Min Young Jung

Hallym University Medical Center, Sŏul, Seoul, South Korea

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Publications (12)7.9 Total impact

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    ABSTRACT: Here, we report a simple heat-treatment process to prepare hydroxyapatite (HA)-coated Ti6Al4V anterior cruciate ligament (ACL) anchor that has good hard tissue compatibility and biostability. Heat treatment was carried out for 1.5 h at temperature range of 700–900 °C. Morphological characterization showed rougher surface and larger pore spaces as the heat treatment temperature was increased. The Ti6Al4V heat-treated at 800 °C had the highest diffused titanium phosphide formation, thus making it high in biocompatibility. For in vivo test, the most bone integration ability was obtained for heat-treatment at 800 and 900 °C. Furthermore, the HA/Ti6Al4V ACL anchor heat-treated at 800 °C had the highest amount of new bone formation. The present results suggest that an implant with complex shape like an ACL anchor could be prepared and used with an easy and low-cost technique by simple heat treatment surface modification method after dip-coating with HA.
    No preview · Article · Sep 2012 · Ceramics International
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    ABSTRACT: A healthy 34-year-old man was admitted to the intensive care unit through the emergency room with a drowsy mentality and severe chilling. Following a diagnosis of septic shock of unknown origin, the patient was treated with broad spectrum antibiotics and massive hydration. After recovery of consciousness, he complained of a severe toothache that originated from the right lower teeth. Under dental consultation, he was diagnosed as having an acute periapical abscess of the right mandibular first molar. The patient underwent extraction and cyst enucleation. Gram negative bacilli isolated from blood culture on day 5 after admission were identified as Prevotella species. After receiving antibiotic treatment and undergoing dental procedures, the patient made a full recovery. We report on a case of septic shock due to infection by Prevotella species in association with an acute periapical abscess.
    Preview · Article · Apr 2012
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    ABSTRACT: Although the adrenal gland is a common site of metastasis from hepatocellular carcinoma (HCC), adrenal metastases are rarely seen in clinical practice because of its lower metastatic potential compared to the other malignancies. Adrenal metastases usually were detected at the time of diagnosis of primary HCC or simultaneously with intrahepatic recurrence after curative management of HCC. It is very rare that only metastatic HCC is detected without evidence of intrahepatic recurrence. Hereby, we report two cases of adrenal metastasis from HCC without intrahepatic recurrence after hepatic resection.
    Preview · Article · Apr 2012 · The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi
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    ABSTRACT: The tumor-node-metastasis (TNM) staging is an useful system to assess the prognosis of any solid cancer. As new TNM staging classification of 7th stomach cancer was revised in 2009, we evaluated the prognostic predictability of the 7th International Union Against Cancer/American Joint Committee on Cancer (UICC/AJCC) TNM classification compared to 6th UICC/AJCC TNM classification in gastric cancer. From January 2000 to December 2009, 5-year survival rates of 266 patients with gastric cancer were calculated by the 6th and 7th UICC/AJCC TNM classification. Using the 7th UICC/AJCC TNM classification, there was no significant difference in the 5-year cumulative survival rates (5 YSR) between stage IIA and IIB, IIB and IIIA, and IIIA and IIIB (70% vs. 71%, p=0.530; 71% vs. 80%, p=0.703; 80% vs. 75%, p=0.576, respectively) though significant differences of the survival rates were observed among stages of 6th edition. Using T stage of 7th edition, 5 YSR was not different between T2 and T3 (86% vs. 82%, p=0.655). Using N stage of 7th edition, 5 YSR were not different between N1 and N2, N3a and N3b (79% vs. 81%, p=0.506; 41% vs. 17%, p=0.895, respectively). The 7th UICC/AJCC TNM classification had poor prognostic predictability in gastric cancer compared to the 6th edition.
    Preview · Article · Nov 2011 · The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi
  • Leonard D Tijing · Min Young Jung · Dong-Won Kim · Cheol Sang Kim
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    ABSTRACT: This paper presents an investigation on the deposition behavior of self-assembled monolayers (SAMs) and bacteria on titanium and gold surfaces using an electrochemical quartz crystal nanobalance (EQCN). The tests included alkanethiol and alkanesilane and three bacteria, namely: E. coli, P. fluorescens and K. aerogenes. The mass change with respect to immersion time was measured by EQCN. The results showed SAM formation on both titanium and gold surfaces, but SAM formation on gold was generally higher by 26-74% as compared to that of titanium. On the other hand, bacteria also adhered well on the two metal surfaces. E. coli and P. fluorescens had high affinity on gold and titanium surfaces, respectively, while K. aerogenes was more adherent to titanium. The results showed that titanium and gold are good metals for biomaterials yet at the same time, their bioinert property provide excellent condition for bacterial adhesion. Therefore, there is a need for proper surface preparation to optimize the use of titanium and gold as biomaterials.
    No preview · Article · Feb 2011 · Journal of Nanoscience and Nanotechnology
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    ABSTRACT: This paper presents a new artificial muscle actuator produced from dielectric elastomer, called Tube-Spring Actuator(TSA). The new actuator construction includes two steps: the first part is a cylindrical actuator manufactured with dielectric elastomer and the second is a compressed spring inserted inside the tube. An inner spring is used to maximize the axial deformation while constraining the radial one. This unique design enables linear actuation with the largest strain of active length up to 14% without any additional means. As a result this actuator was applied to a robot hand. This study lays the foundation for the future work on dielectric polymer actuator.
    Full-text · Article · Mar 2006 · Proceedings of SPIE - The International Society for Optical Engineering
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    ABSTRACT: This paper presents a new artificial muscle actuator produced from dielectric elastomer, called Tube-Spring Actuator(TSA). The new actuator construction includes two steps: the first part is a cylindrical actuator manufactured with dielectric elastomer and the second is a compressed spring inserted inside the tube. An inner spring is used to maximize the axial deformation while constraining the radial one. This unique design enables linear actuation with the largest strain of active length up to 14% without any additional means. As a result this actuator was applied to a robot hand. This study lays the foundation for the future work on dielectric polymer actuator.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
    No preview · Article · Mar 2006
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    ABSTRACT: One of the major characteristics of living microorganisms is their behavior in deposition upon material surfaces. The initial biofouling behavior was investigated by measuring the mass of bacteria deposited on various metallic surfaces immersed in stationary distilled water. Three different bacteria were used: Pseudomonas fluorescens, Escherichia coli, and Klebsiella aerogenes, all of which commonly exist in industrial water systems. The present results show that R fluorescens was most adherent to a Ti surface, while E. coli and K. aerogenes were affinitive to Au and Al, respectively. Generally, Au and Ti metals showed high bacterial deposition behavior. The bacteria deposited on the Ti surface could be effectively removed by irradiation of ultra-violet light. (c) 2005 Elsevier Ltd. All rights reserved.
    No preview · Article · Jan 2006 · International Communications in Heat and Mass Transfer
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    ABSTRACT: Many publications have demonstrated advantages of smart polymer actuators over the traditional electromagnetic transducers. One of the most significant contributions of the polymers might be their soft actuation mechanism. Hence unlike the traditional actuators, there is morphological freedom for actuator construction that benefits production of either small scale complex mechanisms or human-like applications. Although many different actuation paradigms of polymer actuators presented in previous publications, no significant contributions are made for the actual industrial applications. A noble idea for acquiring controllable actuation is antagonistic drive mechanism of dielectric elastomer. The mechanism provides fairly accurate controllable motion and relatively large actuation forces. A strong dependency to pre-strain of the polymer is however one of the major constraints of the actuator driving mechanism. A detailed characterization of pre-strain effects should be done for the successful construction of the actuators. Hence an experimental and theoretical consideration about mutual effects of pre-strain and actuator performance is to be presented in the present work.
    No preview · Article · Jan 2006 · Key Engineering Materials

  • No preview · Article · Jan 2006 · Key Engineering Materials
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    ABSTRACT: As ElectroActive Polymers (EAPs) attract keen attentions from various engineering fields, they have been proven more beneficial over the traditional electromagnetic transducers. In the present paper, a new polymeric material that could be adopted for a dielectric elastomer actuator is introduced. The proposed synthetic rubber produces larger deformation at higher energy efficiency compared to previously known dielectric elastomers. A method for the material synthesis and a set of comparative testing of the material to the existing material are to be mentioned in the present work. In addition, benefits of actuators made with the proposed material are discussed.
    No preview · Article · Jan 2006 · Key Engineering Materials
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    ABSTRACT: Smart polymer based actuators have demonstrated various benefits over the traditional electromagnetic or piezoelectric-material actuators. One of the most significant contributions of the polymers is its soft actuation mechanisms. Hence morphological freedom for actuator construction benefits production of either small scale complex mechanisms or human-like applications. Although many actuation paradigms of polymer actuators are presented in various publications, no significant contributions are made for investigation of modeling and control methods of the material. In the present work, a smart polymer based actuator is constructed. It is then modeled and analyzed for feasible control scheme selection.
    No preview · Article · Jan 2005 · Key Engineering Materials

Publication Stats

21 Citations
7.90 Total Impact Points

Institutions

  • 2012
    • Hallym University Medical Center
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2006-2012
    • Chonbuk National University
      • • Department of Mechanical Design Engineering
      • • Department of Mechanical System Engineering
      Tsiuentcheou, North Jeolla, South Korea
  • 2005-2006
    • Sungkyunkwan University
      • School of Mechanical Engineering
      Sŏul, Seoul, South Korea