부안정수장 송수펌프의 운영방안에 관한 연구

이종훈,이동원,윤영수,이정우,Lee, Jong-Hoon,Lee, Dong-Won,Yoon, Young-Soo,Lee, Jung-Woo 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.19 No.4

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.

골판지 고지의 물리화학적 처리에 의한 강도향상(제3보) - 수초지의 물리적 특성변화 -

이종훈,서영범,전양,이학래,신종호,Lee, Jong-Hoon,Seo, Yung B.,Jeon, Yang,Lee, Hak-Lae,Shin, Jong-Ho 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.2

This study is a continuation of the previous experimental analysis and is mostly focused on handsheet strength properties. Four completely different fibers, which were Hw-BKP, SW-BKP, White ledger, and OCC, were selected to investigate the effect of mechanical pre-treatment by Hobart mixer on handsheet strehgth properties. After equal time mechanical pre-treatment, the fibers were refined with laboratory valley beater for 10, 20 and 30 minutes, and handsheets were prepared from the fibers for physical strength comparison. Handsheets from SW-BKP and OCC showed 5-30% increase of breaking length, burst index, tear index, and compression index while handsheets from HW-BKP and White ledger no increase except tear index. In Hobart mixer pre-treatment, HW-BKP and White ledger fibers were easily attached to the wall of the mixer bowl and mechanical action was not effectively applied. The fiber length of Hw-BKP and White ledger were 0.837 mm and 1.591 mm, respectively, while SW-BKP and OCC were 2.744 mm and 2.033 mm, respectively, in weight weighted length. The effective mechanical pre-treatment seems to be related to the fiber length. Tear indexes of the pre-treated furnish were much higher than no pre-treatment at the same breaking length level.

골판지 고지의 물리화학적 처리에 의한 강도향상(제2보)

이종훈,서영범,전양,이학래,신종호,Lee, Jong-Hoon,Seo, Yung B.,Jeon, Yang,Lee, Hak-Lae,Shin, Jong-Ho 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.2

In the previous experiment, it was found that OCC pre-treatment with Hobart mixer at 20-25% consistency for 3 hrs or more followed by the application of the equal refining time, caused the increase of tensile strength, burst strength, compressive strength and tear resistance, compared to the no pre-treated. Four completely different fibers, which were Hw-BKP, Sw-BKP, White ledger, and OCC were selected for this experiment to investigate the effect of mechanical pre-treatment process on different fibers. From the experiment, it was found that the mechanical pre-treatment did not decrease fiber length at all, but decreased freeness, com-pared to the no pre-treated, when the same refining time was applied. WRVs of the pre-treated fibers were higher than the no pre-treated at the same freeness level. It was speculated that the mechanical pre-treatment induced only hydrophilic nature of fibers without damaging fiber length by delaminating fiber walls. The fiber surface area and the physical strength differences of handsheets will be discussed in the next publication.

골판지 고지의 물리화학적 처리에 의한 강도 향상(제 1 보)

이종훈,서영범,전양,Lee, Jong-Hoon,Seo, Yung B.,Jeon, Yang 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.1

To improve the physical properties of OCC (Old Corrugated Container) fibers, we used the mechanical pre-treatment on the fibers before refining . The mechanical action in the Hobart mixer induced high shear and compression on the fibers, which resulted in changes of fiber internal structure, and microcompressions on the surface of the fibers. We evaluated the amount of mechanical treatment on the fibers by fiber curl index for convenience. Four different refining techniques were applied to the pre-treated fibers (valley beater, Kady mill, PFI mill, and Impact refining) to find the best combination of the pre-treatment and the refining methods. Conclusions were summarized as followed. 1. Mechanical pre-treatment in Hobart mixer for more than 1 hour caused the increase of curl index of OCC fibers, and increased breaking length, burst index, and tear index the handsheets more than 10 % in this experiment. 2. Kady mill and PFI mill refining were effective in keeping fiber length from shortening Kady mill and Valley beater refining straightened out the fiber curls, and reduced the curl index. 3. Valley beating reduced fiber length very fast and generated fines more than other refining methods. 4. To increase breaking length and burst strength while keeping tear strength , combination of mechanical pre-treatment and Valley beating were most effective.

2000년 연도표기문제 비용산정의 예

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.

인진청간탕(茵蔯淸肝湯)이 HepG2 cell의 인터페론 신호전달계에 미치는 영향

이종훈,김영철,이장훈,우홍정,Yi, Jong-Hoon,Kim, Young-Chul,Lee, Jang-Hoon,Woo, Hong-Jung 대한한방내과학회 2005 大韓韓方內科學會誌 Vol.26 No.1

Objectives/Methods : To analyze the effect of Injinchunggantang(IJCGT) to Interferon-${\alpha}/{\beta}$ signal transmission system in HepG2 cells, HepG2 Cell were treated with IJCGT. Also, revelation of MxA, 2'5'-OAS mRNA leaded by Interferon-${\alpha}/{\beta}$ and revelation and activation of Jak1, TYK1, and STAT 1, all main signal transmission factors, were analyzed. Results : The analysis resulted in the following 1. With interferon ${\alpha}/{\beta}$ there was no affect cell propagation of Hep G2 cells. With IJCGT alone, cell propagation of HepG2 was promoted, and cell propagation control function was recovered. 2. With interferon ${\alpha}/{\beta}$ cell death was unaffected. With IJCGT apoptosis of HepG2 cell was restrained, and the cell's reaction to interferon was unaffected. 3. With interferon ${\alpha}/{\beta}$ treatment mRNA revelation of MxA and 2'5'-OAS was induced. When HepG2 cells were injected with IJCGT without interferon ${\alpha}/{\beta}$ treatment, mRNA revelation of MxA and 2'5'-OAS increased in proportion to the treatment density. With pre-treatment of IJCGT, leaded with interferon ${\alpha}/{\beta}$, promoted revelation of MxA, 2'5' -OAS mRNA. 4. Though mRNA revelation of lakl, TYK1 and STAT1 was unaffected with IJCGT, activation of STAT1 was promoted with an increase of phosphorylation of STAT1 protein. With pre-treatment of IJCGT, Jak1, TYK2, STAT1 phosphorylation, leaded with interferon, strengthened. 5. TNF-a, IL-1b and LPS present, revelation of MxA and 2'5'-OAS mRNA leaded by interferon was restrained when HepG2 cells were treated with IJCGT, and the interferon signal transmission system restraint action leaded by inflammatory cytokines was moderated. Conclusion : These results support a role for IJGCT in promotion of anti-virus action through maintainance of the liver's sensibility toward interferon. A clinical study of an interferon treated patient treated also with IJGCT is needed to determine its efficacy.

연구논문 - 수명 및 건전성평가 - : HK40 Reformer Tube 의 장시간 사용에 따른 미세조직과 기계적 특성 변화

이종훈,강수현,이재현,조경식,최승주 ( Jong Hoon Lee,Soo Hyeon Kang,Je Hyun Lee,Kyung Shik cho,Seung Joo Choe ) 대한금속재료학회 ( 구 대한금속학회 ) 1996 재료강도 심포지엄 Vol.- No.-

수소 환원 온도에 따른 몰리브덴 산화물의 성형 및 상압소결특성 평가

이종훈,이근재,Jong Hoon Lee,Kun-Jae Lee 한국분말재료학회 (*구 분말야금학회) 2024 한국분말재료학회지 (KPMI) Vol.31 No.4

Molybdenum, valued for its high melting point and exceptional physical and chemical properties, is studied in diverse fields such as electronics, petrochemicals, and aviation. Among molybdenum oxides, molybdenum dioxide stands out for its higher electrical conductivity than other transition metal oxides due to its structural characteristics, exhibiting metallic properties. It is applied as pellets to gas sensors, semiconductors, and secondary batteries for its properties. Thus, research on molybdenum dioxide compaction and pressureless sintering is necessary, yet research on pressureless sintering is currently insufficient. This study synthesized MoO₃ powder via solution combustion synthesis and reduced it using the 3% hydrogen/argon gas mixture to investigate the effect of reduction temperature on the powder. Additionally, the reduced powder was compacted and subjected to pressureless sintering with temperature as a variable. The density and the microstructure of brown parts were analyzed and discussed.