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Halder, D,Mandal, C,Lee, BH,Lee, JS,Choi, MR,Chai, JC,Lee, YS,Jung, KH,Chai, YG Scientific & Medical Division,Macmillan Press 2015 Human & experimental toxicology Vol.34 No.10
<P>Ethanol (EtOH) exposure during embryonic development causes dysfunction of the central nervous system (CNS). Here, we examined the effects of chronic EtOH on gene expression during early stages of neuronal differentiation. Human embryonic carcinoma (NCCIT) cells were differentiated into neuronal precursors/lineages in the presence or absence of EtOH and folic acid. Gene expression profiling and pathway analysis demonstrated that EtOH deregulates many genes and pathways that are involved in early brain development. EtOH exposure downregulated several important genes, such as <I>PCDHB14, GABRB1, CTNND2, NAV3, RALDH1,</I> and <I>OPN5,</I> which are involved in CNS development, synapse assembly, synaptic transmission, and neurotransmitter receptor activity. GeneGo pathway analysis revealed that the deregulated genes mapped to disease pathways that were relevant to fetal alcohol spectrum disorders (FASD, such as neurotic disorders, epilepsy, and alcohol-related disorders). In conclusion, these findings suggest that the impairment of the neurological system or suboptimal synapse formation resulting from EtOH exposure could underlie the neurodevelopmental disorders in individuals with FASD.</P>
Numerical optimization of Wells turbine for wave energy extraction
Halder, Paresh,Rhee, Shin Hyung,Samad, Abdus The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.1
The present work focuses multi-objective optimization of blade sweep for a Wells turbine. The blade-sweep parameters at the mid and the tip sections are selected as design variables. The peak-torque coefficient and the corresponding efficiency are the objective functions, which are maximized. The numerical analysis has been carried out by solving 3D RANS equations based on k-w SST turbulence model. Nine design points are selected within a design space and the simulations are run. Based on the computational results, surrogate-based weighted average models are constructed and the population based multi-objective evolutionary algorithm gave Pareto optimal solutions. The peak-torque coefficient and the corresponding efficiency are enhanced, and the results are analysed using CFD simulations. Two extreme designs in the Pareto solutions show that the peak-torque-coefficient is increased by 28.28% and the corresponding efficiency is decreased by 13.5%. A detailed flow analysis shows the separation phenomena change the turbine performance.
A Review on Techniques to Control and Mitigate Odors in Swine Facilities
Halder, J. N.,이명규 강원대학교 농업생명과학연구원 2020 강원 농업생명환경연구 Vol.32 No.3
Malodor emission from livestock and manure production facilities is a persistent concern for researchers and farm owners. Intensive livestock production and manure management have gained significant environmental attention; malodorous emissions are also a concern for livestock and human health. Several technologies, methods, and techniques have been developed in an attempt to resolve the concerns associated with malodorous emissions. Malodorous compounds consist of hundreds of chemical compounds; the most common compounds that humans can smell or sense are volatile organic compounds, ammonia, hydrogen sulfide, and volatile fatty acids. Livestock production houses and manure storage and treatment facilities are key sources of malodorous gas emissions. Livestock feed, the animals themselves, and microbial reactions in the manure are all responsible for malodorous gas generation. The objective of this article is to review the sources of malodorous gas emissions, the common malodorous compounds, and the practices, techniques, and technologies that are used to mitigate the issues related to these emissions.
Halder, Tanmoy,Karforma, Sunil,Mandal, Rupali Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.2
In order to protect secret digital documents against vulnerabilities while communicating, steganography algorithms are applied. It protects a digital file from unauthorized access by hiding the entire content. Pixel-value-difference being a method from spatial domain steganography utilizes the difference gap between neighbor pixels to fulfill the same. The proposed approach is a block-wise embedding process where blocks of variable size are chosen from the cover image, therefore, a stream of secret digital contents is hidden. Least significant bit (LSB) substitution method is applied as an adaptive mechanism and optimal pixel adjustment process (OPAP) is used to minimize the error rate. The proposed application succeeds to maintain good hiding capacity and better signal-to-noise ratio when compared against other existing methods. Any means of digital communication specially e-Governance applications could be highly benefited from this approach.
Halder, Sukanta,Kotturu, Janardhana,Agarwal, Pramod,Srivastava, Satya Prakash The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2
This paper presents a capacitor voltage balancing topology using a three-level boost converter (TLBC) for a neutral point clamped (NPC) three-level inverter fed surface permanent magnet synchronous motor drive (SPMSM). It enhanced the performance of the drive in terms of its voltage THD and torque pulsation. The main attracting feature of the proposed control is the boosting of the input voltage and at the same time the balancing of the capacitor voltages. This control also reduces the computational complexity. For the purpose of close loop vector control, a software based cost effective resolver to digital converter RDC-less estimation is implemented to calculate the speed and position. The proposed drive is simulated in the MATLAB/SIMULINK environment and an experimental investigation using dSPACE DS1104 validates the proposed drive system at different operating condition.
Halder, D.,Chang, G.E.,De, D.,Cheong, E.,Kim, K.,Shin, I. Current Biology Ltd ; Elsevier Science Ltd 2015 Chemistry & biology Vol.22 No.11
Sox2 is a key player in the maintenance of pluripotency and stemness, and thus inhibition of its function would abrogate the stemness of pluripotent cells and induce differentiation into several types of cells. Herein we describe a strategy that relies on a combination of Sox2 inhibition with lineage-specific induction to promote efficient and selective differentiation of pluripotent P19 cells into neurons. When P19 cells transduced with Skp protein, an inhibitor of Sox2, are incubated with a neurogenesis inducer, the cells are selectively converted into neurons that generate depolarization-induced sodium currents and action potentials. This finding indicates that the differentiated neurons are electrophysiologically active. Signaling pathway studies lead us to conclude that a combination of Skp with the neurogenesis inducer enhances neurogenesis in P19 cells by activating Wnt and Notch pathways. The present differentiation protocol could be valuable to selectively generate functionally active neurons from pluripotent cells.
( Halder Joshua Nizel ),( Kang Taek-won ),( Lee Myung-gyu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
Most of the biogas centers in Korea produce anaerobic digestate as a byproduct which either sent to wastewater treatment facilities or recycle to liquid fertilizer. Therefore, the adoption of odor-free composting technology for post-processing of digestate would be essential for promoting the safe return of digestate to the farmland, and this requires the quality of digestate to be tested and verified in categories of risk, safety, homogeneity and nutrients. The thermophilic aerobic oxidation (TAO) process (hereinafter, the TAO system) is a technology that composts organic matter such as livestock manure in a short period of time by maintaining a high temperature in an aerobic condition without the use of any external heat source. It is capable of producing enzymes of proven utility and safety by maintaining stable production of heat energy at 50-60°C constantly during high-temperature liquid fermentation of pig slurry. Therefore, TAO system may use to necessary heat energy production, omitting pathogenic microorganisms, eliminating odor-causing ammonia, and could reduce volatile solids and organic materials to stabilize anaerobic digester as liquid fertilizer. In this study it has been tried to evaluate the physiochemical compositions of anaerobic liquids and evaluate internal and external temperature condition changes of the reactor when anaerobic digestate was treated by the TAO system. While treating digestate in TAO reactor the internal temperature of the reactor was reached at 51℃ in 1<sup>st</sup> day and remain till 6<sup>th</sup> days. During the treatment physiochemical compositions of liquids pH increase 8.1 to 9.8 and EC decreased from 29.8 to 12.0 mS/cm. CODcr decreased from 22,654 to 18,843 mg/L which showed about 16.82% of removal efficiency. TN and NH<sub>4</sub>-N decreased from 4,813 to 1,733 mg/L, from 3,815 to 812 mg/L respectively, which showed about 64.0% and 78.7% of removal efficiency respectively.
Active and passive surveillance of bovine spongiform encephalopathy in Bangladesh
Halder, Shukla,Chowdhury, Emdadul Haque,Parvin, Rokshana,Rahaman, Mohammad Moshiyour,Rahman, Seikh Masudur,Saha, Shib Shankar,Sultana, Sajeda,Marium, Nadira,Islam, Azharul,Rahman, Md. Siddiqur,Song, H The Korean Society of Veterinary Service 2009 韓國家畜衛生學會誌 Vol.32 No.4
The aim of the present study was to investigate whether Bovine Spongiform Encephalopathy (BSE) is present in this country and to analyze the Global BSE Risk (GBR) status in Bangladesh. A total of 2,000 brain samples were collected from cattle older than 30 months of age, slaughtered for human consumption in the district slaughter houses from 2005 to 2006. The brainstem (obex), Pyriform lobe, cerebrum and cerebellum were subjected to histopathological study. Samples that showed some nonspecific lesions were subjected to immunohistochemistry and only brain stem to ELISA for the detection of abnormal prion protein $PrP^{sc}$. In passive surveillance, annual overall diseases of cattle, buffalo, sheep and goats in Bangladesh were collected from Department of Livestock Services (DLS), Dhaka to investigate the occurrences of neurological diseases. Import related data were collected from "National Export Promotion Bureau" Kawran Bazar, Bangladesh Bank and DLS to analyze the importing products of animal origin (cattle, buffalo, sheep and goats) from different countries to find whether or not the imported products posed any risk for the BSE. In an actire surveillance conducted in slaughter house, histopathologically BSE specific lesions were not detected in any of the brain samples, but other nonspecific lesions were observed. No $PrP^{sc}$ was detected from the samples by immunohistochemistry and ELISA. DLS report also supported the absence of BSE in cattle and buffalo and scrapie in sheep and goats in Bangladesh. It was also clearly recorded that Bangladesh imported livestock products from countries in GBR level I and II but not from countries in GBR level III and IV. From this study it apparently seems that BSE is not currently present in the indigenous animals in Bangladesh and poses no or negligible risk to human and animal health.