文章

OpenSSH的安装与配置

hacking skills
介绍如何安装和配置OpenSSH。
2023-01-11
zenggyu

常见操作对文件和目录时间戳的影响

hacking skills
介绍常见操作对文件和目录时间戳的影响。
2022-06-04
zenggyu

在宿主机中使用虚拟机的VPN连接

计算机技术
介绍如何在宿主机中使用虚拟机的VPN连接。
2022-05-04
zenggyu

指数加权移动均值的计算方法及代码实现

数学与统计学
计算机技术
本文主要介绍了一种指数加权移动均值的计算方法，并给出了一些计算示例。另外，本文还提供了所述算法的SQL和R语言代码实现。
2022-02-09
zenggyu

SQL递归查询的R语言实现

计算机技术
介绍如何用R语言实现SQL的递归查询。
2021-03-20
zenggyu

敏捷开发基本概念和知识：产品待办事项

项目经历
介绍关于产品待办事项的一些基本知识
2020-12-12
zenggyu

敏捷开发基本概念和知识：产品路线图

项目经历
介绍关于产品路线图的一些基本知识。
2020-11-28
zenggyu

敏捷开发基本概念和知识：产品愿景和产品战略

项目经历
介绍关于产品愿景和产品战略的一些基本知识。
2020-11-13
zenggyu

数据模型设计步骤：物理模型

数学与统计学
介绍关系数据库物理模型的设计步骤
2020-10-04
zenggyu

数据模型设计步骤：逻辑模型

数学与统计学
介绍关系数据库逻辑模型的设计步骤
2020-09-27
zenggyu

数据模型设计步骤：概念模型

数学与统计学
介绍关系数据库概念模型的设计步骤。
2020-09-18
zenggyu

SQL递归查询方法简介及示例

计算机技术
介绍SQL递归查询的写法，并提供一些例子。
2020-08-30
zenggyu

数据库基本范式的实现条件及方法

数学与统计学
本文介绍了数据库几个基本范式的实现条件；并且，还通过一个具体的例子讲解了对一个非规范化表进行改造、使之满足各个基本范式的过程。
2020-07-12
zenggyu

Gitea的部署、备份及恢复

计算机技术
介绍如何部署Gitea，并对服务数据进行备份和恢复。
2020-06-24
zenggyu

使用回归模型实现时间序列多步预测的几种策略

数学与统计学
介绍如何使用传统机器学习算法实现时间序列多步预测。
2020-05-14
zenggyu

一些自定义R语言函数

数学与统计学
列出一些常用的自定义函数。
2020-02-26
zenggyu

SQL中ON和WHERE的区别及使用建议

计算机技术
介绍SQL中ON和WHERE的区别，并提供使用建议。
2020-02-07
zenggyu

目标编码简介

数学与统计学
介绍机器学习中一种有效的特征编码方式。
2020-01-01
zenggyu

CSV文件的格式规范及其在常见软件中的导入导出方法

计算机技术
介绍CSV文件格式的规范，以及如何在常用软件中导入和导出该类文件。
2019-12-04
zenggyu

层次分析法及其应用案例

数学与统计学
介绍层次分析法的一个案例，并提供R语言实现。
2019-11-10
zenggyu

Linux用户管理操作

计算机技术
介绍常用的Linux用户管理操作。
2019-11-08
zenggyu

如何使用熵权法计算指标权重

数学与统计学
介绍熵权法的计算方式，并提供R语言实现。
2019-10-28
zenggyu

宽带客户流失预警模型常用特征研究综述

电信业务
介绍宽带客户流失预警模型的有用特征。
2019-08-17
zenggyu

跨年

香港游记。
2019-01-01
zenggyu

歌单

音乐
我喜爱的歌曲及演唱者。
2018-09-09
zenggyu

Git的基本配置

计算机技术
本文首先介绍了实现Git配置的几种形式（包括全局配置、本地配置和临时配置），然后针对日常使用中涉及到的多项重要配置的意义和配置方法分别进行了讲解。
2018-08-27
zenggyu

消失的古城

黑山头古城游记。
2018-06-28
zenggyu

山路上的螃蟹

衡山游记。
2018-06-08
zenggyu

基于CART算法的回归树简介

maths & statistics
介绍基于CART的回归树的基本原理。
2018-04-09
zenggyu
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A Brief Introduction to Various Correlation Coefficients and When to Use Which

maths & statistics
Explains various correlation coefficients.
2019-06-11
zenggyu

Setting up SSH to Manage Connections to Multiple Hosts

hacking skills
Guidance on managing SSH connections.
2019-03-31
zenggyu

Openfortivpn: an Open Source Alternative to Fortinet’s SSLVPN Client

hacking skills
Guidance on installing and using Openfortivpn.
2019-03-27
zenggyu

How to Plot ROC and Precision-Recall Curves

maths & statistics
Explains how to plot ROC and precision-recall curves.
2019-03-03
zenggyu

Deploying a Quarto Website with GitLab Pages

hacking skills
Guidance on how to deploy a personal website.
2019-02-08
zenggyu

Beyond RetinaNet and Mask R-CNN: Single-shot Instance Segmentation with RetinaMask

maths & statistics
Explains retinamask, a novel network architecture for instance segmentation.
2019-01-07
zenggyu

Switching Between Tidyverse and Pandas for Tabular Data Wrangling: Merging and Splitting Data

hacking skills
Tidyverse and pandas alternatives for common data merging and splitting operations.
2019-01-03
zenggyu

Switching Between Tidyverse and Pandas for Tabular Data Wrangling: Tidying Data

hacking skills
Tidyverse and pandas alternatives for common data tidying operations.
2019-01-02
zenggyu

Switching Between Tidyverse and Pandas for Tabular Data Wrangling: Transforming Data

hacking skills
Tidyverse and pandas alternatives for common data transforming operations.
2018-12-29
zenggyu

Switching Between Tidyverse and Pandas for Tabular Data Wrangling: Importing Data

hacking skills
Tidyverse and pandas alternatives for common data importing operations.
2018-12-27
zenggyu

An Introduction to Evaluation Metrics for Object Detection

maths & statistics
Explains various evaluation metrics for object detection.
2018-12-16
zenggyu

RetinaNet Explained and Demystified

maths & statistics
Explains retinanet, a novel network architecture for object detection.
2018-12-05
zenggyu

An Overview of Indexing Methods for Numpy Arrays

hacking skills
Explains various indexing methods for numpy arrays.
2018-11-22
zenggyu

Setting up Connections Between R and Databases

hacking skills
Guidance on how connecting R to databases.
2018-11-18
zenggyu

Using Miniconda to Set up an Environment for Data Science

hacking skills
Guidance on how to install and set up a miniconda environment, with a special focus on data science.
2018-11-08
zenggyu

Setting Up Zotero

hacking skills
Guidance on setting up a fresh zotero installation.
2018-10-05
zenggyu

Git References in a Nutshell

hacking skills
A brief introduction to git references.
2018-09-12
zenggyu

Git Objects in a Nutshell

hacking skills
A brief introduction to git objects.
2018-09-06
zenggyu

The Usage of ANSI C Escape Sequences in Various Programing Languages

hacking skills
Explains and compares the usage of escape sequences in various programming languages.
2018-09-04
zenggyu

Setting up Datagrip

hacking skills
Guidance on setting up a fresh datagrip installation.
2018-08-29
zenggyu

Getting to Know a Database Continued: a Showcase of Some Custom Functions

hacking skills
A follow-up post on getting to know a database.
2018-08-22
zenggyu

A Comparison of Different Ways to Define and Return Outputs From PL/pgSQL Functions

hacking skills
Compare the differences among different ways of defining and returning PL/pgSQL function outputs.
2018-08-12
zenggyu

Getting to Know a Database: Using SQL-Compliant Methods to Retrieve Various Information

hacking skills
Shows how to use the information schema to get useful information of various database objects.
2018-08-11
zenggyu

Creating User-Defined Functions in PostgreSQL

hacking skills
Shows how to create user-defined functions in a PostgreSQL database.
2018-08-04
zenggyu

Setting Up Visual Studio Code

hacking skills
Guidance on setting up a fresh visual studio code installation.
2018-07-08
zenggyu

Multivariate Adaptive Regression Splines in a Nutshell

maths & statistics
A gentle introduction to multivariate adaptive regression splines.
2018-06-16
zenggyu

The Limitation of Accuracy of Classification Models

maths & statistics
Explains why the accuracy of predictions provided by a classification can be low, even if it can perfectly estimate the probability of an outcome.
2018-06-07
zenggyu

A Brief Introduction to Bagged Trees, Random Forest and Their Applications in R

maths & statistics
Explains bagged trees and random forest in a nutshell.
2018-06-05
zenggyu

Setting Up PostgreSQL

hacking skills
Guidance on setting up a fresh PostgreSQL installation.
2018-06-03
zenggyu

Setting Up R

hacking skills
Guidance on setting up a fresh R installation.
2018-06-02
zenggyu

Setting Up Ubuntu

hacking skills
Guidance on setting up a fresh Ubuntu installation.
2018-06-01
zenggyu

Fitting and Interpreting CART Classification Trees

hacking skills
Shows how to fit and interpret a CART classification tree model.
2018-05-31
zenggyu

How to Simulate Data Based on The Assumptions of Logistic Regression

maths & statistics
Shows how to make simulated data for logistic regression.
2018-05-22
zenggyu

CART Classification Tree in A Nutshell

maths & statistics
Explains the CART algorithm for classification problems.
2018-05-15
zenggyu

Fitting and Interpreting CART Regression Trees

hacking skills
Shows how to fit and interpret a CART regression tree model.
2018-04-27
zenggyu

Understanding the Bias-Variance Decomposition with A Simulated Experiment

maths & statistics
Explains bias-variance decomposition with simulation.
2018-03-11
zenggyu

Continuous Archiving and Point-in-Time Recovery with PostgreSQL

hacking skills
Guidance on using continuous archiving and point-in-time recovery with PostgreSQL.
2018-02-12
zenggyu

Installing R, R packages (e.g., tidyverse) and Rstudio on Ubuntu Linux

hacking skills
Guidance on installing R and related software.
2018-01-29
zenggyu
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