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대전류 $CO_2$ 용접에서 스패터 저감을 위한 파형제어 기법 개발
김희진,강봉용 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.6
A new waveform control technique has been developed for suppressing the spatter generation in the repelled transfer mode of high current $CO_2$ welding. Based on the spatters in repelled transfer, a waveform concept of concept was established in a way to drop the welding current to lower level right before the pendant weld drop detatchment so that the explosion force associating with drop detatchment was decreased. There were several variables to be controlled such as the moment of current drop, the base current and the time of retention at the base current. Either at lower base current or at longer retention time, the more instantaneous shot circuits were int개duced and thus the spatter generation rates were increased. With optimizing the control variables, the amount of spatter generated was decreased by about 30%.
김희진,Kim, Heejin 한국인터넷방송통신학회 2018 한국인터넷방송통신학회 논문지 Vol.18 No.1
In this paper, I introduce web 2.0 tool with which cooperative learning is possible based on C4LPT, and suggest educational application plan of web 2.0 tool by offering briefly the teaching-learning process plan for application class of web 2.0 tool. The class through the suggested teaching-learning process plan encouraged participation so that the common goal of a small group could be achieved and provided a web base where free communication could be possible. Futhermore, by using the collaboration space of web 2.0 tool, I could attract learners' study interest and maintain learning atmosphere. Based on teaching-learning process plan, I have taught university freshmen from 2012 to the present, and I could confirm the possibility of education application and the satisfaction of education application of web 2.0 tool through students' learning results and a survey. 본 논문에서는 C4LPT를 토대로 협동학습이 가능한 웹 2.0 도구를 소개하고, 웹 2.0 도구 활용 수업을 위한 교수 학습 과정안을 간략하게 제공함으로써 웹 2.0 도구의 교육적 활용방안을 제안한다. 제안한 교수 학습 과정안을 통한 수업은 소집단, 공동의 목표를 달성할 수 있도록 참여를 독려하고 자유롭게 소통할 수 있는 웹기반 환경을 제공했다. 또한 웹 2.0 도구의 공동 작업 공간을 이용하여 학습자의 학습적 흥미를 이끌고, 학습 분위기를 유지할 수 있었다. 제안한 교수 학습 과정안을 토대로 2012년부터 현재까지 1학년 대학생 대상으로 수업을 하였으며, 학생들의 만족도 조사 및 학습 결과물을 통해 웹 2.0 도구의 교육적 활용이 가능함을 보인다.
반회후두신경 손상을 동반하지 않은 갑상선 절제술 환자에서 수술 초기의 음성 및 연하 기능의 변화에 대한 분석
김희진,금보람,김근희,전승식,김혜진,김성균,홍석진,홍석민,김용복,박일석,Kim, Heejin,Keum, Bo-Ram,Kim, Geun Hee,Jeon, Seung Sik,Kim, Hyejeen,Kim, Sung Kyun,Hong, Seok Jin,Hong, Seok-Min,Kim, Yong-Bok,Park, Il-Seok 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.2
Background and Objectives : After thyroidectomy, many patients experience problems report such things as reduced voice range and vocal fatigue, swallowing problems without superior and recurrent laryngeal nerve injury. The purpose of this study was to evaluate voice and swallowing problems before and after thyroid surgery without laryngeal nerve injury. Materials and Methods : Ninety-three patients who underwent thyroidectomy without laryngeal nerve injury and completed the follow-up evaluations were studied between June 2013 and December 2015. Each evaluation was performed preoperatively, as well as 1 week, 1 month postoperatively. Analysis was performed including voice handicap index (VHI), dysphagia handicap index (DHI), and acoustic voice analysis. Results : Patients show significant variation of parameters in the fundamental frequency (F), maximal phonation time (MPT), shimmer, jitter and soft phonation index (SPI) early after operation, and most of them showed recovery of parameters after 1month of operation. Perceptive complaint of voice and swallowing also showed significant decreased after operation (p<0.005). After 1month of operation, MPT, highest frequency and frequency ranges still showed significant decreased parameters. Comparing acoustic and perceptive parameters of total thyroidectomy and lobectomy, there was no significant changes between them except highest frequency (p=0.042). Conclusion : The results from both subjective and objective evaluations show voice and swallowing disturbance after thyroidectomy even in the absence of laryngeal nerve and provide patients information about the recovery process after surgery. Highest frequency parameter showed most significant changes after operation.