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Syed Sabir Hussain Bukhari,Shahid Atiq,Thomas A. Lipo,Byung-il Kwon 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
Sudden voltage drops and outages frequently disturb the operation of sensitive loads for domestic, commercial, and industrial use. In some cases, these events may even impair the functioning of relevant equipment. To maintain power under such conditions, a UPS system is usually installed. Once a disturbance happens at the grid side, the line-interactive UPS system takes over the load to prevent an interruption. But, due to magnetic saturation of the transformer, a significant inrush current may occur for the transformer-coupled loads during this transition. The generation of such transient currents may in turn decrease the line voltage and activates over-current protecting devices of the system. In this work, a cost-effective, line-interactive UPS system is proposed that eliminates the inrush current phenomenon associated with transformer-coupled loads. The strategy was implemented by connecting a standard current-regulated voltage source inverter (CRVSI) to the secondary winding of the load transformer. During any transient condition at the grid side, the load current is monitored and regulated to achieve either seamless compensation of the load current or complete transferal of load from grid to the inverter. Experimental results were obtained for a prototype under all possible operating conditions so as to validate the performance of the proposed topology.
Bukhari, Syed Sabir Hussain,Atiq, Shahid,Lipo, Thomas A.,Kwon, Byung-il The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
Sudden voltage drops and outages frequently disturb the operation of sensitive loads for domestic, commercial, and industrial use. In some cases, these events may even impair the functioning of relevant equipment. To maintain power under such conditions, a UPS system is usually installed. Once a disturbance happens at the grid side, the line-interactive UPS system takes over the load to prevent an interruption. But, due to magnetic saturation of the transformer, a significant inrush current may occur for the transformer-coupled loads during this transition. The generation of such transient currents may in turn decrease the line voltage and activates over-current protecting devices of the system. In this work, a cost-effective, line-interactive UPS system is proposed that eliminates the inrush current phenomenon associated with transformer-coupled loads. The strategy was implemented by connecting a standard current-regulated voltage source inverter (CRVSI) to the secondary winding of the load transformer. During any transient condition at the grid side, the load current is monitored and regulated to achieve either seamless compensation of the load current or complete transferal of load from grid to the inverter. Experimental results were obtained for a prototype under all possible operating conditions so as to validate the performance of the proposed topology.
Syed Sabir Hussain Bukhari,Thomas A. Lipo,Byung-il Kwon 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Numerous industrial facilities involve the installation of load transformers with their respective loads. As loads are turned on and off, these transformers are energized and de-energized, respectively, which can cause serious disturbances to sensitive loads. An inrush current, which typically occurs when a transformer is energized, can easily be observed using on-line uninterruptible power supply (UPS) systems feeding such loads. This paper proposes an on-line UPS system that eliminates the inrush current phenomenon caused by the energizing of load transformers. The UPS inverter specifically utilizes a fast acting current control scheme that enables it to regulate current for the load during all energizing conditions of load transformer connected to the UPS system.
Sajid Qayyum,Tasawar Hayat,Sabir A. Shehzad,Ahmed Alsaedi 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
The main purpose of this article is to describe the magnetohydrodynamic stagnation point flow ofWalter-B nanofluid over a stretching sheet. The phenomena of heat and mass transfer are based on theinvolvement of thermal radiation and chemical reaction. Characteristics of Newtonian heating are givenspecial attention. The Brownian motion and thermophoresis models are introduced in the temperatureand concentration expressions. Appropriate variables are implemented for the transformation of partialdifferential frameworks into sets of ordinary differential equations. Plots for velocity, temperature, andnanoparticle concentration are displayed and analyzed for governing parameters. The skin friction coefficientand local Nusselt and Sherwood numbers are studied using numerical values. The temperatureand heat transfer rate are enhanced within the frame of the thermal conjugate parameter.
S.M. Sabir,H. Maqsood,Imran Hayat,M.Q. Khan,A. Khaliq 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.4
Sea buckthorn (Hippophae rhamnoides ssp. turkestanica) is a very important medicinal plant in northern ar-eas of Pakistan. The fruit of sea buckthorn is rich in nutrients and medicinal compounds such as vitamins, carotene, flavonoids,essential oil, carbohydrates, organic acids, amino acids, and minerals. In order to compare various populations of sea buck-thorn for chemical composition, eight populations from different areas of northern Pakistan were compared using fruit char-acteristics. Phytochemical analysis of berries showed vitamin C (250333 mg/100 g), seed oil (7.6913.7%), oil in softer pulp(19.229.1%), phytosterol content of seed oil (3.35.5%), and anthocyanin (0.525 mg/L), while the mineral element com-position analysis revealed high contents of potassium (140360 ppm), sodium (2080 ppm), calcium (7098 ppm), magne-sium (150240 ppm), iron (40150 ppm), and phosphorus (110133 ppm). This study established sea buckthorn berries as agood source of biochemical and mineral elements. The high variation between different populations shows the potential ofselecting and breeding of the raw material for various defined purposes.
( Christopher M Dussik ),( Maryam Hockley ),( Aleksandra Grozi ),( Ichiro Kaneko ),( Lin Zhang ),( Marya S Sabir ),( Jin Park ),( Jie Wang ),( Cheryl A Nickerson ),( Steven H Yale ),( Christopher J Ra 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.1
Background/Aims Irritable bowel syndrome (IBS) is a multifaceted disorder that afflicts millions of individuals worldwide. IBS is currently diagnosed based on the presence/duration of symptoms and systematic exclusion of other conditions. A more direct manner to identify IBS is needed to reduce healthcare costs and the time required for accurate diagnosis. The overarching objective of this work is to identify gene expression-based biological signatures and biomarkers of IBS. Methods Gene transcripts from 24 tissue biopsy samples were hybridized to microarrays for gene expression profiling. A combination of multiple statistical analyses was utilized to narrow the raw microarray data to the top 200 differentially expressed genes between IBS versus control subjects. In addition, quantitative polymerase chain reaction was employed for validation of the DNA microarray data. Gene ontology/pathway enrichment analysis was performed to investigate gene expression patterns in biochemical pathways. Finally, since vitamin D has been shown to modulate serotonin production in some models, the relationship between serum vitamin D and IBS was investigated via 25-hydroxyvitamin D (25[OH]D) chemiluminescence immunoassay. Results A total of 858 genetic features were identified with differential expression levels between IBS and asymptomatic populations. Gene ontology enrichment analysis revealed the serotonergic pathway as most prevalent among the differentially expressed genes. Further analysis via real-time polymerase chain reaction suggested that IBS patient-derived RNA exhibited lower levels of tryptophan hydroxylase-1 expression, the enzyme that catalyzes the rate-limiting step in serotonin biosynthesis. Finally, mean values for 25(OH)D were lower in IBS patients relative to non-IBS controls. Conclusions Values for serum 25(OH)D concentrations exhibited a trend towards lower vitamin D levels within the IBS cohort. In addition, the expression of select IBS genetic biomarkers, including tryptophan hydroxylase 1, was modulated by vitamin D. Strikingly, the direction of gene regulation elicited by vitamin D in colonic cells is “opposite” to the gene expression profile observed in IBS patients, suggesting that vitamin D may help “reverse” the pathological direction of biomarker gene expression in IBS. Thus, our results intimate that IBS pathogenesis and pathophysiology may involve dysregulated serotonin production and/or vitamin D insufficiency. (J Neurogastroenterol Motil 2018;24:96-106)
박형철,이신영,박보경,최원규,김찬민,Sanghun Lee,정우식,이상열,Jamal Sabir,Ray A. Bressan,Hans J. Bohnert,Tesfaye Mengiste,윤대진 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.1
In the interaction between plants and pathogens, carbon (C) resources provide energy and C skeletons to maintain, among many functions, the plant immune system. However, variations in C availability on pathogen associated molecular pattern (PAMP) triggered immunity (PTI) have not been systematically examined. Here, three types of starch mutants with enhanced susceptibility to Pseudomonas syringae pv. tomato DC3000 hrcC were examined for PTI. In a dark perioddependent manner, the mutants showed compromised induction of a PTI marker, and callose accumulation in response to the bacterial PAMP flagellin, flg22. In combination with weakened PTI responses in wild type by inhibition of the TCA cycle, the experiments determined the necessity of C-derived energy in establishing PTI. Global gene expression analyses identified flg22 responsive genes displaying C supply-dependent patterns. Nutrient recycling-related genes were regulated similarly by C-limitation and flg22, indicating re-arrangements of expression programs to redirect resources that establish or strengthen PTI. Ethylene and NAC transcription factors appear to play roles in these processes. Under C-limitation, PTI appears compromised based on suppression of genes required for continued biosynthetic capacity and defenses through flg22. Our results provide a foundation for the intuitive perception of the interplay between plant nutrition status and pathogen defense.
Park, Hyeong Cheol,Lee, Shinyoung,Park, Bokyung,Choi, Wonkyun,Kim, Chanmin,Lee, Sanghun,Chung, Woo Sik,Lee, Sang Yeol,Sabir, Jamal,Bressan, Ray A.,Bohnert, Hans J.,Mengiste, Tesfaye,Yun, Dae-Jin Korean Society for Molecular and Cellular Biology 2015 Molecules and cells Vol.38 No.1
In the interaction between plants and pathogens, carbon (C) resources provide energy and C skeletons to maintain, among many functions, the plant immune system. However, variations in C availability on pathogen associated molecular pattern (PAMP) triggered immunity (PTI) have not been systematically examined. Here, three types of starch mutants with enhanced susceptibility to Pseudomonas syringae pv. tomato DC3000 hrcC were examined for PTI. In a dark period-dependent manner, the mutants showed compromised induction of a PTI marker, and callose accumulation in response to the bacterial PAMP flagellin, flg22. In combination with weakened PTI responses in wild type by inhibition of the TCA cycle, the experiments determined the necessity of C-derived energy in establishing PTI. Global gene expression analyses identified flg22 responsive genes displaying C supply-dependent patterns. Nutrient recycling-related genes were regulated similarly by C-limitation and flg22, indicating re-arrangements of expression programs to redirect resources that establish or strengthen PTI. Ethylene and NAC transcription factors appear to play roles in these processes. Under C-limitation, PTI appears compromised based on suppression of genes required for continued biosynthetic capacity and defenses through flg22. Our results provide a foundation for the intuitive perception of the interplay between plant nutrition status and pathogen defense.
An Application of Binary Soft Mappings to the Problem in Medical Expert Systems
Sabir Hussain,Mashael M.A. Alkhalifah 한국전산응용수학회 2020 Journal of applied mathematics & informatics Vol.38 No.5
We initiate and introduce the notion of binary soft mapping, which is defined on collection of binary soft sets named as binary soft class over two initial universes U_{1} and U_{2} with fixed set of parameters. We also define and study the properties of binary soft images and binary soft inverse images of binary soft sets. Examples and counter examples are also given in support of presented properties. Moreover, these concepts are applied to the problem of medical diagnosis in medical expert systems.