Evaluation of machine-aided indexing†

The Defense Documentation Center (DDC), a field activity of the Defense Supply Agency, implemented an automated indexing procedure in October 1973. This Machine-Aided Indexing (MAI) System [1] had been under development since 1969. The following is a report of several comparisons designed to measure the retrieval effectiveness of MAI and manual indexing procedures under normal operational conditions.Several definitions are required in order to clarify the MAI process as it pertains to these investigations. The MAI routines scan unedited text in the form of titles and abstracts. The output of these routines is called Candidate Index Terms. These word strings are matched by computer against an internal file of manually screened and cross-referenced terms called a Natural Language Data Base (NLDB). The NLDB differs from a standard thesaurus in that there is no related term category. Word strings which match the NLDB are accepted as valid MAI output. The mismatches are manually screened for suitability. Those accepted are added to the NLDB. If now, the original set of Candidate Index Terms is matched against the updated NLDB, the matched output is unedited MAI. If both the unedited matches and mismatches are further structured in accession order and sent to technical analysts for review, the output of that process is called edited MAI.The tests were designed to (a) compare unedited MAI with manual indexing, holding the indexing language and the retrieval technique constant; (b) compare edited MAI with unedited MAI, holding both the indexing and the retrieval technique constant; and (c) compare two different retrieval techniques, called simple and complex, while holding the indexing constant.     

Three reflections on assessing safety training needs: A case study

Needs assessment plays an important role in training and human performance improvement efforts, but the literature contains little research on this topic. This study extended previous research on the Performance Analysis for Training (PAT) model of needs assessment by examining its implementation to determine environmental and occupational health and safety training needs in a government agency. Using case study methodology and the lens of responsive evaluation, this study resulted in three perspectives about the actual needs assessment implementation. The three professionals' distinct areas of expertise (evaluation, health and safety, human resource development) informed the case in unique ways. The results can be used to improve the PAT model and also to give human resource development and performance improvement professionals insights about nuances of needs assessment practice.     

Teacher supervision and evaluation challenges: Canadian perspectives on overall instructional leadership

This inquiry focuses on the overall instructional leadership approaches used by exemplary principals in three high performing Canadian provinces to overcome three persistent obstacles to effective teacher supervision and evaluation: (a) the management challenge, (b) the complexity challenge, and (c) the learning challenge. Analysis of data collected from interviews, focus groups, observations, field notes, documents, artifacts, and reflective research journals yielded the following four assertions: (a) Shared, distributed, and collective approaches to overall instructional leadership deepen and widen impact. (b) Effective supervision and evaluation are part of a career-long continuum of practice that fosters teacher growth while ensuring quality teaching. (c) There are multiple learning pathways to effective overall instructional leadership. (d) Policy contexts that place teacher supervision and evaluation practice within a broader conception of overall instructional leadership are beneficial.     

Mothers’ and Fathers’ Autonomy-Supportive and Controlling Behaviors: An Analysis of Interparental Contributions

Objective. The goal of this study was to examine how mothers and fathers contribute to each other’s autonomy supportive and controlling behaviors toward their child. Design. The participants were heterosexual parental dyads from two prospective studies (Study 1, n = 289; Study 2, n = 202). Mothers and fathers completed questionnaires assessing their autonomy supportive and controlling behaviors toward their adolescent child. Results. In both studies, results from structural equation modeling revealed reciprocal partner effects where mothers’ autonomy support at Time 1 predicted fathers’ autonomy support at Time 2, and fathers’ autonomy support at Time 1 predicted mothers’ autonomy support at Time 2. Reciprocal partner effects were also observed for controlling behaviors. These reciprocal relations were not statistically different across mothers and fathers. Conclusions. These results provide support for interparental contributions regarding autonomy supportive and controlling parenting behaviors. Mothers and fathers should thus be aware that their parenting behaviors can be influenced by each other, including both positive and negative parenting behaviors.     

Trajectory tracking for a quadrotor under wind perturbations: sliding mode control with state-dependent gains

The problem of position tracking of a mini drone subject to wind perturbations is investigated. The solution is based on a detailed unmanned aerial vehicle (UAV) model, with aerodynamic coefficients and external disturbance components, which is introduced in order to better represent the impact of the wind field. Then, upper bounds of wind-induced disturbances are characterized, which allow a sliding mode control (SMC) technique to be applied with guaranteed convergence properties. The peculiarity of the considered case is that the disturbance upper bounds depend on the control amplitude itself (i.e. the system is nonlinear in control), which leads to a new procedure for the control tuning presented in the paper. The last part of the paper is dedicated to the analysis and reduction of chattering effects, as well as investigation of rotor dynamics issues. Conventional SMC with constant gains, proposed first order SMC, and proposed quasi-continuous SMC are compared. Nonlinear UAV simulator, validated through in-door experiments, is used to demonstrate the effectiveness of the proposed controls.     

The Concept of Metamorphosis and its Metaphors

The article examines a number of links between the metaphorical uses of the concept of metamorphosis in literature and the various changes of the meaning of the concept that took place at the beginning of the modern scientific age between the 17th and 19th centuries, a period during which the notion of metamorphosis resurfaced in conflict with evolutionist thinking. We present the extent to which the concept of animal metamorphosis, the object of multiple redefinitions over the course of this historical period, became the vector of a very strong metaphorical meaning, which emerged in the literature of the period and survives to this day in certain children’s storybooks belonging to what we term the genre of “realistic fiction”. We intend, from a pedagogical standpoint, to identify which specific attributes of these metaphors exist in those storybooks, and to gauge the extent to which those attributes contradict the scientific characteristics and fictional representations of the concept of metamorphosis.     

Asking queer(er) questions: epistemological and methodological implications for qualitative inquirers

This collection of distinct scholarly essays deliberatively turns to queer experience and theorizing as a resource for constructing vibrant qualitative research designs. Queer theory offers a breadth of epistemological and methodological possibilities for qualitative projects that are too frequently overlooked for many reasons. These reasons include frequently strict association of queer theory with queer research topics and researchers, as well as a concurrent reluctance to interrogate the representational needs of heterosexist culture served by the metaphor of the ‘closet.’ Queer theory also compels inquiry that takes up the unique circumstances of queer subjects. Locating educational inquiry within globally complex socio-historical dynamics and a post-Obergefell/post-2016 election U.S. context, this article poses multiple trajectories through which various scholars explore queer(er) qualitative inquiry in educational studies. These perspectives invite researchers to rethink qualitative inquiry designs through engagement with the queer, inclusive of research topics not initially perceived to be queer.     

Hip thrust-based PAP effects on sprint performance of soccer players: heavy-loaded versus optimum-power development protocols

This study aimed to investigate the acute effects of two barbell hip thrust-based post-activation potentiation (PAP) protocols on subsequent sprint performance. Using a crossover design, eighteen soccer athletes performed 5 m, 10 m, and 20 m sprints before and 15 s, 4 min, and 8 min after two PAP protocols. The PAP conditioning activities consisted of hip thrust exercises loaded with either 85% 1RM or a load for optimum power development. The resulting 5 m and 10 m sprint performances were impaired at 15 s following both protocols. At 4 min and 8 min, meaningful improvements were observed for the three sprint distances following both of the protocols. Meaningful differences were found when comparing the two PAPs over time: greater impairments in 5 m and 10 m following the 85% of 1 RM protocol after 15 s, and greater improvements in all sprint distances after 4 min and 8 min following the optimum power development protocol. Positive correlations between the hip thrust's 1RM and power values and the overall individual PAP responses were found. This investigation showed that both heavy-loaded and optimum-power hip thrust exercises can induce a PAP response, with the optimum-power development protocol preferred due its higher efficiency.     

Proportional Reasoning among 7th Grade Students with Different Curricular Experiences

Contextual problems involving rational numbers and proportional reasoning were presented to seventh grade students with different curricular experiences. There is strong evidence that students in reform curricula, who are encouraged to construct their own conceptual and procedural knowledge of proportionality through collaborative problem solving activities, perform better than students with more traditional, teacher-directed instructional experiences. Seventh grade students, especially those who study the new curricula, are capable of developing their own repertoire of sense-making tools to help them to produce creative solutions and explanations. This is demonstrated through analysis of solution strategies applied by students to a variety of rate problems.