http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고밀도화 탄소 블록 제조 시 콜타르계 피치의 점도가 함침에 미치는 영향
조종훈 ( Jong Hoon Cho ),황혜인 ( Hye In Hwang ),김지홍 ( Ji Hong Kim ),이영석 ( Young-seak Lee ),임지선 ( Ji Sun Im ),강석창 ( Seok Chang Kang ) 한국공업화학회 2021 공업화학 Vol.32 No.5
본 연구에서는 코크스, 바인더 피치 및 함침 피치를 사용하여 고밀도 탄소 블록을 제조하고, 함침 공정 시 피치의 유동성이 탄소 블록의 고밀도화에 미치는 영향을 고찰하였다. 코크스와 바인더 피치의 고압 성형을 통해 그린블록을 제조하고 열처리 공정을 통하여 탄소 블록을 얻었다. 열처리 공정 시 바인더 피치의 휘발에 의해 생성된 기공을 제거하고자 함침 공정을 진행하였다. 함침 공정은 함침 피치를 용융하는 전처리 단계와 피치를 탄소 블록에 함침하는 고압 반응 단계로 나누어 진행하였다. 함침 피치의 용융은 140~200 ℃에서 진행하였으며, 열처리 온도가 증가할수록 함침 피치의 점도가 감소하였다. 함침 피치의 점도 감소는 유동성을 향상시켜 탄소 블록 내부 기공을 효율적으로 함침하여 탄소 블록의 기공률을 83% 감소시켰고 겉보기 밀도를 5% 상승시켰다. In this study, high-density carbon blocks were manufactured using coke, binder pitch, and impregnated pitch, then the effect of pitch fluidity on the densification of carbon blocks during the impregnation process was investigated. A green block was manufactured through high-pressure figuration of coke and binder pitch, and a carbon block was obtained through a heat treatment process. An impregnation process was performed to remove pores generated by volatilization of the binder pitch during the heat treatment process. The impregnation process was carried out the high-pressure reaction step of impregnating the pitch into the carbon block followed by the pretreatment step of melting the impregnation pitch. Melting of the impregnation pitch was carried out at 140~200 ℃, and the viscosity of the impregnation pitch decreased as the heat treatment temperature increased. The decrease in the viscosity of the impregnation pitch improved the fluidity and effectively impregnated the pores inside the carbon block, reducing the porosity of the carbon block by 83% and increasing the apparent density by 5%.
열분해유 유래 피치로부터 이방성 미세구조 코크스 제조 및 특성 평가
조종훈 ( Jong Hoon Cho ),김지홍 ( Ji Hong Kim ),이영석 ( Young-seak Lee ),임지선 ( Ji Sun Im ),강석창 ( Seok Chang Kang ) 한국공업화학회 2021 공업화학 Vol.32 No.6
본 연구에서는 열분해유 유래 피치 합성 및 합성 피치로부터 이방성 미세구조를 갖는 코크스를 제조하고 그 특성을 평가하였다. 열분해유는 주로 방향족 고리가 2~3개로 구성된 분자로 이루어져 있어, 400 °C 이상의 온도에서 흡열반응인 축합중합으로 피치가 제조되었다. 코크스 반응기는 피치를 유동화 시키는 전처리 반응기, 코킹화 열에너지를 가해주는 preheater 및 코크스의 미세구조를 유도하는 코크스 드럼으로 구성되었으며, preheater의 온도를 400~490 °C로 조절하여 제조된 피치로부터 코크스를 제조하고 편광현미경, XRD 및 Raman spectroscopy로 특성을 평가하였다. Preheater의 온도가 460 °C에서 제조된 코크스는 이방성 미세조직이 flow 형태로 나타났으며, 높은 결정성으로 전기전도성이 72.0 S/cm이였다. 그리고 전도성 탄소 재료인 Super-P보다 대략 2.2배 높은 전기전도성을 나타냈다. In this study, pitch was synthesized using pyrolysis fuel oil (PFO). Coke with mesophase microstructure was then prepared from the synthesized pitch and its properties were evaluated. Pitch was synthesized by poly-condensation reaction, which is an endothermic reaction at a temperature above 400 °C because the PFO was mainly composed of molecules with two to three aromatic rings. The Coke reactor was composed of the pretreatment reactor, preheater for applying heat energy, and coke drum for inducing microstructure of coke. Coke was prepared from synthesized pitch by controlling the temperature of the preheater to 400~490 °C, and properties were evaluated by polarization microscope, XRD and Raman spectroscopy. The coke prepared at a preheater temperature of 460 °C identified flow anisotropic microstructure, and the electrical conductivity was 72.0 S/cm due to high crystallinity. And the flow anisotropic coke showed approximately 2.2 times higher electrical conductivity than that of Super-P, a conductive carbon material.
고정층 흡착탑에서 다성분 휘발성 유기화합물의 활성탄 흡착 특성
조종훈 ( Jong Hoon Cho ),이시훈 ( Sihyun Lee ),이영우 ( Young Woo Rhee ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2
This study aims to examine absorption characteristics of toluene, isopropyl alcohol (IPA), ethyl acetate (EA), and ternary-compounds, all of which are widely used in industrial processes, by means of four types of commercial activated carbon substances. It turned out that among the three types of volatile organic compounds, the breakthrough point of activated carbon and that of IPA, whose affinity was the lowest, were the lowest, and then that of EA and that of toluene in the order. With the breakthrough point of IPA, which was the shortest, as the standard, changes in the breakthrough points of unary-compounds, binary-compounds, and ternary-compounds were examined. As a result, it turned out that the larger the number of elements, the lower the breakthrough point. This resulted from competitive adsorption, that is, substitution of substances with a low level of affinity with those with a high level of affinity. Hence, the adsorption of toluene-IPA-EA and ternary-compounds require a design of the activated carbon bed based on the breakthrough of IPA, and in the design of activated carbon beds in actual industries as well, a substance whose level of affinity is the lowest needs to be the standard.
퇴행성 골관절염 환자에 시행한 무시멘트 Ortholoc 형 슬관절 전치환술
배대경,조종훈,이용욱 ( Dae Kyung Bae,Jong Hoon Cho,Yong Wook Lee ) 대한슬관절학회 1996 대한슬관절학회지 Vol.8 No.1
Advantages of cementless artkropIasty are preservation of bone stock. The most encouraging aspect of this series of total knee arthroplasties is the ease of revisability in the components. Ortholoc Knee has the accuracy and reproducibility of hone cutting with the effective intramedullary alignment system and the rigid fixation of the tibial component by using screw and pegs. The patella component is inset-patella type. From Octoher 1990 to May 1993, the authors analyzed 50 patients, 82 cementless Ortholoc II and Ortholoc Modular tota] knee arthroplasty in osteoarthritis with an average 3 years 3 months (range 2 ycars to 4 years 6 months) follow up period. There were 35 cases in left side of knee, 47 cases in right side, 43 patients in female and 7 patients in male. The average age was 61.5 years (range 28 to 77 years). At the clinical analysis, preopera(.ive average HSS knee rating score was 56.5 point (31 to 82 points). At the last follow up, HSS Knee rating score was 91.2 point (85 to 98 points). Preoperative average ROM was 108.7 degrees (70 to 120 degrees). At the 1ast follow up ROM was 118.5 degrees (90 to 135 degrees). Preoperative flexion contracture was average I0.7 degrees (0 to 40 degrees). At the last follow up, flexion contracture was average 0,6 degree (0 to 10 degrees). For the radiographical analysis, American Knee Society Roentgenographic Evaluation and Scoring System was used. The ccmponent position was as follows; average value of' a angle was 93.8 degrees(89-100), p angle was 90.4 degrees(86-98) in anteroposterior view and g angle was S.2 degrees(0-18), 8 angle was 90A degrees(83-98) in lateral view. In the plain AP view, preoperative average tibiofemoral shaft;mgle was varus 8.5 degrees (range varus 3 to 25 degrees). Postoperative average tibiofemoral shaft angle was corrected as valgus 6.5 degrees (range 4 to 10 degrees). Regarding the position of central stern to tibial shaft axis, 38 cases were found to be located in lateral side, 30 cases in medial side, and 14 cases in neutral side. Tiltin angle of tibial tray to the perpendicular articular line of tibial shaft axis was average 1.7 degrees (rarvc I to 4 clerees) in cases with valgus alignment of tibial components and -2A degrees (range - I to -5 degrees) in cases with varus alignment, The distance between axial lines of tibial component and tihial shaft was average 4.7mm (range l to 6mm) in valgus alignment, and 5.3mm (range I to 7mm) in varus alignment. There was no loosening and wear The clinical and radiological findings revealed no distinc1 differcnces between these two implants. In summary, total knee replacement without using bone cement is a rclinhle and effective methocf of treating degenerative arthritic knee. The accuracy of hone cutting and the femoral and tihial entry p(oints of intramedullary rod are very important for the correct insertion andd alignment of prosthetic component..
경골과간 융기부 전이 골절의 관절경하 정복 및 견인 봉합술
안진환,김병순,조종훈 ( Jin Hwan Ahn,Byung Soon Kim,Jong Hoon Cho ) 대한슬관절학회 1994 대한슬관절학회지 Vol.6 No.2
The purpose of this paper is to demonstrate the effectiveness of the arthroscopic treatment for the displaced fractures of the intercondylar eminence, and the technique of the arthroscopic assisted reduction and the fixation with pull-out suture. Seven patients underwent the arthmscopic surgery for these displaced fracures and were followed up from fifteen months to thirty-one months. There were five fresh fractures and two displaced nonunion of fractures resulted in the lack of extension at the involved knees. In all of the patients the avulsed fragments were reduced arthroscopicaUy, and fixed by the arthroscopic-assisted pull-out sutures. At follow up, all but one patient returned normal life activity and preinjury sports activity level without any symptom. The advantages of arthmscopic-assisted pull-out suture were to obtain the secure fixatien for a small or comminuted avulsed fragment and to promote early rehabilitation. But some skillful technique is needed for a successful result.
정덕환,한정수,김진원,안옥균,조종훈,Chung, Duke-Whan,Han, Chung-Soo,Kim, Jin-Won,Ahn, Ok-Kyun,Cho, Jong-Hoon 대한미세수술학회 1993 Archives of reconstructive microsurgery Vol.2 No.1
The authors analyzed the clinical results of the reconstructive surgery for injured hands and feet due to frostbites and electrical burn with microsurgery in 7 patients, 12 cases at the department of orthopaedic surgery, school of medicine, Kyung Hee university from Jan. 1989 to Jul. 1992, and the results were as foollowings. 1. The age at the time of injury was av 24.6 yrs ranging from 4 to 35 yrs, and all cases were male. 2. The follow up period was av. 24.4 Mo ranging from 12 Mo. to 56 Mo. 3. The causes of injury were frostbite in 9 cases, electrical burn in 2 cases. 4. Initial operative treatment was performed av. 69.3 days ranging from 2 to 210 days. 5. For the reconstructive procedure, scapular free flap was applied in 6 cases, radial forearm flap in 4, dorsalis pedis 1ffap in 1, neurovascular island flap in 1. 6. Among total 12 cases, there were 5 cases(41.7%) of wound infection and 3 cases (25.0%) of partial necrosis of donor flap. 7. In 11 cases(90.1%), the end result was satisfactory. In the analysis of above results the reconstruction with microsurgery is effective procedure for reconstruction of Injured hand and foot due to frostbite and electrical burn.