Byung-Hyun Shin, Dohyung Kim, Sanghyup Park, Myungwon Hwang, Junghyun Park and Wonsub Chung
The secondary phase decreased the corrosion resistance because of the segregation of Cr and Mo. Therefore, this paper aims to study the precipitation condition and the effect of…
Abstract
Purpose
The secondary phase decreased the corrosion resistance because of the segregation of Cr and Mo. Therefore, this paper aims to study the precipitation condition and the effect of secondary phase with volume fraction on corrosion behavior.
Design/methodology/approach
Secondary phase precipitated approximately from 375°C to 975°C because of saturated Cr and Mo at grain boundary by growth of austenite. Therefore, heat treatment from 800°C to 1,300°C was applied to start the precipitation of the secondary phase.
Findings
The secondary phase is precipitated at 1,020°C because of segregation by heterogeneous austenite. The growth of austenite at 1,000°C needs the time to saturate the Cr and Mo at grain boundary. When the volume fraction of austenite is 56 per cent (14 min at 1,000°C), the secondary phase is precipitated with grain boundary of austenite. The secondary phase increased the current density (corrosion rate) and decreased the passivation. That is checked to the critical pitting temperature (CPT) curves. The 1 per cent volume fraction of secondary phase decreased CPT to 60°C from 71°C.
Research limitations/implications
The precipitation of secondary phase not wants anyone. Casted super-duplex stainless steel (SDSS) of big size precipitates the secondary phase. This study worked the precipitation condition and the suppression conditions of secondary phase.
Social implications
Manufacturers need precipitation condition to make high-performance SDSS.
Originality/value
The corrosion resistance of SDSS is hard the optimization because SDSS is dual-phase stainless steel. The precipitation of the secondary phase must be controlled to optimize of the corrosion resistance of SDSS. Anyone not studied the precipitation condition of secondary phase and the effect of secondary phase with volume fraction on corrosion behavior of SDSS.
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Byung-Hyun Shin, Junghyun Park, Jongbae Jeon, Sung-bo Heo and Wonsub Chung
In this study, super duplex stainless steel (SDSS) was heat-treated. The purpose of this study is to assess the effect of the cooling rate after heat treatment on the pitting…
Abstract
Purpose
In this study, super duplex stainless steel (SDSS) was heat-treated. The purpose of this study is to assess the effect of the cooling rate after heat treatment on the pitting corrosion of SDSS.
Design/methodology/approach
The heat treatment from 1,000°C to 1,300°C was applied to SDSS to check the effect of the cooling rate.
Findings
The heat treatment temperature produced a different SDSS microstructure, and the cooling rate led to the growth of austenite. The casted SDSS indicated the presence of heterogeneous austenite, and the precipitation secondary phase under 1.6 per cent precipitated to bare metal. By applying heat treatment and cooling SDSS, its corrosion resistance changes because of the change in the chemical composition. The cooling rate at 5,600 J/s has the highest critical pitting temperature (CPT) at 1,100°C, and the cooling rate at 1.6 J/s has the highest CPT at 1,200°C. Low cooling rate (0.4 J/s) made the secondary phase at all temperature range.
Research limitations/implications
The effect of secondary phase not consider because that is well known to decreasing corrosion resistance.
Practical implications
Solution annealing is taken into account to optimize the corrosion resistance. But that is not consider the cooling rate at each temperature. This study assessed the effect of the cooling rate at each temperature point.
Social implications
Manufacturers need to know the effect of the cooling rate to optimize the corrosion resistance, and this study can be applied in the industrial scene.
Originality/value
SDSS is hard the optimization because SDSS is a dual-phase stainless steel. Corrosion resistance can be optimized by controlling heat treatment temperature and the cooling rate. Anyone not studied the effect of the cooling rate at each temperature. The effect of the cooling rate should be considered to optimize the corrosion resistance.
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Xiuzhi Zhang, Zhijie Lin and Junghyun Maeng
The sharing economy has enjoyed rapid growth in recent years, and entered many traditional industries such as accommodation, transportation and lending. Although researchers in…
Abstract
Purpose
The sharing economy has enjoyed rapid growth in recent years, and entered many traditional industries such as accommodation, transportation and lending. Although researchers in information systems and marketing have attempted to examine the impacts of the sharing economy on traditional businesses, they have not yet studied the rental housing market. Thus, this research aims to investigate the impact of the sharing economy (i.e. home-sharing) on traditional businesses (i.e. rental housing market).
Design/methodology/approach
The authors assemble rich data from multiple sources about the entry of a leading Chinese home-sharing platform (i.e. Xiaozhu.com) and local housing rental price index. Then, econometric models (i.e. linear panel-level data models) are employed for empirical investigation. Instrumental variables are used to account for potential endogeneity issues. Various robustness checks are adopted to establish the consistency of the findings.
Findings
Overall, the estimation results show that the entry of a home-sharing platform will decrease the local housing rental price. Moreover, this impact would be strengthened in a more developed city. Additionally, this impact would be strengthened with higher prices of new houses or second-hand houses.
Originality/value
First, this research is one of the first to study the impact of the sharing economy (i.e. home-sharing) on traditional markets (i.e. housing rentals). Second, it contributes to the relevant literature by documenting that the impact of a platform's entry is not uniform but contingent on city and housing market characteristics. Third, practically, the findings also offer important implications for platform operators and policy makers.
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Myung Suh Lim and Junghyun Kim
The purpose of this paper is to investigate: first, the effects of a user’s grandiosity on the loneliness of another user on Facebook who detected it in terms of his/her…
Abstract
Purpose
The purpose of this paper is to investigate: first, the effects of a user’s grandiosity on the loneliness of another user on Facebook who detected it in terms of his/her well-being status; second, the mediational role of envy between grandiosity and loneliness; and, third, whether different effects are given on narcissism, envy, and loneliness depending on social or para-social relationships on Facebook.
Design/methodology/approach
This study’s focus is to investigate how observing others’ grandiose behaviors impact on individuals’ feeling of loneliness. The authors propose that this relationship is mediated by the feeling of envy. The authors further postulate that social relationships that participants may have with other Facebook users would play a key role in feeling different types of envy (i.e. malicious vs benign). Therefore, the current study employed a 2 (levels of grandiosity: high vs low) × 2 (social relationship: para-social vs social) between-subjects design.
Findings
The authors found that one’s grandiosity as reflected on Facebook significantly affects other users’ loneliness through malicious envy. However, no moderated mediation via envy (either benign or malicious) was found within the social relationship group.
Originality/value
Social comparison generated by the use of Facebook was found to have an effect on the user’s loneliness through the mediation of envy. In particular, the possibility that such effects could be triggered in para-social relationships was identified.
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Alisher Tohirovich Dedahanov, Do Hyung Lee, Jaehoon Rhee and Junghyun Yoon
Despite the number of studies on employee voice much remains unknown regarding the mediating role of employee voice in the link between entrepreneur’s paternalistic leadership…
Abstract
Purpose
Despite the number of studies on employee voice much remains unknown regarding the mediating role of employee voice in the link between entrepreneur’s paternalistic leadership style and creativity. Therefore, the purpose of this paper is to examine the influence of authoritarian, benevolent and moral leadership on creativity via employee voice.
Design/methodology/approach
The study utilized structured equation modeling to evaluate the data from 387 highly skilled employees in Republic of Korea.
Findings
The findings suggested that authoritarian leadership style reduces employee voice which in turn impacts on creativity and moral leadership facilitates creativity via employee voice.
Originality/value
The study is the first to discover the mediating role of employee voice on the association between authoritarian, moral leadership and creativity.
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Junghyun (Jessie) Lee, Anjali Chaudhry and Amanuel G. Tekleab
–The purpose of this paper is to investigate the inter-relationships among the closely related exchange-based constructs such as psychological contract (PC) breach, perceived…
Abstract
Purpose
–The purpose of this paper is to investigate the inter-relationships among the closely related exchange-based constructs such as psychological contract (PC) breach, perceived organisational support (POS), and exchange ideology. The authors examine the effects of three-way interaction of them on employee performance.
Design/methodology/approach
This study theoretically builds on a personality trait-based interactionist model of performance (Tett and Burnett, 2003) and empirically tests the model using multi-source data collected from employee-manager dyads in a non-profit organisation. Hierarchical linear modelling was employed for analysis.
Findings
The results indicate a significant three-way interaction, such that, the negative relationship between PC breach and task performance is the strongest when employees with a high exchange ideology perceive low levels of POS.
Practical implications
These findings suggest that organisations should ensure employees feel supported and pay special attention to employees with a high exchange ideology to minimise the harmful consequences of PC breach
Originality/value
The study provides new theoretical insights to PC literature by integrating the interactionist approach, cognitive psychology, and exchange ideology research. It highlights the importance of simultaneously examining both a situational and an individual variable in predicting employee performance after PC breach
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The purpose of this paper is to examine whether observed hostility mediates the link between passive leadership and sexual harassment. The study also investigates how workplace…
Abstract
Purpose
The purpose of this paper is to examine whether observed hostility mediates the link between passive leadership and sexual harassment. The study also investigates how workplace gender ratio might moderate this mediated relationship.
Design/methodology/approach
This study used online survey data by recruiting full-time working employees in various US organisations and industries.
Findings
Results suggest that when working under a passive leader, both men and women are more likely to experience sexual harassment. Furthermore, the positive association between hostility and sexual harassment is stronger for female employees who work in a male-dominated organisation (low gender ratio). However, the moderating effects of workplace gender ratio were not significant for male employees.
Practical implications
Organisations seeking to reduce or prevent sexual harassment should monitor and screen out managers who display passive leadership behaviour and create a work environment where collegial and civil interactions are encouraged and valued.
Originality/value
This research advances our knowledge regarding the organisational factors of sexual harassment by examining passive leadership, hostile work context, and workplace gender ratio. Theoretically, the study contributes to the sexual harassment literature by incorporating evidence on passive leadership from a broader field of workplace aggression into sexual harassment research. Practically, the study offers important implications for organisations that seek to minimise sexual harassment.
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Ana Brochado, Pedro Dionísio and Maria Carmo Leal
A key concern in sports sponsorship decisions is knowing under what conditions sponsorship can effectively act as a brand building tool. The purpose of this study is to list…
Abstract
Purpose
A key concern in sports sponsorship decisions is knowing under what conditions sponsorship can effectively act as a brand building tool. The purpose of this study is to list attributes to use when examining congruency in the sponsorship of national football teams. The second aim was to test whether being a client of the sponsor brand and being involved with the sponsee moderates the relationship between image congruence and sponsorship response.
Design/methodology/approach
Data were collected on four sponsors of the Portuguese national team, just before the 20th Fédération Internationale de Football Association World Cup. Analyses were conducted on a representative national sample of fans. The research design encompassed a two-step approach. First, qualitative analysis identified the main attributes that fans associate with the national team. In the second quantitative phase, moderated regression analysis was used to test the proposed model.
Findings
This study confirmed sponsor–sponsee congruence in seven attributes (i.e. national symbol, strength, strong emotions, happiness, optimism, connection and positive feelings) enhances positive brand image and fans’ involvement with the national team moderates this relationship. Positive sponsorship outcomes tend to be higher for sponsors when fans are currently clients of the sponsor brand.
Originality/value
This study adds to previous research by using mixed methods to study sponsor–sponsee congruence regarding national teams and by testing whether fans being clients of sponsors and being involved with sponsees moderate sponsor–sponsee congruence.
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Zhe Wang, Xisheng Li, Xiaojuan Zhang, Yanru Bai and Chengcai Zheng
How to model blind image deblurring that arises when a camera undergoes ego-motion while observing a static and close scene. In particular, this paper aims to detail how the…
Abstract
Purpose
How to model blind image deblurring that arises when a camera undergoes ego-motion while observing a static and close scene. In particular, this paper aims to detail how the blurry image can be restored under a sequence of the linear model of the point spread function (PSF) that are derived from the 6-degree of freedom (DOF) camera’s accurate path during the long exposure time.
Design/methodology/approach
There are two existing techniques, namely, an estimation of the PSF and a blind image deconvolution. Based on online and short-period inertial measurement unit (IMU) self-calibration, this motion path has discretized a sequence of the uniform speed of 3-DOF rectilinear motion, which unites with a 3-DOF rotational motion to form a discrete 6-DOF camera’s path. These PSFs are evaluated through the discrete path, then combine with a blurry image to restoration through deconvolution.
Findings
This paper describes to build a hardware attachment, which is composed of a consumer camera, an inexpensive IMU and a 3-DOF motion mechanism to the best of the knowledge, together with experimental results demonstrating its overall effectiveness.
Originality/value
First, the paper proposes that a high-precision 6-DOF motion platform periodically adjusts the speed of a three-axis rotational motion and a three-axis rectilinear motion in a short time to compensate the bias of the gyroscope and the accelerometer. Second, this paper establishes a model of 6-DOF motion and emphasizes on rotational motion, translational motion and scene depth motion. Third, this paper addresses a novel model of the discrete path that the motion during long exposure time is discretized at a uniform speed, then to estimate a sequence of PSFs.