diff --git a/articles/2024/orthodontics.md b/articles/2024/orthodontics.md
new file mode 100644
index 0000000..9600a6a
--- /dev/null
+++ b/articles/2024/orthodontics.md
@@ -0,0 +1,10 @@
+# 正畸
+
+- 校正会改变面下三分之一的外貌
+
+## 流程
+
+- 排齐、整平牙齿，逐渐调整牙齿位置，达到牙列的基本对齐
+- 收缝，关闭牙齿间隙，调整咬合关系，确保上下牙齿的咬合关系良好，间隙没有过大的缝隙，咬合平衡
+- 精调，对牙齿进行更精细的调整，包括微小的旋转、校正和微调，确保每颗牙齿的位置和角度都能达到理想状态
+- 
diff --git a/articles/2024/umi.md b/articles/2024/umi.md
deleted file mode 100644
index 4d8a23e..0000000
--- a/articles/2024/umi.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# [Umi](https://umijs.org/)
-
-[github]()
diff --git a/articles/2024/wechat.md b/articles/2024/wechat.md
deleted file mode 100644
index 8121cf9..0000000
--- a/articles/2024/wechat.md
+++ /dev/null
@@ -1,8 +0,0 @@
-# 微信
-> 网页开发中，很多地方会用到微信，记录一下相关过程
-
-## 扫码关注
-- 先获取一个tick数据，是str
-- 轮询去检查这个str对应的图像被扫码不
-    - 扫码，返回openid，属于关注成功
-    - 为得到openid，重复轮询check
\ No newline at end of file
diff --git a/articles/safe/index.md b/articles/safe/index.md
index a93e4b3..9872d22 100644
--- a/articles/safe/index.md
+++ b/articles/safe/index.md
@@ -4,3 +4,14 @@
 - [计时攻击](/articles/safe/time.attacks.md)
 - [OpenArk：专业的 Windows 恶意程序分析与清理工具。](github.com/BlackINT3/OpenArk)
 - [分析 Go 编译后文件大小的工具](github.com/Zxilly/go-size-analyzer)
+
+## 工具
+
+- [nmap](https://nmap.org/)
+    - [github](https://github.com/nmap/nmap)
+    - [Nmap Project's Windows packet capture and transmission library ](https://github.com/nmap/npcap)
+
+- [TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes. 扫描工具](https://github.com/robertdavidgraham/masscan)
+
+- [tcpdump, a powerful command-line packet analyzer](https://www.tcpdump.org/)
+    - [github](https://github.com/the-tcpdump-group/tcpdump)
diff --git a/cg/font.md b/cg/font.md
index 2820c7e..513eb8b 100644
--- a/cg/font.md
+++ b/cg/font.md
@@ -71,6 +71,12 @@ freetype可以根据ttf等格式的font文件 提取到文字轮廓 然后根据
 
 [FTGL is a free cross-platform Open Source C++ library that uses Freetype2 to simplify rendering fonts in OpenGL applications. FTGL supports bitmaps, pixmaps, texture maps, outlines, polygon mesh, and extruded polygon rendering modes.](https://sourceforge.net/projects/ftgl/)
 
+### [opentype.js](https://opentype.js.org/)
+
+前端渲染字体
+
+- [github](https://github.com/opentypejs/opentype.js/)
+
 ## 参考
 [Web 字体 font-family 该如何设置？](https://zhuanlan.zhihu.com/p/313284552)
 [cmap — Character to Glyph Index Mapping Table](https://learn.microsoft.com/en-us/typography/opentype/spec/cmap#encoding-records-and-encodings)
diff --git a/cg/mesh/bvh.md b/cg/mesh/bvh.md
new file mode 100644
index 0000000..2c480b7
--- /dev/null
+++ b/cg/mesh/bvh.md
@@ -0,0 +1,11 @@
+# Bounding Volume Hierarchy(BVH)
+
+
+## [three-mesh-bvh](https://github.com/gkjohnson/three-mesh-bvh)
+
+### Surface Area Heuristic(SAH)
+
+表面积启发式算法, 是一种用于优化BVH构建过程的策略, 基于复杂度成本分析和概率论，旨在通过最小化遍历BVH时的预期成本来提高查询效率.
+
+SAH算法广泛应用于需要高效碰撞检测、射线相交测试等场景管理技术的领域，
+
diff --git a/cg/shader.md b/cg/shader.md
index f9b86a6..dc5848e 100644
--- a/cg/shader.md
+++ b/cg/shader.md
@@ -138,6 +138,7 @@ mat3(
 - [Layout Qualifier (GLSL)](https://www.khronos.org/opengl/wiki/Layout_Qualifier_(GLSL))
 - [Data Type (GLSL)](https://www.khronos.org/opengl/wiki/Data_Type_(GLSL))
 
+- [shadertop着色器](https://www.shadertoy.com/)
 ### WebGPU
 
 - [gpuweb](https://www.w3.org/community/gpu/)
@@ -145,6 +146,10 @@ mat3(
 - [WebGPU Shading Language](https://gpuweb.github.io/gpuweb/wgsl/)
 - [WebGPU深入探索](http://www.bimant.com/blog/webgpu-deep-dive/)
 
+- [webGPU版compute.toys is an experimental editor for WebGPU compute shaders](https://compute.toys/)
+  - [github](https://github.com/compute-toys/compute.toys)
+  - [Cross-platform compute shader engine](https://github.com/compute-toys/wgpu-compute-toy)
+
 ### [RenderDoc](https://renderdoc.org/)
 
 [RenderDoc在线文档](https://renderdoc.org/docs/index.html)
diff --git a/cg/tools/camera.md b/cg/tools/camera.md
index fdd0f60..3cb3ec0 100644
--- a/cg/tools/camera.md
+++ b/cg/tools/camera.md
@@ -38,8 +38,40 @@ top = right / aspect = tan(theta/2) * near / aspect;
 // https://community.khronos.org/t/fovy-or-zoom-value/24950/2
 sx = (2n * v.x)(f - n) / ((right - left)(-2fn)v.z);
 sy = (2n * v.y)(f - n) / ((top - bottom)(-2fn)v.z);
+// perspective equal <==> orthographi camera
+// persp to ortho
+const distance = persp.position.distanceTo(control.target);
+const halfHeight = tan * distance;
+const halfWidth = halfHeight * persp.aspect;
+ortho.top = halfHeight;
+ortho.bottom = -halfHeight;
+ortho.left = -halfWidth;
+ortho.right = halfWidth;
+ortho.updateProjectionMatrix();
+// ortho to persp
+const frustumHeight = (orhto.top - ortho.bottom) / ortho.zoom;
+const halfHeight = frustumHeight / 2;
+const distance = halfHeight / tan;
+persp.position.copy(orhto.position).normalize().multiplyScalar(distance);
+persp.updateProjectionMatrix();
+// to orhto projection get current viewport width
+
 ```
 
+求当前正交投影下的视图宽度参考three.js src\math\Matrix4.js makeOrthographic
+
+$$
+\begin{cases}
+e_{0} = 2 \times w = 2 \times \frac{1}{right - left} \newline
+e_{12} = - \frac{right + left}{w} 
+\end{cases} \to 
+\begin{cases}
+right - left = \frac{2}{e_{0}} \newline
+e_{12} = - \frac{right + left}{right - left} \to left = right \times \frac{e_{12} + 1}{e_{12} - 1}
+\end{cases} \to right(1 - \frac{e_{12} + 1}{e_{12} - 1}) = \frac{2}{e_{0}} \to right = \frac{-2}{2_{0}} \times \frac{e_{12} - 1}{-2}
+= \frac{1 - e_{12}}{e_{0}} \to left = -\frac{1 + e_{12}}{e_{0}}
+$$
+
 [CombinedCamera的实现](https://github.com/mrdoob/three.js/blob/7f43f4e6ef087cec168fea25bb53591052d5ff12/examples/js/cameras/CombinedCamera.js)
 
 ## 参考
diff --git a/dev-note/index.md b/dev-note/index.md
index c9378d5..b64b9e3 100644
--- a/dev-note/index.md
+++ b/dev-note/index.md
@@ -1,7 +1,6 @@
 # dev-note 
 
 - [nodejs包管理](/web/pkg.md)
-- [git](/dev-note/git.md)
 - [cmake](/dev-note/cmake.md)
 - [linux](/dev-note/linux.md)
 - [powershell](/dev-note/powershell.md)
@@ -17,9 +16,16 @@
 
 - [硬件配置](/dev-note/hardware.md)
 
+## 版本控制
+
+- [git](/dev-note/git.md)
+- [Sourcetree simplifies how you interact with your Git repositories so you can focus on coding](https://www.atlassian.com/software/sourcetree)
 
 ## 其他资源
 
 - [MDN--Documenting web technologies, including CSS, HTML, and JavaScript, since 2005.](https://developer.mozilla.org/en-US/docs/Web)
 - [Google的开发工具,面向开发者的Android](https://developer.android.google.cn/?hl=zh-cn)
 - [远程终端工具Mosh is a remote terminal application that supports intermittent connectivity, allows roaming, and provides speculative local echo and line editing of user keystrokes.](https://github.com/mobile-shell/mosh)
+
+### 工具
+
diff --git a/exercises/book-info.md b/exercises/book-info.md
index 9b79ce2..6065ef4 100644
--- a/exercises/book-info.md
+++ b/exercises/book-info.md
@@ -23,6 +23,21 @@
 - [Charles Chapman Pugh《Real Mathematical Analysis》(实数学分析)](https://book.douban.com/subject/26588474/)
     - 很好的解释了概念或证明的本质，帮助建立直觉
 
+### [Steven H. Strogatz《Nonlinear dynamics and chaos: with applications to physics, biology, chemistry, and engineering》(非线性动力学与混沌)](https://book.douban.com/subject/27049323/)
+
+$$
+\text{如何解微分方程} x^{''} + \frac{1}{2}x^{'} + 5sin(x) = 0 \text{因为非线性，线性方法在这里不起作用，但可以将其分解为一阶方程组}, \newline
+\text{定义新的变量} v= x^{'}, \text{则有}
+\begin{cases}
+x^{'} = v \newline
+v^{'} = -\frac{1}{2}v - 5sinx(x)
+\end{cases}
+$$
+
+然后可以选择一个合适的数值方法来求解这个一阶方程组。如在相空间中绘制轨迹，并了解系统的行为方式，在每个点上，水平方向上存在一个微分，在垂直方向上也存在一个微分，从而在相交处得到了相空间中的积分。在实际应用中，还需要考虑初始值和边界值。
+
+机械练习中是找到解，带入数值验证，其实方程组不仅仅练习题，而是描述变化，运动，时间等的语言，要去理解语言背后的场景。数学的真正美妙处就是学会从全新的角度去看待问题
+
 ## 概率论
 
 - [Ross《a First Course in Probability》]()
diff --git a/exercises/index.md b/exercises/index.md
index 799997f..4142167 100644
--- a/exercises/index.md
+++ b/exercises/index.md
@@ -32,6 +32,7 @@
 - [图形计算器，用meijie.lmj@outlook.com登录的](https://www.desmos.com/calculator?lang=zh-CN)
 - [math is fun](https://www.mathsisfun.com/)
     - [数学乐-中文版](https://www.shuxuele.com/index.html)
+- [前端数学库](http://algebrite.org/)
 
 <details>
 <summary>Geogebra开源在线工具</summary>
diff --git a/index/book-info.md b/index/book-info.md
index 83b96d3..3440c0e 100644
--- a/index/book-info.md
+++ b/index/book-info.md
@@ -7,11 +7,15 @@
 
 ## 公版
 
+- [科学直通车Explore scientific, technical, and medical research on ScienceDirect](https://www.sciencedirect.com/)
+
 - [古登堡计划Project Gutenberg is a library of over 70,000 free eBooks](https://www.gutenberg.org/)
 - [国学导航](http://www.guoxue123.com/)
 - [漢川草廬--一個文史哲愛好者所建立的正體中文古籍網站--繁体-台湾](http://www.漢川草廬.tw/index.php)
 - [中國哲學書電子化計劃](https://ctext.org/zh)
 
+
+
 ## reading
 
 - [vulkan tutorial](https://vulkan-tutorial.com/)
diff --git a/index/medicalScience.md b/index/medicalScience.md
index 2696133..62a4e56 100644
--- a/index/medicalScience.md
+++ b/index/medicalScience.md
@@ -1,10 +1,11 @@
 # 医学
-> medical science
 
+- [医学百科--快速搜索概念](https://www.yixue.com/)
 - [口腔解剖图集](https://www.imaios.com/cn/e-anatomy/4/4)
 - [CT相关](../cg/ct.md)
     - [cornerstonejs](../cg/library/cornerstonejs.md)
 - [微笑美学](../articles/2023/smile.md)
+- [正畸](../articles/2024/orthodontics.md)
 - [Open Health Imaging Foundation](https://ohif.org/)
 
 ## 概念
@@ -73,4 +74,20 @@ I轴向右增大，J轴向右增大，K轴向后增大。除了每个体素的
 - [3DSlicer -- Coordinate systems](https://www.slicer.org/wiki/Coordinate_systems)
 - [VolView is an open source radiological viewer developed for clinical professionals.](https://volview.kitware.com/)
     - [app online](https://volview.kitware.app/)
-    - [github](https://github.com/Kitware/VolView)
\ No newline at end of file
+    - [github](https://github.com/Kitware/VolView)
+   
+### [牙科联盟](http://www.fdiworldental.org/)
+
+- [International Dental Journal--Official Journal of FDI World Dental Federation](https://www.sciencedirect.com/journal/international-dental-journal)
+
+### [美国正畸医师协会Official Journal of the American Association of Orthodontists](https://www.ajodo.org/)
+
+### [中华口腔医学会](https://www.cndent.com/)
+
+- [生理性 曲线的保持和建立——直丝弓还是 Spee 弓](https://www.cndent.com/wp-content/uploads/2019/08/2-8.pdf)
+- [中国口腔医学继续教育杂志](http://www.cndent.com/%e4%b8%ad%e5%9b%bd%e5%8f%a3%e8%85%94%e5%8c%bb%e5%ad%a6%e7%bb%a7%e7%bb%ad%e6%95%99%e8%82%b2%e6%9d%82%e5%bf%97)
+- [全英文版Chinese Journal of Dental Research](http://cjdr.cndent.com/index.html)
+
+### [国际口腔医学杂志--四川大学主办](https://www.gjkqyxzz.cn/CN/1673-5749/home.shtml)
+- [Spee曲线在口腔正畸领域的应用及研究进展](https://www.gjkqyxzz.cn/article/2021/1673-5749/1673-5749-48-1-90.shtml)
+- [Bolton 指数在正畸矫治中的应用分析](https://www.gjkqyxzz.cn/CN/10.3969/j.issn.1673-5749.2009.04.027)
\ No newline at end of file
diff --git a/web/mini.md b/web/mini.md
index f4bcb2d..bc59b6a 100644
--- a/web/mini.md
+++ b/web/mini.md
@@ -31,6 +31,12 @@ rpx（responsive pixel）: 可以根据屏幕宽度进行自适应。规定屏
 ### Skyline
 新增的一个Skyline渲染引擎
 
+### 扫码关注
+- 先获取一个tick数据，是str
+- 轮询去检查这个str对应的图像被扫码不
+    - 扫码，返回openid，属于关注成功
+    - 为得到openid，重复轮询check
+
 ## 支付宝小程序
 
 ## 文档参考