Shadow Detection in Aerial Images using Machine Learning

Shadows are present in a wide range of aerial images from forested scenes to urban environments. The presence of shadows degrades the performance of computer vision algorithms in a diverse set of applications such as image registration, object segmentation, object detection and recognition. Therefore, detection and mitigation of shadows is of paramount importance and can significantly improve the performance of computer vision algorithms in the aforementioned applications. There are several existing approaches to shadow detection in aerial images including chromaticity methods, texture-based methods, geometric, physics-based methods, and approaches using neural networks in machine learning. In this thesis, we developed seven new approaches to shadow detection in aerial imagery. This includes two new chromaticity based methods (i.e., Shadow Detection using Blue Illumination (SDBI) and Edge-based Shadow Detection using Blue Illumination (Edge-SDBI) and five machine learning methods consisting of two neural networks (SDNN and DIV-NN), and three convolutional neural networks (VSKCNN, SDCNN-ver1 and SDCNN ver-2). These algorithms were applied to five different aerial imagery data sets. Results were assessed using both qualitative (visual shadow masks) and quantitative techniques. Conclusions touch upon the various trades between these approaches, including speed, training, accuracy, completeness, correctness and quality

UNOPERATED TETRALOGY OF FALLOT: A CLINICOPATHOLOGIC STUDY OF A 12 MONTHS CHILD AT GOVERNMENT GENERAL HOSPITAL, KADAPA

Tetralogy of fallot is a congenital cardiac malformation that consists of an interventricular miscommunication. This combination of lesions occurs in three of every 10,000 live births and accounts for 7–10% of all congenital cardiac malformations. It is a condition caused by a combination of defects in all the four heart chambers that are present at birth. These defects affect the structure of heart, cause oxygen poor blood to flow out of the heart and to the rest of the body. Infants and children with TOF usually have blue tinged skin. The prevalence rate of TOF is 3.5% affecting males and females equally. Pneumonia is an infection of lungs that inflames air sacs in one or both lungs. The air sacs may fill with fluid or pus causing cough with phlegm, fever, and chills. It is most common in infants and young children and people with weakened immune system. A 12 months’ female child with this congenital heart defect and pneumonia was discussed in this report. However, most of the children with TOF need surgery, but timings may vary depending on the condition and severity. This is important to note that surgery for TOF is palliative but not curative. This report concludes that there is a need to increase awareness of TOF so as to encourage early diagnosis and therefore promotes better outcomes

Effect of series resistance and interface state density on electrical characteristics of Au/SiO2/n-GaN Schottky diodes

metal-insulator-semiconductor (MIS) Schottky diodes and compared with (Au/n-GaN)metal-semiconductor (MS) Schottky diode. The effect of SiO2 on the surface preparation of n-GaN (MIS) Schottky diode is analyzed. The extracted Schottky barrier height and ideality factor of the MS Schottky diode is found to be 0.79 eV and 1.45 respectively. It is observed that the Schottky barrier height increases to 0.86 eV and ideality factor decreases to 1.3 for MIS diode. The interface state density as determined by Terman’s method is found to be 3.79 × 1012 and 3.41 × 1010 cm - 2 eV - 1 for the MS and MIS Schottky diodes, respectively. In addition, the values of series resistance (Rs) are determined using Cheung’s method. The I - V characteristics confirmed that the distribution of Nss, Rs and interfacial layer are important parameters that influence the electrical characteristics of MIS Schottky diodes. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2222

INVESTIGATION OF CHEMICAL AND PHARMACOLOGICAL PROPERTIES OF ESSENTIAL OILS FROM TWO SYZYGIUM SPECIES OF ANDHRA PRADESH, INDIA

Objective: The present investigation is carried out to study the chemical composition, antimicrobial and antioxidant activity of essential oils of two Syzygium species i.e. Syzygium alternifolium (SA) and S. samarangense (SS) leaves.Methods: The essential oils from S. alternifolium (SA) and S. samarangense (SS) leaves were obtained by hydro-distillation and analyzed by GC and GC-MS. The oils were subjected to antimicrobial and antioxidant activities by using in vitro methods.Results: Essential oils (EOs) obtained by hydro distillation were analyzed through GC and GC-MS and resulted 25 compounds from each sample. SA leaf oil was dominated by monoterpene hydrocarbons (53.53%) of which, β-mercene (24.04%), β-pinene (9.23%), β-trans-ocimene (9.2%), cyclofenchene (7.21%) and β-cis-ocimene (2.1%). Whereas SS leaf oil was dominated by sesquiterpene components i.e. viridiflorol (15.05%) α-cubebene (7.71%) and monoterpenes, i.e. β-pinene (11.64%), α-pinene (9.61%) and α-terpineol (5.19%). Both essential oils exhibited strong and broad spectrum of antimicrobial activity. The antimicrobial results showed that SA-leaf oil strongly inhibited Candida rugosa (CR), Bacillus subtilis (BS) and Staphyloccus aureus (ST), whereas SS-leaf oil strongly inhibited CR and Escherichia coli (EC). Among the test organisms, CR was strongly inhibited by both oils by expression of the lowest minimum inhibitory concentrations (MIC). Further, both the test EOs exhibited concentration dependent DPPH scavenging activity indicating the significant antioxidant property.Conclusion: Syzygium alternifolium and S. samarangense leaf essential oils are the good source of natural antimicrobial and antioxidant compounds, which can be used as natural therapeutic agents against human pathogenic organisms.Â

PATTERNS OF ACUTE POISONING AMONG PATIENTS TREATED IN THE EMERGENCY WARDS OF A TERTIARY CARE HOSPITAL: A CROSS-SECTIONAL STUDY

Objective: Poisoning is a growing health-care burden in developing countries like India. Predicting the nature of the intention behind poisoning and type of poisoning agent involved will help in facilitating appropriate treatment measures, hence, improving the patient's quality of life.Methods: The prospective, observational study was conducted in a tertiary care multispecialty hospital for 6 months from November 2016 to April 2017 and involved a total of 133 patients. Treatment and outcomes of the patients were collected, documented in a data collection form. Chi-square test and logistic regression analysis were applied.Results: The mean age of the study participants was 27.76±15.5 with predominance seen in age groups of <30 years (59.3%), females (52.6%), and married (49.6%). Intentional poisoning (69.1%) through oral ingestion (81.2%) of medications (51.6%) in solid forms (60.2%) was predominant. Patients presenting with systemic manifestations (70.4%) arrived in a time duration >1 h (66.2%), received first aid (62.4%), and supportive care (52.7%). Higher ingestion of physical forms was significantly observed in both single (OR: 4.5) and married (OR: 3). The outcomes were correlated with poison severity score and patients with mild symptoms recovered (60.9%).Conclusion: The use of medicines for intentional poisoning continues to be rampant in younger age groups and married individuals. Educational programs with more accentuation on the data regarding toxic substances along with preventive measures are to be implemented to make mindfulness among the overall population

SOCIODEMOGRAPHIC PROFILE OF PATIENTS WITH ACUTE POISONING IN THE EMERGENCY WARDS OF A TERTIARY CARE HOSPITAL

Objective: To assess the socio-demographic profile and outcomes in the patients with poisoning admitted to the emergency wards of a tertiary care hospital.Methods: The prospective observational study was conducted for a period of six months in the emergency wards of a tertiary care hospital. The demographic data, hospital admission variables and outcomes were collected from various sources and documented. Cluster analysis was used to find the interaction between the socio-demographic and hospital admission variables in association with outcomes of poisoning.Results: A total of 133 patients were admitted with acute poisoning. The mean age was 27.76±15.5%. Females (51.1%) were dominant over males (48.8%). Incidents of poisoning were predominant in married (49.6%), literates (41.35%), abiding in urban region (86.4%) and belonging to upper lower class (37.6%). The poisonings were intentional (69.17%) occurring through oral route (81.2%) at home (82%). Reason for poisoning was the most significant (1.00*) predictor followed by route of poisoning. Patients with mild symptoms were 85.71% 10.5% moderate and severe symptoms 3.75%. Majority of the victims recovered (82.71%) whilst 4.51% died.Conclusion: Poisoning patterns vary with socio-demographic and socio-economic status, which is a prevalent social and economic issue in developing countries. Depression acts as a slow poison and is common among younger age groups leading to increased cases of intentional poisoning, thereby indicating a necessity for appropriate psychiatric counselling, medical and peer management strategies to identify the individuals in need that can reduce the risk of next attempt

Symptomatic “H” Type Duplex Gallbladder

A case of ductular type duplex gallbladder is presented that was diagnosed by magnetic resonance cholangiopancreatography and managed by laparoscopy