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($NiAl+Ni_3Al$) 2상 합금의 미세 조직과 기계적 특성에 관한 연구
이종훈,최병학,이남진,김학민,이진형,Lee, Jong-Hun,Choe, Byeong-Hak,Lee, Nam-Jin,Kim, Hak-Min,Lee, Jin-Hyeong 한국기계연구원 1994 硏究論文集 Vol.24 No.-
The Ni-Al intermetallic compound that has the greatest potential to be commercialized shows the high ductility at room temperature with the addition of boron, but has extremely low ductility at high temperature and oxidation environment. On this research work, the changes of microstructure and compressive fracture properties were studied in ($NiAl+Ni_3Al$) two-phase alloys. The precipitation behavior of $Ni_3Al$ after solution treatment at $1300^\circC$ for 14hrs and aging treatment at $800^{\circ}C$ for 14hrs was varied with Al content in ($NiAl+Ni_3Al$) two-phase alloys. These microstructure could be modified dramatically by suitable heat treatments. Martensite or martensite plus $Ni_3Al$ microstructure was obtained upon oil quenching from $1300^\circC$. Aging of Martensite at $800^\circC$ resulted in the $Ni_3Al$ plus NiAl phase. The compressive fracture strength and compressive fracture strain were improved by the $Ni_3Al$ plus NiAl phase mixtures at room temperature and $1100^\circC$. Microcracks are observed mostly in the region of NiAl and the interface of $NiAl-Ni_3Al$ phase after compressive test at room temperature. In the case of high temperature compressive test, microcracks are formed in the region of $Ni_3Al$ phase.
Ilizarov 시술 후 추적검사에 있어 초음파검사의 유용성 : 단순촬영과의 비교
이종훈,지성우,이호원,이성문,김정식,김홍,송광순,조길호,우성구,Lee, Jong Hoon,Jee, Sung Woo,Lee, Ho Won,Lee, Sung Moon,Kim, Jung Sik,Kim, Hong,Song, Kwang Soon,Cho, Kil Ho,Woo, Sung Ku 대한영상의학회 1998 대한영상의학회지 Vol.38 No.6
Purpose : To compare the usefulness of ultrasonography in follow up evaluation after the Ilizarov procedurewith that of plain radiography. Materials and Methods : We analyzed ultrasound findings in twelve patients who hadundergone the Ilizarov procedure, and retrospectively compared the results with the findings of plain radiography.The procedure was performed due to post-traumatic limb deformity or non-union(nine of twelve patients), congenitalpseudoarthrosis(one case), sequelae of poliomyelitis(one case), and short stature(one case). The patients' meanage was 29 years ; eleven of twelve were male. Ten of twelve procedures were performed on the tibia and two on thefemur. After 7-10 days, distraction was initiated at a rate of 0.25mm four times a day. Ultrasonography wasperformed with a 5-10 MHz linear or convex transducer ; new bone formation was defined as dotted or linearechogenic foci within a hypoechoic distraction gap. Initial ultrasonographic examination was performed 2-4 weeksafter distraction, and the results were compared with those of plain radiography. Color Doppler imaging wasperformed in three cases. Results : On ultrasonograms, new bone formation was initially detected 18-29(mean, 23)days after distraction, and on plain radiographs, 37-58(mean, 45) days after this procedure ; ultrasonography thusdetected new bone formation at least three weeks earlier than did plain radiography. Complication after theIlizarov procedure were four cysts at the distraction site, and one pin site infection, as seen on ultrasonograms.None of these four cysts, the size of which was 12-22mm(mean, 17mm), was visible on plain radiographs. In one casein which a cyst was present, ultrasound-guided aspiration was performed. Color Doppler examination was performedin three of twelve patients, and in all three, periosteal vascularity at the edge of the distracted gap was seento be preserved. Conclusion : After the Ilizarov bone lengthening procedure, ultrasound appears to be useful forfollow-up examination. New bone formation, as well as complications, can be detected earlier ; it can indicatewhether ultrasound-guided interventional procedure is required, and if combined with color Doppler study, is ableto detect the periosteal blood supply. Further evaluation of the clinical significance of preserved periostealblood supply seems however, to be needed.
랫드에서 hyaluronic acid에 의한 유착 방지 효과에 관한 연구
이종훈,이주명,윤영민,강태영,우호춘,강윤호,김남중,김희석,이경갑,정종태,Lee, Jong hoon,Lee, Joo Myoung,Yun, Young min,Kang, Tae young,Woo, Ho choon,Kang, Yoon ho,Kim, Nam joong,Kim, Hee seok,Lee, Kyoung kap,Cheong, Jongtae 대한수의학회 2004 大韓獸醫學會誌 Vol.44 No.4
This study was conducted to investigate the effect of hyaluronic acid (HA) on prevention of abdominal adhesions depending on various concentrations thereof by inducing an abrasion experimentally in the cecum of rats. Each group was consisted of 10 rats, and 40 rats were divided into 4 groups comprising the saline treatment group, HA 0.4% treated group, 0.6% treated group, and 0.8% treated group. And abrasion was caused in the cecum by using dry gauze and thereby, adhesion was induced. On 7 days after the operation, adhesions of each region were evaluated into the range of 0-4. Significant difference was found in the adhesion score between the control group and each experimental group (P<0.05). Also, HA 0.4% treatment group showed the lowest adhesion score (P<0.05). In the light of the above results, HA 0.4% solution was more effective on prevention of adhesion than HA 0.6% and 0.8% solution.
이종훈,Lee, Jong-Hoon 한국정보통신집흥협회 1997 정보화사회 Vol.118 No.-
2000년 연도표기 문제의 범위는 메인프레임, 크라이언트 서버, PC, BIOS 등의 하드웨어와 운영체제, 컴파일러, 통신프로그램 등의 시스템소프트웨어 패키지소프트웨어, 자체 개발프로그램과 기타 사무기기 등에 있다.
이종훈,이경식,Lee, Jong-Hun,Lee, Kyung-Shik 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.12
본 논문에서는 유니폼 위상마스크를 이용하여 긴 광섬유격자를 제작할 수 있는 새로운 방법을 제안한다. 제안하는 방법은 짧은 유니폼 위상마스크 한 개를 이용하여, 유효굴절률이 일정하거나 선형적으로 변하는 여러개의 부광섬유격자(subgrating)를 직렬로 연속적으로 제작함으로써 긴 광섬유격자를 제작하는 방법이다. 길이가 25mm인 한 개의 유니폼격자를 사용하여 200mm이고, 반사율 95% 이상인 유니폼 공섬유격자를 제작하였으며, 길이가 250mm이며 대역폭과 분산보상기울기의 평균값이 0.5nm와 4.965ps/nm인 선형처프된 광섬유격자를 제작할 수 있었다. A new method for fabricating long fiber Bragg gratings(FBGs) using uniform phase mask is proposed. The proposed method is characterized by forming a number of subgratings sequentially in series and varying linearly the effective refractive index of each subgrating. The reflectivity of a 200mm long uniform FBG developed fabricated by the method is about 95%. Also, the bandwidth and dispersion slope of a 250mm long linear-chirped FBG developed here are ∼0.5nm and ∼4.965ps/nm respectively.
이종훈,Lee, Jong-Hun 한국데이터베이스진흥원 2006 디지털콘텐츠 Vol.5 No.-
200년 여름. 우리들은 월드컵을 통해서 하나가 되었고 그 안에서 감동을 느꼈다. 특히 우리나라의 4강신화는 세계 속에 대한민국이란 브랜드를 확실하게 각인시키며 엄청난 홍보 효과를 가져다 줬다. 4년이 지난 지금 우리는 세계적인 축제이자 모든 축구선수들의 희망인 또 한번의 월드컵을 애타게 기다리고 있다. 4년전의 기쁨과 감격을 다시 누릴 수 있게 되길 기원하면서 말이다. 그래서 일까, 유저들의 니즈를 파악한 게임업체들은 월드컵 특수를 노리며 앞다퉈 축구게임을 출시하고 있다. 축구란 대중성을 가진 스포츠를 게임으로 구현, 분위기까지 잘 맞물리게 한다면 기대 이상의 성과를 얻을 수 있기 때문이다.
이종훈,유위도,Lee, Jong-Hun,Yu, Wi-Do 한국기계연구원 2000 硏究論文集 Vol.30 No.-
The failed tube received for this study has been used for approximately 10 year at $330^{\circ}C$ in a steam production boiler tube was fractured in the transversed direction to tube length, and fracture mode was typically intergranulas type without the plastic deformation. The fracture surface was covered by the oxide scale formed from the intermal high pressure steam at high temperature. The microstructure was not nearly thermal-degraded during the service. From this result, we can conclude that the oxide film was proferentialy formed into the grainboundary and this grainboundary oxide film was brittle-fractured by the thermal stress in the longitudinal direction to the tube brittle intergranular fracture mode.