Statement: Problem Web Search Engine
Prepared by Kuanhua Chen
Background Problem description Use Cases
Background This system is based on the web search engine of "Yet Another Hierarchical Officious Oracle" (yahoo), which was established of the first trailer version in May 1995. Its original two founders of yahoo are David Filo and Jerry Yang who was the Ph.D. candidates in Electrical Engineering at Standford University. Yahoo has a fast, powerful search engine which can do an extremely complex search. The search engine is just like a card catalogue in a library which has a lot of great and useful information. It helps you sift through all those billions of 1's and 0's to find the specific information you need. Yahoo attempts to organize web by dividing it into topics and subtopics. If you know exactly what subject you are searching for, and have a good sense of how to find your subject within a hierarchies of larger subject, Yahoo is the best place to start. Right now, Yahoo is the most popular search service to help people find information easily. The secret of Yahoo is human being which use largest human complied guide to the web It is using 150 editors and over 1 million sites list. When Yahoo can not find a topic, it automatically sends the query to its partner Google for a searching through Google's index. Yahoo also is a subject tree style catalogue that organizes the web into 14 major topics. It includes all excellent coverage of business related sites. However, if you clear about the topic of your query, you use search engine better choice than web directory. Problem Description During the Yahoo search engine is made by human being, the error may be more than we think. The search engine can be separated in some several error damages, such as empty error, mistype error, symmetric error. These errors consist of several different branch sections based on different topics. The empty error which mean that you can not just use no typing but pressing enter to find anything. The default empty will detect an error message for you, but you should not use default empty to get through anything. If it happens that it in mistyping, the searching could not as user want, because there is less chance to find what user should real mean. The symmetric error which I mean is that if we try to enter the query on C++, the programming language. Search engine will essentially say, "Huh?" because the "C++" is not the word. It is a letter charactors. The
other problem is phrase. Anyone who finished junior high school will be able to tell you where the phrase come from and what it mean, but search engine choke because all the words in the phrase are stop words. There is a problem which we called the keyword searching error. Keyword searches have a tough time distinguishing between words that are spelled the same way, but mean something different. This result could give you completely irrelevant to your query. Also it extend a problem which so-called stemming, as enter "big" should they return a hit on "bigger"? And also some verb tense "-s" or "ed", the search answer could come out so different. When user typing the keywords, you should prevent that mislead keywords. Therefore, user should be make sure the keywords refer to or are directly related to the subject on the page. This search engine not dose provided the multi-language support which is not comfortable for some other users. Sometimes, the searching is not focus only English, this engine could not handle it. Use Case Use Case #1: "Basic" searching engine There are two different types of the searches--"basic" and "advanced". In a basic search, we could just enter a keyword without shifting through any pulldown nemu or additional options. The basic search engine is quite complete easy to handle. Use Case #2: "Advanced" searching engine Advance search refining option differ from one to the other, but it include some ability to search on more complex choice for propose. You may search on proper name, on words that certain proximity to the other search term. Use Case #3: Options under Advanced searching engine The search engine offer updates its index as often as necessary, so updated or outdated link submissions are not necessary. You should be able to pick them up during each crawl. The logical Boolean operators to redefine your search, which using term AND, OR, phrase match, and Intelligent default. Or using search area as categories, and web site. Using scroll bar to choose how long the new lists be added, and its default set in 4 years. Also, a scroll bar for displace matches result per page. The default is 20 pages. The other scroll bar is the choose categories, and the default is auction. Finally, you just type in words to find the web site. The total description could be up to 25 words. Use Case #4: Relevancy Rankings The search engine return results with the information which web user provide that match the query. Even if you do not come up in the top ten for your target keywords, you may find an improvement for target key that you are not anticipating. The additional extra word can suddenly turn up near the top of your list.
Additional Graphy Reference To estimate the completeness of information found by other search engines, User calculated the index of search engine. It was taken as a...