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Gonzales, Ralph Rolly,Kim, Jun Seok,Kim, Sang-Hyoun Elsevier 2019 International journal of hydrogen energy Vol.44 No.4
<P><B>Abstract</B></P> <P>Pretreatment of the empty fruit brunch (EFB) from oil palm was investigated for H<SUB>2</SUB> fermentation. The EFB was hydrolyzed at various temperatures, H<SUB>2</SUB>SO<SUB>4</SUB> concentrations, and reaction times. Subsequently, the acid-hydrolysate underwent enzymatic saccharification under various temperature, pH, and enzymatic loading conditions. Response surface methodology derived the optimum sugar concentration (SC), hydrogen production rate (HPR), and hydrogen yield (HY) as 28.30 g L<SUP>−1</SUP>, 2601.24 mL H<SUB>2</SUB> L<SUP>−1</SUP>d<SUP>−1</SUP>, and 275.75 mL H<SUB>2</SUB> g<SUP>−1</SUP> total sugar (TS), respectively, at 120 °C, 60 min of reaction, and 6 vol% H<SUB>2</SUB>SO<SUB>4</SUB>, with the combined severity factor of 1.75. Enzymatic hydrolysis enhanced the SC, HY, and HPR to 34.52 g L<SUP>−1</SUP>, 283.91 mL H<SUB>2</SUB> g<SUP>−1</SUP> TS, and 3266.86 mL H<SUB>2</SUB> L<SUP>−1</SUP>d<SUP>−1</SUP>, respectively, at 45 °C, pH 5.0, and 1.17 mg enzyme mL<SUP>−1</SUP>. Dilute acid hydrolysis would be a viable pretreatment for biohydrogen production from EFB. Subsequent enzymatic hydrolysis can be performed if enhanced HPR is required.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dilute acid and enzymatic hydrolysis were optimized for oil palm empty fruit bunch. </LI> <LI> Response surface methodology was used for optimization of pretreatment. </LI> <LI> Dilute acid hydrolysis effectively pretreated the biomass for H<SUB>2</SUB> fermentation. </LI> <LI> Subsequent enzymatic saccharification enhanced H<SUB>2</SUB> production rate. </LI> </UL> </P>
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Gonzales, R.R.,Sivagurunathan, P.,Parthiban, A.,Kim, S.H. Elsevier Applied Science 2016 INTERNATIONAL BIODETERIORATION AND BIODEGRADATION Vol.113 No.-
Lignocellulosic biomass is a promising alternative source for biohydrogen production. Its recalcitrant structure requires physicochemical pretreatment methods, such as dilute acid pretreatment, to utilize the carbohydrates in the biomass for fermentation. This study was aimed to investigate the optimum substrate concentration of dilute acid lignocellulosic hydrolyzate for dark hydrogen fermentation processes. Empty palm fruit bunch, rice husk, and pine tree wood were used as the substrates. The lignocellulosic biomass samples were hydrolyzed and fed to batch hydrogen fermentation after adjustment of substrate concentration of the hydrolyzate solutions to 5, 10, 15, and 20 g/L. The maximum hydrogen production rates were 1510 +/- 96 mL H<SUB>2</SUB> L<SUP>-1</SUP> day<SUP>-1</SUP>, 1860 +/- 245 mL H<SUB>2</SUB> L<SUP>-1</SUP> day<SUP>-1</SUP>, and 1629 +/- 170 mL H<SUB>2</SUB> L<SUP>-1</SUP> day<SUP>-1</SUP> at 10 g L<SUP>-1</SUP> substrate concentration of empty palm fruit bunch, rice husk, and pine tree wood, respectively. These correspond to hydrogen yields of 0.96 +/- 0.04 mol H<SUB>2</SUB> mol<SUP>-1</SUP> sugar, 1.25 +/- 0.15 mL H<SUB>2</SUB> mol<SUP>-1</SUP> sugar, and 0.99 +/- 0.05 mL H<SUB>2</SUB> mol<SUP>-1</SUP> sugar, respectively. The results indicate that dilute acid pretreated lignocellulosic biomass would be a suitable substrate for fermentative hydrogen production.
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Gonzales, Ralph Rolly,Kumar, Gopalakrishnan,Sivagurunathan, Periyasamy,Kim, Sang-Hyoun Elsevier 2017 International journal of hydrogen energy Vol.42 No.45
<P><B>Abstract</B></P> <P>Biorefinery is the integration of various conversion and separation unit processes of biomass to energy, among other products. Downstream processes link these unit processes; however, these are often overlooked to affect energy yield. In this study, use of different alkaline agents and separation techniques, and order of operations, was assessed after conversion of processed sugar into hydrogen through dark fermentation. pH was adjusted to pH 6 using various basic agents; and vacuum filtration and centrifugation were performed to facilitate separation. Sugar loss of 7–40% due to the downstream processes was recorded; however, optimization of the processes ensured high volume and sugar recovery and low degradation byproduct production. Satisfactory volume recovery with high sugar and low byproduct concentrations were achieved after vacuum filtration and pH adjustment with aqueous base. H<SUB>2</SUB> yield and production rate significantly increased after performing the downstream processes. Peak H<SUB>2</SUB> production rate and yield were 1824 mL H<SUB>2</SUB> L<SUP>−1</SUP> d<SUP>−1</SUP> and 1.27 mol H<SUB>2</SUB> mol<SUP>−1</SUP> sugar, respectively, for the optimum condition of vacuum filtration, followed by pH adjustment using 8 N Ca(OH)<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dilute acid pretreated pine tree wood was tested for neutralization and fractionation. </LI> <LI> Treated hydrolyzates were used as substrates for biohydrogen production. </LI> <LI> Filtration then neutralization with aqueous base is the best treatment method. </LI> </UL> </P>
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Supplementation of Korean Red Ginseng improves behavior deviations in animal models of autism
Gonzales, Edson Luck T.,Jang, Jong-Hwa,Mabunga, Darine Froy N.,Kim, Ji-Woon,Ko, Mee Jung,Cho, Kyu Suk,Bahn, Geon Ho,Hong, Minha,Ryu, Jong Hoon,Kim, Hee Jin,Cheong, Jae Hoon,Shin, Chan Young Co-Action Publishing 2016 Food & nutrition research Vol.60 No.-
<P><B>Background</B></P><P>Autism spectrum disorder (ASD) is heterogeneous neurodevelopmental disorders that primarily display social and communication impairments and restricted/repetitive behaviors. ASD prevalence has increased in recent years, yet very limited therapeutic targets and treatments are available to counteract the incapacitating disorder. Korean Red Ginseng (KRG) is a popular herbal plant in South Korea known for its wide range of therapeutic effects and nutritional benefits and has recently been gaining great scientific attention, particularly for its positive effects in the central nervous system.</P><P><B>Objectives</B></P><P>Thus, in this study, we investigated the therapeutic potential of KRG in alleviating the neurobehavioral deficits found in the valproic acid (VPA)-exposed mice models of ASD.</P><P><B>Design</B></P><P>Starting at 21 days old (P21), VPA-exposed mice were given daily oral administrations of KRG solution (100 or 200 mg/kg) until the termination of all experiments. From P28, mice behaviors were assessed in terms of social interaction capacity (P28–29), locomotor activity (P30), repetitive behaviors (P32), short-term spatial working memory (P34), motor coordination (P36), and seizure susceptibility (P38).</P><P><B>Results</B></P><P>VPA-exposed mice showed sociability and social novelty preference deficits, hyperactivity, increased repetitive behavior, impaired spatial working memory, slightly affected motor coordination, and high seizure susceptibility. Remarkably, long-term KRG treatment in both dosages normalized all the ASD-related behaviors in VPA-exposed mice, except motor coordination ability.</P><P><B>Conclusion</B></P><P>As a food and herbal supplement with various known benefits, KRG demonstrated its therapeutic potential in rescuing abnormal behaviors related to autism caused by prenatal environmental exposure to VPA.</P>
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Gonzales, R.R.,Sivagurunathan, P.,Kim, S.H. Pergamon Press 2016 International journal of hydrogen energy Vol.41 No.46
<P>This study aimed to investigate the relationship of the severity of dilute acid pretreatment and the following dark hydrogen fermentation performance. Empty palm fruit bunch, rice husk, and pine tree wood were hydrolyzed in 5% (v/v) H2SO4 at 10% (w/v) solid/liquid ratio and 121 degrees C for 30, 60, and 90 min, and then used as the substrate of batch hydrogen fermentation. The maximum sugar yield was achieved at pretreatment with 60 min reaction time; however, it did not guarantee the maximum H-2 production. Hydrolyzate obtained from pretreatment where the combined severity factor was at or over 2.01 showed severe 5-hydroxymethylfurfural production and consequent decrease of H-2 production rate. Peak H-2 production rates of 2640, 3340, and 2565 mL H-2 L-1 day(-1) were achieved at the following severity factors: 1.95, 1.86, and 1.83, for empty palm fruit bunch, rice husk, and pine tree wood, respectively. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
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Class Association Rule Mining with Correlation Measuresusing Genetic Network Programming
Eloy Gonzales,Shingo Mabu,Karla Taboada,Kaoru Shimada,Kotaro Hirasawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Association rule mining is one of the tasks of datamining and it has been extensively studied recently. As a consequence, several methods for extractin gas sociation rules have been developed during the last years. Most of the muse the supportand confidence framework to extract the association rules. Researches are able to extract strong rules using this framework. However these measures are not good enough to solve the quality problems of the rules. A new data mining method using Genetic Network Programming(GNP) has also been developed recently which uses the χ<SUP>2</SUP> (chi-squared) as a correlation measure and its effectiveness has been shown for different data sets[1][2]. To enhance the correlation degree and comprehensibility of association rule, several correlation measures including lift, χ<SUP>2</SUP>, all-confidence and cosineare studied in this paper when they are in corporated in the conventional GNP based mining algorithm. A comparison between the correlation measures is made in the simulations when they are incorporated separately in to the GNP based mining method. Finally, the association rules extracted using different correlation measures are applied to the classification problems and the prediction accuracies of them are evaluated.
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Hector Gonzales,Diego Costa Pinto,Rafael Luis Wagner,Khaoula Kadmin 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
This paper investigates how the use of artificial intelligence (AI) in services may potentially have a negative impact on consumer wellbeing due to the fear of being replaced by AI. Drawing on temporal self-appraisal theory, the study proposes that the fear of being replaced by an AI agent (as opposed to a human) has a negative effect on consumers' psychological wellbeing. The research suggests that this fear negatively affects consumers' perceptions of self-continuity, and that self-continuity perceptions mediate the relationship between fear of AI replacement and psychological wellbeing. Furthermore, the study explores how the type of task intelligence replaced by AI, whether thinking or feeling tasks, moderates the effects of AI on self-continuity and wellbeing.
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( Joseph Gonzales ) 대한무용학회 2016 대한무용학회논문집 Vol.74 No.6
This paper documents the efforts to propagate the traditional theatre form Makyung through the system of education at the National Academy of Arts, Culture and Heritage Malaysia. Beyond the educational institution, several individuals have becom e key players in the landscape of performing arts in Malaysia through organizations they have established or through the agency of the state. The arts workers have realized that merely preserving traditional theatre as a cultural artefact makes it merely an object of curiosity. These individuals have successfully brought Makyung to new public urban sites through innovations within the genre, keeping it relevant to contemporary society.
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