Pub Date : 2024-04-02DOI: 10.54254/2753-8818/31/20240962
Zicheng Tian
Homogeneous charge compression ignition (HCCI) technology is a novel approach in internal combustion engines that combines the efficiency of gasoline engines with the spontaneous ignition characteristics of diesel engines. HCCI engines offer cleaner emissions, reduced noise, and wider fuel adaptability, overcoming many drawbacks of traditional engines. The paper explores the HCCI combustion process, highlighting its unique features and advantages over spark ignition (SI) and compression ignition (CI) engines. It also discusses innovations in HCCI technology, including its combination with other strategies like spark-controlled compression ignition (SCCI) and low-temperature combustion (LTC) to expand its load range. The challenges of HCCI technology, especially in combustion timing control, are addressed, along with suggestions for future research directions. The application of HCCI technology for energy savings and emission reduction and its impact on the automotive industry are also discussed, citing examples from manufacturers like Volvo, Nissan, and General Motors. The paper concludes by emphasizing the importance of ongoing research, integration with other technologies, and financial support to further advance HCCI technology and its market potential.
{"title":"Advancements in homogeneous charge compression ignition technology: Efficiency, emissions, and applications in the modern automotive industry","authors":"Zicheng Tian","doi":"10.54254/2753-8818/31/20240962","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20240962","url":null,"abstract":"Homogeneous charge compression ignition (HCCI) technology is a novel approach in internal combustion engines that combines the efficiency of gasoline engines with the spontaneous ignition characteristics of diesel engines. HCCI engines offer cleaner emissions, reduced noise, and wider fuel adaptability, overcoming many drawbacks of traditional engines. The paper explores the HCCI combustion process, highlighting its unique features and advantages over spark ignition (SI) and compression ignition (CI) engines. It also discusses innovations in HCCI technology, including its combination with other strategies like spark-controlled compression ignition (SCCI) and low-temperature combustion (LTC) to expand its load range. The challenges of HCCI technology, especially in combustion timing control, are addressed, along with suggestions for future research directions. The application of HCCI technology for energy savings and emission reduction and its impact on the automotive industry are also discussed, citing examples from manufacturers like Volvo, Nissan, and General Motors. The paper concludes by emphasizing the importance of ongoing research, integration with other technologies, and financial support to further advance HCCI technology and its market potential.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"43 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140751990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.54254/2753-8818/34/20241174
Jiaxin Zhou
The purpose of this study is to investigate how the Wix platform and JavaScript collaborate to create user interfaces (UI) for educational blogs that are robust and simple to operate. The purpose of this study is to investigate the extent to which Java technologies, particularly Spring and Hibernate, might enhance user interface designs on the Wix platform. The study also focuses on the significance of striking a balance between design and technology. Through the incorporation of tools for online lesson preparation and time management, the project intends to improve the overall quality of the user experience. This is because educational applications have challenges that are unique and need to be eliminated. Using Java technologies like Spring, Hibernate, and Jakarta Faces, the research project involves the creation of an instructive blog. The research makes use of the Design Thinking methodology and takes a human-centered approach to its methodology. To facilitate user comfort, aesthetic appeal, and efficient interaction, the design makes use of visual harmony, simplicity, and refinement at various points throughout. In the context of this research, the use of wireframing, high-fidelity mockups, and prototype assembly on the Wix platform helps the growth of the internet as well as the development of instructional resources. One of the objectives of this project is to develop a design for an educational blog that is consistent and visually appealing.
{"title":"Investigating the role of Java Frameworks in enhancing web UI design with the design thinking method","authors":"Jiaxin Zhou","doi":"10.54254/2753-8818/34/20241174","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241174","url":null,"abstract":"The purpose of this study is to investigate how the Wix platform and JavaScript collaborate to create user interfaces (UI) for educational blogs that are robust and simple to operate. The purpose of this study is to investigate the extent to which Java technologies, particularly Spring and Hibernate, might enhance user interface designs on the Wix platform. The study also focuses on the significance of striking a balance between design and technology. Through the incorporation of tools for online lesson preparation and time management, the project intends to improve the overall quality of the user experience. This is because educational applications have challenges that are unique and need to be eliminated. Using Java technologies like Spring, Hibernate, and Jakarta Faces, the research project involves the creation of an instructive blog. The research makes use of the Design Thinking methodology and takes a human-centered approach to its methodology. To facilitate user comfort, aesthetic appeal, and efficient interaction, the design makes use of visual harmony, simplicity, and refinement at various points throughout. In the context of this research, the use of wireframing, high-fidelity mockups, and prototype assembly on the Wix platform helps the growth of the internet as well as the development of instructional resources. One of the objectives of this project is to develop a design for an educational blog that is consistent and visually appealing.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.54254/2753-8818/34/20241169
Maishi Huang
Due to the rapid development of the Internet, online shopping is also developing, in which the construction of online shopping platforms is becoming more and more important. However, existing shopping website page designs often lack consideration for user needs, resulting in some negative user experiences for users. This paper aims to research the design and implementation of Java for commercial shopping pages and points out that Java design pages can greatly help enterprises and users. This study achieved a user-friendly improvement of key design elements such as logos, typography, language style, colors, and icons. This design provides diverse user options and improves user satisfaction. The research in this paper can help designers better satisfy the needs of users when designing pages and bring the greatest benefits to themselves or enterprises. The results of this study provide a new path for website page design for related research, which significantly improves user experience and shopping enthusiasm.
{"title":"Design and implementation of Java-based business shopping web page","authors":"Maishi Huang","doi":"10.54254/2753-8818/34/20241169","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241169","url":null,"abstract":"Due to the rapid development of the Internet, online shopping is also developing, in which the construction of online shopping platforms is becoming more and more important. However, existing shopping website page designs often lack consideration for user needs, resulting in some negative user experiences for users. This paper aims to research the design and implementation of Java for commercial shopping pages and points out that Java design pages can greatly help enterprises and users. This study achieved a user-friendly improvement of key design elements such as logos, typography, language style, colors, and icons. This design provides diverse user options and improves user satisfaction. The research in this paper can help designers better satisfy the needs of users when designing pages and bring the greatest benefits to themselves or enterprises. The results of this study provide a new path for website page design for related research, which significantly improves user experience and shopping enthusiasm.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"39 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.54254/2753-8818/34/20241167
Hongbin Zhang
Freelancing is a type of labor arrangement in which independent freelancers use their discretionary time to perform ad hoc tasks, usually of a single nature, with the aim of getting paid. This study proposes an augmented method for predicting the amount of freelance transactions using textual sentiment analysis. First, a unique feature labeled Freelancer Sentiment was selected to summarize the positive or negative sentiment orientation of freelancers. Subsequently, Naive Bayes algorithm is applied to process the text data from the freelancers platform to finally develop a Model for Computing Word Sentiment Values. The model helps to accurately calculate the sentiment values associated with emotional words. Finally, the Word Frequency-Inverse Document Frequency (TF-IDF) algorithm is used to construct the Text Sentiment Value Calculation Model, so as to accurately calculate the sentiment values of freelancers. The results of the comparison experiments of the five commonly used prediction models show that the mean squared error (MSE) of the model that includes the freelancer sentiment feature is significantly reduced by 6%-11% compared with the model that does not include the freelancer sentiment feature. This study contains theoretical explorations and practical implications. First, the proposed approach of extracting features from textual data to build predictive models provides a valuable reference for future enhancement of predictive modeling on freelance platforms, especially those that rely on unstructured data. Second, incorporating textual sentiment value features relevant to freelancers can significantly improve the accuracy of predicting transaction amounts. Third, the calculation of word and text sentiment values employs a series of algorithms that target specific features of the freelancer platforms text data. This approach is important for improving the accuracy of feature value calculation.
{"title":"An enhancement methodology for predicting transaction amounts for freelancers on freelance platforms: Based on sentiment analysis","authors":"Hongbin Zhang","doi":"10.54254/2753-8818/34/20241167","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241167","url":null,"abstract":"Freelancing is a type of labor arrangement in which independent freelancers use their discretionary time to perform ad hoc tasks, usually of a single nature, with the aim of getting paid. This study proposes an augmented method for predicting the amount of freelance transactions using textual sentiment analysis. First, a unique feature labeled Freelancer Sentiment was selected to summarize the positive or negative sentiment orientation of freelancers. Subsequently, Naive Bayes algorithm is applied to process the text data from the freelancers platform to finally develop a Model for Computing Word Sentiment Values. The model helps to accurately calculate the sentiment values associated with emotional words. Finally, the Word Frequency-Inverse Document Frequency (TF-IDF) algorithm is used to construct the Text Sentiment Value Calculation Model, so as to accurately calculate the sentiment values of freelancers. The results of the comparison experiments of the five commonly used prediction models show that the mean squared error (MSE) of the model that includes the freelancer sentiment feature is significantly reduced by 6%-11% compared with the model that does not include the freelancer sentiment feature. This study contains theoretical explorations and practical implications. First, the proposed approach of extracting features from textual data to build predictive models provides a valuable reference for future enhancement of predictive modeling on freelance platforms, especially those that rely on unstructured data. Second, incorporating textual sentiment value features relevant to freelancers can significantly improve the accuracy of predicting transaction amounts. Third, the calculation of word and text sentiment values employs a series of algorithms that target specific features of the freelancer platforms text data. This approach is important for improving the accuracy of feature value calculation.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"86 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.54254/2753-8818/34/20241125
Suni Yao
The study of sediment movement in a stably stratified (each layer is less dense than the one below it) fluid is important for applications such as airborne virus transport, contaminant transport, and sediment settling in river inlets. This project will quantify the effect of sediment-driven instability on the horizontal motion of sediment in a stably stratified fluid. Experiments are designed to analyze this process by adding sediment-rich brine-free water to sediment-free brine, where salinity differences are used to construct stably stratified fluids. The experiments are done with salinity same as salty water with concentration of sediments derived from linear stability analysis. This work provide baseline experiments for sediment settling in a stably stratified fluids for numerical validations in the future.
{"title":"River water injecting into sea: Movement of sediments in stable stratified flows","authors":"Suni Yao","doi":"10.54254/2753-8818/34/20241125","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241125","url":null,"abstract":"The study of sediment movement in a stably stratified (each layer is less dense than the one below it) fluid is important for applications such as airborne virus transport, contaminant transport, and sediment settling in river inlets. This project will quantify the effect of sediment-driven instability on the horizontal motion of sediment in a stably stratified fluid. Experiments are designed to analyze this process by adding sediment-rich brine-free water to sediment-free brine, where salinity differences are used to construct stably stratified fluids. The experiments are done with salinity same as salty water with concentration of sediments derived from linear stability analysis. This work provide baseline experiments for sediment settling in a stably stratified fluids for numerical validations in the future.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"521 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140750740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.54254/2753-8818/34/20241190
Qingyang Shu
In the actual financial market, the classical Black-Scholes (B-S) model cant perfectly describe the process of stock price. Besides, memory effect is an important phenomenon in financial systems. Thus, in this paper, we establish a fractional order stochastic differential equations (FSDE) which is driven by fractional Brownian motion (fBm) to describe the effect of noise memory and trend memory in financial pricing. Finally, we derive a European option pricing formula based on the established model. After conducting an empirical analysis based on the SSE 50ETF, we find that the established model performs better than the traditional one.
{"title":"European Option Pricing Based on FSDE Driven by Fractional Brownian Motion","authors":"Qingyang Shu","doi":"10.54254/2753-8818/34/20241190","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241190","url":null,"abstract":"In the actual financial market, the classical Black-Scholes (B-S) model cant perfectly describe the process of stock price. Besides, memory effect is an important phenomenon in financial systems. Thus, in this paper, we establish a fractional order stochastic differential equations (FSDE) which is driven by fractional Brownian motion (fBm) to describe the effect of noise memory and trend memory in financial pricing. Finally, we derive a European option pricing formula based on the established model. After conducting an empirical analysis based on the SSE 50ETF, we find that the established model performs better than the traditional one.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"106 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-15DOI: 10.54254/2753-8818/30/20240739
Jinxi Li
This paper undertakes a historical investigation of the separate and independent development of calculus by Isaac Newton and Gottfried Leibniz in the late 17th century. Through analysis of primary sources and historiographical perspectives, it explores the differences in notation, methods, and applications used by each mathematician to formulate foundational concepts of calculus. The research demonstrates that Newton relied more on geometric intuition, developing calculus concepts like fluxions and fluents rooted in kinematic problems. His 1687 Philosophiae Naturalis Principia Mathematica synthesized many calculus innovations. Meanwhile, Leibniz approached calculus from an algebraic mindset, utilizing infinitesimal differentials and comprehensively explaining integral and differential calculus in publications like Nova Methodus pro Maximis et Minimis. Evaluation of letters and documents from the 1670s and 1680s shows no direct collaboration or communication about calculus between Newton and Leibniz. This lack of transmission, coupled with the disparities in their notation and calculus techniques, provides evidence for independent creation. However, Newton and Leibniz shared key insights regarding rates of change, derivatives and integrals, hinting at a broader zeitgeist in early modern mathematics and science. Thus, this dual achievement illustrates how the Scientific Revolution facilitated conceptual convergence despite geographic separation between great thinkers. Investigating this case study offers perspective on the interplay between individual genius and wider social contexts in driving scientific progress. This paper concludes by assessing the legacy of the Newton-Leibniz debate over priority and analyzing work that paved the way for modern unified calculus notation and applications.
本文对艾萨克-牛顿（Isaac Newton）和戈特弗里德-莱布尼兹（Gottfried Leibniz）在 17 世纪末分别独立发展微积分的历史进行了研究。通过对原始资料和史学视角的分析，本文探讨了两位数学家在提出微积分基本概念时在符号、方法和应用方面的差异。研究表明，牛顿更依赖几何直觉，从运动学问题出发，提出了通量和流体等微积分概念。他在 1687 年出版的《自然哲学原理》（Philosophiae Naturalis Principia Mathematica）中综合了许多微积分创新。与此同时，莱布尼茨从代数的角度来研究微积分，利用无穷小微分，并在《Nova Methodus pro Maximis et Minimis》等著作中全面解释了积分和微分。对 1670 年代和 1680 年代的信件和文件的评估显示，牛顿和莱布尼兹之间没有关于微积分的直接合作或交流。这种缺乏交流的情况，再加上他们在符号和微积分技术上的差异，为他们的独立创作提供了证据。然而，牛顿和莱布尼兹分享了关于变化率、导数和积分的关键见解，暗示了早期现代数学和科学中更广泛的时代精神。因此，这一双重成就说明了科学革命是如何在伟大思想家之间存在地理分隔的情况下促进概念趋同的。通过对这一案例的研究，我们可以透视在推动科学进步的过程中，个人天才与更广泛的社会背景之间的相互作用。本文最后评估了牛顿-莱布尼兹关于优先权争论的遗产，并分析了为现代统一微积分符号和应用铺平道路的工作。
{"title":"A historical analysis of the independent development of calculus by Newton and Leibniz","authors":"Jinxi Li","doi":"10.54254/2753-8818/30/20240739","DOIUrl":"https://doi.org/10.54254/2753-8818/30/20240739","url":null,"abstract":"This paper undertakes a historical investigation of the separate and independent development of calculus by Isaac Newton and Gottfried Leibniz in the late 17th century. Through analysis of primary sources and historiographical perspectives, it explores the differences in notation, methods, and applications used by each mathematician to formulate foundational concepts of calculus. The research demonstrates that Newton relied more on geometric intuition, developing calculus concepts like fluxions and fluents rooted in kinematic problems. His 1687 Philosophiae Naturalis Principia Mathematica synthesized many calculus innovations. Meanwhile, Leibniz approached calculus from an algebraic mindset, utilizing infinitesimal differentials and comprehensively explaining integral and differential calculus in publications like Nova Methodus pro Maximis et Minimis. Evaluation of letters and documents from the 1670s and 1680s shows no direct collaboration or communication about calculus between Newton and Leibniz. This lack of transmission, coupled with the disparities in their notation and calculus techniques, provides evidence for independent creation. However, Newton and Leibniz shared key insights regarding rates of change, derivatives and integrals, hinting at a broader zeitgeist in early modern mathematics and science. Thus, this dual achievement illustrates how the Scientific Revolution facilitated conceptual convergence despite geographic separation between great thinkers. Investigating this case study offers perspective on the interplay between individual genius and wider social contexts in driving scientific progress. This paper concludes by assessing the legacy of the Newton-Leibniz debate over priority and analyzing work that paved the way for modern unified calculus notation and applications.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":" 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139621406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-15DOI: 10.54254/2753-8818/30/20240934
Chenghao Zhao
Due to the rapid development of semiconductor technology, the edges of electronic devices are getting smaller and the power consumption is getting lower and lower 3-op-amp instrumentation amplifier. However, there are still some problems such as excessive power consumption and noise. First, the disadvantages are identified, and then the shortcomings of the specialty are improved. So this design gives a low noise ECG equipment, which shows great performance in reducing noise to 3.94uV and the highest differential gain reaches 36.508376dB. It can be used in watches and other wearable devices for ECG signal detection. At the same time, this project can complete the required requirements and is suitable for some wearable devices. Its successful research could lead to more accurate ECG monitoring and consume less power in wearable devices. More importantly, its emergence brings new development ideas and development directions to ECG equipment, making ECG monitoring convenient and mobile.
{"title":"Low noise, analog electrocardiogram signal amplifier for wearable equipment","authors":"Chenghao Zhao","doi":"10.54254/2753-8818/30/20240934","DOIUrl":"https://doi.org/10.54254/2753-8818/30/20240934","url":null,"abstract":"Due to the rapid development of semiconductor technology, the edges of electronic devices are getting smaller and the power consumption is getting lower and lower 3-op-amp instrumentation amplifier. However, there are still some problems such as excessive power consumption and noise. First, the disadvantages are identified, and then the shortcomings of the specialty are improved. So this design gives a low noise ECG equipment, which shows great performance in reducing noise to 3.94uV and the highest differential gain reaches 36.508376dB. It can be used in watches and other wearable devices for ECG signal detection. At the same time, this project can complete the required requirements and is suitable for some wearable devices. Its successful research could lead to more accurate ECG monitoring and consume less power in wearable devices. More importantly, its emergence brings new development ideas and development directions to ECG equipment, making ECG monitoring convenient and mobile.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":" 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139622985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-15DOI: 10.54254/2753-8818/30/20241106
Hanxuan Wang
Given n identical-looking coins each with possible weight in {0, 1}, and a scale that can measure the weight of any arbitrary set of coins, the coin weighing problem studies how to find out the weight of every coin with as few weighing as possible. The algorithm in Lindstrm takes O(n/logn) non-adaptive weighings to determine the coins, which gives an O(logn) factor improvement compared with the nave algorithm that measures each coin on its own. However, it is unclear that with the O(n/logn) queries, how long it takes to retrieve x. This paper is about establishing and further optimizing the nave recovery time complexity of Lindstrm s algorithm. The recovery time complexity here is defined as the time complexity to recover x given Dx under the RAM model, where D{0,1}^(mn),, each row being a weighing query, is the Lindstrm query matrix. The brute force recovery algorithm has running time O(m2n), whereas our algorithm only takes O(mn). Finally, we run experiments to verify our results with the actual running time of the algorithm on various size of inputs
{"title":"The recovery time complexity of a coin weighing algorithm","authors":"Hanxuan Wang","doi":"10.54254/2753-8818/30/20241106","DOIUrl":"https://doi.org/10.54254/2753-8818/30/20241106","url":null,"abstract":"Given n identical-looking coins each with possible weight in {0, 1}, and a scale that can measure the weight of any arbitrary set of coins, the coin weighing problem studies how to find out the weight of every coin with as few weighing as possible. The algorithm in Lindstrm takes O(n/logn) non-adaptive weighings to determine the coins, which gives an O(logn) factor improvement compared with the nave algorithm that measures each coin on its own. However, it is unclear that with the O(n/logn) queries, how long it takes to retrieve x. This paper is about establishing and further optimizing the nave recovery time complexity of Lindstrm s algorithm. The recovery time complexity here is defined as the time complexity to recover x given Dx under the RAM model, where D{0,1}^(mn),, each row being a weighing query, is the Lindstrm query matrix. The brute force recovery algorithm has running time O(m2n), whereas our algorithm only takes O(mn). Finally, we run experiments to verify our results with the actual running time of the algorithm on various size of inputs","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":" 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139620578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-15DOI: 10.54254/2753-8818/30/20241090
Zehang Wang
Environmental control and life support systems (ECLSS) are essential for the triumph of human spaceflight missions, furnishing astronauts with crucial resources like breathable air, purified water, nourishment, and protection from radiation. The unique and challenging space environment, coupled with the critical nature of ECLSS components, necessitates a high degree of reliability to prevent catastrophic failures. This paper conducts a comprehensive examination of various ECLSS subsystems, including air revitalization, water processing, food storage, waste management, and radiation shielding. Gaining perspectives from historical missions like Apollo, Skylab, and the International Space Station (ISS), the research outlines strategic approaches to improve the fault tolerance of ECLSS. The implementation of advanced simulation modeling, strategic component redundancy, and improved subsystem interconnectivity are posited as pivotal measures to bolster the reliability of ECLSS. These improvements are vital to guarantee the safety and viability of prolonged space missions to the Moon, Mars, and beyond, thereby facilitating humanitys ongoing exploration of the universe.
{"title":"Improvement and optimization of spacecraft environmental control and life support systems","authors":"Zehang Wang","doi":"10.54254/2753-8818/30/20241090","DOIUrl":"https://doi.org/10.54254/2753-8818/30/20241090","url":null,"abstract":"Environmental control and life support systems (ECLSS) are essential for the triumph of human spaceflight missions, furnishing astronauts with crucial resources like breathable air, purified water, nourishment, and protection from radiation. The unique and challenging space environment, coupled with the critical nature of ECLSS components, necessitates a high degree of reliability to prevent catastrophic failures. This paper conducts a comprehensive examination of various ECLSS subsystems, including air revitalization, water processing, food storage, waste management, and radiation shielding. Gaining perspectives from historical missions like Apollo, Skylab, and the International Space Station (ISS), the research outlines strategic approaches to improve the fault tolerance of ECLSS. The implementation of advanced simulation modeling, strategic component redundancy, and improved subsystem interconnectivity are posited as pivotal measures to bolster the reliability of ECLSS. These improvements are vital to guarantee the safety and viability of prolonged space missions to the Moon, Mars, and beyond, thereby facilitating humanitys ongoing exploration of the universe.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":" 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139621037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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