Academic literature on the topic 'Baby Step'

This master thesis is about Elliptic Curve Digital Signature Algorithm or ECDSA and two of the known attacks on this security system. The purpose of this thesis is to find points that are likely to be points of high order on an elliptic curve. If we have a point P of high order and if Q = mP, then we have a large set of possible values of m. Therefore it is hard to solve the Elliptic Curve Discrete Logarithm Problem or ECDLP. We have investigated on the time of finding the solution of ECDLP for a certain amount of elliptic curves based on the order of the point which is used to create the digital signatures by those elliptic curves. Method: Algebraic Structure of elliptic curves over finite fields and Discrete logarithms. This has been done by two types of attacks namely Baby Step, Giant Step and Pollard’s Rho and all of the programming parts has been done by means of Mathematica. Conclusion: We have come into a conclusion of having the probable good points which are the points of high order on elliptic curves through the mentioned attacks in which solving the ECDLP is harder if these points have been used in generating the digital signature. These probable good points can be estimated by means of a function we have come up with. The input of this function is the order of the point and the output is the time of finding the answer of ECDLP.

Background: Breastfeeding is a tremendously important public health topic. Breastfeeding is associated with a myriad of health benefits on nearly all levels within the social ecological model (infants, mothers, families, workplaces, communities and societies). Scientific evidence supports that breastfeeding is associated with decreased obesity and other very costly health conditions that occur across the lifespan. The World Health Organization published 10 guidelines that comprise the Baby Friendly Hospital Initiative [BFHI] standards—which identify birthing facility-level elements that are associated with enhanced breastfeeding adoption rates. Methods: The purpose of this study was to determine the extent to which birthing facilities in Atlanta incorporate BFHI elements. Lactation policies among hospitals in the City of Atlanta with maternity wards were solicited, reviewed, and rated by two independent reviewers. Additional observations about environmental supports for breastfeeding were also noted. Results: Four out of 5 eligible hospitals provided their lactation policies for review (80%). Eight of out 10 BFHI elements were present in the 4 hospital policies. One element not present was distribution of reinforcing/educational materials to new mothers—although it was evident in an appendix. Another element that was not clearly stated in one policy was which states that breastfeeding initiation should occur within the first half hour after birth. Observations by reviewers included that ¾ (75%) of study sample were in the midst of drafting new policies. Another note was that ¾ (75%) of study sample was supported by a Centers for Disease Control and Prevention (CDC)/National Initiative for Children’s Healthcare Quality (NICHQ) effort—Best Fed Beginnings. Conclusions: This study is important as it addresses an unexplored question. Establishing such a baseline reveals that while nearly all the BFHI elements are present within the participating City of Atlanta hospitals, the administrative barriers that pursuit of BFHI accreditation poses should be considered. Given the fact that no hospital in Georgia has BFHI accreditation underscores an important new direction for public health researchers’ attention.

Bakgrund: Amning främjar hälsan hos både mammor och barn oavse7 var de bor i världen. Syfte: Syftet var a7 undersöka hur mammor i Sverige upplever råden och stödet kring sin amning från hälso- och sjukvårdspersonal. Metod: En intervjustudie genomfördes under våren 2021 med tio kvinnor med erfarenhet av amning, bosa7a i Sverige. Kvinnorna var mellan 27 och 43 år och rekryterades genom sociala medier online. Under intervjun användes en semi-strukturerad frågeguide. Intervjuerna varade mellan 20 och 52 minuter och skedde via datorprogrammet Zoom. Intervjuerna transkriberades och analyserades med innehållsanalys. Resultat: Analysen mynnade ut i två övergripande teman; Empatiskt förhållningssä7 samt Negligerande och okunskap vilka illustrerade kvinnornas upplevelser av personalens bemötande rörande amning. Dessa teman visar a7 närvarande personal som ser varje individ, pålitlig information och a7 bli stärkt i och få tilltro till sin amning skapade tillit till vården, medan stressad eller oengagerad personal, brist på information och hjälp, och känslor av ensamhet gav upphov till en övergripande känsla av övergivenhet. Även hälsoproblem både fysiska och psykiska gjorde a7 amningsperioden kunde kännas tung och svår. Slutsats: Kvinnornas upplevelser av vårdpersonalens bemötande kring amning illustrerar två upplevelsevärldar som handlar om Empatiskt förhållningssä7 versus Negligerande och okunskap, med konsekvenser som kan vara avgörande för hur väl amningen faller ut. Individanpassat amningsstöd är av central betydelse för a7 främja amning.<br><p>Betyg i Ladok 210601.</p>

Syftet med denna studie var att undersöka om en BB-avdelning i Mellansverige uppfyllde UNICEF/WHO´s kriterier för en amningsvänlig vård, samt att jämföra resultaten med tidigare utvärderingar från åren 1996, 1997, 1998 och 2002. Syftet var också att undersöka vad som påverkat mammorna i beslutet att vilja amma. Amningsvänlig vård utgår från ”Tio steg till lyckad amning” och är en global amningsstrategi. Studien genomfördes i form av intervjuer med 40 nyförlösta mammor samt 22 intervjuer med personal. Vidare gjordes observationer på BB-avdelningen samt genomgång av avdelningens skrivna material angående amning, riktat till personal och mammor. Kriterierna för att amningsvänlig vård bedrivs är att, åtta av tio steg i amningsstrategin ska vara uppfyllda. Den undersökta avdelningen uppfyllde fem av de tio stegen. Genomgående i studien framkom att personalen hade goda praktiska amningskunskaper. Mammornas kunskap om hur de upprätthöll amningen var inte tillräckliga. Vidare hade inte mammorna fått tillräcklig kännedom om var de kunde vända sig för att få råd och stöd angående amning efter hemgång. Resultatet var jämförbart med studierna från 1996 och 2002, men en försämring jämfört med studierna 1997 och 1998 då de klarade åtta respektive nio av de tio stegen. Mammorna tillfrågades också om vad som påverkat dem mest i sitt beslut att amma. För förstföderskorna var det rådgivningen de fått på MVC och för omföderskor betydde tidigare erfarenheter mest.

High quality infant and toddler (IT) child care has repeatedly been linked to better outcomes for children. However, in the U.S., IT child care has also been plagued by poor quality. Using a mixed-methods design, the purpose of this study was to provide an indepth explanation of quality change in IT classrooms and the myriad of factors that contribute to higher quality. Framed in an ecological model that views quality as the product and interaction of process, structural, and caregiver characteristics, this study addressed the impact of a variety of variables on quality change. The sample was comprised of 86 classrooms nested within 48 centers that participated in Baby Steps, a quality improvement project administered by the Utah Office of Child Care. Quantitative data included ITERS-R scores, wages, turnover, capacity, geographic location, and parent fees collected between 2003 and 2010 as part of the Baby Steps Project. Seven center directors completed semi-structured interviews that provided an insider perspective on their perceptions of the barriers and contributors to improved quality. A mixed model analysis was used to examine quality change over time. Results indicate that classroom quality scores (as measured by the ITERS-R) did increase by the second year of participation in Baby Steps; however, subsequent years of participation did not lead to significantly higher scores. Specialized training also appears to contribute to higher quality but high turnover was associated with lower quality programs. Non-urban programs appeared to be especially receptive to the intervention. Center directors echoed these findings and spoke to the

Bakgrund: Baby Friendly Hospital Initiativ bygger på Tio steg till lyckad amning och lanserades år 1991 i Sverige. Efter detta sågs en ökning av amningsfrekvensen. Nu 20 år efter införandet av Tio steg till lyckad amning sjunker amningsfrekvensen. Studier har visat att amningsutfallet påverkas av hur amningen initieras samt det stöd kvinnan får från vårdpersonal, partner och närstående. Syfte: Syftet med denna studie var att beskriva nyblivna mödrars erfarenheter av förberedelse och initiering av amning. Metod: En enkätstudie med slutna frågor där det fanns möjlighet till egna kommentarer på ett flertal av frågorna. Enkäten delades ut till nyblivna mödrar vid efterkontrollen på kvinnohälsovårdsmottagningen. Det var 98 kvinnor som deltog i studien. Svaren analyserades med statistikprogrammet SPSS version 18. Resultatet beskrivs med deskriptiv statistik och Chi-2 test användes. Resultat: Totalt ammade 64,9 % av kvinnorna helt vid efterkontrollen och 23,7 % ammade delvis. På kvinnohälsovårdsmottagningen hade de flesta kvinnorna diskuterat amning med sin barnmorska. Kvinnorna sökte även information själva på internet, i böcker, tidningar och hos närstående. Förstföderskorna sökte information i större utsträckning än omföderskorna. Drygt hälften av kvinnorna hade upplevt ett tillräckligt stöd från vårdpersonalen kring amningen och majoriteten av kvinnorna uppgav att deras partner var positivt inställd till amning. På BB hade 42,8 % av barnen tillmatats med bröstmjölksersättning och av dessa hade ca hälften fått det på medicinska indikationer och hälften hade fått det utan medicinsk indikation. Majoriteten av barnen använde tröstnapp vid efterkontrollen. Slutsats: Till stor del följs Tio steg till lyckad amning, men på vissa punkter ses brister i följsamheten. Kvinnorna hade önskat mer information och stöd i initieringen av amningen. Nyfödda barn tillmatades med bröstmjölksersättning utan medicinsk indikation och många barn introducerades för tröstnapp inom 2 veckor från födelsen.

Elliptic curves were first proposed as a basis for public key cryptography in the mid 1980's. They provide public key cryptosystems based on the difficulty of the elliptic curve discrete logarithm problem (ECDLP) , which is so called because of its similarity to the discrete logarithm problem (DLP) over the integers modulo a large prime. One benefit of elliptic curve cryptosystems (ECCs) is that they can use a much shorter key length than other public key cryptosystems to provide an equivalent level of security. For example, 160 bit ECCs are believed to provide about the same level of security as 1024 bit RSA. Also, the level of security provided by an ECC increases faster with key size than for integer based discrete logarithm (dl) or RSA cryptosystems. ECCs can also provide a faster implementation than RSA or dl systems, and use less bandwidth and power. These issues can be crucial in lightweight applications such as smart cards. In the last few years, ECCs have been included or proposed for inclusion in internationally recognized standards. Thus elliptic curve cryptography is set to become an integral part of lightweight applications in the immediate future. This thesis presents an analysis of several important issues for ECCs on lightweight devices. It begins with an introduction to elliptic curves and the algorithms required to implement an ECC. It then gives an analysis of the speed, code size and memory usage of various possible implementation options. Enough details are presented to enable an implementer to choose for implementation those algorithms which give the greatest speed whilst conforming to the code size and ram restrictions of a particular lightweight device. Recommendations are made for new functions to be included on coprocessors for lightweight devices to support ECC implementations Another issue of concern for implementers is the side-channel attacks that have recently been proposed. They obtain information about the cryptosystem by measuring side-channel information such as power consumption and processing time and the information is then used to break implementations that have not incorporated appropriate defences. A new method of defence to protect an implementation from the simple power analysis (spa) method of attack is presented in this thesis. It requires 44% fewer additions and 11% more doublings than the commonly recommended defence of performing a point addition in every loop of the binary scalar multiplication algorithm. The algorithm forms a contribution to the current range of possible spa defences which has a good speed but low memory usage. Another topic of paramount importance to ECCs for lightweight applications is whether the security of fixed curves is equivalent to that of random curves. Because of the inability of lightweight devices to generate secure random curves, fixed curves are used in such devices. These curves provide the additional advantage of requiring less bandwidth, code size and processing time. However, it is intuitively obvious that a large precomputation to aid in the breaking of the elliptic curve discrete logarithm problem (ECDLP) can be made for a fixed curve which would be unavailable for a random curve. Therefore, it would appear that fixed curves are less secure than random curves, but quantifying the loss of security is much more difficult. The thesis performs an examination of fixed curve security taking this observation into account, and includes a definition of equivalent security and an analysis of a variation of Pollard's rho method where computations from solutions of previous ECDLPs can be used to solve subsequent ECDLPs on the same curve. A lower bound on the expected time to solve such ECDLPs using this method is presented, as well as an approximation of the expected time remaining to solve an ECDLP when a given size of precomputation is available. It is concluded that adding a total of 11 bits to the size of a fixed curve provides an equivalent level of security compared to random curves. The final part of the thesis deals with proofs of security of key exchange protocols in the Canetti-Krawczyk proof model. This model has been used since it offers the advantage of a modular proof with reusable components. Firstly a password-based authentication mechanism and its security proof are discussed, followed by an analysis of the use of the authentication mechanism in key exchange protocols. The Canetti-Krawczyk model is then used to examine secure tripartite (three party) key exchange protocols. Tripartite key exchange protocols are particularly suited to ECCs because of the availability of bilinear mappings on elliptic curves, which allow more efficient tripartite key exchange protocols.

The natural practice of breastfeeding has been strongly noted as one of the most cost-effective, health promoting, disease-prevention strategies of the 21st century. Although primary health organizations recommend exclusive breastfeeding for the first 6 months of life with added complementary foods and continued breastfeeding up to 2 years of age or longer, many mothers do not breastfeed their infants for the recommendation length of time. Applied policies and health practices, such as those described under the 10 Steps to Successful Breastfeeding and The International Code of Marketing of Breast Milk Substitutes, have been noted as contributing factors that can considerably impact the manner which women choose to feed their infants. A cross-sectional methodology assessed associations between maternity health practices and breastfeeding duration among women birthing in the United States. A secondary data analysis of the Infant Feeding Practice Study II and its Year 6 Follow-Up was conducted using IBM SPSS Statistics Version 24. Procedures for data analysis included frequencies, Ï?2 tests, and ordinal logistic regressions. Outcomes revealed that feeding infants any formula during their hospital stay drastically reduces the likelihood for prolonged breastfeeding duration. Study results also concluded that offering a pacifier to infants during their hospital stay reduced the length of breastfeeding duration. This study confirms many of the primary breastfeeding practices that are at the frontline of maternity patient care in the United States. Establishing well-grounded practices that aid in the long-term duration of breastfeeding could help save lives and improve child and maternal health outcomes within the United States.

Optical parameters measured via absorption spectroscopy and high-resolution fluorescence spectroscopy were used to characterize dissolved organic matter (DOM) in the springshed of Kings Bay, a spring-fed estuary located on Florida's Springs Coast. Over the past 40 years, springs supplying groundwater to Kings Bay have shown an increase in nitrate concentration. The overall goal of this project was to fingerprint wells and spring sites with elevated nitrogen concentrations using CDOM optical properties and establish relationships between nutrient and optical parameters. Samples were obtained from various sites: springs, Kings Bay surface (KBS), wells, coastal waters in and at the mouth of Crystal River (Coast) and lakes and rivers (LNR), during dry and wet seasons. The relationships between the environmental parameters and traditional optical parameters which provide insight into source characteristics were analyzed. Excitation emission matrix spectroscopy (EEMS) provided information about the concentration and chemical nature of organic matter in the study area. CDOM optical properties combined with salinity clearly separated the sources of fixed nitrogen in the Bay. Northern springs with elevated dissolved inorganic nitrogen (DIN) concentration had lower salinities and showed a presence of protein peaks. CDOM concentration was negatively correlated with total nitrogen (TN) and DIN, which suggests that these are subjected to anthropogenic influences. Humic peaks dominated the composition of the southern springs. CDOM concentrations were much higher than in the northern springs and there was a positive correlation between CDOM and both TN and DIN. These findings suggest that the fixed nitrogen in the southern springs is naturally occurring organic matter and the low concentrations may partially be a result of subsurface mixing of saltwater and freshwater in the aquifer. Thus, hypothesis testing showed that there was a significant difference between northern and southern springs Hypothesis testing also showed that there is a significant and unexpected positive relationship between CDOM and salinity studying Kings Bay, which is due to the low CDOM concentration in the springs discharging fresh water. This unique dataset also determined that the intercept of the mixing line was significantly different form zero. This indicates that CDOM is present and detectable at very low concentrations. Parallel Factor Analysis (PARAFAC) was used to evaluate CDOM composition from excitation emission matrix spectra (EEMs) and five components were identified: two humic, two marine humic, and one protein-like. The marine-like components, peak M, were produced in the marine environment and in meteoric groundwater. The study found a unique groundwater marker for coastal regions. Northern Kings Bay sites were characterized by a protein-like component, which has been associated with wastewater. Additional optical and environmental parameters were used in discriminate analysis, which successfully identified the CDOM markers for both natural and anthropogenic sources of nutrients in the environment. It is vital to improve the analysis of water, nutrients, and carbon from groundwater discharge into the coastal zone. Elevated DIN concentrations in groundwater are a widespread problem in Florida and over the past 30 years many spring waters have shown an increase in DIN concentrations. Nutrient discharge into delicate coastal areas can lead to ecological concerns. Investigating CDOM and nutrient distribution together can be a beneficial tool that can help differentiate sources from riverine/lacustrine, estuarine, marine, groundwater, and sewage impacted categories.