Outsourcing: An Historical Review for the Projection of Future Savings

Because of continuing budget and personnel limitations and the need to fund weapons modernization, the Department of Defense has increased its emphasis on outsourcing support activities. Recent studies have suggested that aggressive outsourcing of support activities by the DoD could produce billions of dollars in savings. The overriding purpose behind this research was to determine to what extent projected savings can be substantiated. To explore the potential for savings, this thesis examines the evolution and impact of outsourcing and privatization in both the private and public sectors. Next it looks at the experiences of private and public sectors to identify characteristics of successful and unsuccessful outsourcing ventures. Finally, it examines the Department of Defense\u27s past experience in achieving cost savings through outsourcing. The research revealed that savings have occurred through outsourcing and that most successful initiatives occur when the following conditions are present: (1) the requirement is specified unambiguously; (2) a competitive market exists; (3) the contractor\u27s performance can be monitored; and (4) appropriate terms are included in the contract. DoD\u27s previous outsourcing experience demonstrates that all of these conditions are not always satisfied and suggests that projected savings from current and planned initiatives may be overstated

Decomposition Algorithms in Stochastic Integer Programming: Applications and Computations.

In this dissertation we focus on two main topics. Under the first topic, we develop a new framework for stochastic network interdiction problem to address ambiguity in the defender risk preferences. The second topic is dedicated to computational studies of two-stage stochastic integer programs. More specifically, we consider two cases. First, we develop some solution methods for two-stage stochastic integer programs with continuous recourse; second, we study some computational strategies for two-stage stochastic integer programs with integer recourse. We study a class of stochastic network interdiction problems where the defender has incomplete (ambiguous) preferences. Specifically, we focus on the shortest path network interdiction modeled as a Stackelberg game, where the defender (leader) makes an interdiction decision first, then the attacker (follower) selects a shortest path after the observation of random arc costs and interdiction effects in the network. We take a decision-analytic perspective in addressing probabilistic risk over network parameters, assuming that the defender\u27s risk preferences over exogenously given probabilities can be summarized by the expected utility theory. Although the exact form of the utility function is ambiguous to the defender, we assume that a set of historical data on some pairwise comparisons made by the defender is available, which can be used to restrict the shape of the utility function. We use two different approaches to tackle this problem. The first approach conducts utility estimation and optimization separately, by first finding the best fit for a piecewise linear concave utility function according to the available data, and then optimizing the expected utility. The second approach integrates utility estimation and optimization, by modeling the utility ambiguity under a robust optimization framework following \cite{armbruster2015decision} and \cite{Hu}. We conduct extensive computational experiments to evaluate the performances of these approaches on the stochastic shortest path network interdiction problem. In third chapter, we propose partition-based decomposition algorithms for solving two-stage stochastic integer program with continuous recourse. The partition-based decomposition method enhance the classical decomposition methods (such as Benders decomposition) by utilizing the inexact cuts (coarse cuts) induced by a scenario partition. Coarse cut generation can be much less expensive than the standard Benders cuts, when the partition size is relatively small compared to the total number of scenarios. We conduct an extensive computational study to illustrate the advantage of the proposed partition-based decomposition algorithms compared with the state-of-the-art approaches. In chapter four, we concentrate on computational methods for two-stage stochastic integer program with integer recourse. We consider the partition-based relaxation framework integrated with a scenario decomposition algorithm in order to develop strategies which provide a better lower bound on the optimal objective value, within a tight time limit

Änderung der Sturmtätigkeit über den Weltmeeren, untersucht anhand von Luftdruckbeobachtungen

Die vorliegende Arbeit untersucht die Veränderung der Sturmtätigkeit über den Weltmeeren im Zeitraum von 1889 bis 1997. Hierfür wurden Luftdruckbeobachtungen aus Schiffsmessungen des Comprehensive Ocean-Atmosphere Data Set (COADS) verwendet. Untersuchungen deuten darauf hin, dass die Bestimmung von langfristigen Trends in Beobachtungsdaten durch die geringe Anzahl von Beobachtungen vor 1950 erschwert wird. Ein Schwerpunkt dieser Arbeit lag deshalb darauf, mit Hilfe von Monte-Carlo-Rechnungen die Fehler abzuschätzen, mit denen aufgrund der Schwankungen in den Beobachtungszahlen zu rechnen ist. Aufgrund der gewonnenen Erkenntnisse unter Einbeziehung der abgeschätzten Fehler kann nur davon ausgegangen werden, dass es im nördlichen Bereich des Nordatlantiks zu einer Intensivierung der Sturmtätigkeit in der Zeit von 1889 bis 1997 gekommen ist. Die Größe der abgeschätzten Fehler deutet darauf hin, dass es unbedingt erforderlich ist, diese Fehler zu berücksichtigen, um sichere Aussagen über langfristige Trends von Beobachtungsdaten mit stark veränderlicher Datendichte treffen zu können

Breast Mass Segmentation Using a Semi-automatic Procedure Based on Fuzzy C-means Clustering

Mammography is the primary modality that helped in the early detection and diagnosis of women breast diseases. Further, the process of extracting the masses in mammogram represents a challenging task facing the radiologists, due to problems such as fuzzy or speculated borders, low contrast and the presence of intensity inhomogeneities. Aims to help the radiologists in the diagnosis of breast cancer, many approaches have been conducted to automatically segment the masses in mammograms. Towards this aim, in this paper, we present a new approach for extraction of tumors from region-of-interest (ROI) using the algorithm of Fuzzy C-Means (FCM) setting two clusters for semi-automated segmentation. The proposed method meant to select as input data the set of pixels that enable to get the meaningful information required to segment the masses with high accuracy. This could be accomplished through eliminating unnecessary pixels, which influence on this process through separating it outside of the input data using an optimal threshold given by monitoring the change of clusters rate during the process of threshold decrementing. The proposed methodology has successfully segmented the masses, with an average sensitivity of 82.02% and specificity of 98.23%

A New Approach to the Detection of Mammogram Boundary

Mammography is a method used for the detection of breast cancer. computer-aided diagnostic (CAD) systems help the radiologist in the detection and interpretation of mass in breast mammography. One of the important information of a mass is its contour and its form because it provides valuable information about the abnormality of a mass. The accuracy in the recognition of the shape of a mass is related to the accuracy of the detected mass contours. In this work we propose a new approach for detecting the boundaries of lesion in mammography images based on region growing algorithm without using the threshold, the proposed method requires an initial rectangle surrounding the lesion selected manually by the radiologist (Region Of Interest), where the region growing algorithm applies on lines segments that attach each pixel of this rectangle with the seed point, such as the ends (seeds) of each line segment grow in a direction towards one another. The proposed approach is evaluated on a set of data with 20 masses of the MIAS base whose contours are annotated manually by expert radiologists. The performance of the method is evaluated in terms of specificity, sensitivity, accuracy and overlap. All the findings and details of approach are presented in detail

Modifications structurales (assemblage élémentaire) liées à l'activité racinaire au sein de sols limono-argileux

Ary Bruand : Present address : Institut des Sciences de la Terre d'OrléansInternational audienceThe groundmass porosity was studied in scanning electron microscopy by using the back-scattered electrons. The image analysis showed the groundmass fabric as altered around pores owing to root activity. This alteration of the groundmass fabric concerns the lacunar porosity which was decreased by a third around the studied pores. The results showed that the latter differentiated themselves within a groundmass fabric more porous than the one currently surrounding the

A spectral line survey in the 2 mm and 1.3 mm windows toward the carbon rich envelope of IRC +10216

We present the results of our spectral line surveys in the 2 mm and 1.3 mm windows toward the carbon rich envelope of IRC +10216. Totally 377 lines are detected, among which 360 lines are assigned to 57 known molecules (including 29 rare isotopomers and 2 cyclic isomers). Only 17 weak lines remain unidentified. Rotational lines of isotopomers 13CCH and HN13C are detected for the first time in IRC +10216. The detection of the formaldehyde lines in this star is also confirmed. Possible abundance difference among the three 13C substituted isotopic isomers of HC3N is reported. Isotopic ratios of C and O are confirmed to be non-solar while those of S and Si to be nearly solar. Column densities have been estimated for 15 molecular species. Modified spectroscopic parameters have been calculated for NaCN, Na13CN, KCN and SiC2. Transition frequencies from the present observations were used to improve the spectroscopic parameters of Si13CC, 29SiC2 and 30SiC2.Comment: 17 pages of text, 18 pages of 14 tables, 35 pages of 4 figures, a typo corrected in Abstrac

A Comparison of Human Development in Psychology and Nahj al-Balaghah

For downloading the full-text of this article please click here.Background and Objective: From the viewpoint of psychologists, creation of human from birth to death has various stages, namely fetus, childhood, adolescence, youth, middle age, and old age. Apart from biological and cognitive features, these stages have particular social and emotional characteristics which transcend individuals. Imams (PBUT) have paid particular attention to educational recommendations for different ages due to their special characteristics. In this regard, the recommendations of Imam Ali (PBUH) considering ways of treating children, adolescents, and young people indicate his awareness of the difference in physical, cognitive and psychological characteristics and age-specific needs of individuals. Therefore, the present study was conducted with the aim of examining the developmental stages of human in Nahj al-Balaghah from Imam Ali's viewpoints and that of psychology.Method: This study has adopted an analytical-library approach. After studying different books of psychology and Nahj al-Balaghah, the developmental stages of human, and its different characteristics were described. Books from the Islamic and religious sciences, especially those related to the words of Imam Ali in Nahj al-Balaghah as well as books related to the developmental psychology, and articles related to the religious field and psychology were used. During this research, all ethical issues were observed and authors reported no conflict of interests.Results: The findings of psychologists such as Piaget, Eriksson in different embryonic, childhood, adolescence, youth and old age periods are in line with the statements of Imam Ali in Nahj al-Balaghah. From his point of view, each of the stages of development has a special sensitivity that needs to be addressed.Conclusion: The developments in hereditary, social context, psychological and physical factors, and prenatal and postnatal stages were taken into account .In order for individuals to succeed in these stages of growth, beside proper nutrition and a rich environment, education and training tips are very influential. In addition to psychological approaches, in Nahj al-Balaghah issues such as parent-child relationships, making friends, marriage, and communication with the elderly have been pointed out.For downloading the full-text of this article please click here.Please cite this article as: Mousavi SE, Elahi T, Masjedi Arani A, Saleck Ebrahimi L, Jalilpour M, Shahsavari Z. A Comparison of Human Development in Psychology and Nahj al-Balaghah. J Res Relig Health. 2019; 4(5): 129- 140

Perspective from a Younger Generation -- The Astro-Spectroscopy of Gisbert Winnewisser

Gisbert Winnewisser's astronomical career was practically coextensive with the whole development of molecular radio astronomy. Here I would like to pick out a few of his many contributions, which I, personally, find particularly interesting and put them in the context of newer results.Comment: 14 pages. (Co)authored by members of the MPIfR (Sub)millimeter Astronomy Group. To appear in the Proceedings of the 4th Cologne-Bonn-Zermatt-Symposium "The Dense Interstellar Medium in Galaxies" eds. S. Pfalzner, C. Kramer, C. Straubmeier, & A. Heithausen (Springer: Berlin