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Asymmetric Reduction of 3-Ketoproline Ethyl Ester by Modified Borohydrides and Various Vegetables
Wibowo, Agustono,Shaameri, Zurina,Mohammat, Mohd Fazli,Hamzah, Ahmad Sazali Korean Chemical Society 2017 대한화학회지 Vol.61 No.5
Reduction of (${\pm}$)-3-ketoproline ethyl ester (1) by $NaBH_4$ in the presence of $CaCl_2$ and $MgCl_2$ as the chelating agents gave selective products cis-3(R/S)-alcohols, while reduction by $NaBH_4$ alone or chelated with $NiCl_2$ and $AlBr_3$ gave mixtures of cis- and trans-alcohols. The reduction of (${\pm}$)-1 by various vegetables however, gave exclusively the cis-alcohol as the major and trans-alcohol as the minor. On the contrary, reduction of (${\pm}$)-1 by carrot afforded a mixture of cis- and trans-alcohols, in which the trans-alcohol exists as the major product. In addition, we found that this biocatalyst selectively converted S-enantiomer of (${\pm}$)-1 to the cis-alcohol, and R-enantiomer to a mixture of cis- and trans-alcohols with cis-alcohol as the major product. This fact prompted us to use various fresh plant tissues for stereoselective reduction of diverse types of pyrrolidinones, as its stereoselectivity towards racemic mixtures is higher compared to that using chemical reducing agents.
Wibowo, Rachmat Adhi,Alfaruqi, Muhammad H.,Jung, Woon-Hwa,Kim, Kyoo-Ho 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Commercially available elemental powders of Cu, Zn, Sn and Se were employed for crystallizing a stannite-type Cu₂ZnSnSe₄ compound by means of solid state reaction. Cu₂ZnSnSe₄ reaction chemistry was also modeled based on differential-thermal analysis and X-ray powder diffraction results. It was observed that Se tends to react preferably with Cu to form CuSe and CuSe₂ phases at low reaction temperature. The formation of Cu<sub>5</sub>Zn_8 intermetallic phase was found to be the intermediate reaction path for the binary ZnSe formation. A solid state reaction at 320?C reacted elemental powderst obinary selenides of CuSe, ZnSe and SnSe completely. The crystallization of Cu₂ZnSnSe₄ was was detected to begin at 300?C and its weight fraction increased with an increase of reaction temperature, which most probably formed from the reaction between Cu₂SnSe₃ and ZnSe.
WIBOWO, Eko Setio,PARK, Byung-Dae,CAUSIN, Valerio,HAHN, Dongyup The Korean Society of Wood ScienceTechnology 2022 목재공학 Vol.50 No.5
The crystalline domain of thermosetting urea-formaldehyde (UF) resins at low formaldehyde-to-urea (F/U) molar ratios (≤ 1.0) is known to be responsible for their poor performance as wood adhesives. Crystallization has been observed in 1.0 F/U UF resins during the addition reaction stage and at the end of the synthesis process (neat UF resins). The crystallinity and X-ray diffraction (XRD) spectra of the uncured neat UF resins, on the other hand, differed significantly from those of the cured neat UF resins, raising the possibility that their crystal structures were also different. This study demonstrates for the first time that the crystalline domains in 1.0 F/U UF resins generated from uncured and cured samples are identical. Despite having a lower crystallinity value, the synchrotron XRD patterns of purified neat UF resins were equivalent to the XRD patterns of cured neat UF resins. Transmission electron microscope images of the cured UF resins showed that the crystals were lamellar structures. This finding suggests that the crystal at low molar ratio UF resins are isotropic polycrystals with random orientation.
Occurrence of Tropical Race 4 of Fusarium oxysporum f. sp. cubense in Indonesia
Wibowo, A.,Subandiyah, S.,Sumardiyono, C.,Sulistyowati, L.,Taylor, P.,Fegan, M. The Korean Society of Plant Pathology 2011 Plant Pathology Journal Vol.27 No.3
Fusarium wilt of banana caused by Fusarium oxysporum f. sp. cubense is widespread in Indonesia. However, the distribution of tropical race 4 strains has not been well studied. Thirty nine isolates of F. oxysporum f. sp. cubense were collected from Java and 7 isolates were from Sumatera, Bangka, and Kalimantan. All isolates produced volatile odor when grown on steamed rice. These isolates were further tested for their vegetative compatibility with nitM testers of 20 reported vegetative compatibility groups representing strains that belong to race 1, 2, and 4. Three isolates formed heterokaryons with nitM testers belong to race 1, 11 isolates with race 4, and the rest did not form heterokaryons with all nitM testers used. F. oxysporum f. sp. cubense tropical race 4 specific primer pair was used to amplify a 1400 bp fragment of tropical race 4 DNA. Seven isolates (Bnt2, Mln1, Srg1, Bgl3, Bgl6, Lmp1, and Kjg1) produced the 1400 bp amplification product were therefore tropical race 4.
Discrete Wavelet Transform for Watermarking Three-Dimensional Triangular Meshes from a Kinect Sensor
Wibowo, Suryo Adhi,Kim, Eun Kyeong,Kim, Sungshin Korean Institute of Intelligent Systems 2014 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.14 No.4
We present a simple method to watermark three-dimensional (3D) triangular meshes that have been generated from the depth data of the Kinect sensor. In contrast to previous methods, which maintain the shape of 3D triangular meshes and decide the embedding place, requiring calculations of vertices and their neighbors, our method is based on selecting one of the coordinate axes. To maintain shape, we use discrete wavelet transform and constant regularization. We know that the watermarking system needs the information to be embedded; we used a text to provide that information. We used geometry attacks such as rotation, scales, and translation, to test the performance of this watermarking system. Performance parameters in this paper include the vertices error rate (VER) and bit error rate (BER). The results from the VER and BER indicate that using a correction term before the extraction process makes our system robust to geometry attacks.
Factors Determining Intention to Use Banking Technology in Indonesian Islamic Microfinance
WIBOWO, Kartiko Adi,ISMAIL, Abdul Ghafar,TOHIRIN, Achmad,SRIYANA, Jaka Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12
This study aims to determine the perceptions of Islamic Financial Cooperative (BMT) managers in the Indonesian BMT Association on the acceptance of core banking technology. The Technology Acceptance Model (TAM) is used because it has simple theoretical characteristics (parsimony) and is supported by data (verifiability). This study develops the TAM model by integrating new variables -perceptions of maqashid sharia, perceptions of economies of scale, perceptions of market structure, and perceptions of technology procurement costs. These new variables are used to measure intention in using technology and actual usage in BMT operations. This study used PLS-SEM with smartPLS 3. The study was conducted in Central Java in six ex-Residency at 35 BMT with 300 respondents consisting of six levels of position level. The research found that maqashid sharia and market structure directly influenced the intention of BMT managers in using core banking technology. This new finding strengthens a theoretical model regarding the role of maqashid sharia in the acceptance of information technology in BMT. In addition, the perception of economies of scale has no significant effect on intention in using technology or its actual usage. The perception variable of technology procurement costs was found to have no significant effect on intention in using technology.
Three-Dimensional Face Point Cloud Smoothing Based on Modified Anisotropic Diffusion Method
Wibowo, Suryo Adhi,Kim, Sungshin Korean Institute of Intelligent Systems 2014 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.14 No.2
This paper presents the results of three-dimensional face point cloud smoothing based on a modified anisotropic diffusion method. The focus of this research was to obtain a 3D face point cloud with a smooth texture and number of vertices equal to the number of vertices input during the smoothing process. Different from other methods, such as using a template D face model, modified anisotropic diffusion only uses basic concepts of convolution and filtering which do not require a complex process. In this research, we used 6D point cloud face data where the first 3D point cloud contained data pertaining to noisy x-, y-, and z-coordinate information, and the other 3D point cloud contained data regarding the red, green, and blue pixel layers as an input system. We used vertex selection to modify the original anisotropic diffusion. The results show that our method has improved performance relative to the original anisotropic diffusion method.
Factors associated with side effects of COVID-19 vaccine in Indonesia
Johan Wibowo,Rivaldo Steven Heriyanto,Felix Wijovi,Devina Adella Halim,Claudia Claudia,Elizabeth Marcella,Billy Susanto,Michele Indrawan,Nadia Khoirunnisa Heryadi,Michelle Imanuelly,Jonathan Juniard A 대한백신학회 2022 Clinical and Experimental Vaccine Research Vol.11 No.1
Purpose: As coronavirus disease 2019 (COVID-19) continues to spread rapidly causing approximately 186 million confirmed cases around the world, the urgency to reach herd immunity through vaccination is increasing. However, vaccine safety is a top priority to limit the occurrence of adverse events. Henceforth, this study aims to recognize and perceive COVID-19 vaccine safety in Indonesia during the pandemic. Materials and Methods: This is a cross-sectional study and was conducted in Indonesia during the COVID-19 pandemic using an online survey of demographic information and a qualitative questionnaire. Responses were recorded and the association between demographic characteristics from survey questions was tested using chi-square with a risk estimate and 95% confidence interval. Results: A total of 311 participants from 33 out of 34 provinces in Indonesia participated in this study. Recorded responses showed multiple side effects of the COVID-19 vaccine both shortand long-term experienced by the participants. Significant associations were found between demographic factors and COVID-19 vaccine side effects such as female gender with shortterm puncture site (odds ratio [OR], 0.463; 95% confidence interval [CI], 0.263–0.816) and shortterm other reactions (OR, 0.463; 95% CI, 0.263–0.816), domicile outside Java island with longterm puncture site (OR, 4.219; 95% CI, 1.401–12.701) and immune reactions (OR, 3.375; 95% CI, 1.356–8.398), also between married marital status and long-term vagal reaction (OR, 4.655; 95% CI, 1.321–16.409). Conclusion: Gender, domicile and marital status factors were associated with COVID-19 vaccine side effects in Indonesian people.