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- 저자 : Jha, Anal K. (검색결과 316 건)
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J. HA,허훈,J. H. SONG,J. H. LIM 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.1
This paper proposes a new equivalent failure strength model for spot welds under combined axial and shear loading. To evaluate the pure-shear strength of spot welds fabricated under the same welding conditions with a two-layered lap joint, a test fixture and a specimen were newly designed and proposed. The failure tests of spot welds of TRIP590 1.2t,DP780 1.0t, DP780 1.2t, and DP980 1.2t were carried out at seven different loading angles ranging from 0o to 90o at an internal angle of 15o to obtain the failure loads. The failure loads obtained from the experiments were utilized to construct the failure criterion and thus describe the failure behavior of spot welds in the crash analysis or strength analysis of an auto-body. It is noted that the value of β in the failure criterion for spot welds of AHSS is different from the values of conventional steels. The new equivalent failure strength model proposed in this paper was derived from the failure test results to provide a representative failure model that can be used to accurately compare the failure characteristics of different materials under the same conditions.
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DRAG REDUCTION OF A PICKUP TRUCK BY A REAR DOWNWARD FLAP
J. HA,S. JEONG,S. OBAYASHI 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.3
The drag reduction of a pickup truck by a rear flap add-on was examined through CFD simulations and wind tunnel experiments. When installed at the rear edge of the roof, the flap increased the cabin back surface pressure coefficient, causing the downwash of the bed flow to be inclined on the tailgate. Thus, the attachment of the bed flow to the tailgate was eliminated; consequently, the drag coefficient was reduced with increasing flap length and downward angle despite the enlarged reverse flow in the wake. However, the drag coefficient did not decrease any further after a specific downward angle was reached because the bed flow increased the drag force at the tailgate and the flap lowered the pressure field above the flap. To maximize the drag reduction effect, the rear downward flap should be designed to have an optimum downward angle.
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정신분열병 환자의 임상반응에 따른 혈장 Homovanillic Acid와 혈장 할로페리돌의 변화
구자일,오동열,양병환 大韓神經精神醫學會 1992 신경정신의학 Vol.31 No.1
Nineschizophrenic inpatients were studied under halopendol treatment for the purpose of evaluating the possible correlation between plasma HVA, leuels(P-HVA) plasma halopendol levels (P-haloperidal) and clinical symptom changes. The authors measured plasma HVA and plasma haloperidol levels, and checked BPRS and SAPS scores at baseline, 7th day. 28th day and 56th day of treatment. 1) P-HVA concentrations of total patients were highest on 7th day, then returned to baseline levels on 28th day. but that of drug responder group(6 patients) were highest on pretreatment then decreased below baseline levels on 7th day and continued to decrease till 56th day of treatment. 2) P-HVA concentrations of total patients showed positive correlations with BPRS scores (r=0.28, p<0.l) and-with SAPS scores(r=0.36, p<0.05) and that of drug responder group showed also positive correlations with BPRS scores(r=0.24, p=NS) and with SAPS scores (r=0.45. p<0.0l). 3) P-haloperidol concentrations of total patients showed significant positive correlation with haloperidol doses(r=0.73, p<0.00l) and that of drug responder group showed positive correlation with haloperidol doses(r=0.53. P<0.01). P-haloperidol concentration of drug responder group showed significant negative correlation with BPRS scores(-0.72, P<0.01) and with SAPS scores(-0.59. P<0.001) but that of total patients did not. 4) The haloperidol doses of drug responder group showed meaningful negative correlations with P-HVA(r=-0.38. p=0.03) and with BPRS scores (r=-0.50. P<0.01) and with SAPS scores(r=-0.47. p=0.0l) but that of total patients did not. The authors discussed the meaning of above results.
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Pankaj Kumar Jha,Saroj Sapkota,Neena Amatya Gorkhali,Bhoj Raj Pokharel,Ajeet Kumar Jha,Shishir Bhandari,Bhola Shankar Shrestha 사단법인 한국동물생명공학회 2019 한국동물생명공학회지 Vol.34 No.4
The study was conducted to evaluate the seminal attributes and cryo-banking of Achhami (Bos indicus) bull semen. Of two Achhami bulls, 8 ejaculates from each bull were evaluated for seminal attributes. For semen freezing and cryo-banking, 4 ejaculates (having ≥2 mL semen volume, ≥75% of sperm motility and ≥1,000 × 106 cells/mL of sperm concentration) from each bull were used. Semen samples were diluted in egg-yolk-tris-citrate extender using a two-step dilution protocol, and were frozen in liquid nitrogen (LN2) vapour in a styrofoam box. The mean semen volume, colour, sperm mass activity, motility, viability, concentration, abnormal acrosome, midpiece and tail and, abnormal head of two Achhami bulls were 4.4 ± 0.5 mL vs. 2.5 ± 0.2 mL, 2.5 ± 0.1 vs. 2.4 ± 0.1, 3.5 ± 0.1 vs. 3.5 ± 0.1, 77.0 ± 1.1% vs. 78.3 ± 1.3%, 94.4 ± 0.5% vs. 91.0 ± 0.6%, 1137.7 ± 73.7 × 106 cells/mL vs. 1060.0 ± 44.3 × 106 cells/mL, 10.2 ± 0.5% vs. 10.3 ± 0.5% and 6.7 ± 0.5% vs. 8.2 ± 0.3%, respectively. The post-thawed sperm motility and viability were 53.0 ± 2.0% vs. 50.0 ± 0.0% and 80.2 ± 0.4% vs. 73.2 ± 0.7%, while evaluating by computer-assisted sperm analysis (CASA) system, the percentage of the progressive motility, fast motility, slow motility, local motility and immotile sperm were 75%, 68%, 7.4%, 16.6% and 8.6%, respectively. A total number of 620 doses semen straw were cryo-banked. Due to the acceptable post-thawed sperm motility and viability recorded, cryopreservation of Achhami semen is hereby recommended so as to preserve the Achhami breed. For further validation, the fertility will be observed from the produced frozen semen.
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Priyanka A. Jha,A.K. Jha 한국물리학회 2013 Current Applied Physics Vol.13 No.7
In the present study, structural, dielectric and ferroelectric properties of Ba1-3x/2Yx Zr0.025Ti0.975O3ferroelectric ceramics have been investigated. The compound was synthesized using solid state reaction technique. The effect of yttrium substitution on structural, dielectric and ferroelectric properties was studied using X-ray diffractometer, scanning electron microscopy (SEM), LCR meter and PeE loops. Phase analysis shows the formation of secondary phase YTi2O6 for Y ≥ 2.5 mol% substitution. The microstructural investigation shows that Y substitution significantly reduces the grain size. An increase in Y content up to 2.5 mol% increases the Curie temperature (Tc) initially but decreases subsequently. The maximum dielectric constant at Tc has been observed for 2 mol% Y substitution and with further increase in Y content the dielectric constant decreases considerably. The solubility limit is found to be 2.5 mol% of Y and after that some of the yttrium atoms enter B-sites and leading to the formation of the secondary phase. The PeE loop studies show that there is an increase in the coercive field with increasing Y content.
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Pankaj Kumar Jha,Saroj Sapkota,Neena Amatya Gorkhali,Bhoj Raj Pokharel,Ajeet Kumar Jha,Shishir Bhandari,Bhola Shankar Shrestha 한국동물생명공학회(구 한국동물번식학회) 2019 Journal of Animal Reproduction and Biotechnology Vol.34 No.4
The study was conducted to evaluate the seminal attributes and cryo-banking of Achhami (Bos indicus) bull semen. Of two Achhami bulls, 8 ejaculates from each bull were evaluated for seminal attributes. For semen freezing and cryo-banking, 4 ejaculates (having ≥2 mL semen volume, ≥75% of sperm motility and ≥1,000 × 106 cells/mL of sperm concentration) from each bull were used. Semen samples were diluted in egg-yolk-tris-citrate extender using a two-step dilution protocol, and were frozen in liquid nitrogen (LN2) vapour in a styrofoam box. The mean semen volume, colour, sperm mass activity, motility, viability, concentration, abnormal acrosome, midpiece and tail and, abnormal head of two Achhami bulls were 4.4 ± 0.5 mL vs. 2.5 ± 0.2 mL, 2.5 ± 0.1 vs. 2.4 ± 0.1, 3.5 ± 0.1 vs. 3.5 ± 0.1, 77.0 ± 1.1% vs. 78.3 ± 1.3%, 94.4 ± 0.5% vs. 91.0 ± 0.6%, 1137.7 ± 73.7 × 106 cells/mL vs. 1060.0 ± 44.3 × 106 cells/mL, 10.2 ± 0.5% vs. 10.3 ± 0.5% and 6.7 ± 0.5% vs. 8.2 ± 0.3%, respectively. The post-thawed sperm motility and viability were 53.0 ± 2.0% vs. 50.0 ± 0.0% and 80.2 ± 0.4% vs. 73.2 ± 0.7%, while evaluating by computer-assisted sperm analysis (CASA) system, the percentage of the progressive motility, fast motility, slow motility, local motility and immotile sperm were 75%, 68%, 7.4%, 16.6% and 8.6%, respectively. A total number of 620 doses semen straw were cryo-banked. Due to the acceptable post-thawed sperm motility and viability recorded, cryopreservation of Achhami semen is hereby recommended so as to preserve the Achhami breed. For further validation, the fertility will be observed from the produced frozen semen.
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Jha, Ajay,Lee, Yeol-Lim,Jang, Won-Jun,Shim, Jae-Oh,Jeon, Kyung-Won,Na, Hyun-Suk,Kim, Hak-Min,Roh, Hyun-Seog,Jeong, Dae-Woon,Jeon, Sang Goo,Na, Jeong-Geol,Yoon, Wang Lai Elsevier 2017 Molecular catalysis Vol.433 No.-
<P>The present study focused on the effect of reducibility of support oxide (CeO2, ZrO2, TiO2, and Al2O3) over the activity of cobalt-based catalysts in high temperature water-gas shift (HT-WGS) reaction. The H-2 temperature programmed reduction (TPR) and CO chemisorption characterization results showed that dispersion of cobalt over the support was increased with the increase of the reducibility of the support oxide. The supported catalysts were characterized by X-ray diffraction (XRD) and N-2 adsorption-desorption. The results indicated that the Co/CeO2 catalyst possesses the highest surface area and metal dispersion in the series; Co/CeO2 > Co/ZrO2 > Co/Al2O3 > Co/TiO2. The activity results showed that Co/CeO2 was the highly active among the tested catalysts in the temperature range of 350-550 degrees C. Moreover, the time-on-stream study revealed that the Co/CeO2 catalyst was relatively more stable than cobalt supported on ZrO2 and Al2O3 oxides. The excellent activity and stability of the Co/CeO2 catalyst were attributed to its high metal dispersion, which is found strongly dependent on the reducible nature of the support. (C) 2017 Elsevier B.V. All rights reserved.</P>
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Jha, A.,Jeong, D.W.,Jang, W.J.,Lee, Y.L.,Roh, H.S. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.30
The effect of the preparation method on the activity and stability of Ni-Cu-CeO<SUB>2</SUB> oxide catalysts have been investigated in the high temperature water-gas shift (HT-WGS) reaction. The highest CO conversion (85%) and selectivity was achieved by the catalyst prepared by evaporation induced self-assembly method (Ni-Cu-CeO<SUB>2</SUB>-SG) at a very high GHSV of 84,000 h<SUP>-1</SUP>. The improved performance of the catalyst was attributed to the mesoporous nature of the Ni-Cu-CeO<SUB>2</SUB>-SG which can provide higher surface area and facilitate the easier diffusion of gas through its mesoporous channels.
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Jha, Debesh,Kim, Ji-In,Choi, Moo-Rak,Kwon, Goo-Rak Hindawi 2017 Computational intelligence and neuroscience Vol.2017 No.-
<P>Accurate diagnosis of pathological brain images is important for patient care, particularly in the early phase of the disease. Although numerous studies have used machine-learning techniques for the computer-aided diagnosis (CAD) of pathological brain, previous methods encountered challenges in terms of the diagnostic efficiency owing to deficiencies in the choice of proper filtering techniques, neuroimaging biomarkers, and limited learning models. Magnetic resonance imaging (MRI) is capable of providing enhanced information regarding the soft tissues, and therefore MR images are included in the proposed approach. In this study, we propose a new model that includes Wiener filtering for noise reduction, 2D-discrete wavelet transform (2D-DWT) for feature extraction, probabilistic principal component analysis (PPCA) for dimensionality reduction, and a random subspace ensemble (RSE) classifier along with the <I>K</I>-nearest neighbors (KNN) algorithm as a base classifier to classify brain images as pathological or normal ones. The proposed methods provide a significant improvement in classification results when compared to other studies. Based on 5 × 5 cross-validation (CV), the proposed method outperforms 21 state-of-the-art algorithms in terms of classification accuracy, sensitivity, and specificity for all four datasets used in the study.</P>
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