- 著者
- 辻 健一郎 クンチョロ ドゥイ チャヒョ 渡邊 拓也 小野寺 紀明 猿渡 正俊
- 出版者
- 一般社団法人電子情報通信学会
- 雑誌
- 電子情報通信学会論文誌. C, エレクトロニクス (ISSN:13452827)
- 巻号頁・発行日
- vol.87, no.9, pp.686-695, 2004-09-01
- 被引用文献数
- 6
半導体光増幅器(SOA)の相互利得変調(XGM)を用いた全光波長変換法において,応答速度の改善やパターン効果の低減方法として,CWのアシスト光を用いたSOAの利得回復時間を早める方法が検討されている.アシスト光はSOAの利得曲線上の透明波長に入力することで,SOAの利得低下を抑えつつ効果的にキャリヤの回復を早めることができる.しかしながら,SOAの透明波長はSOA内部のキャリヤ密度とその分布によって変化するため,最適な条件は,入射光の波長,強度,伝搬方向等,SOAの動作条件に大きく影響されると思われる.本論文ではアシスト光の波長や伝搬方向がSOAの応答速度にどのような影響を与えるかを,理論的及び実験的に調べ,最適なアシスト光の条件を検討した.
1 0 0 0 OA 医療化の周辺 : ADHDの出現とその功罪(寳月誠教授退官記念号)
- 著者
- 渡邊 拓也
- 出版者
- 京都大学
- 雑誌
- 京都社会学年報 : KJS
- 巻号頁・発行日
- vol.12, pp.91-108, 2004-12-25
This article aims to examine the effects of emergence and diffusion of ADHD (Attention Deficit Hyperactivity Disorder) in Japan, especially in the field of pedagogy. ln the 1980s, ADHD was listed on DSM-III, the classification of American Psychiatric Association. By 1999, the term ADHD was introduced to Japan, first by a book written for parents who have ADHD children. Also on the governmental level, by the end of the twentieth century in Japan, the Minister of Education decided to introduce American psychiatric diagnostic criteria partially to the education system of primary and secondary schools. The application of the criteria, however, provoked certain problems. a) The brighter side of the application: medically exact diagnosis of ADHD. Problematic behaviour of children was once considered as "childishness". Medical diagnosis has led teachers and parents to abstain from excessive reproach that might lower the children's self-esteem. b) The darker side: confusion between ADHD and quasi-ADHD. ADHD became a magic word that allows teachers, sometimes unjustly, to hold the disease responsible for many other problems at school: wandering in class, violence, long absence from school, etc. Becoming scapegoat of a sort, difficult children who were simply called "childish" have now become suspects of mental disorder. Psychiatric doctors and psychologists, on the one hand, insist on the importance of showing understanding towards the disease, and spread information about it. On the other hand, the term "ADHD" has become so popular and handy that it can be used less carefully to a simply difficult child. In conclusion, it is argued that this paradox of medicalization occurred largely in the process of the information iffusion, rather than as an effect of the discovery of the disease.