Dongho Park’s research while affiliated with Korea Institute of Industrial Technology and other places

... Ji et al. [8] developed a deep neural network (DNN) model to predict hot water heating energy consumption in apartment buildings considering various independent variables; their model considering holidays as well as climatic factors achieved the best predictive performance, followed by a model considering climatic factors and one considering outdoor temperatures. Kim et al. [9] utilized Multi Linear Regression (MLR) and the Multilayer Perceptron (MLP), Support Vector Machine (SVM), and Random Forest (RF) algorithms to predict the electricity consumption of buildings, addressing temporal resolution and comparing algorithms to improve predictive accuracy. ...

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Predicting Liquid Natural Gas Consumption via the Multilayer Perceptron Algorithm Using Bayesian Hyperparameter Autotuning

... However, oil and natural gas reservoirs are finite and will eventually be exhausted. Moreover, the extensive utilization of non-renewable resources will worsen the global warming crisis [1,2]. Consequently, effectively leveraging the presently available resources has emerged as a crucial concern. ...

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Magnetic Phase-Change Microcapsules with High Encapsulation Efficiency, Enhancement of Infrared Stealth, and Thermal Stability

... The distributed building heating system with 17 storage units provided nearly half of the heat required to meet the total demand with an operational cost of 0.371 RMB (5.2 US cents) per kWh. In a similar study, Lee et al. [194] investigated the load shifting capability of a 244.8Mcal PCM TES unit in a district heating network to meet the daily hot water demand of >126 homes in South Korea. ...

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Phase change materials in building integrated space heating and domestic hot water applications: A review

... The traditional preparation techniques for feedstock powder include the sol-gel method [59], high-temperature melting method [60], templating method [61,62], spray drying method [63], etc. Figure 5 shows the various shapes of spraying feedstock powder produced via different traditional preparation techniques [64]. Although the feedstock powder melt into spheres during ...

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Engineering design of feedstock powder and relevant thermal–mechanical performance of thermal/environmental barrier coatings

... An attempt to obtain Al nanoparticles with an average size of 196 nm using micro-electrical discharge in polyethylene glycol stabilizer has been reported [21]. A sharp distribution of the nanoparticles has been achieved for alumina nanoparticles via the application of a thermophoretic separator [22]. In general, different experimental techniques have been developed to control the size of the metal nanoparticles, e.g. ...

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Thermodynamic analysis of Al clusters formation over aluminum melt

... However, with dramatic expanding of the thermal plasma application fields, specific requirements on the plasma parameters, including the maximum values and spatial distributions of the gas temperatures, electron temperatures, and species number densities, become more and more important. For example, in the nanoparticle syntheses using thermal plasmas, on the one hand, a high-temperature plasma region is necessary to heat and evaporate the precursors quickly; while on the other hand, a steep heavy-particle temperature gradient is required to ensure that the evaporated materials enter the low-temperature plasma region rapidly, thus, the time to form nanoparticles through nucleation and condensation is shortened, and the excessive particle agglomeration is avoided accompanied by the increase of the production rate and the particle size uniformity [1,[6][7][8]. This means that the coexistence of the regions with high and low gas temperatures, steep gas temperature gradients and high chemical reactivity is indispensable for balancing the production rate, particle size and its distribution during the synthesis of nanoparticles. ...

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Production of a large volume non-equilibrium region in an atmospheric argon arc plasma with a counter injection of cold gas from an annular anode

... The electrical low-pressure cascade impactor was developed further for achieving higher resolution with 100 or 500 size fractions (i.e. HR-ELPI+) (Saari S. et al., 2018) or measuring nanoparticle mass concentration using a wire-to-rode corona charger to eliminate the new particle formation which may occur in the pin-to-plate corona charger (Han J. et al., 2018). ...

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Inertial Impaction Technique for the Classification of Particulate Matters and Nanoparticles: A Review

... However, the operating conditions strongly affected the ρ e I values, with ρ e I varying from 0.9 g cm −3 at condition 5 to 0.3 g cm −3 at condition 3 at 85 nm, for example. Hyun et al. (2015) presented a modified setup consisting of a DMA and a single-stage low-pressure impactor (SELPI) to obtain D m and D a . The difference between the DMA-ELPI and DMA-SELPI setup is that the D a of the particles in the latter case is obtained through the relationship between D a and the collection efficiency (η) of the SELPI. ...

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A review of measurement techniques for aerosol effective density

... The controlled morphology provided several pathways for the analyte to diffuse and the electrochemical reaction takes place throughout the porous electrode surface. The nanofabrication through conventional lithography is a complex, expensive and timeconsuming process [77]. ...

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Electrodes modified with 3D graphene composites: a review on methods for preparation, properties and sensing applications

... Chua et al. (2009) microfabricated an ionizer with a discharging gap distance of 1.1 mm and combined it with a separator. Park et al. (2010) and Lee et al. (2011) fabricated a chip-type charger whose sharp silicon tip was made using MEMS process. Together with a micro virtual impactor, this charger could be assembled into a particle detection chip (Kim et al. 2008). ...

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Charging efficiency of nanoparticles in needle-to-plate chargers with micro discharge gaps