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라비꾸마르란잔 ( Ravi Kumar Ranjan ),김형주 ( Hyung-joo Kim ) 국제한국어교육학회 2016 한국어 교육 Vol.27 No.2
This article about error analysis of beginner level Indian students. It is inevitable for learners to make mistakes. Teachers should recognize the errors which appear in the data and make sure that learners do not repeat same error again. Not only teachers but learners should also identify their mistakes and recognize their weak area and find out what and how to learn. Error analysis is a theory to collect and analyze errors of the learner. An efficient way to teach learner can be designed based on the findings of the analysis. This paper collects writing data of beginner level learners of India who are learning Korean language as a foreign language and then classifies errors into different types. In this paper, I have focused on the written material of the beginners level learners of Korean language in India and found out that most of the errors done by these learners are preposition errors. Other errors which are frequently done by these learners are related to noun, verb, adjective, final ending, connecting endings. Result of the analysis shows that errors related to preposition were 32.37%, errors related to Noun were 15.23%, errors related to verb were 8.84% and errors related to sentence ending figured 8.94% of the total errors examined. After rigorous and careful analysis of these errors, it can be said that the next challenge is to devise a teaching method plan to target Indian learners utilizing these errors. There is a need to provide teaching-learning method for beginner learners in India keeping in mind the question that “What should be the effective way to teach Korean vocabulary or grammar to beginner level learners of Korean language in India?”
Undescended cecum with accessory right colic artery: a rare case report
Praveen Kumar Ravi,Manisha Rajanand Gaikwad,Pravash Ranjan Mishra,Naina Santosh Wakode,Prabhas Ranjan Tripathy,E. Tripati Patro,Babita Kujur,Santosh Laxman Wakode 대한해부학회 2017 Anatomy & Cell Biology Vol.50 No.3
Midgut malrotation and incomplete rotation are common causes of neonatal intestinal obstruction. At end of 10 week of intrauterine life, cecum will be placed in subhepatic region temporarily and descends to right lower quadrant by eleventh week. Arrest of cecum in subhepatic region or undescended cecum is a rare congenital anomaly of mid gut. Usually, it remains asymptomatic and is diagnosed incidentally. If any pathology occurs in anomalous part, like appendicitis then the diagnosis and treatment will be challenging in all age groups. Variation in blood supply have also been reported with anomalies leading to iatrogenic injuries during colonoscopy and surgeries. Lack of knowledge of these rare variations may lead to delayed diagnosis of appendicitis leading to perforation and surgical emergencies. In the present case, we describe an undescended cecum and its associated variation in branching pattern of superior mesenteric artery.
Estimating Normalized Attention of Viewers on Account of Relative Visual Saliency of Faces (NRVS)
Ravi kant kumar,Jogendra Garain,Goutam Sanyal,Dakshina Ranjan Kisku 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.7
Humans psychological and behavioral understanding often lead to make natural decision which accurately identifies and remembers the faces which are highly appreciated or criticized by themselves in comparing to the normal viewed faces, in terms of beauty, ugliness or unique appearance. It happens due to human psychology of being biased towards the salient face in the process of face recognition and identification. This paper attempts a novel method to measure, how our attention is more restricted towards some particular faces in the crowd. This restricted attention is strongly guided by the relative visual saliency of these faces. In this paper, normalized relative visual saliency (NVRS) of the faces is evaluated using their intensity values modulated with respective spatial distance. Experiment has been carried out on test image dataset via bottom up approach. The experimental results are found to be encouraging and accuracy has also been measured exhibiting efficacy of the proposed approach.
Ranjan Dutta,Dikhi Firmansyah,유재덕,Ravi Kumar,Endale Mulugeta Beza,조홍일,옥강민,이창희 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.10
A series of carbazole–benzimidazole conjugates and corresponding BF2-complexes (BODIPYs) are synthesized and characterized. Carbazole–benzimidazole conjugates are synthesized by the condensation of 1-formyl carbazole and phenylene diamines in good yields. Various substituents are introduced into the benzimidazole moiety and subsequent reaction with BF3•Et2O afforded the BF2-complexes in moderate to good yield. The structural and photophysical properties of the synthesized fluorophores are investigated with various spectroscopic techniques such as UV/Vis and fluorescence spectroscopy, cyclic voltammetry and X-ray crystallography.
Rahul Kumar Sharma,Abhishek Purohit,Venkatesan Somasundaram,Pravas Chandra Mishra,Mrinalini Kotru,Ravi Ranjan,Sunil Kumar,Sudha Sazawal,Hara Prasad Pati,Seema Tyagi,Renu Saxena 대한혈액학회 2014 Blood Research Vol.49 No.4
Background Aberrant myeloid antigen (MA) co-expression and high expression of CD34 antigen on the blasts of acute lymphoblastic leukemia (ALL) patients are independently reported to have a role in pathogenesis and prognosis. This study was conducted to determine whether these two parameters are related. Methods A total of 204 cases of ALL were included in an analysis of blast immunophenotypic data. CD34 expression was categorized as low when less than 50% of blasts were CD34-positive (CD34low) and as high when 50% or more were CD34-positive (CD34high). Results Of 204 cases of ALL, 163 and 41 were of B-cell origin (B-ALL) and T-cell origin (T-ALL), respectively. Of all cases, 132 (64.7%) showed co-expression of MA and among these, 101 (76.51%) were CD34high, while the remaining 31 (23.48%) were CD34low. Of 72 cases without MA co-expression, 25 (34.72%) were CD34high and 47 (67.25%) were CD34low. Furthermore, of 163 cases of B-ALL, 111 showed co-expression of MA and 84 of these were CD34high. Of 52 cases of B-ALL without MA expression, 22 were CD34high. Among 41 cases of T-ALL, 21 co-expressed MA, 17 of which were CD34high. Moreover, all 20 cases of T-ALL without co-expression of MA were CD34low. These differences were statistically significant. Conclusion We observed a strong correlation between aberrant MA expression and CD34high expression on the blasts of ALL. We hypothesize that these different patient subsets may represent unique prognostic characteristics.
Rahul Kumar Sharma,Abhishek Purohit,Venkatesan Somasundaram,Pravas Chandra Mishra,Mrinalini Kotru,Ravi Ranjan,Sunil Kumar,Sudha Sazawal,Hara Prasad Pati,Seema Tyagi,Renu Saxena 대한혈액학회 2014 Blood Research Vol.49 No.4
Background Aberrant myeloid antigen (MA) co-expression and high expression of CD34 antigen on the blasts of acute lymphoblastic leukemia (ALL) patients are independently reported to have a role in pathogenesis and prognosis. This study was conducted to determine whether these two parameters are related. Methods A total of 204 cases of ALL were included in an analysis of blast immunophenotypic data. CD34 expression was categorized as low when less than 50% of blasts were CD34-positive (CD34low) and as high when 50% or more were CD34-positive (CD34high). Results Of 204 cases of ALL, 163 and 41 were of B-cell origin (B-ALL) and T-cell origin (T-ALL), respectively. Of all cases, 132 (64.7%) showed co-expression of MA and among these, 101 (76.51%) were CD34high, while the remaining 31 (23.48%) were CD34low. Of 72 cases without MA co-expression, 25 (34.72%) were CD34high and 47 (67.25%) were CD34low. Furthermore, of 163 cases of B-ALL, 111 showed co-expression of MA and 84 of these were CD34high. Of 52 cases of B-ALL without MA expression, 22 were CD34high. Among 41 cases of T-ALL, 21 co-expressed MA, 17 of which were CD34high. Moreover, all 20 cases of T-ALL without co-expression of MA were CD34low. These differences were statistically significant. Conclusion We observed a strong correlation between aberrant MA expression and CD34high expression on the blasts of ALL. We hypothesize that these different patient subsets may represent unique prognostic characteristics.
Jogendra Garain,Ravi Kant Kumar,Goutam Sanyal,Dakshina Ranjan Kisku 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.6
Selection of cohort models plays a vital role to increase the accuracy of a biometric authentication system as well as to reduce the computational cost. This paper proposes a novel approach for cohort selection called Max-Min-Centroid-Cluster (MMCC) method. The clusters of cohorts are generated by K-means clustering technique. The union of the clusters having largest and smallest centroid value is taken as cohort subset. The cohort scores, after normalization using different cohort based score normalization techniques, are used in authentication process of the system. Evaluation has been carried out on FEI face datasets. The performance of this novel methodology is analyzed using T-norm and Aggarwal (max rule) normalization techniques. Experimental results exhibit the efficacy of the proposed method.
Performance Analysis of Normally-on Dual Gate Algan/Gan Hemt
Manisha Rao,Ravi Ranjan,Nitesh Kashyap,Rakesh Kumar Sarin 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.5
This paper presents the novel normally-on dual gate (DG) AlGaN/GaN high electron mobility transistor. At high frequency, the dual gate structure gives superlative immunity over short channel eff ects. Multiple 2DEG channel regions in dual gate AlGaN/GaN HEMT improves the transport characteristics, charge control and gives better linearity. The high carrier mobility and electron saturation velocity contribute to the high switching frequency of DG HEMT. The drain characteristics of single gate HEMT and dual gate HEMT are compared and DG HEMT outstands in drain current. The various analog and linearity parameters are investigated for DG HEMT. The performance analysis provides better transconductance, capacitance, cut off frequency, subthreshold slope and on-resistance simulations represents the potential of DG HEMT. The DG HEMT provides 1100 mA/mm I ON , 550 mS/mm transconductance and 11 GHz cutoff frequency at V gs = 2 V. The high drain current, better transconductance and cutoff frequency results in better sensitivity of device.
Puja Kumari,Chandrashekhar Azad,Ravi Ranjan Kumar,Jyoti Kumari,Kumar Aditya,Amarendra Kumar 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.2
Spot blotch disease of wheat caused by Bipolaris sorokiniana (Sacc.) Shoem is considered as an economically important disease which affects all the growing stages of wheat crop. Therefore, it is important to search some effective management strategies against the spot blotch pathogen. Some synthetic elicitor compounds (salicylic acid, isonicotinic acid, and chitosan) and nano-particles (silver and aluminum) were tested against the pathogen to observe the change in biochemical activity and defense action of wheat plant against spot blotch disease. All the tested elicitor compounds and nano-particles showed a significant increase in activity of peroxidase, polyphenol oxidase (PPO), and total phenol over control. The highest increase in activity of peroxidase was recorded at 72 h from chitosan at 2 mM and 96 h from silver nano-particle at 100 ppm. Maximum PPO and total phenol activity were recorded from chitosan at 2 mM and silver nano-particle at 100 ppm as compared to pathogen-treated and healthy control. The lowest percent disease index, lowest no. of spots/leaf, and no. of infected leaves/plant were found in silver nano-particle at 100 ppm and chitosan at 2 mM, respectively. The use of defense inducer compounds results in significantly up-regulated enzymatic activity and reduced spot blotch disease. Therefore, chitosan and silver nanoparticle could be used as alternative methods for the management of spot blotch disease.
Design and Investigation of Dual Dielectric Recessed-Gate AlGaN/GaN HEMT as Gas sensor Application
Ashish Raman,Soumya Prasanna Chattopadhyay,Ravi Ranjan,Naveen Kumar,Deepti Kakkar,Rajneesh Sharma 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.6
This paper presents a highly sensitive Recessed Gate/source/drain AlGaN/GaN HEMT (RG-AlGaN/GaN HEMT) based Carbon Monoxide gas sensors. Many types of Carbon Monoxide (CO) gas sensor have already been demonstrated experimentally. The deeply etched recessed gate based HEMT form highly sensitive 2DEG for small change in gate metal oxide. Copper Oxide and Cerium Oxide are used as a gate electrode in CO gas detection and these metal oxides are reactively sensitive to CO gas molecules. Because of the change in the work function of gate metal oxide due to the presence of gas deposition on it, there is the change in I off , I on , SS and V th which can be taken as sensitivity parameter for sensing the gas molecules. For a change in work function till 700meV using various steps sizes, RG-AlGaN/GaN HEMT based CO gas sensor shows highly sensitivity with respect to device characteristics parameters.