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정정권,윤규호,전인성,김기엽,김현우,권순욱 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.5
The ranula is a form of mucocele which specifically occurs in the floor of the mouth. The ranula is classfied into simple ranula and plunging ranula according to the mechanism of development such as the salivary duct obstruction or the extravasation. Clinically this lesion develops as a slowly enlarging painless, fluctuant mass on one side of the floor of the mouth and the mucosa may have a translucent bluish color. An 8-month-old male infant visited our hospital with the chief complaint of the left submandibular swelling and the mass on the floor of the mouth. We tentatively diagnosed a simple ranula. The marsupialization was performed but the sign and the symptom did not subside, so we took the MRI. By the MRI we diagnosed a plunging ranula and excised the sublingual gland via the intraoral approach. The correct diagnosis is essential for the most effective treatment, which is the excision of the sublingual gland.
섬유모세포의 종류에 따른 불멸화된 구강 각화세포의 삼차원적 배양에 관한 연구
정정권(Jeong-Kwon Cheong),윤규호(Kyu-Ho Yoon),김은철(Eun-Cheol Kim) 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.3
Objective: In organotypic culture of immortalized human oral keratinocytes (IHOK), the change of the growth and differentiation was investigated according to the fibroblast type and the involvement of mitogen-activated protein (MAP) kinase. Materials & Methods: IHOK was cultured three dimensionally with gingival fibroblast (GF), dermal fibroblast (DF) and immortalized gingival fibroblast (IGF). We characterized biologic properties of three dimensionally reconstructed IHOK by histological, immunohistochemical, and Western blot analysis. We also investigated whether MAP kinase pathway was involved in epithelial-mesenchymal interaction by Western blot analysis. Results: The best condition of three dimensionally cultured IHOK was the dermal equivalent consisting of type I collagen and IGF. IGF increased the expression of more proliferating cell nuclear antigen (PCNA), involucrin than GF and DF in response to co-culture with IHOK. Extracellularly regulated kinase (ERK) pathway was activated in organotypic co-culture with IGF. Conclusion: The organotypic co-culture of IHOK with dermal equivalent consisting of type I collagen and IGF resulted in excellent morphologic and immunohistochemical characteristics and involved ERK pathway. The epithelial-mesenchymal interaction was activated according to the fibroblast type.
정정권(Jeong-Kwon Cheong) 대한구강악안면외과학회 2006 대한구강악안면외과학회지 Vol.32 No.2
Objectives: Pericoronitis was the most common indication for mandibular third molar surgery and there are no universally acceptable predictive criteria for pericoronitis occurrence. This study was designed to analyze the correlation of the pericoronitis and the eruption state of the mandibular third molar using panoramic radiographs statistically. Materials and Methods: 218 patients whose chief complaint was the extraction of the mandibular third molar were examined. The presence and absence of pericoronitis, age, sex, position of extraction site, angulation, impaction degree, position to the anterior border of mandibular ramus, distance between distal cementoenamel junction of second molar and mesial cementoenamel junction of the mandibular third molar were assessed. Then the correlation of pericoronitis and the eruption state of the mandibular third molar were analyzed by Student’s t-test and chi-square test. Results: There was no correlation between Pericoronitis and age, sex, position of the mandibular third molar. The angulation(P=0.005), impaction degree(P=0.043), relation with anterior border of mandibular ramus(P=0.003), distance between distal cementoenamel junction of second molar and mesial cementoenamel junction of the mandibular third molar(P〈0.05) were correlated with pericoronitis. Conclusions: The occurrence of the pericoronitis can be predicted by the eruption state of the mandibular third molar such as angulation, impaction degree, relation with anterior border of mandibular ramus, distance between distal cementoenamel junction of second molar and mesial cementoenamel junction of third molar.
Cheong, Hae-Kwan,Ha, Mi-Na,Lee, Jong-Seong,Kwon, Ho-Jang,Ha, Eun-Hee,Hong, Yun-Chul,Choi, Ye-Yong,Jeong, Woo-Chul,Hur, Jong-Il,Lee, Seung-Min,Kim, Eun-Jung,Im, Ho-Sub The Korean Society of Environmental Toxicology 2011 환경독성보건학회지 Vol.26 No.-
Objectives: This study was conducted to examine the relationship between crude oil exposure and physical symptoms among residents participating in clean-up work associated with the Hebei Spirit oil spill, 2007 in Korea. Methods: A total of 288 residents responded to a questionnaire regarding subjective physical symptoms, sociodemographic characteristics and clean-up activities that occurred between two and eight weeks after the accident. Additionally, the urine of 154 of the respondents was analyzed for metabolites of volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) and heavy metals. To compare the urinary levels of exposure biomarkers, the urine of 39 inland residents who were not directly exposed to the oil spill were analyzed. Results: Residents exposed to oil remnants through clean-up work showed associations between physical symptoms and the exposure levels defined in various ways, including days of work, degree of skin contamination, and levels of some urinary exposure biomarkers of VOCs, metabolites and metals, although no major abnormalities in urinary exposure biomarkers were observed. Conclusions: This study provides evidence of a relationship between crude oil exposure and acute human health effects and suggests the need for follow-up to evaluate the exposure status and long-term health effects of clean-up participants.
Jeong Won Kang,Cheong Hoon Kwon,이창하 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
For the geological sequestration of carbon dioxide to prevent global warming, the phase equilibrium data for water and carbon dioxide mixture play an important role in process design and operation. In this work, the nonrandom lattice fluid equation of state with hydrogen bonding (NLF-HB EOS) was applied for the prediction of phase equilibrium of mixtures containing water and carbon dioxide. A new set of pure component parameters for carbon dioxide above critical condition was found and optimum binary interaction parameters were reported to correlate mutual solubility of mixtures. The calculated results were compared with the Peng-Robinson Equation of State with the conventional mixing rule (PR-EOS) and the Wong-Sandler mixing rule (PR-WS-EOS). The calculation results show that NLF-HB EOS can correlate mutual solubility of water+carbon dioxide mixtures with reasonable accuracy within a single theoretical framework.
3D Helical Motion of Capsule Endoscope Microrobot using Electromagnetic Actuation System
Cheong Lee,Hyunchul Choi,Semi Jeong,Donghai Li,Zhen Jin,Gwangjun Go,Kiduk Kwon,Seong Young Ko,Jong-oh Park,Sukho Park 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
We propose a new electromagnetic actuation (EMA) system for a locomotion function of capsule endoscope microrobot. The EMA system consists of 3 pair of Helmholtz coils in x-y-z axis and 1 pair of Maxwell coils in z-axis and the capsule endoscope microrobot has a permanent magnet. Generally, the Helmholtz coils generate a uniform magnetic flux which can align the microrobot to an arbitrary desired direction and make a torque for the rotation of the microrobot. The Maxwell coils generate a uniform gradient magnetic flux which can propel the microrobot to the aligned direction. With the proposed EMA system, the capsule endoscope microrobot can show a precessional motion by the Helmholtz coils and an ascending motion by the z-axis Maxwell coils. By the precessional motion and the ascending motion of the capsule endoscope microrobot, it can push a wall of an esophagus and move inside an esophagus. Through various experiments using a spherical magnet and a glass tube, the feasibility and enhancement of the capsule endoscope microrobot using the proposed EMA system can be verified.