연구논문 : CMAQ 모델의 화학메커니즘(SAPRC99, CB05) 적용에 따른 수도권 오존농도 모의결과 비교

강윤희 ( Yoon Hee Kang ),오인보 ( In Bo Oh1 ),정주희 ( Ju Hee Jeong ),방진희 ( Jin Hee Bang ),김유근 ( Yoo Keun Kim ),김순태 ( Soon Tae Kim ),김은혜 ( Eun Hye Kim ),홍지형 ( Ji Hyung Hong ),이대균 ( Dae Gyun Lee ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.1

A comparison of ozone simulations in the seoul metropolitan region (SMR) using the community multiscale air quality (CMAQ) model with SAPRC99 and CB05 chemical mechanisms (i.e. EXP-SP99 and EXP-CB05) has been conducted during four seasons of 2012. The model results showed that the differences in average ozone concentrations between the EXP-SP99 and EXP-CB05 were found to be large in summer, but very small in the other seasons. This can be attributed that the SAPRC99 tends to produce more ozone than the CB05 in urban area like the SMR with low VOC/NOx ratio under high ozone conditions. Through quantitative comparison between two mechanisms for the summer, it was found that the average ozone concentrations from the EXP-SP99 were about 3 ppb higher than those from the EXP-CB05 and agreed well with the observations. Horizontal differences in ozone concentrations between SAPRC99 and CB05 showed that significant differences were found in southern part of the SMR and over the sea near the coast in summer.

구내 신연장치를 이용한 치조골 신연에 미치는 잠복기의 영향

오유근,오희균,유선열 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.4

The present study was aimed to investigate the effects of latency period on alveolar ridge distraction using the intraoral distraction device, Nine adult mongrel dogs of either sex, weighing about 15kg, were used. They were divided into 3-day, 5-day, and 7-day groups according to the latency period. The left upper and lower premolars and first molars were extracted, Twelve weeks after the extraction, an osteotomy was performed and the distraction device was applied. After the latency period, the distraction was applied at a rate of 1.2mm for 8 days. The distraction device was left in place for 2 weeks to allow consolidation and was then removed. The animals were sacrified at 8 weeks after completion of distraction and were examined macroscopically, radiographically, and histologically. After completion of the distraction, the alveolar crest protruded prominently, showing the vertical augmentation of the alveolar bone. Soft tissues were broken down after the 6th day of distraction in 3-day latency group, and premature union occurred on the 7th day of distraction in the 7-day latency group. The average distance was 9.40±0.3mm in 3-day latency group, 9.35±0.1mm in 5-day latency group, and 8.85±0.1mm in 7-day latency group. In the radiograph taken at 8 weeks after distraction, there was slight bone resorption around the medial and distal edges of the alveolar bone segment, and a new bone deposition was observed in the neighboring alveolar crest area in all groups. Fibrous tissues were present in a part of the buccal cortical bone area of the distraction gap, and the woven and lamellar bones were observed in the distracted gap. There were bony bridges in the distraction gap in all animals examined. These results suggest that optimal time of latency period on alveolar ridge distraction using the intraoral distraction device is about 5 days in dogs, and about 7days in human beings.

Sol-Gel법으로 제조된 PZT Thin Film

오지현,권근희,김남철 공주대학교 생산기술연구소 2002 論文集 Vol.10 No.-

This paper presents ferroelectric Pb(Zr_0.52Ti_0.48)O_3 (PZT) thin film by sol-gel synthesis with metal-organic precursors. Sol-gel reaction sequences with metal-organic precursors were confirmed through DTA and FT-IR measurements and perovskite phase formation was investigated by rapid thermal annealing technique. The structural and morphological properties of PZT thin film were investigated by XRD and SEM. Perovskite phase PZT single phase was appeared at temperature of 650 ℃ and the second phase, pyrochlore, was decreased as increasing the annealing temperature, which was clearly indicated by investigating the size of 'rosette structure' and pyrochlore phases at different annealing temperatures. The P-E loop measurement indicated the relation of the applied voltage vs. domain alignments in the PZT thin film system.

중·고등학교 아랍어 교재 집필 및 교재 내용에 관한 연구 보고서

오명근,송경숙,전완경,사희만,이규철,조희선,정규영,최진영 한국아랍어아랍문학회 1999 아랍어와 아랍문학 Vol.3 No.1

Sandblasted large grit, acid etched 표면처리에 따른 교정용 미니 임플랜트의 제거회전력에 관한 연구

오남희,김성훈,국윤아,이근혜,강윤구,모성서 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.5

Sandblasted large grit, acid etched(SLA) 표면처리 된 교정용 미니 임플랜트와 평활면을 가진 교정용 미니 임플랜트 사이에 제거회전력과 조직학적 소견을 통해 표면처리된 교정용 임플랜트의 임상적 가능성에 대하여 알아보고자 하였다. 실험재료로는 길이가 9.5 mm, 외경이 1.8 mm인 custom made, screw shaped, titanium implants가 사용되었다. 미니 임플랜트는 두개의 군으로 분류되었는데 SLA군은 20개의 SLA 표면처리된 미니 임플랜트이었고, 평활면군은 크기와 형태가 같지만 SLA처리공정이 생략되어 제작된 20개의 미니 임플랜트로 구성되었다. 이들은 10마리 가토의 경골에 식립되었다. 각각의 가토의 우측 경골에는 SLA군의 미니 임플랜트 2개가 식립되었고, 좌측 경골에는 평활면군의 미니 임플랜트 2개가 식립되었다. 각 군에는 식립 직후 Ni-Ti coil spring에 의해 약 150 g의 지속적인 견인력이 주어졌다. 식립 6주 후에 10마리의 가토를 희생하였고, 안정된 상태에서 Ni-Ti coil spring을 제거하였으며 digital torque gauge를 이용하여 제거 회전력을 측정하였다. 식립 6주 후에 SLA군의 경우 (8.29 Ncm) 평활면군 (3.34 Ncm)에 비해 더 높은 평균 제거회전력을 나타내었고 조직학적 소견에서도 screw 하방에서의 신생골 형성이 관찰되었다. SLA 표면처리된 미니 임플랜트는 평활면 미니 임플랜트에 비해 좀 더 강한 교정력에 저항할 수 있을 것으로 예상되었다. Objective: The purposes of this study were to evaluate the differences between sand blasted, large grit and acid-etched (SLA) treated mini-implants and smooth surface orthodontic mini-implants in relation to the removal torque as well as the histologic analysis. Methods: Custom-made, screw-shaped, titanium implants with a length of 9.5 mm and an outer diameter of 1.8 mm were divided into 2 groups; the SLA group (20 SLA treated orthodontic mini-implants) and the smooth surface group (20 smooth surface mini-implants), and placed in the tibia metaphysis of 10 rabbits. Each rabbit had 4 mini-implants placed, 2 in each tibia. The right tibia were implanted with the SLA group mini-implants and the left tibia had the smooth group mini-implants placed. Each mini-implant group were immediately applied with a continuous traction force of 150 g using a Ni-Ti coil spring. The rabbits were sacrificed 6 weeks post-surgically. Subsequently, the legs were stabilized, the Ni-Ti coil springs were removed and the mini-implants were removed under reverse torque rotation with a digital torque gauge. Results: 6 weeks after placement, the SLA group presented a higher mean removal torque value (8.29 Ncm) than the smooth group (3.34 Ncm) and histologic analysis revealed a higher new bone formation aspect along the screw in the SLA group. Conclusion: Results of this study indicates that SLA treated mini-implants may endure higher orthodontic forces without loosening.

중등교사임용시험 ‘생물’ 교과내용학 문항 평가내용요소별 분석 : - 2005〜2014학년도를 중심으로

안근재 오홍식 강경희 부산대학교 사범대학 과학교육연구소 2014 교사교육연구 Vol.53 No.1

The purpose of this study was to analyze problems related biology subject contents knowledge for secondary school teacher certification examination conducted from the school years 2005 to 2014. Research method was applied the quantitative method according to frequency analysis of evaluation scope and evaluation content item. The framework of analysis was based on the evaluation scope of the biology subject content knowledge and evaluation contents items. The results of analysis showed that the evaluation scope of the biology subject content knowledge and evaluation contents items were more divided than those of other subjects. There was significant difference among ratios of the contents covered in certification examination according to biology subject domains. Also the frequencies of issued the tests were showed 57% of evaluation contents items related to problems of the tests. The results of this study showed that secondary school teacher certification examination was not effective in aspect of balance of evaluation scope and evaluation content item. The results suggest the need for comprehensive reviewing about the evaluation scope of the biology subject content knowledge and evaluation contents items in the basis of trend analysis in biology subject contents knowledge for secondary school teacher certification examination. Key words: secondary school biology teacher certification examination, biology subject contents knowledge 이 연구의 목적은 2005학년도부터 2014학년도까지 중등교사임용시험의 생물 교과내용학 문항을 분석하는 것이다. 분석틀은 「생물과 교과내용학 평가 영역 및 평가 내용 요소」를 근거로 했다. 연구 방법으로는 평가영역과 평가내용요소의 빈도 분석에 따른 정량적 방법을 활용하였다. 분석 결과 생물 교과의 평가 영역과 평가 내용 요소는 타교과목에 비해 너무 세분화된 경향을 보였다. 출제 문항 분석 결과 생물과 분야별 출제비중은 큰 차이를 나타내었고, 각 평가 내용 요소별 출제 빈도도 크게 다른 것으로 나타났다. 또한 평가 내용 요소들 중 57%만이 출제문항과 연계되어 출제 내용의 편중성을 보였다. 이는 중등교사임용시험에서 생물 교과내용학 문항들이 평가영역과 평가내용요소의 균형이라는 측면에서 효과적이지 않음을 나타내고 있다. 이와 같은 결과는 향후 중등교사임용시험 생물 교과목에서 평가의 타당성을 확보하기 위해서는 출제 경향 분석을 토대로 평가 영역과 평가 내용 요소 선정에 대한 종합적인 검토가 필요함을 시사하고 있다.

성상세포종에서 등급에 따른 p53 단백 발현의 차이

기근홍,양정원,이승학,이민오,성정희 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1

Background and Objectives: Mutation or inactivation of the p53 is important mechanism in a wide variety of human tumors. The purpose of this study is to investigate the relationship between expression amount of p53 protein and the grade of astrocytic gliomas. Materials and Methods: This study analyzes 40 paraffin-embedded astrocytic glioma, including 10 cases of low grade, 20 cases of high grade, and 10 cases of maligant glioma (glioblastoma multiforme) were used to analyze the status of abnormal accumulation of wild type of p53 protein. The evaluation of the immunostaining result was based on the percentage of positive neoplastic cells. Results: Average positive cell rate of p53 protein were 4.2%, 35.4% and 16.2% in low grade astrocytoma, high grade astrocytoma and glioblastoma multiforme, respectively. Conclusion: p53 gene mutations were correlated with histologic grade of glial tumors. High grade and glioblastoma multiforme showed higher positive cell rate than low grade astrocytoma. These results suggest that the high positive rates of p53 protein is related to the poor prognosis.

광주지역 저소득층 노인의 성별, 연령별 영양상태

노희경,오근애 대한지역사회영양학회 2003 대한지역사회영양학회지 Vol.8 No.3

This study was undertaken to assess nutritional status of the low income elderly residing in Gwangju. Anthropometric data showed that mean height of the subjects was lower than that of korean Standard growth data but weight was similar to that standard value. As the subjects became older, their heights and weights were decreased. Body mass index (BMI) in males and females were 22.9 and 24.4 respectively. However, BMI distribution showed that 56% of the elderly females under 75 were underweight. Advancing age contributes significant difference in triceps skinfold thickness in females (p<0.001). Total cholesterol level was higher in the elderly females than the males. It was found that a considerable number of subjects had anemia determined by hemoglobin and hematocrit level, which indicated un iron deficiency. Twenty-four hour dietary recall revealed that, except for phosphorus and vitamin C, all the nutrient intakes of the subjects were below 75% of Korean RDA. Surprisingly, vitamin A and riboflavin intakes of the elderly were below 50% of Korean RDA. Energy intakes of the elderly males and females were 58.7% and 59.6% of Korean RDA respectively. Unbalanced energy ratios of carbohydrate, protein and fat were noted in both genders. Nutrient intakes of females' were lower than those of males'. Thus, there was a significant gender difference in nutrient intakes. It might be further suggested that an appropriate nutritional program should be developed and implemented to improve the poor nutritional status of the low income elderly living in cities.

자궁경부 상피내병변과 침습성 편평세포 암종에서의 bcl-2 발현양상

성정희,오수섭,기근홍 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.2

Background and Objectives: Squamous cell carcinomas (SCC) of the uterine cervix arise from the carcinoma in situ developed in a field of atypical squamous cell proliferation. So, clinical significance of the cervical intraepithelial neoplasm (CIN) are widely accepted. The purpose of this study is to investigate the oncoprotein changes in the sequence of low-grade squamous intraepithelial lesion (LSIL), high-grade squamous intraepithelial lesion (HSIL), keratinizing type of squamous cell carcinoma (K-SCC) and nonkeratinizing type of squamous cell carcinoma (NK-SCC). Materials and Methods: Immunohistochemical stains for anti-bcl-2 oncoprotein to 120 conized cervical tiussues or resected uterus specimens diagnosed as squamous cell lseions including 30 cases of LSIL, 30 cases of HSIL, 30 cases of K-SCC, and 30 cases of NK-SCC were done. The evaluation of the bcl-2 immunostaining was based on the percentages of the positive neoplastic cells. And statistical analysis of data for the relation between each lesion was performed using the Student t-test. Results: The average positive cell rate was 2.0%, 4.44%, 6.25% and 13.57% in LSIL, HSIL, K-SCC, and NK-SCC, respectively. Statistically, immunoreactive positive cell rate of NK-SCC was significantly higher than those of LSIL (p=0.007) and HSIL (p=0.031). But, there was no significant difference of immunoreactive cell rate between K-SCC and HSIL. Conclusion: These results suggested that bcl-2 may play a role in a cervical tumorigenesis and prognostic relationship with NK-SCC.

Neisseria gonorrhoeae 분리균의 항생제 내성 양상 분석

성원근,정경태,길준영,김석하,오희복 대한감염학회 2001 감염 Vol.33 No.5

Background : The aim of this study was to monitor trends in antimicrobial susceptibilities of Nesseria gonorrhoeae isolates, in particular, to examine the possibility of increasing prevalence of fluoroquinolone resistance in Korea and the relationship between patterns of mutations involving gyrA and parC genes and the ciprofloxacin resistance level. Methods : The antimicrobial susceptibilities of 489 gonoccocal isolates which were nationwide collected from patients visiting Health Centers were determined by NCCLS disk diffusion and agar plate dilution methods. PCR and direct DNA sequencing of the amplicons were performed to identify mutations within the quinolone resistance-determining regions of gyrA and parC genes. Results : The proportion of resistance to penicillin, tetracycline, or both remained as high as 94%. The isolates with ciprofloxacin resistance remarkably increased from 1% in 1999 to 5% in 2000 and also resistance to cefoxitine and ceftriaxone were shown to be increased. The strains resistant to spectinomycin was little reported. Four isolates with 16 ㎍/mL of MIC for ciprofloxacin all showed the same alternations of Ser-91 to Phe, Asp-95 to Gly in GyrA and Ser-87 to Arg in ParC, but ciprofloxacin-susceptible strains have little amino acid substitution. Conclusion : Considering the increasing prevalence of isolates with resistance to ciprofloxacin and ofloxacin, it is likely that the antibiotics such as spectinomycin, or ceftriaxone are recommended as the first-line treatment for gonoccocal infections in Korea. The results from this study suggest that mutation analysis for quinolone resistance-determining regions of gyrA and parC genes are important in epidemiological studies for the spread of ciprofloxacin resistant strains.(Korean J Infect Dis 33:338∼345, 2001)