共查询到20条相似文献,搜索用时 62 毫秒
1.
当今智能手机不断发展,功能日益强大,在日常生活中的应用也越来越广泛。随着个人业务更多的在移动终端上进行,个人重要数据越来越多地被存储于智能手机终端。手机一旦遗失带来的信息泄露问题将非常严重,因此智能手机上的移动信息安全问题值得研究。目前,针对于手机防盗的软件层出不穷,但是大多数都是手机防盗追踪功能,就是在手机被盗后,利用Android广播机制,当手机用户开启防盗追踪后,程序将监听手机开机启动,通过监听手机用户SIM卡的IMSI码改变来判断手机安全状态,监听并截获安全短信内容,实现非法用户的手机号码向合法用户预先设置的安全号码发送短信、GPS定位信息、照片等特殊信息进行追踪,已找回丢失的手机。本系统旨在开发的基于场景感应的android手机防盗系统是专门针对手机用户在不同的场景下预防被盗的一款手机应用。通过光感应、重力感应、蓝牙等技术构造相应模块,使得在不同场景中手机被盗的时刻,手机瞬时发出报警讯号,使用户在第一时间获取手机被盗信号,及时做出防盗行为。此防丢失系统能够使得用户及时地发现手机被盗,从而最大程度上的防止手机被盗,而不至于到手机被盗后才发现,再利用追踪去找回,这样工作量更大而且找回的可能性不一定高。根据市场调查以及分析,本系统主要根据生活中易被盗的公车/地铁、购物、就餐三大情景进行场景感应防盗,运用光感应、重力感应、蓝牙等技术实现,本系统的特色功能是智能模式,系统能通过传感器智能地识别场景,进行不同的感应防盗,更大程度地方便用户的需求,同时使得手机处于更加安全的环境下。 相似文献
2.
3.
GPS全球定位系统是美国上世纪研制并建成的具有海、陆、空全方位实时三维导航与定位能力的卫星导航定位系统。GPS具有全天候工作、定位精度高、工作效率高、操作简便、携带方便、功能多用途广等特点,其应用领域不断扩大。随着林业科技水平的不断提高,GPS等高科技产品和技术在林业工作中的应用越来越广泛,GPS在林业调查规划、森林防火、有害生物防控等工作中得到了广泛应用,目前GPS在森林巡护中也发挥了非常重要的作用,提高了工作效率,保证了巡护工作的有效性。 相似文献
4.
GPS (Global Position Systern)全称为全球定位系统。随着全球数字化进程,微电子技术和GIS技术获得重大进展,卫星导航、定位的理论趋于成熟。GPS技术具有功能较多、应用广泛;观测时间短、操作简便;定位精度高、全天候作业等特点,作为通用设备越来越多地应用于科研和民用领域。本文主要分析了GPS测量技术在测绘工程的应用。 相似文献
5.
0.引言GPS是英语Global Positioning System的三个字头。即全球定位系统。是一种卫星导航系统。它是现代电子信息技术与空间技术相结合的杰出成果。GPS是继惯性导航系统之后,在导航技术领域内的又一项重大革命,它的应用将使传统的导航技术产生飞跃。GPS的功能几乎可以取代目前所有无线电导航系统它的用途极为广泛,除能为航天、航空、 相似文献
6.
7.
8.
GPS是以接收卫星传递的信息进行现地定位和导航等技术的系统.它不受时间和空间的限制,定位、导航方便,准确、快捷.具有全天候、高精度、高效率的显著特点.在林业工作中应用非常广泛,特别是“退耕还林”工程及“三北”防护林工程的全面开展以及森林资源一类清查和森林防火工作中的应用更加广泛,结合实际工作,谈一下GPS在实际工作中的应用. 相似文献
9.
本文作者讨论如何将北斗导航卫星的定位和短报文通信服务应用到船舶中,从电子海图系统、雷达、船位报告和船舶监控、船舶交通管理系统中找到切入点,与其结合,使北斗导航卫星系统能够在航海中发挥更大的作用。 相似文献
10.
煤矿测量在煤矿生产过程中发挥着重要的作用.随着测绘技术的不断发展,GPS(RTK)技术在测量中的应用范围越来越广,RTK测量技术在露天矿测量工作显示出了其独特的优势,得到了广泛的应用.本文对GPS(RTK)系统在露天矿测量工程中的应用及其优势进行了详细论述. 相似文献
11.
12.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
13.
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
19.
以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
20.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献