Multiband split-ring resonator based planar inverted-F antenna for 5G applications

5G, the fifth generation of wireless communications, is focusing on multiple frequency bands, such as 6GHz, 10GHz, 15GHz, 28GHz, and 38GHz, to achieve high data rates up to 10 Gbps or more.The industry demands multiband antennas to cover these distant frequency bands, which is a task much more challenging. In this paper, we have designed a novel multiband split-ring resonator (SRR) based planar inverted-F antenna (PIFA) for 5G applications. It is composed of a PIFA, an inverted-L parasitic element, a rectangular shaped parasitic element, and a split-ring resonator (SRR) etched on the top plate of the PIFA.The basic PIFA structure resonates at 6GHz. An addition of a rectangular shaped parasitic element produces a resonance at 15GHz. The introduction of a split-ring resonator produces a band notch at 8GHz, and a resonance at 10GHz, while the insertion of an inverted-L shaped parasitic element further enhances the impedance bandwidth in the 10GHz band. The frequency bands covered, each with more than 1GHz impedance bandwidth, are 6GHz (5–7GHz), 10GHz (9–10.8GHz), and 15GHz (14-15GHz), expected for inclusion in next-generation wireless communications, that is, 5G. The design is simulated using Ansys Electromagnetic Suite 17 simulation software package.The simulated and the measured results are compared and analyzed which are generally in good agreement

A Novel Approach to Data Extraction on Hyperlinked Webpages

The World Wide Web has an enormous amount of useful data presented as HTML tables. These tables are often linked to other web pages, providing further detailed information to certain attribute values. Extracting schema of such relational tables is a challenge due to the non-existence of a standard format and a lack of published algorithms. We downloaded 15,000 web pages using our in-house developed web-crawler, from various web sites. Tables from the HTML code were extracted and table rows were labeled with appropriate class labels. Conditional random fields (CRF) were used for the classification of table rows, and a nondeterministic finite automaton (NFA) algorithm was designed to identify simple, complex, hyperlinked, or non-linked tables. A simple schema for non-linked tables was extracted and for the linked-tables, relational schema in the form of primary and foreign-keys (PK and FK) were developed. Child tables were concatenated with the parent table’s attribute value (PK), serving as foreign keys (FKs). Resultantly, these tables could assist with performing better and stronger queries using the join operation. A manual checking of the linked web table results revealed a 99% precision and 68% recall values. Our 15,000-strong downloadable corpus and a novel algorithm will provide the basis for further research in this field.publishedVersio

Effect of early release of tourniquet in total knee arthroplasty

Objective: To evaluate whether tourniquet release intraoperatively is better than postoperative release in reducing overall blood loss, duration of surgery, duration of tourniquet, length of hospital stay, wound related complications and transfusion requirement. Study Design: Comparative study. Place and Duration of Study: Department of Surgery, The Aga Khan University Hospital, Karachi, from January 2004 to June 2007. Methodology: One hundred and thirty patient files were reviewed retrospectively. Patients were divided into two groups. Group-A consisted of 65 patients with early deflation of tourniquet and group-B comprised of 65 patients with the release of tourniquet after applying compressive dressing. Total blood loss (determined by Gross method) and other study variables were noted as per objective and computed.Results: There were 22 males and 108 females with comparable BMI. All had undergone posterior stabilized cemented total knee replacement. Calculated blood loss was 1.208 L and 1.108 L in group-A and B respectively (p = 0.27). Significant increase in duration of surgery was noted in group-A patients. Four patients in group-B showed complication related to wound with 3 being minor and 1 requiring additional operation room visit. Mean length of hospital stay was 9 days. Transfusion frequency was higher in group-B despite comparable postoperative haemoglobin values. Conclusion: Intraoperative tourniquet release does not reduce overall blood loss with no effect in conserving blood after total knee replacement, however, this group had relatively shorter hospital stay

Transfusion practice in orthopedic patients: do we really need it?

Abstract OBJECTIVE: To determine the proportion of inappropriate transfusions in patients undergoing orthopaedic surgery at a tertiary care university hospital, and factors associated with inappropriate transfusions. METHODS: The prospective study was conducted at Aga Khan University Hospital, Karachi, from December 2008 to September 2009, and comprised patients admitted to the Orthopaedic Department and received transfusion of at least one packed cell. Patients were divided into four groups: A, those with haemoglobin \u3c 7, B, haemoglobin 7.1-10 without ischemic heart disease, C, haemoglobin 7.1-10 with ischemic heart disease, and D, haemoglobin \u3e10. Variables recorded were, pre-transfusion haemoglobin level, co-morbids, symptoms of hypovolemia, pre-transfusion volume replacement with fluids, transfusion reactions, and haemoglobin after 48 hours. Indications of transfusion were assessed in accordance with available data. RESULTS: Of the 126 patients, 65(52%) were males and 61(48%) were females. There were 18(14%) patients in group A, 88(70%) in group B, 12(10%) in group C, and 8(6%) in group D. Overall, Overall, 44(35%) were transfused appropriately according to the criteria, and 82(65%) were inappropriate. CONCLUSIONS: The number of inappropriate transfusion was quiet high and demands revision of institutional policy of packed cell transfusion in accordance with available guidelines

The investigation of the relationship between citizen participation and organizational citizenship behavior in the Gachsaran’s municipality

This study has tried to examine the relationship between two variables as citizen participation and organizational citizenship behavior in the Gachsaran’s municipality. Participation is of urban life’s requirements and it is realized when the burgher has converted from individual life and with a sense of collective responsibility to citizens. In order to meet the needs of urban development and advertence to the posterity’s share, therefore, we should plan the administration of the urban life’s affair on the basis of a systematic pattern of planning with the meaningful, informed and voluntary participation of citizens

Developmental dysplasia of the hip

Developmental dysplasia of the hip (DDH) is a spectrum of anatomical abnormalities of the hip joint in which the femoral head has an abnormal relationship with the acetabulum. Most studies report an incidence of 1 to 34 cases per 1,000 live births and differences could be due to different diagnostic methods and timing of evaluation. Risk factors include first born status, female sex, positive family history, breech presentation and oligohydramnios. Clinical presentations of DDH depend on the age of the child. Newborns present with hip instability, infants have limited hip abduction on examination, and older children and adolescents present with limping, joint pain, and/or osteoarthritis. Repeated, careful examination of all infants from birth and throughout the first year of life until the child begins walking is important to prevent late cases. Provocative testing includes the Barlow and Ortolani maneuvers. Other signs, such as shorting of the femur with hips and knees flexed (Galeazzi sign), asymmetry of the thigh or gluteal folds, and discrepancy of leg lengths are potential clues. Treatment depends on age at presentation and outcomes are much better when the child is treated early, particularly during the first six months of life

Earthquake relief experience of Aga Khan University trauma team

The volatile geo-political situation of the country after the events of September 11, compelled the department of Surgery at Aga Khan University (AKU) to initiate the formation of a comprehensive disaster plan and trauma team. Since its inception the trauma team has stood the test of time during multiple disaster situations in Karachi. This includes the bus bombing of the French engineers, Hyderi mosque bomb blast and various other bomb blasts inside the city of Karachi. All these disasters were successfully managed within the premises of AKU. This earthquake relief activity was the first of its kind when the AKU trauma team ventured out and performed brilliantly, yet again, in a totally foreign environment

PSYCHOSOCIAL CORRELATES OF POST-TRAUMATIC STRESS DISORDER IN PATIENTS WITH FIRE BURNS

OBJECTIVE: to elucidate the psychosocial correlates of post-traumatic stress disorder (PTSD) in the burn victims of Pakistan. METHODOLOGY: A total of 200 burn victims were included in the sample. The standardized measures were used to assess the symptom levels of PTSD. The detailed demographic profile of the patients was also received for gleaning the demographics’ association with PTSD symptoms. The screening of PTSD symptoms for further clinical management had also been catered through this data collection strategy. For analysis SPSS Version 22.0 was employed. RESULT: Mean age of the respondents was 30.56+10.3 years. Most of the respondents were males (n=111, 55.5%), panjabi speaking (n=120; 60%), followers of Islam (n=146; 73%), lower socioeconomic class (n=93; 45.5%), illiterate (n=114; 57%), Unemployed/Housewife (n=155; 77.5%) and were married (n=143; 71.5%). Most of the respondents had high PTSD levels (n=169; 84.5%). Panjabi natives (n=105/120; 87.5%), married persons (n=120/143), urban background (n= 110/118; 93.2%), persons currently living with children (n=102/123; 82.9%), Unemployed/Housewife (n=140/155; 90.3%), illiterate (n=109/114; 95.6%), respondents who experienced domestic violence (n=150/151; 99.3%) and those experienced burn injuries less than one-year duration (n=140/151; 92.7%) had higher PTSD levels than their counterparts. Fifty-one (25.5 %) respondents had suicidal ideation. CONCLUSION: Being male, married, illiterate, urban background, having history of domestic abuse, unemployed/housewives, having lower education level and experienced burn injuries less than one-year duration are significant psychosocial correlates of PTSD in patients with fire burns

Teacher Training in Pakistan: Overview of Challenges and their Suggested Solutions

Education is a key component of progress in the present-day world. But this progress cannot be made without efforts of teachers. Therefore, teacher education, in particular teacher training becomes extremely important. In this regard, several trainings programs are initiated and executed across Pakistan but the desired outcomes have not been achieved so far. Hence, this study was conducted to explore the challenges in teacher training in Pakistan and the ways through which these issues can be resolved. The sources for the data of the study were the published studies in the field in the context of Pakistan, national education policy, and other relevant literature. Based on secondary data, the study concludes that the issues with teacher training in Pakistan are administrative as well as faculty related. The findings reveal that the challenges related to policy and planning, poor induction of teachers, lack of resources in teacher training institutions, demotivation among teachers, and unequal distribution of skilled and productive teachers, dual training system and infrequent trainings. These issues can be fixed by fostering encouraging environment, ensuring accountability and merit, providing necessary resources, systematizing professional training programs and their continuation. The findings of this study will, therefore, positively guide policymakers to develop the right and effective policy to improve the standard of teacher education in the country