Wednesday, 26 March 2014

Dating events

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Speed dating



Speed dating is a formalized matchmaking process or dating system whose purpose is to encourage people to meet a large number of new people. Its origins are credited to Rabbi Yaacov Deyo of Aish HaTorah. originally as a way to help Jewish singles meet and marry. [ 1 ] [ 2 ] [ 3 ] SpeedDating . as a single word, is a registered trademark of Aish HaTorah. Speed dating . as two separate words, is often used as a generic term for similar events.



Contents



Organization [ edit ]



Usually advance registration is required for speed dating events. Men and women are rotated to meet each other over a series of short "dates" usually lasting from three to eight minutes depending on the organization running the event. At the end of each interval, the organizer rings a bell, clinks a glass, or blows a whistle to signal the participants to move on to the next date. At the end of the event participants submit to the organizers a list of who they would like to provide their contact information to. If there is a match, contact information is forwarded to both parties. Contact information cannot be traded during the initial meeting, in order to reduce pressure to accept or reject a suitor to his or her face.



There are many speed dating events now in the United Kingdom. Canada. and the United States. Requirements for each event vary with the organizer. Specific age range based on gender is a common restriction for events. Many speed dating events are targeted at particular communities: for example, LGBT people, polyamorists. [ 4 ] Christians. [ 5 ] Graduate student speed dating events are common. [ 6 ]



Practice [ edit ]



Some feel that speed dating has some obvious advantages over most other venues for meeting people, such as bars, discotheques. etc. in that everybody is purportedly there to meet someone, they are grouped into compatible age ranges, it is time-efficient, and the structured interaction eliminates the need to introduce oneself. Unlike many bars, a speed dating event will, by necessity, be quiet enough for people to talk comfortably. Speed dating is for singles.



Participants can come alone without feeling out of place; alternatively it is something that women who like to go out in groups can do together. [ 7 ]



Because the matching itself happens after the event, people do not feel pressured to select or reject each other in person. On the other hand, feedback and gratification are delayed as participants must wait a day or two for their results to come in.



The time limit ensures that a participant will not be stuck with a boorish match for very long, and prevents participants from monopolizing one another's time. On the other hand, a couple that decides they are incompatible early on will have to sit together for the duration of the round.



Most speed dating events match people at random, and participants will meet different "types" that they might not normally talk to in a club. On the other hand, the random matching precludes the various cues, such as eye contact, that people use in bars to preselect each other before chatting them up.



Online speed dating [ edit ]



Several online dating services offer online speed dating where users meet online for video, audio or text chats. The advantage of online speed dating is that users can go on dates from home as it can be done from any internet enabled computer. The disadvantage is people do not actually meet one another.



Scientific research [ edit ]



There have been several studies of the round-robin dating systems themselves, as well as studies of interpersonal attraction that are relevant to these events. Other studies found speed-dating data useful as a way to observe individual choices among random participants.



First impressions [ edit ]



A 2005 study at the University of Pennsylvania of multiple HurryDate speed dating events found that most people made their choices within the first three seconds of meeting. Furthermore, issues such as religion, previous marriages, and smoking habits were found to play much less of a role than expected. [ 8 ] [ 9 ]



A 2006 study in Edinburgh, Scotland showed that 45% of the women participants in a speed-dating event and 22% of the men had come to a decision within the first 30 seconds. It also found that dialogue concerning travel resulted in more matches than dialogue about films. [ 10 ]



In a 2012 study, researchers found that activation of specific brain regions while viewing images of opposite-sex speed dating participants was predictive of whether or not a participant would later pursue or reject the viewed participants at an actual speed dating event. Men and women made decisions in a similar manner which incorporated the physical attractiveness and likability of the viewed participants in their evaluation. [ 11 ]



Subconscious preferences [ edit ]



Malcolm Gladwell 's book on split-second decision making, Blink , introduces two professors at Columbia University who run speed-dating events. Drs. Sheena Iyengar and Raymond Fisman found, from having the participants fill out questionnaires, that what people said they wanted in an ideal mate did not match their subconscious preferences. [ 12 ] [ 13 ]



Olfaction and the MHC [ edit ]



A 1995 study at the University of Bern showed that women appear to be attracted to the smell of men who have different MHC profiles from their own, and that oral contraceptives reversed this effect. [ 14 ]



The MHC is a region of the human genome involved with immune function. Because parents with more diverse MHC profiles would be expected to produce offspring with stronger immune systems. dissimilar MHC may play a role in sexual selection.



A speed "date" lasting several minutes should be long enough for the MHC hypothesis to come into play, provided the participants are seated close enough together. [ citation needed ]



Olfaction and pheromones [ edit ]



The TV newsmagazine 20/20 once sent both a male and a female set of twins to a speed dating event. One of each set was wearing pheromones. and the ones wearing pheromones received more matches. [ 15 ]



Age and height preference [ edit ]



A 2006 study by Michele Belot and Marco Francesconi into the relative effects of preference versus opportunity in mate selection showed, while concluding that opportunity was more important than preference, that a woman's age is the single most important factor determining demand by men. [ 16 ] Although less important than it is to men, age is still a highly significant factor determining demand by women.



The same study found that a man's height had a significant impact upon his desirability, with a reduction in height causing a decrease in desirability at the rate of 5% per inch.



Selectivity [ edit ]



Studies of speed dating events generally show more selectivity among women than among men. For instance, the Penn study reported that the average man was chosen by 34% of the women and the average woman was chosen by 49% of the men. [ 8 ] New studies suggest that the selectivity is based on which gender is seated and which is rotating. This new study showed that when men were seated and the women rotated, the men were more selective. [ 17 ]



Spin-offs [ edit ]



The popularity or charm of speed dating has led to at least one offspring: Speed Networking. A structured way of running business networking events with the goal of making meeting potential business contacts easier and more productive. Some speed dating companies have now started offering free speed dating where you do not pay unless you meet somebody you like.



Business speed dating has also been used in China as a way for business people to meet each other and to decide if they have similar business objectives and synergies. [ citation needed ] Speed dating offers participating investors and companies an opportunity to have focused private meetings with targeted groups in a compact time frame.



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Dating



Dating is a part of human mating process whereby two people meet socially for companionship. beyond the level of friendship. or with the aim of each assessing the other's suitability as a partner in an intimate relationship or marriage. It can be a form of courtship consisting of social activities done by the couple. While the term has several meanings, it usually refers to the act of meeting and engaging in some mutually agreed upon social activity in public, together, as a couple.



History [ edit ]



Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries. From the standpoint of anthropology and sociology. dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine. As humans have evolved from hunter-gatherers into civilized societies and more recently into modern societies, there have been substantial changes in the relationship between men and women, with perhaps the only biological constant being that both adult women and men must have sexual intercourse for human procreation to happen. [ 3 ]



Humans have been compared to other species in terms of sexual behavior. Neurobiologist Robert Sapolsky constructed a reproductive spectrum with opposite poles being tournament species. in which males compete fiercely for reproductive privileges with females, and pair bond arrangements, in which a male and female will bond for life. [ 4 ] According to Sapolsky, humans are somewhat in the middle of this spectrum, in the sense that humans form pair bonds, but there is the possibility of cheating or changing partners. [ 4 ] These species-particular behavior patterns provide a context for aspects of human reproduction. including dating. However, one particularity of the human species is that pair bonds are often formed without necessarily having the intention of reproduction. In modern times, emphasis on the institution of marriage, generally described as a male-female bond, has obscured pair bonds formed by same-sex and transsexual couples, and that many heterosexual couples also bond for life without offspring, or that often pairs that do have offspring separate. Thus, the concept of marriage is changing widely in many countries.



Historically, marriages in most societies were arranged by parents and older relatives with the goal not being love but legacy and "economic stability and political alliances", according to anthropologists. [ 5 ] Accordingly, there was little need for a temporary trial period such as dating before a permanent community-recognized union was formed between a man and a woman. While pair-bonds of varying forms were recognized by most societies as acceptable social arrangements, marriage was reserved for heterosexual pairings and had a transactional nature, where wives were in many cases a form of property being exchanged between father and husband, and who would have to serve the function of reproduction. Communities exerted pressure on people to form pair-bonds in places such as Europe ; in China. according to sociologist Tang Can, society "demanded people get married before having a sexual relationship" [ 6 ] and many societies found that some formally recognized bond between a man and a woman was the best way of rearing and educating children as well as helping to avoid conflicts and misunderstandings regarding competition for mates.



Как известно, что не измеряется, то нельзя улучшить. И если про замеры на бэкенде (сколько времени выполняются запросы к базе, как быстро генерируется страницы, сколько запросов в секунду может обрабатывать веб-сервер) знают и выполняют их почти все разработчики, то client side производительности незаслуженно уделяется значительно меньше внимания. Быстрый ли DNS, хороший ли канал у хостера, закэширована ли статика, не перегружен ли сайт javascript'ом - все это помогает оценить Navigation timing API.



В докладе мы расскажем о том, как делали систему аналитики, основанную на Navigation timing API, для десятков тысяч сайтов:



- Как сделать подобную систему за 1 месяц и $1000, используя в Amazon Web Services (AWS) Kinesis и DynamoDB.



- Как быстро (очень быстро!) принимать миллионы хитов с помощью Nginx+Lua.



- Как в реальном времени обрабатывать миллионы хитов, постоянно агрегируя данные (потоковая обработка BigData. без хранения BigData).



В большинстве современных баз данных предусмотрена возможность масштабировать рабочую нагрузку, превышающую мощность одной машины. Но обслуживание базы данных на нескольких машинах намного сложнее, чем на одной машине. Когда возникает потребность масштабировать, она возникает неожиданно и в большом количестве, чтобы справиться с новыми проблемами – такими, как соответствие индекса и балансировка нагрузки.



В данном докладе я расскажу о двух типичных проблемах, с которыми сталкиваются базы данных с горизонтальным масштабированием, дам обзор того, как основные конкуренты справляются с этими проблемами, а затем покажу, как TokuMX решает эти проблемы благодаря особым свойствам индексирования фрактальных деревьев. Также я буду обсуждать с вами собственно структуру данных фрактальных деревьев и объясню, как она помогает достичь необходимых свойств для оптимизаций TokuMX.



Сети вокруг нас. Любой объект окружающего нас мира можно представить в виде совокупности объектов и связей между ними. Если объектов становится слишком много, а связи между ними слишком сложны, поневоле приходится задуматься о том, как полученную сеть эффективно хранить и обрабатывать. Классические алгоритмы и структуры данных пасуют уже на сравнительно небольших графах.



Что делать, если объект вашего исследования это весь веб-граф Рунета, граф Твиттера, дорожная сеть Европейского союза или граф знаний Google? Как корректно и быстро вычислить диаметр графа, найти компоненты связности, кратчайшее расстояние между всеми парами вершин или разрушить минимальное остовное дерево?



Многие без оглядки бросаются в омут Neo4j и других графовых баз данных, кто-то изобретает свои способы компактного хранения графа в оперативной памяти, а некоторые прибегают к мощи парадигмы MapReduce.



Традиционная MapReduce парадигма не оправдывает себя при выполнении расчетов на больших графах. Большая часть современных фреймворков обработки графов построено на основе модели Bulk Synchronous Parallel, в том числе и знаменитые Pregel и Apache Giraph.



Дивный мир Graph Mining и Large-Scale Graph Processing приковывает к себе взгляды многих исследовательских компаний и увлеченных теорией графов программистов, вовлекая в процесс создания новых алгоритмов и открытых инструментов. Это увлекательная, но тернистая тропа. А дорогу, как известно, осилит идущий.

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