Himanshu Chandra - Academia.edu (original) (raw)
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Papers by Himanshu Chandra
To assess the techno-economic screening of HTL oil for various feedstock, it is crucial to have i... more To assess the techno-economic screening of HTL oil for various feedstock, it is crucial to have information on molecular composition of the feed and products. There are limitations of existing analytical methods to identify and quantify all the molecules present in the bio-fuel. Therefore, there is a need to find alternate ways to quantify the molecular composition of feed and expected products. The modelling work on bio-oil is developed based on a mathematical approach using simple analytical results like CHNO along with structural analysis of oil like FTIR, NMR analysis for HTL derived oil from microalgae. This mathematical framework is further extended to predict the molecular composition of HTL-oil obtained from feedstocks like mixed plastic waste, sludge etc. A multi-dimensional molecular matrix is developed based on the distributions of side chains, aromatic rings, and olefinic carbon on top of core molecules. Optimum parameters are found using appropriate optimization algorit...
Frontiers in Medicine, 2020
In South Korea, the first confirmed case of coronavirus 2019 (COVID-19) was detected on January 2... more In South Korea, the first confirmed case of coronavirus 2019 (COVID-19) was detected on January 20, 2020. After a month, the number of confirmed cases surged, as community transmission occurred. The local hospitals experienced severe shortages in medical resources such as mechanical ventilators and extracorporeal membrane oxygenation (ECMO) equipment. With the medical claims data of 7,590 COVID-19 confirmed patients, this study examined how the demand for major medical resources and medications changed during the outbreak and subsequent stabilization period of COVID-19 in South Korea. We also aimed to investigate how the underlying diseases and demographic factors affect disease severity. Our findings revealed that the risk of being treated with a mechanical ventilator or ECMO (critical condition) was almost twice as high in men, and a previous history of hypertension, diabetes, and psychiatric diseases increased the risk for progressing to critical condition [Odds Ratio (95% CI), 1...
International Journal of Computer Applications, Sep 10, 2010
A number of active queue management algorithms for TCP/IP networks such as RED, SRED, DRED and SD... more A number of active queue management algorithms for TCP/IP networks such as RED, SRED, DRED and SDRED have been proposed in the past few years. This article presents a comparative study of these algorithms using simulations. The evaluation is done using the OPNET Modeler, which provides a convenient and easy-touse platform for simulating largescale networks. The performance metrics used in the study are queue size, packet drop probability, and packet loss rate. The study shows that, among the four algorithms, SRED and DRED are more effective at stabilizing the queue size and controlling the packet loss rate while maintaining high link utilization. The benefits of stabilized queues in a network are high resource utilization, bounded delays, more certain buffer provisioning, and traffic-load-independent network performance in terms of traffic intensity and number of TCP connections.
As part of the resource allocation mechanisms, each router must implement some queuing discipline... more As part of the resource allocation mechanisms, each router must implement some queuing discipline that governs how packets are buffered while waiting to be transmitted. Various queuing disciplines can be used to control which packets get transmitted (bandwidth allocation) and which packets get dropped (buffer space). The queuing discipline also affects the latency experienced by a packet, by determining how
Urban expansion is almost always over the best agricultural land, because it is usually easy land... more Urban expansion is almost always over the best agricultural land, because it is usually easy land to build on. This takes away the most suitable soils from agriculture. Urban and industrial developments sometimes compete with agriculture for scarce water resources, with agriculture generally being the loser. Felling and over-exploitation of forests for urban and industrial development destroys natural ecological balance. Intensive agriculture destroys the natural ecology by replacing diversity with mono-cultures, and by the use of pesticides and herbicides. Wetland and coastal reclamation destroys an ecology that is impossible to replace, and bring harm to the sensitive ecosystems. An urban environment is complex primarily because of rapidly changing variables such as socio-economic and demographic indicators, land-use patterns, resource demand and utilization patterns, lifestyle changes etc. In the light of climate change, a new layer of uncertainty is added in terms of changes in ...
To assess the techno-economic screening of HTL oil for various feedstock, it is crucial to have i... more To assess the techno-economic screening of HTL oil for various feedstock, it is crucial to have information on molecular composition of the feed and products. There are limitations of existing analytical methods to identify and quantify all the molecules present in the bio-fuel. Therefore, there is a need to find alternate ways to quantify the molecular composition of feed and expected products. The modelling work on bio-oil is developed based on a mathematical approach using simple analytical results like CHNO along with structural analysis of oil like FTIR, NMR analysis for HTL derived oil from microalgae. This mathematical framework is further extended to predict the molecular composition of HTL-oil obtained from feedstocks like mixed plastic waste, sludge etc. A multi-dimensional molecular matrix is developed based on the distributions of side chains, aromatic rings, and olefinic carbon on top of core molecules. Optimum parameters are found using appropriate optimization algorit...
Frontiers in Medicine, 2020
In South Korea, the first confirmed case of coronavirus 2019 (COVID-19) was detected on January 2... more In South Korea, the first confirmed case of coronavirus 2019 (COVID-19) was detected on January 20, 2020. After a month, the number of confirmed cases surged, as community transmission occurred. The local hospitals experienced severe shortages in medical resources such as mechanical ventilators and extracorporeal membrane oxygenation (ECMO) equipment. With the medical claims data of 7,590 COVID-19 confirmed patients, this study examined how the demand for major medical resources and medications changed during the outbreak and subsequent stabilization period of COVID-19 in South Korea. We also aimed to investigate how the underlying diseases and demographic factors affect disease severity. Our findings revealed that the risk of being treated with a mechanical ventilator or ECMO (critical condition) was almost twice as high in men, and a previous history of hypertension, diabetes, and psychiatric diseases increased the risk for progressing to critical condition [Odds Ratio (95% CI), 1...
International Journal of Computer Applications, Sep 10, 2010
A number of active queue management algorithms for TCP/IP networks such as RED, SRED, DRED and SD... more A number of active queue management algorithms for TCP/IP networks such as RED, SRED, DRED and SDRED have been proposed in the past few years. This article presents a comparative study of these algorithms using simulations. The evaluation is done using the OPNET Modeler, which provides a convenient and easy-touse platform for simulating largescale networks. The performance metrics used in the study are queue size, packet drop probability, and packet loss rate. The study shows that, among the four algorithms, SRED and DRED are more effective at stabilizing the queue size and controlling the packet loss rate while maintaining high link utilization. The benefits of stabilized queues in a network are high resource utilization, bounded delays, more certain buffer provisioning, and traffic-load-independent network performance in terms of traffic intensity and number of TCP connections.
As part of the resource allocation mechanisms, each router must implement some queuing discipline... more As part of the resource allocation mechanisms, each router must implement some queuing discipline that governs how packets are buffered while waiting to be transmitted. Various queuing disciplines can be used to control which packets get transmitted (bandwidth allocation) and which packets get dropped (buffer space). The queuing discipline also affects the latency experienced by a packet, by determining how
Urban expansion is almost always over the best agricultural land, because it is usually easy land... more Urban expansion is almost always over the best agricultural land, because it is usually easy land to build on. This takes away the most suitable soils from agriculture. Urban and industrial developments sometimes compete with agriculture for scarce water resources, with agriculture generally being the loser. Felling and over-exploitation of forests for urban and industrial development destroys natural ecological balance. Intensive agriculture destroys the natural ecology by replacing diversity with mono-cultures, and by the use of pesticides and herbicides. Wetland and coastal reclamation destroys an ecology that is impossible to replace, and bring harm to the sensitive ecosystems. An urban environment is complex primarily because of rapidly changing variables such as socio-economic and demographic indicators, land-use patterns, resource demand and utilization patterns, lifestyle changes etc. In the light of climate change, a new layer of uncertainty is added in terms of changes in ...