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( Mahfud Mahfud ),( Andi Suryanto ),( Lailatul Qadariyah ),( Suprapto Suprapto ),( Heri Septya Kusuma ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.2
Methyl ester derived from coconut oil is very interesting to study since it contains free-fatty acid with chemical structure of medium carbon chain (C<sub>12</sub>-C<sub>14</sub>), so the methyl ester obtained from its part can be a biodiesel and another partially into biokerosene. The use of heterogeneous catalysts in the production of methyl ester requires severe conditions (high pressure and high temperature), while at low temperature and atmospheric conditions, yield of methyl ester is relatively very low. By using microwave irradiation trans-esterification reaction with heterogeneous catalysts, it is expected to be much faster and can give higher yields. Therefore, we studied the production of methyl ester from coconut oil using CaO catalyst assisted by microwave. Our aim was to find a kinetic model of methyl ester production through a transesterification process from coconut oil assisted by microwave using heterogeneous CaO catalyst. The experimental apparatus consisted of a batch reactor placed in a microwave oven equipped with a condenser, stirrer and temperature controllers. Batch process was conducted at atmospheric pressure with a variation of CaO catalyst concentration (0.5; 1.0; 1.5; 2.0, 2.5%) and microwave power (100, 264 and 400 W). In general, the production process of methyl esters by heterogeneous catalyst will obtain three layers, wherein the first layer is the product of methyl ester, the second layer is glycerol and the third layer is the catalyst. The experimental results show that the yield of methyl ester increases along with the increase of microwave power, catalyst concentration and reaction time. Kinetic model of methyl ester production can be represented by the following equation: -r<sub>TG</sub> = 1.7·10<sup>6</sup><sub>e</sub>-43.86/RT C<sub>TG</sub>.
Handling Imbalanced Data Using a Cascade Model for Image-Based Human Action Recognition
Wahyono,Suprapto,Adam Rezky,Nur Rokhman,Kang-Hyun Jo 한국정보과학회 2023 Journal of Computing Science and Engineering Vol.17 No.4
Human action recognition plays a crucial role in intelligent monitoring systems, which are based on analyzing the possibility of anomalous events related to human behavior, such as theft, fights, and other incidents. However, by definition, anomalous events occur somewhat infrequently, thus leading to small and unbalanced data compared to data on other events. Such a data imbalance causes the human action recognition model to fail to produce optimal accuracy. To overcome the problem of imbalanced data, the typical methods used are oversampling and undersampling. However, these two methods are not considered to be very effective, because they cause the loss of a significant amount of information or deviations from reality. Therefore, the current paper proposes a cascade modeling strategy to address data imbalance problems, particularly in the case of human action recognition. The proposed strategy consists of several steps: preprocessing, feature extraction, modeling, and evaluation. The BAR dataset experiment found that the cascade model outperformed the other examined methods with an accuracy of 56.38%. However, there is still potential for further improvement through continued research.
Msc,Fpe,Suprapto,Rahardja,Nugraha-B 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-
Following the ratification of Vienna Convention for Ozone Layer Protection and Montreal Protocol, Indonesia will implement the phasing-out of to halon at end 1996. Questions are increasing especially from the users where halon has used for many years as the most effective fire extinguishing agent, concerning halon substitutes, alternative systems as well as the handling and utilization of the existing halon. Halon can still be used for critical and essential uses, however, such usage has been gradually eliminated, due to the emergence of halon-like replacement. A concept of halon banking system is proposed to considered, taking into account several aspects such as enforced regulation, institutional involvement technology as well as financing. This paper gives a general overview regarding phase-out implementation, alternative extinguishing systems and concept on halon banking system with special reference to Indonesian case.
Jimmy,Achmad Roesyadi,Suprapto,Firman Kurniawansyah 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.1
Synthesis of Fe-Co/meso-HZSM5 catalyst, intended to be applied in Fischer-Tropsch (FT) reaction was investigated. The study emphasized the effect of desilication agents, NaOH and KOH, on the catalyst materials properties. Impregnation composition of active metal (Fe and Co) was also examined. HZSM-5, converted from ammonium ZSM-5 through calcination, was treated with NaOH and KOH for desilication, followed by impregnation with 10% metal loading. Fe composition in the initial mixture was varied at 10-50% from total composition. After impregnation, reduction was applied by flowing hydrogen gas at 400 oC for 10 hours. The use of KOH solution induced greater mesoporous volumes; however, it had a detrimental effect on zeolite crystal structure. NaOH solutions, on the other hand, increased mesopore area as high as 100%, indicated from surface area increase from 266.28 m2/g of HZSM-5, to 526.03 m2/g of NaOHdesilicated HZSM-5. In addition, the application of NaOH solution increased pore volume from 0.14 cc/g to 0.486 cc/g. Further, more Fe-Co alloys and less oxide of iron (Fe2O3) as well cobalt (Co3O4) had been commonly observed in the produced catalysts. The largest Fe-Co alloys could be found in 50Fe-50Co/HZSM-5.
An Alternative Athlete Monitoring System Using Cost-Effective Inertial Sensing Instrumentation
Mudeng Vicky,Hakim Imam M.,Suprapto Sena S.,Choe Se-woon 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
An examination of the human gait is feasible using inertial sensing. The embedded accelerometer and gyroscope in an inertial measurement unit can evaluate physical activity-based sports and this unit is relatively aff ordable compared to global positioning systems or video recording quantifi cation. This study developed a cost-eff ective sports monitoring investigation method with an inertial sensor attached to the right leg of the athletes. In total, four parameters were simultaneously tracked to assess the entire sensor performance in real-time. The accelerometer measured the typical leg angle when walking and running, whereas the gyroscope processed the raw data to obtain the stride frequency from the time-domain data. Moreover, a comparison between the accelerometer and gyroscope was presented while simultaneously attaining the signal to convert the time-domain data to frequency results. Also, the number of strides and linear velocity was expressed as results in this study. To confi rm the results, a statistical hypothesis test was implemented for all obtained results. The results indicated that the inertial sensing instrumentation used in this study is promising and could be an aff ordable alternative option for a sports monitoring system.
Han, Ah-Reum,Min, Hye-Young,Nam, Joo-Won,Lee, Na-Youn,Wiryawan, Adam,Suprapto, Wahyu,Lee, Sang Kook,Lee, Kang Ro,Seo, Eun-Kyoung The Pharmaceutical Society of Japan 2008 Chemical & pharmaceutical bulletin Vol.56 No.9
<P>A new naphthoquinone, (−)-3-[2-(acetyloxy)propyl]-2-hydroxy-8-methoxy-1,4-naphthoquinone (1) was isolated from the bulb of <I>Eleutherine americana</I> M<SMALL>ERR</SMALL>. <I>et</I> H<SMALL>EYNE</SMALL> (Iridaceae) together with two known compounds, eleutherinol (6) and 1,5-dihydroxy-3-methylanthraquinone (7) which were found in this species for the first time. The other known compounds, (−)-isoeleutherin (2), (+)-eleutherin (3), (−)-hongconin (4), and (+)-dihydroeleutherinol (5) which were reported previously from this species, were also isolated in the present study. Compounds 2—6 exhibited potent inhibitory activity on nitric oxide production in RAW 264.7 lipopolysaccharide-activated mouse macrophage cells with IC<SUB>50</SUB> values of 7.7, 11.4, 19.8, 21.7, and 34.4 μ<SMALL>M</SMALL>, respectively, whereas the other two compounds, 1 and 7, were inactive. The structure of compound 1 was elucidated by spectroscopic data analysis including 1D and 2D NMR experiments.</P>
Identification of a New Cytotoxic Biflavanone from Selaginella doederleinii
LEE, Na-Youn,MIN, Hye-Young,LEE, Jun,NAM, Joo-Won,LEE, Yoo-Jin,HAN, Ah-Reum,Adam WIRYAWAN,Wahyu SUPRAPTO,LEE, Sang Kook,SEO, Eun-Kyoung 이화여자대학교 약학연구소 2009 藥學硏究論文集 Vol.- No.19
A new biflavanone, 2,2˝,3,3˝-tetrahydrorobustaflavone 7,4´,7˝-trimethyl ether (1) was isolated from the whole plant of Selaginella doederleinii H_(IERON). (Selaginellaceae) together with the known biflavonoid, robustaflavone 7,4´,7˝-trimethyl ether (2) as the cytotoxic constituents against the three human cancer cell lines, HCT, NCI-H358, and K562. The structure of the new compound 1 was elucidated by spectral analysis including various 1D- and 2D-NMR experiments.