Jonghyuck Park

Publications (3)4.42 Total impact

• Article: Analysis of the time dependency of ammonia-oxidizing bacterial community dynamics in an activated sludge bioreactor.

  Jun-Geol Baek, Jonghyuck Park, Taek-Seung Kim, Hee-Deung Park
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  ABSTRACT: An autoregressive error term model was applied to examine the dynamic oscillation of ammonia-oxidizing bacterial (AOB) lineages found in an activated sludge bioreactor. The current abundance of AOB lineages was affected by the past abundance of AOB lineages and past environmental and operational factors as well as current influencing factors.
  Journal of Bioscience and Bioengineering 04/2011; 112(2):166-9. · 1.79 Impact Factor
• Article: Spline regression based feature extraction for semiconductor process fault detection using support vector machine.

  Jonghyuck Park, Ick-Hyun Kwon, Sung-Shick Kim, Jun-Geol Baek
  Expert Syst. Appl. 01/2011; 38:5711-5718.
• Article: Nerve regeneration following spinal cord injury using matrix metalloproteinase-sensitive, hyaluronic acid-based biomimetic hydrogel scaffold containing brain-derived neurotrophic factor.

  Jonghyuck Park, Eunjeong Lim, Seungkeun Back, Heungsik Na, Yongdoo Park, Kyung Sun
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  ABSTRACT: Spinal cord injury leads to the permanent loss of motor and sensory function in the body. To enhance spinal cord regeneration, we used a hyaluronic acid-based hydrogel as a three-dimensional biomimetic scaffold for peptides and growth factors. Three components were used to provide guidance cues: a matrix metalloproteinase peptide crosslinker, an IKVAV (Ile- Lys-Val-Ala-Val) peptide derived from laminin, and brain-derived neurotrophic factor (BDNF). Human mesenchymal stem cells (hMSCs) were cultured in hydrogels in vitro for 10 days to induce neuronal differentiation of hMSCs. Based on gene-expression data, the matrix metalloproteinase-sensitive peptide, IKVAV peptide, and BDNF were critical in the differentiation of hMSCs. Remodeling activity was found to be a key factor in guiding neural differentiation of stem cells. To test this approach in vivo, we used the spinal cord injured rat model and five different hydrogel compositions. Samples were injected into the intrathecal space, and animals were monitored for 6 weeks. Compared to all other groups, animals injected with BDNF-containing hydrogels showed the greatest improvement on locomotive tests (Basso-Beattie-Bresnahan score) during the initial stage after injury. These results suggest that hyaluronic acid-based hydrogels containing IKVAV and BDNF create microenvironments that foster differentiation of stem cells along the neural cell lineage, and they could be used to facilitate nerve regeneration after spinal cord injury.
  Journal of Biomedical Materials Research Part A 09/2009; 93(3):1091-9. · 2.63 Impact Factor