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Tang, Ou
Publications (10 of 68) Show all publications
wang, D., Tang, O. & Zhang, L. (2015). A note on the rationing policies of multiple demand classes with lost sales. International Journal of Production Economics, 165, 145-154
Open this publication in new window or tab >>A note on the rationing policies of multiple demand classes with lost sales
2015 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 165, p. 145-154Article in journal (Refereed) Published
Abstract [en]

We study inventory rationing in a system with multiple demand classes and lost sales. It is assumed to have at most one outstanding order, resulting in two periods in an order cycle separated by the time of order release. We review the most related work by Melchiors (2001, PhD Thesis, University of Aarhus; 2003, International Journal of Production Economics 81-82, 461-468), and find that the existing approximated and optimal policies are not easy to obtain due to computational complexity. Also as the rationing issue before order release is not well addressed in literature, in this paper we have proved the static rationing being optimal. Furthermore in such a system with two distinct periods, the optimal rationing policy is a combination of a dynamic policy during the replenishment lead time and a static policy before order release. In order to make the rationing policies to be readily used in practice, we introduce two approximated methods for calculating the rationing levels in two periods, respectively. The results, in particular the combination of static and dynamic rationing, outperform the existing approximations in literature. In addition, the computation is obviously simplified due to the efficient algorithm of dynamic rationing and the explicit expressions of static rationing.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
inventory rationing, multiple demand classes, lost sales
National Category
Economics
Identifiers
urn:nbn:se:liu:diva-117441 (URN)10.1016/j.ijpe.2015.03.029 (DOI)000356110400014 ()
Available from: 2015-04-27 Created: 2015-04-27 Last updated: 2017-12-04
Chen, L., Feldmann, A. & Tang, O. (2015). An empirical evaluation of sustainable operations practices and performance in the Swedish manufacturing industry.
Open this publication in new window or tab >>An empirical evaluation of sustainable operations practices and performance in the Swedish manufacturing industry
2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

This study explored whether there are patterns linking sustainability practices and performance in the Swedish manufacturing industry. Meanwhile, the relationships between sustainability improvement practices and companies’ triple bottom line performance were investigated using survey data from Swedish manufacturing companies. Treating each sustainability practice and performance indicator as an individual item, factor analysis and cluster analysis were conducted to explore the potential patterns and relationships. The results indicated that the triple bottom line provides a valid outline for representing companies’ sustainability practices in the Swedish manufacturing industry. In terms of sustainability performance, the results showed that economic performance was often treated as a separate category in practice, whereas environmental sustainability and social sustainability were often combined. Process and product technology level was positively correlated with environmental performance and innovation performance. Economic, social, and environmental practices had positive correlations with performance in the respective area. Even though not all social and environmental practices directly improved companies’ economic performance, some social and environmental practices, such as education, individual development, and environmental health improvement, had an indirect effect and, thus, are deserving of specific attention. These selected practices often had a positive impact on product and process innovation, which could further improve companies’ economic performance.

Keywords
Sustainability, operations strategies, operations performance, survey
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:liu:diva-121050 (URN)
Available from: 2015-09-03 Created: 2015-09-03 Last updated: 2015-09-03Bibliographically approved
Chen, L., Tang, O. & Feldmann, A. (2015). Applying GRI reports for the investigation of environmental management practices and company performance in Sweden, China and India. Journal of Cleaner Production, 98, 36-46
Open this publication in new window or tab >>Applying GRI reports for the investigation of environmental management practices and company performance in Sweden, China and India
2015 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 98, p. 36-46Article in journal (Refereed) Published
Abstract [en]

The relationship between environmental management practices (EMPs) and company performance hasrecently been debated in literature and is of interest for both industrial managers and political decisionmakers.This paper investigates the relationship between EMPs and firm performance in manufacturingcompanies in Sweden, China and India. With the content analysis of Global Reporting Initiative (GRI)reports and financial reports of sample companies, the levels of EMPs and the companies’ financialperformances were coded. Further statistical assessment was conducted in order to identify patterns andcorrelations. The results indicate that only selected EMPs have been employed differently in threedifferent countries. Most EMPs clearly do not have a positive correlation with the financial performance;i.e. employing EMPs does not necessarily improve the economic consequence of companies. Nevertheless,a number of EMPs do have a strong correlation with improving innovation performance in variouscompanies. It is also interesting to note that a negative correlation exists between the Environmentalstandard for suppliers and Sales growth. This is possibly due to increasing operational costs and a delay inmarket acceptance. This research illustrates the possibility of using standard environmental data fromGRI reports as a resource for future studies of EMPs. In order to improve long-term financial performance,this study also suggests that innovation should gain a substantial amount of attention when EMPsare employed.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Environmental management practices; Company performance; Global reporting initiative ; Manufacturing industry; Empirical research
National Category
Environmental Management Economics and Business
Identifiers
urn:nbn:se:liu:diva-113755 (URN)10.1016/j.jclepro.2014.02.001 (DOI)000356194300005 ()
Funder
VINNOVA
Available from: 2015-01-29 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved
Wei, S., Tang, O. & Sundin, E. (2015). Core (product) Acquisition Management for remanufacturing: a review. Journal of Remanufacturing (4)
Open this publication in new window or tab >>Core (product) Acquisition Management for remanufacturing: a review
2015 (English)In: Journal of Remanufacturing, ISSN 2210-4690, no 4Article, review/survey (Refereed) Published
Abstract [en]

Core acquisition is essential for the success of remanufacturing business. To describe the current status of the quantitative research in Core Acquisition Management and to indicate possible future research directions, a literature review is conducted in this paper about the quantitative modeling in Core Acquisition Management research area. The activities included in Core Acquisition Management are categorized into topics such as acquisition control, forecasting return, return strategies, quality classification and reverse channel design. While most of the studies focus on acquisition control, studies on return strategies and return forecast are relatively limited. Furthermore, this paper analyzes the research papers according to the key assumptions such as, hybrid/non-hybrid remanufacturing systems, acquisition functions, quality classification methods and perfect/imperfect substitutions. In conclusion, studies based on the assumptions of non-hybrid remanufacturing systems and imperfect substitution should gain more attentions, since these situations frequently occur in practice but are less investigated in the existing literature. In addition, empirical validation of the various forms of the acquisition function (relations between acquisition incentives and acquisition volume) should be important for further investigations.

Place, publisher, year, edition, pages
Springer, 2015
Keywords
Remanufacturing, acquisition, core, closed-loop supply chain, review
National Category
Economics and Business Other Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-113243 (URN)10.1186/s13243-015-0014-7 (DOI)
Note

At the time for thesis presentation publication was in status: Manuscript

Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05Bibliographically approved
Chen, L. & Tang, O. (2015). Does supplier involvement affect Swedish manufacturers’ sustainability?.
Open this publication in new window or tab >>Does supplier involvement affect Swedish manufacturers’ sustainability?
2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

This study examines the moderating role of supplier involvement in the focal company’s sustainable initiatives. Survey methodology was used to collect data from 349 Swedish manufacturers. Partial least squares structural equation modeling was then applied to analyze the causal relationships and moderating effects. The results showed that there was a significant positive relationship between sustainable drivers and sustainable improvement practices within the focal company itself. The focal company’s sustainable improvement practices significantly contributed to its sustainable performance. Moreover, the high levels of supplier involvement in environment-related work significantly strengthened the relationship between the focal company’s sustainable practices and performance. This study contributes to the literature in the field of green supply chain management. The results indicate not only that a “win-win” opportunity exists for members of the Swedish manufacturing industry who implement sustainable practices, but also that organizational green capabilities can be strengthened by cooperating with suppliers through organizational learning.

Keywords
Corporate social responsibility, Corporate sustainability, Empirical research, Organizational sustainability cooperation, Structural equation model, Supplier involvement, Sweden
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:liu:diva-121051 (URN)
Available from: 2015-09-03 Created: 2015-09-03 Last updated: 2015-09-03Bibliographically approved
Wei, S., Cheng, D., Sundin, E. & Tang, O. (2015). Motives and barriers of the remanufacturing industry in China. Journal of Cleaner Production, 94, 340-351
Open this publication in new window or tab >>Motives and barriers of the remanufacturing industry in China
2015 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, ISSN 0959-6526, Vol. 94, p. 340-351Article in journal (Refereed) Published
Abstract [en]

Realizing the importance of remanufacturing for sustainable development due to the large scale of the economy and its increasing pressure on the environment, the Chinese government has been strongly promoting its remanufacturing industry since 2008. The objective of this paper is to identify the motives and barriers for remanufacturing in China. According to the survey conducted among remanufacturers in China, environmental and ethical responsibility, customer orientation and strategic advantage are the three most important motives, while customer recognition is the most serious barrier at present. This survey also shows that there are many differences between car part and machinery remanufacturers in China. For example, car part remanufacturers are more motivated by subsidies, at the same time, they are also more restricted by legislation, while lack of sales channels is a more serious barrier for the machinery remanufacturers. The differences exist partly due to the Chinese remanufacturing environment, for example the policies from different government departments that regulate the related industries. Suggestions for improving the remanufacturing industry, in particular from the policy makers’ perspective, are provided according to the survey results.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Remanufacturing, drivers, challenges, China, survey
National Category
Economics and Business
Identifiers
urn:nbn:se:liu:diva-113244 (URN)10.1016/j.jclepro.2015.02.014 (DOI)000353741400034 ()
Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05
Shuoguo, W. & Tang, O. (2015). Real option approach to evaluate cores for remanufacturing in service markets. International Journal of Production Research, 53(8), 2306-2320
Open this publication in new window or tab >>Real option approach to evaluate cores for remanufacturing in service markets
2015 (English)In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 53, no 8, p. 2306-2320Article in journal (Refereed) Published
Abstract [en]

Acquisition of cores is important for the success of remanufacturing business, but evaluating the value of cores is difficult due to many uncertain issues in the remanufacturing system. In this paper, we examine the value of cores using the real option valuation (ROV) approach, which well captures the production flexibility and represents different operations options in remanufacturing. First, in a system where the demand of remanufactured products is low, we focus on the uncertainty of price. We compare the cases where disposing cores occurs only at the expiration time and before that. The model also identifies under which circumstances disposing core early brings in more benefit. Furthermore, we study a remanufacturing system where demand and return are both uncertain. In this case, a spread option is used for evaluating the marginal value of obtaining additional cores. This approach also brings the advantage of linking the correlation between demand and return, which in fact is often exhibited in remanufacturing. The numerical experiments indicate that this correlation has an impact on collecting policies. This study illustrates the possibility of using ROV for core pricing modelling, and the study results also provide some managerial insights in managing returned cores.

Place, publisher, year, edition, pages
Taylor & Francis, 2015
Keywords
Remanufacturing, cores, real option valuation
National Category
Economics and Business
Identifiers
urn:nbn:se:liu:diva-113247 (URN)10.1080/00207543.2014.939243 (DOI)000349395700004 ()
Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05
Shuoguo, W., Tang, O. & Liu, W. (2015). Refund policies for cores with quality variation in OEM remanufacturing. International Journal of Production Economics, 170, 629-640
Open this publication in new window or tab >>Refund policies for cores with quality variation in OEM remanufacturing
2015 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 170, p. 629-640Article in journal (Refereed) Published
Abstract [en]

Cores are essential for the remanufacturing business. The lack of cores with proper quality is reported as a highly ranked factor that limits both third party and OEM (Original Equipment Manufacturer) remanufacturers. To encourage the return of quality cores, in practice it is common for OEMs to charge a certain amount of deposit, and refund it fully or partially depending on the quality of cores during the return process. Furthermore, the core quality varies and leads to different remanufacturing costs. The core refund policy should reflect such differences, in order to encourage the customers to return the cores with “correct” quality. In this paper, we propose three refund policies and develop profit maximization model for the remanufacturer. Under the assumption of quality following a uniform distribution, we develop analytical solutions for the refund policies and principles for quality partition. Numerical examples indicate that the customers׳ valuation of core is an important factor influencing the return rates and the economics performance of the system as well. Multiple refund policy with a small number of quality classes already brings major advantages, even with a market where the competition for collecting cores is relatively high. The study is also extended to the cases that core quality follows an adjusted normal distribution. Credit refund policies are also studied for comparison purpose.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Remanufacturing; Deposit; Refund policy; Quality classes
National Category
Economics and Business
Identifiers
urn:nbn:se:liu:diva-113249 (URN)10.1016/j.ijpe.2014.12.006 (DOI)000367486100025 ()
Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05Bibliographically approved
Chen, L., Feldmann, A. & Tang, O. (2015). The relationship between disclosures of corporate social performance and financial performance: Evidences from GRI reports in manufacturing industry. International Journal of Production Economics, 170, 445-456
Open this publication in new window or tab >>The relationship between disclosures of corporate social performance and financial performance: Evidences from GRI reports in manufacturing industry
2015 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 170, p. 445-456Article in journal (Refereed) Published
Abstract [en]

Whether the corporate social performance affects the financial performance is still unclear in many manufacturing companies. We commonly expect, on one side, that profitable corporations have stronger incentives to reveal information on social performance in order to improve their publicity; on the other hand, companies may face the fear of rising costs due to Corporate Social Responsibility (CSR) activities. With increasing concerns of CSR, it is timely to investigate the relationship between the disclosure of corporate social performance and financial performance. In this paper with the above study objective, we use Global Reporting Initiative (GRI) reports of 75 sample companies, collect evidences by applying the method of structured content analysis of the cases and attempt to identify this relationship. The corporate social performance is measured by the indicators according to the GRI guidelines, i.e. within the categories of Labor practices and decent work, Human Rights, Society as well as Product responsibility. Financial performance is measured by return on equity, sales growth and cash flow/sales ratio. Using statistical evaluation methods, our results indicate that the categories of Human Rights, Society as well as Product responsibility display a significant and positive correlation with the return on equity. Same conclusion also holds for many CSR indicators. Nevertheless, when examining the CSR practices across different manufacturing sectors, we have not observed significant differences. The study results are important for understanding the development and implementation of CSR practices in the manufacturing industry.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
corporate social responsibility, disclosures of social performance, financial performance, Global Reporting Initiative, empirical research
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:liu:diva-117443 (URN)10.1016/j.ijpe.2015.04.004 (DOI)000367486100009 ()
Available from: 2015-04-27 Created: 2015-04-27 Last updated: 2017-12-04
Wang, D., Tang, O. & Zhang, L. (2014). A periodic review lot sizing problem with random yields, disruptions and inventory capacity. International Journal of Production Economics, 155, 330-339
Open this publication in new window or tab >>A periodic review lot sizing problem with random yields, disruptions and inventory capacity
2014 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 155, p. 330-339Article, review/survey (Refereed) Published
Abstract [en]

This paper examines a periodic-reviewed lot sizing problem with random yields, disruptions and limited inventory capacity. To characterise the continuous production, an additive random yield model is considered rather than a multiplicative one. Disruptions cause breakdowns to production. Inventory capacity is included since the production has to be shut down when the inventory buffer is full. Both disruptions and shutdowns lead to a start-up cost and a stochastic lead time to recover the production. These compound factors of uncertainty are encountered in practical planning decisions in process industries. We review the existing random yield models, which are then compared with the additive model. With a linear production cost, the additive model has an order-up-to policy to be optimal. Disruptions deteriorate the expected actual production quantity and the fill-rate dramatically, even though the optimal order-up-to level increases compared with the cases of no disruption. Considering inventory capacity makes the problem to be a non-convex dynamic programming problem. Numerical analysis shows that the performance is dramatically deteriorated when the inventory capacity is rather tight, which indicates the importance of selecting a proper inventory capacity to reduce the negative impacts and avoid redundant investment on capacity. Moreover, the start-up cost plays an important role in determining the level of inventory capacity.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Lot sizing; Production planning; Random yield; Disruption; Inventory capacity
National Category
Economics and Business
Identifiers
urn:nbn:se:liu:diva-111267 (URN)10.1016/j.ijpe.2014.02.007 (DOI)000341466000035 ()
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF)

Available from: 2014-10-15 Created: 2014-10-14 Last updated: 2017-12-05
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