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Nam, Sanghun,Patil, Ashok Kumar,Patil, Shashidhar,Chintalapalli, Harinadha Reddy,Park, Kyoungju,Chai, Youngho SAGE Publications 2013 Proceedings of the Institution of Mechanical Engin Vol.227 No.12
<P>A spatial modelling system with a new interface which is optimized for automotive design is proposed in the conceptual modelling phase. In the initial sketch stage to set the volume and the ratio of the car, the automotive styling is created using a two-dimensional plane sketch with an accurate input and a designer-friendly interface. The character lines, which have important implications in the design of the car, are drawn with a curve-based oversketch. The shape of the car is modified using area-based modification. A completed two-dimensional model consists of converting the character lines to a three-dimensional car model. In the three-dimensional spatial oversketch stage, the edge and mesh on the surface are deformed by viewing the three-dimensional shape of the vehicle with various views using a spatial input device and stereoscopic display. Edge-based deformation modifies single or multiple edges while maintaining continuity between the surfaces. A sculpting technique is applied to execute special shapes such as the accent lines and the strake lines. A sketch system which can be used by designers to perform three-dimensional spatial modelling is proposed.</P>
Interactive LEGO modeling using dual wands with relative attitude mapping
Harinadha Reddy C,Shashidhar Patil,Ashok Kumar Patil,Youngho Chai 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
본 논문에서는 상대 자세로 위치를 매핑할 수 있는 두 개의 완드를 이용한 인터렉티브 레고 모델링을 제안하였다. 각 완드는 3차원 공간상의 자세를 추적할 수 있는 관성측정장치를 포함하고 있다. 관성측정장치는 3축의 관성센서(자이로스코프, 가속도계와 디지털 나침판)로 구성되어 있으며, 보드에 프로그램 되어 포함된 Quaternion Kalman Filter 알고리즘을 이용하여 관성센서로부터의 신호를 자세로 융합하였다. 듀얼 완드로 인터렉티브 레고 모델링을 실현시키기 위하여 완드의 3차원 공간상의 위치를 두 완드의 상대 자세를 이용하여 추적할 수 있게 하였다. 사용자는 듀얼 완드를 통하여 레고 모델링 프로그램과 용이하게 상호작용하면서 레고 모델링을 실현할 수 있게 된다. We present interactive LEGO modeling using dual wands with relative attitude mapping. Wands incorporate Inertial Measurement Units (IMU) for computing attitude in 3Dimensional space. IMU has 3-axis inertial sensors (gyroscope, accelerometer and digital compass) and onboard Quaternion Kalman Filter (KF) fuses data from inertial sensors for attitude estimation. In order to build 3D LEGO models using dual wands, relative attitude mapping technique developed to navigate in 3D space. User can interact with modeling software very easily to build LEGO models.
Arvind Gopalrao Kulkarni,Vishwanath Mahabaleshwar Patil,Shashidhar Kantharajanna Bangalore,Abhishek Saraf 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.1
Study Design: Cross-sectional study. Purpose: To accurately measure the dimensions of cervical endplates based on computed tomography (CT) scans in Indian population and assess accuracy of match with currently available cervical disc prostheses. Overview of Literature: The dimensions of currently available cervical disc replacement implants are based on early published geometrical measurements of vertebrae endplates for Caucasian population. To author’s knowledge, similar study has not been published for patients from Indian subcontinent. Methods: CT scans of cervical spine of patients from Indian subcontinent were collected and reviewed. Seventy patients (54 men and 16 women; aged 18–56 years with average of 37 years) who underwent CT scans of cervical spine were included in study. 3D CT scans of sub axial cervical spine (C3 to C7) were analyzed. The anterior-posterior (AP) and central mediolateral (CML) dimensions of superior and inferior endplates from C3 to C7 were measured using digital measuring system. Results: A total of 560 endplates of 70 patients were included in the study. The AP diameter of cervical endplates ranged from 0.87 to 2.47 cm. The CML diameters ranged from 0.84 to 2.98 cm. For levels C3/C4 and C4/C5 for AP dimension Prestige-LP (90.5%) and Prodisc-C (89%) discs showed higher percentage of matching than Discover discs (58.5%). For CML diameter, Prestige-LP (69.5%), Prodisc-C (70%) and Discover (39.5%) discs showed almost similar matching with measured endplates. For levels C5/C6 and C6/C7 for AP dimension, Prestige-LP (67.25%), Prodisc-C (49.35%) and Discover (51.5%) discs showed similar matching. For CML diameter Prestige-LP (32%), Prodisc-C (27.5%) and Discover (42.2%) discs showed poor matching with measured endplates. Conclusions: This study indicates need for redesign of cervical disc prostheses to match Indian patients. The collected anthropometric dimensions from this study may be used to design and develop indigenous artificial total disc replacement prosthesis and even cervical cages in India. With the present study being a small pilot study, the authors recommend anthropometric CT measurements in larger number of Indian patients in order to validate footprint dimensions for designing better-matched prosthesis.
Varma, Chejerla Mohan Kumar,Gouda, Patil Kalmeshwer,Saikumar, Surapaneni,Shenoy, Vinay,Shashidhar, Halagappa Eshwarappa,Neelamraju, Sarla 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.3
Wild species of the genus Oryza are a good source of beneficial alleles for enhancing rice yield under normal and adverse conditions. $Bc_2F_3$ population was derived from a cross between Oryza sativa IR58025B and Oryza meridionalis Ng. (2n = 24, AA) a heat tolerant wild species to evaluate 12 yield traits under irrigated and aerobic conditions. Analysis of variance and genetic estimates indicated there is substantial genetic variation among progenies under both conditions. Grain yield had high heritability (61.9%) and genetic advance (36.4%) under irrigated conditions but moderate heritability (49.6%) and genetic advance (13.3%) under aerobic conditions indicating that selection for yield will be effective under both conditions. Panicle number, grain number, spikelet fertility, and test weight showed significant positive correlation with grain yield under both conditions. Families out-performing IR58025B for yield under both conditions were obtained providing evidence that phenotypically inferior O. meridionalis contributed to yield increase. This species can be a novel source of natural genetic variation for the improvement of rice under irrigated as well as under aerobic condition.