Functional and Environmental Advantage of Cleaning Ti5B1 Master Alloy

Aleksandar Mitrašinović,Miloš Tomić 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3

One of the greatest environmental goals for the aluminum alloys industry is generating higher quality products by introducing cleaner input materials while maintaining low production costs. A typical dilemma for the master alloy producers is the cleanness level of the master alloy since insoluble inclusions could serve as inoculants during the solidification process. In this work, commercial Ti5B1 master alloy is used for grain refinement of Al7Si4Cu aluminum alloy and compared with the cleaned master alloy that contained a lower amount of residual refractory oxides and salts. Metallography analysis was used for grain size measurement while Computer Aided Cooling Curve Analysis was used for assessment of the undercooling and heat release values. In all instances, specimens treated with the cleaned master alloy showed smaller grains in the final structure and lower undercooling values. The difference in released heat between liquidus and recalescence temperatures was about 25% in specimens where added 0.66 wt% of cleaned master alloys compared to specimens where the commercial master alloys were added. Using cleaner Ti5B1 master alloy with a higher number of TiAl 3 and TiB 2 particles improves its grain refi nementefficiency and transmits fewer impurities in produced parts. Producing cleaner master alloy would be beneficial from economic and environmental aspects by increasing its value and service time of produced parts besides simplifying the recycling process at the end of parts life-cycle.

On Modeling and Simulation of AI-based IoT

Mitra Pooyandeh,Insoo Sohn(손인수) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

Nowadays, the Internet of Things has become one of the essential technologies for connecting devices in the telecommunications, electricity, medical, automotive, and other industries. The Internet of Things includes an infinite set of connections and intelligent endpoints such as sensors, actuators, and so on. IoT devices, which include sensor networks with an unlimited number of sensors, face many problems, including power limitations and hardware limitations. Therefore, simulation is the best solution for changing and extending protocols in sensor networks. Furthermore, AI is becoming an important tool to solve problem related to IoT and hardware and power constraints. In this article, we review existing simulation and modeling tools and discuss including AI in the simulation.

Study of compounds, cytotoxicity and biological activities of essential oil of Satureja rechingeri Jamzad

Mitra Arman,Kiana Pirian,Mostafa Alinaghizadeh,Fatemeh Khosheghbal,Reza Nahavandi,Saeid Tamadoni Jahromi 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4

Nowadays, the essential oil has received a special position for the treatment of diseases. Although Satureja rechingeri Jamzad is an endemic species of Iran, unfortunately few studies have been conducted on its biological properties. In this study, along with the analysis of the compounds of Satureja rechingeri essential oil, cytotoxic, antioxidant and antibacterial properties of the essential oil of this species were investigated. The compounds of prepared essential oil were analyzed by GC-FID and GC–MS using Clevenger. Disc diffusion and MTT methods were used to determine the antibacterial activity and cytotoxicity of the essential oil, respectively. The antioxidant activity of the essential oil was measured by two methods of reducing power assay and DPPH free radical scavenging. p-Cymene (46.5%) was the most identified compound in the essential oil. The essential oil showed higher inhibitory effect on seven bacterial strains relative to the standard antibiotics. The studied essential oil showed significant concentration-dependent inhibitory effect on four cancer cells of Vero, SW480, MCF7 and JET3 with 50% lethal effect of 15.6, 125, 15.6 and 250 μg/mL for each line, respectively. The highest adsorption (2.6 nM) was at 500 μg/mL for reducing power assay and 50% free radical inhibition at a concentration of 375 μg/mL for DPPH antioxidant assay. In general, the essential oil of Satureja rechingeri with high antioxidant, antibacterial and anticancer activity can be used as a cheap and affordable natural product in clinical and pharmaceutical fields.

Types and Major Causes of Conflict Experienced by Iranian Nurses

Mitra Payami Bousari,Fazlolah Ahmadi,Nahid Bousari Kennedy 한국간호과학회 2009 한국간호과학회 학술대회 Vol.2009 No.10

Improved DCT-Based Image Coding and Decoding Methods For Low-Bit Rate Applications

Mitra, Sanjit K.,Jung,sung-Hwan 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-

The discrete cosine transform(DCT) is well known for highly efficient coding performance, and it is widely used in many image compression applications. However, in low-bit rate coding, it produces undesirable block artifacts that are visually not pleasing. In addition, in many applications, faster computation and easier VLSI implementation of DCT coefficients are also important issues. The removal of the block artifacts and faster DCT computation are therefore of practical interest. In this paper, we outline a modified DCT computation scheme that provides a simple efficient solution to the reduction of the block artifacts while achieving faster computation. We also derive a similar solution for the efficient computation of the inverse DCT. We have applied the new approach for the low-bit rate coding and decoding of images. Intial simulation results on real images have verified the improved performance obtained using the proposed method over the standard JPEG method.

Study of federated learning in industrial IoT

Mitra Pooyandeh,Insoo Sohn 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11

The Industrial Internet of Things (IIoT) is actually a subset of IoT. Therefore, the growing development of IoT technology in recent years and its application in the industry have improved the performance of various industries. Certainly, the extensive usage of IoT in industrial is led to producing a huge amount of data that require a server for processing. while sending this amount of data causes several issues such as data centralization and privacy-preserving. Federated learning (FL) is an exhaustive solution to overcome these problems. Given that federated learning technology implemented in IIoT keep the data on the device as result, it helps the data security and optimizes the communication cost. In this article, we present a study of FL in IIoT.

Measurements of Nuclear Track Etch Induction Time in Markrofol for Alpha Particles from a 252-Cf Source

Mitra Ghergherehchi,Xiang-Jie Mu,채종서,김윤상 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.9

Makrofol DE1-4C detectors were exposed to fission fragments and alpha particles (of energy 0.5 -3 MeV) from a 252Cf source in a vacuum chamber. The exposed detectors were etched in 6-N NaOHsolution at 70 C to measure etch induction times. An optical microscope was used to investigatevarious charged particle tracks and diameters in Makrofol detectors. The etch induction times foralpha-particle and fission-fragment tracks were obtained from the intersections of extrapolations ofa graph of track diameters with time. The obtained results will be very useful in nuclear trackstudies, as well as nanotechnology fields.

Diversity of medicinal plant traditionally used by Baiga tribes in District Umaria, Madhya Pradesh, India

Mitra Arman 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4

The conventional source of medicinal plants is an important way for daily curative uses in rural area throughout Madhya Pradesh. Folk medicinal specialists or traditional healer (Medicine men), assume an indispensable part in a medicinal services arrangement of both provincial and urban populace of the nation. It is vital to conduct broad meetings of individual medicine men of an area to get the overall status of medicinal plants. A survey was accomplished in the rustic territory of district Umaria, Madhya Pradesh. This investigation has uncovered a sum of 40 plants out of which 33 plants were identified, which belongs to 22 families. Whole plants and/or plant parts, like leaves, stems, barks, roots, flowers, fruits, seeds and wood were usually used by Biga tribe (Medicine men) for the treatment of different illnesses. Leaves (5%) were the most oftentimes used plant parts, trailed by roots (11%), fruits (3%) barks (5%), whole plants (3%), seeds (2%), latex (2%) and flowers (2%). Add up to 33 diverse individual illnesses professed to be restored by plant parts including Breast abscess, Cure carbuncle, Cure rheumatic, Cure scabies, Diabetes, Diarrhoea, Eczema, Haematuria, Headache, Jaundice, Leucorrhoea, Leukoderma, Menstrual disorder, Piles, Rat bites, Scorpion bite, Skin burns, Skin disease, Spermatorrhea, Stomachache, Toothache, Typhoid and fever, used to abortifacient, increase milk after delivery, Whooping cough and Wounds of animals. Several uses of the plants could be validated by available literature review. It is expected that other plants used for treatment of various diseases by the Biga tribes (medicine men) can be subjected for further bio-activity and phytochemical studies, which prompts disclosure of new medications.

Effect of Cu Layer Thickness on Giant Magnetoresistance Properties of NiCoFe/Cu/NiCoFe Sandwich

Mitra Djamal,Ramli,Yulkifli,Khairurrijal 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

The NiCoFe/Cu/NiCoFe sandwiches were grown onto Si (111) substrate by dc-opposed target magnetron sputtering (dc-OTMS) technique. The growth parameters are: temperature 100 <SUP>0</SUP>C, applied voltage 600 volt, flow rate of Ar gas 100 sccm, and growth pressure 5.2 x10<SUP>-1</SUP> Torr. The effects of Cu layer thickness on giant magnetoresistance (GMR) property of NiCoFe/Cu/NiCoFe sandwich were studied. We have found that the giant magnetoresistance (GMR) ratio is varied depend on the non-magnetic (Cu) layer thickness. The variation of Cu layer thickness of NiCoFe/Cu/NiCoFe sandwich presents an oscillatory behavior of GMR ratio. This oscillation reflects the exchange coupling oscillations between ferromagnetic and antiferromagnetic states, which are caused by an oscillation in the sign of the interlayer exchange coupling between ferromagnetic layers.

A Digital Twin-based Approach for Charge Estimation in Electric Vehicle

Mitra Pooyandeh,Insoo Sohn 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6