Quadrature signals, also called IQ signals, IQ data or IQ samples, are often used in RF applications. They form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. This post looks at the concept of IQ signals and how…

<지난 연재> (1) 청와대 습격사건 전말: 서울에 나타난 바바리코트 사내들 북한특수 부대는 땅으로 꺼진 것도 아니고, 그렇다고 하늘로 솟은 것도 아니었다. 그들은 우리 군의 예상을 뒤엎는 속도로 포위망보다 앞서 내달렸다. 당시 우리나라 국군의 행군 속도는 시속 4킬로미터였다. 국방부는 이를 기준으로 124부대의 이동 경로를 예상하고 포위망을 설치했다. 그러나 124부대는 30킬로에 육박하는 군장을 메고 산악지대를 무려 시속 12킬로의 속도로 내달렸다. 이는 백 미터를 30초대로 주파하는 속도이다. 훗날 국방부 관계자는 자기…

Thirty years ago, a new educational building was constructed in Bloomsbury, and they added a roof garden, which happens to be open to the public. The roof garden isn’t the same one that opened in 1995 though, as it was revamped in 2001 from a plain roof terrace space into a Japanese garden. The…

2025-02-10 Digging around your file system is probably not many's idea of fun, content to live in your /home/ directory and that be that. But there can be benefit in doing some exploring, seeing what other functionality your machine offers, and trying to think about them in new contexts. One…

기사를 읽어드립니다 5:44 슈베르트(1797~1828)의 친구인 화가 레오폴트 쿠펠비저(1796~1862)의 수채화 ‘아첸브루크에서의 파티 게임’(Gesellschaftsspiel der Schubertianer in Atzenbrugg, 1821, 빈 박물관). 팬터마임 놀이를 하는 귀족 친구들로부터 왼쪽 피아노 앞에 슈베르트가 떨어져 있다. 나무처럼 선 이가 쿠펠비저다. 목말을 탄 이가 쇼버로 추정된다. 이 장소가 빈 서쪽 아첸브루크에 있는 쇼버의 성이다. 같이 들을 클래식 슈베르트, ‘겨울 나그네’ 제1곡 ‘잘 자요’ “작은…

북한 최정예 특수부대 124부대의 창설 배경 출처 - <더 중앙> 1967년 4월, 민족보위성 정찰국은 위대한 수령 동지의 지령을 이행하기 위해 특수부대를 창설했다. 이들의 주 임무는 38선을 넘어 남한 정부 주요 요인 암살 및 기관 폭파 등이었다. 인간병기들로 구성된 124 특수부대 2,400명 중 최정예 부대원 31명을 선발하라는 지시가 내려졌다. 남한 최고위층 암살 임무를 맡게 될 이들은 25세 전후의 미혼 남성 중에서 선발되었다. 임무를 완수하기에 한 집안의 가장은 부적합 요건이었다. 특수부대원 중에서도 최강의 전투력을 갖춘…

This is a general audience deep dive into the Large Language Model (LLM) AI technology that powers ChatGPT and related products. It is covers the full training stack of how the models are developed, along with mental models of how to think about their "psychology", and how to get the best use them…

This is a long passageway that runs south behind Knightsbridge’s posh Harvey Nichols department store and was once full of horses and now more back of shop entrances to the posh buildings it slips between. The passageway emerged as the back of housing that started to fill up along Sloane Street in…

Here is a rough approximation of float multiplication (source): float rough_float_multiply(float a, float b) { constexpr uint32_t bias = 0x3f76d000; return bit_cast(bit_cast(a) + bit_cast(b) - bias); } We’re casting the floats to ints, adding them, adjusting the exponent, and returning as float. If…

Image: Matt Brown London's first skyscraper was built in 1925. We've seen four distinct waves since. 100 years ago, London was a flat city, punctuated only by steeples, chimneys and the dome of St Paul's. It is now a vertical metropolis with 101 buildings taller than the old cathedral. Indeed, 2025…

index about blog work now Feb 07 compilers assembly zig programming-languages After part 2, you should have a decent understanding of instruction encoding for your machine's CPU architecture—ARMv8a in my case—and how to generate and execute machine instructions at runtime with mmap. That we will map…

The pretty — and pretty historical — city of Winchester is doable as a day trip from London, but you might even want to make a weekend of it. Here's our guide on getting the most out of it. Alfred the Great takes centre stage in Winchester. Image: Londonist Getting to and around Winchester from…

▲'모두의 숲' 내부의 모습 ⓒ 김종성 언제부턴가 여행에서 '랜드마크'에 대한 개념이 달라졌다. 여행 책자의 첫 페이지를 장식할 법한 유명한 관광지도 좋지만, 그보다는 세심하게 정보를 찾아봐야 알 수 있는 랜드마크에 관심이 쏠린다. '여기에 이런 곳이 있었어?' 그럴 때마다 마치 숨겨진 보물을 찾았을 때 느끼는 희열을 얻는다. 아마도 여행지를 선정할 때 대도시에서 소도시로 시선이 옮겨간 것도 영향을 미쳤을 것이다. 올해 초 일본 나고야(名古屋)로 여행을 떠나기로 결정한 이유 중 하나는 (나고야에게 조금 미안하지만)…

▲산신각에서 내려다 본 심원사 풍경. 왼쪽으로 멀리 대구 시내의 스카이라인이 손에 잡힐 듯 가깝다.서부원 도피하듯 산중으로 숨어들었다. 지난해 말 '12.3 내란 사태' 후 온 국민의 스트레스 지수가 하늘을 찌르고 있다. 광장은 탄핵을 찬성하는 집회와 반대하는 집회로 두 쪽 났고, 언론도 중심을 잃고 부화뇌동하며 혼란을 부추긴다. 언제부턴가 뉴스를 검색하는 게 자해 행위가 됐다. 나 역시 탄핵 찬반 집회 현장을 줄곧 찾아다녔고, 그때마다 상황 보고하듯 글을 썼다. 거창하게 말하면, 민주 시민으로서 의무감 같은 것이었다. 글이 공유될…

Thoughtful stories for thoughtless times. Longreads has published hundreds of original stories—personal essays, reported features, reading lists, and more—and more than 13,000 editor’s picks. And they’re all funded by readers like you. Become a member today. I want to support Longreads A Note on…

What It Means A malapropism is an amusing error that occurs when a person mistakenly uses a word that sounds like another word but that has a very different meaning. // "It's lovely to see all of you on this suspicious occasion," our host said. A flurry of snickers were heard in reply; the…

What It Means To finesse something is to bring it about, direct it, or manage it by skillful maneuvering. // We managed to finesse a favorable deal on some Beatles LPs at the flea market through subtle bargaining. See the entry > finesse in Context “Many times, the teams that can lead a company to a…

Physics Mathematics Biology Computer Science Topics Archive Blog Columns Interviews Podcasts Puzzles Multimedia Videos About Quanta An editorially independent publication supported by the Simons Foundation. Follow Quanta Newsletter Get the latest news delivered to your inbox. Recent newsletters Gift…

중앙SUNDAY 뉴스 먼나라 이웃나라 역사 프리즘 [먼나라 이웃나라 역사 프리즘] <66> 독일과 숲 중앙선데이 입력 2025.02.07 15:30 업데이트 2025.02.07 21:50 928호 29면 중앙일보 지면보기 서비스는 로그인 후 이용 가능합니다. 최근 1개월 내 지면만 열람하실 수 있습니다. 중앙일보 지면보기 서비스는 로그인 후 이용 가능합니다. 로그인 하시면 최신호의 전체 내용을 보실 수 있습니다. 로그인 하시겠습니까? 더중앙플러스 회원이 되시면 창간호부터 전체 지면보기와 지면 다운로드가 가능합니다. 더중앙플러스…

Try it on GfG Practice Given an array arr[] of integers and an integer k, your task is to find the maximum value for each contiguous subarray of size k. The output should be an array of maximum values corresponding to each contiguous subarray. Examples : Input: arr[] = [1, 2, 3, 1, 4, 5, 2, 3, 6], k…

Given two sorted arrays, arr[], brr[] of size N, and M, the task is to merge the two given arrays such that they form a sorted sequence of integers combining elements of both the arrays. Examples: Input: arr[] = {10}, brr[] = {2, 3} Output: 2 3 10 Explanation: The merged sorted array obtained by…

Try it on GfG Practice Given a 2d integer array arr[][] of order k * n, where each row is sorted in ascending order. Your task is to find the smallest range that includes at least one element from each of the K lists. If more than one such ranges are found, return the first one. Examples: Input:…

Try it on GfG Practice Given a data stream arr[] where integers are read sequentially, the task is to determine the median of the elements encountered so far after each new integer is read. There are two cases for median on the basis of data set size. If the data set has an odd number then the…

Try it on GfG Practice Given k sorted linked lists of different sizes, the task is to merge them all maintaining their sorted order. Examples: Input: Output: Merged lists in a sorted order where every element is greater than the previous element. Input: Output: Merged lists in a sorted order where…

In this article, we will be discussing one of the most commonly known shortest-path algorithms i.e. Dijkstra's Shortest Path Algorithm which was developed by Dutch computer scientist Edsger W. Dijkstra in 1956. Moreover, we will do a complexity analysis for this algorithm and also see how it differs…

Try it on GfG Practice Given K sorted arrays, merge them and print the sorted output. Examples: Input: K = 3, arr = { {1, 3, 5, 7}, {2, 4, 6, 8}, {0, 9, 10, 11}} Output: 0 1 2 3 4 5 6 7 8 9 10 11 Input: k = 4, arr = { {1}, {2, 4}, {3, 7, 9, 11}, {13} } Output: 1 2 3 4 7 9 11 13 Table of Content…

Try it on GfG Practice Given an array arr[] of size n, the task is to find the kth largest sum of contiguous subarray within the array of numbers that has both negative and positive numbers. Examples: Input: arr[] = [20, -5, -1], k = 3 Output: 14 Explanation: All sum of contiguous subarrays are (20,…

Given an array interval of length N, where each element represents three values, i.e. {startTime, endTime, value}. The task is to find the maximum sum of values of at most two non-overlapping intervals. Example: Input: interval[] = [[1, 3, 2], [4, 5, 2], [2, 4, 3]] Output: 4 Explanation: Select…

Try it on GfG Practice Given a string s of lowercase alphabets and a number k, find the minimum value of the string after removal of k characters. The value of a string is defined as the sum of squares of the count of each distinct character. Examples: Input: s = "abbccc", k = 2 Output: 6…

Try it on GfG Practice Given two arrays a[] and b[] of size n. The task is to maximize the first array by using the elements from the second array such that the new array formed contains n greatest but unique elements of both the arrays giving the second array priority (All elements of second array…

Try it on GfG Practice Given an input stream of n integers, represented as an array arr[], and an integer k. After each insertion of an element into the stream, you need to determine the kth largest element so far (considering all elements including duplicates). If k elements have not yet been…

Try it on GfG Practice Given an array arr[] and an integer k, the task is to find k largest elements in the given array. Elements in the output array should be in decreasing order. Examples: Input: [1, 23, 12, 9, 30, 2, 50], k = 3 Output: [50, 30, 23] Input: [11, 5, 12, 9, 44, 17, 2], k = 2 Output:…

Given a binary search tree which is also a complete binary tree. The problem is to convert the given BST into a Min Heap with the condition that all the values in the left subtree of a node should be less than all the values in the right subtree of the node. This condition is applied to all the…

Try it on GfG Practice Given two integer arrays A and B of size N each. A sum combination is made by adding one element from array A and another element of array B. The task is to return the maximum K valid sum combinations from all the possible sum combinations. Note: Output array must be sorted in…

Try it on GfG Practice You are given a sorted array arr[] containing unique integers, a number k, and a target value x. Your goal is to return exactly k elements from the array that are closest to x, excluding x itself if it is present in the array. An element a is closer to x than b if: |a - x| <…

Try it on GfG Practice Given two binary max heaps, the task is to merge the given heaps to form a new max heap. Examples : Input: a[] = {10, 5, 6, 2}, b[] = {12, 7, 9} Output: {12, 10, 9, 2, 5, 7, 6} Merge Two Binary Max Heaps Input: a[] = {2, 5, 1, 9, 12}, b[] = {3, 7, 4, 10} Output: {12, 10, 7, 9,…

Given a stream of integers represented as arr[]. For each index i from 0 to n-1, print the multiplication of the largest, second largest, and third largest element of the subarray arr[0...i]. If i < 2 print -1. Examples: Input: arr[] = {1, 2, 3, 4, 5} Output: -1 -1 6 24 60 Explanation: for i = 2…

Given an array of elements, sort the array in decreasing order using min heap. Examples: Input : arr[] = {5, 3, 10, 1} Output : arr[] = {10, 5, 3, 1} Input : arr[] = {1, 50, 100, 25} Output : arr[] = {100, 50, 25, 1} Prerequisite: Heap sort using min heap. Using Min Heap Implementation - O(n Log n)…

Try it on GfG Practice A priority queue is a type of queue that arranges elements based on their priority values. Each element has a priority associated. When we add an item, it is inserted in a position based on its priority.Elements with higher priority are typically retrieved or removed before…