Initial Results Research Articles

Inhibitory Control Training for Anxiety and Math Achievement in Primary School Children: Protocol for a Proof-of-Concept Study.

Cognitive control training (CCT) has shown potential to reduce emotional vulnerability in adults and adolescents. However, there is scant literature testing the efficacy of CCT for the reduction of anxiety and transferring the effects to educational outcomes in children. Building on the evidence that a greater ability to suppress a prepotent response (inhibitory control) is associated with higher math achievement in children, it is plausible that training inhibitory processes using a CCT paradigm may be beneficial for reducing anxiety, improving inhibitory control, and in turn increasing math achievement. This proof-of-concept study aims to investigate the efficacy of 15 sessions of inhibitory control training for reduction in anxiety and improvement in math achievement in primary school children. We will use a 2 (group: CCT, adaptive Go/No-Go vs active control, low-load task) multiplied by 4 (time: pre- vs posttraining vs 1-month vs 3-month follow-up) randomized design in a nonselected sample of 100 children aged 8-10 years. Both groups will complete 10 minutes of daily training for 3 weeks at school. The dependent variables will be anxiety and correlates (Spence Children's Anxiety Scale, Penn State Worry Questionnaire for Children, Revised Children's Anxiety and Depression Scale, Child Response Style Questionnaire, and Modified Abbreviated Math Anxiety Scale), inhibitory control (Go/No-Go task), shifting (color-shape shifting task), updating (n-back task), and math achievement (Applied Problems, Calculation, and Math Facts Fluency subtests from the Woodcock-Johnson IV Tests of Achievement). We opened enrollment in September 2023. The initial results are expected to be published in late 2024. We predict that children in the CCT group will show a reduction in emotional symptoms; improvements in inhibition, shifting, and updating performance; and advances in math achievement from pre- to posttraining, and that these effects will be maintained at 1- and 3-month follow-ups, compared to children in the active control group. The CCT paradigm used in our study will provide a greater understanding of the emotional and cognitive transfer effects on children and inform future work. Specifically, the findings will advance the knowledge of deploying inhibitory control training with children and provide valuable insights into its use for reducing anxiety and advancing math achievement. Open Science Framework ofs.io/de2qa; https://doi.org/10.17605/OSF.IO/DE2QA. PRR1-10.2196/52929.

Translation and Validation of the City Birth Trauma Scale With Lithuanian Postpartum Women: Findings and Initial Results.

The childbirth experience and birth-related trauma are influenced by various factors, including country, healthcare system, a woman's history of traumatic experiences, and the study's design and instruments. This study aimed to validate the City Birth Trauma scale for Lithuanian women post-childbirth. Using a descriptive, cross-sectional survey with a nonprobability sample of 794 women who gave birth from 2020-2021, the study found good validity, reliability, and presented the prevalence of birth-related stress symptoms. A bifactor model, consisting of a general birth trauma factor and two specific factors for birth-related symptoms and general symptoms of PTSD, showed the best model fit. The Lithuanian version of the City Birth Trauma scale can be effectively used in research and clinical practice to identify birth-related trauma symptoms in women after giving birth.

The Life After Stroke In Northern Sweden Study (LASINS): Methodology, cohort demographics and initial results.

To advance rehabilitation we need a comprehensive understanding of functioning and disability of people after stroke. To present an overview of the methodology of the Life After Stroke In Northern Sweden Study, compare participants and non-participants regarding gender and age, and describe baseline sociodemographics, stroke characteristics and the participants' self-rated degree of recovery. Data were collected through a study specific questionnaire, from the participants' medical records and with internationally established self-assessment tools focusing on sleep disturbances, depressive symptoms, fatigue, physical activity, and remaining physical and cognitive impairments, activity limitations, participation restrictions and life satisfaction. Of 301 potential participants, 160 comprise the final sample (response rate 53%; 86 men and 74 women, mean age 73 years±11, mean time since stroke onset 35 months±11; 18- 61). Most participants had an ischemic stroke (87%), were retired (84%), cohabitant (63%) and walked independently (71%). The mean self-rated degree of recovery was 75 (SD±24; 0- 100). These baseline data together with forthcoming studies will describe stroke-related impairments, activity limitations, participation restrictions and life satisfaction more than one year after stroke, and deepen our understanding of factors of importance for a healthy and successful life after stroke.

NBI optimization on SMART and implications for scenario development

The SMall Aspect Ratio Tokamak (SMART) under commissioning at the University of Seville, Spain, aims to explore confinement properties and possible advantages in confinement for compact/spherical tokamaks operating at negative vs. positive triangularity. This work explores the benefits of auxiliary heating through Neutral Beam Injection (NBI) for SMART scenarios beyond the initial Ohmic phase of operations, in support of the device’s mission. Expected values of electron and ion temperature achievable with NBI heating are first predicted for the current flat-top phase, including modeling to optimize the NBI injection geometry to maximize NBI absorption and minimize losses for a given equilibrium. Simulations are then extended for a selected case to cover the current ramp-up phase. Differences with results obtained for the flat-top phase indicate the importance of determining the plasma evolution over time, as well as self-consistently determining the edge plasma parameters for reliable time-dependent simulations. Initial simulation results indicate the advantage of auxiliary NBI heating to achieve nearly double values of pressure and stored energy compared to Ohmic discharges, thus significantly increasing the device’s performance. The scenarios developed in this work will also contribute to diagnostic development and optimization for SMART, as well as providing test cases for initial predictions of macro- and micro-instabilities.

An Analysis of Parental Quality of Life Following an Autism Diagnosis for their Children

The primary goal of this study's contents is to systematically review earlier studies on the quality of life in parents of autistic children and provide a significant analysis of the ways in which societal themes and facets influence the current state of affairs. Using the four dimensions of the quality of life—the physical, psychological, social, and environmental domains—as a guide, this analysis has attempted to address significant and noteworthy aspects as indicated by World Health Organization (2012).In the present study, I intend to explore the parents’ opinions regarding their quality of life towards diagnosis of their children with autism. This systematic review, which adhered to PRISMA principles, sought to find and evaluate pertinent studies on parents of autistic children's quality of life (QoL). Twenty-five studies were found to be potentially relevant after a preliminary search. 12 studies were eliminated after the preset inclusion and exclusion criteria were applied because they did not meet methodological requirements, did not focus on the same demographic, or did not fall within the relevant timeframe. As a result, six papers were left in the final pool for additional synthesis and analysis. According to this review, mothers reported lower levels of physical, psychological, and environmental comfort than fathers. In the psychological and physical dimensions of QOL level, mothers and fathers differ significantly from one another. The majority of parents expressed dissatisfaction over their family life and relationships being negatively impacted by their inability to obtain funds, specialist intervention programs, and prompt diagnosis. Nonetheless, parents concurrently expressed favourable views of transformation resulting from diagnosis and successful intervention. Families with children diagnosed with autism spectrum disorder may face additional stressors due to delays and challenges in diagnosis and service availability. Families' social and professional lives, as well as their connections with friends and relatives, are all impacted by raising a child with autism. The study suggests that raising awareness about the quality of life for families of children with autism is necessary. To protect the most vulnerable families, the state should enact laws and policies pertaining to disabilities and educate the public about the various kinds of disabilities. These initial results add to our understanding of the perspectives of parents of disabled children on their child's quality of life.

Implementing Privacy Homomorphism with Random Encoding and Computation Controlled by a Remote Secure Server

Remote IoT devices face significant security risks due to their inherent physical vulnerability. An adversarial actor with sufficient capability can monitor the devices or exfiltrate data to access sensitive information. Remotely deployed devices such as sensors need enhanced resilience against memory leakage if performing privileged tasks. To increase the security and trust of these devices we present a novel framework implementing a privacy homomorphism which creates sensor data directly in an encoded format. The sensor data is permuted at the time of creation in a manner which appears random to an observer. A separate secure server in communication with the device provides necessary information which allows the device to perform processing on the encoded data but does not allow decoding of the result. The device transmits the encoded results to the secure server which maintains the ability to interpret the results. In this paper we show how this framework works for an image sensor calculating differences between a stream of images, with initial results showing an overhead as low as only 266% in terms of throughput when compared to computing on standard unencoded numbers such as two’s complement. We further show 5,000x speedup over a recent homomorphic encryption ASIC.

Stereo-electroencephalography-guided three-dimensional radiofrequency thermocoagulation for mesial temporal lobe epilepsy with hippocampal sclerosis: A retrospective study with long-term follow-up.

Stereo-electroencephalography-guided three-dimensional radiofrequency thermocoagulation (SEEG-3D RFTC) is a minimally invasive treatment for mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS). This study aimed to investigate the long-term prognosis after SEEG-3D RFTC treatment in patients with MTLE-HS. This single-center retrospective study included 28 patients with MTLE-HS treated with SEEG-3D RFTC from January 2016 to May 2018. Postoperative curative effects were evaluated using the Engel classification, and the patients were followed up for 5 years. The proportions of patients categorized as Engel I between 1 and 5 years after surgery were 72.41% (12 months after surgery), 67.86% (18 months after surgery), 62.07% (24 months after surgery), 50.00% (36 months after surgery), 42.86% (48 months after surgery), and 42.86% (60 months after surgery), respectively. Regarding long-term efficacy, based on the Engel classification, SEEG-3D RFTC showed room for improvement. This was the first study to evaluate the efficacy of SEEG-3D RFTC for MTLE-HS with long-term follow-up. SEEG-3D RFTC is a promising alternative for patients with MTLE-HS. This study explored the potential of stereoelectroencephalography-guided three-dimensional radiofrequency thermocoagulation, a minimally invasive approach, for treating medial temporal lobe epilepsy with hippocampal sclerosis. Involving 28 patients, the research tracked the treatment's success over five years using the Engel classification. Initial results were promising, with 72.41% of patients achieving the most favorable outcome (Engel I) at one year. While there was a gradual decrease in this proportion over time, 42.86% of patients maintained this positive outcome at five years, highlighting the treatment's potential for long-term efficacy.

Adverse Effects After Prehospital Administration of Naloxone by Bystanders: A Preliminary Study.

Opioid use disorder is a cause of significant morbidity and mortality. In order to reverse opioid overdose as quickly as possible, many institutions and municipalities have encouraged people with no professional medical training to carry and administer naloxone. This study sought to provide preliminary data for research into the rates of adverse effects of naloxone when administered by bystanders compared to Emergency Medical Services (EMS) personnel, since this question has not been studied previously. This was a retrospective cohort study performed at an urban, tertiary, academic medical center that operates its own EMS service. A consecutive sample of patients presenting to EMS with opioid overdose requiring naloxone was separated into two groups based on whether naloxone was administered by bystanders or by EMS personnel. Each group was analyzed to determine the incidence of four pre-specified adverse events. There was no significant difference in the rate of adverse events between the bystander (19%) and EMS (16%) groups (OR = 1.23; 95% CI, 0.63 - 2.32; P = .499) in this small sample. Based on these initial results, a study would need a sample size of 6,188 in order to reach this conclusion with 80% power. Similarly, there were no significant differences in the rates of any of the individual adverse events. Secondary analysis of patients' demographics showed differences between the two groups which generate hypotheses for further investigation of disparities in naloxone administration. This preliminary study provides foundational data for further investigation of naloxone administration by bystanders. Adverse events after the prehospital administration of naloxone are rare, and future studies will require large sample sizes. These preliminary data did not demonstrate a statistically significant difference in adverse event rates when comparing naloxone administration by bystanders and EMS clinicians. This study provides data that will be useful for conducting further research on multiple facets of this topic.

Infiltration of artificial intelligence in education

The economic sophistication of countries, technological advancements, and the influence of social networks and the media on our lives all accelerate the development of artificial intelligence (AI), which is gradually becoming established in everyday life. Through applied research, we try to point out how easy it is to use AI in the student's life when processing school assignments, with the fact that the quality of the output is sometimes indistinguishable from real students' written work. The initial results of this study show that AI-created works within general education subjects are almost indistinguishable from students' works and also suggest that teachers' recognition of AI-created works is more complex than expected and thus opened a discussion on the importance of comprehensive education and support of teachers.

Through each other's eyes: initial results and protocol for the co-design of an observational measure of adolescent-parent interaction using first-person perspective

BackgroundCurrent observational methods to understand adolescent-parent interaction are limited in terms of ecological and content validity. We outline initial results and a protocol for future work from a programme of work to: (1) establish a new method for data capture of adolescent-parent interaction at home using wearable cameras and; (2) develop a new relevant and comprehensive observational micro-coding scheme. In Part 1, we report our completed preliminary work, comprised of an initial scoping review, and public engagement work. In Part 2, we present a protocol for the development of the new measure.MethodsPart 1—We searched Pubmed for existing observational measures of adolescent-parent interaction for the scoping review. We also undertook public engagement work utilising a mobile research van, taken to multiple locations around Bristol, UK to engage with a variety of populations through interactive methods. Part 2—Our protocol describes plans for: (1) A systematic review of the psychometric properties of observational measures of adolescent-parent interaction; (2) Focussed public engagement workshops; (3) Harmonisation of information from existing coding schemes and literature with information from public engagement with adolescents and parents; (4) A pilot study to assess the acceptability and feasibility of the method; (5) Development of a coding scheme in consultation with expert and lay panels, and through real-life application to recorded videos from a pilot sample.ResultsScoping review: we identified 21 adolescent-parent observational schemes, of which eight used micro-coding and 13 used globalcoding schemes. The majority of micro-coding schemes were not developed specifically for adolescents. Most studies used conflict or problem-solving tasks, which may not adequately capture positive adolescent-parent interactions. The mobile van event received views from 234 young people and/or parents. Families were positive about taking part in research using headcams. “Trust” and “understanding” were most frequently reported as important adolescent-parent relationship constructs.ConclusionsThis work represents the first attempt to truly co-design a method to assess parenting in adolescence. We hope to develop an observational measure using novel technological methods that can be used across a range of research and therapeutic settings.

Abstract B052: Ovarian cancer risk prediction: a systematic assessment of the state of the art and development of a new model

Abstract B052: Ovarian cancer risk prediction: a systematic assessment of the state of the art and development of a new model

Learning Far Beyond the Classroom: An Exploratory Study of Self-Directed Learning Activities and Strategies of Adult L2 Learners in Japan

There exists a language learning industry in Japan that caters to adult learners. However, a significant number of adults do not engage in such services but rather study on their own. By better understanding this segment of the population, more effective resources can be developed and made available to L2 learners who struggle after they have left formal education. In this study, eight adult learners who engaged in self-directed learning (SDL) were asked to track their learning activities over the course of three weeks by maintaining a language diary. This was followed by interviews to gather information about the reasons behind their choices and the strategies they employed during the activities within the context of the SDL process (Reinders, 2020). The initial results showed that few learners used strategies to enhance their L2 learning, as the resources and activities were often chosen based on reasons unrelated to language learning, such as entertainment. This suggests that they may benefit from some form of guidance to enhance their self-directed learning.

(026) Application of Gelatin Sponge as a Hemostatic Agent in Penile Prosthesis Implantation

Abstract Introduction Gelfoam® Sterile Compressed Sponge is a hemostatic that is directly applied to bleeding surfaces. This cost-effective hemostatic agent is prepared from purified porcine skin, Gelatin granules and Water for Injection. It is water insoluble, however is completely absorbed within 4–6 weeks with minimal scar formation. Gelfoam is available sterile for intra-operative use, and is applied in a multitude of surgical specialties. Objective In this work, we demonstrate for the first time the of Gelfoam to minimize the risk of bleeding in penile prosthesis implantation. Methods Eight cases received a three-piece inflatable implant (Rigicon Infla10®) through a peno-scrotal incision. Following cylinder insertion, corporotomies were closed by tying the stay sutures rather than water-tight sewing. Gelfoam was soaked in antibiotic-supplemented saline. Air bubbles were squeezed out followed by soaking. Gelfoam was then applied to the corporotomies, pump space and entry rout to the reservoir space. It was secured over the corporotomies by closing a pre-fashioned layer of Buck’s fascia. A suction drain was inserted. Mummy wrap was not used. Drain output was monitored and complications recorded. Results In two cases, drain output was an average of 80 cc’s in the first 24 hours, then 20 cc’s in the following 24 hours. However, in 6 cases, drain output was an average of 18 cc’s in the first 24 hours, mostly sero-sanguinous, then none in the following 24 hours. No cases of hematoma formation, infection, foreign body reaction, mass formation or hypersensitivity reaction were encountered. Conclusions The initial results of the current small case series demonstrate that Gelfoam is well-tolerated in penile surgeries, with possible value at minimizing post-operative bleeding, encouraging a multi-center larger study. Disclosure No.

Clinical impact of diagnostic image-guided injections for musculoskeletal pain work-up in adolescent and adult patients at a children's hospital: initial results.

To assess the clinical impact of diagnostic musculoskeletal (MSK) injections on treatment decision-making in adolescent and adult patients at a children's hospital. Retrospective study in patients who underwent diagnostic MSK injections by fluoroscopy or ultrasound (US) between 8/2020 and 3/2023 at a children's hospital. Patients received ropivacaine and triamcinolone acetonide at pain site, reporting quantitative FACES pain score prior to, immediately following, and 2-3days following injection. Impact on patient care was subsequently assessed. A total of 109 diagnostic fluoroscopic or US MSK injection referrals (mean: 17.6years old) were included, most commonly hip (76.2%), ankle (9.2%), and iliopsoas tendon sheath (8.3%). Pain improvement occurred in 89.0% immediately and 67.9% 2-3days after MSK injection, with net 84.4% exhibiting improvement based on pain scores and clinical exams. When there was pain improvement at the site of injection, there was a statistically higher incidence of operative intervention or additional therapeutic injections compared with the cohort that did not have symptom improvement (88% versus 35.3%, P < 0.0001). For the 15.6% (N = 17) of referrals that did not have pain improvement, 17.6% (n = 3) ultimately had an operative intervention at a separate site from the diagnostic injection, as an alternative etiology for the pain was found. Image-guided MSK injections play an important role in the management of musculoskeletal disorders. 84.4% of referrals experienced symptom relief, improving confidence for treatment decision-making. Importantly, 15.6% of patients were found to have an alternative etiology for symptoms, altering management altogether.

Feasibility and early cosmetic outcome of modified lateral intercostal artery perforator flap after breast conservative surgery

BackgroundThe lateral intercostal artery perforator (LICAP) flap aims at replacing the excised breast lump with axillary tissue rich blood supply. The purpose of this study is to report the initial results of a modification LICAP flap technique in terms of intraoperative technical feasibility and short-term cosmetic outcomes in the early postoperative period.MethodsModified LICAP flap technique was performed on 36 female patients with pathologically proven BC located in the outer half of the breast in the period from June 1, 2021, to April 30, 2022.ResultsThe LICAP flap modification enabled performing the procedure with the patient in supine position without repositioning. The majority of the patients (90%) had satisfactory early cosmetic results as reported by the patients and oncoplastic independent surgeon.ConclusionModified LICAP flap reconstruction is feasible to be performed with the patient in supine position without repositioning and it has satisfactory early cosmetic outcomes.

Initial Experience Using Laparoscopic HIPEC for Gastric Cancer with Peritoneal Metastasis: Safety and Outcomes.

Peritoneal metastases (PM) develop in approximately 20% of patients with gastric cancer (GC). For selected patients, treatment of PM with cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) has shown promising results. This report aims to describe the safety and perioperative outcomes of laparoscopic HIPEC for GC/PM. This retrospective cohort study evaluated patients who had GC and PM treated with laparoscopic HIPEC (2018-2022). The HIPEC involved cisplatin and mitomycin C (MMC) or MMC alone. The primary end point was perioperative safety. The 22 patients in this study underwent 27 procedures. The mean age was 58 ± 13 years. All the patients were Eastern Cooperative Oncology Group (ECOG) 0 or 1 (55 and 45%, respectively). Five patients underwent a second laparoscopic HIPEC, with a median of 126 days (interquartile range [IQR], 117-166 days) between procedures. The median peritoneal carcinomatosis index (PCI) was 4 (IQR, 2-9), and the median hospital stay was 2 days (IQR, 1-3 days). No 30-day readmissions or complications occurred. Eight patients (36%) underwent gastrectomy (CRS ± HIPEC). After an average follow-up period of 11 months, 7 (32%) of the 22 patients were alive. The median overall survival was 11 months (IQR, 195-739 days) from the initial procedure and 19.3 months (IQR, 431-1204 days) from the diagnosis. Laparoscopic HIPEC appears to be safe with minimal perioperative complications. Approximately one third of the patients undergoing initial laparoscopic HIPEC ultimately proceeded to cytoreduction and gastrectomy. Preliminary survival data from this highly selected cohort suggest that the addition of laparoscopic HIPEC to systemic chemotherapy does not compromise other treatment options. These initial results suggest that laparoscopic HIPEC may offer benefit to patients with GC and PM and aid in the selection of patients who may benefit from curative-intent resection.

Veterinary oncologists and pet owners differ in their perceptions of chemotherapy-related adverse events in cancer-bearing dogs.

Chemotherapy is widely used in veterinary oncology but carries real and perceived risks of adverse events (AEs). Human cancer patients perceive AEs from chemotherapy as more severe than do their attending physicians. It is currently unknown whether this discrepancy exists in veterinary oncology. This survey study's aim was to assess differences in the ways that pet owners and veterinary oncologists perceive chemotherapy-related AEs. We hypothesized that veterinary oncologists would accept higher grade AEs and tolerate a greater risk of AEs of any grade than pet owners. 152 pet owners and 111 veterinary oncologists. Separate surveys were derived for pet owners and veterinary oncologists. Respondents were asked to define maximally acceptable AE scores and risks of AEs given 3 hypothetical outcomes of treatment: (1) cure, (2) extension of life, and (3) improved quality of life. Statistical tests were used to compare responses between groups. Veterinary oncologists accepted higher grade AEs if the hypothetical goal of chemotherapy was cancer cure (P = .003) or extension of life (P = .026), but owners accepted higher grade AEs if the goal of chemotherapy was to improve quality of life (P = .002). Owners accepted greater risk of moderate (P < .0001) or serious (P < .0001) AEs across the 3 treatment outcomes. This was the first study to assess how pet owners and veterinary oncologists differ in their perception of chemotherapy-related AEs. These initial results may help to frame discussions with pet owners on the expectations of chemotherapy.

Perseverance MEDA Atmospheric Pressure Observations—Initial Results

AbstractThe Mars2020 Perseverance Rover landed successfully on the Martian surface on the Jezero Crater floor (18.44°N, 77.45°E) at Martian solar longitude, Ls, ∼5° in February 2021. Since then, it has produced highly valuable environmental measurements with a versatile scientific payload including the MEDA (Mars Environmental Dynamics Analyzer) suite of environmental sensors. One of the MEDA systems is the PS pressure sensor system, which weighs 40 g and has an estimated absolute accuracy of better than 3.5 Pa and a resolution of 0.13 Pa. We present initial results from the first 414 sols of Martian atmospheric surface pressure observations by the PS, whose performance was found to meet its specifications. Observed sol‐averaged atmospheric pressures follow an anticipated pattern of pressure variation in the course of the advancing season and are consistent with data from other landing missions. The observed daily pressure amplitude varies by ∼2%–5 % of the sol‐averaged pressure, with absolute amplitude 10–35 Pa in an approximately direct relationship with airborne dust. During a regional dust storm, which began at Ls ∼ 135°, the daily pressure amplitude roughly doubled. The daily pressure variations were found to be remarkably sensitive to the seasonal evolution of the atmosphere. In particular, analysis of the daily pressure signature revealed diagnostic information likely related to the regional scale structure of the atmosphere. Comparison of Perseverance pressure observations with data from other landers reveals the global scale seasonal behavior of Mars' atmosphere.

Innovative systems for the detection of air particles in the quarries of the Western Rif, Morocco

&lt;p&gt;In a world where climate change looms large the spotlight often shines on greenhouse gases, but the shadow of man-made aerosols should not be underestimated. These tiny particles play a pivotal role in disrupting Earth's radiative equilibrium, yet many mysteries surround their influence on various physical aspects of our planet. The root of these mysteries lies in the limited data we have on aerosol sources, formation processes, conversion dynamics, and collection methods. Aerosols, composed of particulate matter (PM), sulfates, and nitrates, hold significant sway across the hemisphere. Accurate measurement demands the refinement of in-situ, satellite, and ground-based techniques. As aerosols interact intricately with the environment, their full impact remains an enigma. Enter a groundbreaking study in Morocco that dared to compare an internet of thing (IoT) system with satellite-based atmospheric models, with a focus on fine particles below 10 and 2.5 micrometers in diameter. The initial results, particularly in regions abundant with extraction pits, shed light on the IoT system's potential to decode aerosols' role in the grand narrative of climate change. These findings inspire hope as we confront the formidable global challenge of climate change.&lt;/p&gt;

A Novel Iterative Positioning Method Based on Difference RSS Model With 5G Field Experiments

In the 5th Generation (5G) positioning, the accurate values of environmental parameters such as Pathloss exponent (PLE) and transmit power are difficult to obtain accurately. Methods based on the difference of received signal strength (DRSS) can be utilized to solve the problems. An estimation method to obtain the distance ratio is given, and a distance ratio positioning model is proposed. The initial positioning results are calculated with linear least squares (LLS) algorithm. A Levenberg-Marquardt (LM) based maximum a posteriori (MAP) algorithm is proposed to obtain the final result by performing a series of iterations. We have completed the 5G field data collection in urban environments and preprocessed the raw data in 5G field experiments. We also propose a judgment method for 5G positioning based on horizontal dilution of precision (HDOP). Compared to the state-of-art DRSS-based algorithms, the proposed method has the best positioning accuracy and achieves a positioning error of 43.8 meters for 80% of samples with six base stations.