Antigravity Agent
f8b21af4be
10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
144 lines
4.5 KiB
Markdown
144 lines
4.5 KiB
Markdown
---
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id: wiki-2026-0508-neuromuscular-control
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title: Neuromuscular Control
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [신경근 조절, Motor Control, NMS Control]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [neuroscience, biomechanics, motor-control, robotics, biomedical]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: python
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framework: opensim
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---
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# Neuromuscular Control
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## 매 한 줄
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> **"매 brain plans, spine reflexes, muscle executes"**. Neuromuscular control 은 CNS 가 motor neuron 을 통해 muscle 활성화를 조절해 movement 를 produce 하는 hierarchical process. 2026 perspective 에서 EMG-driven simulation, exoskeleton control, BCI prosthetics 의 핵심.
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## 매 핵심
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### 매 hierarchy
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- **Cortex (M1, PMC, SMA)**: motor planning.
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- **Cerebellum**: timing, coordination, error correction.
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- **Basal ganglia**: action selection, gain modulation.
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- **Spinal cord**: reflex circuits, central pattern generators (CPG).
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- **Motor unit**: α-MN + muscle fibers (final common pathway).
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### 매 control principles
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- **Size principle (Henneman)**: small MN 먼저, large 나중.
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- **Co-contraction**: agonist + antagonist 동시 활성화 → stiffness 조절.
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- **Stretch reflex**: muscle spindle Ia → α-MN monosynaptic.
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- **Equilibrium point hypothesis**: descending command = desired length.
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### 매 응용
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1. Prosthetic / exoskeleton control.
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2. Rehabilitation robotics.
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3. Surgical motor mapping.
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4. Sport biomechanics.
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## 💻 패턴
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### Hill-type muscle model
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```python
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import numpy as np
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def hill_muscle(activation, length, velocity,
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F_max=1000, l_opt=0.1, v_max=10):
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f_l = np.exp(-((length - l_opt) / (0.5 * l_opt))**2)
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if velocity <= 0:
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f_v = (v_max + velocity) / (v_max - 4 * velocity)
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else:
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f_v = (1.8 - 0.8 * (v_max + velocity) / (v_max - 7.56 * velocity))
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return F_max * activation * f_l * f_v
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```
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### Motor unit recruitment (size principle)
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```python
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def recruit(excitation, n_units=100, threshold_max=1.0):
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thresholds = np.linspace(0.05, threshold_max, n_units)
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return np.where(excitation > thresholds,
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(excitation - thresholds) / (1 - thresholds), 0)
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```
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### EMG → activation mapping
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```python
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from scipy.signal import butter, filtfilt
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def emg_to_activation(emg_raw, fs=1000):
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b, a = butter(4, [20, 450], btype="band", fs=fs)
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emg = filtfilt(b, a, emg_raw)
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emg = np.abs(emg)
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b, a = butter(4, 6, btype="low", fs=fs)
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env = filtfilt(b, a, emg)
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return env / env.max()
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```
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### Inverse dynamics (joint torque)
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```python
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def inverse_dynamics(theta, theta_dot, theta_ddot, m=5, l=0.4, g=9.81):
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I = m * l**2 / 3
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return I * theta_ddot + 0.5 * m * g * l * np.sin(theta)
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```
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### CPG (Matsuoka oscillator)
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```python
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def matsuoka_step(x1, x2, v1, v2, u=1.0, beta=2.5, tau=0.1, dt=0.001):
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y1, y2 = max(0, x1), max(0, x2)
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dx1 = (-x1 - beta*v1 - 2.0*y2 + u) / tau
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dx2 = (-x2 - beta*v2 - 2.0*y1 + u) / tau
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dv1 = (-v1 + y1) / (tau * 12)
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dv2 = (-v2 + y2) / (tau * 12)
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return x1 + dx1*dt, x2 + dx2*dt, v1 + dv1*dt, v2 + dv2*dt
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```
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### EMG-driven prosthetic control
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```python
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class MyoelectricController:
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def __init__(self, n_channels=8):
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self.classifier = train_lda()
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def predict(self, emg_window):
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feat = extract_features(emg_window) # MAV, ZC, WL, AR4
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return self.classifier.predict(feat)
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```
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## 매 결정 기준
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| 상황 | Approach |
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| Whole-body simulation | OpenSim / MyoSuite |
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| Single joint, real-time | Hill-type + LDA EMG |
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| Locomotion robot | CPG + reflexes |
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| Pathology study | Inverse dynamics + EMG |
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**기본값**: Hill-type muscle + size-principle recruitment + EMG envelope.
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## 🔗 Graph
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- 변형: [[Perceptual-Motor-Skills]]
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- Adjacent: [[Reinforcement Learning]] · [[BCI]]
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## 🤖 LLM 활용
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**언제**: simulation parameter tuning, EMG feature engineering, paper synthesis.
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**언제 X**: clinical motor diagnosis — neurologist 필수.
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## ❌ 안티패턴
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- **Linear EMG-force assumption**: 매 force 는 nonlinear (length × velocity × activation).
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- **Ignoring co-contraction**: stiffness control 무시 → unstable model.
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- **Pure feedback control**: feed-forward (internal model) 누락 → laggy.
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## 🧪 검증 / 중복
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- Verified (Zajac 1989, Delp OpenSim 2018, Henneman 1965).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — Hill model + EMG + CPG 패턴 |
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