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3846 items in total found

Journal Articles | 2017

A system dynamics simulation model of a blast furnace for project evaluation

Goutam Dutta and Medha Ashtekar

International Journal of Business and Systems Research

The manufacturing of hot metal in a blast furnace is one of the important parts of an integrated steel plant. In a blast furnace, the quality and productivity of the output (hot metal) depends on a large number of input and operating variables. In this paper, we simulate complex interactions of technological and financial variables. We chose system dynamics principles to simulate the blast furnace for project evaluation as a useful aid to managerial decisions. The model would be used to answer a number of questions related to investment decisions. We simulate the actual production of hot metal, accumulated hot metal production, net works cost and cost of hot metal per ton for a period of 36 months with real data.

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Journal Articles | 2017

Adaptive linguistic weighted aggregation operators in multi-criteria decision making

Manish Aggarwal

Applied Soft Computing

In this paper, we propose new aggregation operators for multi-criteria decision making under linguistic settings. The proposed operators are based on two sets of criteria weights. Besides the primary conventional criteria weights, we introduce a method to deduce secondary criteria weights from the criteria evaluations, which reflect the role of the different criteria in discriminating among the alternatives. The properties of the proposed operators are investigated. An approach for the application of the said operators in a group multi-criteria decision making problem is presented. Following the same, the proposed operators are applied in a case study on supplier selection. The empirical validation of the proposed operators is performed on a set of 12 real datasets.

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Journal Articles | 2017

Institutional discourses and ascribed disability identities

Mukta Kulkarni, K.V.Gopakumar, and Devi Vijay

IIMB Management Review,

In the present study we asked: how do institutional discourses, as represented in mass media such as newspapers, confer identities upon a traditionally marginalised collective such as those with a disability? To answer our question, we examined Indian newspaper discourse from 2001 to 2010, the time period between two census counts. We observed that disability identities—that of a welfare recipient, a collective with human rights, a collective that is vulnerable, and that engages in miscreancy—were ascribed through selective highlighting of certain aspects of the collective, thereby socially positioning the collective, and through the associated signalling of institutional subject positions. Present observations indicate that identities of a collective can be governed by institutional discourse, that those “labelled” can themselves reinforce institutionally ascribed identities, and that as institutional discourses confer identities onto the marginalised, they simultaneously also signal who the relatively more powerful institutional actors are.

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Journal Articles | 2017

Does school climate mean the same thing in the United States as in Mexico? A focus on measurement invariance

Kathan D. Shukla, Tracy E. Waasdorp, Sarah Lindstrom Johnson, Mercedes Gabriela Orozco Solis, Amanda J. Nguyen, Cecilia Colunga Rodríguez, and Catherine P. Bradshaw

Journal of Psychoeducational Assessment

School climate is an important construct for guiding violence prevention efforts in U.S. schools, but there has been less consideration of this concept in its neighboring country Mexico, which has a higher prevalence of violence. The U.S. Department of Education outlined a three-domain conceptualization of school climate (i.e., safe and supportive schools model) that includes engagement, safety, and the school environment. To examine the applicability of this school climate model in Mexico, the present study tested its measurement invariance across middle school students in the United States (n = 15,099) and Mexico (n = 2,211). Findings supported full invariance for engagement and modified-safety scales indicating that factor loadings and intercepts contributed almost equally to factor means, and scale scores were comparable across groups. Partial invariance was found for the environment scales. Results of a multigroup confirmatory factor analysis (MGCFA) consisting of all 13 school climate scales indicated significantly positive associations among all scales in the U.S. sample and among most scales in the Mexico sample. Implications of these findings are discussed.

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Journal Articles | 2017

A two-step latent profile method for identifying invalid respondents in self-reported survey data

Kathan D. Shukla and Timothy Konold

Journal of Experimental Education

Insincere respondents can have an adverse impact on the validity of substantive inferences arising from self-administered questionnaires (SAQs). The current study introduces a new method for identifying potentially invalid respondents from their atypical response patterns. The two-step procedure involves generating a response inconsistency (RI) score for each participant and scale on the SAQ and subjecting the resulting scores to latent profile analysis to identify classes of atypical RI respondent profiles. The procedure can be implemented post–data collection and is illustrated through a survey of school climate that was administered to N = 52,102 high school students. Results of this screening procedure revealed high levels of specificity and expected levels of concordance when contrasted with the results of traditionally used methods of screening items and response time. Contrasts between valid and invalid respondents revealed similar patterns across the three screening procedures when compared across external measures of academics and risk behaviors.

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Journal Articles | 2017

Racial/ethnic differences in perceptions of school climate and its association with student engagement and peer aggression

Timothy Konold, Dewey Cornell, Kathan D. Shukla, and Francis Huang

Journal of Youth and Adolescence

Research indicates that a positive school climate is associated with higher levels of student engagement and lower rates of peer aggression. However, less attention has been given to whether such findings are consistent across racial/ethnic groups. The current study examined whether Black, Hispanic, and White high school students differed in their perceptions of school climate, student engagement, and peer aggression as measured by the Authoritative School Climate survey. In addition, the study tested whether the associations between school climate and both student engagement and peer aggression varied as a function of racial/ethnic group. The sample consisted of 48,027 students in grades 9–12 (51.4 % female; 17.9 % Black, 10.5 % Hispanic, 56.7 % White, and 14.9 % other) attending 323 high schools. Regression models that contrasted racial/ethnic groups controlled for the nesting of students within schools and used student covariates of parent education, student gender, and percentage of schoolmates sharing the same race/ethnicity, as well as school covariates of school size and school percentage of students eligible for free- or reduced-price meals. Perceptions of school climate differed between Black and White groups, but not between Hispanic and White groups. However, race/ethnicity did not moderate the associations between school climate and either engagement or peer aggression. Although correlational and cross-sectional in nature, these results are consistent with the conclusion that a positive school climate holds similar benefits of promoting student engagement and reducing victimization experiences across Black, Hispanic, and White groups.

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Journal Articles | 2017

Association of grade configuration with school climate for 7th and 8th grade students

Marisa Malone, Dewey Cornell, and Kathan Shukla

School Psychology Quarterly

Educational authorities have questioned whether middle schools provide the best school climate for 7th and 8th grade students, and proposed that other grade configurations such as K–8th grade schools may provide a better learning environment. The purpose of this study was to compare 7th and 8th grade students’ perceptions of 4 key features of school climate (disciplinary structure, student support, student engagement, and prevalence of teasing and bullying) in middle schools versus elementary or high schools. Multilevel multivariate modeling in a statewide sample of 39,036 7th and 8th grade students attending 418 schools revealed that students attending middle schools had a more negative perception of school climate than students in schools with other grade configurations. Seventh grade students placed in middle schools reported lower disciplinary structure and a higher prevalence of teasing and bullying in comparison to those in elementary schools. Eighth grade students in middle schools reported poorer disciplinary structure, lower student engagement, and a higher prevalence of teasing and bullying compared to those in high schools. These findings can guide school psychologists in identifying aspects of school climate that may be troublesome for 7th and 8th grade students in schools with different grade configurations. (APA PsycInfo Database Record (c) 2019 APA, all rights reserved)

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Journal Articles | 2017

Family deviance, self-control, deviant lifestyles, and youth violent victimization: A latent indirect effects analysis

Margit Wiesner and Kathan Shukla

Victims & Offenders

Research increasingly explores more complex relations of low self-control and context factors, such as structural constraints that limit behavioral lifestyle options, with violent victimization. The authors extend extant research by examining indirect effects of low self-control and family deviance on violent victimization via deviant lifestyles. The hypothesized full indirect effects model is tested for 233 African American and Hispanic 11th-grade students using latent variable analysis. Results offer strong support for the full indirect effects hypothesis. Results generally support the utility of an integrative framework that includes structural constraints arising from the family setting.

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Journal Articles | 2017

Nuclear energy: A nuclear safety

M P Ram Mohan

Yearbook of International Environmental Law, Oxford University Press

Journal Articles | 2017

Constitutional mandate and judicial initiatives influencing Water, Sanitation and Hygiene (WASH) programmes in India

M P Ram Mohan and Anvita Dulluri

Journal of Water Sanitation and Hygiene for Development

This paper undertakes a thorough review of the legislative and policy framework of water supply and sanitation in India within the larger backdrop of the universal affirmation of right to water and sanitation under the UN WASH initiatives, first articulated under the Millennium Development Goals (MDGs). Recognizing the proactive role played by the Indian judiciary in this regard, the paper examines various patterns of judicial reasoning in realising the right to water and sanitation as Constitutional rights of citizens. The paper observes that through a consistent ‘rights-based’ approach, the Indian judiciary has systematically articulated and achieved the objectives of the UN WASH initiatives long before they were spelled out under the MDGs. The paper highlights the need for the Government to recognise and incorporate judicial insights in implementing developmental projects under the WASH initiatives.

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