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비강 및 부비동 종양에서의 p53, p21, Cyclin D1, Ki-67 발현
정하민,윤기중,이재훈 대한비과학회 2008 Journal of rhinology Vol.15 No.2
Background and Objectives:The goal of this study is to investigate alterations of cell-cycle-related molecules, including p53, p21, cyclin D1 and Ki-67, in tumors arising in the sinonasal region. Materials and Methods:The study materials were 16 specimens of normal nasal mucosa, 16 inverted papillomas (IPs) and 12 sinonasal squamous cell carcinomas. The p53, p21, cyclin D1 and Ki-67 expression was assessed by immunohistochemical staining. Result:IP and squamous cell carcinoma showed significant increase in the expression of p53, cyclin D1 and Ki-67 than normal mucosa. The expression of p53, cyclin D1 and Ki-67 of the carcinoma was stronger than the IP. But, the p21 expression was not associated with the IP and carcinoma. Conclusion:Increased levels of p53, cyclin D1 and Ki-67 expression correlate with increased cell proliferation in the tumors of sinonasal regions. These findings indicate that p53, cyclin D1 and Ki-67 expression may be useful markers for the dysregulations of cell kinetics in the tumors of sinonasal region. Background and Objectives:The goal of this study is to investigate alterations of cell-cycle-related molecules, including p53, p21, cyclin D1 and Ki-67, in tumors arising in the sinonasal region. Materials and Methods:The study materials were 16 specimens of normal nasal mucosa, 16 inverted papillomas (IPs) and 12 sinonasal squamous cell carcinomas. The p53, p21, cyclin D1 and Ki-67 expression was assessed by immunohistochemical staining. Result:IP and squamous cell carcinoma showed significant increase in the expression of p53, cyclin D1 and Ki-67 than normal mucosa. The expression of p53, cyclin D1 and Ki-67 of the carcinoma was stronger than the IP. But, the p21 expression was not associated with the IP and carcinoma. Conclusion:Increased levels of p53, cyclin D1 and Ki-67 expression correlate with increased cell proliferation in the tumors of sinonasal regions. These findings indicate that p53, cyclin D1 and Ki-67 expression may be useful markers for the dysregulations of cell kinetics in the tumors of sinonasal region.
비용 및 부비동염을 동반한 당뇨병 환자에서 발생한 안구주위 괴사성 근막염 1예
정하민,전경호,이상헌,이재훈 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.3
Necrotizing fasciitis is a soft tissue infection characterized by necrosis of fascia and subcutaneous tissue. It rarely occurs in the craniocervical area but when it does, it can be fatal. Early recognition and prompt intervention are important in minimizing morbidity and mortality rates. We report on a diabetes mellitus patient with periorbital necrotizing fasciitis, which was treated with a combination of intravenous antibiotics and debridement of necrotic tissue and meticulous local wound management. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(3):194-7
Visual Cooperation Based on LOS for Self-organization of Swarm Robots
정하민,김연균,김동헌 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.1
In this study, an attempt has been made to incorporate visual cooperation among decentralized swarm robots for self-organization. Self-organization based on color recognition is presented to overcome the constraints faced in conventional self-organization based on centralized control, in which an external ceiling camera or beacon systems are used. In the proposed scheme, a singular association rule is introduced: a swarm robot considers line-of-sight (LOS) visual information only about its reference robot or a moving target. In particular, this paper presents the following set of cases pertaining to self-organization of swarm robots: 1) a case in which a robot loses a moving target from its LOS, 2) a case in which a robot loses a reference robot from its LOS, 3) a case in which a robot is lost, and 4) a case in which all robots lose the target from their LOS. Results of a simulation and an experiment on prey pursuit show that the proposed self-organization method can be effectively used for multiple mobile robots, despite the use of a simple association rule.
Potential-Function-based Shape Formation in Swarm Simulation
정하민,김동헌 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.2
This paper presents a potential-function-based formation shape control scheme for swarm simulation. The potential function is designed to avoid collision among agents, approach a destination, and achieve a certain shape formation around the destination. The agents move in a swarm to the for-mation position, which is generated from a reference point and the neighboring agents. In the frame-work, a local minimum case created by combining the potential repulsed from neighboring robots and that attracted from a reference point is presented; herein, a robot escapes from a local minimum using a virtual escape point after recognizing the trapped situation. Similarly, in the proposed framework, for a well-equipped formation shape, potential functions are designed to maintain the same relative distance between neighboring robots on a formation line, which also satisfies scalability for the number of agents. The simulation results show that the proposed approach can effectively construct elliptical, diamond, and heart-shaped formations for swarm agents.
전단연결재에 의한 합성률을 고려한 강합성 보의 거동특성 평가
정하민 ( Chung Ha Min ),정치영 ( Jung Chi Young ),안진희 ( Ahn Jin Hee ),김상효 ( Kim Sang Hyo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In this study composite beam which is connected by stud shear connector analyze the behavior according to the degree of shear connection through composite beam experiment and three dimensional finite element analysis. Specimens have same compact section prescribed in EUROCODE4, and have difference with the degree of shear connection by arranging various stud dimensions to have full shear connection and partial interaction From the experiment and FEA results, evaluating the load carrying capacity and ultimate strength of composite beam when specimens behave full shear connection or partial interaction.