Evaluating the performance of map matching algorithms for navigation systems: an empirical study

Jaiteg Singh,Saravjeet Singh,Sukhjit Singh,Hardeep Singh 대한공간정보학회 2019 Spatial Information Research Vol.27 No.1

Navigation systems are extensively used for location identification and route finding. The efficiency of navigation systems is highly affected by map matching algorithms. This paper provides a review of major map matching algorithms. The performance of reviewed algorithms was further evaluated with the help of an empirical study. A dataset of forty seven kilometers was collected to deploy various map matching algorithms so as to measure their performance. A comparison of geometric, topological and Kalman filter based map matching algorithms was performed on the same dataset. It was concluded that performance of Kalman filter algorithm provide better results in comparison to geometrical and topological algorithms.

Antioxidant Properties of Sand Roasted and Steam Cooked Bengal Gram (Cicer arietinum)

Hardeep Singh Gujral,Paras Sharma,Ritupriya Sharma 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.suppl1

Nine different Bengal gram (Cicer arietinum)cultivars were subjected to sand roasting and steam cooking and the effect on antioxidant properties were evaluated. The control untreated Bengal gram cultivars varied significantly with respect to their antioxidant properties. Both the thermal treatments lead to a significant increase in total phenolic content of up to 54% upon roasting and 97% upon steam cooking, respectively. Similarly, a significant increase in antioxidant activity was also observed by roasting (up to 64.5%) and steam cooking (up to 225%). A significant decrease in total color difference was noticed upon roasting (up to 11%) and steam cooking (up to 21%). The reducing power was increased significantly after roasting and steam cooking,however, steam cooking brought about greater increase in reducing power (up to 109%). Metal chelating activity was increased by up to 91.5% upon roasting and steam cooking. The study revealed that the steam cooking brought about greater increase in total phenolic content,reducing power, and metal chelating activity as compared to roasting.

Antioxidant Properties of Legumes and Their Morphological Fractions as Affected by Cooking

Hardeep Singh Gujral,Paras Sharma,Neha Gupta,Ali Abbas Wani 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.1

The antioxidant properties of 6 legumes: green gram (Vigna radiate), red kidney beans (Phaseolus vulgaris),chickpea (Cicer arietinum), red lentil (Lens esculenta),soybean (Glycine max), and moth beans (V. aconitifolia),and their morphological fractions were evaluated before and after cooking. Kidney beans had the highest total phenolic content (8.9 mg ferulic acid equivalents/g), DPPH free radical scavenging activity (38.1%), reducing power (85.5 μmol ascorbic acid equivalents/g), and total flavonoid content (0.9 mg catechin equivalents/g). Highest metal chelating activity was observed for moth beans (93.3%). The antioxidant properties of the seed coat in all the legumes were manifold higher as compared to the whole legume or its respective endosperm and removal of the seed coat significantly reduced the antioxidant activity. Although cooking brought about a reduction in the antioxidant activity of the legumes in majority of the legumes and their fractions, an increase in the metal chelating activity was observed.

Challenges in Microsurgical Free Tissue Transfer for a 1-Year-Old Child

Hardeep Singh,Rakesh Kumar Khazanchi,Sanjay Mahendru,Ankit Jain 대한창상학회 2020 Journal of Wound Management and Research Vol.16 No.2

Challenges faced during complex reconstructions in the pediatric age group are rarely discussed in literature. This study is to share our experience in a 1-year-old patient. The patient had an exposed knee joint following trivial trauma, which was resurfaced with a free latissimus dorsi flap. On the patient’s 5th day in the ward, the flap was discolored and inadequate perfusion was noted. The patient also had loose stools overnight. Before she was re-examined, the dressings were loosened and the patient was kept warm and was started on intravenous fluids. When examined in the operating room, the vascularity of the flap had improved without any intervention. The monitoring skin paddle necrosed while the muscle survived. The patient then underwent skin grafting and had uneventful recovery. The postoperative monitoring in children is critical as they have poor reserves and are prone to complications. We believe pediatric microsurgery should be done in specialized microsurgical centers that also have good intensive care units.

Hatchet Thigh Flap with Hemi-gluteus Flap for Recurrent Ischial Sore Reconstruction

Hardeep Singh,Ankit Jain,Sanjay Mahendru,Rakesh Kumar Khazanchi 대한창상학회 2020 Journal of Wound Management and Research Vol.16 No.3

Background: Ischial pressure sores are the most challenging sores to treat because of associated bursa and high rate of recurrence. Reconstruction flaps originating in the thigh have a disadvantage as movement may increase shear forces, and tension during closure may lead to wound dehiscence. To circumvent these problems, we hereby present a hatchet thigh flap with good mobility, which can be used for recurrent cases as well.Methods: All patients treated at our hospital in the last 5 years for ischial pressure sores were included in the study. The flap is elevated in the subfascial plane from lateral to medial until the medial circumflex artery perforators are revealed. In recurrent cases the lower half of the gluteus maximus muscle is used to fill in the cavity while the flap from the previous surgery is re-advanced.Results: Sixteen patients (11 males and five females) were in the study. The median age of the patient was 54 years (range, 25–82 years). All the flaps survived fully. Two patients had recurrence at three sites, which were successfully reconstructed by advancing the same flap and hemi-gluteus muscle. An average of 6 months follow-up after surgery for recurrence showed stable reconstruction.Conclusion: The hatchet thigh flap is easy to dissect and reliable for ischial pressure sores. It can be used effectively in recurrent cases when combined with hemi-gluteus flaps.

Complete Bony Segment Flap Failure without Skin Paddle Compromise in Fibular Free Flap: A Case Report of a Rare Early Complication

Singh Hardeep,Jain Ankit,Jain Rahul,Mahendru Sanjay,Khazanchi Rakesh Kumar 대한창상학회 2023 Journal of Wound Management and Research Vol.19 No.1

The free fibula flap is sometimes associated with partial flap loss. A 62-year-old man with squamous carcinoma of the lower alveolus underwent anterior arch resection and reconstruction with a fibula osteocutaneous flap containing three bony segments. There were two perforators in the skin flap; the first perforator was proximal to the bony segments and the other perforator was at the level of the middle segment. Atherosclerosis was observed in the anastomotic vessels. During surgery, thrombosis occurred in the arterial anastomosis, but was revised before the operation was over. The patient’s early postoperative course was uneventful. In the second week, purulent discharge was observed from the drains. Flap exploration showed devascularization of bony segments and periosteum, but the skin paddle was viable. The peroneal vessel had thrombosed distal to the takeoff of the proximal perforator and the viable skin paddle perfused by proximal perforators falsely indicated the well-being of underlying bones. The de-vascularized bones and sloughed periosteum were removed at the time of exploration, after which the skin paddle was reoriented for coverage of the defect. The patient completed chemoradiation without any bony reconstruction afterwards. This is the only reported case of early total bony flap portion loss with a viable skin paddle in free fibula flap transfer.

Extending QGIS processing toolbox for assessing the geometrical properties of OpenStreetMap data

Sukhjit Singh Sehra,Jaiteg Singh,Sumeet Kaur Sehra,Hardeep Singh Rai 대한공간정보학회 2023 Spatial Information Research Vol.31 No.2

OpenStreetMap (OSM) offers an under-explored crowdsourced geospatial data useful to urban street network researchers for assessing the geometrical properties of spatial data. Urban street network analysis can provide the assessment of spatial dataset through these properties. The lack of a suitable evaluation framework renders problem for its potential users to evaluate the geometrical properties of the data. To overcome this difficulty, the capability of processing toolbox of QGIS has been extended by developing processing scripts using Python. These scripts were further used as components in the graphical modeler. The parameters such as degree centrality, average path length, closeness centrality, betweenness centrality, clustering coefficient, and inter-network indicators are developed to provide insights to the overall nature of the spatial data. For performing the empirical analysis, OSM dataset of five biggest cities of state of Punjab (India) have been analyzed and compared temporally. The results presented the internal geometrical feature’s evaluation of street network in temporal comparison of OSM dataset and its credibility. This study provided the basis for reproducible research by developing components for open source software QGIS. The developed model can be used to asses the geometrical properties assessment by the town planners to identify the prominent nodes, edges and their relationships in the datasets.

On the Optical Properties of Ag+15 Ion-beam-irradiated TiO2 and SnO2 Thin Films

Hardeep Thakur,K. K. Sharma,Ravi Kumar,Pardeep Thakur,Yogesh Kumar,Abhinav Pratap Singh,Sanjeev Gautam,채근화 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10

The effects of 200 MeV Ag⁺¹⁵ ion irradiation on the optical properties of TiO₂ and SnO₂ thin films prepared by RF magnetron sputtering technique were investigated. These films were characterized by the UV-vis spectroscopy and it was observed that with increase in irradiation fluence the transmittance for the TiO₂ films systematically increases while that for SnO₂ decreases. Absorption spectra of the irradiated samples showed a minor changes in indirect bandgap from 3.44 to 3.59 eV for TiO₂ while that for SnO₂ significant modifications in the direct bandgap from 3.92 to 3.6 eV were observed on increasing irradiation fluence. The observed modifications in the optical properties of both TiO₂ and SnO₂ systems with irradiation can be attributed to controlled structural disorder/defects in the system.

Modifications in structural and electronic properties of TiO₂ thin films using swift heavy ion irradiation

Thakur, Hardeep,Kumar, Ravi,Thakur, P.,Brookes, N. B.,Sharma, K. K.,Pratap Singh, Abhinav,Kumar, Yogesh,Gautam, S.,Chae, K. H. American Institute of Physics 2011 JOURNAL OF APPLIED PHYSICS - Vol.110 No.8

A Review of Cloud Computing Security Issues

Manpreet Kaur,Hardeep Singh 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.5

Cloud Computing is an emerging paradigm which has become today’s hottest research area due to its ability to reduce the costs associated with computing. In today’s era, it is most interesting and enticing technology which is offering the services to its users on demand over the internet. Since Cloud computing stores the data and its disseminated resources in the environment, security has become the main obstacle which is hampering the deployment of cloud environments. There are number of users used cloud to store their personal data, so that data storage security is required on the storage media. The major concern of cloud environment is security during upload the data on cloud server. Data storage at cloud server attracted incredible amount of consideration or spotlight from different communities. For outsourcing the data there is a need of third party. The importance of third party is to prevent and control unauthorized access to data store to the cloud. This research paper discusses the security issues of cloud storage.