Enhancing security of fingerprints through contextual biometric watermarking

This paper presents a novel digital watermarking technique using face and demographic text data as multiple watermarks for verifying the chain of custody and protecting the integrity of a fingerprint image. The watermarks are embedded in selected texture regions of a fingerprint image using discrete wavelet transform. Experimental results show that modifications in these locations are visually imperceptible and maintain the minutiae details. The integrity of the fingerprint image is verified through the high matching scores obtained from an automatic fingerprint identification system. There is also a high degree of visual correlation between the embedded images, and the extracted images from the watermarked fingerprint. The degree of similarity is computed using pixel-based metrics and human visual system metrics. The results also show that the proposed watermarked fingerprint and the extracted images are resilient to common attacks such as compression, filtering, and noise.     

An Improved Version of a Tool Mark Comparison Algorithm

Chumbley et al. (2010) described a statistically based algorithm for comparing pairs of tool marks. They presented empirical evidence that the algorithm produces well‐separated similarity score values for “matching” and “non‐matching” pairs of tool marks. However, the algorithm has two substantial weaknesses. First, it is “uncalibrated” in the sense that error rates can be determined only through empirical investigation. Second, it relies on a randomized test and can lead to different similarity scores when the algorithm is repeatedly applied to the same pair of tool marks. We present an improved version of the procedure, which eliminates the randomized scores and yields more consistent and predictable error rate control. This is accomplished by replacement of a random sampling step from the original algorithm with a deterministic process. We demonstrate the improved algorithm and compare its performance to the original by applying to known “matching” and “non‐matching” pairs of tool marks.     

Legislative Bellwethers: The Role of Committee Membership in Parliamentary Debate

Political parties and legislators use legislative debates to establish their reputation, challenge rivals, and engage in coalition management, among many other tasks. Yet, existing theories on parliamentary debates have abstracted away from the need for information and expertise, which are costly to acquire. Drawing on the “informational” perspective on legislative organization, we address this problem by arguing that party leaders use committees as training arenas for their backbenchers. They task their assigned members with acquiring specific expertise and then rely heavily on those members during the corresponding debates. We turn to the Portuguese legislature, from 2000 to 2015, to discuss how saliency, government dynamics, and party size affect the use of experts. We test this theory using a novel approach to classify speeches that leverages the texts of legislation as training data for a supervised approach.     

Preis der Fritz Thyssen Stiftung für sozialwissenschaftliche Aufsätze des Zeitschriftenjahrgangs 1999

Mitteilungen und Berichte

     

Correlation of microscopic and mitochondrial DNA hair comparisons

Expert opinions regarding the microscopic comparison of human hairs have been accepted routinely in courts for decades. However, with the advent of mitochondrial DNA (mtDNA) sequencing, an assessment can be made of the association by microscopic hair comparisons in casework between a questioned hair and reference hairs from an individual. While each method can be used separately, the two analytical methods can be complementary and together can provide additional information regarding source association. Human hairs submitted to the FBI Laboratory for analysis between 1996 and 2000 were reviewed. Of 170 hair examinations, there were 80 microscopic associations; of these, only nine were excluded by mtDNA. Importantly, 66 hairs that were considered either unsuitable for microscopic examinations or yielded inconclusive microscopic associations provided mtDNA results. Only six hairs did not provide sufficient mtDNA, and only three yielded inconclusive results. Consistency was observed in exculpatory results with the two procedures. This study demonstrates the utility of microscopic hair examinations and the strength of combining microscopic analysis with mtDNA sequencing.     

At-risk factors for the adolescent mother and her infant

This article describes some at-risk features for the adolescent mother and her infant. The inadequacies of the adolescent mother may be manifest in her inability to provide for herself or her infant, and in difficulties in relating to a mate in a suitable fashion since she is still dependent on and, to some extent, symbiotic with her own mother. Complications, such as the increased possibility of having crises in pregnancy, a premature birth, giving up the baby for adoption, malnutrition, decreased stimulation, and divided mothering, are detailed. Compared to infants of adult mothers, offspring of adolescent mothers have a greater risk later on of conduct disorders, absence of both parents, and placement in foster homes or institutions. The adolescent mother's dynamics seem related to oedipal conflicts, wishes to mother and be mothered, and a predominance of symbiotic or other preoedipal conflicts. Becoming a mother in adolescence may be based on efforts to separate from infantile objects, an attempt to make up for the loss thereof, or substitution and avoidance of separation-individuation conflicts; or it might be an accident to avoid regression. At-risk factors are listed for the psychiatrist and pediatrician to observe in the adolescent mother and her infant in order to be alert to the possibilities of increased complications.Past President of American Society for Adolescent Psychiatry. Received his M.D. from the University of Toronto Faculty of Medicine in 1948. Trained in psychiatry and child psychiatry in New Orleans. Main interests include group and family therapy, separation and attachment processes, and early child development, particularly in prematures.