公开(公告)号：US20100145628A1

公开(公告)日：2010-06-10

申请号：US12331884

申请日：2008-12-10

Applicant: RAVISHANKAR RAMAMURTHY ,  Shouxian Ren

Inventor： RAVISHANKAR RAMAMURTHY ,  Shouxian Ren

IPC: G06F19/00

CPC classification number: F01N9/00 ,  F01N3/2066 ,  F01N2900/0601 ,  F01N2900/08 ,  F01N2900/12 ,  F01N2900/1402 ,  Y02A50/2325 ,  Y02T10/24 ,  Y02T10/47

Abstract: A NOx estimation system includes an operating mode determination module that determines an operating mode of an engine, and an emission prediction module. The emission prediction module estimates NOx emission based on the operating mode, a plurality of sensed parameters, and a map. The map correlates the plurality of sensed parameters to the NOx emission based on the operating mode.

Abstract translation: NOx估计系统包括确定发动机的运行模式的运行模式确定模块和排放预测模块。 排放预测模块基于操作模式，多个感测参数和地图来估计NOx排放。 该地图基于操作模式将多个感测参数与NOx排放相关联。

公开(公告)号：US20090183508A1

公开(公告)日：2009-07-23

申请号：US12043211

申请日：2008-03-06

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F02B33/34 ,  F02M63/00

CPC classification number: F02D41/0007 ,  F01N9/002 ,  F02B39/16 ,  F02D41/029 ,  F02D41/1448 ,  F02D41/221 ,  F02D2200/703 ,  F02D2250/26 ,  Y02T10/144 ,  Y02T10/40

Abstract: A turbocharger protection system for an engine system that includes a particulate filter and a turbocharger comprises a delta pressure estimator that estimates a pressure difference in a particulate filter. A pressure factor estimator module estimates a pressure factor based on the difference and barometric pressure. A fuel limit estimator module protects the turbocharger by selectively limiting fuel injection to the engine based on the pressure factor.

Abstract translation: 一种用于包括微粒过滤器和涡轮增压器的发动机系统的涡轮增压器保护系统包括估计微粒过滤器中的压力差的δ压力估计器。 压力因子估计器模块基于差异和大气压力估计压力因子。 燃料极限估计器模块通过基于压力因子选择性地限制对发动机的燃料喷射来保护涡轮增压器。

公开(公告)号：US07493337B2

公开(公告)日：2009-02-17

申请号：US10813963

申请日：2004-03-31

Applicant: Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

Inventor： Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

IPC: G06F7/00 ,  G06F17/00 ,  G06F17/30

CPC classification number: G06F17/30522 ,  G06F17/30306 ,  Y10S707/99932 ,  Y10S707/99945 ,  Y10S707/99948

Abstract: A query progress indicator that provides an indication to a user of the progress of a query being executed on a database. The indication of the progress of the query allows the user to decide whether the query should be allowed to complete or should be aborted. One method that may be used to estimate the progress of a query that is being executed on a database defines a model of work performed during execution of a query. The total amount of work that will be performed during execution of the query is estimated according to the model. The amount of work performed at a given point during execution of the query is estimated according to the model. The progress of the query is estimated using the estimated amount of work at the given point in time and the estimated total amount of work. This estimated progress of query execution may be provided to the user.

Abstract translation: 查询进度指示符，向用户提供在数据库上执行的查询的进度的指示。 查询进度的指示允许用户决定是否允许查询完成或应该被中止。 可用于估计在数据库上执行的查询的进度的一种方法定义了在查询执行过程中执行的工作模型。 根据模型估计执行查询期间执行的总工作量。 在执行查询期间在给定点执行的工作量根据模型进行估计。 查询的进度使用在给定时间点的估计工作量和估计的总工作量来估计。 可以向用户提供该估计的查询执行进度。

公开(公告)号：US20080071785A1

公开(公告)日：2008-03-20

申请号：US11468928

申请日：2006-08-31

Applicant: Govind Kabra ,  Ravishankar Ramamurthy ,  Sundararajarao Sudarshan

Inventor： Govind Kabra ,  Ravishankar Ramamurthy ,  Sundararajarao Sudarshan

IPC: G06F17/30

CPC classification number: G06F17/30471 ,  G06F17/30306 ,  G06F21/6227

Abstract: Fine-grained access control for querying a database with low overhead and safety plans. In a view placement approach, base relations of the query expression are replaced by views that are appropriate for the particular user. Information leakage via UDF pushing, exception processing, and error messages can be prevented by generating safe plans. An existing query optimizer can be modified to perform redundancy removal and safe plan implementation. Subsumption testing available in materialized view matching can be exploited by the query optimizer. Authorization inference is exploited to generate safe plans.

Abstract translation: 用于以低开销和安全计划查询数据库的细粒度访问控制。 在视图放置方法中，查询表达式的基础关系被替换为适合特定用户的视图。 可以通过生成安全计划来防止通过UDF推送，异常处理和错误消息的信息泄漏。 可以修改现有的查询优化器，以执行冗余删除和安全计划实施。 查询优化器可以利用实体​​化视图匹配中的可用度量测试。 利用授权推理来制定安全计划。

公开(公告)号：US20080016865A1

公开(公告)日：2008-01-24

申请号：US11459382

申请日：2006-07-24

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F01N5/04 ,  F01N3/00 ,  F02D23/00 ,  F02B33/44

CPC classification number: F02B37/24 ,  F01N3/021 ,  F01N9/00 ,  F01N2260/06 ,  F02B3/06 ,  F02D23/02 ,  F02D41/005 ,  F02M26/05 ,  F02M26/16 ,  F02M26/23 ,  Y02T10/144 ,  Y02T10/20 ,  Y02T10/47

Abstract: A control system and method that compensates for changes in backpressure of an engine includes a pressure sensor that senses the backpressure. A boost compensation module that communicates with the pressure sensor, determines an averaged BC factor, and adjusts a variable geometry turbo based on the averaged BC factor.

Abstract translation: 补偿发动机背压变化的控制系统和方法包括感测背压的压力传感器。 与压力传感器通信的升压补偿模块确定平均BC因子，并根据平均BC因子调整可变几何涡轮增压。

公开(公告)号：US08630998B2

公开(公告)日：2014-01-14

申请号：US12789486

申请日：2010-05-28

Applicant: Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

Inventor： Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

IPC: G06F7/00

CPC classification number: G06F17/30448 ,  G06F11/3664 ,  G06F11/3676

Abstract: Described is a test framework for testing transformation rules of query optimizers. Rule patterns obtained as tree structures from a query optimizer are used to generate queries that are used to test the rule optimizer's transformation rules. The test framework tracks which rules are exercised for each query, and also determines the correctness of the transformation rule by comparing the results of the query processing with the rule and without the rule (by turning off the rule). The test framework creates a composite pattern corresponding to two or more rules, such as to test rules in a set (e.g., as pairs). Also described is the efficient execution of a test suite for correctness testing, in which queries of the test suite are selected based upon cost information.

Abstract translation: 描述了用于测试查询优化器的转换规则的测试框架。 使用从查询优化器获取的树结构的规则模式用于生成用于测试规则优化器转换规则的查询。 测试框架跟踪每个查询执行哪些规则，并且通过将查询处理的结果与规则进行比较，并且通过将规则（通过关闭规则）进行比较来确定变换规则的正确性。 测试框架创建一个对应于两个或多个规则的复合模式，例如测试集合中的规则（例如，成对）。 还描述了用于正确性测试的测试套件的有效执行，其中基于成本信息来选择测试套件的查询。

公开(公告)号：US20130132352A1

公开(公告)日：2013-05-23

申请号：US13303154

申请日：2011-11-23

Applicant: Shriraghav Kaushik ,  Ravishankar Ramamurthy ,  Yupeng Fu

Inventor： Shriraghav Kaushik ,  Ravishankar Ramamurthy ,  Yupeng Fu

IPC: G06F17/30 ,  G06F7/00

CPC classification number: G06F16/2453 ,  G06F16/211

Abstract: The present application provides for techniques for implementing data auditing embodiments that determine whether a query into a database is or has referenced forbidden data within the database. Various techniques are given for efficiently finding all tuples in a database referenced by a given query. A set of sensitive data is determined within a database and the set of sensitive data is employed to define a forbidden view within the database. Data within the database may be annotated to provide efficient identification of data access by query. Incoming queries may be analyzed and modified to propagate annotations for analyzing what data is or was accessed.

Abstract translation: 本申请提供了用于实现数据审计实施例的技术，其确定数据库中的查询是否是数据库内的或已经引用了数据库中的禁止数据。 给出了各种技术，用于有效地查找给定查询引用的数据库中的所有元组。 在数据库中确定一组敏感数据，并采用敏感数据集来定义数据库中的禁止视图。 可以注释数据库内的数据，以便通过查询提供对数据访问的有效识别。 可以分析和修改传入查询以传播用于分析数据被访问或被访问的注释。

公开(公告)号：US20120150841A1

公开(公告)日：2012-06-14

申请号：US12963506

申请日：2010-12-08

Applicant: Ravishankar Ramamurthy ,  Kaushik Shiriraghav

Inventor： Ravishankar Ramamurthy ,  Kaushik Shiriraghav

IPC: G06F17/30

CPC classification number: G06F17/30289

Abstract: Methods and systems for auditing queries using query differentials are disclosed. A method includes identifying a set of queries, determining if results of each query of the set of queries are different from results of respective differentials of each query of the set of queries, and based on the determining, making a characterization of each query of the set of queries as one of safe and unsafe. Access is provided to the characterization of each query of the set of queries.

Abstract translation: 公开了使用查询差异来审计查询的方法和系统。 一种方法包括识别一组查询，确定该组查询的每个查询的结果是否与该组查询的每个查询的相应差异的结果不同，并且基于确定，对每个查询的每个查询进行表征 一组查询作为安全和不安全的一个。 访问被提供给查询集合的每个查询的表征。

公开(公告)号：US08185519B2

公开(公告)日：2012-05-22

申请号：US12404284

申请日：2009-03-14

Applicant: Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

Inventor： Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

IPC: G06F7/00 ,  G06F17/30

CPC classification number: G06F17/30463

Abstract: An exact cardinality query optimization system and method for optimizing a query having a plurality of expressions to obtain a cardinality-optimal query execution plan for the query. Embodiments of the system and method use various techniques to shorten the time necessary to obtain the cardinality-optimal query execution plan, which contains the query execution plan when all cardinalities are exact. Embodiments of the system and method include a covering queries technique that leverages query execution feedback to obtain an unordered subset of relevant expressions for the query, an early termination technique that bounds the cardinality to determine whether the processing can be terminate before each of the expressions are executed, and an expressions ordering technique that finds an ordering of expressions that yields the greatest reduction in time to obtain the cardinality-optimal query execution plan.

Abstract translation: 一种精确的基数查询优化系统和方法，用于优化具有多个表达式的查询，以获得查询的基本优化查询执行计划。 系统和方法的实施例使用各种技术来缩短获得基数优化查询执行计划所需的时间，当所有基数是精确的时，其包含查询执行计划。 该系统和方法的实施例包括利用查询执行反馈来获取查询的相关表达式的无序子集的覆盖查询技术，限制基数以确定处理是否可以在每个表达式之前终止的提前终止技术是 以及表达式排序技术，其找到产生最大时间缩短以获得基数优化查询执行计划的表达式的排序。

公开(公告)号：US07987672B2

公开(公告)日：2011-08-02

申请号：US12043211

申请日：2008-03-06

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F02D23/00 ,  F02D43/00 ,  F01N3/00 ,  F01N5/04 ,  F01N3/02 ,  F01N3/24

CPC classification number: F02D41/0007 ,  F01N9/002 ,  F02B39/16 ,  F02D41/029 ,  F02D41/1448 ,  F02D41/221 ,  F02D2200/703 ,  F02D2250/26 ,  Y02T10/144 ,  Y02T10/40

Abstract: A turbocharger protection system for an engine system that includes a particulate filter and a turbocharger comprises a delta pressure estimator that estimates a pressure difference in a particulate filter. A pressure factor estimator module estimates a pressure factor based on the difference and barometric pressure. A fuel limit estimator module protects the turbocharger by selectively limiting fuel injection to the engine based on the pressure factor.

Abstract translation: 一种用于包括微粒过滤器和涡轮增压器的发动机系统的涡轮增压器保护系统包括估计微粒过滤器中的压力差的δ压力估计器。 压力因子估计器模块基于差异和大气压力估计压力因子。 燃料极限估计器模块通过基于压力因子选择性地限制对发动机的燃料喷射来保护涡轮增压器。