Jesa Kreiner

The impact of entrepreneurial leadership on innovative employee behavior: A multi-group analysis comparing the United States, Serbia, and Bosnia and Herzegovina

Journal of Engineering Mangement and Competitiveness, 2022

In the research of this paper, the center of events is entrepreneurial leadership as a new concep... more In the research of this paper, the center of events is entrepreneurial leadership as a new concept for the work behavior of associates. This study aims to determine the entrepreneurial self-efficiency and inclination of entrepreneurs towards innovation and creativity of entrepreneurs. The research aims to achieve results that reveal the relationship between entrepreneurial leadership and the work behavior of employees. The study tested 360 individuals-subordinates in small and medium enterprises operating in the United States-California, Serbia-Vojvodina, and Belgrade, and Bosnia and Herzegovina-Republika Srpska. Based on the obtained results, a model was made and hypotheses were tested. It was a big problem to harmonize the results of research from these three regions. Careful processing of the data resulted from these results. The results obtained have a significant effect on innovative entrepreneurship, which again aims to determine whether there is entrepreneurial leadership and in what form. The research found that innovative entrepreneurs mediate between entrepreneurial leadership and the innovative behavior of associates. The results obtained in this study confirm the hypothesis that entrepreneurial self-efficiency has an adequate effect on the connection between entrepreneurial leadership and the innovative behavior of employees in the companies in which they work. The results of this research work are intended to achieve the originality of entrepreneurship and small and medium enterprises dealing with innovation and a challenging business environment. According to the findings of numerous authors who deal with this issue, this research is not the first attempt to develop innovative behavior of employees in entrepreneurial small and medium enterprises, but it certainly has a great impact on increasing the effectiveness of entrepreneurial leadership on innovative behavior.

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Probabilistic analysis of data dealing with modeling of analgesic effect of naproxen loaded nanoparticles

SMO'05 Proceedings of the 5th WSEAS international conference on Simulation, modelling and optimization, Aug 17, 2005

This paper is based on interactive work between disciplines of engineering and pharmacy. Authors ... more This paper is based on interactive work between disciplines of engineering and pharmacy. Authors used well known reliability techniques [1] to study the probabilistic effect of pain relieving medicines such as naproxen on animals subjected to pain causing chemical such as acetic acid. Nanoparticles are the first and foremost representative frontiers of colloidal drug delivery systems and have a solid polymer matrix. Nanoparticles are often defined as particulate dispersions having a size range between 30nm and 500 nm. Due to their extreme small size, nanoparticles may be administered through the normal routes of administration and can be used to target a particular organ. This is contrary to regular drugs administered orally which go through gastro-intestinal tract, liver and finally to the heart. From the heart the drug is distributed to all the organs of the body including the particular organ that is being targeted. This approach was used to study the analgesic effect of naproxen loaded nanoparticles. Three types of such nanoparticles containing different matrix materials (1) ethyl cellulose (2) cholesterol and (3) a combination of ethylcellulose and cholesterol are prepared. Naproxen, one of the most commonly used analgesic drugs, is loaded into the above mentioned formulations. The analgesic effect of naproxen was tested by comparing the activity of suspension of a commercial product of naproxen with that of naproxen loaded nanoparticles. The analgesic activity of naproxen-loaded nanoparticles (Dose-2.5mg/kg-bodyweight) following intra-peritoneal administration was assessed by measuring the reduction in number of writhings produced in the albino mice in 15min. upon injecting 0.3ml of 1%-acetic acid intra-peritoneally. To assess the rate and extent of analgesia, the writhings were measured at 1, 12 and 24-hours after the treatment with the control and test preparations. For each of the group, the statistical average of number of writhings is calculated along with standard deviation. The idea is to study the effect of pain relieving effect of naproxen dose (commercial and non commercial) on the animal induced with pain-causing acetic acid. In the end, probability of the animal having normal writhings is calculated. This work is based on the Ph.D. thesis of the first author, Kuchibhotla [2].

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Simulation of data for drug manufacturing using optimization principles

SMO'05 Proceedings of the 5th WSEAS international conference on Simulation, modelling and optimization, Aug 17, 2005

This paper deals with formulation and solution of an optimization problem related to a drug indus... more This paper deals with formulation and solution of an optimization problem related to a drug industry wherein a drug manufacturing experiment is conducted with multiple reagent levels, a single incubation temperature, and a single incubation time. Since various experiments are conducted with multiple values of reagent levels, it is decided to have a common measurement factor for all the experiments for comparison purposes. This factor is taken as a scalar binding factor. This binding factor is expressed as a linear function of reagent levels, incubation temperature, and incubation time. All these three variables are treated as probabilistic and, hence, are supposed to have a certain distribution. It is also assumed that each drug manufacturing experiment is characterized by a single binding value or binding factor. The higher the binding, the experiment is considered better. Further, it is assumed in this study that the mean binding factor is a monotonically non-decreasing function of incubation time. Since the experiments are expensive to run and the cost is proportional to incubation time, and, also, since there is a cost of a reagent, this is a complex problem. It becomes even more complex because the stochastic aspects of the process are to be considered in the optimization problem formulation. This problem dealing with manufacturing of a drug [1, 2] is formulated as an optimization problem.

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Application of safety index approach to reliability study of external tank attach ring of space shuttle

SMO'05 Proceedings of the 5th WSEAS international conference on Simulation, modelling and optimization, Aug 17, 2005

The main aim of this study is to calculate the probabilities of ETA ring falling below the specif... more The main aim of this study is to calculate the probabilities of ETA ring falling below the specified values with fracture toughness and ultimate tensile strength as limit states. This is done using the statistical properties of fracture toughness and ultimate strength of the actual ETA ring specimen. The measurements are taken at various points of the ETA ring. The method used for calculation of the probabilities is the FOSM (First Order Second Moment) method. This method is well documented in literature and gives a reasonably good starting probability values. These estimates can be improved by either advanced reliability methods (AFOSM) or using simulation techniques such as Monte Carlo simulation method.

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Performance Analysis of a Space Shuttle External Tank Attach Ring using Probabilistic Principles

International Journal of Modelling and Simulation, 2001

This work deals with performance analysis of an external tank attach ring of a space shuttle. The... more This work deals with performance analysis of an external tank attach ring of a space shuttle. The shuttle consists of the orbiter and the main engines along with the solid rocket boosters, external tank (ET), and external tank attachment (ETA) ring. The study discussed in this paper is restricted solely to the ETA. Performance analysis in the traditional deterministic sense involves calculation of margin of safety values for yield and ultimate allowable stresses. Performance analysis using probabilistic principles uses probabilistic margins of safety (PMS). These values are determined for various parts of ETA ring cross-sections and a comparison is made between the two sets of results. This study also indicates that there is a good built-in margin of safety in the ETA ring components as indicated by high PMS values, and it further includes the existing results for membrane and grid forces of ETA ring after incorporating the uncertainty of these variables based on the existing data in the literature and past experience at NASA.

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A computer aided technique for shaft design through monte carlo simulation

Computers & Structures, Jul 1, 1994

The paper predicts the probability of failure of shafts subjected to reverse bending during the p... more The paper predicts the probability of failure of shafts subjected to reverse bending during the process of transfer of power. Since reliability and probability of failure are complementary to each other, the safety levels are calculated in terms of reliability factors. The shafts considered in this study are subjected to tension, compression, bending or torsional loads acting singly or in

Assessment of Residual Tensile Strength of Carbon/Epoxy Composites Subjected to Low-Energy Impact

Journal of Aerospace Engineering, Oct 1, 2008

This paper presents the results of an experimental study to investigate the effects of impact loa... more This paper presents the results of an experimental study to investigate the effects of impact loading on the residual tensile strength of woven graphite epoxy laminates with a toughened resin system. In this study, both cross-ply, [0∕90]6 , and angle-ply, [±45]6 , laminate lay-up configurations were studied and compared. Test specimens were subjected to various levels of impact loading, after which tensile pull tests were performed to determine the residual tensile strength properties. The study results demonstrated that impact damage causes a significant reduction in tensile strength properties of woven cross-ply [0°/90°] laminates. For example, cross-ply laminated composite specimens subjected to the lowest impact level, 6.8 J , exhibited a 25% decrease in ultimate tensile strength. Angle-ply woven laminates [±45°] , however, exhibited an 18% increase in ultimate tensile strength after being subjected to 6.8 (J) impact. This characteristic of increasing tensile strength in [±45°] specimens is an example...

The impact of entrepreneurial leadership on innovation management and its measurement validation

International Journal of Innovation Science, 2017

Purpose This paper aims to validate the measurement of entrepreneurial leadership (EL) in the con... more Purpose This paper aims to validate the measurement of entrepreneurial leadership (EL) in the context of innovation management and strategic entrepreneurship, and to examine the relationship between EL and the innovation process (IP). It proposes the measurement of EL and outlines the reason and the importance of EL in the IP. The study further examines whether the IP would have direct impact on innovation performance. Design/methodology/approach The paper opted for an explanatory and confirmatory study using a quantitative approach employing an online survey/questionnaire distributed to two groups of employees representing middle and senior management having mixed background such as finance, marketing, operations and management. The first group consists of 222 respondents spread across multiple industries, and the second group consists of 60 respondents mainly from the financial services industry to validate the measurement of the EL construct. Findings The paper provides empirical...

Probabilistic Analysis of Data Dealing With Modeling of Analgesic Effect Of Naproxen Loaded Nanoparticles

This paper is based on interactive work between disciplines of engineering and pharmacy. Authors ... more This paper is based on interactive work between disciplines of engineering and pharmacy. Authors used well known reliability techniques [1] to study the probabilistic effect of pain relieving medicines such as naproxen on animals subjected to pain causing chemical such as acetic acid. Nanoparticles are the first and foremost representative frontiers of colloidal drug delivery systems and have a solid polymer matrix. Nanoparticles are often defined as particulate dispersions having a size range between 30nm and 500 nm. Due to their extreme small size, nanoparticles may be administered through the normal routes of administration and can be used to target a particular organ. This is contrary to regular drugs administered orally which go through gastro-intestinal tract, liver and finally to the heart. From the heart the drug is distributed to all the organs of the body including the particular organ that is being targeted. This approach was used to study the analgesic effect of naproxen loaded nanoparticles. Three types of such nanoparticles containing different matrix materials (1) ethyl cellulose (2) cholesterol and (3) a combination of ethylcellulose and cholesterol are prepared. Naproxen, one of the most commonly used analgesic drugs, is loaded into the above mentioned formulations. The analgesic effect of naproxen was tested by comparing the activity of suspension of a commercial product of naproxen with that of naproxen loaded nanoparticles. The analgesic activity of naproxen-loaded nanoparticles (Dose-2.5mg/kg-bodyweight) following intra-peritoneal administration was assessed by measuring the reduction in number of writhings produced in the albino mice in 15min. upon injecting 0.3ml of 1%-acetic acid intra-peritoneally. To assess the rate and extent of analgesia, the writhings were measured at 1, 12 and 24-hours after the treatment with the control and test preparations. For each of the group, the statistical average of number of writhings is calculated along with standard deviation. The idea is to study the effect of pain relieving effect of naproxen dose (commercial and non commercial) on the animal induced with pain-causing acetic acid. In the end, probability of the animal having normal writhings is calculated. This work is based on the Ph.D. thesis of the first author, Kuchibhotla [2].

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Simulation of data for drug manufacturing using optimization principles

This paper deals with formulation and solution of an optimization problem related to a drug indus... more This paper deals with formulation and solution of an optimization problem related to a drug industry wherein a drug manufacturing experiment is conducted with multiple reagent levels, a single incubation temperature, and a single incubation time. Since various experiments are conducted with multiple values of reagent levels, it is decided to have a common measurement factor for all the experiments for comparison purposes. This factor is taken as a scalar binding factor. This binding factor is expressed as a linear function of reagent levels, incubation temperature, and incubation time. All these three variables are treated as probabilistic and, hence, are supposed to have a certain distribution. It is also assumed that each drug manufacturing experiment is characterized by a single binding value or binding factor. The higher the binding, the experiment is considered better. Further, it is assumed in this study that the mean binding factor is a monotonically non-decreasing function of incubation time. Since the experiments are expensive to run and the cost is proportional to incubation time, and, also, since there is a cost of a reagent, this is a complex problem. It becomes even more complex because the stochastic aspects of the process are to be considered in the optimization problem formulation. This problem dealing with manufacturing of a drug [1, 2] is formulated as an optimization problem.

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Maintaining Currency and Staying at the Cutting Edge of the Profession

Volume 3: Design; Tribology; Education, 2008

Educators and employers have traditionally worked together to identify engineering skills which r... more Educators and employers have traditionally worked together to identify engineering skills which require ongoing updating and upgrading in order to avoid obsolescence. That, along with the need to work successfully in multidisciplinary environments, has become increasingly critical in staying competitive in the face of rapidly changing technology and current trends toward outsourcing of engineering jobs. Mechanical engineers, specifically, are continuously confronted with the requirement to maintain proficiency in CAD and FEA tools, evolving multiplicity of design materials and fabrication processes and increased sophistication of design components. Another aspect of a successful engineer entails the ability to communicate with both engineers and non-engineers who frequently are in positions to approve or cancel projects which may affect success and/or survival of the company where engineers work. A recent survey was conducted of engineering alumni of the mechanical engineering progr...

Energy Efficiency of Industrial Oils

Tribology Transactions, 1999

Lubricants influence energy efficiency mainly through reducing energy losses, which include churn... more Lubricants influence energy efficiency mainly through reducing energy losses, which include churning losses and friction losses in hydrodynamic, elastohydrodynamic and boundary lubrication regimes. The total energy loss depends on lubricant viscosity and chemical composition. Different sources of lubricant-related power losses in industrial systems are described. The dependence of churning and friction losses on oil properties is analyzed.Viscosity shear-thinning and pressure-thickening

4 th International Engineering and Construction Conference ASCE Los Angeles Section International Committee

Principal

This paper is based on interactive work between disciplines of engineering and pharmacy. Authors ... more This paper is based on interactive work between disciplines of engineering and pharmacy. Authors used well known reliability techniques [1] to study the probabilistic effect of pain relieving medicines such as naproxen on animals subjected to pain causing chemical such as acetic acid. Nanoparticles are the first and foremost representative frontiers of colloidal drug delivery systems and have a solid polymer matrix. Nanoparticles are often defined as particulate dispersions having a size range between 30nm and 500 nm. Due to their extreme small size, nanoparticles may be administered through the normal routes of administration and can be used to target a particular organ. This is contrary to regular drugs administered orally which go through gastro-intestinal tract, liver and finally to the heart. From the heart the drug is distributed to all the organs of the body including the particular organ that is being targeted. This approach was used to study the analgesic effect of naproxen...

U.S.A

The main aim of this study is to calculate the probabilities of ETA ring falling below the specif... more The main aim of this study is to calculate the probabilities of ETA ring falling below the specified values with fracture toughness and ultimate tensile strength as limit states. This is done using the statistical properties of fracture toughness and ultimate strength of the actual ETA ring specimen. The measurements are taken at various points of the ETA ring. The method used for calculation of the probabilities is the FOSM (First Order Second Moment) method. This method is well documented in literature and gives a reasonably good starting probability values. These estimates can be improved by either advanced reliability methods (AFOSM) or using simulation techniques such as Monte Carlo simulation method.

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ESDA2008-59597 Maintaining Currency and Staying at the Cutting Edge of the Profession

Educators and employers have traditionally worked together to identify engineering skills which r... more Educators and employers have traditionally worked together to identify engineering skills which require ongoing updating and upgrading in order to avoid obsolescence. That, along with the need to work successfully in multidisciplinary environments, has become increasingly critical in staying competitive in the face of rapidly changing technology and current trends toward outsourcing of engineering jobs. Mechanical engineers, specifically, are continuously confronted with the requirement to maintain proficiency in CAD and FEA tools, evolving multiplicity of design materials and fabrication processes and increased sophistication of design components. Another aspect of a successful engineer entails the ability to communicate with both engineers and non-engineers who frequently are in positions to approve or cancel projects which may affect success and/or survival of the company where engineers work. A recent survey was conducted of engineering alumni of the mechanical engineering progr...

Influence of entrepreneurs on job satisfaction and organizational commitment of employees

by Dragana Sajfert2 and Jesa Kreiner

Journal of Engineering Management and Competitiveness

In this paper, we analyze reliability, correlations, regression of employee obligations, compare ... more In this paper, we analyze reliability, correlations, regression of employee obligations, compare employee regression, job satisfaction regression, and hierarchical regression analysis. As techniques for comparison of entrepreneurs and employees are significant for analysis of positive correlations between the determinants, we used 36 independent samples and 210 individuals. The findings reveal that: (1) The results of the research confirmed the existence of a statistically significant positive correlation between the determinants of job satisfaction and organizational commitment on one hand, and the work of entrepreneurs, on the other; (2) The results of the survey compare the relationship between entrepreneurs and employee job satisfaction and organizational commitment, adding a significant increase in the importance of the construct; (3) Entrepreneurship has a relative correlation in relation to job satisfaction, and organizational commitment, and thus increases the scope of tasks...

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Ethical and professional issues facing engineers in global settings

Very frequently the members of the engineering profession are blamed for a variety of events that... more Very frequently the members of the engineering profession are blamed for a variety of events that have adverse effects on society, the environment, and safety of humans and ecosystems. While technological innovations generally do improve the living standards of people, there were, and are, occasions that cause unforeseen consequences which may prove to be undesirable at best and lethal at worst. In order to meet challenges of the times, engineers must equip themselves with both moral responsibilities and awareness of the legal implications for the decisions made in the course of practice of their professional. duties. Additionally, it is of major significance that engineers be capable of informing the general public with the alternatives that must be considered when engineering approaches are being considered. It is of particular importance to communicate this awareness and skills to young engineers about to enter the professional world where they have to work in multinational teams...

Development of a method to test adequacy of existing personality tests for a career in engineering

The success of any industry depends on the morale as well as the hard work and dedication of its ... more The success of any industry depends on the morale as well as the hard work and dedication of its staff as well as the compatibility of the person for a career in the particular line of work. These three factors -morale, hard work and dedication are not actually independent but have some kind of correlation between them. It will be suffice to say that morale is the base factor which will affect the other two parameters, all affecting the success and affecting the output of the industry in consideration. A method is developed based on this research to test the adequacy of the existing personality tests.

Development of a new traffic flow model

The models proposed by Greenshields (1934) [1] and Greenberg (1959) [2] are very popular and have... more The models proposed by Greenshields (1934) [1] and Greenberg (1959) [2] are very popular and have been in use for quite sometime. These models can be considered as classic models. The intent of this research paper is to develop an efficient and improved traffic flow model to predict the space mean speed, us, in terms of the mean free flow speed, uf, and the density, k. The Greenberg model [2] (which is based on fluid-flow analogy concept) satisfies the boundary condition only at jam density, kj. It violates the boundary condition at zero density, k, in the sense that it can only be attained at infinitely high speeds according to Khisty and Lall [3]. The Greenshields model [1] on the other hand gives a low correlation coefficient. The intent of this research work is to specifically arrive at an improved version of Greenberg model [2] (Putcha, Kreiner, Tadi, Manop Model). The Putcha, Kreiner, Tadi, Manop model will be accomplished by expansion of natural log expression in Greenberg ex...

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