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Article

Peng Du, Haibao Hu, Feng Ren and Dong Song

The maintenance of the air–water interface is crucial for the drag reduction on hydrophobic surfaces. But the air bubbles become unstable and even washed away under high…

Abstract

Purpose

The maintenance of the air–water interface is crucial for the drag reduction on hydrophobic surfaces. But the air bubbles become unstable and even washed away under high speed flow, causing the failure of surface hydrophobicity. Thereby, this paper aims to understand the relations between bubble behaviors and surface properties, flow conditions and to discover new methods to maintain the air–water interface.

Design/methodology/approach

Bubble properties on hydrophobic surfaces were characterized using single-component multiphase lattice Boltzmann simulation. Three equations of state (EOSs), including the Peng–Robinson, Carnahan–Starling and modified Kaplun–Meshalkin EOSs, were incorporated to achieve high density ratios.

Findings

Both the static and dynamic properties of bubbles on hydrophobic surfaces were investigated and analyzed under different flow conditions, solid–liquid interactions and surface topology.

Originality/value

By revealing the properties of bubbles on hydrophobic surfaces, the effects of flow conditions and surface properties were characterized. The maintenance method of air–water interface can be proposed according to the bubble properties in the study.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 6
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Peng Du and Hsin-Hui Chou

The purpose of this paper is to address the research question of how human actors and technology interact together in practices in the context of a sharing economy. The…

Abstract

Purpose

The purpose of this paper is to address the research question of how human actors and technology interact together in practices in the context of a sharing economy. The theoretical foundation of this paper is based on the existing literature about the sharing economy and studies that have been carried out examining value co-creation and sociomateriality.

Design/methodology/approach

This paper adopts a qualitative case study method for the empirical investigation. Using theoretical sampling, Xbed, an internet, unmanned and self-service hotel platform based in Guangzhou, China, was chosen for the empirical investigation. The case was built on multiple sources of data, including archival materials, on-site fieldwork and in-depth interviews. Then, the case was interpreted based on a number of theoretical concepts, with a particular emphasis on the sociomaterial perspective.

Findings

This paper shows how human actors and technology interact with one another in a number of interrelated ways, which collectively result in the value co-creation necessary for creating a sharing economy. The authors have found that various forms of sociomateriality (the intersection between technology, work and organization) play a key role in co-creation and that interactions between these sociomaterial assemblages (assemblage-to-assemblage (A2A)) drive the development of a sharing economy. These sociomaterial assemblages have dynamic and evolving characteristics.

Practical implications

The authors argue that the key to the success of a sharing economy lies in how to engage participating actors with material entities (e.g. technology applications) to form action-enabling sociomaterial assemblages, as well as in determining how these assemblages can be systematically arranged to collectively form a larger assemblage. We suggest that managers need to conceive how relations between the social and the material realms can be structured by adopting a service logic that aims to help the beneficiary function better. The authors also suggest that managers have to consider what assemblages are necessary and how they are connected, to construct a full access-based service.

Originality/value

This paper conceptualizes the sharing economy as a system of value co-creation practices and empirically examines such practices from a sociomaterial perspective. This paper adopts the concept of sociomaterial assemblages to investigate sharing practices, through which the knowledge of the role of technology in the development of a sharing economy is enhanced. This paper also expands the knowledge of service-dominant logic by using a microfoundation perspective to look at the value co-creation that emerges as a result of the interaction between sociomaterial assemblages. These assemblages also act as constitutive elements of a service ecosystem.

Details

Information Technology & People, vol. 33 no. 3
Type: Research Article
ISSN: 0959-3845

Keywords

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Article

Yaxin Peng, Naiwu Wen, Chaomin Shen, Xiaohuang Zhu and Shihui Ying

Partial alignment for 3 D point sets is a challenging problem for laser calibration and robot calibration due to the unbalance of data sets, especially when the overlap of…

Abstract

Purpose

Partial alignment for 3 D point sets is a challenging problem for laser calibration and robot calibration due to the unbalance of data sets, especially when the overlap of data sets is low. Geometric features can promote the accuracy of alignment. However, the corresponding feature extraction methods are time consuming. The purpose of this paper is to find a framework for partial alignment by an adaptive trimmed strategy.

Design/methodology/approach

First, the authors propose an adaptive trimmed strategy based on point feature histograms (PFH) coding. Second, they obtain an initial transformation based on this partition, which improves the accuracy of the normal direction weighted trimmed iterative closest point (ICP) method. Third, they conduct a series of GPU parallel implementations for time efficiency.

Findings

The initial partition based on PFH feature improves the accuracy of the partial registration significantly. Moreover, the parallel GPU algorithms accelerate the alignment process.

Research limitations/implications

This study is applicable to rigid transformation so far. It could be extended to non-rigid transformation.

Practical implications

In practice, point set alignment for calibration is a technique widely used in the fields of aircraft assembly, industry examination, simultaneous localization and mapping and surgery navigation.

Social implications

Point set calibration is a building block in the field of intelligent manufacturing.

Originality/value

The contributions are as follows: first, the authors introduce a novel coarse alignment as an initial calibration by PFH descriptor similarity, which can be viewed as a coarse trimmed process by partitioning the data to the almost overlap part and the rest part; second, they reduce the computation time by GPU parallel coding during the acquisition of feature descriptor; finally, they use the weighted trimmed ICP method to refine the transformation.

Details

Assembly Automation, vol. 40 no. 2
Type: Research Article
ISSN: 0144-5154

Keywords

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Article

Wanbin Pan, Yigang Wang and Peng Du

The purpose of this paper is to develop an automatic disassembly navigation approach for human interactions in the virtual environment to achieve accurate and effective…

Abstract

Purpose

The purpose of this paper is to develop an automatic disassembly navigation approach for human interactions in the virtual environment to achieve accurate and effective virtual assembly path planning (VAPP).

Design/methodology/approach

First, to avoid the error-prone human interactions, a constraint-based disassembly method is presented. Second, to automatically provide the next operable part(s), a disassembly navigation mechanism is adopted. Finally, the accurate assembly path planning can be obtained effectively and automatically by inversing the ordered accurate disassembly paths, which are obtained interactively in the virtual environment aided with the disassembly navigation matrix.

Findings

The applications present that our approach can effectively avoid the error-prone interactive results and generate accurate and effective VAPP.

Research limitations/implications

There are several works that could be conducted to make our approach more general in the future: to further study the basic disassembly direction deducing rules to make the process of determining disassembly direction totally automatic, to consider the hierarchy of the parts in virtual reality system and to consider the space for assembly/disassembly tools or operators.

Originality/value

The approach has the following characteristics: a new approach to avoid the error-prone human interactions for accurate assembly path planning obtaining, a new constraint deducing method for determining the disassembly semantics automatically or semi-automatically is put forward and a new method for automatically identifying operable parts in VAPP is set forward.

Details

Assembly Automation, vol. 34 no. 3
Type: Research Article
ISSN: 0144-5154

Keywords

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Article

Peng Du, Jun Wang, Weijia Jia, Liusheng Huang and Huan Li

Time slot allocation in world interoperability for microwave access (WiMax) mesh networks is controlled by a centralized scheduling algorithm, as specified in the IEEE…

Abstract

Purpose

Time slot allocation in world interoperability for microwave access (WiMax) mesh networks is controlled by a centralized scheduling algorithm, as specified in the IEEE standard 802.16. The scheduling algorithm should be able to minimize the total transmission time for all traffic flows. The purpose of this paper is to investigate the multi‐channel scheduling problem in WiMax mesh networks, in order to explore the potential of simultaneous transmissions and thus minimize the total transmission time.

Design/methodology/approach

The paper first analyzes how many channels are sufficient for the avoidance of interference, then presents an efficient scheduling algorithm along with the channel assignment strategy for time slot allocation. Particularly, for networks with chain topology, the paper provides an optimal solution to minimize the total transmission time.

Findings

The simulation results show that this scheme can improve the system performance substantially as compared with the single‐channel system. Also, it is observed that double‐channel settings may provide a performance similar to the multiple channels.

Practical implications

The algorithm presented in this paper is conformed to the IEEE standard 802.16‐2004; so it is suitable for WiMax mesh networks.

Originality/value

The paper is of value in presenting a scheduling and channel assignment schema for multi‐channel WiMax mesh networks. The work is also important for the study of time division multiple access (TDMA)‐based multi‐channel wireless mesh networks.

Details

International Journal of Pervasive Computing and Communications, vol. 5 no. 3
Type: Research Article
ISSN: 1742-7371

Keywords

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Article

Jiazhen Liu and Peng Du

The purpose of this paper to describe the research work on the long‐term preservation of Chinese digital information funded by National Natural Science Foundation of China…

Abstract

Purpose

The purpose of this paper to describe the research work on the long‐term preservation of Chinese digital information funded by National Natural Science Foundation of China (NSFC) since 2001.

Design/methodology/approach

The paper provides an overview, in text and figures, of ways in which e‐documents originating in China, in now obsolete formats, can be made readable again. Also, results of a recent survey of electronic records management in government and corporations are given.

Findings

The lifecycle management gap with respect to electronic records is highlighted and the main factors that restrict the Chinese anti‐disaster data backup plan are analysed. It is suggested that the data backup centre which can be accepted by small medium enterprises should be the e‐government disaster recovery centre for local government.

Originality/value

All the research results are useful for those who need to understand the long‐term preservation of Chinese digital information and electronic records management.

Details

Program, vol. 43 no. 2
Type: Research Article
ISSN: 0033-0337

Keywords

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Article

Guijiang Duan, Zhibang Shen and Rui Liu

This paper aims to promote the integration of the relative position accuracy (RPA) measurement and evaluation in digital assembly process by adopting the model-based…

Abstract

Purpose

This paper aims to promote the integration of the relative position accuracy (RPA) measurement and evaluation in digital assembly process by adopting the model-based method. An integrated framework for RPA measurement is proposed based on a model-based definition (MBD) data set. The study also aims to promote the efficiency of inspection planning of RPA measurement by improving the reusability and configurability of the inspection planning.

Design/methodology/approach

The works have been carried out on three layers. In the data layer, an extended MBD data set is constructed to describe the objects and data for defining RPA measurement items; In definition layer, a model based and hierarchical structure for RPA item definition is constructed to support quick definition for RPA measurement items. In function layer, a toolset consisting three modules is constructed in a sequence from measurement planning to RPA value solving to visualized displaying again. Based on this framework, a prototype system is developed.

Findings

The paper provides an identified practice of model-based inspection. It suggests that MBD is valuable in promoting both the integration and efficiency of digital inspection.

Research limitations/implications

The templates and constructed geometry objects given in this paper are still limited in a scenario of aircraft assembly. The integrity and universality of them still need follow-up works.

Practical implications

The paper includes implications for the model based digital inspection, the digital assembly and the extended application of MBD.

Originality/value

This paper expands the application of MBD in inspection and fulfils the need to promote the integration and efficiency of digital inspection in large-scale component assembly.

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Article

Hui-Wen Deng and Kwok Wah Cheung

The National People’s Congress (NPC) of People’s Republic of China, the highest organ of state power, is popularly seen as a rubber-stamp entity. However, it has been…

Abstract

Purpose

The National People’s Congress (NPC) of People’s Republic of China, the highest organ of state power, is popularly seen as a rubber-stamp entity. However, it has been substantially evolving its roles to accommodate the governance discourses within China’s political system over the decades. This study aims to explore the changes of governance discourse of the NPC within China’s political system through which to offer a thorough understanding of the NPC’s evolving substantial role in current China.

Design/methodology/approach

This study deploys a historical approach to explore the changes of governance discourse of the NPC that has seen a growing importance in China’s political agenda, as argued by this study.

Findings

The authors find that the NPC has been substantially evolving its role within China’s political system in which the Chinese Communist Party has created different governance discourses. Besides, the NPC and its Standing Committee have asserted its authority as a substantial actor within China’s political system. The NPC is no longer functioned as a rubber-stamp institution, though it is still popularized as a rubber stamp by many scholars.

Research limitations/implications

This study is a historical elaboration on the development of NPC under three governance discourses. It might be, to some extent, relatively descriptive in nature.

Originality/value

This study, therefore, sheds some light on a revisit on the governance discourses in current China.

Content available

Abstract

Details

International Journal of Pervasive Computing and Communications, vol. 5 no. 3
Type: Research Article
ISSN: 1742-7371

Content available
Article

Yishou Wang, Zhibin Han, Tian Gao and Xinlin Qing

The purpose of this study is to develop a cylindrical capacitive sensor that has the advantages of high resolution, small size and designability and can be easily…

Abstract

Purpose

The purpose of this study is to develop a cylindrical capacitive sensor that has the advantages of high resolution, small size and designability and can be easily installed on lubricant pipeline to monitor lubricant oil debris.

Design/methodology/approach

A theoretical model of the cylindrical capacitive sensor is presented to analyze several parameters’ effectiveness on the performance of sensor. Numerical simulations are then conducted to determine the optimal parameters for preliminary experiments. Experiments are finally carried out to demonstrate the detectability of developed capacitive sensors.

Findings

It is clear from experimental results that the developed capacitive sensor can monitor the debris in lubricant oil well, and the capacitance values increase almost linearly when the number and size of debris increase.

Research limitations/implications

There is lot of further work to do to apply the presented method into the application. Especially, it is necessary to consider several factors’ influence on monitoring results. These factors include the flow rate of the lubricant oil, the temperature, the debris distribution and the vibration. Moreover, future work should consider the influence of the oil degradation to the capacitance change and other contaminations (e.g. water and dust).

Practical implications

This work conducts a feasibility study on application of capacitive sensing principle for detecting debris in aero engine lubricant oil.

Originality/value

The novelty of the presented capacitance sensor can be summarized into two aspects. One is that the sensor structure is simple and characterized by two coaxial cylinders as electrodes, while conventional capacitive sensors are composed of two parallel plates as electrodes. The other is that sensing mechanism and physical model of the presented sensor is verified and validated by the simulation and experiment.

Details

Industrial Lubrication and Tribology, vol. 70 no. 7
Type: Research Article
ISSN: 0036-8792

Keywords

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