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예기치 못한 후두 입구 협착으로 인한 환기 부전 상황에서의 비디오 후두경의 유용성 1예
문정환,이선홍,강봉진,Moon, Jeong Hwan,Lee, Sun Hong,Kang, Bong Jin 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.2
Although many factors associated with difficult intubation have been known, predictors of difficult mask ventilation are not well known. We experienced a case of nearly complete airway obstruction following usual anesthetic induction which needed various emergency treatments. The patient had a preoperative diagnosis of contact granuloma of right posterior vocal cord and bilateral vocal cord palsy but later was found out as invasive laryngeal cancer. Upon the surgical field of view, both vocal cords were showing significantly thickened and fixated appearance and was considered as in the critical narrowing state with the potential of complete obstruction. Using $C-MAC^{(R)}$ video laryngoscope we were able to see the narrowed vocal cord and choose proper size of endo-tracheal tube. Consequently, intubation was successfully done and operation was conducted. From this case, we have lessons that physicians should examine the patient's airway more carefully in case of laryngeal mass and prepare emergency measures.
문정환,이상준,정필상,Moon, Jeong Hwan,Lee, Sang Joon,Chung, Phil-Sang 대한후두음성언어의학회 2013 대한후두음성언어의학회지 Vol.24 No.1
Laser laryngeal microsurgery is currently the primary method of treatment of various laryngeal diseases. The development of laryngeal microsurgery came from the introduction of a small spot $CO_2$ laser micromanipulator and more precise microlaryngeal instruments. $CO_2$ laser laryngeal microsurgery has enabled very precise surgery because it has small focus size and hemostatic effect. There are some limitations to the use of the $CO_2$ Laser such as adjacent tissue damage and vocal fold scarring. These problems can be minimized through understanding the mechanisms by which lasers function and correctly manipulating the parameters under a surgeon's control. We should also recognize the safety of $CO_2$ laser for the surgeon to precisely perform the procedure.
문정환,손영익,Moon, Jeong-Hwan,Son, Young-Ik 대한후두음성언어의학회 2011 대한후두음성언어의학회지 Vol.22 No.1
Laryngeal framework surgery comprises medialization laryngoplasty and arytenoid adduction. Since their introduction in the 1970s, these procedures have become standard treatments for vocal fold paralysis and glottal incompetence. However, frequency of laryngeal framework surgery is conjectured to relatively decrease along with the introduction of injection laryngoplasty. In this manuscript, indications for laryngeal framework surgery were highlighted in contrast to those of injection laryngoplasty. The authors introduced the basic concepts and principles as well as surgical techniques of laryngeal framework surgery. Even though the incidence of major and/or minor complications after laryngeal framework surgery is not high, surgeons should be well aware of its possible complications and they should be familiar with tips and know-how to avoid or cope with complications.
GUI기법을 이용한 Load Flow 교육용 시뮬레이터 개발
문정환(Jeong-Hwan Moon),김영용(Young-Yong Kim),장세환(Se-Hwan Jang),류승오(Seung-Oh Ryu),박준호(June-Ho Park) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper presents a Windows graphic developed by the authors for the education and training of power system Object-oriented programming is a major trend in computer software because it increases flexibility of large-scale software systems. An efficient platform for power system simulation applications has been proposed. This paper presents an intuitive Windows-based program for the power system analysis. The advantages of the object-oriented approach are demonstrated with an implementation of the graphical program. It provides a graphical interface for designing the one-line diagram of the bus and analyzing the output of the simulations. A graphical editor to visually edit the power system, diagram, results processing and exporting and graphic presentations.
이상와에 발생한 정맥 기형에 대한 에탄올 경화치료 1례
양연준,강민수,김상협,문정환,Yang, Yeon Jun,Kang, Min Su,Kim, Sang Hyub,Moon, Jeong Hwan 대한후두음성언어의학회 2017 대한후두음성언어의학회지 Vol.28 No.2
We describe a case of venous malformation of pyriform sinus in 63 year-old patient, discovered incidentally. Venous malformation are the most common vascular malformations to arise in the head and neck. However venous malformation of the hypopharynx in the adult papulation are rare. The author performed successfully ethanol sclerotherapy for venous malformation of pyriform sinus, so we present the case with a review of the related literatures.
Peer-to-Peer 환경에서의 정보 공유를 위한 인증 메커니즘 구현
이정기,배일호,이철승,문정환,박찬모,이준,Lee, Jeong-Ki,Bae, Il-Ho,Lee, Cheol-Seung,Moon, Jung-Hwan,Park, Chan-Mo,Lee, Joon 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.7
정보사회로 진행되어 감에 따라 컴퓨터 네트워크 사용 및 규모의 증대는 더욱 가속화되어 가고 있다. 또한 컴퓨터 네트워크를 통해서 교환되는 정보의 양의 증가와 함께 네트워크의 보안성이 새로운 문제점으로 부각되고 있다. P2P는 자유로운 네트웍을 구성할 수 있고, 중앙 서버 기능을 없애거나 약화시켜서 각 User간에 참여판 수 있는 개방 네트워크이기 때문에, 각 User간 인증에 관한 문제가 대두되고있다. 네트웍에 있는 어떤 사용자가 공개된 환경에 있다고 가정하면, 각 User간에 허가받은 사용자에게만 접속을 제한하기 위해서는 서비스에 대한 요구를 인증 해야한다. 본 논문에서는 이를 해결하기 위해 P2P 환경에서 보안을 유지하는 방법을 제안하고, P2P 환경에서 안전하게 정보를 공유할 수 있는 메커니즘으로 Kerberos 인증 메커니즘을 인용하여 인증 메커니즘을 설계하였다. According as progress by information society, computer network use and enlargement of scale are accelerated more. Also, with good physician increase of information that is exchanged through computer network, security of network is embossed to controversial point that is new. Because P2P as that remove or weakens center server function is open network that can participate between each user, problem about authentication between each users is risen. If certain user in network i3 in open environment, this user must authenticate request about service to user who is admitted between each user to limit connection. This treatise proposed method to keep security in P2P environment to solve this and designed certification mechanism that quote Kerberos certification mechanism to mechanism that can share information safety in P2P environment.