Deciding where to place a Wi-Fi router at home to minimise signal blackspots is a fine art. But a physicist has attempted to tackle the problem by mathematically working out the optimum position for a router. He studied how walls and reflections affected signal strength and concluded that, as common sense might suggest, there’s just no beating the centre of a house for router location。
決議在家裏的甚麽地位安排無路線由器來最大水平削減盲點是一門藝術。最近，一名物理學家比來試圖用算法來計劃處路由器的絕佳地位。他研討了墻壁對WiFi旌旗燈號強度的影響，得出一個仿佛是不言而喻的結論：沒有比屋子正中央更好的地位了。
The 'complex' research was carried out by Jason Cole, a PhD physics student at the John Adams Institute at Imperial College London. Frustrated at finding numerous Wi-Fi blackspots around his flat, Mr Cole turned to mathematics to find out how he could improve his internet connection. He found that, the waves were hindered not only by walls and closed doors but also when they went around corners. This, he says, is because the signal loses strength when it bounces off objects。
這項“龐雜”的試驗由傑森·科爾，來自倫敦帝國粹院約翰·亞當斯研討所的物理博士舉行。在本身的公寓發明了太多WiFi旌旗燈號盲點，科爾選取采用算法進步收集銜接速率。他發明WiFi的旌旗燈號流不止被墻壁和門阻攔，一樣也會在角落裏削弱。他以為這是由於當旌旗燈號打仗物體以後會削減一些能量。
‘I found an equation which approximates the behaviour of high-frequency electromagnetic waves such as Wi-Fi, and tried to solve it by placing a virtual router in the floor plan of my flat. After crunching numbers for a few minutes I was able to generate maps of Wi-Fi signal strength inside the flat, showing poor signal near my computer.’
“我發明了一個方程式，它能盤算出WiFi這種高頻電磁感到旌旗燈號的活動軌跡，我在公寓地板上設置了一個假造路由。在測試一段時光的旌旗燈號以後，我就可以繪制出WiFi旌旗燈號在公寓內強弱的圖表，發明電腦閣下較弱的旌旗燈號。”
By showing how weakened the signal can be when it moves across the flat, Mr Cole found that no matter where his router was placed at one side of the flat, there would always be blackspots elsewhere. Instead, he suggests that the only solution to ensure as few blackspots as possible is to place the router in the middle of the flat。
經由過程挪動假造路由器的地位，可以看到旌旗燈號強弱的變更。科爾發明不管將路由器放在公寓的哪一邊，其他處所都邑有盲點。是以，他認為盡量削減盲點的絕佳方法便是把路由器放在公寓中央。
‘There is also some reflection of the signal around corners, but engineers tell me reflections are bad too. In my case, the best position was as central as possible, preferably near open doorways. He says he hasn’t tried any physical tests of the simulation yet, but has been given suggestions by commenters on his website. There have been many other helpful comments which will no doubt improve the methodology in the future, and a surprising number of people asking for an app to test their own houses or offices, so there's plenty of work to do.’
“角落裏一樣也有旌旗燈號反射，然則工程師告知我反射很弱。因此，絕佳的地位是在房間的盡量中間地位，最佳離門口近些。他說他尚未舉行任何物理試驗，然則網站上有人給出了發起。這些發起有的會為將來的辦法論提出更好的改良辦法，並且令咱們驚奇的是，許多人願望能有一款測試本身家裏大概辦公室裏旌旗燈號強弱的app，以是咱們另有很長的路要走。”
ARE WI-FI SIGNALS DANGEROUS?
Wifi旌旗燈號傷害嗎?
Wi-Fi signals use very low intensity radio waves. Whilst similar in wavelength to domestic microwave radiation, the intensity of Wi-Fi radiation is 100,000 times less than that of a domestic microwave oven。
Wifi旌旗燈號應用的是異常低強度的無線電波，其波長與家用微波輻射類似，而其強度則比家用微波爐要弱10萬倍。
The type of radiation emitted by radio waves (Wi-Fi)， visible light, microwaves and mobile phones has been shown to raise the temperature of tissue at very high levels of exposure.This is called a thermal interaction, but researchers are divided as to whether the radiation we receive daily can cause damage。
由無線電波(如Wifi)，可見光，微波和電話發出的輻射，在長期照耀下會使物體溫度升高。這被稱作熱互感化，然則針對這類輻射是不是會對人身材發生傷害，查詢拜訪者們持分歧看法。
The UK Health Protection Agency (HPA) has been monitoring the safety of Wi-Fi. It says people using Wi-Fi, or those in the proximity, are exposed to the radio signals it emits - and some of the transmitted energy in the signals is absorbed in their bodies。
英國康健掩護署曾檢測Wifi的平安性。它的查詢拜訪成果稱，應用大概靠近Wifi的人群都在其輻射規模內，並且旌旗燈號中傳送的一些能量會被汲取進身材中。
However, the signals are very low power. Sitting in a Wi-Fi hotspot for a year results in receiving the same dose of radio waves as making a 20 minute mobile phone call。
但是，這些旌旗燈號的能量很低。在Wifi熱門鄰近坐上一年所汲取的輻射，約莫即是20分鐘通話所發生的無線電波。
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