VOCs의 동역학상수에 관한 비교연구

김종오 木浦大學校 沿岸環境硏究所 1999 沿岸環境硏究 Vol.16 No.1

액상에서 생물분해는 휘발성 유기화합물 (VOCs)의 분해경로를 결정하는데 있어서 중요한 변수이다. 생물분해 변수로서 동역학강수는 VOCs의 생물 정화법의 설계나 모델링하는데 중요한 역할을 한다. 본 연구는 호기성과 혐기성 조건에서 VOCs의 동역학상수를 비교조사하는 것이 주 목적이다. TCE를 기준으로 한 표준화된 VOCs의 속도상수 비교결과, 호기성조건에서 DCM과 CF은 매우 잘 분해되는 VOCs 이었으며, cis 1,2-DCE와 1,1,1-TCA는 상대적으로 늦게 분해되었다. Determination of biokinetic constant for volatile organic compounds (VOCs) is important because the biokinetic constants as biodegradation parameters play an significant role in mathematical design and modeling of bioremediation of VOCs. The objective of this study was to compare biokinetics of VOCs under aerobic and unaerobic conditions. After comparison of normalized k for VOCs on the basis of trichloroethylene(TCE) with methanotrophs, dichloromethane(DCM) and chloroform(CF) were very well degraded hydrocarbons whereas cis 1,2-DCE and 1,1,1-TCA were poorly degraded hydrocarbons under the aerobic conditions.

7종 형광체 스펙트럼 조합과 Blue LED의 최고파장 및 반치전폭 변화에 따른 S/P Ratio와 연색특성 시뮬레이션 연구

김종오,류우찬 한국조명.전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.5

Recently, interest in convenience facilities for road safety and urban aesthetic conditions increased needs to improve visibility and color recognition of night road lightings. To meet the needs, scotopic/photopic (S/P) ratio and color rendering properties, such as color rendering index (CRI), color fidelity (Rf), color gamut (Rg), and color quality scale (Qa) should be considered for outdoor lighting products. It is well known that S/P ratio and CRI are in trade-off relation and, therefore, it is important to optimize them to certain levels through color combinations. In this paper, optimization of phosphor converted LED with a blue LED and 7 phosphors was performed by simulation of changing peak wavelength and full width at half maximum (FWHM) of a blue LED with combinations of 7 phosphors. The results showed that color rendering properties of Ra≥82, R9~14≥76, R9~12≥82, Qa≥95, Rf≥89, Rg≥100, and S/P ratio values were increased by 0.29∼0.61 and 0.22∼0.5 compared to those of the typical warm white LED and cool white LED suggested in the IES (Illuminating Engineering Society) TM (Technical Memorandum) 12-12.

화력발전소 보일러 튜브 손상해석 ( Failure Analysis of Boiler Tube for Fossil Power Plant )

김종오,박민수,전채흥,박기성,김승태 대한기계학회 1999 대한기계학회 춘추학술대회 Vol.- No.-

지연유합과 불유합에서 저신호 강도 초음파의 유용성

김종오,정준모,최창호,윤여헌,고영도,유재두,방한천,신명철,오종건 대한골절학회 2003 대한골절학회지 Vol.16 No.1

목 적 : 저 신호 강도 초음파를 이용한 지연유합과 불유합의 치료에 대한 유용성을 알아보고자 하였다.대상 및 방법 : 2001년 7월부터 2 0 0 2 년 5월까지 본원에 내원한 지연유합 7례와 불유합 8례를 대상으로5개월간 저 신호 강도 초음파로 치료하여 5개월후 골유합 여부를 알아 보았다. 결 과 : 총 1 5례 중 대퇴골 간부 2례, 경골 간부 1례, 상완골 간부 1례, 요골 1례의 지연유합에서 골유합을 얻었고 대퇴골 간부 불유합 3례에서 유합을 얻었다. 지연 유합은 7 1 % 의 유합율을, 불유합은3 7 . 5 % 의 유합율을 보였다.

액상유기성슬러지로부터 용존유기물의 회수를 위한 막결합형 발효 시스템의 여과 특성

김종오 한국막학회 2003 멤브레인 Vol.13 No.2

본 연구는 액상유기성 슬러지로부터 용존 유기물을 회수하기 위한 막결합형 발효 시스템의 여과특성의 검토에 초점을 두었다. 0.1 m~5 m 범위에서 6종류의 막공경을 대상으로 한 슬러지 발효액의 정밀여과 특성으로 막공경이 작을수록 전체저항이 큰 값을 나타내었고 케잎층의 형성에 의한 저항이 전체저항의 68~88%를 차지하여 막투과유속의 저하는 주로 입자간의 물리화학적 상호작용에 의한 막표면에의 강한 입자침전에 기인함을 알 수 있었다. 발효액의 고형물 농도가 증가함에 따라 막투과유속은 감소하였으나 일정이상의 고형물 농도에서는 비례관계를 보이지 않았다. 막면유속이 증가할수록 그리고 5.0~6.0의 pH범위에서 높은 막투과유속이 얻어졌고 에너지 효율측면에서는 가능한 낮은 압력에서 여과하는 것이 유리한 것으로 나타났다. 0.1 m과 0.2 m의 막공경에서는 100%의 미생물 제거율을 보였다. 액상 유기성 슬러지로부터 용존 유기물을 효율적으로 회수하기 위한 최적 막공경은 제안된 기준의 관점에서 볼 때 1 m 정도라 판단되어진다. This study was focused on the investigation of filtration characteristics of membrane-coupled fermentor system for dissolved organics recovery from liquid organic sludge. On the filterability of MF over the range of 0.1~5 m, the magnitude of total membrane resistance (Rt) is ranged as follows in the order; 0.1 m>0.2 m>0.5 m>1 m>2 m> 5 m. The cake layer resistance (Rc) occupied about 68~88% of total resistance with fermented sludge. Permeation flux decline was mainly attributed to the Rc, which was formed by a strong deposition from physico-chemical interactions of solids on membrane surface. Higher suspended solids (SS) concentration of suspension caused lower permeation flux. However, there was not a proportion relation beyond a certain SS concentration. The cross-flow velocity on the membrane surface was faster, which resulted in the higher permeation flux and also more efficient with low trans membrane pressure (TMP) in viewpoint of energy efficiency. The appropriate pH of suspension was over the range of 5.0~6.0 for dissolved organics recovery as well as the permeation flux. It is possible for bacteria to be separated perfectly with 0.1 m and0.2 m membrane pore size. Based on experimental results, most appropriate membrane pore size for the recovery is believed to around 1 m.

소아 상완골 외과골절의 치료분석

김종오 대한골절학회 1996 대한골절학회지 Vol.9 No.3

The author have analyzed clinical and radiological materials of fourty-five patients of lateral condylar fracture of the humerus who have been treated with close reduction and percutaneous pinning after arthrogram, open reduction and internal fixation and followed up for more than 6 month since September, 1993. If the fracture is incomplete will not be displaced after varus and valgus stress. Also We have checking arthrogram of reduction state, we have treated with close reduction and percutaneous pinning. If the fracture is complete the fragment may be displaced and open reduction with internal fixation is mandatory, the following results were obtained: l. Age at diagnosis was 5.7 years in average ranging from two years to twelves years. thirty-three out of fourty-five children(73.3%) were male to reveal definite male prepoderance. 2. As for Milch type classification, three cases(5%) were of type I and fourty two cases(95%) were of type 1. According to Jakobs staging of displacement, 7 cases were of stage I, 25 cases were of stage I, and 13 cases wen of stage g . 3. The open reduction were indicated as follows: Jak obs stage I unreduced, postinjury 48 hours relapsed, Jakob stage III. The closed reduction were indicated as follows: Jakobs stage I, II. Badelon type I, II and undisplaced and reduceable with supination-valgus stress view, arthrogram. 4. The average period of postoperative cast immobilization was 4weeks. active and gentle passive motion exercises were instituted thereafter. 5. The range of change in carrying angle was not influenced by degree of fragment displacement and method of treatment. 6. The complications were lateral condylar overgrowth(6 cases) and avascular necrosis(1 case). 7. The result of the treatment classified according to Hardacre assessement, were excellent in thirty one cases(69%), good in thirteen cases(29%), poor in and case(2%). In conclusion, the closed reduction and internal fixation with arthrogram. is considered as the treat- ment of choice for the minimally displaced lateral condylar fractures of the humerus in children.

한국 성인 남자에서 원위 경비골 결합의 단순 방사선학적 판정기준에 관한 연구

김종오,최형연,유용환 대한골절학회 1995 대한골절학회지 Vol.8 No.3

The ankle joint is the hinge joint composed of distal tibiofibula, talus and ligaments. Fractures of ankle joint are frequenty associated with ligaments ruptures and especially, as diastasis of ankle joint was easy to be overlooked, patients suffered form the pain and disability of ankle joint. Therefore, diastasis of ankle joint should be accurately diagnosed and properly treated. To obtain this goal, thorough understanding of diastasis and clear-cut diagnostic guide are important. For evaluation of differences between foreigners and Korean, authors measured the radiologic criteria for evaluation of the 100 Korean men from February 1995 to July 1995. The results obtained for this study were as follows. 1. Syndesmosis A: This is a measurement of the tibiotibular clear space form the lateral border of the posterior tibial malleous on anteroposterior(A.P.) radiograph. In Korean men, average measurement was 3.74mm+ 0.66mm. 2. Syndesmosis B: This is a measurement of the overlap form the medial border of the fibula to the lateral border of the anterior tibial prominence on A. P. radiograph. In Korean men, average measurement was 8.82mm+ 1,93mm, 3. Talocrural angle: This angle is formed by a line perpendicular to the distal tibial articular surface and a line joining the tips of both malleoli on the mortise view. In Korean men, average measurement was 77.51°±4.94°. 4. Medial clear space; This is the distance from the lateral border of the medial malleoulus to the medial border of the talus at the level of the talar dome on the mortise view. In Korean men, average measurement was 3.37mm±0.66mm. 5. Talar tilt: This angle is formed by a line drawn parallel to articular surface of the distal tibia and second line drawn parallel to the talar surface. In Korean men, average measurement was 0.37° ± 0.68°. To analyze the these results, syndesmosis A, medial clear space, and talar tilt were similar to foreigners and Korean men, but syndesmosis B and talocrural angle were lower value in Korean men than in froeigners.

대퇴골 전자간 골절의 압박고 나사 고정 후 발생한 고정실패

김종오,장상열,문준규,정훈,정우철 대한골절학회 2003 대한골절학회지 Vol.16 No.3

목적: 압박고 나사를 이용한 전자간 골절의 수술적 치료 후 발생할 수 있는 고정실패에 영향을 줄 수 있는 인자들을 분석하고자 한다. 대상 및 방법: 1996년 2월부터 2001년 2월까지 본원 정형외과에서 압박고 나사를 이용하여 수술한 전자간 골절 환자 중 6개월 이상 추시가 가능하였던 79명을 대상으로 하였다. 고정실패는 12례였으며, 고정실패에 관여할 것이라고 기대되는 다음 인자들에 대하여 분석하였다; modified Evans 분류, Singh 지수, 대퇴 골두내 나사의 위치, 골절의 정복양상, 이 인자들을 chi square test를 이용하여 통계적으로 분석하였다. 결과: 나이와 연령은 통계적인 차이를 보여주지 못했다 (p>0.05). 골절의 안정성을 기준으로 나눈 두 군데에서는 의미있는 빈도의 차이를 보여주었다 (p<0.05). 대퇴 골두내 나사못의 상방위 치한 경우와 골절의 수술적 정복 후 전후 사진상 5㎜ 이상 전위된 경우에도 의미있는 차이를 보여주었다 (p>0.05). 결론: 나이, 성별, Singh 지수는 고정실패에 영향을 주지 않았다. 고정실패에 영향을 주는 요소는 다음과 같다고 사료된다; 나사못의 골두내 상바위치, 불안정한 골절양상, 골절의 수술적 정복 후 방사선 전후 사진에서 보이는 5㎜ 이상의 피질골의 전위. Purpose: To evaluate the factors which might affect the loss of fixation after surgical treatment of intertrochanteric fracture with compression hip screw. Materials and Method: From February 1996 to February 2001, seventy nine cases of intertrochanteric fracture which we operated with compression hip screw was reviewed with minimal follow up for 6 months. There were twelve cases of loss of fixation. The cases were analyzed according to each factors which we thought to affect the loss fixation. The factors are fracture type by modified Evans classification, Singh index, placement of screw in femoral head, quality of reduction. Then we analyzed these factors with chi square test. Result: Difference between age group and sex were not thought to be statistically meaningful factors (p>0.05). There were difference of prevalence between two group divided by fracture stability (p<0.05). In cases of superior placement in femoral head, there were more loss of fixation. Displacement of cortex of proximal femur of radiologic AP view other than laterial view showed meaningful difference (p<0.05). Conclusion: Age, sex, Singh index did not affect the loss of fixation. But, next factors as follows affected the loss of fixation; Superior placement of hip screw, unstable fracture pattern, displacement of fracture site more than 5㎜ after reduction on radiologyc AP view.

거골 경부 골절의 단기간 추시 결과

김종오,윤여헌,김동욱,고영도,유재두,조중호,Kim, Jong-Oh,Yun, Yeo-Hun,Kim, Dong-Wook,Koh, Young-Do,Yoo, Jae-Doo,Cho, Choong-Ho 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.1

Study design: Clinical results were retrospectively analyzed in 11 patients with fractures of talar neck who were treated in our department from Jan. 1994 to Dec. 1999. Objective: The purpose of this study is to evaluate the short-term results and to assess the prognostic factors of talar neck fractures. Material and Method: 11 cases with fractures of talar neck were reviewed retrospectively with minimum 1 year follow-up. There were 8 men & 3 women, and the average age was 25. The most common cause was traffic accident. According to the modified Hawkins classification, type I was in 4 cases, type II in 5, type III in 2, and type IV was none. All type I fractures were treated conservatively, and others were treated operatively. Results: According to Hawkins criteria, there was excellent result in 7 cases(64%), good in 2(18%), and fair in 2(18%). Post-traumatic arthritis occurred in 2 cases, but there was no avascular necrosis. Conclusion: Careful selection of method of treatment and urgent management are important prognostic factors in talar neck fractures. The longer follow-up in more cases is necessary to evaluate the long-term clinical results and complications more accurately.

중력파(重力波)의 우주논적(宇宙論的) 의의(意義)

김종오,Kim, Jong-O 한국천문학회 1969 Journal of The Korean Astronomical Society Vol.2 No.1