Joint vs. Separate Crowdsourcing Contests

Author(s):  
Ming Hu ◽  
Lu Wang

In a crowdsourcing contest, innovation is outsourced by a firm to an open crowd that competes in generating innovative solutions. Given that the projects typically consist of multiple attributes, how should the firm optimally design a crowdsourcing contest for such a project? We consider two alternative mechanisms. One is a joint contest, where the best solution is chosen from the joint solutions across attributes submitted by all contestants. The other is multiple separate parallel subcontests, with each dedicated to one attribute of the project. It is intuitive that the separate contest has the advantage of potentially creating a “cooperative” final solution contributed by different contestants. However, somewhat surprisingly, we show that the separate contest may reduce the incentive for the crowd to exert effort, resulting in the joint contest becoming the optimal scheme. The comparison of the expected best performances in the two contests depends on the project’s characteristics. For example, if contestants’ performances have a sufficiently high (respectively, low) level of randomness, the separate (respectively, joint) contest is optimal. If the number of contestants is large (respectively, small) enough, the separate (respectively, joint) contest is optimal. Moreover, we find that when the prize is endogenized, the optimal amount of the prize in the joint contest is no less than that in the separate contest. Finally, we extend the model to account for contestants with heterogeneous types. This paper was accepted by Gad Allon, operations management.

1958 ◽  
Vol 36 (8) ◽  
pp. 833-838 ◽  
Author(s):  
J. D. Wood

The non-protein nitrogenous constituents of muscle of migrating sockeye salmon were investigated. These constituents were found to be the same in both male and female fish and were present in approximately the same amounts in both sexes. The histidine content of the muscle in all fish decreased to one fifth of the original value during the early stages of the migratory journey and remained at the low level thereafter. Some of the other constituents changed to a smaller extent, usually increasing in the later stages of the migration. This was especially noticeable in female fish. However, the increase in the concentration of these constituents in the muscle was due to a decrease in the amount of muscle in the fish rather than to an increase in the amounts of the compounds themselves.


2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Oksana Loginova

Abstract The existing theoretical literature on mass customization maintains that customization reduces product differentiation and intensifies price competition. In contrast, operations management studies argue that customization serves primarily to differentiate a company from its competitors. Interactive involvement of the customer in product design creates an affective relationship with the firm, relaxing price competition. This paper provides a model that incorporates consumer involvement to explain the phenomena described in the operations management literature.Two firms on the Hotelling line compete for a continuum of consumers with heterogeneous brand preferences. An exogenously given fraction of consumers is potentially interested in customization. Consumer benefits from customization are the rewards from a special shopping experience and the value of product customization (a better fitting product); these benefits are higher for consumers located closer to the customizing brand. When a consumer purchases a customized product, he/she incurs waiting costs. Each firm simultaneously decides whether to offer standard products, customized products, or both, and then engage in price competition. I show that customization increases product differentiation, leading to less intense price competition. Depending on the parameter values, in equilibrium either both firms offer customized products, one firm offers customized products and the other standard and customized products, or one firm offers customized products and the other standard products. I perform comparative statics analysis with respect to the fraction of consumers interested in customization, the waiting costs, and the fixed cost of customization.


Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 996
Author(s):  
Muhammad Zaryab Khalid ◽  
Sohail Ahmed ◽  
Ibrahim Al-ashkar ◽  
Ayman EL Sabagh ◽  
Liyun Liu ◽  
...  

Cotton is a major crop of Pakistan, and Bemisia tabaci (Homoptera: Aleyrodidae) is a major pest of cotton. Due to the unwise and indiscriminate use of insecticides, resistance develops more readily in the whitefly. The present study was conducted to evaluate the resistance development in the whitefly against the different insecticides that are still in use. For this purpose, the whitefly population was selected with five concentrations of each insecticide, for five generations. At G1, compared with the laboratory susceptible population, a very low level of resistance was observed against bifenthrin, cypermethrin, acetamiprid, imidacloprid, thiamethoxam, nitenpyram, chlorfenapyr, and buprofezin with a resistance ratio of 3-fold, 2-fold, 1-fold, 4-fold, 3-fold, 3-fold, 3-fold, and 3-fold, respectively. However, the selection for five generations increased the resistance to a very high level against buprofezin (127-fold), and to a high level against imidacloprid (86-fold) compared with the laboratory susceptible population. While, a moderate level of resistance was observed against cypermethrin (34-fold), thiamethoxam (34-fold), nitenpyram (30-fold), chlorfenapyr (29-fold), and acetamiprid (21-fold). On the other hand, the resistance was low against bifenthrin (18-fold) after selection for five generations. A very low level of resistance against the field population of B. tabaci, at G1, showed that these insecticides are still effective, and thus can be used under the field conditions for the management of B. tabaci. However, the proper rotation of insecticides among different groups can help to reduce the development of resistance against insecticides.


2021 ◽  
Author(s):  
Liwei Huo ◽  
Zhaoyong Guan ◽  
Dachao Jin ◽  
Xi Liu ◽  
Xudong Wang ◽  
...  

Abstract Eastern China has a large population with rapid development of the economy, where is the important crop producing region. In this region, the spatial and temporal distribution of autumn rainfall in Eastern China is uneven, which has important societal impact. Using the NCEP–NCAR reanalysis and other observational datasets, it is found that the spatial distribution of the first EOF mode of autumn rainfall anomalies in eastern China is consistent across the region, with significant interannual variabilities. Pronounced interdecadal variations are presented in the relationship between autumn rainfall anomalies in eastern China and sea-surface temperature anomalies (SSTA) over the southeastern tropical Indian Ocean (SETIO). The interdecadal changes have been analyzed by considering two epochs: one during 1979-2004 and the other during 2005-2019. It shows weak and insignificant correlations between the autumn rainfall anomalies in eastern China and SSTA over SETIO during the first epoch. On the other hand, they are remarkable and positively correlated with each other during the second epoch. The inter-decadal changes of the above relationship are related to the warming of SST over SETIO during the second epoch. It causes stronger low-level convergence and ascending motion over SETIO, with the co-occurrence of enhanced western Pacific subtropical high and anomalous abundant moisture over eastern China carried by a low-level southerly anomaly originating from the South China Sea. Simultaneously, the local Hadley circulation over eastern China becomes weak, corresponding to the anomalous ascending motion. The collaboration of anomalous water vapour transport and ascending motion strengthens the connection between the SETIO SSTA and the autumn precipitation anomalies in eastern China, and vice versa. In the boreal autumn of 2019, entire eastern China suffered extreme drought. It suggests that this drought event in eastern China is strongly affected by the negative SSTA over SETIO, which is consistent with the statistical results.


2018 ◽  
Vol 10 (3) ◽  
pp. 252-260
Author(s):  
Soheil Mahmoudi

This study tried to find the possible relationship between listeners' cultural schemata and its activation and their performance in EFL listening comprehension. The participants of this study were two groups of 37 Muslim Iranian students. Firstly, the students were divided into two groups of high and low proficiency. Then, they were exposed to two audio files, one about mosques and the other about cathedrals. In one of the classes the recording about the cathedrals was played first, but in the other the order was reversed. The collected data were inputted into the SPSS program. The null hypothesis of the study was whether listening to a culturally unfamiliar topic (cathedrals) can activate low-level learners’ schema of the culturally familiar topic (mosques). The hypothesis of the study was accepted implying that an unfamiliar text, even if it is conceptually similar, cannot activate a culturally familiar schema in the low-level students. This study has pedagogical implications for teaching listening comprehension.


2021 ◽  
Vol 2 (1) ◽  
pp. 91-96
Author(s):  
Olena Taranukha

The digital economy allows to compose the new business models, digital platforms and services, which create new types of economic activity, as well as the transformation of traditional industries. Due to the industries transformation to the digital economy there is the transformation of the world economy, or rather the economy itself is being digitized The purpose of the paper is to reveal the essence and features of the digital economy formation and to consider what significant transformations will take place in the world by the analysis of major trends in the near future. Accumulating all the concepts, we can say that the digital economy is the rather complex term, but we can assume that its development is based on the key components According to forecast estimates, the most advanced retail companies will begin implementing the service of virtual and voice search of goods by 2022. This will require from the company the better understanding of the consumers wishes, their interests and intentions. Consider the main technological development trends for 2020-2025 based on the data of the major consulting agencies and the consulting company "Cartner" Figure 2 shows the forecast curve of the new technologies development. Innovative development triggers that will actively influence the technology development include the following: the Authenticated Provenance, Low-Cost Single Board Computers at the Edge, Self-Supervised Learning, BMI (Brain Machine Interface), active development of "Packaged Business Capabilities" services, Digital Twin of the Person and Composible Enterprises. The peak of disappointments will be Social Distancing Technologies and Secure Access Service. The source of expectations will be the development of Carbon-Based transistors technology and Human digital Ontologies. The formation of a productivity platform will be based on trends in Self-Development and Self-Education. Digital IT trends grow, evolve and acquire new properties of social technologies that can influence the structure of the community, form dependencies and demand. Therefore, companies, large corporations and government need to move to more flexible composite business architectures. The modular business model is based on four basic principles: modularity, efficiency, continuous improvement and adaptive innovation. This business model allows to move from rigid traditional planning to a flexible response to rapidly changing business needs. In general, it creates opportunities for innovative approaches, reduces costs and improves partnerships. It is important to pay attention to the other technologies in the new business model such as bundled business services, data factories, private 5G networks and embedded artificial intelligence. Thus, as a result of the research it is proved that the digital world is a completely new order of life, which requires to change our thinking. The person should be always focused on the new technologies and methods in order the enterprises remain competitive and constantly developed, it will promote the economy development and the growth of well-being of the society. So, taking into account the global trends in technology development, Ukraine has to adapt to the new standards quickly and implement innovative solutions for the economic development. The digitalization of the economy, on the one hand, is the key to economic success, on the other hand, it is the driving force in the conditions of the conceptual understanding of the digital economy essence. The growth of the quality and innovation level of domestic goods and services should provide not only sustainable economic growth, but also competitive advantages with further integration into the EU. At the same time, there is the relevant need of the scientific and technological research, the formation of a certain business ("digital") culture, the implementation of smart city ideas in Ukraine based on the development of local communities and the emergence of new initiatives and proposals for innovative solutions.


Author(s):  
Fumie Costen ◽  
Akos Balasko

The computational architecture of Enabling Grids for E-sciencE is introduced as it made our code porting very challenging, and the discussion presented is directly applicable to EGEE users. The final solution to the code poring problem is proposed, and its performance is examined. The solution to this problem be generally faced in the other large scale computation and so is applicable to users of other HPC facilities. This chapter gives a hint to those who have difficulties in applications with heavy data Input/Output (I/O) under the computational environment whose weak point is the data I/O.


2021 ◽  
pp. 158-184
Author(s):  
Elliott Young

Machado was just five years old in 1990 when she was brought to the United States by her mother, who was desperate to escape the civil war raging in their home country of El Salvador; she wanted a better life for her two young daughters. In 2015, she was picked up in a traffic stop in Arkansas which triggered her deportation based on a felony conviction from a decade earlier. Machado’s story reveals a radical shift that had been happening since the mid-1990s. Unprecedented numbers of immigrants were being caught in a system that penalized people with mandatory deportations for relatively low-level crimes. Machado does not fit easily into the Manichean distinction made by President Obama in 2014 between “felons” on the one hand and “families” on the other. Machado, like so many others, is both.


2018 ◽  
Vol 8 (4) ◽  
pp. 242
Author(s):  
Suchandra Paul

The organizational project management control has been the area of great interest from long time among the investigators who validated that there is a great necessity of control approaches in an organization to acquire their goals. In this paper, a detailed analysis describing the stages associated with control in project management process has been illustrated. In the first phase the proposed plans are outlined with a follow up on the deviation of the plans with causes. In the final phase a detailed solution analysis was carried on what the company did to fix the series of delays along with some suggestions stating proper ways of dealing the situations. This research gives a wide overview on the problems that 787 Dreamliner faced during its manufacturing and delivery process. The analysis was done on the control perspective. Innovative solutions was laid down which if applied during the service procedures could have avoided the problems related to delay of 787 Dreamliner’s delivery. The main intention of this research is that the solutions and strategies provided can be implemented successfully to the other organization for better planning and handling of entire process ultimately minimizing the downtime and increasing the productivity of the organization.


Author(s):  
Emre Yildirim

The main purposes of this research are (1) to reveal the virtual credit card (VCC) awareness of online shoppers and (2) to prepare a to do list for managers and relevant institutions to provide a more secured internet shopping process by enhancing the trust perception of consumers. To this end, a structured questionnaire consists of three sections was designed and conducted during the period April-May 2018 in Turkey. The findings achieved show that online shoppers mostly attach importance to the recognition of the website, which means they seek trust in online shopping process. On the other hand, they mostly use credit and debit cards, which may make consumers encounter serious fraud issues. VCC usage is only 4.9% in general although VCC awareness is 55.1%. This low level of VCC awareness is associated with education level and the information provided by the financial banks.


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