Multiple Recipients Research Articles

Quantum private broadcasting

In private broadcasting, a single plaintext is broadcast to multiple recipients in an encrypted form, such that each recipient can decrypt locally. When the message is classical, a straightforward solution is to encrypt the plaintext with a single key shared among all parties, and to send to each recipient a copy of the ciphertext. Surprisingly, the analogous method is insufficient in the case where the message is quantum [i.e., in quantum private broadcasting (QPB)]. In this work, we give three solutions to $t$-recipient quantum private broadcasting ($t$-QPB) and compare them in terms of key lengths. The first method is the independent encryption with the quantum one-time pad, which requires a key linear in the number of recipients, $t$. We show that the key length can be decreased to be logarithmic in $t$ by using unitary $t$-designs. Our main contribution is to show that this can be improved to a key length that is logarithmic in the dimension of the symmetric subspace, using a concept that we define of symmetric unitary $t$-designs, which may be of independent interest.

Caregiving Across the Life Course: Life History Findings from the Health and Retirement Study (HRS)

Informal caregiving, defined as unpaid care provided to a relative or friend with some sort of special need, is a topic of research across different disciplines. Previous research highlights the prevalence and heterogeneity of caregivers in terms of their age, gender, relationship with the care recipient, and the duration of care provision. However, most research focuses on a specific episode of caregiving. Little is known about the people who provide care to multiple recipients throughout their own life. To fill this gap, we examined data from the HRS Spring 2017 Life History Mail Survey (N = 3520; age range 50-101 yrs). Participants reported their relationship with people to whom they had provided unpaid care for ≥ 6 months (max 5) and listed the start and end years of care. Compared with people who had not provided care, caregivers (N = 1000, 28%) were more likely to be women, white, and currently widowed. They cared for their parents (67%), spouses (22%), children (11%), or other relatives (16%) and 30% reported providing care two or more times (M = 1.44, SD = 0.81). Respondents, who reported multiple episodes of caregiving were more likely to be women, widowed, aged between 25 and 50 at the time of first providing care. People who first cared for their spouse were less likely to report multiple caregiving episodes comparing with those who cared for parents or children. Future research will examine the health and well-being consequences associated with caregivers’ histories of providing unpaid care to others.

On equilibrium existence in generalized multi-prize nested lottery contests

The generalized multiple-prize nested lottery contest framework has been broadly applied to model noisy competitions that award prizes to multiple recipients. Assuming homogeneous and risk-neutral players, previous studies have typically solved for the symmetric strategy profile that satisfies the first-order condition as the equilibrium solution to the game. The literature has yet to formally establish equilibrium existence because of a technical challenge caused by the presence of multiple prizes. The associated payoff structure dismisses the key property of contests as aggregative games and nullifies the usual approach for equilibrium analysis. We develop an alternative approach to ascertain the property of players' payoff functions without assuming homogeneous and/or risk-neutral players, which enables us to establish equilibrium existence. We then consider a setting that allows for incomplete information and develop an indirect approach to establish equilibrium existence of the Bayesian contest game.

Election Guidelines: Know the Rules

Election Guidelines: Know the Rules

A Gift of Generosity—An Explanation of Organ and Tissue Donation and Transplantation for Muslim Audiences

Diseased Organ and tissue donation and transplantation entails removing organ and tissues from someone (the donor) and transplanting them into another person (the recipient). Transplanting organs and tissues from one person hold the capacity to save or significantly improve the quality of life of multiple recipients. This is a rare opportunity for one to become an organ donor. In 2018, Australia had a population of 24.99 million. A total of 160,909 lives were lost that year; almost half of this death occurred in hospitals. However, a person may only be able to become a donor if their death occurs in a particular way and fulfils a defined set of special criteria—for example, while on the life support machine in an intensive care unit. Because of this, only 1211 people out of the large number of lives lost in 2018 were eligible to be potential organ donors. This is one of reasons we encourage everybody to consider the virtues of organ and tissue donation in any end-of-life discussion. Diseased organ donation occurs only when the clinician is certain that the person has died. The death is diagnosed by neurological criteria or by circulatory criteria which are discussed in detail in the article. This is an unconditional altruistic and non-commercial act. A large number of people are waiting on transplant list in Australia who are suffering from end stage organ failure; some of them will die waiting unless one receives an organ transplantation. Australians are known to be highly generous people. That is why 98% of Australian say ‘Yes’ to become an organ donor when they die. But in reality, only about 64% of families consent for organ donation on an average. There are widespread misconceptions and myths about this subject, mostly due to lack of information and knowledge. I have attempted to explain the steps of diseased organ donation in this article which, hopefully will be able to break some of those misconceptions. I have avoided to discuss living donation which is entirely a different subject. I have only touched on Islamic perspective of organ donation here as multiple Islamic scholars are going to shed lights here. We encourage everybody to ‘Discover’ the facts about organ and tissue donation, to make an informed ‘Decision’ and ‘Discuss’ this with the family. If the family knows the wishes of the loved one, it makes their decision-making process much easier during such a devastating and stressful time.

Factors relating to depressive symptoms of caregivers for older care recipients in Indonesia

ABSTRACT Objectives: Family care is a large part of an informal workforce and there are increasing unmet demands for ageing populations, particularly in low and middle-income country settings. This study investigates relationships and care requirements for older care recipients and their caregivers within the household and identifies factors relating to depressive symptoms among caregivers of older persons.Method: Data were derived from the Indonesian Family Life Survey (IFLS Wave 5). Multiple logistic regressions were used for analyses. Outcomes were Center for Epidemiologic Studies Depression Scale (CES-D score ≥10 as having moderate to severe depressive symptoms).Results: Over half of care recipients aged 50 years and over reported requiring intermediate or high-level care intensity. Primary caregivers were most often spouses for older males and adult children for older females. Factors associated with depressive symptoms among caregivers were not working (adjusted odds ratio, AOR 1.86; 95% Confidence Interval 1.19– 2.90), primary school education (AOR 5.01; 1.96–12.8), living in rural area (AOR 1.38; 1.01–1.88), and having multiple older care recipients in the household (AOR 1.98; 1.43–2.75). Having care recipients with medium or high functional limitation levels (AORs 2.27; 1.51–3.42 and 3.36; 2.00–5.63, respectively) and not receiving household co-resident support were associated with caregivers’ depressive symptoms (AOR 1.32; 1.01–1.89).Conclusion: To meet the anticipated future demands for elderly care, addressing factors relating to depressive symptoms, especially amongst those not working, low education, living in rural areas could help mitigate adverse effects for caregivers. Caregivers could benefit from the provision of adequate support, including screening for depressive symptoms.

A model of the\xa0evolution of equitable offers in n-person dictator games with interbirth intervals

People are often generous even when it is not in their apparent self-interest to do so as demonstrated by numerous experiments using the dictator game (DG). More recent research using DGs has varied the number of dictators and recipients and used these games to investigate the bystander effect and congestible altruism. These studies have found that people are less generous when there are others who could be generous (the bystander effect) and also less generous when there are multiple recipients (congestible altruism) though the sum of their generosity to all recipients increases. A working hypothesis is proposed that the context-sensitive generosity observed in n-person DGs can be explained as equitable behavior. From an evolutionary perspective, explaining the evolution of equitable behavior is challenging at best. To provide an evolutionary explanation, a second working hypothesis is proposed: equitable offers evolve because they reduce resource deficits produced by variability in the accumulation of resources and thereby minimize the length of interbirth intervals (IBIs) and increase fitness. Based on this working hypothesis, an evolutionary model was developed for n-person DGs to investigate the evolution of equitable offers as a resource allocation problem when reproduction is constrained by IBIs. Simulations demonstrated that equitable offers could evolve in group-structured populations when there is a cost (i.e., longer IBIs) to running resource deficits. Mean evolved offers also varied as a function of the number of dictators and recipients in patterns consistent with the bystander effect and congestible altruism. Equitable offers evolved because they reduced resource variability among group members and thereby reduced resource deficits, which insured higher average rates of reproduction for more equitable groups of agents. Implications of these results are discussed.

The Impact of Living Donor Nephrectomy With Multiple Renal Arteries on Graft Function and Complications in Renal Transplantation

The aim of this study was to investigate the early outcome of living donor kidney transplantation using allografts with a single artery and multiple arteries. From February 2018 to December 2019, a total of 62 patients underwent living donor nephrectomy at our institution: 20 multiple artery donor nephrectomies (MADNs) and 42 single artery donor nephrectomies (SADNs). All operations were performed by the same surgeon as the laparoscopic procedure. The MADN and SADN groups were compared regarding donor and recipient hospital stay, operative time, warm ischemia time, and postoperative complications with Clavien-Dindo classification. Graft function was evaluated considering episodes of acute tubular necrosis during the first week, delayed graft function, serum creatinine (SCr), and glomerular filtration rate for 6 months after transplantation. Sixty-two patients were included in this study. There was no difference in terms of age, sex, body mass index, nephrectomy side, smoking status, preoperative SCr, or preoperative glomerular filtration rate between the 2 groups. Warm ischemia time and operation time were statistically significantly higher in the MADN group (P < .001 and P < .001). Regarding graft function, the prevalence of acute tubular necrosis did not differ between groups. There was also no significant difference in the acute rejection or mortality rates after transplantation. Although SCr levels were lower in multiple renal artery recipients, there was no statistical difference during the 6 months of follow-up. Recipient morbidity and mortality were not different between the 2 groups. Renal allograft transplantation with multiple renal arteries can be performed with reasonable complications and acceptable results.

Data Distribution for Multiple Receivers in a Connected Car Environment Using 5G Communication

The development of communication technology has brought changes to various environments. The evolution from 3G to 4G Long-Term Evolution (LTE) was mainly aimed at improving communication speed. However, the evolution from 4G LTE to 5G New Radio (NR) is not aimed at improving speed alone. In addition to the existing communication types, 5G aims to improve communication to support the Internet of Things (IoT), media, and complex content to which things are connected. In such environments, point-to-point communication has a very inefficient structure to allow content providers to transmit data to many content users. In the 5G era, content providers must distribute content to numerous users, and in this process, they need to protect the content. Multireceiver encryption (MRE) is an encryption technology developed for this purpose. MRE allows multiple recipients to decrypt data using their own private key with single encryption of a data provider. With this technology, even if the number of data recipients is 100,000 or 1,000,000, data can be distributed with single encryption. Therefore, while using the existing 1 : 1 encryption method, it is possible to solve the problem of inefficiency in performing encryption for each recipient. However, existing proposed MREs can cause key escrow problems and partial key verification problems. Furthermore, the privacy issues identifying the recipient may arise because anonymity is not available to the recipient. In addition, it is necessary to ensure a fair decryption process for all recipients which a legitimate user cannot decrypt. In this study, we attempted to address these problems, and through our model, it is possible to distribute the data more securely and efficiently in a 5G environment.

First and second pregnancy outcomes in women with class III obesity: An observational cohort study

IntroductionClass III obesity (BMI ≥ 40 kg/m2) during pregnancy predisposes mother and offspring to a range of adverse pregnancy complications and outcomes. Risk profiles vary between pregnancies and are affected by interpregnancy weight gain. We evaluated the risk of adverse outcomes in women with BMI ≥ 40 kg/m2 in first and second pregnancies, and the impact of interpregnancy weight change on this risk. Materials and methodsData were extracted for all women with BMI ≥ 40 kg/m2 at first antenatal visit, who completed antenatal and delivery care for first and second pregnancies in NHS Lothian between 1/1/2009–31/12/2018. Multiple pregnancies and recipients of bariatric surgery were excluded. Results442 pregnancies among 221 women were included. In first pregnancy, median (interquartile range) weight was 117 kg (108.5–126.7), age 28 years (24–31) and BMI 42 kg/m2 (41.0−44.5), 14.4% had gestational diabetes (GDM), 11.3% had pregnancy-induced hypertension and 44.6% had a post-partum haemorrhage (PPH). 20.8% of babies were large for gestational age (LGA, ≥97% centile at birth). In second pregnancy, women were heavier with a median weight of 119.9 kg (109.0−130.0, p = 0.00) with 19.9% gaining over 10 kg. Women were more likely to develop GDM (21.6%, p = 0.02). Babies were heavier with 40% of babies LGA (p < 0.0001). Interpregnancy weight change had no significant impact on GDM, pregnancy induced hypertension, PPH, perinatal mortality or LGA. ConclusionsIn a population of women with BMI ≥ 40 kg/m2, pregnancy complications are common and risk is higher in second pregnancy. The interpregnancy period is a critical time to engage women in health improvement and weight loss strategies to maximise outcomes for mother and offspring.

HLA DR Genome Editing with TALENs in Human iPSCs Produced Immune-Tolerant Dendritic Cells.

Although human induced pluripotent stem cells (iPSCs) can serve as a universal cell source for regenerative medicine, the use of iPSCs in clinical applications is limited by prohibitive costs and prolonged generation time. Moreover, allogeneic iPSC transplantation requires preclusion of mismatches between the donor and recipient human leukocyte antigen (HLA). We, therefore, generated universally compatible immune nonresponsive human iPSCs by gene editing. Transcription activator-like effector nucleases (TALENs) were designed for selective elimination of HLA DR expression. The engineered nucleases completely disrupted the expression of HLA DR on human dermal fibroblast cells (HDF) that did not express HLA DR even after stimulation with IFN-γ. Teratomas formed by HLA DR knockout iPSCs did not express HLA DR, and dendritic cells differentiated from HLA DR knockout iPSCs reduced CD4+ T cell activation. These engineered iPSCs might provide a novel translational approach to treat multiple recipients from a limited number of cell donors.

Buying gifts for multiple recipients: How culture affects whose desires are prioritized

Gift purchasing is an important factor driving the retail industry around the world, and yet, many gift selections do not match recipient preferences. Three studies examine how consumers from different cultures select gifts for multiple recipients and when gifts deviate from recipients’ preferences. Both U.S. and Chinese consumers who are shopping for multiple recipients tend to pass up recipients’ preferred gifts in favor of getting distinct gifts for each recipient, and Chinese givers are more likely than U.S. givers to choose gifts that deviate from recipients’ preferences overall. The criteria that consumers use to decide whose preferences to prioritize differ across cultures. U.S. givers prioritize recipients they like better, but Chinese givers prioritize better-liked recipients less consistently. Chinese prioritize higher-status recipients, but U.S. givers do not. We further show that these national cultural differences in prioritizing higher-status recipients are paralleled by differences in power distance belief.

Developing a databank for multiple transfusion patients: Rh antigen and phenotype distribution among 3000 regular blood donors in Iran

BackgroundRhesus (Rh) blood group system is clinically the most significant protein-based grouping system. The Rh system is of vital importance in blood transfusion, and incompatibility between the donor and recipient leads to alloimmunization. Alloimmunization is commonly seen in multiple-transfusion recipients (e.g. thalassemia patients). There are a few studies about the prevalence of Rh antigens, except for D, in Iran; and regarding the high prevalence of thalassemia in the country, in this study we have determined antigens and phenotypes of the Rh among population of regular blood donors with the aim of developing a detailed Rh databank. Materials and methodsThis cross-sectional study randomly enrolled 3000 regular blood donors from three provinces of Sistan-Balouchestan, Khuzestan and Gilan in Iran, from September 2018 to May 2019. A fully automated system, based on hemagglutination, was used to Rh typing of blood samples. ResultsThe prevalence of Rh antigens were as follows: D: 88.9 %; E: 30.9 %; C: 74.1 %; e: 96.2 %; and c: 72.8 %. The most common antigen and phenotype were "e" and R1r (DCcee), respectively. ConclusionDue to the high rate of alloimmunization incidence against Rh blood group antigens among multiple transfusion recipients, development of regular blood donor's Rh databank can facilitate extensive matching for the Rh antigens and it likely reduces the risk of alloimmunization.

Rotation Forest model modification within the email spam classification

Increased use of email in daily transactions for many businesses or general communication due to its cost-effectiveness has made emails vulnerable to attacks, including spam. Spam emails are unsolicited messages that are very similar to each other and sent to multiple recipients randomly. This study analyzes the Rotation Forest model and modifies it for spam classification problem. Also, the aim of this study is to create a better classifier. To improve classifier stability, the experiments were carried out on Enron spam, Ling spam, and SpamAssasin datasets and evaluated for accuracy, f-measure, precision, and recall.

AMOUN: Asymmetric lightweight cryptographic scheme for wireless group communication

Multi-recipient cryptographic schemes provide secure communication, between one sender and multiple recipients, in a multi-party group. Providing secure multi-party communication is very challenging, especially in dynamic networks. Existing multi-recipient cryptographic schemes pose a variety of limitations. These include high computational overhead for both encryption and decryption, additional communication overhead and high setup cost due to change in membership, and collusion among recipients. In order to overcome these limitations, this paper introduces an efficient asymmetric multi-recipient cryptographic scheme, AMOUN. In the proposed scheme, to better utilize network resources, the sender transmits a ciphertext containing different messages to multiple recipients, where each recipient is only allowed to retrieve its own designated message. Security analysis demonstrates that the proposed scheme is indistinguishable under adaptive chosen plaintext attack. Quantitative analysis reveals that lightweight AMOUN shows lower average computational cost than both RSA and Multi-RSA, for both encryption and decryption, even when the key sizes are four times larger. For a given prime size, in case of encryption, AMOUN shows 98% and 99% lower average computational cost than RSA and Multi-RSA, respectively. For decryption, AMOUN shows a performance improvement of 99% compared to RSA and Multi-RSA.

Broadcast Proxy Reencryption Based on Certificateless Public Key Cryptography for Secure Data Sharing

Broadcast proxy reencryption (BPRE), which combines broadcast encryption (BE) and proxy reencryption (PRE), is a technology used for the redistribution of data uploaded on the cloud to multiple users. BPRE reencrypts data encrypted by the distributor and then uploads it to the cloud into a ciphertext that at a later stage targets multiple recipients. As a result of this, flexible data sharing is possible for multiple recipients. However, various inefficiencies and vulnerabilities of the BE, such as the recipient anonymity problem and the key escrow problem, also creep into BPRE. Our aim in this study was to address this problem of the existing BPRE technology. The partial key verification problem that appeared in the process of solving the key escrow problem was solved, and the computational efficiency was improved by not using bilinear pairing, which requires a lot of computation time.

Coded-MPMC: One-to-Many Transfer Using Multipath Multicast With Sender Coding

One-to-many transfers in a fast and efficient manner are essential to meet the growing need for duplicating, migrating, or sharing bulk data among servers in a datacenter and across geographically distributed datacenters. Some existing works utilize multiple multicast trees for a one-to-many transfer request to increase network link utilization and its transfer throughput. However, since those schemes do not fully utilize the max-flow value of transmission from a single sender to each recipient, there is room for each recipient to retrieve data more quickly. Therefore, assuming fully-controlled networks with full-duplex links, we pose a problem to find a set of multicast flows with an allocation of block-wise transmissions by which each of multiple recipients with diverse max-flow values from the sender can utilize its own max-flow value. Based on that, assuming a sender-side coding capability on file blocks, we design a schedule of block transmissions over multiple phases by which each recipient can achieve a lower-bound of its file retrieval completion time, i.e., the file size divided by its own max-flow value. This paper presents the coded Multipath Multicast (Coded-MPMC) for one-to-many transfers with heuristic procedures to find a desired set of multicast flows on which block transmissions are scheduled. Through extensive simulations on large-scale real-world network topologies and different types of randomly-generated synthetic topologies, the proposed method is shown to design a desired schedule efficiently. A preliminary implementation on OpenFlow is also reported to show the fundamental feasibility of Coded-MPMC.

Care2Caregiver: A Peer Support Helpline for Caregivers of Persons Living With Dementia

Caregivers of persons with Alzheimer’s disease and Related Dementia (CADRD) provide a significant amount of support to their family members, however, experience many challenges and stress that impacts their quality of life, emotional and physical well-being. They also have difficulty accessing services. Peers supporters, or CADRD with specialized training, are an important resource to help alleviate stress related to caregiving and focus on wellbeing, yet few studies have examined peer support. Our retrospective cohort study examined four years of data collected from a peer support helpline for CADRD in a northeastern state. Data included: demographics, presenting issues, services provided to assess for changes across time and call frequency. The Peer Specialists were CADRD who received specialized training and supervision to provide telephonic peer support. Caregivers were primarily female, and the average age of caller increased significantly over time. Issues related to personal emotional wellbeing was the primary reason for the call. The primary type of support provided was peer support interactions, follow-up calls, and links to resources focused on caregiver well-being. Callers reported distress from offering care to multiple recipients. Electronic follow-up (e.g. email and chat) increased over time. Peer support helpline programs have the potential to address the practical, physical, social and emotional needs of CADRD in the location of the caregiver choice. This model has potential to reach the growing number CADRDs via an array of web-based services including chat, email and online support, which can help overcome transportation and other logistical barriers to support.

Attribute-based encryption and sticky policies for data access control in a smart home scenario: a comparison on networked smart object middleware

Regulating the access to the Internet of Things (IoT) network’s resources is a complex-prone task, which requires to pay a great attention on how policies are defined, shared, and enforced. The present paper considers the specific context of a smart home, which represents one of the main IoT application domains, and it focuses on two solutions proposed in the literature to cope with the aforementioned issues. On the one side, approaches based on attribute-based encryption (ABE) allow one to encrypt data for multiple recipients, in such a way that only those recipients whose attributes satisfy a given access policy can decrypt afterward. ABE guarantees a high level of customization due to the variety of attributes which can be defined, and it is also flexible enough to be adapted to different kinds of scenarios. On the other side, approaches based on sticky policies allow to attach an access policy directly to the data itself, and to employ a trusted authority to evaluate and enforce the policy itself. Sticky policies also guarantee a highly distributed and customizable enforcement of access control rules. In this paper, we compare the advantages and the drawbacks in terms of performance and robustness of such two techniques by means of their integration within the prototype of an IoT middleware, named networked smart object. Hence, the effectiveness of the presented solutions is validated by means of a real test-bed in the smart home scenario, in terms of storage occupancy, CPU load, and data retrieval delay. The final goal is to reveal the best approach to be used depending on the application’s requirements.

Eye Banking: One Cornea for Multiple Recipients.

Corneal transplantation is the most frequently performed transplant procedure. In much of the world, the demand for donor tissue heavily outstrips supply. With developments within lamellar corneal graft surgery, the use of split corneal donor tissue to increase donor tissue supply seems a pragmatic solution to reduce the supply and demand mismatch. This is especially important with tissue supply expected to be affected by the COVID-19 pandemic. A literature review of techniques was performed, enabling multiple transplants to be derived from a single donor and simulation of a model to quantify the number of corneas potentially saved. Studies on splitting corneal donor tissue have demonstrated that up to 5 recipients may benefit from 1 donor scleral button. The impact of splitting donor tissue may provide a saving of up to 25.3% of donor graft tissue. Splitting and preparing the donor tissue within an eye bank will improve tissue validation and donor tissue availability and may increase surgeon efficiency.