Digital Commons Network^™

A New Model Predictive Current Controller Forac-Dc Matrix Converter In Unbalanced Grids, Wenlang Deng, Minghai Wu, Haipeng Xie, Yingjie Hu

Journal of System Simulation

Abstract: To reduce the fluctuation of active power on the grid side of AC-DC matrix converters under unbalanced input conditions and to address the issue of variable switching frequency in discrete model predictive control, this paper proposes a novel model predictive control method. This method selects effective vectors based on the phase angle of the grid current, thus avoiding the computational burden of evaluating the value function in traditional model predictive control. Additionally, a second-order extended complex Kalman filter is introduced, which achieves the computation accuracy of the secondorder term of the Taylor series expansion and enables the application of …

Path Planning Based On Improved A* And Dynamic Window Approach, Peng Ji, Xinyuan Zhang, Shuaixuan Gao, Shuorang Wei

Journal of System Simulation

Abstract: In response to the low efficiency, redundant turning points, and collision issues of the traditional A* algorithm, a smart vehicle path planning algorithm that integrates an improved A* algorithm with a dynamic window approach has been proposed. The algorithm has enhanced the search point selection method, optimized the evaluation function, selected key turning points based on the slope values between turning points, and removed redundant turning points. Between every two optimized key turning points, a dynamic window approach that balances speed and safety is used for local obstacle avoidance. Experiments show that compared to the traditional A* algorithm, this …

The Synchronous Grasping Method Of Virtual-Real Assembly Robot Based On Digital Twin, Jian Xu, Gaofeng Liu, Yijian Zhao, Zili Zheng, Huanying Yan

Journal of System Simulation

Abstract: A method based on digital twin for assembly robot virtual-real synchronization and grasping is proposed to address the issues of poor intelligent grasping accuracy and difficult data processing in assembly tasks for industrial robots. Based on the digital twin, a digital twin assembly robot virtual-real synchronization and grasping architecture is designed. The OPC UA information model is built by classifying multi-source heterogeneous data, and the OPC UA communication protocol is used as a bridge for data communication of the assembly robot, achieving virtual-real synchronization. The convolutional neural network is further trained using the virtual robot to improve the grasping …

Research On Autonomous Decision-Making In Air-Combat Based On Improved Proximal Policy Optimization, Dianwei Qian, Hongmin Qi, Zhen Liu, Zhiming Zho, Jianqiang Yi

Journal of System Simulation

Abstract: To address the problems of high information redundancy and slow convergence speed of traditional reinforcement learning in air-combat autonomous decision-making applications, a proximal policy optimization air-combat autonomous decision-making method, based on dual observation and composite reward is proposed. A dual observation space, which contains interaction information as the main information and individual feature information as a supplement, was designed to reduce the influence of redundant battlefield information on the training efficiency of the decision model. A composite reward function combining result reward and process reward was designed to improve convergence speed. The generalized advantage estimator was applied in the …

Research On System-Of-Systems Confrontation Simulation Method Based On Operation Loops, Shan Zhong, Yesheng Zhu, Menglu Zhou

Journal of System Simulation

Abstract: In the field of modeling and analyzing capabilities for operation system-of-systems (SoS), traditional structured capability assessment models lack the analysis of the interaction between both rivals and armies in different roles. The system model based on operation loop theory can be combined with the relationship between sensor, decision-making, influence, and target nodes for system capability calculation, but the existing model is usually only suitable for static analysis and cannot be used for dynamic simulation of SoS confrontation. In order to solve the problems above, a SoS confrontation simulation method based on operation loops is proposed. It abstracts both rivals’ …

An Intelligent Adversaries Behavior Simulation Technology Based On Improved Behavior Trees, Fang Zhou, Bo Fan, Xiaoyi Liu, Yishan Ding, Ningxin Zhang, Yachao Shao, Xiaoyu Zhai

Journal of System Simulation

Abstract: Intelligent algorithm/intelligent platform/intelligent system intelligence capability testing and evaluation need to solve high-level intelligent opponent simulation problems, an intelligent opponent behavior simulation technology based on improved behavior tree is proposed. Four types of behavior tress nodes are designed, including behavior control, combat tasks, behavior actions, and execution condition node. Five atomic behavior actions and parameters are established, including maneuver, reconnaissance and early warning, command and decision-making, firepower strike, and electronic interference node. Five atomic condition nodes are provided, including target selection, weapon launch, and incoming weapon judgment node. The intelligent adversarial behavior simulation system is designed, including a behavior …

Study On Invulnerability Of Urban Rail Network Considering Sum Of The Neighbors Degree, Shuqing Li, Yixiao Song, Guojian Zhong

Journal of System Simulation

Abstract: In order to solve the problem of network cascade paralysis caused by urban rail station or line failure, considering the influence of the first-order neighborhood of network nodes, the load distribution impedance coefficient is proposed based on the nonlinear capacity load model, and a nonlinear capacity load optimization model considering the sum of the neighbors degree is constructed. By optimizing load structure, the alternative probability of nodes during load redistribution is adjusted to reduce the number of node failures in the cascading process, thereby the rail network invulnerability is improved. Taking Chongqing rail network as an example, the rail …

Multi-Step Information Aided Q-Learning Path Planning Algorithm, Yuelong Wang, Songyan Wang, Tao Chao

Journal of System Simulation

Abstract: To improve the path planning capability of mobile robots in a static environment and solve the problem of slow convergence of the traditional Q-learning algorithm in path planning, this paper proposes a multi-step information-aided Q-learning improvement algorithm. Using the multi-step information of greedy action in ε -greedy strategy and length of the historical optimal path to update the eligibility traces, which makes the effective eligibility traces work continuously in the iteration of the algorithm and solves the loop traps that may fall into with the preserved multi-step information; using the local multiflower pollination algorithm to initialize the Q-value table …

Phototaxis Is A Satiety-Dependent Behavioral Sequence In Hydra Vulgaris, Soonyoung Kim, Krishna N Badhiwala, Guillaume Duret, Jacob T Robinson

Faculty, Staff and Students Publications

Understanding how internal states such as satiety are connected to animal behavior is a fundamental question in neuroscience. Hydra vulgaris, a freshwater cnidarian with only 12 neuronal cell types, serves as a tractable model system for studying state-dependent behaviors. We found that starved hydras consistently move towards light, while fed hydras do not. By modeling this behavior as a set of three sequences of head orientation, jump distance and jump rate, we demonstrate that the satiety state only affects the rate of the animal jumping to a new position, while the orientation and jump distance are unaffected. These findings yield …

Olaf: An Assessment Of Online Learning Outcomes Among Forestry And Natural Resource Management University Students, Krista Merry, Pete Bettinger, Taeyoon Lee

Journal of Extension

Online learning has become an important advance in education in the last decade. We developed an online learning system related to land and tree measurements. University students were given pre- and post-exposure surveys for two courses offered within the online system. Surveys were designed to assess whether the knowledge level and confidence of students increased through interaction with the online system. A final assessment was conducted to understand user experiences with the online technology. Statistically significant increases in knowledge and confidence concerning land measurement concepts and tree measurement topics were evident among survey participants. Survey participants agreed that the course …

Carbon Footprint Analysis And Low-Carbon Optimization Method Simulation Study Of Power Transformer Based On Digital Twin Technology, Dongxue Li, Yan Liu, Boyao Shen, Yongteng Jing, Qiang Ma, Ran Liu

Journal of System Simulation

Abstract: Power transformers are the main energy-consuming equipment for substations. According to the goal of “carbon peak, carbon neutralization” in China, it is of great significance to accurately calculate the carbon footprint of transformers and seek low-carbon optimization methods. A method for constructing a digital twin model of power transformer magnetic characteristics is proposed. Based on the three-dimensional electromagnetic time-harmonic field finite element analysis method, a threedimensional model of SZ11-31.5MVA/66kV power transformer is established. The transformer loss map is obtained under fluctuating load condition, and the transformer digital twin model is constructed. The carbon footprint of the transformer is analyzed, …

Uav Online Track Planning Based On Dmoea-Aptc Algorithm, Erchao Li, Shenghui Zhang

Journal of System Simulation

Abstract: In order to solve the dynamic multi-objective optimization problem with time correlation, this paper introduces the concept of time correlation feature and establishes the model of UAV timecorrelation dynamic multi-objective optimization problem moedl on the basis of UAV online track planning problem, and proposes a dynamic multi-objective double-layer optimization algorithm using adaptive predictive response mechanism and time-correlation optimization mechanism (DMOEA-APTC). The intensity of environmental change was judged according to the correlation of environmental change and different response mechanisms were used to quickly adapt to environmental change. In the optimization process, the least square method was used to learn the …

Visual Robot Obstacle Avoidance Planning And Simulation Using Mapped Point Clouds, Hanlin Huo, Xiangjun Zou, Yan Chen, Xinzhao Zhou, Mingyou Chen, Chengen Li, Yaoqiang Pan, Yunchao Tang

Journal of System Simulation

Abstract: In response to the large and complex data volume and high redundancy of visual point cloud obstacle recognition in complex unstructured orchard environments, which severely impacts the real-time performance and efficiency of harvesting operations, a point cloud compression algorithm is proposed based on point cloud segmentation to enhance the efficiency of point cloud obstacle recognition and environmental adaptability. An Informed RRT* based approach is used combined with an inverse projection algorithm, mapping-based informed RRT*(M-Informed RRT*) to solve the harvesting path problem. By constructing a highly real-time and robust integrated robot system for sampling, perception, and obstacle avoidance, efficient obstacle …

An Improved Path Planning Algorithm For Mobile Robots, Haijie Sun, Hongjun San, Le Xiao, Dexin Yao, Jiupeng Chen, Xiaoyuan Yang

Journal of System Simulation

Abstract: To solve the problems of invalid sampling and non-optimal paths of the RRT, the quasi-stream avoidance algorithm is proposed. The RRT algorithm is introduced to specify the sampling interval to limit the sampling points and enhance the goal-oriented nature of sampling. The quasi-stream avoidance algorithm incorporating the A* algorithm (QSA*) is used to quickly bypass the obstacle when it is encountered. A path optimization algorithm is used to smooth the searched path. The simulation results show that compared with the RRT algorithm, the computation time of the RRT-QSA* algorithm is reduced by 96.83%~99.88%, the number of search nodes is …

An Application Of The Sustainable Transformational Leadership Dimensions On Teacher’S Performance: A Social Network Analysis, Aymen Al Qaradaghi, Razan Kerkukli, Riazuddin Ahmed

Alustath Journal for Human and Social Sciences

Teacher’s performance is one of the arguable issues in the organization. Sustainable Transformational leadership and its dimensions play a big role to change the nature of teacher’s performance in the organization. In this study, sustainable transformational leadership dimensions were discussed and examined through social network analysis SNA as a tool to analyze and understand results. Data collection were conducted and 30 respondents participated in the questionnaire. Organizations are educational sectors and they are 3 organizations and mentioned as symbols in the study. This study, shows that both sustainable occupational training SOT and sustainable social training SST as dimensions of sustainable …

Proposed Educational Objectives According To Delphi Style To Achieve Self-Censorship Among University Students, Mustafa Ali Adnan Alzaidi

Alustath Journal for Human and Social Sciences

The current research aims to reach proposed educational objectives for achieving self-monitoring among university students. To achieve this goal, the researcher used the descriptive approach in addition to using the Delphi method for future studies. The researcher prepared a questionnaire containing educational objectives related to achieving self-monitoring among university students, which was obtained. It was obtained through a reconnaissance questionnaire and previous studies, as well as the literature that dealt with the subject of the research. This questionnaire was presented in three rounds to the (20) experts who hold the rank of professor to demonstrate the suitability of these proposed …

Longitudinal Intravascular Antibody Labeling Identified Regulatory T Cell Recruitment As A Therapeutic Target In A Mouse Model Of Lung Cancer, Sean-Luc Shanahan, Nikesh Kunder, Charles Inaku, Natalie B Hagan, Grace Gibbons, Nicolas Mathey-Andrews, Gayathri Anandappa, Shawn Soares, Kristen E Pauken, Tyler Jacks, Jason M Schenkel

Faculty, Staff and Student Publications

Anticancer immunity is predicated on leukocyte migration into tumors. Once recruited, leukocytes undergo substantial reprogramming to adapt to the tumor microenvironment. A major challenge in the field is distinguishing recently recruited from resident leukocytes in tumors. In this study, we developed an intravascular Ab technique to label circulating mouse leukocytes before they migrate to tissues, providing unprecedented insight into the kinetics of recruitment. This approach unveiled the substantial role of leukocyte migration in tumor progression using a preclinical mouse model of lung adenocarcinoma. Regulatory T cells (Tregs), critical mediators of immunosuppression, were continuously and rapidly recruited into tumors throughout cancer …

Current Challenges In South Africa’S In Higher Education Sector: A Literature Review, Victor H. Mlambo, Siphesihle Mpanza

Alustath Journal for Human and Social Sciences

This paper examines the current problems in South Africa's higher education sector. It argues that even though there has been a considerable increase in the number of enrollments in South Africa's higher education institutions since 1994, this increase has led to considerable problems, which, unless addressed, will threaten the quality of South Africa's higher education output. The paper employs the human capital theory to explain why higher education is essential and why South Africa has put it at the centre of its need for inclusive development. A narrative literature review examined the current challenges in South Africa's higher education sector. …

Brown V. Board Of Education: Enduring Caste And American Betrayal, Sheryll Cashin

Georgetown Law Faculty Publications and Other Works

This article reflects on the role of residential caste in reproducing school segregation and how the Supreme Court betrays the equality principles of Brown by applying a colorblind constitutionalism that renders so-called de facto residential caste, and subsequent school segregation, acceptable.

During the seven-decade Great Migration of the 20^th century, northern cities deployed policies to create an architecture of inequality in which African Americans and white Americans did not live in the same neighborhoods. While the Fair Housing Act of 1968 rendered intentional discrimination in housing markets illegal, and the Court also ruled against forms of intentional housing discrimination, …

Innovative Use Of Google-Blogs To Overcome Socioeconomic And Technological Barriers In Pakistan: Link-List Gadgets As Digital Libraries., Zameer Hussain Baladi, Syed Razi Muhammad

Library Philosophy and Practice (e-journal)

Introduction: Access to educational and a research material has always been a challenge in a socio-economically challenged country like Pakistan, due to lack of financial resources, unavailability of electricity, and slow internet speeds. The use of Google blogs has promoted a new and innovative way, through which users can easily access knowledge content. This research sheds light on the creation and usefulness of digital libraries through the use of Google blogs and their link list gadgets.

Methods: Google is an international technology corporation that provides dozens of services, including Blogger. Blogger provides 25 modules or gadgets that offer …

القومي والديني والوطني: سجال المغالبة والمشاركة في النقابات المهنية الأردنية بين عامي 1989-2014, Abed Al-Hameed Ali Olimat, Mohammad Hamad Mostafa Alqatatsheh

Journal of the Association of Arab Universities for Research in Higher Education مجلة اتحاد الجامعات العربية للبحوث في التعليم العالي

هدفت الدراسة إلى تحليل فاعلية توظيف القيادات في النقابات الأيديولوجيا القومية والدينية والوطنية في إطار تنافسها السياسي في إطار العمل النقابي أم لتعزيز المشاركة للأعضاء في العمل النقابي، واعتمدت الدراسة المنهج الوصفي التحليلي والمنهج المؤسسي، وتبين من خلال الدراسة أن النقابات المهنية الأردنية تؤدي دوراً بارز الأهمية سواء كان ذلك في الجانب السياسي أو الاقتصادي أو الاجتماعي وعلى صعيد الجانب المهني، وعملت هذه النقابات المهنية في التركيز على تنظيم المهن ورفع كفاءتها، وعملت على المحافظة على حقوق ومصالح منتسبيها، وإن الصراع على قيادة النقابات ينحصر في الغالب بين قائمتين، الأولى باتت تعرف باسم القائمة البيضاء وهي قائمة التيار الإسلامي وأنصارهم، …

القيادة الخادمة وعلاقتها بالتماسك الجماعي لدى لاعبي الفرق الرياضية في جامعة اليرموك, Shafe' Suleiman Telfah, Oday Ahmed Al-Batayneh

Journal of the Association of Arab Universities for Research in Higher Education مجلة اتحاد الجامعات العربية للبحوث في التعليم العالي

هدفت الدراسة التعرف إلى مستوى ممارسة مدربي الفرق الرياضية الجماعية في جامعة اليرموك لأساليب القيادة الخادمة وعلاقتها بمستوى التماسك الجماعي من وجهة نظر اللاعبين تبعاً لمتغيرات (الجنس، واللعبة). استخدم الباحثان المنهج الوصفي، وتكونت عينة الدراسة من (118) لاعباً ولاعبةً يمثلون رياضات (كرة القدم، وكرة اليد، والكرة الطائرة)، تم جمع البيانات باستخدام الاستبيان لقياس مستوى ممارسة المدربين لأساليب القيادة الخادمة، اشتمل على (43) فقرة موزعة على ستة مجالات هي: (الثقة، والتواضع، والخدمة، وتمكين وتطوير اللاعبين، والتفاني، والتوجيه)، ومقياس التماسك الجماعي المعد من قبل (Carron et al, 2002; 1998)، اشتمل على (19) فقرة موزعة على أربعة مجالات هي: (تكامل المجموعة لأداء المهمة، …

الحكومة الإلكترونية وأثرها على علاقة المواطن بالدولة (المملكة العربية السعودية- دراسة ميدانية), Loay Mohammed Nather Dieri, Faisal Oudeh Alrfoua

Journal of the Association of Arab Universities for Research in Higher Education مجلة اتحاد الجامعات العربية للبحوث في التعليم العالي

هدفت الدراسة لبيان أثر تطبيقات الحكومة الإلكترونية على العلاقة بين المواطن والدولة من وجهة نظر المبحوثين في مدينة الرياض في المملكة العربية السعودية، وقياس أثر الرضا المواطنين عن تطبيقات الحكومة الإلكترونية وانعكاسه على العلاقة بين المواطن بالدولة من وجهة نظر المبحوثين في مدينة الرياض في المملكة العربية السعودية، واعتمدت الدراسة على المنهج المسمى بالوصفي التحليلي الارتباطي، وتكون مجتمع الدراسة من مراجعي الوزارات في مدينة الرياض في المملكة العربية السعودية، الذين راجعوا الوزارات في فترة إعداد الدراسة، واعتمدت على أسلوب العينة العشوائية النسبية الطبقية لغايات تمثيل مجتمع الدراسة، وبلغ حجم عينة الدراسة (460) مواطناً، بحسب جدول العينات، وبينت الدراسة أن هناك …

درجة ممارسة مديري المدارس للقيادة الرقمية وعلاقتها بالرضا الوظيفي لدى المعلمين, Zaineb Saleh Al Zareer

Journal of the Association of Arab Universities for Research in Higher Education مجلة اتحاد الجامعات العربية للبحوث في التعليم العالي

هدف المقال للكشف عن درجة ممارسة مديري المدارس للقيادة الرقمية وعلاقتها بالرضا الوظيفي لدى المعلمين، وتكوَّنت عينة الدراسة من (230) معلماً ومعلمة من مديرية تربية وتعليم بني عبيد - إربد، واتبعت الدراسة المنهج الوصفي الارتباطي، واستخدمت الدراسة استبانة القيادة الرقيمة، واستبانة الرضا الوظيفي، وتوصَّلت الدراسة إلى أن نسبة القيادة الرقمية لدى مديري المدارس من وجهة نظر المعلمين التي بلغت (71.7%) وهو مستوى "مرتفع"، وأن نسبة الرضا الوظيفي لدى المعلمين التي بلغت (69.3%) وهو مستوى "مرتفع"، وتوجد علاقة ذات دلالة إحصائية (0.491) في القيادة الرقمية واستبانة الرضا الوظيفي، وتوجد فروق ذات دلالة إحصائية بين متوسط القيادة الرقمية لدى مديري المدارس من …

Reimagining Office Hours, Sarah Tulane, Carla Endres, Jesse Jones, Melissa Scheaffer

Empowering Teaching Excellence Conference

Office hours are a valuable opportunity for instructors to connect with students, fostering a sense of community, building a relationship-rich educational experience, and providing support for student success. Yet, many instructors struggle with low attendance and limited student engagement with office hours. This workshop draws from insights found in Relationship-Rich Education by Felten and Lambert to explore innovative strategies for improving office hour interactions.Participants will be introduced to a range of effective practices used by instructors across various disciplines to encourage student participation and build stronger relationships outside the classroom. Presenters will review deliberate choices regarding office hour locations, such …

Risks, Mistakes, And Resilience: Cultivating Student Persistence Through Class Culture, Vance Reeder

Empowering Teaching Excellence Conference

In this workshop we will discuss how to help students develop resilience and cultivate persistence. This workshop will focus on creating a class culture where students are able to take risks, embrace the mistakes that come from taking risks, and seek feedback as they prepare to take future risks. In this workshop, participants will have an opportunity to participate in a hands on learning exercise that will assist them in preparing to cultivate a growth mindset within their students.

The Courage To Teach: How To Keep Showing Up In Ways That Matter, Marlene Graf, Christian Bolander, Rose Judd-Murray, Alyssa Reidhead, Lance Stott

Empowering Teaching Excellence Conference

This workshop will ask you to think about ways that you can incorporate study strategies so that students can become more active and successful. Join us as we embark on the path toward enriched learning experiences and sustained academic success.

"Dare To Know": Teaching And Mentoring In The University Honors Program, Kristine Miller, Chris Babits, Sara M. Freeman, Julia M. Gossard, Elizabeth Vargis

Empowering Teaching Excellence Conference

This panel discussion will introduce faculty to specific ways to get involved with teaching and mentoring students in the University Honors Program. Honors is not about GPA or test scores; it is a program dedicated to supporting students with a growth mindset who want to make the most of their time in college. The program offers faculty many different ways to engage with students: you can lead an Honors Book Lab discussion for an hour a week over a month, mentor students as they complete short- or longer-term research, creative, or professional-development projects, teach a course, and more. This panel …

Alpina: A Semiannual Review Of Mountaineering In The Greater Ranges

Appalachia

Among the many updates on mountaineering in the greater ranges in summer and fall 2023: Samson Zebturiah Barner is arrested near Smith Rock in central Oregon for taking several weapons to a climbing event. Three climbers open a new route on Pik Alpinist in Kyrgyzstan. A brief review of the New York Times article on the discovery of Janet Johnson’s camera on Aconcagua 50 years after she and John Cooper died there. On Everest, 3,600 climbers attempted the peak in 2023; eighteen died, 100 years after the biggest Everest mystery of all: the disappearance of Mallory and Irvine. Three Americans …

Chocorua—Tomorrua: Three Generations Of Women On Mount Chocorua, 1903–1974, Jane English

Appalachia

The author tracks three generations of strong women in her family climbing Mount Chocorua in New Hampshire’s White Mountains.