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Characterization of Silica-potassium titanate hybrid filler
남기동,류승훈,구보람,김재익 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Polymer has been studied as a material such as automobiles and home appliances because of the advantage that it is light and can be processed at low temperature compared to metal. However, the wear characteristics have been required for the application to replace the metal. Potassium Titanate (PT) has excellent wear performance, but the mechanical properties are not good, there has been a limitation in the application. And silica has been widely used to improve mechanical properties, but it has been known that the improvement effect is not better than PT in terms of wear performance. In this study, in order to simultaneously use resistance of PT and mechanical properties of silica, PT and silica were chemically combined and then checked for bonding through FR-IR and XRD. The mechanical properties will be evaluated and the wear characteristics will be checked using a wear tester, the morphology of the wear surface will be confirmed by using the FE-SEM.
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1P-83 Polyamide 66 복합체의 aging 환경에 따른 특성 변화
남기동,김재익,류승훈 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Polyamide 66는 기계적, 열적 특성이 뛰어나 IT, 자동차, 스포츠 등에 사용되는 엔지니어링 플라스틱이다. 하지만 Polyamide 66는 수분 접촉 시 아미드기의 hydrolysis에 의한 기계적 물성의 저하가 발생하는 것으로 알려져 있다. 본 연구에서는 glass fiber, MAH기를 가진 반응성 수지가 첨가된 Polyamide 66 복합체의 수분에 의한 기계적 물성 변화를 확인하고 DSC를 이용하여 용융거동을 연구할 예정이다.
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경요도적 절제술 후 방광 이행세포암의 재발에 관계하는 요소들
남기동,구봉식,윤성국,박병호,남경진,최종철,이기남,이영일,정덕환,Nam, Gi-Dong,Koo, Bong-Sik,Yoon, Sung-Guk,Park, Byeong-Ho,Nam, Gyeong-Jin,Choi, Jong-Cheol,Lee, Gi-Nam,Lee, Yeong-Il,Jeong, Deok-Hwan 대한영상의학회 1998 대한영상의학회지 Vol.38 No.4
Purpose: To evaluate factors related to the recurrence of TCC(transitional cell carcinoma) in the urinary bladder after transurethral resection of bladder tumor(TUR-BT). Materials and Methods : We retrospectively reviewed 54 patients in whom TCC (transitional cell carcinoma) after TUR-BT had been confirmed. Recurrence was evaluated by US, CT, cystoscopy and urine smear during the follow-up period of 6 months. The multiplicity, shape, size, and calcification of TCC, as revealed by radiologic studies, were evaluated retrospectively before TUR-BT. After TUR-BT, the histologic grade and pathologic stage of TCC were evaluated. Results : According to the multiplicity of TCC, the recurrence rate was 66.7% in the multiple type and 28.6% in the single type(p=0.039);according to shape, this rate was 61.5% in the sessile type and 29.3% in the pedunculated type(p=0.0505), and according to mass size, the rate was 41.7% in tumors more than 3cm in diameter and 35.7% in tumors less than 3cm(p=0.706). In the presence of calcification, the recurrence rate was 40.0% and in its absence, this rate was 36.7%(p=0.885). Pathologically, the higher the grade and stage of TCC, the higher the recurrence rate(respectively p=0.010 and 0.041). Conclusions : Radiologically, multiple and/or sessile type TCC had a higher recurrence rate than the single and/or pedunculated type. Pathologically, when the grade and stage of bladder tumor were higher, recurrence rates were higher.
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정기룡 장군의 군사사상 연구 : 임진왜란 당시 그가 참전한 주요전투 승리요인 분석을 중심으로
남기동,박효선 육군군사연구소 2020 군사연구 Vol.- No.150
There are some earlier studies about the life and historical activities of General Jung Ki-ryong, who played a significant role during Japanese invasion of Korea, but no prior study regarding his military ideology has been conducted. Thus, this study aims to deduce the general’s military ideology by analyzing his major battles recorded in his biography ‘Maeheounshilgi(梅軒實記)’. The definition of military ideology is ‘conceptual thought process on how to prepare and carry out a war with what war will and belief based on the right perception of present and future wars to accomplish the national goal.’ Military ideology consists of the will and conviction in conducting a war, the construction of military force, and the operation of military force. Since historical records of the general including ‘Maeheounshilgi(梅軒實記)’ are mainly comprised of his wartime accomplishments and how he carried out combats, inferring the construction of military force is limited. Thus, this study analyzes the general’s military ideology by focusing on the operation of military force and the will and conviction in conducting a war. According to the study, military ideologies of General Jung Ki-ryong are as follows. With regard to the operation of military force, the general carried out ① Fast execution, ② Manned ambush, ③ Surprise attacks and guerrilla operations after thoroughly examining battlefields and strengths and weaknesses of both forces. With regard to the will and conviction in conducting a war, at every war he practiced ① True courage, ② Devotion to accomplish goals, ③ Patriotism, respect and consideration, ④ Creativity. The contemporaries of the rapidly changing present and future should establish and practice survival strategies in order to resolve crises confronting them. General Jung Ki-ryong’s military ideologies presented in this study would provide guidance to lay foundations of such strategies. In future research, it is vital to discover more historical records of General Jung Ki-ryong and to examine combat situations at the time considerably, and quantified and clearly defined analysis tools should be developed and applied in order to deduce his military ideologies. 임진왜란 때 활약한 정기룡 장군의 생애와 역사적 행적에 관한 선행연구는 일부 있으나 그의 군사사상에 관한 연구는 이루어지지 않았다. 이에 본 연구는 정기룡의 일대기가 기록된 ‘매헌실기(梅軒實記)’에서 그가 참전한 주요전투를 분석하여 군사사상을도출하고자 하였다. 군사사상은 ‘국가목표를 달성하기 위해 현재 및 장차 전쟁에 대한 올바른 인식을 토대로 어떠한 전쟁의지와 신념으로 어떻게 전쟁을 준비하고 수행할 것인가에 관한 개념적 사고체계’이다. 군사사상은 전쟁수행 의지 및 신념, 군사력 건설, 군사력 운용으로구성된다. ‘매헌실기(梅軒實記)’를 포함한 정기룡에 관한 역사 자료는 그의 전투수행방법과 전과위주로 기술되어 군사사상 구성요소 중 ‘군사력 건설’은 도출이 제한되었다. 이에 본 연구는 군사사상의 구성요소 중 ‘군사력 운용’과 ‘전쟁수행 의지 및 신념’ 에 한정하여 정기룡의 군사사상을 분석하였다. 연구결과는 다음과 같다. ‘군사력 운용’ 측면에서는 피아 강약점 및 전장지역을 철저하게 분석한 후 ①속전속결, ②유인매복, ③기습 및 유격작전을 수행하였다. 또한‘전쟁수행 의지 및 신념’ 측면에서는 ①용기, ②책임완수, ③애민정신과 존중 및 배려, ④창의성 발휘를 실천하였다. 임진왜란이라는 국가 존망의 위기에 나라를 지키기 위해 노력한 정기룡의 군사사상은 급변하는 현재와 미래를 살아가는 현대인들에게 닥친 위기상황을 해결하기 위한 생존전략을 수립하고 시행하는데 도움이 되리라 생각한다. 향후 연구에서는 정기룡에 관한 보다 많은 사료를 발굴하여 당시 전투상황을 실질적으로 고증하는 것이 필요하다. 또한, 군사사상 연구방법의 계량화된 구체적인 분석도구 개발과 연구가 이루어져야 한다.
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