Archives

2025

08 Feb Search improvement with index
08 Feb 데이터베이스 개론_Database/ schema/ RDBMS/ Key
08 Feb Zzikzzik CICD_Permission Denied
07 Feb EC2, CICD, Github Actions
01 Feb KOCW_I/O System
01 Feb KOCW_File System
31 Jan Interview_KPT 회고
31 Jan Interview_memory/ paging/ swapping
26 Jan KOCW_Virtual Memory
23 Jan KOCW_Memory Management
21 Jan Interview_Synchronization/ Semaphore/ Deadlock
21 Jan EC2, mysql install, S3, deploy on server
20 Jan KOCW_Deadlock
13 Jan KOCW_Process Synchronization/Race Condition/Semaphore/Mutex
13 Jan KOCW_Memory, Disk Scheduling / Caching
13 Jan Interview_CPU scheduling
13 Jan KOCW_CPU Scheduling
07 Jan Interview_Process/ Thread
05 Jan KOCW_Process Management
04 Jan KOCW_Thread
04 Jan KOCW_Scheduler
04 Jan KOCW_Process/ address space / context / Context Switching
02 Jan KOCW_Memory / Security
02 Jan Interview_운영체제/인터럽트/시스템콜/커널/동기, 비동기
01 Jan KOCW_Synchronous/Asynchronous I/O, DMA

2024

31 Dec KOCW_Computer System Structure / Kernel / Interrupt / System Call
31 Dec KOCW_Introduction
18 Dec AWS, Nginx, Let's encrypt, Certbot, HTTPS
20 Sep JPA
20 Sep Database Optmizier
20 Sep MySQL/ Oracle/ Microsoft SQL
20 Sep DB Clustering/ Replication/ Mirroring
19 Sep Table Full Scan/ Index Range Scan/ Index Full Scan
19 Sep Schema
19 Sep NoSQL
19 Sep ORM
19 Sep Partitioning, Sharding
14 Sep Interview Jscode Study Feedback
14 Sep Starvation/ Aging
13 Sep Interview_cyber security for CV
13 Sep Page Replacement Algorithm
12 Sep Interview_IP address
12 Sep Interview_cyber security
10 Sep Virtual Memory
10 Sep Kernel
07 Sep MQTT Protocol
07 Sep IO 🆚 NIO
01 Sep Reliable Data Transmission
30 Aug MTU, MSS
30 Aug Interview_TCP/UDP
30 Aug Huffman coding
28 Aug Proxy
26 Aug Interview_SOP/ CORS/ REST/ SOAP/ cache/ proxy/load balancing
26 Aug Bandwidth
25 Aug Multi Processing/ Multi Programming/ Multi Tasking/ Multi Threading
25 Aug Time Complexity/ Space Complexity
24 Aug Minimum Spanning Tree
24 Aug Memoization
24 Aug Linear and Non-Linear Data Type
22 Aug IP address
22 Aug Interview_HTTP/HTTPS/Digital Signature/TLS/SSL/DNS/JWT
21 Aug Symmetric/ Asymmetric key algorithm
21 Aug Interview_Network/Packetization/Protocol/OSI/TCPIP/Network Appliances
21 Aug Domain Name System
19 Aug Collection_List/ Set/ Map
18 Aug Memory Structure
18 Aug Red Black Tree
18 Aug AVL Tree
18 Aug Conditions of a good Algorithm
14 Aug Micro Service Architecture
14 Aug Domain Driven Design
12 Aug Encapsulation, Decapsulation
12 Aug Socket Programming
12 Aug Packet
12 Aug How is data transferred over the network?
12 Aug What is network?
10 Aug Interview_Spring/Springboot/MVC/AOP
09 Aug Interview_OSI/TCP/IP/handshake/IOCP
08 Aug Interview_Process/Thread/Deadlock/Paging/Semaphone/Mutex/Segmentation/Virtual Memory
07 Aug Mutable 🆚 Immutable, Final
07 Aug Interview_GC/StringBuilder/JVM/Overloading/Overriding/Abstract/Interface/Generic
06 Aug MVC, MVC Design Pattern
06 Aug Bean Scope
04 Aug UI, UX
04 Aug Logging Level
04 Aug Authentification progression
04 Aug OAUTH
03 Aug Web Server/ WAS
03 Aug Static/ Dynamic Pages
03 Aug Browser
03 Aug HTTP Status Code
03 Aug 18. Vulnerabilities and Attacks
02 Aug 3. Threat Actors
01 Aug 2. Fundamentals of security
30 Jul Serialization
30 Jul Call by value, Call by reference
27 Jul Functional/Sequential/Procedural/Imperative/Declarative Programming
27 Jul Object Oriented Programming
27 Jul Agile
27 Jul Test Driven Development
27 Jul Clean Code/ Refactoring/ Secure Coding
27 Jul Stored Procedure
27 Jul Redis
27 Jul Transaction/ Transaction Isolation Level
27 Jul Index, Index algorithm
27 Jul Anomaly, Normalization
27 Jul SQL Injection
27 Jul Key
26 Jul Blocking/Non Blocking & Synchronous/Asychronous
26 Jul Load Balancing
26 Jul TLS/ SSL HandShake
26 Jul HTTP/ HTTPS
26 Jul Protocol / TCP/IP / Traffic control / Flow control
26 Jul TCP / UDP
26 Jul OSI Layer 7
26 Jul Blocking I/O, Non-Blocking I/O
25 Jul Deadlock
25 Jul Scheduling
25 Jul Inter Process Communication
25 Jul PCB, Contect Switching
25 Jul System Call
25 Jul Interrupt
25 Jul Process Address Space
25 Jul Process, Thread
25 Jul What is Operating System
25 Jul Memory allocation/ Paging/ Segmentation/ Compaction/ Fit
25 Jul Semaphore/ Mutex/ Spinlock
25 Jul Race Condition
24 Jul Trie/ Prefix Tree
24 Jul Hash/ HashMap
24 Jul Binary Search Tree/ Comparison of heap, tree, BST
24 Jul Tree / Graph
24 Jul Heap
24 Jul Stack/ Queue
24 Jul Array/ Array list/ Linked list
24 Jul Linked List
24 Jul B Tree/ Balanced Tree/ B+ Tree
23 Jul Fixed Point/ Floating Point
23 Jul Parity Bits/ Hamming Code
23 Jul Cache Memory, Web Cache
23 Jul CPU
23 Jul ARM processor
21 Jul System Bus
19 Jul Binary Search
19 Jul BitMask
19 Jul Dijkstra Algorithm
19 Jul Dynamic Programming
19 Jul Lowest Common Ancestor
19 Jul Longest Increading Subsequence
19 Jul DFS & BFS
19 Jul Adjacency Matrix, Adjacency List(인접 행렬, 인접 리스트)
19 Jul Hash Table
18 Jul Counting Sort
18 Jul Radix Sort
18 Jul Heap Sort
18 Jul Merge Sort
18 Jul Quick Sort
18 Jul Selection Sort
18 Jul Insertion Sort
18 Jul Bubble Sort
18 Jul Compare all sorts
17 Jul Computer architecture
17 Jul Implementing HTTPS
17 Jul TroubleShooting_Too long to get main page
16 Jul Interview_drugstore
15 Jul Recruitment reference
12 Jul Array_
11 Jul TroubleShooting_Concurrency issue
11 Jul TroubleShooting_Get just one user role as string from list
11 Jul Array_
10 Jul Array_
09 Jul Array_
09 Jul Final Feedback 2
09 Jul Implement swagger 3
09 Jul TroubleShooting_Instance connection lost
08 Jul Array_
07 Jul Cover Letter Draft
07 Jul 수열 추측하기
07 Jul 조합, DFS, Memoization
06 Jul 순열, DFS
05 Jul 중복순열, DFS
04 Jul Final Feedback
04 Jul 중복순열, DFS
01 Jul CV draft 1
22 Jun DFS, 부분집합, 최대점수 구하기
21 Jun TroubleShooting_Too many Connections
21 Jun DFS, 부분집합
20 Jun Refactoring_Restful API URI
20 Jun DFS_합이 같은 부분집합
19 Jun What to check in recruit
19 Jun Strengths
19 Jun URN/URI/URL
19 Jun BFS, 인접리스트
18 Jun 그래프, 경로탐색, 인접리스트
17 Jun 그래프, 경로탐색, 인접행렬, DFS
16 Jun 그래프와 인접 행렬
15 Jun BFS_말단 노드까지 최단 거리 구하기
14 Jun GIT 깃 전략
14 Jun DFS_말단 노드까지 최단 거리 구하기
13 Jun Refactoring_UUID to make unique order number
13 Jun Exceptions Handling
13 Jun BFS_상태트리 탐색
12 Jun Mid Feedback
06 Jun AWS EC2 HTTPS
02 Jun BFS
01 Jun Binary Tree_부분집합 만들기
31 May Binary Tree_깊이 우선 탐색 DFS
30 May Recursion, Memoization_피보나치
29 May AWS S3서버 연동하기
29 May Recursion_팩토리얼
28 May Recursion_이진수 출력
27 May Recursion_재귀 함수
26 May 결정 알고리즘, 이분탐색_마구간 배치하기
25 May 결정 알고리즘, 이분탐색_뮤직비디오
24 May Bash script
24 May Binary Serach_이분검색
22 May MashUp
22 May Project Feedback
21 May 1. Project Planning
21 May Class_좌표 정렬
20 May ArraySort_바꾼 자리 확인하기
19 May ArraySort_같은 숫자 있는지 중복 확인하기
18 May 배열 밀기, 반복문 밖 판단하기_Least Recently Used
17 May Insertion sort_오름차순으로 정렬하기
16 May BubbleSort_오름차순으로 정렬하기
15 May Auth_Spring Security_findId, getNewPassword
15 May Selection sort_오름차순으로 정렬하기
14 May Queue_class정의해서 순서 알아내기
13 May Queue_교육과정이 순서대로 설계되었나
12 May Reflection_Movie Reservation project
12 May Queue_마지막 남은 한 사람
09 May Stack_쇠 막대기 자르기
08 May Stack_후위식 연산(postfix)
07 May Stack_크레인 인형뽑기
06 May Stack_괄호 밖 문자만 출력하기
05 May Stack_괄호 문제
04 May TreeSet_k번째 큰 수
03 May (feat) Sort by ticketSales/review
03 May (feat) Only able to add review for movies 1. with reservation 2. watched
03 May Sliding Window, HashMap, Two Pointer_모든 아나그램 찾기
02 May Sliding Window, HashMap, Two Pointer_매출액의 종류
01 May HashMap_Anagram
29 Apr Deploy environment EC2, RDS
29 Apr HashMap_제일 많이 등장한 알파벳 찾기
27 Apr (feat) Get ticket sales
27 Apr (feat) How to get average score
27 Apr (feat) show only with/until N digits
27 Apr (feat) 값이 ~이면 ~로 보여지게 하세요
27 Apr (feat) LocalDate, LocalTime ↔️ LocalDateTime
26 Apr All about List
26 Apr (feat) Date ↔️ LocalDate
26 Apr (fix) only user who registered the reservation/review can update/delete
21 Apr Two Pointer_최대 길이 연속부분수열
20 Apr Math_몫과 나머지 사용해서 연속된 자연수의 합 구하기
19 Apr Two Pointer_연속 부분수열
18 Apr Sliding Window_k개 숫자 최대값 구하기
17 Apr How to bring IntelliJ project to already existing github repository?
17 Apr Two Pointers_교집합 구하기
15 Apr Two Pointers_두 배열 합쳐서 오름차순으로 출력_two pointer
14 Apr JPA_findByCategory/keyword
14 Apr Array_두 학생 중 꾸준히 등수가 높은 학생 구하기
13 Apr Array_같은반이었던 경험이 제일 많은 학생
12 Apr Array_3시, 6시, 9시 12시 방향보다 큰 숫자
11 Apr Array_격자판 합 구하기
10 Apr Redis_email certification
10 Apr Jasypt_encryption
10 Apr Git terminate port
10 Apr Array_등수 계산하기
09 Apr Redis_GitCommands
09 Apr Git clone a repo to another repo
09 Apr Array_점수 계산
08 Apr Array_숫자 뒤집고 소수인지 판별하기
04 Apr Array_소수_Sieve of Eratosthenes
03 Apr Array_피보나치 수열
02 Apr Array_가위바위보해서 이긴사람 출력하기_switch
01 Apr Array_앞에있는 숫자들보다 커?_max
29 Mar Array_큰 수 출력하기
29 Mar String_암호_replace, parseInt, subString
29 Mar String_문자열 압축
27 Mar String_가장 짧은 문자 거리 구하기
26 Mar String_숫자만 추출_parseInt, valueOf
25 Mar String_팰린드롬_replaceAll
24 Mar String_회문문자열_charAt, equalsIgnoreCase, stringBuilder, reverse
23 Mar String_중복문자 제거_arraylist, charAt, indexOf
22 Mar Entity 🆚 Repository 🆚 JPA 🆚 DTO
21 Mar String_특정 문자 뒤집기_ofValue, isAlphabetic
21 Mar String_단어 뒤집기_stringBuffer, ArrayList, toCharArray, String.valueOf
13 Mar String_문장 속 단어_split, subString, indexOf
13 Mar String_대소문자 변환_toCharArray, toUpperCase, ascii
13 Mar String_문자 찾기_charAt, indexOf
01 Feb Auth_Spring Security_signup, login
24 Jan Git push, commit, merge error
22 Jan 스프링 보안코드 환경 변수로 숨기기
22 Jan CORS_XXS, CSRF, SQL injection
19 Jan Spring Security 이론
19 Jan Cookie, Session, JWT
19 Jan Cache, HTTP Cache, E-tag, Spring Cache
18 Jan Test Code
17 Jan JPA mapping, JPQL, N+1, PSL
16 Jan 예외처리, RestController Advice
16 Jan ORM, JPA, Pagination, Dirty Checking
12 Jan Mapstruct Utility Library, Swagger
12 Jan Lombok Utility Library, Logback
12 Jan Logging, LogBack, Slf4j
11 Jan Spring CRUD
09 Jan Spring boot Layer
09 Jan Spring boot architecture, layers, DTO
08 Jan 2024.JAN.08(MON) JAVA DAY 26
08 Jan AOP, PSA, Bean, DI, IoC
08 Jan WAS, Servlet, Filter, Interceptor
08 Jan SPA, SSR, CSR
06 Jan URL/ domain/ Json/ WEB API/ REST
06 Jan Network 구조
05 Jan CISCO_PART9_Router
05 Jan CISCO_PART10_WAN
05 Jan 2024.JAN.05(FRI) JAVA DAY 25
04 Jan 2024.JAN.04(THU) JAVA DAY 24
04 Jan SQL contraints 데이터 무결성
04 Jan DB modeling
04 Jan JDBC
03 Jan 2024.JAN.03(WED) JAVA DAY 23
03 Jan JOIN
03 Jan 가운데 글자 가져오기
02 Jan 2024.JAN.02(TUE) JAVA DAY 22
02 Jan RDB Table 관계
02 Jan 문자열 내 p와 y의 개수
02 Jan 약수의 합
02 Jan 문자열을 정수로 바꾸기
01 Jan 2024.JAN.01(THU) JAVA DAY 21
01 Jan SQL datatype, commands
01 Jan Gradle
01 Jan 나머지가 1이 되는 수 찾기

2023

31 Dec Annotation, Reflection
29 Dec CISCO_PART8_Routing Protocol
29 Dec MultiThread
29 Dec Design Pattern
29 Dec Method Reference
28 Dec 2023.DEC.28(THU) JAVA DAY 19
27 Dec 2023.DEC.27(WED) JAVA DAY 18
27 Dec Input/Output Stream
26 Dec 2023.DEC.26(TUE) JAVA DAY 17
26 Dec Server-client network, Socket, Serializable
26 Dec Stream
26 Dec Lambda
26 Dec Utility Class
25 Dec 2023.DEC.25(MON) JAVA DAY 16
25 Dec Optional
23 Dec CISCO_PART7_Router
22 Dec 2023.DEC.22(FRI) JAVA DAY 15
21 Dec 2023.DEC.21(THU) JAVA DAY 14
21 Dec Try-catch, Exception
20 Dec 2023.DEC.20(WED) JAVA DAY 13
20 Dec Wrapper Class/ Boxing
20 Dec Collection Framework_List(Stack, Queue)
20 Dec Collection Framework_Map/ Set
20 Dec Collection Framework_List
20 Dec Collection Framework_Array, Node
20 Dec Generic
19 Dec 2023.DEC.19(TUE) JAVA DAY 12
18 Dec 2023.DEC.18(MON) JAVA DAY 11
18 Dec Object
17 Dec CISCO_PART6_Switch & VLAN
17 Dec CISCO_PART5_IP주소
17 Dec Math/ String Buffer/ Time
17 Dec Enumeration
17 Dec Java Virtual Machine
17 Dec Java IntelliJ
16 Dec Inner Class, Anonymous Class
15 Dec 2023.DEC.15(FRI) JAVA DAY 10_원, 사각형 넓이, 둘레_abstract
15 Dec Single turn
14 Dec 2023.DEC.14(THU) JAVA DAY 9_원, 사각형 넓이_extends
14 Dec Interface
14 Dec Abstract
13 Dec Polymorphism/ Downcasting/ Instanceof
12 Dec 2023.DEC.13(WED) JAVA DAY8_배열에 학생 점수 저장하고 접근하기_static
12 Dec 2023.DEC.12(TUE) JAVA DAY7_배열에 학생 추가, 삭제, 검색
11 Dec 2023.DEC.11(MON) JAVA DAY6_배열 길이가 2진수인지 확인해 늘리기
10 Dec CISCO_PART4_네트워크 장비(NIC/Hub/Switch/Bridge/Router/Gateway)
10 Dec CISCO_PART3_TCP/IP
10 Dec Static
09 Dec JAVA Program Arguments, Main method, Package, Block, Scope
09 Dec Primitive Type 🆚 Reference Type
09 Dec Extends
09 Dec Class/ Instance/ Object/ this, constructor, getter, setter
09 Dec Class_Access Modifier
08 Dec JAVA 부트캠프 4주차 후기
08 Dec 2023.DEC.08(FRI) JAVA DAY5_별 숫자 늘리고 줄여서 다이아몬드 모양
08 Dec scanner
08 Dec method
07 Dec 2023.DEC.07(THU) JAVA DAY4
07 Dec if/ else/ switch
07 Dec for/ for-each/ while/ do whlie
06 Dec 2023.DEC.06(WED) JAVA DAY3
06 Dec String Method
06 Dec Literal/ Symbolic final(상수)/ NULL
05 Dec 2023.DEC.05(TUE) JAVA DAY2
05 Dec Char/ String
05 Dec Operator
05 Dec Data Type
05 Dec Array
05 Dec Variable
04 Dec Operating System/ thread/ CPU process
04 Dec What does a backend programmer do?
04 Dec 2023.DEC.04(MON) JAVA DAY1
04 Dec JDK_JRE_JVM
03 Dec SOAP, REST
03 Dec Framework 🆚 Library
03 Dec API, Interface
02 Dec 슈퍼코딩 웹개발 부트캠프 3주차 신입연수원 후기
01 Dec CISCO_PART2_네트워크와 케이블, 그리고 친구들
01 Dec CISCO_PART1_네트워크 세상에 들어서며
01 Dec firebase란?
01 Dec 2023.DEC.1(FRI) 슈퍼코딩 부트캠프 신입연수원 Day 15
30 Nov bundler, web framework, SPA, SSR, CSR
30 Nov 2023.SEPT.30(THU) 슈퍼코딩 부트캠프 신입연수원 Day 14
29 Nov Svelte, Vite
29 Nov Local storage, Session Storage, Cookie
29 Nov JWT, AccessToken, RefreshToken
29 Nov 2023.SEPT.29(WED) 슈퍼코딩 부트캠프 신입연수원 Day 13
28 Nov 2023.SEPT.28(TUE) 슈퍼코딩 부트캠프 신입연수원 Day 12
27 Nov 2023.SEPT.27(MON) 슈퍼코딩 부트캠프 신입연수원 Day 11
25 Nov 슈퍼코딩 웹개발 부트캠프 2주차 신입연수원 후기
24 Nov 2023.SEPT.24(FRI) 슈퍼코딩 부트캠프 신입연수원 Day 10
23 Nov What happens when I click on a URL?
23 Nov CS 목차
23 Nov 2023.SEPT.23(THU) 슈퍼코딩 부트캠프 신입연수원 Day 9
23 Nov DBMS/ SQL(RDB)/ NoSQL
23 Nov SQL 문법
22 Nov get answer from backend(FastAPI)
22 Nov Memo App CRUD
22 Nov 2023.SEPT.22(WED) 슈퍼코딩 부트캠프 신입연수원 Day 8
21 Nov object, function, if, for
21 Nov 2023.SEPT.21(TUE) 슈퍼코딩 부트캠프 신입연수원 Day 7
20 Nov 2023.SEPT.20(MON) 슈퍼코딩 부트캠프 신입연수원 Day 6
20 Nov clock, timer, padStart, toString, setInterval, setTimeout, newDate()
19 Nov CarrotMkt Clone Coding_Firebase
19 Nov CarrotMkt Clone Coding_Svelte, Vite
19 Nov CarrotMkt Clone Coding_LogIn
18 Nov 슈퍼코딩 웹개발 부트캠프 1주차 신입연수원 후기
18 Nov CarrotMkt Clone Coding_SignUp(POST, password sha256)
18 Nov CarrotMkt Clone Coding_GET
18 Nov CarrotMkt Clone Coding_POST
18 Nov Path, Query, RequestBody
18 Nov Request Body
17 Nov weakness and how I improved
17 Nov 2023.SEPT.17(FRI) 슈퍼코딩 부트캠프 신입연수원 Day 5
17 Nov Wordle Clone Coding HTML, JS
16 Nov 2023.SEPT.16(THU) 슈퍼코딩 부트캠프 신입연수원 Day 4
15 Nov 2023.SEPT.15(WED) 슈퍼코딩 부트캠프 신입연수원 Day 3
15 Nov transition, transform, animation
14 Nov 2023.SEPT.14(TUE) 슈퍼코딩 부트캠프 신입연수원 Day 2
14 Nov Input Tags in HTML
14 Nov CSS basics
13 Nov 2023.SEPT.13(MON) 슈퍼코딩 부트캠프 신입연수원 Day 1
13 Nov Object, Boolean, Function
13 Nov DOM, IDE
13 Nov Head, Semantic Tags
12 Nov Developing Web
01 Jan Java Acyronyms

1996

03 Jun format

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