure

AbstractRespirasome, as a vital part of the oxidative phosphorylation system, undertakes the task of transferring electrons from the electron donors to oxygen and produces a proton concentration gradient across the inner mitochondrial membrane through the coupled translocation of protons. Copious research has been carried out on this lynchpin of respiration. From the discovery of individual respiratory complexes to the report of the high-resolution structure of mammalian respiratory supercomplex I1III2IV1, scientists have gradually uncovered the mysterious veil of the electron transport chain (ETC). With the discovery of the mammalian respiratory mega complex I2III2IV2, a new perspective emerges in the research field of the ETC. Behind these advances glitters the light of the revolution in both theory and technology. Here, we give a short review about how scientists ‘see’ the structure and the mechanism of respirasome from the macroscopic scale to the atomic scale during the past decades.

University Startup Accelerators: Startup Launchpads or Vehicles for Entrepreneurial Learning?

2020 ◽  
pp. 251512742093175
Author(s):  
Lynn E. Metcalf ◽  
Thomas M. Katona ◽  
Jonathan L. York
Keyword(s):  
Return On Investment ◽  
Future Research ◽  
Uniform Structure ◽  
Primary Role ◽  
Entrepreneurial Ecosystem ◽  
The Past ◽  
Mode Of Operation ◽  
The University ◽  
Insight Into

Over the past decade, universities have invested heavily in startup accelerator programs; however, their role in the university entrepreneurial ecosystem is ambiguous. Are university startup accelerators intended to educate or are they created to facilitate business starts and to contribute to regional economic development? In contrast, most private-sector startup accelerators serve a consistent and differentiated role in the entrepreneurial ecosystem—they provide programming and resources to startups to increase the probability of a return on investment. Understanding the role of university startup accelerators is an important precursor to evaluating their impact and whether or not the return is worth the considerable investment. In this study, we poll university accelerator directors to gain their perspective on the role(s) that university startup accelerators play and to identify how they are structured and operated. Our research reveals a fairly uniform structure and mode of operation. While facilitating business starts is a key role for some, it confirms education as the primary role for university startup accelerators. We outline appropriate means of assessing the learning that takes place in accelerator programs, offer insight into how these findings can help accelerator directors deliver on outcomes and demonstrate impact, and propose avenues for future research.

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