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Smartphone and Tablet Application (App) Life Cycle Characterization via Apple App Store Rank

Abstract

With the rapid growth of the smartphone and tablet market, mobile application (App) industry that provides a variety of functional devices is also growing at a striking speed. Product life cycle (PLC) theory, which has a long history, has been applied to a great number of industries and products and is widely used in the management domain. In this study, we apply classical PLC theory to mobile Apps on Apple smartphone and tablet devices (Apple App Store). Instead of trying to utilize often-unavailable sales or download volume data, we use open-access App daily download rankings as an indicator to characterize the normalized dynamic market popularity of an App. We also use this ranking information to generate an App life cycle model. By using this model, we compare paid and free Apps from 20 different categories. Our results show that Apps across various categories have different kinds of life cycles and exhibit various unique and unpredictable characteristics. Furthermore, as large-scale heterogeneous data (e.g., user App ratings, App hardware/software requirements, or App version updates) become available and are attached to each target App, an important contribution of this paper is that we perform in-depth studies to explore how such data correlate and affect the App life cycle. Using different regression techniques (i.e., logistic, ordinary least squares, and partial least squares), we built different models to investigate these relationships. The results indicate that some explicit and latent independent variables are more important than others for the characterization of App life cycle. In addition, we find that life cycle analysis for different App categories requires different tailored regression models, confirming that inner-category App life cycles are more predictable and comparable than App life cycles across different categories.

Open access
The Role of Migration Experience in Migrants’ Destination Choice

Abstract

In this article, we employ a panel household survey from Tajikistan to study labor migrants’ location choices in Russia. We find that labor migrants from Tajikistan consider a wide variety of economic, demographic, and geographical characteristics of Russian regions when making location choices. We also find that experienced migrants are less responsive to current regional characteristics that might suggest path dependence in destination choices by experienced migrants.

Open access
CRISPR-Cas9 in agriculture: Approaches, applications, future perspectives, and associated challenges

Abstract

The discovery of an adaptive immune system especially in archae and bacteria, CRISPR/Cas has revolutionized the field of agriculture and served as a potential gene editing tool, producing great excitement to the molecular scientists for the improved genetic manipulations. CRISPR/Cas9 is a RNA guided endonuclease which is popular among its predecessors ZFN and TALEN’s. The utilities of CRISPR from its predecessors is the use of short RNA fragments to locate target and breaking the double strands which avoids the need of protein engineering, thus allowing time efficiency measure for gene editing. It is a simple, flexible and highly efficient programmable DNA cleavage system that can be modified for widespread applications like knocking out the genes, controlling transcription, modifying epigenomes, controlling genome-wide screens, modifying genes for disease and stress tolerance and imaging chromosomes. However, gene cargo delivery system, off target cutting and issues on the safety of living organisms imposes major challenge to this system. Several attempts have been done to rectify these challenges; using sgRNA design software, cas9 nickases and other mutants. Thus, further addressing these challenges may open the avenue for CRISPR/cas9 for addressing the agriculture related problems.

Open access
Production and Marketing of Carp Species in Rupandehi, Nepal

Abstract

The research was conducted from January 2019 to June 2019 to study the fish production and marketing system in fish zone, Rupandehi. Altogether 95 respondents including 27 small farmers, 35 medium farmers and 33 large farmers were selected for household survey using simple random sampling for the study. Statistical tools, Ms- excel and SPSS of version 23 were used for data analysis. From the study, it was evident that, six species of carps of fingerlings size were stocked with high average number of common carps (3885.5/ha.) followed by silver carp (3880.5/ha). The average production of fish species was 6.06ton/ha which is slightly higher than the national average. The observed data revealed that, marketing of major quantity of fish was from on farm sale i.e. 55.78% followed by local market sale (18.94%), live fish sale in retailers (5.26%). Similarly, percentage of farmers selling fish to wholesaler, consumers, retailers and neighbours were 63.3%, 30.5%, 26.5% and 26.3% respectively. Cost and returns analysis showed average B/C ratio of 2.13. Problem ranking using 5 point scale value showed high cost of feed as the most serious problem with index value of 0.94 in the study area.

Open access
Analysis of Outbound Logistics Channels for Construction Material

Abstract

Outbound logistics channels are of crucial importance for an efficient construction materials logistics management and impacts on customer satisfaction. However, there is limited knowledge of the outbound logistics channels for construction material in Nigeria. This study aims to identify and examine the current outbound logistics channels used by the Nigerian construction material manufacturing industries. A quantitative research method using a case study approach was adopted in this research. The purposive sampling technique was chosen, where six construction material manufactured and distributed within five states capital and Abuja in the North-central region of Nigeria were selected for this study. A research instrument was developed and used in conjunction with an observation protocol in the form of a template. The data were collected through observations, direct measurement onsite and archival records of transactions. A descriptive method of data analysis was employed to analyse the data. Our findings indicate that there exist six alternative outbound logistics channels that can be used separately or in combination with each other to deliver materials to end users. The study concludes that the research finding provides a potential knowledge and understanding of the manufacturers’ outbound logistics channels that can be used at the start of a project to accomplish effective planning and delivery of the whole project. The study also established the average transportation cost per average ton and average transportation cost per average distance driven for construction material delivery. This information can be used for construction material transportation management.

Open access
Capital Account Liberalization in Morocco: Is it Compatible with Fixed or Flexible Exchange Rate Regime?

Abstract

This paper examines the opportunity of exchange rate regime flexibilization in Morocco under the policy of capital account liberalization. Basing on our findings in Ezzahid and Maouhoub (2014), we develop a new theoretical game model with four economic agents, namely: monetary authorities, government, foreign firms and domestic firms. We explore the optimal exchange rate regime for Morocco under new conditions such as the presence of a compensation fund effect, restrictions on capital outflows, etc. Starting with a first simulation based on current economic parameters, the results show that losses under a flexible exchange rate regime are lower than losses under a fixed exchange rate regime. Varying different parameters allow discovering the ‘appropriate level’ from which monetary authorities should move toward the flexible exchange rate.

Open access
Construction Micro, Small, and Medium Enterprises (CMSMEs) Innovations

Abstract

Innovation is at the core of micro, small and medium enterprises (MSMEs)/construction micro, small, and medium enterprises (CMSMEs) world over. Be that as it may, the overwhelming sorts of innovation among enduring and effective CMSMEs, and the effects of such innovation(s) on the achievement of the CMSMEs is hazy. The purpose of this paper is to investigate the transcendent sorts of innovation among the successful construction micro, small, and medium enterprises. The examination utilized subjective research technique to exploratively decide the sorts of innovations. Recorded interviews comprised the exploration of information from 43 CMSMEs through 14 states out of the 19 states constituting northern Nigeria. While a semi-structured interview with open-ended questions was utilized to gather information through judgmental and snowballing examining procedure at stage 1 and 2 individually. Information was transcribe interpreted, open and axial codes examined and interpreted. The outcome uncover product innovation as the main type of innovation among different types of innovation and generally in charge of the accomplishment of the CMSMEs considered. The investigation improves the collection of learning regarding basic types of innovations within CMSMEs and proposes that effective CMSMEs give more consideration to product innovation to trigger their prosperity and different types of innovation. Moreover, the aftereffect of the examination proposed failing CMSMEs can endure when they focus on product innovation.

Open access
Continuous Improvements at Operator Level

Abstract

Few empirical studies have previously reported on the implementation of takt planning and utilizing Deming cycles (PDCA) to control construction workflows continuously. This paper presents a case study from the offshore renewable industry, closely related to construction. The paper aims to develop and evaluate a conceptual model combining takt planning and the Deming cycle within the offshore wind construction environment. The conceptual model has through interactions with construction experts been modified for a visual board implementation, covering two alternative processes with a fixed number of technicians per performing team. The knowledge base for the conceptual model is based on Takt planning implementation from the lean construction community and PDCA implementation from the lean production community. The main contribution of this paper is the development and evaluation of the conceptual model combining takt planning and the Deming cycle in a construction environment. This conceptual model has potential implications in the construction and refurbishment industry.

Open access