UMBC ebiquity
2016 April

Archive for April, 2016

talk: A Hybrid Task Graph Scheduler API, Tim Blattner, UMBC

April 24th, 2016, by Tim Finin, posted in Big data, High performance computing

A Hybrid Task Graph Scheduler API

Tim Blattner, UMBC

10:30am Monday, 25 April 2016, ITE 346

Scalability of applications is a key requirement to gaining performance in hybrid computing. Scheduling code to utilize the parallelism is difficult, particularly when dealing with dependencies, memory management, data motion, and processor occupancy. The Hybrid Task Graph Scheduler (HTGS) API increases programmer productivity to develop hybrid applications by creating a multiple-producer, multiple-consumer workflow system. HTGS improves upon existing task graph solutions with its design of execution pipelines that enables multi-GPU computation through data decomposition and task graph clustering that are bound to physical GPUs. The HTGS API is also capable of managing dependencies between tasks, represents CPU and GPU memories independently, overlaps disk I/O and memory transfers, and utilizes all available compute resources. We demonstrate the HTGS API by comparing a hybrid microscopy image stitching application with and without HTGS. By using HTGS in image stitching, code size is reduced by ~25% and shows favorable performance compared to image stitching without HTGS.

Context-Sensitive Policy Based Security in Internet of Things

April 18th, 2016, by Tim Finin, posted in IoT, Policy, Semantic Web

Prajit Kumar Das, Sandeep Nair, Nitin Kumar Sharma, Anupam Joshi, Karuna Pande Joshi, and Tim Finin, Context-Sensitive Policy Based Security in Internet of Things, 1st IEEE Workshop on Smart Service Systems, co-located with IEEE Int. Conf. on Smart Computing, St. Louis, 18 May 2016.

According to recent media reports, there has been a surge in the number of devices that are being connected to the Internet. The Internet of Things (IoT), also referred to as Cyber-Physical Systems, is a collection of physical entities with computational and communication capabilities. The storage and computing power of these devices is often limited and their designs currently focus on ensuring functionality and largely ignore other requirements, including security and privacy concerns. We present the design of a framework that allows IoT devices to capture, represent, reason with, and enforce information sharing policies. We use Semantic Web technologies to represent the policies, the information to be shared or protected, and the IoT device context. We discuss use-cases where our design will help in creating an “intelligent” IoT device and ensuring data security and privacy using context-sensitive information sharing policies.

Policies For Oblivious Cloud Storage Using Semantic Web Technologies

April 3rd, 2016, by Tim Finin, posted in cybersecurity, Ontologies, OWL, RDF, Security, Semantic Web

Policies For Oblivious Cloud Storage
Using Semantic Web Technologies

Vaishali Narkhede
10:30am, Monday, 4 April 2016, ITE 346, UMBC

Consumers want to ensure that their enterprise data is stored securely and obliviously on the cloud, such that the data objects or their access patterns are not revealed to anyone, including the cloud provider, in the public cloud environment. We have created a detailed ontology describing the oblivious cloud storage models and role based access controls that should be in place to manage this risk. We have also implemented the ObliviCloudManager application that allows users to manage their cloud data using oblivious data structures. This application uses role based access control model and collection based document management to store and retrieve data efficiently. Cloud consumers can use our system to define policies for storing data obliviously and manage storage on untrusted cloud platforms, even if they are not familiar with the underlying technology and concepts of the oblivious data structure.

Forum on Cybersecurity Concerns in Local Governments, Baltimore 4/15

April 3rd, 2016, by Tim Finin, posted in GENERAL

The UMBC School of Public Policy, bwtech@UMBC Cyber Incubator, and UMBC Center for Cybersecurity are sponsoring a form on Cybersecurity Concerns in Local Governments from 8:30-11:00am on Friday, April 15, 2016 at the Columbus Center in Baltimore.

“Like their counterparts in the private sector, it is important for local government officials and managers to understand cybersecurity threats to their websites and information systems and to take actions to prevent cyber attacks. The purpose of this forum is to present research on cybersecurity initiatives in local governments in Maryland, and highlight the public policy implications of these initiatives.”

There is no charge to attend this forum, but registration is required. For questions or more information, contact

8:30 a.m. Coffee, light breakfast and networking

9:00 Welcome and Overview

Cybersecurity Challenges in American Local Government
Donald F. Norris, Professor and Director, UMBC School of Public Policy

Policy-driven Approaches to Security
Anupam Joshi, Professor and Director, UMBC Center for Cybersecurity

Perspectives from Maryland Local Governments
Rob O’Connor, Chief Technology Officer, Baltimore County
Jerome Mullen, Chief Technology Officer, City of Baltimore

10:15 Audience Q & A

11:00 Adjourn

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