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( Indrawan Cahyo Adilaksono ),( Hiroshi Shimizu ),( Hiroshi Nakashima ),( Juro Miyasaka ),( Katsuaki Ohdoi ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Generation of Ultrafine Bubble (UFB) on hydroponic culture solution has been reported to be able for stimulating the growth of plant. However, the promoting effect of UFB is still hard and inconsistent to be obtained due to the unknown optimum generation of UFB. Generation time of UFB influenced UFB concentration on hydroponic solution. Furthermore, the concentration of UFB have positive correlation with oxidative stress on plant that might affect the growth of plant. In this study, we aim to investigate growth response of lettuce to different UFB water treatment so that the optimum generation of UFB can be obtained. Fifteen seedlings were cultivated on a tray for 4 weeks. The cultivation was conducted at air temperature 20-23°C, relative humidity 60%-80%, under white LEDs that were adjusted at 200 ± 10 μmol·m-2·s-1 and irradiation cycle was set at 16h/8h (light/dark). Ten lettuces were harvested (1st Harvest) on 14th day and five lettuces were harvested (2nd Harvest) on 28th day. Air ultrafine bubble water was generated by UFB Generator (FZ1N-10 I, IDEC Corporation, Japan). UFB water was generated with 3 different generation time; 12 minutes (Gt1), 30 minutes (Gt2), and 120 minutes (Gt3). Generation time of UFB water was parallel with pass number. Pass number is the number of times the control water circulated entirely through the UFB generator. In this experiment, pass number were respectively 10 pass number (Gt1), 25 pass number (Gt2), and 100 pass number (Gt3). Each UFB water (Gt1, Gt2, and Gt3) were distributed respectively into 5 trays with different mixtures between UFB water and normal water as UFB water treatment (10% UFB water, 30% UFB water, 50% UFB water, 75% UFB water, and 100% UFB water). In addition, a tray with normal water was prepared as control treatment. Hydroponic solution was maintained at similar condition of DO, EC, pH, and temperature. The final result reconfirmed again the ability of air UFB water to accelerate the growth of lettuce on hydroponic solution. However, the excess or lack of UFB concentration did not significantly influence the growth of lettuce compared to control treatment. Since, the excess concentration of UFB might inhibit the growth of lettuce due to oxidative stress inside the plant. Moreover, lack concentration of UFB is not enough to stimulate the growth of lettuce. On the other hand, appropriate concentration of UFB significantly increased the fresh weight and dry weight of lettuce. The optimum growth of lettuce tended to shift into low concentration of UFB water when the generation time of UFB water is increased. In our experiment, the optimum growth of lettuce was obtained on 30% UFB water (Gt3) treatment and 75% UFB water (Gt2) treatment. Thus, this result illustrates how different generation of UFB will lead into different final result due to the important role of UFB concentration on the hydroponic solution.
( Rahman Siti Fauziyah ),( Sriramulu Gobikrishnan ),( Natarianto Indrawan ),( Seok Hwan Park ),( Jae Hee Park ),( Kyoung Seon Min ),( Young Je Yoo ),( Don Hee Park ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.10
Levodopa or L-3,4-dihydroxyphenylalanine (L-DOPA) is the precursor of the neurotransmitter dopamine. L-DOPA is a famous treatment for Parkinson`s disease symptoms. In this study, electroenzymatic synthesis of L-DOPA was performed in a three-electrode cell, comprising a Ag/AgCl reference electrode, a platinum wire auxiliary electrode, and a glassy carbon working electrode. L-DOPA had an oxidation peak at 376 mV and a reduction peak at -550 mV. The optimum conditions of pH, temperature, and amount of free tyrosinase enzyme were pH 7, 30℃, and 250 IU, respectively. The kinetic constant of the free tyrosinase enzyme was found for both cresolase and catacholase activity to be 0.25 and 0.4 mM, respectively. A cyclic voltammogram was used to investigate the electron transfer rate constant. The mean heterogeneous electron transfer rate (ke) was 5.8 × 10-4 cm/s. The results suggest that the electroenzymatic method could be an alternative way to produce L-DOPA without the use of a reducing agent such as ascorbic acid.
Rossanto Dwi Handoyo,Kabiru Hannafi Ibrahim,Frandy Yosza Indrawan 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.1
This study uses impulse response function and variance decomposition from the Vector Error Correction Model (VECM) and analyses the response of Jakarta Composite Index (JCI) return to the shocks of oil price, gold price, the exchange rate, interbank interest rates, COVID-19 cases, and the stock market index of Malaysia, Singapore, Thailand, Japan, and the United States. Daily secondary data were used for the analysis and our empirical strategy from the impulse response function divulges that JCI return responds positively to the shock of the Malaysia and Japan stock indices and negatively to Singapore, Thailand, and the United States stock indices. Our finding further reveals that JCI return responds positively to its shock, shocks of the gold price, exchange rates, and negatively respond to the shocks of oil price, interbank rate, and COVID-19 cases. Therefore, based on the study findings policy recommendations are made to mitigate the negative influence of the shocks variables on JCI return.
Formal Mirror Models: an Approach to Just-in-Time Reasoning for Device Ecologies
Seng W. Loke,Sucha Smanchat,Sea Ling,Maria Indrawan 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.1
Pervasive computing calls for new ways of thinking about software and new ways of applying software development techniques. In pervasive computing environments, users will need to interact with collections of devices surrounding them (such as the “system” of smart devices in a user’s home), which we metaphorically term device ecologies. A user can interact with these devices with embedded software and hardware, either directly via the device’s own interface, or automated through scripts executed by a central coordinator. For the latter, we employ a workflow abstraction for the collective operation of devices, which we call decoflow. While executable formal models are typically used at specification time, we maintain and use such models, calling them mirror models, to record the on-going states of devices, their relationships, and the effects that such devices have on the environment. Users effectively update a mirror model of the devices s/he interacts with. The model can be used to predict the effects of decoflows just before execution. Generalizing from mirror models for device ecologies, we propose the novel paradigm of continually updated mirror models for on-going tracking and reasoning about pervasive computing systems which cohabitates with the user.
I Putu Sugiana,Elok Faiqoh,Maria Fernanda Adame,Gede Surya Indrawan,Anak Agung Eka Andiani,I Gusti Ayu Istri Pradnyandari Dewi,I Wayan Eka Dharmawan 한국대기환경학회 2023 Asian Journal of Atmospheric Environment (AJAE) Vol.17 No.1
Behind their role as carbon sinks, mangrove soil can also emit greenhouse gases (GHG) through microbial metabolism. GHG flux measurments of mangroves are scarce in many locations, including Indonesia, which has one of the world’s most extensive and carbon-rich mangrove forests. We measured GHG fluxes ( CO2, CH4, and N2O) during the wet season in Benoa Bay, Bali, a bay with considerable anthropogenic pressures. The mangroves of this Bay are dominated by Rhizophora and Sonneratia spp and have a characteristic zonation pattern. We used closed chambers to measure GHG at the three mangrove zones within three sites. Emissions ranged from 1563.5 to 2644.7 μmol m− 2 h− 1 for CO2, 10.0 to 34.7 μmol m− 2 h− 1 for CH4, and 0.6 to 1.4 μmol m− 2 h− 1 for N2O. All GHG fluxes were not significantly different across zones. However, most of the GHG fluxes decreased landward to seaward. Higher soil organic carbon was associated with larger CO2 and CH4 emissions, while lower redox potential and porewater salinity were associated with larger CH4 emissions. These data suggest that soil characteristics, which are partially determined by location in the intertidal, significantly influence GHG emissions in soils of these mangroves.
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.