Changkyoo Yoo

Changkyoo Yoo
Kyung Hee University · Department of Environmental Science and Engineering

About

307
Publications
75,574
Reads
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7,647
Citations
Citations since 2016
90 Research Items
4749 Citations
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
Additional affiliations
November 2002 - October 2004
Ghent University
Position
  • PostDoc Position

Publications

Publications (307)
Article
Underground building spaces such as metro stations have been widely adopted in densely populated metropolitan cities to combat high traffic congestion. To ensure a sustainable underground environment, early warning systems, primarily for fine particulate matter, and ventilation control, are of great significance. However, these techniques require s...
Article
Classical consumer communities are gradually turning to energy prosumers who employ innovative and self-sufficient systems. Despite the importance of wastewater treatment plants (WWTPs) in environmental protection and public health, they still consume considerable energy. This study employs bi-level nonlinear optimization models and a systematic pl...
Article
Optimal hybrid renewable microgrids Sustainable development Techno-econo-socio-environmental model Water-energy-carbon nexus A B S T R A C T Combined technological, economic, sociological, and environmental (TESE) models can play a unique role in leveraging renewable energies and supporting sustainable development. Yet, a multi-aspect TESE model ha...
Article
Climate change, resource scarcity, waste reduction, and the lack of sustainability in process industries are vital concerns that civilization confronts. The process integration methodology may aid such sustainability. In this study, a novel chemical exergy resource recovery network is proposed for optimal energy and waste recovery in high-salinity-...
Article
Recently, several countries have focused on industrial decarbonization to ensure that the net emissions of carbon dioxide reach zero and contribute to decreasing the global mean temperature. This study aims to investigate the feasibility of a net-zero carbon roadmap for the petrochemical industry by 1) developing an explainable artificial intellige...
Article
The spatial and temporal variability of renewable energy resources, particularly wind energy, should be statistically evaluated to achieve sustainable economic development to mitigate climate change. In this study, a non-Gaussian multivariate statistical monitoring approach is proposed to investigate the wind speed frequencies across different regi...
Article
Global transactive energy has become more complex due to the extension of its efficiency. Thus, multi-residential demand responses pose a new challenge in the critical infrastructure of power transition networks in energy planning and management. By encompassing optimal scheduling with strategic energy decentralization, a reliable distribution netw...
Article
Over the past decades, forecasting electricity demand has been crucial in energy planning and power distribution management to establish sustainable strategies in undeveloped countries. This work proposes an integrated approach to evaluate Pakistan's energy sector and holistically investigate electricity-load strategies to prioritize them and preve...
Article
A holistic analytical and smart management approach is proposed to investigate the performance of renewable-based tri-generation system to generate power, cooling, and domestic hot water with a simultaneous consideration of several operational, design, and system feasibility aspects in a framework. The proposed configuration consisted of a solar dr...
Article
A mature and hybrid machine-learning model is verified by mature empirical analysis to measure county-level COVID-19 vulnerability and track the impact of the imposition of pandemic control policies in the U.S. A total of 30 county-level social, economic, and medical variables and a timeline of the imposed policies constitutes a COVID-19 database....
Article
A main challenge in rapid nitrogen removal from rejected water in wastewater treatment plants (WWTPs) is growth of biomass by nitrite-oxidizing bacteria (NOB) and ammonia-oxidizing bacteria (AOB). In this study, partial nitritation (PN) coupled with air-lift granular unit (AGU) technology was applied to enhance nitrogen-removal efficiency in WWTPs....
Conference Paper
Full-text available
Climate change is a global crisis to the world which influences the human race and society's development. Threatens of climate change have become increasingly recognized to the public and government in both environments, society, and economy across the globe; because the consequence of climate change is not only shown up as the increasing of global...
Article
In biological wastewater treatment plants (WWTPs), sludge thickening is a common problem with major economic and environmental effects. Monitoring the sludge volume index (SVI) is a critical difficulty in sludge bulking quantification. This study develops a hybrid deep-learning-based soft sensor that uses a sparse constraint stacked autoencoder (SA...
Article
Traditional process integration approaches necessitate the allocation of external hot and cold utilities to avoid violating the Second Law of thermodynamics. Consequently, energy systems contribute significantly to anthropogenic climate change by emitting considerable greenhouse gases and losing substantial water for cooling in their hot and cold u...
Article
Safety-risk management in the hydrocarbon processing industry necessitates the availability of appropriate data and decision-making tools. Operational factors may influence chemical and physical risk occurrences associated with high-hazard plant operation in the chemical process sectors. Thus, safety-risk technologies and assessments should be expl...
Article
The significant operational cost of membrane maintenance is an important issue to overcome alongside the membrane replacement time. We propose a membrane lifetime estimation method via functional machine learning (FML) using 12 biological-chemical-physical functional parameters and a predictive maintenance system for membrane replacement based on A...
Article
Full-text available
Hydropower stations have supplied most of the green electricity in various parts of the world. Nonetheless, the economic profit of hydroelectricity lies beyond its social costs in many cases. Despite the short-term economic benefits of large dams, their sustainable pros and cons are doubted. This study aims to investigate the long-term profitabilit...
Article
Numerous integrated desalination systems have been proposed to satisfy the growing global demand for freshwater. However, the responses of various optimal configurations have rarely been subject to advanced combined analyses. Here, a parallel-feed multi-effect evaporative desalination unit is integrated with a series double-effect water-lithium bro...
Chapter
Biofuel from microalgae is one of the promising solutions on addressing climate change by its possibility of reducing the fossil fuel dependency. Till-date, the overall competitiveness of microalgae based biorefinery is the major concern due to its unique operational mechanism, especially the biological growth of microalgae that fluctuates towards...
Article
This study developed a data-based soft-sensor to predict indoor PM2.5 from easy-to-measure outdoor and indoor air variables. The method consists of neural circuit policies (NCP), nature-inspired liquid time-constant networks (LTC), a subclass of continuous recurrent neural networks (RNN) represented by an ordinary differential equation (ODE) system...
Article
In the water industry, a state-of-the-art membrane bioreactor (MBR) requires relatively high operation expenditures due to foulants continually accumulating and clogging the surface and pores of the membrane. Hence, with the advent of digital innovations, developing an innovative tool based on data-driven approaches for membrane maintenance is impo...
Article
Missing data imputation and automatic fault detection of wastewater treatment plant (WWTP) sensors are crucial for energy conservation and environmental protection. Given the dynamic and non-linear characteristics of WWTP measurements, the conventional diagnosis models are inefficient and ignore potential valuable features in the offline modeling p...
Article
In this study, an optimal scheme is proposed by utilizing waste streams at a plant-wide scale along with pressure retarded osmosis (PRO) membrane allocation in complex industrial networks for energy recovery. Chemical exergy pinch analysis (ChExPA) and process graph (P-graph) are used to address the problem. The ultimate goals of utilizing the tool...
Article
This paper aims to develop the mathematical model of electricity based on renewable energy and large-scale utility (eRELU) networks to achieve a low-carbon economy. Huge petrochemical industries allocated in South Korea are considered to evaluate the proposed model by techno-economic and environmental assessment subject to Korean renewable energy p...
Article
With the rising demand for hydrogen in petrochemical and refineries complexes, the optimisation of hydrogen utility is getting more attention. Through inter-plant hydrogen integration (IPHI), the overall hydrogen consumption and purged gases could be further reduced by exchanging hydrogen gases among multiple plants. In this work, a P-graph methodo...
Article
Conventional steam-driven multigeneration systems contribute to environmental damage by losing significant freshwater and emitting greenhouse gases. Here, a novel solar-powered steam jet ejector-based multigeneration system independent of external cold utilities is proposed for climate change adaptation. A Rankine cycle, an organic Rankine cycle, a...
Article
Wastewater treatment plants (WWTPs) influent conditions can dramatically affect a treatment unit's state and effluent quality. WWTP sensors may record faulty measurements due to abnormal events or the malfunction of the system, leading to serious problems in the system's operation and the violation of effluent discharge standards. Therefore, automa...
Preprint
Full-text available
Along with the accelerated process of urbanization, the contradiction between social development and environment become increasingly conspicuous. Herein, we access the transport and fate of polycyclic aromatic hydrocarbons (PAHs) by a newly proposed multiple land-use fugacity (MLUF) model to provide comprehensive understanding of PAHs distribution...
Article
Nowadays, the transportation sector occupies a vital role in current society. However, this sector is the second-highest greenhouse gas emitter worldwide due to fossil fuel combustion. Transitioning from conventional to renewable energy propulsion is a promising alternative to climate change mitigation. This study proposes a smart decision-making a...
Article
This study develops a multi-objective supervisory control (MOSC) strategy for wastewater treatment based on hybrid machine-learning algorithms that search optimal setpoints of multiple controllers under varying influent conditions. A wastewater treatment plant (WWTP) operation was modeled by Benchmark Simulation Model No. 2 (BSM2), and influent con...
Article
The conversion of biomass (or agriculture residues) to organic fertilizer is a common practice in developing countries. This study aims to develop a novel multi-criteria decision-making approach towards sustainable fertilization that incorporates both organic and chemical fertilizers with the consideration of economic, environmental, and health asp...
Article
Optimal operational strategies for wastewater treatment plants have been employed widely to improve the economic and environmental operations. However, inadequate optimization systems have been applied to membrane bioreactor (MBR) plants, resulting in high energy consumption due to uncertain influent associated with complex biological and physical...
Article
Polycyclic aromatic hydrocarbons (PAHs) are hazardous compounds associated with respiratory disease and lung cancer. Increasing fossil fuel consumption, which causes climate change, has accelerated the emissions of PAHs. However, potential risks by PAHs have not been predicted for Korea, and appropriate PAH regulations under climate change have yet...
Article
The urge to increase renewable energy penetration into the power supply mix has been frequently highlighted in response to climate change. South Korea was analyzed as a case study for which the government has shown motivation to increase renewable energy penetration. Herein, a hybrid renewable energy system (HRES) including solar and wind energies...
Article
Microalgae based biofuel has been identified as a promising renewable energy source, which is capable to address the climate change with the replacement of non-renewable energy source that leads to serious environmental impact. Therein, a biorefinery integrated with resource-recovery process which targeting biofuel productivity was designed along w...
Article
Particulate matter with aerodynamic diameter less than 2.5 µm (PM 2.5) has become a major public concern in closed indoor environments, such as subway stations. Forecasting platform PM 2.5 concentrations is significant in developing early warning systems, and regulating ventilation systems to ensure commuter health. However, the performance of exis...
Article
This study presents a novel multi-generation system (MGS) assisted by sugarcane bagasse to produce power, freshwater, and cooling. The proposed integrated MGS consisted of a bagasse-biomass based gasifier-Brayton cycle, a Rankine cycle, a Kalina cycle, an ejector refrigeration cycle, and a multi-effect desalination unit. Comprehensive energy, econo...
Article
Meeting the high current demand for public mobility requires massive transportation systems with their corresponding infrastructures. An example of this is the subway transportation system with underground public commuting space. However, indoor air quality (IAQ) management in this space is challenging due to these environments' hostile conditions...
Conference Paper
Modified Sulphur Iodine cycle and air separation process, and Haber-Bosch process are integrated to produce ammonia and sulphuric acid. Hydrogen and sulphuric acid are produced by Modified Sulphur Iodine cycle. In this study, the economic assessment and Heat Integration were performed on three integrated processes to identify the heat requirement....
Conference Paper
Petrochemical industry in South Korea is currently ranked fifth in production (6.1 %) and forth in exportation (8.3 %) amongst the other sectors. Notably, production capacity of ethylene (9.3 Mt) is ranked fourth in the world according to Korean Petrochemical Industry Association. The petrochemical industrial park encompasses utility networks that...
Article
A two-objective, two-stage mathematical model was developed considering demand uncertainty and operational risk assessment in constructing a utility supply network for steam generation and steam exchange in a petrochemical industrial park. This study defined two objective functions, the total economic cost and risk cost, where the demand uncertaint...
Article
Missing data represents a common problem in environmental and building-related processes, especially in the indoor air quality (IAQ) system of subway stations, where the collected information leads to actions in ventilation management. For these reasons, imputation approaches have been used to avoid information loss due to downsampling or sensor ma...
Article
Passengers are directly or indirectly exposed to fine dust in indoor air of underground subway stations, which greatly affects the comfort and health of the passengers. However, conventional ventilation systems are manually operated, resulting in high energy consumption, and it is hard to consider the dynamic characteristics of indoor air quality d...
Article
In the present study, pinch analysis is extended taking chemical exergy concept into account. The novel chemical exergy pinch analysis is proposed for sustainable power production by an economic application of pressure retarded osmosis membranes in chemical industries. Chemical exergy composite curves and chemical exergy cascade tables are develope...
Article
Full-text available
In the present study, a power, cooling, and freshwater tri-generation system is proposed to meet the global requirements sustainably. A Kalina cycle (KC), an absorption refrigeration cycle (AC), and an organic Rankine cycle (ORC) coupled with reverse osmosis (RO) are integrated to form the proposed system. The performance of the proposed system is...
Article
Renewable and sustainable energy systems and policies have globally been promoted to transition from fossil fuel sources to environmentally friendly renewable energy sources such as wind power, photovoltaic energy, and fuel cells. Wind and solar energy sources are erratic and difficult to implement in renewable energy systems, therefore, circumspec...
Article
A modified sulfur-iodine cycle with a non-nuclear heat source is proposed to enhance the economics and reduce risk and damage to society in terms of cost. A modified sulfur cycle employs a steam boiler as a heat source. The modified sulfur iodine cycle is composed of fewer reactions than the original. Thermodynamic feasibility analysis, economic ev...
Article
Simulation study and validation on 50 L/hr pilot-scale Bunsen process was carried out in order to investigate thermodynamics parameters, suitable reactor type, separator configuration, and the optimal conditions of reactors and separation. Sulfur-Iodine is thermochemical process using iodine and sulfur compounds for producing hydrogen from decompos...
Article
Modern subway transport has become the primary mode of travel for millions of commuters, while indoor air quality (IAQ) in subway stations is becoming a major public health concern. The IAQ management in subway stations is governed by a rule-based ventilation strategy, consisting on the introduction of fresh air from outside. However, this strategy...
Article
Indoor air quality (IAQ) measurements play an important role in the subway ventilation system control, influencing over crucial factors as ventilation energy consumption and commuters’ health. Therefore, faulty sensors may result in misinterpreting the IAQ conditions and misoperating the air delivery rate level in subway stations. However, due to t...
Article
Full-text available
Optimal operation of membrane bioreactor (MBR) plants is a crucial factor to save operational costs while satisfying legal effluent discharge requirements. The aeration process of the MBR plants tends to use excessive energy for supplying air to microorganisms among the treating processes. In the present study, a novel optimal aeration system is pr...
Article
With the advent of the industry 4.0 and the introduction of smart technologies in wastewater treatment plants (WWTP); forecasting influent loads is essential to regulate exaggerated operational strategies for WWTP. However, due to various water usage and sources, it is challenging to forecast the fluctuating influent loads. To deal with highly nonl...
Article
Two novel solar buses are proposed to mitigate climate change in urban settings. Operational problems of solar power harnessing in cities such as high land costs and dust accumulation on the panels are obviated by installing solar panels on the otherwise rooftop area of the urban buses. Furthermore, the fuel consumption and hazardous emissions of b...
Article
This study aims to integrate central utility systems in a large petrochemical industry with adjoining waste-to-energy networks to form an eco-friendly energy management system. The waste-to-energy networks studied in this contribution include the following main systems: (1) wastewater treatment plants for biogas production, (2) a biogas upgrading p...
Article
Endangered species ecosystems require appropriate monitoring for assessing population growth related to the emerging pollutants in their habitat conditions. The response of population growth of Cobitis choii, an endangered fish species, under the exposure to emerging pollutants present in the Geum River Basin of South Korea was studied. Toxicity mo...
Article
Renewable energy resources have become important to strategies for meeting industrial demands for power due to their various benefits when coupled with government incentives and public support. To obtain a reasonable compromise between capital investment costs and system reliability, a method of determining the optimal size of hybrid renewable ener...
Article
This study proposed a novel practical framework to assess the reliability and resilience of a wastewater treatment plant (WWTP). Such assessment is further extended to enhance the system performance with various scenarios based on fault tree analysis (FTA). Coefficient of reliability (COR) and performance curves of the resilience assessment are de...
Conference Paper
Full-text available
Process Integration has become a mature efficient tool for optimal design of engineering systems. Accordingly, a novel combined steam power plant and steam jet heat pump is proposed in order to minimize the water losses in the coupled natural draft wet cooling tower as the cold utility to tackle climate changes. Thermodynamic and economic models of...
Article
A novel smart management approach is proposed for optimization, management, and analysis of integrated energy systems considering contemporary economic, safety, and environmental policies referred to as 3M methodology. Accordingly, three key scenarios are defined including an urban plant application (S-I), a domestic economic growth policy (S-II),...
Article
A holistic analytical approach is proposed to study the performance of fossil fuel burning integrated energy conversion systems considering energetic, economic, exergetic, environmental and risk (4ER) aspects in a framework. For this, life cycle assessment is conducted to study environmental impacts while other analyses are performed using the alge...
Article
Mechanical ventilation has been widely implemented to alleviate poor indoor air quality (IAQ) in confined underground public facilities. However, due to time-varying IAQ properties that are influenced by unpredictable factors, including outdoor air quality, subway schedules, and passenger volumes, real-time control that incorporates a trade-off bet...
Article
Sensors providing measurements for monitoring and control of indoor air quality (IAQ) are key components of the ventilation systems in subway stations. However, faulty sensors due to harsh ambient conditions may deliver incorrect information triggering misinterpretation; causing energy waste or IAQ deterioration. This paper presents a holistic onli...
Article
Over 80,000 endocrine-disrupting chemicals (EDCs) are considered emerging contaminants (ECs), which are of great concern due to their effects on human health. Quantitative structure-activity relationship (QSAR) models are a promising alternative to in vitro methods to predict the toxicological effects of chemicals on human health. In this study, we...
Article
Full-text available
Detection and isolation of burst locations in water distribution networks (WDN) are challenging problems in urban management because burst events cause considerable economic, social, and environmental losses. In the present study, a novel monitoring and sensor placement approach is proposed for rapid and robust burst detection. Accordingly, a hybri...
Poster
Full-text available
water-exergy nexus
Article
Renewable energy systems coupled with reverse osmosis (RO) desalination represent a great contribution to the fields of energy and sustainability. Especially in remote areas, where reliability issues associated with integrated systems result in problems of insufficient power supply or supply loss due to the intermittency of renewable sources and va...
Article
Dengue fever, a vector-borne disease, represents a priority public health problem in Ecuador. Previous studies indicated that the ecology of the transmitter vector (Aedes aegypti) is influenced by environmental parameters and human behavior; however, the effects of those variables on mosquito population dynamics depend on local environmental featur...
Article
Indoor air quality (IAQ) in subway stations are dynamic due to various time-dependent factors, such as subway schedule, passenger load variance in short time scale, and outdoor air quality variation cause from climate change. To remove the indoor pollutants, a conventional mechanical ventilation system is typically utilized in subway stations; howe...