三年级练写之6：“写一处景物”简快导写

去学校的周围或郊外走一走，看一看，选一处你喜欢的景物，仔细观察，把你的发现写下来。学习《富饶的西沙群岛》按顺序写景的方法，并用上平时积累的好词佳句。

“尽信书不如无书”——“古之人不余欺”的“古之人”是郦道元吗?

大多数参考资料都认为,苏轼的《石钟山记》里所说的＂古之人不余欺＂的＂古之人＂是郦道元。但笔者认为,只要仔细地加以推敲,就能否定上述观点,这个＂古之人＂应是为石钟山命名的人,而绝对不是郦道元。可以从这个句式本身出发,进而从文章所出现的人物阐述,再从苏轼的性格以及文章中的三处写疑去探讨。

ENERGY EFFICIENT DISTRIBUTED STEGANOGRAPHY FOR SECURE COMMUNICATION IN WIRELESS MULTIMEDIA SENSOR NETWORKS

A secure communication mechanism is necessary in the applications of Wireless Multimedia Sensor Networks (WMSNs), which is more vulnerable to security attacks due to the presence of multimedia data. Additionally, given the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes, security and privacy policies have to be combined with energy-aware algorithms and distributed processing of multimedia contents in WMSNs. To solve these problems in this paper, an energy efficient distributed steganography scheme, which combines steganography technique with the concept of distributed computing, is proposed for secure communication in WMSNs. The simulation results show that the proposed method can achieve considerable energy efficiency while assuring the communication security simultaneously.

丑态书风说

这些年欣赏书法展览,有两个很深的印象,一是幅式都变长了,展厅有多高,幅式就有多长,甚至拖延到地板上。再一个是把字写丑了,竞相丑化、有意为之。想把字往美观处写的人反而少了。我们对一件作品的认识,尽管千百年来审美观随时迁移,但是对于用笔、结体、章法的重要性却是承认的。大书家的用笔都是精到的,小书家则未必,多败笔。一件作品的美观,从微观处说,就是用笔在起作用。