If $x$ is a real number and $k$ is a nonnegative integer, recall that the binomial coefficient $\binom{x}{k}$ is defined by the formula
\[
  \binom{x}{k} = \frac{x(x - 1)(x - 2) \dots (x - k + 1)}{k!} \, .
\]
Compute the value of
\[
  \frac{\binom{1/2}{2014} \cdot 4^{2014}}{\binom{4028}{2014}} \, .
\]
1. **Express the binomial coefficient $\binom{1/2}{2014}$ using the given formula:**
   \[
   \binom{\frac{1}{2}}{2014} = \frac{\left(\frac{1}{2}\right)\left(\frac{1}{2} - 1\right)\left(\frac{1}{2} - 2\right) \cdots \left(\frac{1}{2} - 2013\right)}{2014!}
   \]
   Simplifying the numerator:
   \[
   \left(\frac{1}{2}\right)\left(-\frac{1}{2}\right)\left(-\frac{3}{2}\right)\cdots\left(-\frac{4025}{2}\right)
   \]
   This can be rewritten as:
   \[
   \frac{(-1)^{2013} \cdot 1 \cdot 3 \cdot 5 \cdots \cdot 4025}{2^{2014}}
   \]
   Therefore:
   \[
   \binom{\frac{1}{2}}{2014} = \frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025)}{2^{2014} \cdot 2014!}
   \]

2. **Express the binomial coefficient $\binom{4028}{2014}$:**
   \[
   \binom{4028}{2014} = \frac{4028!}{2014! \cdot 2014!}
   \]

3. **Compute the given expression:**
   \[
   \frac{\binom{\frac{1}{2}}{2014} \cdot 4^{2014}}{\binom{4028}{2014}}
   \]
   Substitute the expressions for the binomial coefficients:
   \[
   \frac{\left(\frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025)}{2^{2014} \cdot 2014!}\right) \cdot 4^{2014}}{\frac{4028!}{2014! \cdot 2014!}}
   \]
   Simplify the expression:
   \[
   \frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025) \cdot 4^{2014}}{2^{2014} \cdot 2014! \cdot \frac{4028!}{2014! \cdot 2014!}}
   \]
   \[
   = \frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025) \cdot 4^{2014} \cdot 2014! \cdot 2014!}{2^{2014} \cdot 2014! \cdot 4028!}
   \]
   \[
   = \frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025) \cdot 2^{4028} \cdot 2014!}{2^{2014} \cdot 4028!}
   \]
   \[
   = \frac{(-1)^{2013} \cdot (1 \cdot 3 \cdot 5 \cdots \cdot 4025) \cdot 2^{2014}}{4028!}
   \]

4. **Simplify the factorials and products:**
   Notice that:
   \[
   1 \cdot 3 \cdot 5 \cdots \cdot 4025 = \frac{(2 \cdot 2014)!}{2^{2014} \cdot 2014!}
   \]
   Therefore:
   \[
   \frac{(-1)^{2013} \cdot \frac{(2 \cdot 2014)!}{2^{2014} \cdot 2014!} \cdot 2^{2014}}{4028!}
   \]
   \[
   = \frac{(-1)^{2013} \cdot (2 \cdot 2014)!}{4028! \cdot 2014!}
   \]
   \[
   = \frac{(-1)^{2013}}{4027}
   \]

The final answer is \( \boxed{ -\frac{1}{4027} } \)