Yun T Chi, Age ~46Dublin, CA

Yun Chi Phones & Addresses

Dublin, CA

8217 Portobello Ave, Mesa, AZ 85212 (480) 357-8891

Chandler, AZ

Oakland, CA

Alameda, CA

San Francisco, CA

Maricopa, AZ

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Yun Chi

Location:
United States

Business Records

Name / TitleCompany / ClassificationPhones & Addresses
Yun Chi
Principal
Sy Properties LLC 8217 E Portobello Ave, Mesa, AZ 85212
Yun Chi ZEE ENGINEERING GROUP, LLC Ste 12 STE 120, Mesa, AZ 85210
8217 E Portobello Ave, Mesa, AZ 85212
Yun Chi Ping Tao LLC 16320 Ridgecrest Ave, Los Gatos, CA 95030

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Yun Chi Photo 2

Yun Chiho

Yun Chi-ho is standing in the rear. His father, General Yun Ung-nyeol is seated, wearing the western uniform of the Korean Empire. ...

Us Patents

Systems And Methods For Classifying Content Using Matrix Factorization

US Patent:
7788264, Aug 31, 2010
Filed:
Oct 10, 2007
Appl. No.:
11/869899
Inventors:
Kai Yu - Cupertino CA,
Yun Chi - Santa Clara CA,
Yihong Gong - Saratoga CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 17/30
US Classification:
707739, 706 20
Abstract:
Systems and methods for classifying documents each having zero or more links thereto include generating a link matrix; generating a document term matrix; and jointly factorizing the document term matrix and the link matrix.

Admission Control In Cloud Databases Under Service Level Agreements

US Patent:
2012010, May 3, 2012
Filed:
Oct 1, 2011
Appl. No.:
13/251215
Inventors:
Pengcheng Xiong - Cupertino CA,
Yun Chi - Monte Sereno CA,
Junichi Tatemura - Cupertino CA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC LABORATORIES AMERICA, INC. - Princeton NJ
International Classification:
G06N 7/02
US Classification:
706 52
Abstract:
An admission control system for a cloud database includes a machine learning prediction module to estimate a predicted probability for a newly arrived query with a deadline, if admitted into the cloud database, to finish its execution before said deadline, wherein the prediction considers query characteristics and current system conditions. The system also includes a decision module applying the predicted probability to admit a query into the cloud database with a target of profit maximization with an expected profit determined using one or more service level agreements (SLAs).

Balancing Database Workloads Through Migration

US Patent:
2013027, Oct 17, 2013
Filed:
Apr 3, 2013
Appl. No.:
13/855765
Inventors:
Yun Chi - Monte Sereno CA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 17/30
US Classification:
707654
Abstract:
A method for balancing database workloads among a plurality of database servers includes when a new server is available, selecting a set of master and slave databases to be migrated to the new server; and migrating the selected databases to result in a balanced new workload among all servers while minimizing migration cost; and during operation, if workload unbalance is detected in real time from a workload change in a certain database, iteratively selecting one database at a time to migrate to a different server to balance the workload.

Predicting Query Execution Time

US Patent:
2013022, Aug 29, 2013
Filed:
Dec 11, 2012
Appl. No.:
13/711023
Inventors:
Yun Chi - Monte Sereno CA,
Junichi Tatemura - Morrisville PA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 17/30
US Classification:
707719
Abstract:
There are provided a system and method for predicting query execution time in a database system. A cost model determination device determines a cost model of a database query optimizer for the database system. The cost model models costs of queries applied to the database system. A profiling device determines profiling queries for profiling input/output cost units and processor cost units relating to the database system, and profiles the cost units using the profiling queries to output profiled cost units. A calibrating device calibrates cost units in the cost model responsive to the profiled cost units to output calibrated cost units. A sampling re-estimator samples and re-estimates a cardinality estimation of a final query plan to output an updated cardinality estimation. A predictor applies the calibrated cost units and the updated cardinality estimation in the cost model to generate a prediction of an execution time of a given query.

System And Method For Sla-Aware Database Consolidation Using Per-Tenant Memory Size Configuration

US Patent:
2013021, Aug 15, 2013
Filed:
Nov 21, 2012
Appl. No.:
13/683849
Inventors:
Hyun Jin Moon - Newark CA,
Yun Chi - Monte Sereno CA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 17/30
US Classification:
707609
Abstract:
Systems and methods for consolidating workload on one or more computing devices, comprising: generating tenant performance profiles for at least one of a buffer memory size and a buffer warmness; assigning one or more tenants to a database management system (DBMS) instance; configuring the one or more tenants to minimize a total server count needed to host the one or more tenants; and reducing the total server count by adjusting of buffer sizes while satisfying Service Level Agreement (SLA) requirements.

Scheduling Methods Using Soft And Hard Service Level Considerations

US Patent:
2013016, Jun 27, 2013
Filed:
Jun 16, 2012
Appl. No.:
13/525308
Inventors:
Hyun Jin MOON - NEWARD CA,
Yun CHI - MONTE SERENO CA,
Vahit Hakan HACIGUMUS - SAN JOSE CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
H04L 12/24
US Classification:
709226
Abstract:
A computer implemented method of workload scheduling under two different types of Service Level Agreements (SLAs), namely soft and hard SLA which employ both a deadline- and cost-aware scheduler called iCBS-DH. The scheduler is evaluated against deadline and cost performance of various scheduling policies under a large range of SLA cost function and deadline types.

Latency-Aware Live Migration For Multitenant Database Platforms

US Patent:
2013008, Apr 4, 2013
Filed:
Oct 4, 2012
Appl. No.:
13/645103
Inventors:
Yun Chi - Monte Sereno CA,
Hyun Jin Moon - Newark CA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 17/30
G06F 12/16
US Classification:
707649, 707E17005
Abstract:
Methods and systems for database migration from a multitenant database include taking a snapshot of an original database to be migrated with a hot backup process, such that the database is still capable of answering queries during the hot backup process; maintaining a query log of all queries to the tenant database after the hot backup process begins; initializing a new database at a target server using the snapshot; replaying the query log synchronize the new database with the original database; and answering new queries with the new database and not the original database.

Service Level Agreement-Aware Migration For Multitenant Database Platforms

US Patent:
2013008, Apr 4, 2013
Filed:
Oct 4, 2012
Appl. No.:
13/645112
Inventors:
Yun Chi - Monte Sereno CA,
Hyun Jin Moon - Newark CA,
Vahit Hakan Hacigumus - San Jose CA,
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
G06F 9/455
US Classification:
703 22
Abstract:
A method for migration from a multitenant database is shown that includes building an analytical model for each of a set of migration methods based on database characteristics; predicting performance of the set of migration methods using the respective analytical model with respect to tenant service level agreements (SLAs) and current and predicted tenant workloads, where the prediction includes a migration speed and an SLA violation severity; and selecting a best migration method from the set of migration methods according to the respective predicted migration speeds and SLA violation severities.

Isbn (Books And Publications)

Shadows In A Chinese Landscape: The Notes Of A Confucian Scholar

Author:
Yun Chi
ISBN #:
0765601737

Shadows In A Chinese Landscape: The Notes Of A Confucian Scholar Chi Yun

Author:
Yun Chi
ISBN #:
0765601745

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