http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
An Integrated Approach to the Improvement of Stability Lobes
Sekar Mohan,Srinivas Jonnalagadda,Namcheol Kang,Seung-Han Yang 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.4
Redundant spurious loops and overlapping segments in stability lobe diagrams cannot be removed easily by regular methods. A programmatic approach is presented to detect multiple spurious loops occurring within the lobes. They are identified by reorganizing the numerical lobe data into speed-depth corners for subsequent removal. The same principle is then extended to remove overlapping segments of adjacent lobes to obtain a final continuous stability map. Unlike existing methods, the proposed methodology requires no interface with additional editing software, and can also yield stability lobe diagrams more quickly. The methodology is presented with lobe diagrams constructed using milling and turning models.
Multi-Parameter Approach for Evaluation of Genomic Instability in the Polycystic Ovary Syndrome
Sekar, Nishu,Nair, Manju,Francis, Glory,Kongath, Parvathy Raj,Babu, Sandhya,Raja, Sudhakaran,Gopalakrishnan, Abilash Valsala Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: The polycystic ovary syndrome (PCOS), characterized by hyperandrogenism and chronic anovulation, is a common endocrine disorder in women. PCOS, which is associated with polycystic ovaries, hirsutism, obesity and insulin resistance, is a leading cause of female infertility. In this condition there is an imbalance in female sex hormones. All the sequelae symptoms of PCOS gradually lead to cancer in the course of time. It is heterogeneous disorder of unknown etiology so it is essential to find the exact cause. Materials and Methods: In this study both invasive and non-invasive techniques were employed to establish the etiology. Diagnosis was based on Rotterdam criteria (hyperandrogenism, ovulatory dysfunction, PCOM) and multiparameters using buccal samples and dermatoglypic analysis and cytogenetic study for 10 cases and four age and sex matched controls. Results: In clinical analysis we have observed the mean value of total testosterone level was 23.6nmol/L, total hirsutism score was from 12-24, facial acne was found in in 70% patients with 7-12 subcapsular follicular cysts, each measuring 2-8 mm in diameter. In dermatoglypic analysis we observed increases in mean value ($45.9^{\circ}$) of ATD angle when compared with control group and also found increased frequency (38%) of Ulnar loops on both fingers (UU), (18%) whorls on the right finger and Ulnar loop on left finger (WU) and (16%) arches on right and left fingers (AA) were observed in PCOS patients when compared with control subjects. Features which could be applied as markers for PCOS patients are the presence of Ulnar loops in middle and little fingers of right and left hand. The buccal micronucleus cytome assay in exfoliated buccal cells, we found decrease in frequency of micronuclei and significant increases in frequency of karyolysed nuclei in polycystic ovarian syndrome patients. Chromosome aberration analysis revealed a significant increase in frequency of chromosome aberrations (CAs) in PCOS patients when compared with controls. Conclusions: From this present work it can be concluded that non-invasive technique like dermatoglypics analysis and buccal micronucleus cytome assays with exfoliated buccal cell can also be effective biomarkers for PCOS, along with increased CAs in lymphocytes as a sign of genetic instability. There is a hypothesis that micronuclei and chromosomal aberrations could have a predictive value for cancer. From this present work it can be concluded to some extent that non-invasive technique like dermatoglypics and buccal cell analysis can also be effective for diagnosis.
PANI-Based Wearable Electrochemical Sensor for real time Sweat pH Monitoring
Sekar Madhu(세카르 마두),Md. Sajjad Alam(Md. 사자드 알람),Jungil Choi(최정일) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Sweat pH is an important health indicator related to metabolism and homeostasis level over hydrogen ion concentration in biological bio-fluid. Therefore, increasing research efforts have been motivated to develop wearable pH sensors towards continuous non-invasive monitoring of sweat pH values. A textile based skin-mounted microfluidic potentiometric device for electrochemical monitoring of pH in sweat is presented. The fabricated Polyaniline (PANI) incorporated carbon cloth (CC) pH sensor was tested in the range from 4 to 7, showing good behavior, with a sensitivity of 64.4 mV/pH, very close to a Nernstian response, better repeatability and good ion selectivity. Finally, a real sweat sample was collected, and the sweat pH was quantified with both the proposed sensor and a commercial pH meter, showing an excellent concordance. This soft skin-worn platform integrates potentiometric measurement, microfluidic technologies with flexible electronics for real-time wireless data transmission to mobile devices. The proposed device paves the way to build a novel practical fitness and health monitoring systems for improving practical fitness of human in real-time.
Sekar Vadhana,Jothi Latha,Natanasabapathy Velmurugan 대한치과보존학회 2015 Restorative Dentistry & Endodontics Vol.40 No.2
Objectives: This study evaluated the penetration depth of 2% chlorhexidine digluconate (CHX) into root dentinal tubules and the influence of passive ultrasonic irrigation (PUI) using a confocal laser scanning microscope (CLSM). Materials and Methods: Twenty freshly extracted anterior teeth were decoronated and instrumented using Mtwo rotary files up to size 40, 4% taper. The samples were randomly divided into two groups (n = 10), that is, conventional syringe irrigation (CSI) and PUI. CHX was mixed with Rhodamine B dye and was used as the final irrigant. The teeth were sectioned at coronal, middle and apical levels and viewed under CLSM to record the penetration depth of CHX. The data were statistically analyzed using Kruskal-Wallis and Mann-Whitney U tests. Results: The mean penetration depths of 2% CHX in coronal, middle and apical thirds were 138 μm, 80 μm and 44 μm in CSI group, respectively, whereas the mean penetration depths were 209 μm, 138 μm and 72 μm respectively in PUI group. Statistically significant difference was present between CSI group and PUI group at all three levels (p < 0.01 for coronal third and p < 0.001 for middle and apical thirds). On intragroup analysis, both groups showed statistically significant difference among three levels (p < 0.001). Conclusions: Penetration depth of 2% CHX into root dentinal tubules is deeper in coronal third when compared to middle and apical third. PUI aided in deeper penetration of 2% CHX into dentinal tubules when compared to conventional syringe irrigation at all three levels.
Parametric NURBS Curve Interpolators
Sekar Mohan,Sung-Hwan Kweon,Dong-Mok Lee,Seung-Han Yang 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.2
Free-form shapes which were once considered as an aesthetic feature are now an important functional requirement. CNC industries are looking for a compact solution for reproducing free-form shapes as conventional interpolation models are inadequate. The parametric curve interpolator developed in the last decade has clearly emerged as favorite among its contemporaries in recent years. At present intense research has been done on parametric curve interpolators and interesting developments are reported. Out of the various parametric representations for curves and surfaces, NURBS has been standardized and widely used in free-form shape design. This paper presents a review of various methods of parametric interpolation for NURBS and discusses the salient features, problems and solutions. Recent approaches on variable feedrate interpolation, parameter compensation are also reviewed and research trends are addressed finally.