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Urban stormwater has become a persistent concern on a global scale due to its adverse environmental implications. It is the prime vector of aquatic contaminants worldwide that causes pollutants when water bodies drain. Bioretention... more
Urban stormwater has become a persistent concern on a global scale due to its adverse environmental implications. It is the prime vector of aquatic contaminants worldwide that causes pollutants when water bodies drain. Bioretention systems are increasingly used to alleviate setbacks associated with stormwater run-off in urban locales. It has played a substantial role in the implementation of low impact development (LID), a concept that addresses urban stormwater problems caused by land changes and development. The use of LID technologies is an innovative approach. However, it is beset with challenges, such as the insufficiency of data on rainfall distribution and difficulty in interpreting data. To address these research gaps, the present study developed a fuzzy rough set data algorithm for bioretention systems. Event mean concentration calculations and fuzzification of rainfall were performed to produce a rough set-based decision rule. Using the Weibull probability distribution, fu...
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Research Interests:
Leaf area can be used as a growth parameter as such it increases as the stage of lettuce progress. Consideration of scale invariance in estimating the area poses challenging machine vision problems in a smart farm setup. To address this,... more
Leaf area can be used as a growth parameter as such it increases as the stage of lettuce progress. Consideration of scale invariance in estimating the area poses challenging machine vision problems in a smart farm setup. To address this, a marker with known size and components is utilized for the system for normalizing area measurements. This study proposes an automated object detection (marker) using Viola-Jones algorithm that uses Haar features. Based on the result of this study, a high detection rate applied to 40 test samples is obtained by using 30 positive samples and 50 negative samples. The small sample size is compensated by increased number of stages and decreased lower false positive rate for each stage. Future work includes adding training sets and using other methods such as Speeded Up Robust Features (SURF).
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Research Interests:
In the building sector which has been Portland cement (OPC)-based for the past century, geopolymers have emerged to have the potential to become the new norm. Its technical properties have been shown to be comparable if not better and its... more
In the building sector which has been Portland cement (OPC)-based for the past century, geopolymers have emerged to have the potential to become the new norm. Its technical properties have been shown to be comparable if not better and its production results in as much as 80% reduction in CO2 emissions compared to OPC. Moreover, sustainability is accessible since geopolymers, synthesized via alkali activation of amorphous alumino-silicate materials, can be formed from alumina- and silica- rich industrial and agro-industrial wastes such as coal ash and rice hull ash. Synthesis of geopolymers are determined by three sets of factors: raw materials used (type, mineral composition, mix ratio, particle size, etc.), alkali activator (type, mix proportion, pH, liquid-to-solid ratio, etc.), and synthesis and curing conditions (curing time, curing temperature, applied pressure, etc.). These set of factors have to be identified for optimum properties of the geopolymers formed. As raw materials ...
ASEAN Journal of Chemical Engineering, vol. 2 no.1 (2002). ...
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ABSTRACT The potential benefits from algal biofuels, such as reduced greenhouse gas emissions, come with natural resource consumption and potentially negative environmental and social impact. A multi-criterion approach based on analytic... more
ABSTRACT The potential benefits from algal biofuels, such as reduced greenhouse gas emissions, come with natural resource consumption and potentially negative environmental and social impact. A multi-criterion approach based on analytic hierarchy process (AHP) and Monte Carlo simulation is proposed to holistically evaluate the suitable cultivation system for sustainable production of algal biofuels. The multiple criteria identified to evaluate the alternatives are: environmental impact, energy consumption, economic viability, technical considerations, and social acceptability. Sub-criteria are defined from these main criteria to further enhance the evaluation of each cultivation system. A case study using Nannochloropsis sp. is then solved to demonstrate the decision model for the following cultivation systems: open pond, flat-panel photobioreactor, and horizontal tubular photobioreactor. The results show that flat panel photobioreactor is the preferred cultivation system to sustainably produce algal biofuels based on the established multi-criterion evaluation using AHP.
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In our previous paper, a fuzzy bi-level programming model was developed to determine optimal interplant water integration networks in eco-industrial parks (EIPs). This approach allowed the appropriate incentive mechanisms, in the form of... more
In our previous paper, a fuzzy bi-level programming model was developed to determine optimal interplant water integration networks in eco-industrial parks (EIPs). This approach allowed the appropriate incentive mechanisms, in the form of fresh water and effluent fees as well as water reuse subsidies, to be optimized from the perspective of the EIP authority. This work extends the original mathematical
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... Related Content Design and Implementation of Students' Information System for Tertiary Institutions Using Neural Networks: An Open Source Approach Obiniyi Ayodele Afolayan, and Ezugwu El-Shamir Absalom (2010).... more
... Related Content Design and Implementation of Students' Information System for Tertiary Institutions Using Neural Networks: An Open Source Approach Obiniyi Ayodele Afolayan, and Ezugwu El-Shamir Absalom (2010). International Journal of Green Computing (pp. 1-15). ...
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There is an identifiable need to provide focused support for training and business in sustainable development. The aim of the project is to develop, test and disseminate three open learning units allied to the subject area of sustainable... more
There is an identifiable need to provide focused support for training and business in sustainable development. The aim of the project is to develop, test and disseminate three open learning units allied to the subject area of sustainable development. The project relies on a consortium of five university partners located in the UK, Sweden, Malaysia, North Philippines and South Philippines.
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SUMMARY This report gives the findings of a study commissioned by WWF to estimate the carbon footprint of tuna fisheries. Carbon footprint, which indicates the carbon dioxide emissions generated by a product system or supply chain per... more
SUMMARY This report gives the findings of a study commissioned by WWF to estimate the carbon footprint of tuna fisheries. Carbon footprint, which indicates the carbon dioxide emissions generated by a product system or supply chain per unit of output on a life cycle basis, provides a quantitative index of potential adverse impacts with respect to climate change. The carbon footprint can be computed using extended Leontief input-output models based on "top-down" or "bottom-up" data. Initial attempts using top-down data appear to underestimate the total carbon footprint. The initial estimates were revised using activity- and process- based ("bottom-up") data for different types of fishing gear, as well as various alternative scenarios for downstream processing and logistics. One of the main findings is that fishery fleet fuel consumption is typically the largest contributor to overall carbon footprint. Purse seine fishing gives the lowest carbon footprint ...
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... The basis and structure of the model is described and this leads to a summary application to the case of pulp and paper manufacture. 2. Rationale for sustainability model development. ... These rules are made as simple as possible. 4.... more
... The basis and structure of the model is described and this leads to a summary application to the case of pulp and paper manufacture. 2. Rationale for sustainability model development. ... These rules are made as simple as possible. 4. The sustainability model. Fig. ...
Research Interests: Environmental Engineering, Chemical Engineering, Expert Systems, Cleaner Production, Decision Making, and 14 moreSustainable Development, Life Cycle Assessment, Environmental Impact Assessment, Environmental Sustainability, Knowledge Based System, Pulp and Paper, Manufacturing Processes, Process Improvement, Manufacturing Engineering, expert System, Life Cycle, Environmental Impact, Interdisciplinary Engineering, and Life Cycle Analysis
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Global water stress is expected to increase due to population growth, economic development and climate change. Because of this trend, there is an increased interest in the water intensity of industrial activities conducted via the product... more
Global water stress is expected to increase due to population growth, economic development and climate change. Because of this trend, there is an increased interest in the water intensity of industrial activities conducted via the product supply chain or within specified geographical boundaries or regions, both at the enterprise- or regulatory-level. The total water footprint of economic activities should be evaluated in consideration of local water resource consumption, virtual water trade and resource availability. As individual entities seek to protect their respective interests, the challenge is to optimize inter-regional trade of goods with the consideration of the interests of participants in the network. This work presents a fuzzy input–output model for optimizing supply chains under water footprint constraints. Two case studies, involving tile manufacturing and biofuel production, are considered to demonstrate the use of the model.
Research Interests: Environmental Engineering, Climate Change, Cleaner Production, Economic Development, Supply Chain, and 12 moreWater Footprint, Case Study, Manufacturing Engineering, Water Stress, Virtual Water, Population Growth, Fuzzy optimization, Interdisciplinary Engineering, Water Resource, Muilti-region input-output model, Input Output, and Resource Availability
A fuzzy linear programming extension of the general life cycle model is described. The model is suitable for applications involving system design and optimization wherein fuzzy target levels for environmental flows or impacts are... more
A fuzzy linear programming extension of the general life cycle model is described. The model is suitable for applications involving system design and optimization wherein fuzzy target levels for environmental flows or impacts are specified, and wherein multiple technological alternatives capable of providing equivalent products or services are present within the life cycle boundaries. Solving the model results in an
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... A Diagnostic Model for Green Productivity Assessment of Manufacturing Processes Ruby Pineda-Henson~* and Alvin B. Culaba z XDept. ... By ratio and proportion, the GP index for test sce-Table 3: Green productivity indicators ...
Research Interests: Environmental Engineering, Life Cycle Assessment, Continuous Improvement, Analytic Hierarchy Process, Resource use, and 15 moreImpact Factor, Multicriteria Decision Analysis, Case Study, Building, expert System, Decision Support, Life Cycle, Life Cycle Inventory, Knowledge base, Scenario Analysis, Product Life Cycle, Environmental Performance, Input Output, Resource Utilization, and Performance Measure
... Accepted 12 September 2001 *Correspondence to Raymond Tan, Department of Chemical Engineering, De La Salle University, 2401 Taft Avenue, 1004 Manila, Philippines. y E-mail: coert@mail.dlsu.edu.ph z E-mail: mike.purvis@port.ac.uk Page... more
... Accepted 12 September 2001 *Correspondence to Raymond Tan, Department of Chemical Engineering, De La Salle University, 2401 Taft Avenue, 1004 Manila, Philippines. y E-mail: coert@mail.dlsu.edu.ph z E-mail: mike.purvis@port.ac.uk Page 2. ...
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Research Interests:
Research Interests: Life Cycle Assessment, Environmental Design, Multidisciplinary, Decision support system, Visual basic, and 13 moreUncertain Data, Impact Assessment, Case Study, New Car Model Design, Alternative Fuel, Scenario Analysis, Uncertainty propagation, Industrial Production, Multiple Criteria, Electricity Generation, Department of Energy, Compromise Programming, and Inventory Model
... Corresponding author. Email: raymond.tan@dlsu.edu.ph ISSN 0305-215X print/ISSN 1029-0273 online © 2010 Taylor & Francis DOI: 10.1080/0305215X. 2010.486031 http://www.informaworld.com Page 2. 2 KB Aviso et al. ...
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ABSTRACT A multi-functional bioenergy system is an efficient way for producing multiple energy products from biomass, which results in near-zero carbon emissions. To achieve net negative carbon emissions, biochar production as carbon... more
ABSTRACT A multi-functional bioenergy system is an efficient way for producing multiple energy products from biomass, which results in near-zero carbon emissions. To achieve net negative carbon emissions, biochar production as carbon sequestration can be integrated in the system. A fuzzy mixed-integer linear programming model is developed to simultaneously design and optimize a multi-functional bioenergy system given multiple product demands, carbon footprint, and economic performance constraints. Case studies are presented involving multi-functional bioenergy systems with biochar production for carbon sequestration. The results show that net negative carbon footprint can be achieved in such systems.
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ABSTRACT Trigeneration systems offer an inherently efficient, low-carbon approach to producing useful energy streams. Due to multiple products from a trigeneration system, the challenge of allocating carbon footprint to each energy stream... more
ABSTRACT Trigeneration systems offer an inherently efficient, low-carbon approach to producing useful energy streams. Due to multiple products from a trigeneration system, the challenge of allocating carbon footprint to each energy stream arises, particularly if the streams are sold to different customers. A fuzzy fractional programming model is proposed to design a trigeneration system, taking such allocation into account. The model allows for solving for a configuration that gives the minimum carbon footprint for each energy stream, given a range of values for demand for each product in a trigeneration system. The final design must meet a specified energy output requirement, while satisfying fuzzy carbon footprint limits for all products. The methodology is illustrated using hypothetical but realistic case studies. Sensitivity analysis was carried out to show the effects of changing the system carbon footprint limits.
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... KB Aviso Į RR Tan (&) Į AB Culaba Center for Engineering and Sustainable Development Research, De La Salle University, 2401 Taft Avenue, 1004, Manila, Philippines e-mail:raymond.tan@dlsu.edu.ph AB Culaba... more
... KB Aviso Į RR Tan (&) Į AB Culaba Center for Engineering and Sustainable Development Research, De La Salle University, 2401 Taft Avenue, 1004, Manila, Philippines e-mail:raymond.tan@dlsu.edu.ph AB Culaba e-mail: alvin.culaba@dlsu.edu.ph 123 ...
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... for policy and analysis Hassel D, Weber FJ (1997) Gradient influence on emission and ... Davis Lin J, Niemeier D (2003) Estimating regional air quality vehicle emission inventories ... In proceedings of dissemination conference on... more
... for policy and analysis Hassel D, Weber FJ (1997) Gradient influence on emission and ... Davis Lin J, Niemeier D (2003) Estimating regional air quality vehicle emission inventories ... In proceedings of dissemination conference on ''New Develop-ments in Emission Estimation from ...
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A preliminary analysis has been conducted to investigate the fuel use and emissions reduction potential of incorporating hybrid systems to two stroke powered tricycles in Metro Manila. Carbureted and direct injection two stroke engine... more
A preliminary analysis has been conducted to investigate the fuel use and emissions reduction potential of incorporating hybrid systems to two stroke powered tricycles in Metro Manila. Carbureted and direct injection two stroke engine hybrid systems were investigated and compared with the impact of shifting to four stroke engines. Results showed that hybridized direct injection retrofitted two stroke powered systems
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Page 1. ORIGINAL PAPER Application of rough sets for environmental decision support in industry Kathleen B. Aviso Æ Raymond R. Tan Æ Alvin B. Culaba Received: 28 September 2007 / Accepted: 12 October 2007 / Published ...
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Research Interests: Engineering, Chemical Engineering, Climate Change, Bioenergy, Modeling, and 15 moreEnergy Security, Carbon Footprint, Energy demand, Land Use, Energy Balance, Chemical Engineering Design, Fuzzy optimization, Life Cycle Model, Life Cycle Analysis, Land Use Pattern, Large Scale, Input Output, Multiple Objectives, Energy Crop, and Optimal Solution
Carbon dioxide inventory implications of a biodiesel program in the Philippines are assessed. Biodiesel is assumed to be the methyl ester of coconut oil. Different scenarios for the use of agricultural residues as fuel for heat or power... more
Carbon dioxide inventory implications of a biodiesel program in the Philippines are assessed. Biodiesel is assumed to be the methyl ester of coconut oil. Different scenarios for the use of agricultural residues as fuel for heat or power generation are analyzed. Reduction in net CO2 emissions are estimated at 77–104g/MJ of diesel displaced by biodiesel. These benefits are found to
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Research Interests: Engineering, Economics, Control Theory, Bioenergy, Modeling, and 15 moreInformation Flow, Numerical Simulation, Development policy, Biofuel, Case Study, Feedback Control, Dynamic systems, Applied Energy, Natural Resource, Dynamic Systems, Dynamic Model of WSN, Input Output, Dynamic System, dynamic model, and Econometric Model
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Research Interests:
Cardiologists' Awareness of the Effects of Air Pollution on Cardiovascular Disease in Vietnam and the Philippines – Descriptive Evaluation..........................................................7 Quynh T. Nguyen, Raouf NG Naguib,... more
Cardiologists' Awareness of the Effects of Air Pollution on Cardiovascular Disease in Vietnam and the Philippines – Descriptive Evaluation..........................................................7 Quynh T. Nguyen, Raouf NG Naguib, Mohyi H. Shaker, Michail Papathomas, and Alvin B. Culaba ... MoHTAM: A Technology Acceptance Model for Mobile Health Applications ................................ .......13 Abdul Hakim HM Mohamed, Hissam Tawfik, Dhiya Al-Jumeily, and Lin Norton ... Expanding Tele-care: Using Motion Sensors for Monitoring Purposes ................................................19 ...
In order to minimize the consumption of resources and the generation of waste, eco-industrial parks (EIPs) have been designed to encourage the establishment of waste exchange networks between the plants contained within them. Considering... more
In order to minimize the consumption of resources and the generation of waste, eco-industrial parks (EIPs) have been designed to encourage the establishment of waste exchange networks between the plants contained within them. Considering that the participating plants have their individual fuzzy cost goals and that the park authority has the objective of minimizing total freshwater consumption in the EIP,