scholarly journals Ultrasound-driven Curveball in Table Tennis

2021 ◽  
Vol 5 (ISS) ◽  
pp. 1-20
Author(s):  
Tao Morisaki ◽  
Ryoma Mori ◽  
Ryosuke Mori ◽  
Kohki Serizawa ◽  
Yasutoshi Makino ◽  
...  
Keyword(s):  
User Study ◽  
Research Field ◽  
Table Tennis ◽  
Tennis Players ◽  
Concept System ◽  
Remote Manipulation ◽  
System A ◽  
Ping Pong ◽  
Specific Device ◽  
Physical Abilities

Augmented Human (AH) is a research field enhancing human physical abilities or supporting human activity using advanced technologies. As one of the AH approaches, previous studies have attached an actuator to a human body or tools used for an activity. The attached actuators are used to control their movements to support an activity. In this study, instead of attaching actuators, we propose to directly apply noncontact ultrasound force to a lightweight tool to manipulate it. The advantage of using noncontact force is that users do not need to wear a specific device and to process tools used for the activity. As a proof-of-concept system, we developed an ultrasound-based curveball system by which table tennis players can shoot a curveball regardless of their physical ability. In the system, a moving ping-pong ball (PPB) is a target tool for remote manipulation. The system curves the trajectory of a moving PPB by continuously focusing ultrasound on it. Users can control the curve timing and the curve direction (left or right) using a racket-shaped controller. In the user study, we conducted an actual table tennis match using the curveball system and qualitatively confirmed that the player using the system had the upper hand. Another user study using a ball dispenser quantitatively showed that the ultrasound-driven curveball increased the number of mistakes of the opponent player 2.95 times. These results indicate that the proposed concept is feasible.

scholarly journals Czech and Polish Table Tennis Players of Jewish Origin in International Competition (1926-1957)

2011 ◽  
Vol 53 (1) ◽  
pp. 65-75
Author(s):  
Wiesław Pięta ◽  
Aleksandra Pięta
Keyword(s):  
Czech Republic ◽  
Minority Group ◽  
International Competition ◽  
Table Tennis ◽  
Tennis Players ◽  
Jewish Origin ◽  
Stage Of Development ◽  
Ping Pong ◽  
The World ◽  
World Champion

Czech and Polish Table Tennis Players of Jewish Origin in International Competition (1926-1957)The beginnings of the 18th century marked the birth of Jewish sport. The most famous athletes of those days were boxers, such as I. Bitton, S. Eklias, B. Aaron, D. Mendoga. Popular sports of this minority group included athletics, fencing and swimming. One of the first sport organizations was the gymnastic society Judische Turnverein Bar Kocha (Berlin - 1896).Ping-pong as a new game in Europe developed at the turn of the 20th century. Sport and organizational activities in England were covered by two associations: the Ping Pong Association and the Table Tennis Association; they differed, for example, in the regulations used for the game. In 1902, Czeski Sport (a Czech Sport magazine) and Kurier Warszawski (Warsaw's Courier magazine) published first information about this game. In Czech Republic, Ping-pong became popular as early as the first stage of development of this sport worldwide, in 1900-1907. This was confirmed by the Ping-pong clubs and sport competitions. In Poland, the first Ping-pong sections were established in the period 1925-1930. Czechs made their debut in the world championships in London (1926). Poles played for the first time as late as in the 8th world championships in Paris (1933). Competition for individual titles of Czech champions was started in 1927 (Prague) and in 1933 in Poland (Lviv).In the 1930s, Czechs employed an instructor of Jewish descent from Hungary, Istvan Kelen (world champion in the 1929 mixed games, studied in Prague). He contributed to the medal-winning success of Stanislaw Kolar at the world championships. Jewish players who made history in world table tennis included Trute Kleinowa (Makkabi Brno) - world champion in 1935-1937, who survived imprisonment in the Auschwitz-Birkenau Nazi concentration camp, Alojzy Ehrlich (Hasmonea Lwów), the three-time world vice-champion (1936, 1937, 1939), also survivor of Auschwitz-Birkenau, and Ivan Andreadis (Sparta Praga), nine-time world champion, who was interned during World War II (camp in Kleinstein near Krapkowice).Table tennis was a sport discipline that was successfully played by female and male players of Jewish origins. They made powerful representations of Austria, Hungary, Romania and Czech Republic and provided the foundation of organizationally strong national federations.

When Sports Challenge Authority: A Case Study of Gatekeeping During the 2017 Chinese Ping-Pong Boycott

2018 ◽  
Vol 11 (4) ◽  
pp. 529-551
Author(s):  
Qingru Xu ◽  
Andrew C. Billings
Keyword(s):  
Mainland China ◽  
Head Coach ◽  
Table Tennis ◽  
Government Control ◽  
Chinese Media ◽  
Tennis Players ◽  
Mainland Chinese ◽  
Media System ◽  
Ping Pong ◽  
Media Institutions

At the World Tour Platinum China Open in 2017, 3 leading Chinese table tennis players and two coaches withdrew from the Games to protest the sudden removal of Head Coach Liu Guoliang, triggering unprecedented public uproar online. Applying gatekeeping theory, this study explored how mainland Chinese media controlled information flow during the crisis. A thematic analysis uncovered 3 primary gatekeeping behaviors: repetition, selection, and manipulation. Findings suggest that the party-state, not media institutions, was the dominant gatekeeper in mainland China. The Chinese media system and sports system were both subject to strict government control during a crisis that challenged authority.

Growth and maturity status of young male table tennis players

2021 ◽  
pp. 1-19
Author(s):  
Manuel J. Coelho-e-Silva ◽  
Jan M. Konarski ◽  
Magdalena Krzykała ◽  
Szymon Galas ◽  
Pluta Beata ◽  
...  
Keyword(s):  
Young Male ◽  
Table Tennis ◽  
Tennis Players

Technology teaching of college table tennis players based on virtual simulation technology

2021 ◽  
pp. 002072092098608
Author(s):  
Jincheng Yu ◽  
Yonatan Asher Vexler ◽  
Rongzhi Li
Keyword(s):  
Physical Education ◽  
Teaching Method ◽  
Student Interest ◽  
Table Tennis ◽  
Tennis Players ◽  
Modern Information Technology ◽  
Multimedia Teaching ◽  
Short Period ◽  
Competition Process ◽  
The Times

Modern information technology is more and more widely used in school physical education. At the same time, the application of multimedia technology is becoming more and more extensive in education. As a teaching method, multimedia has developed into an important component of modern educational technology and science, and also provides support for teaching reform. The use of multimedia organization teaching can make up for the shortcomings of traditional physical education, promote the development of physical education, cultivate students' lifelong sports awareness and enhance physical fitness. Physical education is an important component of modern education, and its reform is also the trend of the times. According to the characteristics of the ordinary group of college table tennis, exploring the use of multimedia teaching platform can make the table tennis class more vivid and interesting, let students master some basic skills and skills of table tennis in a short period of time, understand and experience table tennis. The competition process enhances student interest and serves lifelong sports.

Control of Striking Velocity by Table Tennis Players

2004 ◽  
Vol 99 (3) ◽  
pp. 1027-1034 ◽  
Author(s):  
Welber Marinovic ◽  
Cristina Akiko Iizuka ◽  
Andrea Michele Freudenheim
Keyword(s):  
Table Tennis ◽  
Tennis Players

Vibration separation of multiple mixed particle curves based on image recognition and machine learning

2021 ◽  
pp. 1-13
Author(s):  
Zhou Yanyan
Keyword(s):  
Particle Physics ◽  
Granular Matter ◽  
Particle Separation ◽  
Internal Force ◽  
Research Field ◽  
Systematic Research ◽  
Gradual Improvement ◽  
System A ◽  
Combined Action ◽  
Motion Characteristics

The motion characteristics of particulate matter are very wonderful. With the development of science and technology, the motion of granular materials has gradually become a hot topic, which has attracted the attention of many scientists and experts. The research of granular matter has gradually become specialized and systematic. With the gradual improvement of the system, a frontier research field particle physics has been formed. Under the combined action of external force and internal force, particles can reflect the properties of fluid, but in the process of flow, it will show different size separation phenomenon from the fluid. The problem of particle separation was formally introduced into the field of physics in 1987. In reality, the existence of particles is not unique. In view of this, the author makes a systematic research and Analysis on the behavior and factors of vibration.

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