Blending of Contrast Enhancement Techniques for Underwater Images

Abin, Deepa,Thepade, Sudeep D.,Maitre, Amulya R. International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.1

Exploration has always been an instinct of humans, and underwater life is as fascinating as it seems. So, for studying flora and fauna below water, there is a need for high-quality images. However, the underwater images tend to be of impaired quality due to various factors, which calls for improved and enhanced underwater images. There are various Histogram Equalization (HE) based techniques which could aid in solving these issues. Classifying the HE methods broadly, there is Global Histogram Equalization (GHE), Mean Brightness Preserving HE (MBPHE), Bin Modified HE (BMHE), and Local HE (LHE). Each of these HE extensions have their own pros and cons and thus, by considering them we have considered BBHE, CLAHE, BPDHE, BPDFHE, and DSIHE enhancement algorithms, which are based on Mean Brightness Preserving HE and Local HE, for this study. The performance is evaluated with non-reference performance measures like Entropy, UCIQE, UICM, and UIQM. In this study, we apply the enhancement algorithms on 300 images from the UIEB benchmark dataset and then apply the techniques of cascading fusion on the best-performing algorithms.

Magnetization of the stack of HTS tapes

Osipov, M.A.,Abin, D.A.,Pokrovskiy, S.V.,Mineev, N.A.,Rudnev, I.A. The Korea Institute of Applied Superconductivity a 2015 한국초전도저온공학회논문지 Vol.17 No.1

New results of dependence of magnetic field, trapped by a stack of HTS tapes, on amount of tapes in a stack are reported. Commercial GdBCO tape 12 mm width and without Cu layer was used for the research. Tape was divided in square pieces $12{\times}12mm^2$ from which stacks were formed. Filling factor of the tape was about 1.4%. Measurements were carried out for stacks with height from 5 to 250 pieces and at wide temperature range from liquid helium to liquid nitrogen. Both FC (field cooling) and ZFC (zero field cooling) cooling methods were used in the research. These two methods show matching results with good accuracy. As a result dependences of trapped magnetic flux on amount of tapes for different temperatures were received. Research shows, that with increasing height of the stack trapped magnetic field value reach saturation at about 60 tapes in a stack for low temperatures. From 60 to 100 tapes increase of magnet flux is only 5%. Thus increase amount of tapes in a stack is not profitable. Also investigation of trapped magnet field relaxation was carried out. Relaxation speed decreases with increasing amount of elements. It means that the higher the stack is, the longer trapped flux will be held in cause of the same temperature.

Manufacture and Performance of Textile-ramie Fiber Reinforced Anionic Polyamide 6 Composites

Hao Shi,Lijian Xia,Zonglei Guo,Abin Sun,Hui Wang,Ze Kan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8

A vacuum assistant resin infusion moulding (VARIM) was adopted to prepare a new-style and environmentalfriendly thermoplastic composite consisting of anionic polyamide-6 (APA-6) and textile-ramie fiber. However, the intensivepolymerization-inhibition and fiber-discoloration phenomena were found in the reactive processing. In order to overcomethese problems, two methods were used to suppress the reaction between the ramie fiber and APA-6, which are the surfacemodification of ramie fiber and a new initiator with a low activity. Finally, the inhibition and discoloration phenomena weresuppressed significantly, which overcame the major challenge during the preparation of ramie fiber reinforced APA-6composites by reactive processing. The composites showed a good polymerization during VARIM process. The tensilestrength and flexural modulus of the obtained composites were increased by 21 % and 26 % respectively compared with thatof pure APA-6. It is important to find that there were some interactions between APA-6 and ramie fiber, which produced agood interface characters. This work not only opens new avenues for the development of renewable composites, but alsofurther broadens the applications of the natural fibers.

Magnetization of the stack of HTS tapes

M.A. Osipov,D.A. Abin,S.V. Pokrovskiy,N.A. Mineev,I.A. Rudnev 한국초전도저온학회 (구 한국초전도저온공학회) 2015 한국초전도저온공학회논문지 Vol.17 No.1

Numbness Following Total Knee Arthroplasty: Role of Incision Length And Position - A Randomized Study

Vikas Kulshrestha,Munish Sood,Santhosh Kumar,Pardeep Kumar,Abin Stanley,Prashanth P Padhi,Saurabh Sharma 대한정형외과학회 2023 Clinics in Orthopedic Surgery Vol.15 No.1

Background: One of the symptoms annoying patients after total knee replacement (TKR) is numbness around the operative scar. Some studies have shown that altering the incision in terms of placement or length may decrease the incidence of numbness. It still remains unknown whether numbness affects patient-reported outcomes. Methods: We conducted a randomized study to compare a short-length incision (n = 50) and a lateral exit incision (n = 50) with a standard midline TKR incision (n = 50) in terms of the incidence of numbness and its progress over 1 year of follow-up. Our secondary objective was to look at the involved zone, area of numbness, and secondary symptoms. We also looked at patient-reported outcome in terms of satisfaction in all groups using a visual analog scale and Forgotten Joint Score. Results: At 3 months postoperatively, the incidence of numbness was least in the lateral exit group: 46.2% as compared to midline (62%) and short (58.3%), but the difference was not significant (p = 0.07). At 6 months, the short incision group had a significantly lower incidence (8%) of residual numbness as compared to 30% in the other two groups (p = 0.003). At 1 year, most patients recovered sensation loss and had similar function. Conclusions: Placement or length of an incision did not significantly affect the incidence of numbness; however, the short incision led to early recovery of numbness. At 1 year of follow-up, most patients did not complain of loss of sensation and had similar functional outcome.

Early Outcomes of Dual-Pivot Total Knee Replacement Compared to an Ultracongruent Design

Vikas Kulshrestha,Munish Sood,Santhosh Kumar,Pardeep Kumar,Abin Stanley,Prashanth P Padhi 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.4

Background: With a quest to optimize outcomes, there have been significant advancements in modern designs of total knee implants, attempting to mimic the natural knee motion and feel. One such new design reproducing the medial and lateral knee pivot is a dual-pivot (DP) knee. In the present study, we endeavored to compare the performance of the DP knee vis-a-vis an ultracongruent (UC) Knee design. Methods: This prospective cohort study was performed in a joint replacement center of a tertiary care military hospital. We enrolled 50 patients each in the DP knee group and the UC knee group and assessed knee flexion, patient-reported outcome (new Knee Society Score [nKSS]), patient performance (Delaware Osteoarthritis Profile Score), and function (Forgotten Joint Score [FJS]) at 2 years of follow-up. Results: The nKSS was similar in the two groups. In the DP group, patients had significantly better improvement in the stair climb test (p = 0.026). In the UC group, timed up and go test was significantly better (p = 0.004). The gain in knee flexion was similar in the two groups: 26.3° ± 23.3° in the DP group and 27.5° ± 27.5° in the UC group (p = 0.930). Return to activity as judged by 2-year FJS was similar in both groups (p = 0.687). Conclusions: Our study showed that the DP knee design had similar knee function to the UC knee. The DP knee design had significantly better stair climbing ability, whereas getting up from chair was better in the UC knee design. With comparable patientreported outcome and possible differences in patient performance in terms of day-to-day activities, any future trial should focus on comparing patient performance.

Trace elements in the soil-plant interface: Phytoavailability, translocation, and phytoremediation–A review

Antoniadis, Vasileios,Levizou, Efi,Shaheen, Sabry M.,Ok, Yong Sik,Sebastian, Abin,Baum, Christel,Prasad, Majeti N.V.,Wenzel, Walter W.,Rinklebe, Jö,rg Elsevier 2017 Earth-science reviews Vol.171 No.-

<P><B>Abstract</B></P> <P>Trace elements (TEs) are deposited to soils mainly due to anthropogenic activities and pose a significant threat to human health. In this review we aimed at (a) discussing the phytoavailability of TEs as affected by various soil parameters, and by plant defense mechanisms related to uptake and translocation; (b) examining soil and plant indices related to TE phytoavailability; (c) clarifying the challenges and problems related to phytoremediation; and (d) exploring the often encountered discrepancies of lower-than-expected TE toxicity. We particularly discussed the soil-to-plant availability index (transfer coefficient, <I>TC</I>), because it encompasses all soil and plant factors related to TE phytoavailability. As for soil, we explored the effect of pH, redox potential, clay and organic matter contents, as well as aging of added elements. The latter is a key factor in interpreting the observed lower-than-expected toxicity to plants in real field conditions. This is because the discrepancy is very often generated by growth experiments that expose plants to TEs directly from TE-laden solutions or by studies that spike soils with TEs only days or weeks before planting. Also, the behavior of TEs depends on the nature and quantity of TEs. As for plant, TE absorption or exclusion is highly related to species-specific defense mechanisms developed by plants so that they are exposed to TE-induced stress. These mechanisms address TE exposure by operating both outside and inside the plant body; outside with the assistance of root exudates, and the rhizosphere microflora, and inside with selective translocation and storage processes. The absorption/exclusion behavior of plants also depends on root activities and related soil chemical processes which are highly localized within a spatial scale of a few mm from roots. Novel techniques for the imaging of TE biogeochemistry at the root-soil interface are therefore addressed and their explanatory power is demonstrated. Such plant behavior greatly affects phytoremediation, a process which also depends on the maximal TE uptake capacity of plants, especially of hyperaccumulators. However, phytoremediation also greatly depends on plant biomass yield, an important factor in determining the time required to complete the procedure. In conclusion, soil factors, as well as plant- and TE- related issues, may create discrepancies in TE phytoavailability and phytoremediation that need to be thoroughly understood and addressed.</P>

Air quality disturbance zone mapping in greater Cochin region of Kerala state, India using geoinformatics

Naveen S. Lal,John Richard Thomas,Sumith Satheendran,Abin Varghese,Usha K. Aravind,C.T. Aravindakumar 대한공간정보학회 2020 Spatial Information Research Vol.28 No.6

Air quality disturbance zones of the Greater Cochin region (Kerala, India) for the years 2014, 2015, 2016 and 2017 along with air quality assessment and dispersion modelling using in situ measurements and mathematical models, have been investigated in this report. Landsat-8 satellite with OLI and TIRS sensors on board were used for the analysis. The ground based in situ measurements (pollutant parameters) were also obtained from the Kerala state pollution control board. Zonal statistics analysis was performed in various combinations especially air quality disturbance zones with respect to land use/land cover and administrative units for various years. The air quality disturbance zone index (AQDZI) values observed indicated that 38.16% of the study area in 2014 belonged to very good category, 22.94% to good category, 32.37% to moderate category and 6.53% to poor category. In 2015, 56.78% of study area belonged to very good category and 43.221% to good category while in the year 2016 very good category of AQDZI values occupied an area of 45.284% and good category AQDZI values occupied an area of 54.72%. In 2017, 99.834% of the study area belonged to good category and 1.233% to moderate category. Results obtained from zonal statistics revealed that the poor air quality was observed in built up area and good air quality at rubber plantation in all the four selected years. In the case of administrative units, Kochi Corporation experienced poor air quality during all the years studied and Mulanthuruthy grama-panchayath experienced good air quality during most of the years except in 2016.

차세대 리튬이차전지를 위한 산화물 고체전해질의 연구동향

강병우(Byoungwoo Kang),박희택(, Heetaek Park),우승준(Seungjun Woo),강민석(Minseok Kang),김아빈(Abin Kim) 한국세라믹학회 2018 세라미스트 Vol.21 No.4

Since the electrification of vehicles has been extended, solid-state batteries have been attracting a lot of interest because of their superior safety. Especially, polymer, sulfide, and oxide based materials are being studied as solid electrolytes, and each type of materials has advantaged and disadvantages over others. Oxide electrolytes has higher chemical and electrochemical stability compared to the other types of electrolytes. However, ionic conductivity isn’t high enough as much as that of organic liquid electrolytes. Also, there are many difficulties of fabricating solidstate batteries with oxide based electrolytes because they require a sintering process at very high temperature (above ~800 ℃). Herein, we review recent studies of solid-state batteries with oxide based electrolytes about the ionic conductivity, interfacial reactions with Li metal, and preparation of solid-state cell.