Use Of Proxy Servers Research Articles

Improving Data Integrity and Quality From Online Health Surveys of Women With Infant Children.

Online surveys have proven to be an efficient method to gather health information in studies of various populations, but these are accompanied by threats to data integrity and quality. We draw on our experience with a nefarious intrusion into an online survey and our efforts to protect data integrity and quality in a subsequent online survey. We aim to share lessons learned regarding detecting and preventing threats to online survey data integrity and quality. We examined data from two online surveys we conducted, as well as findings of others reported in the literature, to delineate threats to and prevention strategies for online health surveys. Our first survey was launched inadvertently without available security features engaged in Qualtrics, resulting in a number of threats to data integrity and quality. These threats included multiple submissions, often within seconds of each other, from the same internet protocol (IP) address; use of proxy servers or virtual private networks, often with suspicious or abusive IP address ratings and geolocations outside the United States; and incoherent text data or otherwise suspicious responses. After excluding fraudulent, suspicious, or ineligible cases, as well as cases that terminated before submitting data, 102 of 224 (45.5%) eligible survey respondents remained with partial or complete data. In a second online survey with security features in Qualtrics engaged, no IP addresses were associated with any duplicate submissions. To further protect data integrity and quality, we added items to detect inattentive or fraudulent respondents and applied a risk scoring system in which 23 survey respondents were high risk, 16 were moderate risk, and 289 of 464 (62.3%) were low or no risk and therefore considered eligible respondents. Technological safeguards, such as blocking repeat IP addresses and study design features to detect inattentive or fraudulent respondents, are strategies to support data integrity and quality in online survey research. For online data collection to make meaningful contributions to nursing research, it is important for nursing scientists to implement technological, study design, and methodological safeguards to protect data integrity and quality and for future research to focus on advancing data protection methodologies.

PENERAPAN TEKNOLOGI CACHE SERVER BERBASIS IoT DENGAN RASPBERRY Pi3 MENGGUNAKAN METODE FORWARD CHAINNING

With the rapid technological development, the growing number of Internet clients over time, the internet access response is slow and it takes filtering of a few websites that can harm users. For that required cache proxy server to speed up internet access time and website filtering. The use of proxy servers usually still use the standard configuration on the proxy server. This configuration can be set or modified (tuning) in such a way as to create a proxy server that is reliable and have better performance. The play on the proxy server is done by changing some parameters that are inside the proxy server application and adapted to the needs of usage on the internet network. The application used to create this proxy server is squid that runs on raspberry pi3 with a rasbian operating system. Squid applications are mostly used in local and internet networks for storing web cache, blocking multiple websites, managing bandwidth up to access restrictions.

MANAJEMEN HAK AKSES KONEKSI INTERNET MENGGUNAKAN SQUID PROXY SERVER DI RELOAD.NET

Internet as information resources have a role that is so important to the community . Things to consider is the Internet in interacting factors of the use of the Internet is the use of Proxy Server is one of the solutions offered to provide Internet safety . One Proxy Server is quite popular today is Squid , Squid Proxy Server is the most widely used program by the network administrator as a program for squid proxy server is open source so it can be modified according to our wishes . Therefore we use the Squid to help in setting permissions in Internet networks required to provide information security data accessed by way of the filter so that the website - a website that can be accessed should not be blocked , limiting Internet bandwidth required in the network in an attempt to equally distribute owned bandwidth according to the number of clients in the Internet network. Internet access required and Restrictions For Internet access can be used that are not held by the client who does not have the right to access the internet. The method used for the design of an internet connection access rights management using a squid proxy server in reload.net consists of several stages: planning , data collection , analysis , design , system design , and preparation of reports. The results of this research is the implementation of ACL Squid Proxy Server is configured by the server to limit the use of the internet so that the client can provide internet accessible data security. Key words : Squid Proxy Server , Unblock sites , limiting bandwidth , restricting internet access

Proxy Server Experiment and Network Security with Changing Nature of the Web

The total reliance on internet connectivity and World Wide Web (WWW) based services is forcing many organizations to look for alternative solutions for providing adequate access and response time to the demand of their ever increasing users. A typical solution is to increase the bandwidth; this can be achieved with additional cost, but this solution does not scale nor decrease users perceived response time. Another concern is the security of their network. An alternative scalable solution is to deploy a proxy server to provide adequate access and improve response time as well as provide some level of security for clients using the network. While some studies have reported performance increase due to the use of proxy servers, one study has reported performance decrease due to proxy server. We then conducted a six-month proxy server experiment. During this period, we collected access logs from three different proxy servers and analyzed these logs with Webalizer a web server log file analysis program. After a few years, in September 2010, we collected log files from another proxy server, analyzed the logs using Webalizer and compared our results. The result of the analysis showed that the hit rate of the proxy servers ranged between 21% - 39% and over 70% of web pages were dynamic. Furthermore clients accessing the internet through a proxy server are more secured. We then conclude that although the nature of the web is changing, the proxy server is still capable of improving performance by decreasing response time perceived by web clients and improved network security.

Proxy Server Experiment and the Behavior of the Web

Use of proxy server could help in providing adequate access and response time to large numbers of World Wide Web (WWW) users requesting previously accessed page. The result of the study showed that hit ratios of the proxy servers range from 21% to 39% for large organization (More number of Users) 40% to 70% for medium organizations (medium number of users) and over 70% of web pages are dynamic. The study indicates the effectiveness of the proxy server and helps to evaluate the trade-off between money spent on higher bandwidth lower latency connections, versus the cost/performance of using caching intermediary. Keywords: caching, hit ratios, Miss, DNS Proxy, performance.

A distributed admission control model for QoS assurance in large-scale media delivery systems

Conventional admission control models incur some performance penalty. First, admission control computation can overload a server that is already heavily loaded. Also, in large-scale media systems with geographically distributed server clusters, performing admission control on each cluster can result in long response latency, if the client request is denied at one site and has to be forwarded to another site. Furthermore, in prefix caching, initial frames cached at the proxy are delivered to the client before the admission decisions are made. If the media server is heavily loaded and, finally, has to deny the client request, forwarding a large number of initial frames is a waste of critical network resources. In this paper, a novel distributed admission control model is presented. We make use of proxy servers to perform the admission control tasks. Each proxy hosts an agent to coordinate the effort. Agents reserve media server's disk bandwidth and make admission decisions autonomously based on the allocated disk bandwidth. We develop an effective game theoretic framework to achieve fairness in the bandwidth allocation among the agents. To improve the overall bandwidth utilization, we also consider an aggressive admission control policy where each agent may admit more requests than its allocated bandwidth allows. The distributed admission control approach provides the solution to the stated problems incurred in conventional admission control models. Experimental studies show that our algorithms significantly reduce the response latency and the media server load.

Using name-based mappings to increase hit rates

Clusters of identical intermediate servers are often created to improve availability and robustness in many domains. The use of proxy servers for the World Wide Web (WWW) and of rendezvous points in multicast routing are two such situations. However, this approach can be inefficient if identical requests are received and processed by multiple servers. We present an analysis of this problem, and develop a method called the highest random weight (HRW) mapping that eliminates these difficulties. Given an object name and a set of servers, HRW maps a request to a server using the object name, rather than any a priori knowledge of server states. Since HRW always maps a given object name to the same server within a given cluster, it may be used locally at client sites to achieve consensus on object-server mappings. We present an analysis of HRW and validate it with simulation results showing that it gives faster service times than traditional request allocation schemes such as round-robin or least-loaded, and adapts well to changes in the set of servers. HRW is particularly applicable to domains in which there are a large number of requestable objects, there is a significant probability that a requested object will be requested again, and the CPU load due to any single object can be handled by a single server. HRW has now been adopted by the multicast routing protocols PIMv2 and CBTv2 as its mechanism for routers to identify rendezvous points/cores.

Visits, hits, caching and counting on the World Wide Web: old wine in new bottles?

Explores the problems of “counting” hits and visits to Web sites on the World Wide Web. Nominally, cyberspace offers unrivalled monitoring and tracking potential when compared with other marketing media. However, further inspection reveals some complicating factors. Identifies the phenomenon of cache memory, the use of proxy servers and trawler software and explores their influence on under‐ and over‐counting. Drawing on the hierarchy of effects model developed by Berthon et al. (1996), presents a series of correction factors. Concludes that the problem of accurate counting on the Web is a new manifestation of an old problem: old wine in new bottles.