Detection of High-impact Movements in a Volleyball Match: A Cross-Sectional Study

Yasuharu Nagano(Yasuharu Nagano ),Shogo Sasaki(Shogo Sasaki ),Yuka Kose(Yuka Kose ),Hiroshi Ichikawa(Hiroshi Ichikawa ) 사피엔시아 2020 Exercise Medicine Vol.4 No.-

Objectives: Detection of the frequency or intensity of high-impact movements during volleyball match would help understand physical load causing the injuries. The present study aimed to classify different volleyball-specific high-impact movements based on the measurement of trunk acceleration in a volleyball match as a cross-sectional study. Methods: Linear accelerations of six female volleyball players were measured during a single volleyball match. The instances at which >4G and >6G of resultant acceleration was generated were detected. Movements recorded with a synchronized video were also detected and categorized. Counts (cases) and frequencies (cases/min) of the detected movements were calculated, and the resultant and each directional acceleration among the top seven volleyball-specific detected movements were compared. Results: For attackers, 361 and 97 movements were detected for the resultant acceleration thresholds over 4G and 6G, respectively. Landing, takeoff and running were the top three detected movements in both thresholds. Landing was the most frequently observed high-impact movement, and the ratio of landing over 6G was greater among all detected movements compared with the ratios of landing over 4G threshold. For receivers, 297 and 38 movements were detected for the resultant acceleration thresholds over 4G and 6G, respectively. Running, steps on the spot, and steps forward or backward were the top three detected movements. The top seven detected volleyball-specific movements generating over 4G were landing after blocking, landing after spiking, takeoff before spiking, takeoff before blocking, stationary steps during receiving, steps forward or backward during receiving and sidesteps during receiving. Resultant and vertical accelerations of landing after spiking were significantly greater than those of the other six movements (p < 0.001). Conclusions: Using the results of present study, we were able to estimate the physical load causing injuries during a real volleyball match.

「働き方改革」- 2018年通常国会における労働法改正 -

Nagano Hitomi 서강대학교 법학연구소 2019 서강법률논총 Vol.8 No.1

In this presentation, I will look at the background of Japanese "Labor Reform", discussions in the process of submission of relevant legislation and the contents of the most recently passed "labor reform" law. First, there was a long-term employment practice that guarantees full-time and full-time employment for regular workers in Japan after the Second World War. However, since 1990, worsening economic situation has increased the number of irregular workers and the gap between working conditions and the long working hours between the workers made it impossible to sustain economic growth, which became the background of labor reform. During the process of submitting the 'Labor Reform' bill, the 'Labor Reform Realization Conference' was set up to publicize the 'Labor Reform Implementation Plan' to solve various labor market problems including 'gap' and 'long working hours'. In addition, at the Labor Policy Council, it was suggested such as the upper limit of overtime work, the regulation of the same work and the same wage, and the strengthening of the industrial health function following the Labor Reform Implementation Plan. Based on this, in September, 2017, the Japanese government published the "Labor Reform" proposal for submitting the "Labor Reform" bill to the Parliament. The main contents of the labor reform legislation are ①revision of labor hours regulation according to the Labor Standards Act (restriction of overtime work hours, revision of premium wage for over 60 hours of overtime work for SMEs, promotion of annual paid leave, revision of the time (free working hours) system, establishment of the high-level professional system, expansion of the scope of the discretionary work subject to the planning task), ② addition of the provisions of the employer's responsibility for the working time interval system ③strengthening industrial physicians and occupational health functions in accordance with the amendment of the Labor Safety and Sanitation Act and ④ revising regulations to eliminate the unreasonable treatment gap between regular and irregular workers. Considering the contents of this reform in the future, it is necessary to review desirable working time management and to improve the disparity between regular and irregular workers. It will be the aim of labor reform to improve the conditions of irregular workers and to raise wages. 本発表では, 日本"働き方改革"の背景, 関連法案が提出された過程での議論及び最終的に可決された"働き方改革"の関連法の内容を見てみよう. まず, 働き方改革の背景についてみると, 第2次世界大戦以降, 日本で正規職労働者に終身雇用と年功序列制を保障する長期雇用慣行があったが, 1990年代以降, 経済状況の悪化で非正規職労働者が増加し, 正規職労働者と非正規職労働者間の労働条件の格差と長時間労働で持続的な経済成長ができなくなり, これが働き方改革の背景となった. "働き方改革"法案の提出過程中, "働き方改革実現会議"を設置し, "格差"や"長時間労働"問題を含む様々な労働市場の問題を解決するための"働き方改革実行計画"を公表した. 続いて労働政策審議会において, 時間外労働の上限規制, 同一労働と同一賃金に関する 法整備, 働き方改革実行計画に従った産業保健機能の強化などが建議された. これを基に, 2017年9月, 日本政府は, 「働き方改革」関連法案を国会に提出するための「働き方 改革」要綱を公表した. 働き方改革関連法の主な内容は, ①労働基準法に基づく労働時 間規制に関する改正(時間外労働の上限規制は, 中小企業の月の60時間を超える勤務時 間外労働に対する割増賃金の改定, 年次有給休暇の取得の促進, フレックスタイム(自由 勤務時間)制の改正, 高度専門家制度の創設, 企画業務型裁量労働制対象範囲の拡大), ②労働時間等の設定改善法における勤務時間インターバル制度の事業主の責務規定の追 加③労働安全衛生法の改正に伴う産業医・産業保健機能の強化④正規職と非正規職の 不合理な待遇格差を解消するための規定の整備等を含んだ. 今後, この改革内容を考 慮し, 望ましい労働時間管理を検討すると同時に, 正社員と非正規職との待遇格差を改 善しなければならず, 非正規職の労働条件を改善して賃金を引き上げるのが働き方改革 の趣旨だろう.

Distribution of Actin-Filament Bundles in Myoid Cells and Sertoli Cells of the Rat Testis

Nagano, Toshio,Maekawa, Makiko Chonnam National UniversityResearch Institute of 1992 Chonnam journal of medical sciences Vol.5 No.1

A High Quality Solution Constructive Heuristic for No-Wait Flow Shop Scheduling Problem

Nagano, Marcelo Seido,Miyata, Hugo Hissashi Korean Institute of Industrial Engineers 2016 Industrial Engineeering & Management Systems Vol.15 No.3

This paper deals with the no-wait flow shop scheduling problem in order to minimize the total time to complete the schedule or makespan. It is introduced a constructive heuristic which builds the production schedule from job partial sequences by using an appropriate mechanism of insertion. An extensive computational experiment has been performed to evaluate the performance of proposed heuristic. Experimental results have clearly shown that the presented heuristic provides better solutions than those from the best heuristics existing.

The Effect of Oxygen Introduction on Oxidation Resistance and Cutting Performance of Silicon Nitride Ceramics

Nagano Mituyoshi,Sano Hideaki,Sakaguchi Shigeya,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

In order to clarify the wear resistance as cutting tools, the effect of oxygen addition on oxidation behavior of the β-Si3N4 ceramics with 5 mass% Y2O3 and 2 or 4 mass% Al2O3 was investigated by performing oxidation tests in air at 1300° to 1400°C and cutting performance tests. From test results, we could conclude that the mechanical properties of β-Si3N4 ceramics depending on oxygen introduction are much effective on cutting performance improvements of β-Si3N4 ceramics.

Vertical Migration and Horizontal Distribution of Chaoborus Larvae in Lake Fukami- ike, Japan

Nagano, Mariko,Tanaka, Masaaki,Yagi, Akihiko The Korean Society of Limnology 2005 생태와 환경 Vol.38 No.S

Diel vertical migration (DVM) and horizontal distribution of Chaoborus flavicans larvae were studied in Lake Fukami-ike (maximum depth 7.75 m, Central Japan). The larvae showed a clear migration in the 4 ${\sim}$ 7 m layer during the day and throughout the water column at night. It should be noted that, while old instar distributed throughout the column during the night. Young instar was found only in the 1 ${\sim}$ 4 m layer. An examination of horizontal distribution revealed that larval stage was clearly related with the depth. It suggests that Chaoborus appear to exist in the deeper area during the larval stage.

A Method for Analyzing Alloy Composition of Metallic Restorations and Prostheses Placed in a Patient’s Mouth by Sampling an Ultra Small Amount of Metal Powders

Nagano F,Ida Y,Hashimoto M,Ohno H,Endo K 대한치과재료학회 2011 대한치과기재학회 학술대회 Vol.2011 No.5

Vertical Migration and Horizontal Distribution of Chaoborus Larvae in Lake Fukami-ike, Japan

( Nagano Mariko ),( Masaaki Tanaka ),( Akihiko Yagi ) 한국하천호수학회 2005 생태와 환경 Vol.38 No.S

Inter-Regional and Intra-Regional Trade in East Asia : Recent Developments and Aggregate Bilateral Trade Elasticities

Nagano, Mamoru 세종대학교 국제경제연구소 2003 Journal of Economic Integration Vol.18 No.1

East Astian countries have experienced dynamic structural change in regional trade during the 1990s. While intra-regional trade rapidly progressed within the region after the financial crisis, Asia accounts for a large portion of inter-regional trade volume, even agter the crisis. In this paper, examinations of how inter-tegional and intra-regional trade in five selected crisis countries, i.e., Indonesia, Malaysia, Philippones, Thailand and Korea are evolved by looking at descriptive statistics, verifying the heterogeneity of trade composition, reviewing historical changes of international trade policies and some empirical analyses. This paper's empirical results show that elasticities of export to external demand are much larger than those of the changes in relative price ratio. Therefore, even though regional curencies fall causing the terms of trade t change, the decline in external demand might offset the effects of changes in reative prive ratio. Another empirical result indicates that strengthening the supply side might contribute to the promotion of inter-regional trade of these countries.

일본의 정신보건의료복지의 상황

Nagano Toshihiro,요시노 토모미(번역자) 한국후견·신탁연구센터 2019 후견과 신탁 Vol.2 No.1