Digital forensic text string searching: Improving information retrieval effectiveness by thematically clustering search results

Current digital forensic text string search tools use match and/or indexing algorithms to search digital evidence at the physical level to locate specific text strings. They are designed to achieve 100% query recall (i.e. find all instances of the text strings). Given the nature of the data set, this leads to an extremely high incidence of hits that are not relevant to investigative objectives. Although Internet search engines suffer similarly, they employ ranking algorithms to present the search results in a more effective and efficient manner from the user's perspective. Current digital forensic text string search tools fail to group and/or order search hits in a manner that appreciably improves the investigator's ability to get to the relevant hits first (or at least more quickly). This research proposes and empirically tests the feasibility and utility of post-retrieval clustering of digital forensic text string search results – specifically by using Kohonen Self-Organizing Maps, a self-organizing neural network approach.This paper is presented as a work-in-progress. A working tool has been developed and experimentation has begun. Findings regarding the feasibility and utility of the proposed approach will be presented at DFRWS 2007, as well as suggestions for follow-on research.     

A new retrieval system for a database of 3D facial images

A new retrieval system for a 3D facial image database was designed and its reliability was experimentally examined. This system has two steps, firstly to automatically adjust the orientation of all 3D facial images in a database to that of the 2D facial image of a target person, and then to identify the facial image of the target person from the adjusted 3D facial images in the database using a graph-matching method. From the experimental study [M. Yoshino, K. Imaizumi, T. Tanijiri, J.G. Clement, Automatic adjustment of facial orientation in 3D face image database, Jpn. J. Sci. Tech. Iden. 8 (2003) 41-47], it is concluded that the software developed for the first step will be applicable to the automatic adjustment of facial orientation in the 3D facial image database. In 28 out of 110 sets (25.5%), the 3D image of the target person was chosen as the best match (from a database of 132 3D facial images) according to the similarity of the facial image characteristics based on the graph matching. The 3D facial image of the target person was ranked in the top of 10 of the database in 75 out of 110 sets (68.2%). These results suggest that this system is inadequate for the identification level, but may be feasible for screening method in a small database. It will be necessary to further pursue the possibility of realization of a facial image retrieval system for a large database such as suspects' facial images in future.     

Social support as a moderator for alcohol-related partner aggression during the transition to parenthood

Alcohol-related partner aggression is a pervasive social problem throughout various life stages, including the transition to parenthood. Previous research shows that alcohol use is associated with partner aggression perpetration for both men and women; however, not all individuals who consume alcohol act aggressively. In this study, the moderating effects of general social support and partner-specific support on the association between prepregnancy alcohol use and recent partner physical aggression are investigated using a community sample of 98 pregnant couples. For men, high levels of general appraisal social support (i.e., someone to talk to about one's problems) increases the strength of the association between alcohol use and aggression perpetration, whereas partner-specific emotional support serves as a buffer. For women, general social support is not a significant moderator, but high levels of partner-specific instrumental support strengthens the association between alcohol use and aggression. These results can be applied to prevention and treatment programs for alcohol-related partner aggression.     

The evidential value of peptidase A as a semen typing system

Human erythrocyte peptidase A (Pep A) displays a genetic polymorphism in blacks. Its occurrence in human semen was examined for its possible use as a semen typing system. Studies by starch gel electrophoresis, in which the Pep A was located by an improved method, were carried out on semen, semen stains, and vaginal swabs taken at known times after intercourse. In addition, a large number of vaginal swabs, negative for semen, were taken from females throughout their menstrual cycles and examined for Pep A activity. The results indicated that Pep A typing could be carried out on semen and semen stains. However, it was possible to determine the Pep A type on vaginal swabs only when they had been taken within about 3 h after intercourse.     

Trajectories of non-intimate partner and intimate partner homicides, 1980-1999: The importance of rurality

Research had consistently shown that intimate partner homicide rates had been on a steady downward decline over the past two decades; however, a relatively recent movement in intimate partner homicide research had emphasized the need for further dissecting the aggregate trends by factors such as gender, race, victim-offender relationship, and same-sex partners. Taking this a step forward, this study utilized trajectory analysis for comparing and contrasting non-intimate partner homicide and intimate partner homicide rates over time in order to explore the importance of rurality when investigating intimate partner violence. Results of the analysis indicated that although intimate partner homicide rates had been declining over the 1980-1999 period for the majority of the 1,341 U.S. counties examined, there was evidence that rurality was significantly associated with an increased likelihood of assignment to a non-declining intimate partner homicide trajectory. In light of the findings, the authors also consider how these results can direct future research on intimate partner violence in rural areas.     

The sex ratio and male-on-female intimate partner violence

Two divergent perspectives have been articulated in the literature regarding the effect that an unbalanced sex ratio is speculated to have on male-on-female intimate partner violence. Evolutionary psychology proffers that a high sex ratio (i.e., more men than women in the population) propagates competition among males for female mates. This competition for female mates is thought to engender sexual jealousy among men, which in turn results in male-on-female intimate partner violence. In contrast, the Guttentag and Secord thesis argues that a high sex ratio acts to attenuate rather than amplify male-on-female intimate partner violence because the relatively small number of women in the population makes them more highly valued and respected by men. Using data culled from the Federal Bureau of Investigation's National Incident-Based Reporting System (NIBRS) and the Census, we investigate the relationship between the sex ratio and male-on-female intimate partner violence. We define male-on-female intimate partner violence as violence occurring within a marriage or boyfriend/girlfriend type relationship. Multivariate regression results furnish evidence supporting evolutionary psychology by demonstrating that a high sex ratio increases male-on-female intimate partner violence. Results also show that male-on-female intimate partner violence is higher in cities where more women work. Such a finding further buttresses the logic associated with evolutionary psychology because participation in the workforce is theorized to afford a woman a greater opportunity to meet and interact with men other than her husband or boyfriend.     

Adult violence with the mother and sibling as predictors of partner violence

The present study provides the first available evaluation of how violence with the mother and siblings during adulthood is associated with the occurrence of partner violence in young adults. Because a pattern of reciprocal partner violence is well documented, the authors hypothesized that reciprocal violence would also be found for adults and their mothers and for adults and their siblings. The authors also hypothesized that reciprocal violence with the mother and sisters would explain variance in partner violence even when controlling for other known predictors (poverty, poor family support, stress, anger, low self-esteem). Study participants included 377 college adults (114 men, 263 women; mean age = 24.4 years) who completed questionnaires to report their present violence to and from their mothers, sisters, brothers, and romantic partners. Violence is measured with a modified Conflict Tactics Scale. No sibling gender differences are found in violence reported as adults. Factor analysis confirms good fit for three clusters of reciprocal violence for adults: violence with the mother, violence with siblings, violence with the romantic partner. Violence with the mother and siblings significantly explains variance in partner violence even after controlling for other contextual variables, but only for women. One interpretation of present results is that because women receive less socialization than men to use violence, these two within-family models of violence have more significance for increasing their risk of partner violence. Partner violence prevention programs could include participation of mothers and siblings to enhance development of more peaceful conflict resolution patterns within and outside the family.     

Service providers' reactions to intimate partner violence as a function of victim sexual orientation and type of abuse

In this online vignette study, a national sample of domestic violence shelter service providers (N = 282) completed a 10-item questionnaire about a woman experiencing intimate partner violence (IPV). Scenarios varied in terms of couple sexual orientation (heterosexual or lesbian) and type of abuse (physical or nonphysical). Results indicate that although participants did not overtly discriminate against a woman in a lesbian relationship, they were less likely to perceive her as a victim, and their acceptance of a lesbian as a client was more dependent on their comfort with her than was the case for a woman in a heterosexual relationship. Type of abuse, as expected, had a main effect on many questions, with physical abuse taken more seriously than nonphysical abuse. Scores on the Attitudes Toward Lesbians subscale (Herek) were unrelated to responses. Implications for service providers are discussed.     

Intimate partner violence and the justice system: an examination of the interface

Women entering the court system face a challenging experience, in part, because a courtroom can be an intimidating and difficult place for any person, and in part because women victimized by crimes in which the offender is known to them face distinctive difficulties when they seek the court's remedies. The interface is also made more challenging for women as the literature offers disparate findings as to the efficacy of criminal justice responses and civil remedies. This article briefly explores the unique characteristics of intimate partner violence cases that influence the interface of these victims with the court system. Areviewis provided of research on the criminal justice interventions in cases of intimate partner violence; and research on the efficacy of civil protective orders.     

The recovery of latent text from thermal paper using a simple iodine treatment procedure

Faded, or actively removed text on thermally printed paper samples may be enhanced and retrieved through the use of a simple iodine fuming procedure. The recovery of printed documentation evidence in this fashion is neither affected by prior fingerprint enhancement techniques (such as ninhydrin or DFO), nor by sample age. This method allows, for the first time, evidence to be obtained from completely faded thermal paper samples (receipts, for example) as well as allowing deliberately removed printed text (a consequence of solvent washing pre-treatment in latent fingerprint enhancement procedures) to be recovered.     

The danger assessment: validation of a lethality risk assessment instrument for intimate partner femicide

The Danger Assessment (DA) is an instrument designed to assess the likelihood of lethality or near lethality occurring in a case of intimate partner violence. This article describes the development, psychometric validation, and suggestions for use of the DA. An 11-city study of intimate partner femicide used multivariate analysis to test the predictive validity of the risk factors on the DA from intimate partner femicide cases (N = 310) compared with 324 abused women in the same cities (controls). The results were used to revise the DA (four items added; one "double-barreled" item divided into two), and the calculated weights (adjusted odds ratios) used to develop a scoring algorithm with levels of risk. These levels of risk were then tested with an independent sample of attempted femicides (N = 194) with a final outcome of .90 of the cases included in the area under the receiver operating characteristic (ROC) curve.     

Adult attachment as a risk factor for intimate partner violence: the "mispairing" of partners' attachment styles

This study examined the relationship between intimate partner violence and adult attachment in a sample of 70 couples. The attachment style of each partner and the interaction of the partners' attachment styles were examined as predictors of intimate partner violence. Additional analyses were conducted to examine violence reciprocity and to explore differences in the relationship between attachment and violence using continuous and dichotomous violence measures. Results of hierarchical regression analyses indicated the "mispairing" of an avoidant male partner with an anxious female partner was associated with both male and female violence. When controlling for partner violence, the relationship between attachment and violence was significant for males only. In addition, analyses using a dichotomized violence variable produced different results from analyses using a continuous violence measure. Clinical implications include focusing on the discrepancy between partners' needs for intimacy and distance within the couple as a strategy for treating intimate partner violence.     

International environmental law as a complex adaptive system

Complex adaptive systems are a special kind of self-organizing system with emergent properties and adaptive capacity in response to changing external conditions. In this article, we investigate the proposition that international environmental law, as a network of treaties and institutions, exhibits some key characteristics of a complex adaptive system. This proposition is premised on the scientific understanding that the Earth system displays properties of a complex adaptive system. If so, international environmental law, as a control system, may benefit from the insights gained and from being modelled in ways more appropriately aligned with the functioning of the Earth system itself. In this exploratory review, we found evidence suggesting that international environmental law is a complex system where treaties and institutions self-organize and exhibit emergent properties. Furthermore, we contend that international environmental law as a whole is adapting to exogenous changes through an institutional process akin to natural selection in biological evolution. However, the adequacy of the direction and rate of adaptation for the purpose of safeguarding the integrity of Earth’s life-support system is questioned. This paper concludes with an emphasis on the need for system-level interventions to steer the direction of self-organization while maintaining institutional diversity. This recommendation stands in contrast to the reductionist approach to institutional fragmentation and aims at embracing the existing complexity in international environmental law.