SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.周青略微思忖，便踏云而走，飞向东胜神州花果山。MDT started relatively late in our country. At present, in some large medical centers such as Beijing, Shanghai, Guangzhou and Chengdu, MDT diagnosis and treatment mode has been relatively standardized and mature, and plays a role as a benchmark to drive MDT diagnosis and treatment work in hospitals in surrounding regions. However, in general, there are still some problems or misunderstandings in the organization and implementation of MDT in our country. For example, MDT is considered a waste of manpower and time and is not paid enough attention. The organization is not standardized and the personnel are not fixed. It is believed that MDT is limited to consultation of difficult cases. Lack of MDT goals and guidelines; MDT decision-making is not carried out; Communication among various disciplines is not enough to reach consensus. Lack of MDT evaluation system, etc. In order to promote the effective organization and implementation of MDT diagnosis and treatment mode in China, the "Multidisciplinary Comprehensive Treatment Professional Committee of Surgeon Branch of Chinese Medical Association" was established in Beijing on May 15, 2015, referred to as "MDT Special Committee of Surgeon Branch of Chinese Medical Association". The main work objectives of MDT Special Committee are: to promote MDT concept, formulate MDT specifications and consensus; Explore the formulation and promotion of executable MDT organizational forms and processes; Through organizing MDT activities in various regions, help improve MDT cooperation spirit and diagnosis and treatment level in hospitals at all levels in China; Strengthen MDT cooperation and communication between hospitals and break down barriers between hospitals; The Internet will be introduced into MDT activities to promote the development of MDT nationwide. It is hoped that through the work of MDT Special Committee, MDT concept will be deeply rooted in the hearts of the people, standardized and reasonable disease treatment will be realized from MDT mode, more doctors will grow from MDT, andThe death ratio of both sides is 1.54: 1由于订婚突然被取消,Joshy和他几个朋友决定利用本该是他的单身派对狂欢一把，帮助Joshy度过悲伤,于是他们将度假变成一个充满毒品、酗酒、放荡、热水浴缸的喧闹周末。制片人是悉尼弗莱什曼和牛排馆；执行制片人是朱莉安克罗米特，马辛易卜拉欣，阿丽莎纳瓦罗，克里斯卡拉巴洛，贾森阿尔维德雷斯，亚当努西诺和格兰特柯蒂斯。
