Algorithms for Optimizing Search Schedules in a Polygon

In the area of motion planning, considerable work has been done on guarding problems, where "guards", modelled as points, must guard a polygonal space from "intruders". Different variants of this problem involve varying a number of factors. The guards performing the search may vary in terms of their number, their mobility, and their range of vision. The model of intruders may or may not allow them to move. The polygon being searched may have a specified starting point, a specified ending point, or neither of these. The typical question asked about one of these problems is whether or not certain polygons can be searched under a particular guarding paradigm defined by the types of guards and intruders. In this thesis, we focus on two cases of a chain of guards searching a room (polygon with a specific starting point) for mobile intruders. The intruders must never be allowed to escape through the door undetected. In the case of the two guard problem, the guards must start at the door point and move in opposite directions along the boundary of the polygon, never crossing the door point. At all times, the guards must be able to see each other. The search is complete once both guards occupy the same spot elsewhere on the polygon. In the case of a chain of three guards, consecutive guards in the chain must always be visible. Again, the search starts at the door point, and the outer guards of the chain must move from the door in opposite directions. These outer guards must always remain on the boundary of the polygon. The search is complete once the chain lies entirely on a portion of the polygon boundary not containing the door point. Determining whether a polygon can be searched is a problem in the area of visibility in polygons; further to that, our work is related to the area of planning algorithms. We look for ways to find optimal schedules that minimize the distance or time required to complete the search. This is done by finding shortest paths in visibility diagrams that indicate valid positions for the guards. In the case of the two-guard room search, we are able to find the shortest distance schedule and the quickest schedule. The shortest distance schedule is found in O(n^2) time by solving an L_1 shortest path problem among curved obstacles in two dimensions. The quickest search schedule is found in O(n^4) time by solving an L_infinity shortest path problem among curved obstacles in two dimensions. For the chain of three guards, a search schedule minimizing the total distance travelled by the outer guards is found in O(n^6) time by solving an L_1 shortest path problem among curved obstacles in two dimensions

Soldier, Pow, Partisan: My Experiences during the Battle of France, June–September 1944

The invasion of Festung Europa has been called many things, among them, die greatest military feat in history, the liberation of Europe’s downtrodden millions, and many other such high and mighty sounding phrases. But to those of us who were to take part in this operation the mouthings of the country’s great meant little. Truly we were impressed by the magnitude of the coming battle, but its true meaning to us who had waited so long was simply “action.

Barnes Hospital Bulletin

https://digitalcommons.wustl.edu/bjc_barnes_bulletin/1046/thumbnail.jp

Detained and at Risk: Sexual Abuse and Harassment in United States Immigration Detention

In May 2010, reports surfaced that the United States Immigration and Customs Enforcement agency (ICE) was investigating allegations that a guard at a Texas immigration detention center had sexually assaulted several female detainees. The guard, who was arrested on August 19, 2010, on suspicion of official oppression and unlawful restraint, allegedly groped women while transporting them to an airport and a bus station where they were being released.While largely covered in the media as an isolated incident, this was only the latest in a series of assaults, abuses, and episodes of harassment that have quietly emerged as a pattern across the rapidly expanding immigration detention system. Due to a shortage of publicly available data and the closed nature of the detention system, the extent to which ICE detainees are subject to sexual abuse nationwide is unclear, but the known incidents are too serious and numerous to ignore.ICE has recently proposed policy changes to address sexual abuse, and these show promise. They include prohibitions on guards searching detainees of a different gender and restrictions on when guards may transport detainees of a different gender. ICE plans to publish a revised detention standard that includes new requirements for facilities to develop medical and investigation procedures and to collect data on incidents of abuse. However, more changes are needed, as well as greater oversight and accountability."Detained and at Risk" is based on the examination of allegations of sexual assault, abuse, and harassment in ICE detention from a range of sources, including press reports, governmental and nongovernmental studies, a public hearing, court documents, and Human Rights Watch interviews. The report shows evidence of a disturbing pattern of abuse, and points to an urgent need for investigation and action to correct glaring gaps in detention policy and practice

The changing of the guard: groupwork with people who have intellectual disabilities

This paper considers the impact of service systems on group activities. It describes an inter-professional groupwork project facilitated by a social worker and a community nurse. The project provided an emancipatory experience for a group of adults who had intellectual disabilities. The group was charged with the task of reviewing and updating the recruitment and interview processes used by a 'Learning Disability Partnership Board', when employing new support workers. The paper begins with a brief history of intellectual disability and provides a context to the underpinning philosophical belief that people should be encouraged and supported to inhabit valued social roles no matter what disability they may have. It then identifies the ways in which the sponsoring health, education and social care services impacted on the creation and development of a groupwork project. It might have been expected that the nature of the intellectual disability would have been the major influence on group process. However the paper reveals that organisational constraints had a significant impact on group functioning. Issues including, staffing budgets and transport contracts impacted on group process and function. The results of the project show how, with adequate support, people with intellectual disability can make important decisions that have long-reaching impacts on the services

Tracking Chart 2005 Asics, China 40001537D

This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_2005_Asics_TC_China_40001537D.pdf: 15 downloads, before Oct. 1, 2020

Spartan Daily, November 1, 1940

Volume 29, Issue 32https://scholarworks.sjsu.edu/spartandaily/3194/thumbnail.jp