HR-Net - Hellenic Resources Network Compact version
Today's Suggestion
Check our bulletin board of Hellenic Public Events
HomeAbout HR-NetNewsWeb SitesDocumentsOnline HelpUsage InformationContact us
Monday, 23 October 2017
 
News
  Latest News (All)
     From Greece
     From Cyprus
     From Europe
     From Balkans
     From Turkey
     From USA
  Announcements
  World Press
  News Archives
Web Sites
  Hosted
  Mirrored
  Interesting Nodes
Documents
  Special Topics
  Treaties, Conventions
  Constitutions
  U.S. Agencies
  Cyprus Problem
  Other
Services
  Personal NewsPaper
  Greek Fonts
  Tools
  F.A.Q.
 

VLDB'97 Conference in Athens

Conferences in and about Greece Directory - Previous Article - Next Article

From: "HR-Net News Distribution Manager" <dist@hri.org>

Originally From: root@mhs-gw.gsrt.epmhs.gr

What follows is the complete information regarding VLDB 97 which will take place in Athens. More information is also available on http://www.dbnet.ece.ntua.gr/VLDB97

LOOKING FORWARD TO SEEING YOU ALL IN ATHENS THIS AUGUST!!

Timos Sellis, Chair of the VLDB 97 Organizing Committee.


About VLDB 1997
Conference History

For 23 years, VLDB has served the database community as its major truly international conference all over the world. Each year the conference is held in a different location. In the recent past, VLDB conferences have been held in locations such as Bombay, India (1996), Zurich, Switzerland (1995), Santiago, Chile (1994), Dublin, Ireland (1993), Vancouver, Canada (1992), Barcelona, Spain (1991) and Brisbane, Australia (1990).

From an arena where just research results are presented, VLDB has evolved to a forum where researchers and practitioners exchange ideas and experiences, without sacrificing quality ensured by rigorous refereeing. The VLDB '97 conference will continue and strengthen this trend.


Conference Highlights
The conference will cover several tracks.

* Research Track. A high-quality scientific program consisting of the presentations of the best in recent research, selected from a large submission from leading researchers across the world. * Tutorials. Tutorials on challenging developments in databases conducted by leading scientists. These are targeted at practitioners as well as researchers. * Invited Talks. Invited talks are given by leading persons in the field illuminating recent trends, and in some cases providing enlightening retrospective accounts as well. * Industry and Applications Track. Industrial sessions identifying problems and describing solutions from a practical point of view. Experts from the leading database companies take part in these sessions. * Panel Discussions. These provide a forum for industry and academic experts to discuss current issues in database technology.


Contact Information
For further information, please send email to vldb97@dbnet.ece.ntua.gr, check the Web Site http://www.dbnet.ece.ntua.gr/VLDB97/ or contact the VLDB Secretariat at the following address:

VLDB Secretariat (c/o Prof. Timos Sellis) Department of Electrical and Computer Engineering National Technical University of Athens Zografou 15773, Athens GREECE


Conference Program Outline

Time |Room 1 |Room 2 |Room 3
Tuesday, August 26
08:30 |Registration
09:00 - 10:30 |TUTORIAL 1 |TUTORIAL 2 | |Data |GIS | |Warehousing | |
10:30 - 11:00 |Coffee Break
11:00 - 12:30 |TUTORIAL 1 |TUTORIAL 2 | | (cont.) | (cont.) |
12:30 - 14:00 |Lunch Break
14:00 - 15:30 |TUTORIAL 3 |TUTORIAL 4 | |Obj.-Relational|Visual Data | |DB Systems |Mining |
15:30 - 16:00 |Coffee Break
16:00 - 17:30 |TUTORIAL 3 |TUTORIAL 4 | |(cont.) |(cont.) |
20:00 - 23:00 |Welcome Reception
20:00 |Registration
Wednesday, August 27
08:30 |Registration
09:00 - 09:30 |OPENING CEREMONY
09:30 - 10:30 |KEYNOTE SPEECH 1
10:30 - 11:00 |Coffee Break
11:00 - 12:30 |Res. Sess. 1 |Res. Sess. 2 |Ind. Sess. 1 |Data |Novel Data |System |Warehousing |Types |Experiences
12:30 - 14:00 |Lunch Break
14:00 - 15:30 |Res. Sess. 3 |Res. Sess. 4 |Ind. Sess. 2 |Transactions & |Multidimension.|Application |Reliability |Databases |Challenges
15:30 - 16:00 |Coffee Break
16:00 - 17:30 |Res. Sess. 5 |Res. Sess. 6 |Res. Sess. 7 |Database Design|Data Mining |Web Databases
Thursday, August 28
09:00 - 10:30 |TUTORIAL 5 |Res. Sess. 6 |Res. Sess. 7 |Workflow |Tertiary |Heterogeneous |Management |Storage |Databases
10:30 - 11:00 |Coffee Break
11:00 - 12:30 |TUTORIAL 5 |Res. Sess. 10 |Res. Sess. 11 |(cont.) |Query |Distributed | |Optimization |Databases
12:30 - 14:00 |Lunch Break
14:00 - 15:30 |TUTORIAL 6 |Res. Sess. 12 |Ind. Sess. 3 |Multimedia |Database |Research |Databases |Algorithms |Visions
15:30 - 16:00 |Coffee Break
16:00 - 17:30 |TUTORIAL 6 |Res. Sess. 13 |Panel Sess. 1 |(cont.) |Sorts & Joins |TBA
17:45 - 18:45 |10 YEAR AWARD TALK
20:00 - 23:00 |CONFERENCE BANQUET
Friday, August 29
08:30 - 10:00 |Res. Sess. 14 |Res. Sess. 15 |Ind. Sess. 4 |Spatial Access |Querying & |Industry |Methods |Browsing |Solutions
10:00 - 10:15 |Coffee Break
10:15 - 11:15 |KEYNOTE SPEECH 2
11:30 - 13:00 |Res. Sess. 16 |Res. Sess. 17 |Panel Sess. 2 |Query |Multimedia |TBA |Processing |Databases |
13:00 - 14:00 |CLOSING CEREMONY
Opening Ceremony
Wednesday, August 27, 09:00 - 09:30 Keynote Speaker: TBA

Tutorials


Tutorial 1: The Ins and Outs (and everything in between) of Data Warehousing Donovan Schneider Tuesday, August 26, 09:00 - 12:30, Room 1

Tutorial 2: Geographic Information Systems Hanan Samet Tuesday, August 26, 09:00 - 12:30, Room 2

Tutorial 3: Object-Relational Database Systems - Principles, Products, and Challenges Krishna Kulkarni, Nelson Mattos, Anil K. Nori Tuesday, August 26, 14:00 - 17:30, Room 1

Tutorial 4: Visual Data Mining Daniel A. Keim Tuesday, August 26, 14:00 - 17:30, Room 2

Tutorial 5: Workflow Management - From Business Process Automation to Inter-Organizational Collaboration Dimitrios Georgakopoulos, Marek Rusinkiewicz Thursday, August 28, 09:00 - 12:30, Room 1

Tutorial 6: Multimedia Databases Stavros Christodoulakis Thursday, August 28, 14:00 - 17:30, Room 1

Research Sessions


Research Session 1: Data Warehousing
Wednesday, August 27, 11:00 - 12:30, Room 1

Incremental Organization for Data Recording and Warehousing H.V. Jagadish, P.P.S. Narayan, S. Seshadri, S. Sudarshan, R. Kanneganti

Multiple-View Self-Maintenance in Data Warehousing Environments. N. Huyn

Recovering Information from Summary Data C. Faloutsos, H.V. Jagadish, N.D. Sidiropoulos

Research Session 2: Novel Data Types


Wednesday, August 27, 11:00 - 12:30, Room 2

A Language for Manipulating Arrays A. P. Marathe, K. Salem

Implementing Abstract Objects with Inheritance in Datalog-neg H. M. Jamil

The Case for Enhanced Abstract Data Types P. Seshadri, M. Livny, R. Ramakrishnan

Research Session 3: Transactions and Reliability


Wednesday, August 27, 14:00 - 15:30, Room 1

Integrating Reliable Memory in Databases W. T. Ng, P. M. Chen

Logical and Physical Versioning in Main Memory Databases P. Bohannon, D. Leinbaugh, R. Rastogi, S. Seshadri, A. Silbershatz, S. Sudarshan

Using Versions in Update Transactions : Application to Integrity Checking

F. Llirbat, E. Simon, D. Tombroff

Research Session 4: Multidimensional Databases


Wednesday, August 27, 14:00 - 15:30, Room 2

A Foundation for Multi-dimensional Databases M. Gyssens, L. V.S. Lakshmanan

Data Warehouse Configuration D. Theodoratos, T. Sellis

Fast Computation of Sparse Datacubes K. A. Ross, D. Srivastava

Research Session 5: Database Design


Wednesday, August 27, 16:00 - 17:30, Room 1

Algorithms for Materialized View Design in Data Warehousing Environment J. Yang, K. Karlapalem, Q. Li

An Efficient Cost-Driven Index Selection Tool for Microsoft SQL Server S. Chaudhuri, V. Narasayya

Materialized Views Selection in a Multidimensional Database E. Baralis, S. Paraboschi, E. Teniente

Research Session 6: Data mining


Wednesday, August 27, 16:00 - 17:30, Room 2

Efficient Construction of Regression Trees with Range and Region Splitting Y. Morimoto, H. Ishii, S. Morishita

Parallel Algorithms for High-dimensional Similarity Joins for Data Mining Applications J. C. Shafer, R. Agrawal

STING: A Statistical Information Grid Approach to Spatial Data Mining W. Wang, J. Yang, R. Muntz

Research Session 7: Web Databases


Wednesday, August 27, 16:00 - 17:30, Room 3

Merging Ranks from Heterogeneous Internet Sources L. Gravano, H. Garcia-Molina

To Weave the Web P. Atzeni, G. Mecca, P. Merialdo

Using Probabilistic Information in Data Integration D. Florescu, D. Koller, A. Levy, A. Pfeffer

Research Session 8: Tertiary Storage


Thursday, August 28, 09:00 - 10:30, Room 2

On-Demand Data Elevation in Hierarchical Multimedia Storage Servers P. Triantafillou, T. Papadakis

Principles of Optimally Placing Data in Tertiary Storage Libraries S. Christodoulakis, P. Triantafillou, F. Zioga

Vertical Data Migration in Large Near-Line Document Archives Based on Markov-Chain Predictions A. Kraiss, G. Weikum

Research Session 9: Heterogeneous Databases


Thursday, August 28, 09:00 - 10:30, Room 3

Describing and Using the Query Capabilities of Heterogeneous Sources V. Vassalos, Y. Papakonstantinou

Don't Scrap It, Wrap It! A Wrapper Architecture for Legacy Data Sources M. Tork Roth, P. Schwarz

Optimizing Queries Across Diverse Data Sources L. Haas, D. Kossmann, E. Wimmers, J. Yang

Research Session 10: Query Optimization


Thursday, August 28, 11:00 - 12:30, Room 2

Optimizing Queries with Universal Quantification in Object-Oriented and Object-Relational Databases J. Claussen, A. Kemper, G. Moerkotte, K. Peithner

Parallel Query Scheduling and Optimization with Time- and Space-Shared Resources M. N. Garofalakis, Y. E. Ioannidis

The Complexity of Transformation-Based Join Enumeration A. Pellenkoft, C. Galindo Legaria, M. Kersten

Research Session 11: Distributed Databases


Thursday, August 28, 11:00 - 12:30, Room 3

1-Safe Algorithms for Symmetric Site Configurations R. Humborstad, M. Sabaratnam, S. O. Hvasshovd, O. Torbjornsen

Adaptive Data Broadcast in Hybrid Networks K. Stathatos, N. Roussopoulos, J. Baras

Finding Data in the Neighborhood A. Eickler, A. Kemper, D. Kossmann

Research Session 12: Database Algorithms


Thursday, August 28, 14:00 - 15:30, Room 2

A One-Pass Algorithm for Accurately Estimating Quantiles for Disk-Resident Data K. Alsabti, S. Ranka, V. Singh

Concurrent Garbage Collection in O2 M. Skubiszewski, P. Valduriez

Garbage Collection in Object Oriented Databases Using Transactional Cyclic Reference Counting S. Ashwin, P. Roy, S. Seshadri, A. Silbershatz, S. Sudarshan

Research Session 13: Sorts and Joins


Thursday, August 28, 16:00 - 17:30, Room 2

Dynamic Memory Adjustment for External Mergesort W. Zhang , P-A. Larson

Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates S. Helmer, G. Moerkotte

Spatial Joins Using R-trees: Breadth-First Traversal with Global Optimizations Y-W. Huang, N. Jing, E. A. Rundensteiner

Research Session 14: Spatial Access Methods


Friday, August 29, 08:30 - 10:00, Room 1

A Generic Approach to Bulk Loading Multidimensional Index Structures J. van den Bercken, B. Seeger, P. Widmayer

A Region Splitting Strategy for Physical Database Design of Multidimensional File Organizations J-H. Lee, Y-K. Lee, K-Y. Whang, I-Y. Song

M-tree: An Efficient Access Method for Similarity Search in Metric Spaces P. Ciaccia, M. Patella, P. Zezula

Research Session 15: Querying and Browsing


Friday, August 29, 08:30 - 10:00, Room 2

DataGuides: Enabling Query Formulation and Optimization in Semistructured Databases R. Goldman, J. Widom

Keyword detection, navigation, and annotation in hierarchical text S. Chakrabarti, B. Dom, R. Agrawal, P. Raghavan

Towards an ODMG-Compliant Visual Object Query Language M. Chavda, P. Wood

Research Session 16: Query Processing


Friday, August 29, 11:30 - 13:00, Room 1

Fast Incremental Maintenance of Approximate Histograms P. Gibbons, Y. Matias, V. Poosala

Groupwise Processing of Relational Queries D. Chatziantoniou, K. Ross

Selectivity Estimation Without the Attribute Value Independence Assumption V. Poosala, Y. Ioannidis

Research Session 17: Multimedia Databases


Friday, August 29, 11:30 - 13:00, Room 2

Effective Memory Use in a Media Server E. Chang, H. Garcia-Molina

Efficient User-Adaptable Similarity Search in Large Multimedia Databases T. Seidl, H-P. Kriegel

Resource Scheduling in Enhanced Pay-Per-View Continuous Media Databases M. N. Garofalakis, B. Ozden, A. Silberschatz

Industrial Sessions


Industrial Session 1: System Experiences
Wednesday, August 27, 11:00 - 12:30, Room 3

Integrating SQL databases with content-specific search engines S. Dessloch, N.M. Mattos

Facilitating Multimedia Database Exploration through Visual Interfaces and Perpetual Query Reformulations W-S. Li, S. Candan, K. Hirata, Y. Hara

Geo/Environmental and Medical Data Management in the RasDaMan System P. Baumann, P. Furtado, R. Ritsch, N. Widmann

Industrial Session 2: Application Challenges


Wednesday, August 27, 14:00 - 15:30, Room 3

GTE SuperPages: Using IR Techniques for Searching Complex Objects S. Whitehead, H. Sinha, M. Murphy

Data Manager for Evolvable Real-time Command and Control Systems R. Ginis, E. Hughes, P. Krupp, J. Maurer, B. Thuraisingham

Mining Insurance Data at Swiss Life J-U. Kietz, U. Reimer, M. Staudt

Industrial Session 3: Research Visions


Thursday, August 28, 14:00 - 15:30, Room 3

The Network as a Global Database: Challenges of Interoperability, Proactivity, Interactiveness, Legacy P. Lockemann, U. Koelsch, A. Koschel, R. Kramer, R. Nik

Distributed Processing over Stand-alone Systems and Applications G. Alonso, C. Hagen, H-J. Schek, M. Tresch

Critical Database Technologies for High Energy Physics D.M. Malon, E.N. May

Industrial Session 4: Industry Solutions


Friday, August 29, 08:30 - 10:00, Room 3

Caprera: An Activity Framework for Transaction Processing on Wide-Area Networks S. Kumar, E-K. Kwang, D. Agrawal

The Oracle Universal Server Buffer W. Bridge, A. Joshi, M. Keihl, T. Lahiri, J. Loaiza, N. Macnaughton

Efficient Testing of High Performance Transaction Processing Systems D. Wildfogel, R. Yerneni

Panel sessions


TO BE ANNOUNCED

INVITED TALKS


TO BE ANNOUNCED

10 YEAR AWARD TALK: TBA


This year's winner of the 10-year Award is: "The R+-Tree: A Dynamic Index for Multidimensional Objects", by T. Sellis, N. Roussopoulos and C. Faloutsos. Thursday, August 28, 17:45 - 18:45

Cultural and Social Events


Conference Welcome Reception Tuesday, August 26, 20:00 - 23:00

Conference Banquet Thursday, August 28, 20:00 - 23:00


VLDB '97 Conference Location
The conference will be held at Astir Palace Resort at Vouliagmeni, a location 9 Km from the Athens Airport and south of the city of Athens.

Three hotels (Arion, 150 rooms and 73 bangalows; Nafsika, 163 rooms; and Aphrodite, 165 rooms) offer fun, relaxation and meeting sites on 80 acres of private, pine-dotted land. With a total capacity of 551 rooms, including 32 suites, Astir Palace at Vouliagmeni offers a magnificent view of the sea and the surrounding islands, plus many amenities: 3 private beaches, 1 indoor and 3 outdoor swimming pools, 8 restaurants, 7 bars, music bar, tennis courts, health club, all water sports, and 11 conference rooms offering extensive meeting for up to 600 persons.

ASTIR PALACE RESORT AT VOULIAGMENI is the ideal place either for an intimate dinner for two or a coctail party by the pool for up to 2,000 guests.


Conference Registration Form
Please type or print clearly in large letters.

Last Name:.......................... First Name:..........................

Affiliation:..............................................................

Mailing Address: .........................................................

..........................................................................

..........................................................................

Tel:............................... Fax:..................................

E-mail:...................................................................

Registration Fees

On or before August 1st After August 1st Regular registration fee US$ 400 / GRD 110.000 US$ 450 / GRD 120.000 Student registration fee US$ 225 / GRD 60.000 US$ 225 / GRD 60.000

Participants from Greece can pay the equivalent amount in GRD (GRD = Greek drachmas).

Amount enclosed: US$................. or GDR. ............................

To be allowed to pay the student registration fee, this form must be signed by the student's advisor:

Advisor's name:...................................

Advisor's affiliation:................... Adv. signature: .................

Payment can be made by credit card (VISA or MasterCard) or by draft/banker checks payable to "D.G. Kalofolias & Co". If paying by credit card:

1. Please add an additional 5% processing fee. 2. Please sign the following authorisation:

I authorise D.G. Kalofolias & Co to charge the registration fees of ............. to my Credit Card number:............................ Visa(yes/no):........ Mastercard(yes/no):......... Exp. Date: (MM/YY):........... issued by:............(Name of the Bank)

Cardholder's name:..........................Signature:................

Do you need a personalized invitation to help your visa application: (Yes/No) ..........

Please indicate which tutorials you plan to attend:

Tutorial # 1 2 3 4 5 6


Tick here | | | | | | |

VLDB Journal Special Offer
Check here ........ if you want to subscribe to the VLDB journal for 1998 ...... or 1997 ....... (please check one or both) at an annual subscription of DM 52 (approximately US$38) for individuals and DM 260 for institutions. Payments can be made during VLDB '97 registration.


Please send by regular mail or fax and follow with regular mail this registration form (with payment enclosed) to:

D.G. Kalofolias & Co - Conferences "Kapa" 39, Halandriou Str. Maroussi 15125, Athens Greece Attn: Ms. Elena Margaropoulou (VLDB 97)

For questions, please contact

Ms. Elena Margaropoulou at the above address or at Tel: +30-1-6898400, Fax: +30-1-6898413 email: vldb97@matrix.Kapatel.gr


== Hotel Reservation / Transport Booking Form
Please type or print clearly in large letters.

Last Name: ..................................................................

First Name: ..................................................................

Affiliation: ..................................................................

Mailing Address: ..............................................................

...............................................................................

...............................................................................

Tel: ................................

Fax: ................................

E-mail: .............................

Arrival date: ......................... Time: .................................


Hotel Reservation
I wish to reserve a

Single room ........... _ Double room ........ |_| (Check here if you would prefer a double bed)

Check-in (date): ......... Check out (date): ............ No. of nights: .....

at the following hotel:

Please, note that the US$ prices have been calculated according to the currency exchange ("buy" rate) of US$ 1 = 266.365 GRD (GRD=Greek drachmas) set on May 22, 1997. Final calculations should be made according to the current prices on the payment day.

Hotel Name Order of Star Single Double Single Double Preference rating US$ GRD ASTIR PALACE RESORT / Vouliagmeni | | Deluxe 139 158 37.000 42.000 ARMONIA / Vouliagmeni | | Four 103 128 27.500 34.100 PLAZA / Vouliagmeni | | Four 95 116 25.300 30.800 CONGO PALACE / Glyfada | | Four 65 86 17.300 22.800 EMMANTINA / Glyfada | | Four 54 72 14.400 19.200 BEST WESTERN FENIX / Glyfada | | Four 51 74 13.700 19.800

Note :

1. Glyfada is about a 10 km distance from the conference location (Astir Palace Resort at Vouliagmeni). 2. There will be a bus service during the days of the conference to accommodate the participants who stay at the hotels in Glyfada to and from the conference location. The bus will follow a prescheduled itinerary passing from all the above hotels each morning and will make the same journey returning from the conference location late at afternoon. 3. If two attendees are sharing a double room, only one of them should submit the hotel reservation form. 4. You may give your order of preference, in case of non-availability of rooms in a hotel, by writing numbers (1=first,2=second ...) next to the boxes. To make sure that you get rooms in the hotel of your choice, please make your reservations as early as possible. 5. The deposit for reservation is equal to the charge for one night's accommodation, and is non refundable.

All hotel rates are inclusive of presently applicable taxes, breakfast and service charges.


Transport Booking
Pre-ordered taxi service is available for those interested for transferring at the date of their arrival from the airport to their hotel at the cost of 8.300 GRD / 31 US$. Check here

Taxi Order Information

(Yes/No)...... Date of Arrival ........... Time of Arrival...............

Airlines .......................... Flight Number........................

if you wish to book for an airport to hotel taxi ride.

Please, note also:

There will be a bus service for the transfer of the participants the day preceding the beginning of the conference and the last day of the conference from the airports (West, Olympic and Charter Airport) to the hotels (those mentioned above) and vice versa. The hours of departure will be prescheduled and the bus will follow a predefined itinerary. To help us in setting up a reasonable schedule, if you would like to use this service, please fill out the following information

Bus Transfer Information

Date of Arrival .................... Time of Arrival ....................

Airlines ........................... Flight Number ......................

The exact itinerary of the buses will be sent to you later.

There is a number of excursions and other activities (pre- and post-conference tours) for accompanying perons; please check the " Hotels, tours and general information" section. A representative of the official VLDB 97 travel agency (Airtour Greece S.A.) will be at the conference location to assist you. For more information, do not hesitate to also contact them at the address

AIRTOUR GREECE S.A. 330, Thiseos Ave. Athens,GR 176 75 GREECE Tel: +30-1-9395-663 through -665 Fax: +30-1-9395300 email: incentiv@airtour.gr Responsible for VLDB 97: Mr. P. Skordos, Ms. Chr. Mastoridou


Payment Details
Hotel Deposit: .................... Taxi ride cost: ....................

Total Amount enclosed US$/GRD ............ payable by:

Tick here


Bank check | |
Credit card | |
Payment can be made by credit card (Visa or Mastercard) or by draft/banker check payable to "D.G. Kalofolias & Co". If paying by credit card:

1.Please add an additional 5% processing fee 2.Please sign the following authorisation:

I authorise D.G. Kalofolias & Co to charge the fees of .............. to my Credit Card number:.................................................. Visa(yes/no): ............ Mastercard(yes/no): .............. Exp. Date: (MM/YY):..............issued by:..................(Name of the Bank)

Cardholder's name:......................Signature:........................


Please send by regular mail or fax and follow with regular mail this registration form (with payment enclosed) to:

D.G. Kalofolias & Co - Conferences "Kapa" 39, Halandriou Str. Maroussi 15125, Athens Greece Attn: Ms. Elena Margaropoulou (VLDB 97)

For questions, please contact

Ms. Elena Margaropoulou at the above address or at Tel: +30-1-6898400, Fax: +30-1-6898413 email: vldb97@matrix.Kapatel.gr


Conferences in and about Greece Directory - Previous Article - Next Article
Back to Top
Copyright 1995-2016 HR-Net (Hellenic Resources Network). An HRI Project.
All Rights Reserved.

HTML by the HR-Net Group / Hellenic Resources Institute, Inc.
misc2html v2.01 run on Tuesday, 10 June 1997 - 18:53:51 UTC