Numerical analysis with experimental validation for thermal performance of flat plate solar water heater using CuO/ distilled water nanofluid in closed loop

Helal Ahmad Farhan,Sukanta Nayak,Sanjay,Manikant Paswan 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5

The thermal performance of a solar flat plate collector incorporating CuO nanofluid as a working medium was examined in the present study. The solar collector with two riser tubes was studied experimentally and the results compared with the numerical outcomes predicted using commercially available Ansys 19.0 software. The solar water heater was examined for water and CuO nanofluid with 0.2 wt% and 0.4 wt% for two different volume flow rates of 0.5 and 1 lit/min. The present study claims that the instantaneous thermal efficiency for 0.2 wt% and 0.4 wt% increased by 12.01 % and 7.56 %, respectively, compared to water as a working medium. The effect of CuO/distilled water nanofluid on the collector's efficiency was also numerically studied using a two-phase CFD model. It is observed that the CFD and experimental results show good agreement with each other, with a maximum error of 5.84 % and 4.29 % for the nanofluid and water as working fluids, respectively.

Policy Approaches to Green Growth in Australian Agriculture

Helal Ahammad(헤랄 아하마드) 한국농촌경제연구원 2010 한국농촌경제연구원 연구자료 Vol.- No.-

Carbazole incorporated ratiometric chemosensor for Zn²⁺

Helal, A.,Kim, H.S. Pergamon 2013 Spectrochimica acta. Part A, Molecular and biomole Vol.105 No.-

An electron donating carbazole incorporated thiazole (3) based Zn<SUP>2+</SUP> selective intrinsic chemosensor has been synthesized and investigated. It was found that electron donating substituents such as methyl and carbazole on chemosensor (1) produce remarkable red shift in emission upon complexation with Zn<SUP>2+</SUP>. The sensor shows a selective fluorescence response with Zn<SUP>2+</SUP> over biologically relevant cations (Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, Na<SUP>+</SUP>, and K<SUP>+</SUP>) and biologically non-relevant cations (Cd<SUP>2+</SUP>, In<SUP>3+</SUP> and Ga<SUP>3+</SUP>) in an aqueous ethanol system. It also produce an enhancement in the quantum yield and a longer emission wavelength shift on Zn<SUP>2+</SUP> binding with the potential of a ratiometric assay.

STEPSTONE: An Intelligent Integration Architecture for Personal Tele-Health

Helal, Sumi,Bose, Raja,Chen, Chao,Smith, Andy,De Deugd, Scott,Cook, Diane Korean Institute of Information Scientists and Eng 2011 Journal of Computing Science and Engineering Vol.5 No.3

STEPSTONE is a joint industry-university project to create open source technology that would enable the scalable, "friction-free" integration of device-based healthcare solutions into enterprise systems using a Service Oriented Architecture (SOA). Specifically, STEPSTONE defines a first proposal to a Service Oriented Device Architecture (SODA) framework, and provides for initial reference implementations. STEPSTONE also intends to encourage a broad community effort to further develop the framework and its implementations. In this paper, we present SODA, along with two implementation proposals of SODA's device integration. We demonstrate the ease by which SODA was used to develop an end-to-end personal healthcare monitoring system. We also demonstrate the ease by which the STEPSTONE system was extended by other participants - Washington State University - to include additional devices and end user interfaces. We show clearly how SODA and therefore SODA devices make integration almost automatic, replicable, and scalable. This allows telehealth system developers to focus their energy and attention on the system functionality and other important issues, such as usability, privacy, persuasion and outcome assessment studies.

Networked Robots using ATLAS Service-Oriented Architecture in the Smart Spaces

Helal, Sumi,Bose, Raja,Lim, Shin-Young,Kim, Hyun Korean Institute of Intelligent Systems 2008 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.8 No.4

We introduce new type of networked robot, Ubiquitous Robotic Companion (URC), embedded with ATLAS Service-oriented architecture for enhancing the space sensing capability. URC is a network-based robotic system developed by ETRI. For years of experience in deploying service with ATLAS sensor platform for elder and people with special needs in smart houses, we need networked robots to assist elder people in their successful daily living. Recently, pervasive computing technologies reveals possibilities of networked robots in smart spaces, consist of sensors, actuators and smart devices can collaborate with the other networked robot as a mobile sensing platform, a complex and sophisticated actuator and a human interface. This paper provides our experience in designing and implementing system architecture to integrate URC robots in pervasive computing environments using the University of Florida's ATLAS service-oriented architecture. In this paper, we focus on the integrated framework architecture of URC embedded with ATLAS platform. We show how the integrated URC system is enabled to provide better services which enhance the space sensing of URC in the smart space by applying service-oriented architecture characterized as flexibility in adding or deleting service components of Ubiquitous Robotic Companion.

Fluorescence Sensing Properties of 2-(2'-Hydroxyphenyl)quinoline and Derivatives

Helal, Aasif,Lee, Sang-Hoon,Ren, Wen Xiu,Cho, Chan-Sik,Kim, Hong-Seok Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.5

Novel chemosensors based on 2-(2'-hydroxyphenyl)quinoline were prepared and evaluated for sensing metal cations. The photophysical properties of chemosensors 1-3 were examined and their ion-selectivity was evaluated by measuring their fluorescent emission responses to alkali, alkaline earth, and transition metal ions. Chemosensors 1, 2 and 3 show ratiometric and enhanced fluorescence changes with transitional metals that are efficient fluorescence quenchers, especially 3 has a high binding constant with $Hg^{+2}$ in $CH_3CN$.

Effect of Hfe Deficiency on Memory Capacity and Motor Coordination after Manganese Exposure by Drinking Water in Mice

Helal Hussain Alsulimani,Qi Ye,Jonghan Kim 한국독성학회 2015 Toxicological Research Vol.31 No.4

Excess manganese (Mn) is neurotoxic. Increased manganese stores in the brain are associated with a number of behavioral problems, including motor dysfunction, memory loss and psychiatric disorders. We previously showed that the transport and neurotoxicity of manganese after intranasal instillation of the metal are altered in Hfe-deficient mice, a mouse model of the iron overload disorder hereditary hemochromatosis (HH). However, it is not fully understood whether loss of Hfe function modifies Mn neurotoxicity after ingestion. To investigate the role of Hfe in oral Mn toxicity, we exposed Hfe-knockout (Hfe<SUP>−/−</SUP>) and their control wild-type (Hfe<SUP>+/+</SUP>) mice to MnCl₂ in drinking water (5 mg/mL) for 5 weeks. Motor coordination and spatial memory capacity were determined by the rotarod test and the Barnes maze test, respectively. Brain and liver metal levels were analyzed by inductively coupled plasma mass spectrometry. Compared with the water-drinking group, mice drinking Mn significantly increased Mn concentrations in the liver and brain of both genotypes. Mn exposure decreased iron levels in the liver, but not in the brain. Neither Mn nor Hfe deficiency altered tissue concentrations of copper or zinc. The rotarod test showed that Mn exposure decreased motor skills in Hfe<SUP>+/+</SUP> mice, but not in Hfe<SUP>−/−</SUP> mice (p = 0.023). In the Barns maze test, latency to find the target hole was not altered in Mn-exposed Hfe+/+ compared with water-drinking Hfe<SUP>+/+</SUP> mice. However, Mn-exposed Hfe<SUP>−/−</SUP> mice spent more time to find the target hole than Mn-drinking Hfe<SUP>+/+</SUP> mice (p = 0.028). These data indicate that loss of Hfe function impairs spatial memory upon Mn exposure in drinking water. Our results suggest that individuals with hemochromatosis could be more vulnerable to memory deficits induced by Mn ingestion from our environment. The pathophysiological role of HFE in manganese neurotoxicity should be carefully examined in patients with HFE-associated hemochromatosis and other iron overload disorders.

Sensing of Cyanide Using Highly Selective Thiazole-based Cu²⁺ Chemosensor

Helal, Aasif,Kim, Se-Beom,Kim, Hong-Seok Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.suppl8

STEPSTONE : An Intelligent Integration Architecture for Personal Tele-Health

Sumi Helal,Raja Bose,Chao Chen,Andy Smith,Scott de Deugd,Diane Cook 한국정보과학회 2011 Journal of Computing Science and Engineering Vol.5 No.3

STEPSTONE is a joint industry-university project to create open source technology that would enable the scalable, “friction-free” integration of device-based healthcare solutions into enterprise systems using a Service Oriented Architecture (SOA). Specifically, STEPSTONE defines a first proposal to a Service Oriented Device Architecture (SODA) framework, and provides for initial reference implementations. STEPSTONE also intends to encourage a broad community effort to further develop the framework and its implementations. In this paper, we present SODA, along with two implementation proposals of SODA’ device integration. We demonstrate the ease by which SODA was used to develop an end-to-end personal healthcare monitoring system. We also demonstrate the ease by which the STEPSTONE system was extended by other participants ?Washington State University ?to include additional devices and end user interfaces. We show clearly how SODA and therefore SODA devices make integration almost automatic, replicable, and scalable. This allows telehealth system developers to focus their energy and attention on the system functionality and other important issues, such as usability, privacy, persuasion and outcome assessment studies.

무선 센서 네트워크를 위한 잔여 에너지 인지형 협력 MAC 프로토콜

Mohammad Helal Uddin Ahmed,홍충선(Choong Seon Hong) 한국정보과학회 2012 정보과학회 컴퓨팅의 실제 논문지 Vol.18 No.3

최근 신뢰성과 에너지 효율성을 높이기 위한 협력 통신에 대한 연구가 활발하게 진행중이다. 그러나 네트워크 성능 향상을 위해서는 전달자를 선택하는 방법 또한 매우 중요한 이슈이다. 많은 논문에서 노드 간의 에너지 소비 불균형으로 네트워크가 작동을 멈췄을 때 많은 양에 에너지가 사용되지 않고 노드 상에 남아 있는 것을 확인할 수 있다. 본 논문에서는 노드 간의 에너지 소모 균형을 유지하면서 최적의 전달자 노드를 선택하는 프레임워크를 제안한다. 또한 CoopMAC보다 70%이상 에너지 효율적인 REC-MAC 프로토콜을 제안한다. 시뮬레이션 결과를 통해 CoopMAC보다 종 대 종 지연이 더 낮은 것도 확인할 수 있다. In this paper, we provide a framework to select an optimal relay that keeps the balance of energy consumption among the nodes. We also propose RECMAC protocol which is more than 70% energy-efficient over CoopMAC. Simulation results also show that end-2- end delay of REC-MAC is better than CoopMAC.