bluuebunny/crossref_metadata_2025 huggingface dataset:
Promoting Virtual Collaborative Learning with the Use of Mobile Devices
Authors: Ktoridou Despo , Doukanari Elli
Published: June 2017

With the ubiquity and rapidly expanding functionality of mobile technologies, educational institutions have the potential to improve and facilitate learning. More and more educators are employing communication, collaboration and sharing tools and resources to make learning more accessible, equitable, personalized and flexible for students everywhere. This study investigates the implementation of Cloud-Based Student-Centered Learning (CBSCL) environment with the use of mobile devices in an MIS course. For the purpose of the study, the data were elicited through students' focus groups and the lecturer's notes on CBSCL as a virtual learning environment. The data were examined based on content analysis. The results indicate that CBSCL can be a challenging collaborative learning experience and a motivating approach to teaching and learning; consequently, the students become responsible for their own learning and problem solving process.
Status and Quality of E-Learning in Context of Indian Universities
Authors: Gulzar Zameer , Leema A. Anny
Published: June 2017

The educational system at all levels in India had been criticized for a long time for lagging behind modern and western education resulting in calls for improvement and transformation. The Internet applications such as E-learning are being considered by many educationists and experts as an opportunity knock at doors of Indian education system to leverage change and reform. Many Universities in India have adopted Learning Management System for E-learning purpose that has been identified as the most acceptable and a foreseen Tool present to tame various challenges in education. In this chapter, the status and quality of E-learning in Indian Universities has been discussed to fill the void in the literature on this particular topic. Therefore, the first objective of this study is to discuss the current Status and present an analytical overview of Learning Management System in Indian Universities. The second objective of this study is to evaluate Learning Management System by collecting facts about its diffusion, acceptance and its use in Indian Universities.
A Knowledge Extraction and Design Support System for Supporting Industrial and Product Design
Authors: Lee W. B. , Wang W. M. , Cheung C. F. , Wu Z. H.
Published: June 2017

Industrial and product design involves a lot of unstructured information for the generation of innovative product design ideas. However, the generation of innovative design concepts is not only time consuming but also heavily relies on the experience of product designers. Most existing systems focus mainly on the technical aspects of realizing product designs, which are inadequate to support concept generation process at the pre-design stage. In this paper, a knowledge extraction and design support system (KEDSS) is presented. The system aims at extracting key design concepts and depicting the trends of these concepts from the massive amount of unstructured design information in the open domain. A summary report, a related concept list, and concept trend graphs are produced based on the inputs of the designers' design ideas. A series of experiments have been conducted to measure the performance of the system. Moreover, the system has been successfully trial implemented as part of a public service platform for modern industrial design of injection molding machinery and equipment.
Maximizing Clicks in Email Marketing Campaigns for a Retail Company
Authors: Mackintosh Patrick , Brantley Luke , Hansen Alexander , Lindell Jacob , Pietz Jesse , Wilck Joseph H. , Leonard Taylor , Gonzalez Gerardo O
Published: June 2017

Retailers rely on strong marketing programs to make sales in a competitive environment. One of the biggest sectors of marketing is email loyalty programs. The industry uses Click Through Rate to measure the effectiveness of an email marketing campaign. Click Through Rate measures the ratio between emails sent to customers and the number of customers that open and click on the email's link. The purpose of this analysis is to define the relationship between the rate of emails sent and the amount of emails opened, opened and clicked, sent to spam, and unsubscribed. The authors' 800 million records of data consisted of all of the emails sent by a large retail company to its approximate 8 million customers and their responses to those emails for 12 weeks during the winter holiday season. The results show that the optimal send rate of 6.4 emails per week leads to an increase of emails opened and clicked while minimizing the number of users that unsubscribe, and, assuming open source revenue per click figures apply, would generate an additional $1.3 million in weekly revenue.
Interfaces, Efficiency, and Inequality
Authors: Rudenko Nikolay
Published: June 2017

In the article the author claims that the digital technologies today continue to be good topic for Actor-Network theory (ANT) research because they exemplify many famous Latourian ideas about the role of technological artifacts in moral and political life of society. By drawing upon some key insights from ANT and science and technology (STS) in general, the author tells three stories about how commercial digital application work. The stories are based upon participant observation experience of the author during his 16 months of work at the technical support unit in the UK mobile application. Firstly, the author tells about different digital interfaces in the work of the technical support that vary in how they mediate the communication with users. Second, the author shows that an inequality in the commercial app has a complex and unpredictable nature. Finally, he shows how the efficiency of the app is determined by the multiplicity of actors' ontological models that differently frame and enact their activity. After the (auto-)ethnographic experience of the author it remains open how to conjoin ANT and human-centered position of an ethnographer.
‘Stacked' Actor-Networks and Their Computer Modelling
Authors: Kopanov Peter , Tchalakov Ivan
Published: June 2017

The paper dev?lops the mathematical basis of stacked actor-network (SAN) approach in modeling a socio-economic and cultural dynamics. It attempts to avoid the idea of ‘guidance' of a given form of (social) life being modelled, which has long been dominating in traditional sociology. Using methods of discreet mathematics and stochastic finite automata approach, we provided initial mathematical formalization of agent and actor-network, the types of complexity in the actor-network and three basic types of graphs comprising SAN's minimal model, with further aim is to develop these models in the form of computer programs (software) and to test them on real sociological data.
Impact of Trust and Technology on Interprofessional Collaboration in Healthcare Settings
Authors: Palanisamy Ramaraj , Taskin Nazim , Verville Jacques
Published: June 2017

The increases in complexity of patient care, healthcare costs, and technological advancements shifted the healthcare delivery to interprofessional collaborative care. The study aims for identifying the factors influencing the quality of team collaboration. The study examines the impact of trust and technology orientation on collaboration with the mediating effects of communication, coordination and cooperation. A questionnaire survey was conducted to gather data from healthcare professionals (N=216). Statistical analysis conducted for this study include correlations, factor analysis with reliability and validity tests and Partial Least Squares (PLS) method. The results of the study validate that (i) collaboration has positive and significant relationship with coordination, and cooperation; (ii) trust has positive and significant relationship with communication, coordination, and cooperation; and (iii) technology orientation has positive and significant relationship with cooperation but not with communication and coordination. The research and managerial implications of these factors are given in discussion. As with most empirical studies, the subjectivity of the opinion of respondents present some limitations to generalization. Other limitations include the lack of availability and use of standard measures for various constructs in the research model. The results can be used by healthcare professionals and managers to advance their understanding on the impact of trust and technology on collaboration mediating communication, coordination and cooperation practices. The significant value of this study is the identification of the factors influencing the quality of team collaboration in healthcare industry.
Designing Models for Software as a Service in Cloud Computing
Authors: Shah Jaymeen , Lee Hsun-Ming , Shah Vivek
Published: June 2017

This paper details the case study of the model development at a company that offers software as a service (SaaS) to clients in the services industry. The growing market for SaaS provides the company tremendous opportunities to succeed as a startup. A new cloud-based system is aimed at facilitating the automation of cross-department collaboration by integrating company's Web applications to other service providers and Enterprise Resource Planning systems. However, as it is challenging to dynamically integrate multiple autonomous software systems, the company has identified Web services technologies as the foundation of the next generation software solutions. To create an extensible solution, Event-Driven Process Chain and Unified Modeling Language models are developed to model enterprise business processes and their departmental functions. The models are abstract views of complex enterprise systems. After the implementation of such models, the management team can further address issues related to the cost effectiveness, reliability and data security of software-supported business processes.
Retaining Knowledge in Smaller Building and Construction Firms
Authors: Durst Susanne , Bruns Guido , Edvardsson Ingi Runar
Published: June 2017

The purpose of this study is to increase our understanding of how SMEs retain critical knowledge. Against the background of the underdeveloped body of knowledge regarding knowledge retention, the authors selected an explorative (qualitative) research approach. More precisely, they conducted semi-structured interviews with organization members (i.e. executive and regular staff) of five Austrian SMEs operating in the building and construction industry. This study provides fresh insights into knowledge retention in SMEs. The findings advance the limited understanding of knowledge retention in general and regarding SMEs. They also contribute to the further development of the study of knowledge management in the building and construction sector. Based on the study's findings the authors derive suitable measures to better manage the process of knowledge retention in SMEs. These measures may be useful for SMEs operating in other industries as well.
A Knowledge Management Approach to Evaluation of Ability and Environment for Graduate Research
Authors: Sun Jing , Wu Jianguo , Tian Jing , Huynh Van-Nam , Nakamori Yoshiteru
Published: June 2017

This paper proposes a model of knowledge creation and knowledge validation for the research of postgraduate students, and then introduces an evaluation method on research ability and research environment based on this model. The paper reports the results of statistical analysis, using the data obtained by a questionnaire survey at a graduate school of computer science and technology. Among several discoveries, the great differences in the evaluation of research environment between teachers and students, and in the self-evaluation of research ability between female students and male students are noteworthy. It was confirmed that the proposed model and the evaluation method are effective for supporting research of graduate students.
Applying Machine Learning in Optical Music Recognition of Numbered Music Notation
Authors: Wu Fu-Hai Frank
Published: June 2017

Although research of optical music recognition (OMR) has existed for few decades, most of efforts were put in step of image processing to approach upmost accuracy and evaluations were not in common ground. And major music notations explored were the conventional western music notations with staff. On contrary, the authors explore the challenges of numbered music notation, which is popular in Asia and used in daily life for sight reading. The authors use different way to improve recognition accuracy by applying elementary image processing with rough tuning and supplementing with methods of machine learning. The major contributions of this work are the architecture of machine learning specified for this task, the dataset, and the evaluation metrics, which indicate the performance of OMR system, provide objective function for machine learning and highlight the challenges of the scores of music with the specified notation.
Infrastructural Drivers of Online Shopping
Authors: Akhter Syed
Published: June 2017

While online shopping expenditures have been increasing in both developed and developing economies, they still account for a small share of total retail sales. Significant differences also exist across countries in the amount of money consumers spend on a per capita basis on online purchases. The authors utilize the conceptual foundations of infrastructural framework to examine the effects of infrastructural drivers on online shopping expenditures in 43 countries. Findings show that per capita telecommunications investments and per capita gross national income are significantly associated with per capita online shopping expenditures. Privacy protection, Internet penetration, and credit card penetration were not significant.
Parallel Outlier Detection for Streamed Data Using Non-Parameterized Approach
Authors: Markad Harshad Dattatray , Sangve S. M.
Published: June 2017

Outlier detection is used in various applications like detection of fraud, network analysis, monitoring traffic over networks, manufacturing and environmental software. The data streams which are generated are continuous and changing over time. This is the reason why it becomes nearly difficult to detect the outliers in the existing data which is huge and continuous in nature. The streamed data is real time and changes over time and hence it is impractical to store data in the data space and analyze it for abnormal behavior. The limitations in data space has led to the problem of real time analysis of data and processing it in FCFS basis. The results regarding the abnormal behavior have to be done very quickly and in a limited time frame and on an infinite set of data streams coming over the networks. To address the problem of detecting outliers on a real-time basis is a challenging task and hence has to be monitored with the help of the processing power used to design the graphics of any processing unit. The algorithm used in this paper uses a kernel function to accomplish the task. It produces timely outcome on high speed multi- dimensional data. This method increases the speed of outlier detection by 20 times and the speed goes on increasing with the increase with the number of data attributes and input data rate.
Smart Refrigerator with Recipe Assistance
Authors: Gadgil Aishwarya , Jagtap Vedija , Kulkarni Pooja
Published: June 2017

Internet of Things (IoT) will lead to a technological revolution that will change the way people live and interact with their surroundings. Intelligent appliances combined with multimedia capability have been emerging in everyone's life. Smart home is one of the prominent areas of intelligent advances. Kitchen is considered as the center of our house, where the refrigerator plays an important role. Smart Refrigerator with Recipe Assistance will help in automating the refrigerator. The authors propose a system that would track the stock of ingredients in the refrigerator with the help of RFID tags and load cells. According to the availability of ingredients a list of possible recipes is predicted and suggestions will be given to the user. Whenever an item is identified by a RFID tag, estimations on the usage of ingredients are made and we can get notifications about the scarce products. The system will also help in checking the availability of ingredients based on the recipe user wishes to cook. The time required by an individual for manually checking the availability of ingredients in the refrigerator and then thinking about what to cook is greatly reduced using this system. Most of the information is automatically generated using RFID tags. Once the user logins into the application he/ she will be suggested the possible list of recipes based on the availability. Human intellectual power then can be used for new creative processes rather than using it for routine chores.
Framework for Threat Analysis and Attack Modelling of Network Security Protocols
Authors: Athavale Nachiket , Deshpande Shubham , Chaudhary Vikash , Chavan Jatin , Barde S. S.
Published: June 2017

Nowadays everything is computerized including banking and personal records. Also, to boost business profits, businessmen have changed their way of operations from physical way to electronic way, for example Flipkart. But as these developments benefit the developer they also increase the chance of exposing all of customer's personal details to malicious users. Hackers can enter into the system and can steal crucial or sensitive information about other authentic users and in case of banks leads to frauds. Security thus, becomes an important issue for all companies and banks. Intrusion detection systems help such companies by detecting in real time whether an intrusion is carried on or not. Here the authors are developing a signature based intrusion detection system which will scan incoming packets and send a warning message to system administrator. Also, the authors are implementing a framework and provide it to all the users so that developing intrusion detection based system similar to ours. The advantage of using framework is that it can be upgraded and re-defined whenever it is needed.
A Combined Dimensional Kernel Method for Graph Classification
Authors: Cao Tiejun
Published: June 2017

The data containing structural information is an important problem in the field of machine learning. Kernel methods is an effective technique for solving such problems. A combined dimension kernel method is proposed or graph classification in this paper. A two-dimensional kernel is first constructed in this method, and it incorporates one-dimensional information to characterize the molecular chemistry, and then a three-dimensional kernel is constructed based on the knowledge of molecular mechanics to characterize the physical properties of the molecule. On this basis, the kernel of different dimensions is integrated, and the quadratic programming problem with quadratic constraints is solved to obtain the optimal kernel combination. The experimental results show that the proposed method has better performance than the prior technology, and it outperforms the existing algorithm.
Extracting Criminal-Related Events from Arabic Tweets
Authors: Abdelkoui Feriel , Kholladi Mohamed-Khireddine
Published: June 2017

Recently, Twitter as one of social networks has been considered as a rich source of spatio-temporal information and significant revenue for mining data. Event detection from tweets can help to predict more serious real-world events. Such as: criminal events, natural hazards, and the spread of epidemics. Etc. This paper deals with event-based extraction for criminal incidents from Arabic tweets. It presents a framework that supports automated extraction of spatial and temporal information from tweets. The proposed approach is based on combining various indicators, including the names of places and temporal expressions that appear in the tweet message, related tweeting time, and additional locations from the user's profile. The effectiveness of the system was evaluated in term of recall, precision and f-measure.
A Hybrid Approach Based on Genetic Algorithm and Particle Swarm Optimization to Improve Neural Network Classification
Authors: Hewahi Nabil M. , Abu Hamra Enas
Published: June 2017

Artificial Neural Network (ANN) has played a significant role in many areas because of its ability to solve many complex problems that mathematical methods failed to solve. However, it has some shortcomings that lead it to stop working in some cases or decrease the result accuracy. In this research the authors propose a new approach combining particle swarm optimization algorithm (PSO) and genetic algorithm (GA), to increase the classification accuracy of ANN. The proposed approach utilizes the advantages of both PSO and GA to overcome the local minima problem of ANN, which prevents ANN from improving the classification accuracy. The algorithms start with using backpropagation algorithm, then it keeps repeating applying GA followed by PSO until the optimum classification is reached. The proposed approach is domain independent and has been evaluated by applying it using nine datasets with various domains and characteristics. A comparative study has been performed between the authors' proposed approach and other previous approaches, the results show the superiority of our approach.
The enemies within: Gog of Magog in Ezekiel 38–39
Authors: Lee Lydia
Published: June 2017

The most extensive descriptions of Gog and Magog in the Hebrew Bible appear in Ezekiel 38–39. At various stages of their political career, both Reagan and Bush have linked Gog and Magog to the bêtes noires of the USA, identifying them either as the ‘communistic and atheistic’ Russia or the ‘evil’ Iraq. Biblical scholars, however, seek to contextualise Gog of Magog in the historical literary setting of the ancient Israelites. Galambush identifies Gog in Ezekiel as a cipher for Nebuchadnezzar, the Babylonian king, who acted as Judah’s oppressor in the 6th century BCE. More recently, Klein concludes that Gog, along with his companions, is ‘eine Personifikation aller Feinde, die Israel im Buch Ezechiel gegenüberstehen’. Despite their differences in detail, these scholars, such as Reagan and Bush, work with a dualism that considers only the features of Judah’s enemies incorporated into Gog’s characteristics. Via an analysis of the semantic allusions, literary position and early receptions of Ezekiel 38–39, this article argues that Gog and his entourage primarily display literary attributes previously assigned to Judah’s political allies.
Harvesting split thickness costal cartilage graft
Authors: Gaba Sunil , Gupta Richa , Mishra Bharat , Sahni Daisy
Published: June 2017

Aim: There are few complications associated with harvesting of full thickness coastal cartilage grafts i.e., pneumothorax (0.9%), contour deformities and prolonged post-operative pain. To address these issues, authors devised special scalpel to harvest split-thickness costal cartilage grafts. Materials and Methods: Standard inframammary incision was used for harvesting rib. Incision was made directly over the desired rib. Specially designed scalpel was used to cut through the rib cartilage to the half of the thickness. The study was conducted in two parts – cadaveric and clinical. Results: There was significantly less pain and no pneumothorax in the patients in whom the split thickness graft was harvested. Wounds healed without any complication. Discussion: Thus, newly devised angulated scalpel used in the current study, showed the potential to supply the reconstructive surgeon with split thickness rib graft without risk of complications such as pneumothorax or warping contour deformities and post-operative pain.
An Anatomical study for localisation of Zygomatic branch of Facial nerve and Masseteric nerve – An aid to nerve coaptation for facial reanimation surgery: A cadaver based study in Eastern India
Authors: Poddar Ratnadeep , Bhattacharya Alipta , Sinha Iman , Ghosal Asis Kumar
Published: June 2017

Context: In cases of chronic facial palsy, where direct neurotisation is possible, ipsilateral masseteric nerve is a very suitable motor donor. We have tried to specifically locate the masseteric nerve for this purpose. Aims: Describing an approach of localisation and exposure of both the zygomatic branch of Facial nerve and the nerve to masseter, with respect to a soft tissue reference point over face. Settings and Design: Observational cross sectional study, conducted on 12 fresh cadavers. Subjects and Methods: A curved incision was given, passing about 0.5cms in front of the tragal cartilage. A reference point “R” was pointed out. The zygomatic branch of facial nerve and masseteric nerve were dissected out and their specific locations were recorded from fixed reference points with help of copper wire and slide callipers. Statistical Analysis Used: Central Tendency measurements and Unpaired “t” test. Results: Zygomatic branch of the Facial nerve was located within a small circular area of radius 1 cm, the centre of which lies at a distance of 1.1 cms (±0.4cm) in males and 0.2cm (±0.1cm) in females from the point, ‘R’, in a vertical (coronal) plane. The nerve to masseter was noted to lie within a circular area of 1 cm radius, the centre of which was at a distance of 2.5cms (±0.4cm) and 1.7cms (±0.2cm) from R, in male and female cadavers, respectively. Finally, Masseteric nerve's depth, from the masseteric surface was found to be 1cm (±0.1cm; male) and 0.8cm (±0.1cm; female). Conclusions: This novel approach can reduce the post operative cosmetic morbidity and per-operative complications of facial reanimation surgery.
Minimising the donor area morbidity of radial forearm phalloplasty using prefabricated thigh flap: A new technique
Authors: Aggarwal Aditya , Singh Hardeep , Mahendru Sanjay , Brajesh Vimalendu , Singh Sukhdeep , Ghag Nitin , Khazanchi Rakesh kumar
Published: June 2017

Phalloplasty is indicated in various conditions of penile loss or absence. There are numerous techniques for phalloplasty including the pedicle and free flaps with the ultimate goal of micturition in standing position, attaining adequate size, aesthesis and sensations for sexual intercourse. Radial forearm phalloplasty is the gold standard flap to achieve above results but gives a very bad scar on the forearm. We present a technique of using prefabricated thigh flap to reduce the morbidity of donor area. The descending branch of lateral circumflex femoral pedicle was placed in a subcutaneous plane over tissue expander. After attaining an adequate size of flap with tissue expansion, it was delayed 3 weeks before phalloplasty. Prefabricated flap was thin and of large size replicating the radial forearm flap used for phalloplasty. Whole forearm defect was covered with the thigh flap, and the thigh could be closed primarily. This new technique of using prefabricated thigh flap has significantly reduced the donor site morbidity both aesthetically and functionally without the use of skin grafting in the whole procedure.
Free anteromedial thigh perforator flap: Complementing and completing the anterolateral thigh flap
Authors: Jaiswal Dushyant , Ghalme Amol , Yadav Prabha , Shankhdhar Vinaykant , Deshpande Akshay
Published: June 2017

Objective: Theobjective of this study was to determine the indications, utility, advantages and surgical approach for the anteromedial thigh (AMT) flap. Materials and Methods: We reviewed the records of the patients in whom the AMT flap was used for head and neck reconstruction. We use an anterior approach to harvest the anterolateral thigh (ALT) flap with a non-committal straight line incision. This preserves both ALT and AMT flap territories intact, and further decision is based on the intraoperative anatomy of perforator and pedicle. The ALT flap was usually used as the first choice when available and suitable. Results: Free AMT skin flaps were harvested in 24 patients. All flaps were used for the head and neck reconstruction. Two flaps had marginal flap necrosis. One flap was lost due to venous thrombosis. Discussion: The thigh is an excellent donor site as it has large available skin territory, expendable lateral circumflex femoral artery system and low donorsite morbidity. The ALT flap is the most commonly used flap for reconstruction of soft-tissue defects. However, it is characterised by variable vascular pedicle and perforator anatomy. The AMT flap is an excellent alternative when the ALT flap is not available due to variable perforator anatomy, injury to perforator, when an intermediate thickness is needed between distal and proximal thigh or a chimeric flap is needed. Conclusion: The AMT flap offers all the advantages of the ALT flap without increasing donor-site morbidity. The anterior non-committal approach keeps both the ALT and the AMT flap options viable.
Computed tomography angiographic study of internal mammary perforators and their use as recipient vessels for free tissue transfer in breast reconstruction
Authors: Kanoi Aditya V. , Panchal Karnav B. , Sen Saugata , Biswas Gautam
Published: June 2017

Context: The internal mammary artery perforator vessels (IMPV) as a recipient in free flap breast reconstruction offer advantages over the more commonly used thoracodorsal vessels and the internal mammary vessels (IMV). Aims: This study was designed to assess the anatomical consistency of the IMPV and the suitability of these vessels for use as recipients in free flap breast reconstruction. Patients and Methods: Data from ten randomly selected female patients who did not have any chest wall or breast pathology but had undergone a computed tomography angiography (CTA) for unrelated diagnostic reasons from April 2013 to October 2013 were analysed. Retrospective data of seven patients who had undergone mastectomy for breast cancer and had been primarily reconstructed with a deep inferior epigastric artery perforator free flap transfer using the IMPV as recipient vessels were studied. Results: The CTA findings showed that the internal mammary perforator was consistently present in all cases bilaterally. In all cases, the dominant perforator arose from the upper four intercostal spaces (ICS) with the majority (55%) arising from the 2nd ICS. The mean distance of the perforators from the sternal border at the level of pectoralis muscle surface on the right side was 1.86 cm (range: 0.9–2.5 cm) with a mode value of 1.9 cm. On the left side, a mean of 1.77 cm (range: 1.5–2.1 cm) and a mode value of 1.7 cm were observed. Mean perforator artery diameters on the right and left sides were 2.2 mm and 2.4 mm, respectively. Conclusions: Though the internal mammary perforators are anatomically consistent, their use as recipients in free tissue transfer for breast reconstruction eventually rests on multiple variables.
Advocacy and mass education in plastic surgery: Efforts and outcomes
Authors: Panse Nikhil Shrikrishna
Published: June 2017

Background: Awareness of plastic surgery is lacking. Be it reconstructive surgery, or aesthetic surgery, public education and awareness regarding the spectrum is the need of the hour. Materials and Methods: We undertook a string of activities for patient awareness and education for burn prevention, occupational hand injuries prevention, skin banking awareness and various other conditions relevant to us as plastic surgeons. Use of social media helped us for increasing the reach of our projects. Observation and Results: Some of the projects we started, we are still pursuing with sincerity, and some never really picked up. A wide range and spectrum of activities were undertaken, and we would like to think that we have made some impact towards advocacy of plastic surgery; however, the measurable impact of these initiatives is questionable. Conclusion: Collective efforts for promotion of the speciality using innovative methods, use of celebrities for awareness and social media amongst other things must be undertaken to make a sustained and demonstrable impact towards advocacy of plastic surgery.
From wheelchair to walking: First case report of post-electrical burn destruction of patellar ligament with its one-stage reconstruction and restoration of function
Authors: Basu Sandip Kanti , Bain Jayanta , Majumdar Bijay Kumar , Chattopadhyay Debarati , Baitalik Debasis , Dewangan Yatindra Kumar , Bhattacharya Debtanu , Rakshit Pritha , Gupta Vivek , Kumar Ashwani , Haldar Rathindra Nath
Published: June 2017

Electrical burn injury causing bilateral patellar ligament destruction leading to complete loss of knee extension is a very rare injury. In such situation, surgical repair or reconstruction of the patellar ligament becomes necessary to restore knee functions. Here, we present such a case of an 8-year-old boy, whose both patellar ligaments were destroyed throughout its length due to high-voltage electrical injury. His left knee joint cavity was exposed and grossly infected, but the right knee joint cavity was apparently intact. The right-sided patellar ligament was reconstructed with an ipsilateral and looped semitendinosus tendon graft and covered with a medial gastrocnemius musculocutaneous flap. The patient had an uneventful recovery, and full range of motion in the right knee joint along with good bipedal locomotion was achieved successfully.
Triceps to biceps transfer for restoration of elbow flexion following upper brachial plexus injury
Authors: Rao Pothula Durga Prasada , Rao Rayidi Venkata Koteswara , Srikanth R.
Published: June 2017

Introduction: Upper brachial plexus injury in adults causes loss of elbow fl exion; when the primary nerve surgery has failed or the patient seeks treatment after 12 months of injury and pedicled muscle transfers are required. Most commonly, the latissimus dorsi or the Steindler flexorplasty is used. Material and Methods: We have transferred one of the heads of triceps muscle to restore the elbow flexion in such cases. In addition to return of elbow flexion, extension of elbow following surgery is retained. Ten patients suffering from upper brachial plexus injuries underwent transfer of one head of triceps to biceps tendon between December 2011 and August 2015. Results: The recovery of elbow flexion was Grade 5 in 1, Grade 4 in 4 and Grade 3 in 2; only three of the ten patients had no functionally useful elbow flexion. Seven of the ten patients had an adequate elbow extension following the procedure.
Pyogenic granuloma-like lesion in children: Should we wait?
Authors: Chooi Lai Kuan , Saad Arman Zaharil Mat , Durairajanayagam Shamala
Published: June 2017

Malignant melanoma is a potentially lethal cutaneous malignancy. Melanoma in paediatrics is rare as compared to adult melanoma. The clinicopathological characteristics of paediatric melanoma are different from adult melanoma, and the presence of melanoma mimics which occurs frequently in children (Spitz naevi) resulted in diagnosis uncertainty. We reported a 9-year-old girl who presented with a slow-growing, pyogenic granuloma-like lesion which was diagnosed with melanoma. It is important to have a high index of suspicion in paediatric skin lesion that would usually be deemed benign. Early tissue biopsy in a suspicious lesion prevents delayed diagnosis and treatment.
Spectral geometry of the Steklov problem (Survey article)
Authors: Girouard Alexandre , Polterovich Iosif
Published: June 2017

The Steklov problem is an eigenvalue problem with the spectral parameter in the boundary conditions, which has various applications. Its spectrum coincides with that of the Dirichlet-to-Neumann operator. Over the past years, there has been a growing interest in the Steklov problem from the viewpoint of spectral geometry. While this problem shares some common properties with its more familiar Dirichlet and Neumann cousins, its eigenvalues and eigenfunctions have a number of distinctive geometric features, which makes the subject especially appealing. In this survey we discuss some recent advances and open questions, particularly in the study of spectral asymptotics, spectral invariants, eigenvalue estimates, and nodal geometry.
Spectral homogeneity of limit-periodic Schrödinger operators
Authors: Fillman Jake , Lukic Milivoje
Published: June 2017

We prove that the spectrum of a limit-periodic Schrödinger operator is homogeneous in the sense of Carleson whenever the potential obeys the Pastur–Tkachenko condition. This implies that a dense set of limit-periodic Schrödinger operators have purely absolutely continuous spectrum supported on a homogeneous Cantor set. When combined with work of Gesztesy–Yuditskii, this also implies that the spectrum of a Pastur–Tkachenko potential has infinite gap length whenever the potential fails to be uniformly almost periodic.
Density of states for random contractions
Authors: Joye Alain
Published: June 2017

We define a linear functional, the DOS functional, on spaces of holomorphic functions on the unit disk which is associated with random ergodic contraction operators on a Hilbert space, in analogy with the density of states functional for random self-adjoint operators. The DOS functional is shown to enjoy natural integral representations on the unit circle and on the unit disk. For random contractions with suitable finite volume approximations, the DOS functional is proven to be the almost sure infinite volume limit of the trace per unit volume of functions of the finite volume restrictions. Finally, in case the normalised counting measure of the spectrum of the finite volume restrictions converges in the infinite volume limit, the DOS functional is shown to admit an integral representation on the disk in terms of the limiting measure, despite the discrepancy between the spectra of non normal operators and their finite volume restrictions. Moreover, the integral representation of the DOS functional on the unit circle is related to the Borel transform of the limiting measure.
Resonance expansions for tensor-valued waves on asymptotically Kerr–de Sitter spaces
Authors: Hintz Peter
Published: June 2017

In recent joint work with András Vasy [25], we analyze the low energy behavior of differential form-valued waves on black hole spacetimes. In order to deduce symptotics and decay from this, one in addition needs high energy estimates for the wave operator acting on sections of the form bundle. The present paper provides these on perturbations of Schwarzschild–de Sitter spaces in all spacetime dimensions

n ≥ 4

. In fact, we prove exponential decay, up to a finite-dimensional space of resonances, of waves valued in any finite rank subbundle of the tensor bundle, which in particular includes differential forms and symmetric tensors. As the main technical tool for working on vector bundles that do not have a natural positive definite inner product, we introduce
pseudodifferential
inner products, which are inner products depending on the position in phase space.
Asymptotic behavior of large eigenvalues of Jaynes–Cummings type models
Authors: Boutet de Monvel Anne , Zielinski Lech
Published: June 2017

We consider a class of unbounded self-adjoint operators including the Hamiltonian of the Jaynes–Cummings model with the rotating-wave approximation (RWA). The corresponding operators are defined by infinite Jacobi matrices with discrete spectrum. Our purpose is to give the asymptotic behavior of large eigenvalues.
Псевдоторические структуры: лагранжевы подмногообразия и лагранжевы слоения
Authors: Tyurin Nikolai Andreevich
Published: June 2017

В настоящем обзоре представлено обобщение понятия торической структуры на компактном симплектическом многообразии, получившее название псевдоторической структуры. На языке этих новых структур оказалось удобным и естественным описание многих нестандартных лагранжевых подмногообразий и циклов (а именно, экзотических торов Чеканова, циклов Миронова в некоторых частных случаях и др.), а также построение лагранжевых слоений (например, специальных в смысле Д. Ору слоений на многообразиях Фано). Мы обсуждаем уже известные свойства псевдоторических структур и конструкции, вытекающие из них, а также открытые проблемы, решение которых может оказаться важным как в симплектической геометрии, так и в математической физике.
Библиография: 28 названий.
О системах Никишина с дискретными компонентами и слабой асимптотике многочленов совместной ортогональности
Authors: Aptekarev Alexander Ivanovich , Lopez Lagomasino Guillermo , Martinez-Finkelshtein Andrei
Published: June 2017

В работе рассматриваются совместно ортогональные многочлены по отношению к системам Никишина, генерируемым двумя мерами $(\sigma_1,\sigma_2)$ с неограниченными носителями ($\operatorname{supp}(\sigma_1) \subseteq \mathbb{R}_+$, $\operatorname{supp}(\sigma_2)\subset \mathbb{R}_-$), причем $\sigma_2$ - дискретная мера. Поставлена и решена задача равновесия с матрицей взаимодействия Никишина во внешнем поле на $\mathbb{R}_+$ и ограничением на $\mathbb{R}_-$. Это решение используется для описания предельного распределения нулей многочленов совместной ортогональности.
Библиография: 56 названий.
Геометрические оценки производной Шварца
Authors: Dubinin Vladimir Nikolaevich
Published: June 2017

Статья представляет собой обзор неравенств, включающих производную Шварца и зависящих от геометрии образа области при отображении голоморфной функцией. Основное содержание статьи составляют результаты автора, полученные ранее с помощью теории емкостей конденсаторов и симметризации. Рассматриваются неравенства для однолистных и многолистных функций как во внутренних, так и в граничных точках области определения. Приводятся вспомогательные утверждения и доказательства некоторых теорем.
Библиография: 52 названия.
Топологический подход к обобщенной задаче $n$ центров
Authors: Bolotin Sergey Vladimirovich , Kozlov Valery Vasil'evich
Published: June 2017

Рассматриваются натуральные гамильтоновы системы с двумя степенями свободы и гамильтонианом $H=\|p\|^2/2+V(q)$. Конфигурационное пространство $M$ - замкнутая поверхность (для некомпактного $M$ требуются некоторые условия на бесконечности). Хорошо известно, что если потенциальная энергия $V$ имеет $n>2\chi(M)$ особых точек ньютонова типа, то система не интегрируема и имеет положительную топологическую энтропию на уровне энергии $H=h>\sup V$. В настоящей работе это утверждение обобщается на случай, когда $V$ имеет несколько особых точек $a_j$ типа $V(q)\sim {-}\operatorname{dist}(q,a_j)^{-\alpha_j}$. Положим $A_k=2-2/k$, $k\in\mathbb{N}$, и пусть $n_k$ - число особых точек таких, что $A_k\leqslant \alpha_j<A_{k+1}$. В работе доказано, что если
$$
\sum_{2\leqslant k\leqslant\infty}n_kA_k>2\chi(M),
$$
то система имеет компактное хаотическое инвариантное множество траекторий без столкновений на любом уровне энергии $H=h>\sup V$. Это утверждение чисто топологическое: оно не использует никаких аналитических свойств потенциальной энергии, кроме наличия особых точек. Доказательства основаны на обобщенной регуляризации Леви-Чивиты и элементарной топологии накрытий. В качестве примера рассмотрена плоская задача $n$ центров.
Библиография: 29 названий.
Усреднение случайных блужданий и меры на гильбертовом пространстве, инвариантные относительно сдвигов
Authors: Sakbaev Vsevolod Zhanovich
Published: June 2017

Изучаются случайные блуждания в гильбертовом пространстве $H$ и представления с их помощью решений задач Коши для дифференциальных уравнений, начальными условиями которых являются числовые функции на гильбертовом пространстве $H$. Построен конечно-аддитивный аналог меры Лебега - неотрицательная конечно-аддитивная мера $\lambda$, определенная на минимальном кольце подмножеств бесконечномерного гильбертова пространства $H$, содержащем все бесконечномерные прямоугольники, произведения длин сторон которых сходятся абсолютно, и являющаяся инвариантной относительно сдвигов и поворотов в гильбертовом пространстве $H$. Определено гильбертово пространство $\mathcal H$ классов эквивалентности комплекснозначных функций на пространстве $H$, квадратично-интегрируемых по инвариантной относительно сдвигов мере $\lambda$. С помощью усреднения операторов сдвига в пространстве $\mathcal H$ на случайные векторы пространства $H$, распределение которых задается однопараметрической полугруппой (относительно операции свертки) гауссовских мер на пространстве $H$, определяется однопараметрическая полугруппа сжимающих самосопряженных преобразований пространства $\mathcal H$, генератор которой назван оператором диффузии. Получено представление решений задачи Коши для уравнения Шредингера, гамильтонианом которого является оператор диффузии.
Электродинамика с заряженными струнами
Authors: Pestov Aivengo Borisovich
Published: June 2017

Показано, что в четырехмерном пространстве-времени комплексному скалярному полю можно поставить в соответствие одномерно-протяженный объект, называемый заряженной струной. Струна называется заряженной потому, что описывающее ее комплексное скалярное поле взаимодействует с электромагнитным полем. Заряженная струна характеризуется расширением группы симметрии зарядового пространства до группы поворотных растяжений. Предложены релятивистски-инвариантные и калибровочно-инвариантные уравнения, описывающие взаимодействие комплексного скалярного поля с электромагнитным полем, каждому решению которых соответствует заряженная струна. Достигается это введением понятия индекса заряженной струны, который, как проверено, принимает только целые значения. Установлены уравнения, из которых следует, что заряженные струны естественно вписываются в рамки электродинамики Максвелла-Дирака.
Инвариантные многообразия и пары Лакса для интегрируемых нелинейных цепочек
Authors: Habibullin Ismagil Talgatovich , Khakimova Aigul Rinatovna
Published: June 2017

Продолжены ранее начатые исследования по разработке прямого метода построения пары Лакса по заданному интегрируемому уравнению. В данном подходе не требуется никаких дополнительных предположений о свойствах уравнения. В качестве одного из уравнений пары Лакса взята линеаризация рассматриваемого нелинейного уравнения, а второе уравнение пары связано с его обобщенным инвариантным многообразием. Задача поиска второго уравнения сводится к простым, но довольно трудоемким вычислениям и, как показывают примеры, эффективно решается. Замечательный факт состоит в том, что второе уравнение пары позволяет легко отыскать рекурсионный оператор, описывающий иерархию высших симметрий уравнения. Полученные таким способом пары Лакса, на первый взгляд, отличаются от обычных, так как имеют более высокий порядок либо более высокую матричную размерность. На примерах показано, что понижением порядка они сводятся к обычным парам. В качестве примера рассматривается интегрируемая дважды дискретная система экспоненциального типа и ее высшая симметрия, для которой предъявлена пара Лакса и построены законы сохранения.
Критическое поведение моноаксиального кирального гелимагнетика
Authors: Ovchinnikov Aleksandr Sergeevich , Bostrem Irina Gennad'evna , Sinitsyn Vladimir Evgen'evich , Kishine Jun-ichiro
Published: June 2017

Анализируется критическое поведение магнитоупорядоченных фаз в моноаксиальном киральном гелимагнетике, возникающих в слабом внешнем магнитном поле. С помощью формализма уравнений состояния в критической области определяется температурная зависимость параметров порядка для конической фазы и фазы солитонной решетки. Выполнен расчет критических показателей, показано, что они совпадают со значениями показателей в трехмерной модели Гейзенберга.
О 4-импульсе поля точечного заряда в нелинейной электродинамике
Authors: Ependiev Magomed Bukhadievich
Published: June 2017

Доказано, что $4$-импульс электромагнитного поля точечного заряда является $4$-вектором, если лагранжиан поля нелинеен (относительно инвариантов поля), а масса поля конечна. Определен класс лагранжианов, приводящих к ограниченности массы поля.