分手之後,過得更好的兩個人
在網頁專案中常會碰到在介面上需透過資料庫提供的資料來進行呈現,這樣的介面在程式開發時通常會透過兩種方法進行, 以下針對上述的兩種方法進行一些工作方式說明與做法上的分享 。
傳統的開發模式
前、後端人員會先針對頁面設計進行可行性的討論,在前端在頁面製作完成後,逐步Release出來給後端工程師,讓後端工程師根據已經製作好的頁面進行施工,他們會在版面中加入後端程式(ASP、PHP、JSP…等),以此方式進行介面設計,最後會在後端工程師處完稿。
![](https://cloudlab.tw/wp/wp-content/uploads/2020/04/IMG_20200113_091650-752x1024-1.jpg)
上圖的動態網頁版面是指將頁面串接上資料庫(Dynamic),透過資料庫的資料來進行呈現,也就是資料是”活的”,通常前端工程師會在版面中先放入一些假資料,讓後端工程師了解呈現風格,此處的動態不是指動畫,任何在頁面上的互動或動畫,應該是由前端工程師來完成。
前、後端分離
理想的做法是後端人員幾乎不用了解前端介面想如何呈現,所有API為前端人員依據頁面開需求給後端,例如產品目錄頁需要一隻API可以呈現:
- 商品名稱
- 價格
- 顏色
- 尺寸
- 依據前端傳入的參數來定義
- 一次給幾筆
- 從第幾筆開始給
- 可透過什麼條件進行篩選
以此方式進行介面設計,最後會在前端開發者處完稿。
![](https://cloudlab.tw/wp/wp-content/uploads/2020/04/IMG_20200113_095724-1024x678-1.png)
前、後端分手後的好處
前、後端合併是傳統的合作模式,當時前端沒有好的方法可以呼叫後端API,所以所有的串接都必須由後端工程師進行協助,而自從前端程式可以透過AJAX的方式呼叫後端程式後,前、後端分離的做法就被廣為應用,他也帶來了以下的優點:
1. 權責區分明確
前、後端分離讓人員可以各自負責自己擅長的部份,前端工程師不會需要碰到伺服器端的程式,後端工程師也不會碰到前端的動畫或版面程式,能將權責清楚的區分出來,不會到時候發生網頁跑版、動畫出問題,但不清楚到底是誰動到了不該動的東西。
所以前、後端分離也就是權責上也更能夠釐清,別小看這個部分,因為這不僅僅讓雙方人員在專案開發上目標更為明確,也能夠讓專案管理變得更輕鬆。
2. 跨平台的API應用
專案中的應用平台有時不僅僅是Web,若有其他平台也有後端的需求,之前開發出來的API規格依然可以生效,就算有修改,也能依照相同的精神調整,對於後端工程師來說工作可以更單純一些。
3. 平行的開工時間
在看到ART Design所設計出來的頁面後,雙方可以迅速討論並且同時開工,不像傳統的專案,後端工程師需要等前端頁面完成後才可以施作,更能夠提升專案上的製作行程。
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What’s on board this flight
Blue Origin had planned to launch a pair of Mars-bound satellites on behalf of NASA for the first flight of New Glenn.
But delays with the rocket’s development prompted the space agency to change course, moving that flight to this spring at the earliest. So for this inaugural flight, Blue Origin opted to instead fly a “demonstrator” that will test technology needed for the company’s proposed Blue Ring spacecraft — which will aim to serve as a sort of in-space rideshare vehicle, dragging satellites deeper into space when needed.
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The demonstrator on this New Glenn flight will remain aboard the rocket for the entire six-hour flight, Blue Origin said, and it will validate “communications capabilities from orbit to ground” as well as “test its in-space telemetry, tracking and command hardware, and ground-based radiometric tracking.”
The Blue Ring Pathfinder demonstrator is part of a deal Blue Origin inked with the US Department of Defense’s Defense Innovation Unit.
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Why Blue Origin wants to reuse rockets
Similar to SpaceX, Blue Origin is aiming to recover and refly its first-stage rocket boosters in a bid to make launches less expensive.
“Reusability is integral to radically reducing cost-per-launch,” the company said in a recent news release, using the same oft-repeated sentiment that SpaceX has touted since it began landing rocket boosters in 2015.
Bezos, however, has acknowledged the importance of reusing rocket parts since he founded the company in 2000 — two years before Musk established SpaceX. And the company has already developed its suborbital New Shepard tourism rocket to be reusable.
“It’s not a copy cat game,” Henry said. “Blue Origin has been pursuing reusable vehicles since before reusable vehicles were cool. Now it’s much more of a mainstream idea (because of SpaceX). The difference is that it’s taken Blue Origin so much longer to get to orbit.”
If successful, returning the New Glenn rocket booster for a safe landing will be a stunning feat. After expending most of its fuel to propel the rocket’s upper stage to space, the first-stage booster will need to make a clean separation. The booster must then maneuver with pinpoint guidance and reignite its engines with precision timing to avoid crashing into the ocean or the Jacklyn recovery platform.
What New Glenn will do
In some ways, New Glenn has already made its mark on the launch industry. Blue Origin has for years pitched the rocket to compete with both SpaceX and United Launch Alliance — a joint venture of Boeing and Lockheed Martin that buys engines from Blue Origin — for lucrative military launch contracts.
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The US Space Force selected Blue Origin, ULA and SpaceX in June to compete for $5.6 billion worth of Pentagon contracts for national security missions slated to launch over the next four years.
Blue Origin also has deals with several commercial companies to launch satellites. The contracts include plans to help deploy Amazon’s Kuiper internet satellites and a recently inked deal with AST SpaceMobile to help launch the Midland, Texas-based company’s space-based cellular broadband network.
New Glenn could also be instrumental in building Blue Origin’s planned space station, called Orbital Reef. Blue Origin and it commercial partners, including Sierra Space and Boeing, among others, hope the station will one day provide a new destination for astronauts as the International Space Station is phased out of service.
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New Glenn vs. other powerful rockets
New Glenn packs significant power. Dubbed a “heavy-lift” vehicle, its capabilities lie between SpaceX’s Falcon 9 rocket and the more powerful Falcon Heavy launch vehicle.
SpaceX’s workhorse Falcon 9, for example, can haul up to 22.8 metric tons (50,265 pounds) to space. While New Glenn is capable of carrying about double that mass, it may also be roughly the same price as a Falcon 9: reportedly around $60 million to $70 million per launch.
“I think in order to compete with Falcon 9, you have to go head-to-head or better on price,” said Caleb Henry, the director of research at Quilty Space, which provides data and analysis about the space sector.
The question, however, is whether Blue Origin will be able to sustain a competitive price point, Henry added.
Still, one feature that makes New Glenn stand out is its large payload fairing, or nose cone. The component protects the cargo bay and is a whopping 23 feet (7 meters) wide — nearly 6 feet (2 meters) larger than that of SpaceX’s Falcon 9 or Falcon Heavy.
Henry said Blue Origin likely opted to outfit New Glenn with such a large fairing in order to help fulfill Bezos’ vision of the future.
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The old frequent-flyer adage is that sitting at the back of the plane is a safer place to be than at the front — and the wreckage of both Azerbaijan Airlines flight 8243 and Jeju Air flight 2216 seem to bear that out.
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The 29 survivors of the Azeri crash were all sitting at the back of the plane, which split into two, leaving the rear half largely intact. The sole survivors of the South Korean crash, meanwhile, were the two flight attendants in their jumpseats in the very tail of the plane.
So is that old adage — and the dark humor jokes about first and business class seats being good until there’s a problem with the plane — right after all?
In 2015, TIME Magazine reporters wrote that they had combed through the records of all US plane crashes with both fatalities and survivors from 1985 to 2000, and found in a meta-analysis that seats in the back third of the aircraft had a 32% fatality rate overall, compared with 38% in the front third and 39% in the middle third.
Even better, they found, were middle seats in that back third of the cabin, with a 28% fatality rate. The “worst” seats were aisles in the middle third of the aircraft, with a 44% fatality rate.
But does that still hold true in 2024?
According to aviation safety experts, it’s an old wives’ tale.
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“If we’re talking about a fatal crash, then there is almost no difference where one sits,” says Cheng-Lung Wu, associate professor at the School of Aviation of the University of New South Wales, Sydney.
Ed Galea, professor of fire safety engineering at London’s University of Greenwich, who has conducted landmark studies on plane crash evacuations, warns, “There is no magic safest seat.”
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A toothy toadstool. A vegetarian piranha with a distinctive mark. And a pygmy pipehorse floating in the Indian Ocean shallows.
These wild wonders were among the hundreds of previously unknown species of animals, plants and fungi that scientists named and described for the first time in 2024, expanding our surprisingly limited knowledge of Earth’s diversity.
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“While it is critical to place protections on known threatened species, we must also allocate resources towards identifying unknown species that may be just as important to the functioning of an ecosystem,” Bennett said.
Researchers connected to the institution described 138 new species in 2024, including 32 fish. One standout was a pygmy pipehorse named Cylix nkosi. The seahorse relative was originally found in 2021 in the cool temperate waters surrounding the North Island of New Zealand, but the species described this year was discovered in the subtropical waters off South Africa, expanding the known range of this group to the Indian Ocean
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“This species is also quite cryptic, about the size of a golf tee, but luckily we spotted a female camouflaged against some sponges about a mile offshore on the sandy ocean floor.”
The researchers involved in describing the new species chose nkosi as its name. A reference to the local Zulu word for “chief,” the name reflects the species’ crown-like head shape and acknowledges South Africa’s KwaZulu-Natal province where it was found.