In this review paper (Leong et al. 2019), the origin development and contribution of lean manufacturing and green manufacturing are first explored. Based on the literature review, there is no proper definition for lean and green. Therefore, Leong et al. (2019) explored the application and impact of lean and green approach in the manufacturing industry to promote sustainable manufacturing. Similarities and benefit of both lean and green approaches are identified and implementation strategies are presented.
Papers on Energy IndustryFive papers in the Special Issue cover the developments of advanced energy systems. These include optimization of polygeneration system (Ray and De 2019), critical analysis of biomass tri-generation systems (Andiappan et al. 2019), modeling of solar and biomass hybrid power generation (Suresh et al. 2019), optimization of oxy-combustion, and gasification power plant (Wang et al. 2019) as well as assessment of energy end-use technologies in India's households (Kumar Singh et al. 2019).India is an economic powerhouse in the Asian-Pacific Region with a fast-growing energy demand. The current transition towards sustainable energy offers important opportunities for this region. This Special Issue features three papers on the subject of sustainable energy in India. Ray and De (2019) study the impact of modern energy-efficient technologies in India. Their focus is on the generation of various forms of energy from various inputs. In particular, an optimization method is developed for a polygeneration system that has renewable sources such as solar, biomass, and wind as an input and electricity and chemicals as an output. A case study shows how the method can be used to lower electricity costs for a village located in India. Kumar Singh et al. (2019) presents a comprehensive framework for an economic inputoutput model including lifecycle assessment. A data-driven analysis shows how such a multi-perspective approach can predict the impact of investments in various energy-efficient appliances in India's residential sector. Intermittence of renewable energy sources such as solar and wind is often a challenge. Suresh et al. (2019) recognizes the importance of solar power plants for India, which urges new approaches to solve the intermittence problem. They present a case study of a solar power plant that is combined with biofuels to achieve a stable power generation from renewable energy sources. The results demonstrate the viability and stability of such system.Energy systems are getting increasingly more complicated due to tighter integration of various components. In order to optimize the energy system as a whole, model reduction methods are often needed. Wang et al. (2019) presents a model reduction method that allows for the simultaneous optimization of an air separation unit and a gas turbine in an integratedgasification-combined-cycle (IGCC) power plant. The