It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://blog-713624756371.gifthub.news/post/6413029857

  1. <!doctype html>
  2. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" prefix="og: http://ogp.me/ns#">
  3.  
  4.  <head>
  5.    <meta charset="utf-8">
  6.    <meta name="applicable-device" content="pc,mobile">
  7.    <meta name="viewport" content="width=device-width, initial-scale=1">
  8.    <title>Real-Time Semantic Mapping for Immersive AR Gameplay #143700196031 (2025-02-05)</title>
  9.    <link rel="canonical" href="https://blog-713624756371.gifthub.news/post/6413029857">
  10.    <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap">
  11.    <link rel="stylesheet" href="https://x.gifthub.news/static/css/style.css">
  12.    <script src="https://x.gifthub.news/static/js/lazysizes.min.js" async></script>
  13.    <link rel="shortcut icon" href="/favicon.ico">
  14.    <!-- Open Graph Metadata -->
  15.    <meta property="og:type" content="article" />
  16.    <meta property="og:title" content="Real-Time Semantic Mapping for Immersive AR Gameplay" />
  17.    <meta property="og:description" content="Real-Time Semantic Mapping for Immersive AR Gameplay #143700196031 (2025-02-05)" />
  18.    <meta property="og:url" content="https://blog-713624756371.gifthub.news/post/6413029857" />
  19.    <meta property="og:site_name" content="gifthub.news" />
  20.    <meta property="og:image" content="https://x.gifthub.news/static/images/post/8.jpg" />
  21.    <meta property="og:article:published_time" content="2025-02-05T12:53:30Z" />
  22.    <meta property="og:article:author" content="Dr. Daniel Hall" />
  23.    <meta property="og:article:section" content="gifthub.news" />
  24.    <meta property="og:article:tag" content="Games, Mobile Games, Video Games" />
  25.    <!-- Schema.org -->
  26.    <script type="application/ld+json">{
  27.            "@context": "https://schema.org",
  28.            "@type": "ScholarlyArticle",
  29.            "headline": "Real-Time Semantic Mapping for Immersive AR Gameplay #143700196031 (2025-02-05)",
  30.            "author": {
  31.                "@type": "Person",
  32.                "name": "Dr. Daniel Hall",
  33.                "affiliation": {
  34.                    "@type": "Organization",
  35.                    "name": "gifthub.news"
  36.                },
  37.                "url": "https://blog-713624756371.gifthub.news/post/6413029857"
  38.            },
  39.            "datePublished": "2025-02-05T12:53:30Z",
  40.            "image": "https://x.gifthub.news/static/images/post/8.jpg",
  41.            "journal": {
  42.                "@type": "Periodical",
  43.                "name": "gifthub.news",
  44.                "issn": "10.1069/143700196031"
  45.            },
  46.            "publisher": {
  47.                "@type": "Organization",
  48.                "name": "gifthub.news",
  49.                "url": "https://blog-713624756371.gifthub.news"
  50.            },
  51.            "doi": "143700196031",
  52.            "abstract": "Real-Time Semantic Mapping for Immersive AR Gameplay #143700196031 (2025-02-05)",
  53.            "citation": {
  54.                "@type": "CreativeWork",
  55.                "name": "Real-Time Semantic Mapping for Immersive AR Gameplay",
  56.                "author": "Dr. Daniel Hall",
  57.                "datePublished": "2025-02-05T12:53:30Z",
  58.                "url": "https://blog-713624756371.gifthub.news/post/6413029857"
  59.            }
  60.        }
  61.    </script>
  62. </head>
  63.  
  64. <body>
  65.    <div class="site-mobile-menu site-navbar-target">
  66.        <div class="site-mobile-menu-header">
  67.            <div class="site-mobile-menu-close">
  68.                <span class="icofont-close js-menu-toggle"></span>
  69.            </div>
  70.        </div>
  71.        <div class="site-mobile-menu-body"></div>
  72.    </div>
  73.    <nav class="site-nav">
  74.        <div class="container">
  75.            <div class="site-navigation">
  76.                <div class="row">
  77.                    <div class="col-md-6 text-center order-1 order-md-2 mb-3 mb-md-0">
  78.                        <a href="https://blog-713624756371.gifthub.news" class="logo m-0 text-uppercase">gifthub.news</a>
  79.                    </div>
  80.                    <div class="col-md-3 order-3 order-md-1">
  81.                    </div>
  82.                </div>
  83.            </div>
  84.        </div>
  85.    </nav>
  86.    <div class="section post-section pt-5">
  87.        <div class="container">
  88.            <div class="row justify-content-center">
  89.                <div class="col-lg-8">
  90.                    <div class="text-center">
  91.                        <img src="https://x.gifthub.news/static/images/user/6.jpg" alt="Real-Time Semantic Mapping for Immersive AR Gameplay" title="Real-Time Semantic Mapping for Immersive AR Gameplay" class="author-pic img-fluid rounded-circle mx-auto">
  92.                    </div>
  93.                    <span class="d-block text-center">Daniel Hall</span>
  94.                    <span class="date d-block text-center small text-uppercase text-black-50 mb-5">2025-02-05</span>
  95.                    <h2 class="heading text-center">Real-Time Semantic Mapping for Immersive AR Gameplay</h2>
  96.                    <p class="lead mb-4 text-center">Thanks to Daniel Hall for contributing the article "Real-Time Semantic Mapping for Immersive AR Gameplay".
  97.                    </p>
  98.                    <img src="https://x.gifthub.news/static/images/post/8.jpg" alt="Real-Time Semantic Mapping for Immersive AR Gameplay" title="Real-Time Semantic Mapping for Immersive AR Gameplay" class="img-fluid rounded mb-4 lazyload">
  99.                    <p>Game streaming platforms like Twitch, YouTube Gaming, and Mixer have revolutionized how gamers consume and interact with gaming content, turning everyday players into content creators, influencers, and entertainers. Livestreamed gameplay, interactive chats, and community engagement redefine the gaming experience, transforming passive consumption into dynamic, participatory entertainment.</p>
  100. <p>This paper systematically reviews the growing body of literature on the use of mobile games as interventions in mental health treatment, particularly focusing on anxiety, depression, and cognitive disorders. The study examines various approaches to game-based therapy, including cognitive behavioral therapy (CBT) and mindfulness-based games, assessing their effectiveness in improving emotional well-being and mental resilience. The paper proposes a conceptual framework that integrates psychological theories with game design principles to develop therapeutic mobile games. Furthermore, the study explores the ethical implications of using mobile games for mental health interventions, such as user privacy, data security, and informed consent.</p>
  101. <p>This study investigates the economic systems within mobile games, focusing on the development of virtual economies, marketplaces, and the integration of real-world currencies in digital spaces. The research explores how mobile games have created virtual goods markets, where players can buy, sell, and trade in-game assets for real money. By applying economic theories related to virtual currencies, supply and demand, and market regulation, the paper analyzes the implications of these digital economies for the gaming industry and broader digital commerce. The study also addresses the ethical considerations of monetization models, such as microtransactions, loot boxes, and the implications for player welfare.</p>
  102. <p>This study applies social network analysis (SNA) to investigate the role of social influence and network dynamics in mobile gaming communities. It examines how social relationships, information flow, and peer-to-peer interactions within these communities shape player behavior, preferences, and engagement patterns. The research builds upon social learning theory and network theory to model the spread of gaming behaviors, including game adoption, in-game purchases, and the sharing of strategies and achievements. The study also explores how mobile games leverage social influence mechanisms, such as multiplayer collaboration and social rewards, to enhance player retention and lifetime value.</p>
  103. <p>Multiplayer platforms foster communities of gamers, forging friendships across continents and creating bonds that transcend virtual boundaries. Through cooperative missions, competitive matches, and shared adventures, players connect on a deeper level, building camaraderie and teamwork skills that extend beyond the digital realm. The social aspect of gaming not only enhances gameplay but also enriches lives, fostering friendships that endure and memories that last a lifetime.</p>
  104.  
  105.                    <p>
  106.                    <a href="/redirect/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">Link</a>
  107.                    </p>
  108.                    <p><a href="https://www.linegames.org/" target="_blank" class="custom-link">External link</a>
  109. <a href="https://www.iliiili.com/" target="_blank" class="custom-link">External link</a>
  110. <a href="https://www.digwow.net/" target="_blank" class="custom-link">External link</a>
  111. <a href="https://www.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  112. <a href="https://www.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  113. <a href="https://371817556833-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  114. <a href="https://886403894382-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  115. <a href="https://589689627818-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  116. <a href="https://663257636376-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  117. <a href="https://765294542401-gov.iliiili.com/" target="_blank" class="custom-link">External link</a>
  118. <a href="https://474156022457-gov.digwow.net/" target="_blank" class="custom-link">External link</a>
  119. <a href="https://211859425044-gov.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  120. <a href="https://599840987493-gov.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  121. <a href="https://005340162247-gov-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  122. <a href="https://190695145129-gov-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  123. <a href="https://128877178702-gov-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  124. <a href="https://828042861831-gov-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  125. <a href="https://446959961759-edu.iliiili.com/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  126. <a href="https://577357530344-edu.digwow.net/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  127. <a href="https://620714959554-edu.free-giftcodes.com/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  128. <a href="https://441617575200-edu.gifthub.com.ru/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  129. <a href="https://053097550632-gov.iliiili.com/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  130. <a href="https://028983438690-gov.digwow.net/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  131. <a href="https://357877983292-gov.free-giftcodes.com/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  132. <a href="https://048102315103-gov.gifthub.com.ru/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  133. <a href="https://link.naver.com/bridge?556316451149&amp;url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  134. <a href="https://link.naver.com/bridge?938257561472&amp;url=https://naver938257561472-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  135. <a href="https://link.naver.com/bridge?604225570211&amp;url=https://naver604225570211-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  136. <a href="https://link.naver.com/bridge?857061064890&amp;url=https://naver857061064890-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  137. <a href="https://link.naver.com/bridge?546793054476&amp;url=https://naver546793054476-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  138. <a href="https://link.naver.com/bridge?934965151858&amp;url=https://naver934965151858-gov.digwow.net" target="_blank" class="custom-link">External link</a>
  139. <a href="https://link.naver.com/bridge?954333398067&amp;url=https://naver954333398067-gov.iliiili.com" target="_blank" class="custom-link">External link</a>
  140. <a href="https://link.naver.com/bridge?363801595991&amp;url=https://naver363801595991-gov.1717173.xyz" target="_blank" class="custom-link">External link</a>
  141. <a href="https://link.naver.com/bridge?507683479913&amp;url=https://naver507683479913-gov.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  142. <a href="https://link.naver.com/bridge?252158995276&amp;url=https://naver252158995276-gov-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  143. <a href="https://link.naver.com/bridge?435925185954&amp;url=https://naver435925185954-gov-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  144. <a href="https://link.naver.com/bridge?292193428733&amp;url=https://naver292193428733-gov-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  145. <a href="https://link.naver.com/bridge?623150893496&amp;url=https://naver623150893496-gov-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  146. <a href="https://blog-914409939159.gifthub.news/" target="_blank" class="custom-link">External link</a>
  147. <a href="https://blog-401374747062.jp-edu.sbs/" target="_blank" class="custom-link">External link</a>
  148. <a href="https://blog-142482173624.kr-edu.sbs/" target="_blank" class="custom-link">External link</a>
  149. <a href="https://blog-617623573610.krlinkedin.sbs/" target="_blank" class="custom-link">External link</a>
  150. <a href="https://blog-084780094242.mit-edu.sbs/" target="_blank" class="custom-link">External link</a>
  151. <a href="https://blog-460822294056.mit-edu.buzz/" target="_blank" class="custom-link">External link</a>
  152. <a href="https://blog-304665773252.mit-edu.tech/" target="_blank" class="custom-link">External link</a>
  153. <a href="https://blog-352877113196.mit-edu.site/" target="_blank" class="custom-link">External link</a>
  154. <a href="https://blog-425830560937.mit-edu.top/" target="_blank" class="custom-link">External link</a>
  155. <a href="https://blog-514949174452.usa-gov.top/" target="_blank" class="custom-link">External link</a>
  156. <a href="https://research-164584226709.mit-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  157. <a href="https://research-856840602196.harvard-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  158. <a href="https://research-003559875224.stanford-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  159. <a href="https://research-746326302097.cambridge-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  160. <a href="https://research-157366977232.berkeley-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  161. <a href="https://research-129742117850.oxford-edu.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  162. <a href="https://research-590799505242-edu.wwv.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  163. <a href="https://research-830663885860-edu.sean.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  164. <a href="https://research-182968917097-edu.line.pp.ua/?url=https://blog-713624756371.gifthub.news/post/6413029857" target="_blank" class="custom-link">External link</a>
  165. </p>
  166.                    <div class="row mt-5 pt-5 border-top">
  167.                    </div>
  168.                </div>
  169.            </div>
  170.        </div>
  171.    </div>
  172.    <div class="section pb-0">
  173.        <div class="container">
  174.            <div class="row">
  175.                <div class="col-lg-12">
  176.                    <h2 class="heading">Related</h2>
  177.                </div>
  178.            </div>
  179.            <div class="row justify-content-center">
  180.                <div class="col-lg-12">
  181.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  182.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  183.                            <a href="https://blog-713624756371.gifthub.news/post/4586293071">
  184.                            <img src="https://x.gifthub.news/static/images/post/8.jpg" alt="Exploring Gender Dynamics in Competitive Esports Environments" title="Exploring Gender Dynamics in Competitive Esports Environments" class="img-fluid lazyload">
  185.                            </a>
  186.                        </div>
  187.                        <div class="content">
  188.                            <div class="post-meta mb-3">
  189.                                <a href="https://blog-4586293071.gifthub.news/post/4586293071/" target="_blank">
  190.                                <span class="date">2025-02-05</span>
  191.                                </a>
  192.                            </div>
  193.                            <h2 class="heading"><a href="https://blog-713624756371.gifthub.news/post/4586293071">Exploring Gender Dynamics in Competitive Esports Environments</a></h2>
  194.                            <p class="info">This study examines the ethical implications of data collection practices in mobile games, focusing on how player data is used to personalize experiences, target advertisements, and influence in-game purchases. The research investigates the risks associated with data privacy violations, surveillance, and the exploitation of vulnerable players, particularly minors and those with addictive tendencies. By drawing on ethical frameworks from information technology ethics, the paper discusses the ethical responsibilities of game developers in balancing data-driven business models with player privacy. It also proposes guidelines for designing mobile games that prioritize user consent, transparency, and data protection.</p>
  195.                            <a href="https://blog-713624756371.gifthub.news/post/4586293071" class="post-author d-flex align-items-center">
  196.                                <div class="author-pic">
  197.                                    <img src="https://x.gifthub.news/static/images/user/6.jpg" alt="Exploring Gender Dynamics in Competitive Esports Environments" title="Exploring Gender Dynamics in Competitive Esports Environments" class="lazyload">
  198.                                </div>
  199.                                <div class="text">
  200.                                    <strong>Stephen Hamilton</strong>
  201.                                    <span>2025-02-05 published post</span>
  202.                                </div>
  203.                            </a>
  204.                        </div>
  205.                    </div>
  206.                </div>
  207.                <div class="col-lg-12">
  208.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  209.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  210.                            <a href="https://blog-713624756371.gifthub.news/post/1683794502">
  211.                            <img src="https://x.gifthub.news/static/images/post/18.jpg" alt="Design and Validation of Interoperable NFT Standards in Multi-Game Networks" title="Design and Validation of Interoperable NFT Standards in Multi-Game Networks" class="img-fluid lazyload">
  212.                            </a>
  213.                        </div>
  214.                        <div class="content">
  215.                            <div class="post-meta mb-3">
  216.                                <a href="https://blog-1683794502.gifthub.news/post/1683794502/" target="_blank">
  217.                                <span class="date">2025-02-05</span>
  218.                                </a>
  219.                            </div>
  220.                            <h2 class="heading"><a href="https://blog-713624756371.gifthub.news/post/1683794502">Design and Validation of Interoperable NFT Standards in Multi-Game Networks</a></h2>
  221.                            <p class="info">The intricate game mechanics of modern titles challenge players on multiple levels. From mastering complex skill trees and managing in-game economies to coordinating with teammates in high-stakes raids, players must think critically, adapt quickly, and collaborate effectively to achieve victory. These challenges not only test cognitive abilities but also foster valuable skills such as teamwork, problem-solving, and resilience, making gaming not just an entertaining pastime but also a platform for personal growth and development.</p>
  222.                            <a href="https://blog-713624756371.gifthub.news/post/1683794502" class="post-author d-flex align-items-center">
  223.                                <div class="author-pic">
  224.                                    <img src="https://x.gifthub.news/static/images/user/15.jpg" alt="Design and Validation of Interoperable NFT Standards in Multi-Game Networks" title="Design and Validation of Interoperable NFT Standards in Multi-Game Networks" class="lazyload">
  225.                                </div>
  226.                                <div class="text">
  227.                                    <strong>Joshua Gray</strong>
  228.                                    <span>2025-02-05 published post</span>
  229.                                </div>
  230.                            </a>
  231.                        </div>
  232.                    </div>
  233.                </div>
  234.                <div class="col-lg-12">
  235.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  236.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  237.                            <a href="https://blog-713624756371.gifthub.news/post/5683794120">
  238.                            <img src="https://x.gifthub.news/static/images/post/4.jpg" alt="Mobile Game Narratives as Tools for Social Justice Education" title="Mobile Game Narratives as Tools for Social Justice Education" class="img-fluid lazyload">
  239.                            </a>
  240.                        </div>
  241.                        <div class="content">
  242.                            <div class="post-meta mb-3">
  243.                                <a href="https://blog-5683794120.gifthub.news/post/5683794120/" target="_blank">
  244.                                <span class="date">2025-02-05</span>
  245.                                </a>
  246.                            </div>
  247.                            <h2 class="heading"><a href="https://blog-713624756371.gifthub.news/post/5683794120">Mobile Game Narratives as Tools for Social Justice Education</a></h2>
  248.                            <p class="info">This research explores how storytelling elements in mobile games influence player engagement and emotional investment. It examines the psychological mechanisms that make narrative-driven games compelling, focusing on immersion, empathy, and character development. The study also assesses how mobile game developers can use narrative structures to enhance long-term player retention and satisfaction.</p>
  249.                            <a href="https://blog-713624756371.gifthub.news/post/5683794120" class="post-author d-flex align-items-center">
  250.                                <div class="author-pic">
  251.                                    <img src="https://x.gifthub.news/static/images/user/3.jpg" alt="Mobile Game Narratives as Tools for Social Justice Education" title="Mobile Game Narratives as Tools for Social Justice Education" class="lazyload">
  252.                                </div>
  253.                                <div class="text">
  254.                                    <strong>Jennifer Lopez</strong>
  255.                                    <span>2025-02-05 published post</span>
  256.                                </div>
  257.                            </a>
  258.                        </div>
  259.                    </div>
  260.                </div>
  261.            </div>
  262.        </div>
  263.    </div>
  264.    <div class="py-5 bg-light mx-md-3 sec-subscribe">
  265.        <div class="container">
  266.            <div class="row">
  267.                <div class="col-lg-12">
  268.                    <h2 class="h4 fw-bold">Subscribe to newsletter</h2>
  269.                </div>
  270.            </div>
  271.            <form class="row">
  272.                <div class="col-md-8">
  273.                    <div class="mb-3 mb-md-0">
  274.                        <input type="email" class="form-control" placeholder="Enter your email">
  275.                    </div>
  276.                </div>
  277.                <div class="col-md-4 d-grid">
  278.                    <input type="submit" class="btn btn-primary" value="Subscribe">
  279.                </div>
  280.            </form>
  281.        </div>
  282.    </div>
  283.    <div class="site-footer">
  284.        <div class="container">
  285.            <div class="row justify-content-center copyright">
  286.                <div class="col-lg-7 text-center">
  287.                    <div class="widget">
  288.                        <p>Copyright &copy;
  289.                            <script>document.write(new Date().getFullYear());</script> All rights reserved.
  290.                        </p>
  291. <p>
  292.    < Top VPS Hosting Choice ><br>
  293.    <a href="https://evolution-host.com?ref=DQgZ6P" target="_blank">
  294.        <img src="https://x.gifthub.news/static/images/evolution-host.png" alt="Evolution Host" title="Evolution Host" class="evhost lazyload">
  295.    </a>
  296. </p>
  297.                    </div>
  298.                </div>
  299.            </div>
  300.        </div>
  301.    </div>
  302. </body>
  303.  
  304. </html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda