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이정렬,정원용,박영석 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-
본 논문에서는 프렉탈 부호화 속도를 개선하기 위해 DCT(discrete cosine transform)를 이용한 유사 블록 제거 알고리즘을 제안한다. 이 알고리즘은 DCT 변환계수의 평균값과 분산값의 유사도에 따라 유사블록들을 찾아 제거한다. 이 접근법은 부호화를 위한 정의역(domain)과 치역(range)를 줄임으로써 프랙탈 부호화 처리 속도를 개선한다. 알고리즘의 유효성을 확인하기 위해 정의역 블록만 제거시키는 경우 그리고 치역과 정의역 블록을 함께 제거시키는 경우 각각에 대한 실험을 행하고 기존의 프랙탈 블록 부호화 방법과 부호화 속도와 복원이미지의 PNSR을 비교한다. 실험결과 PNSR이나 시각적으로 큰 손실없이 부호화 속도를 약 20%정도까지 개선시킬수 있었다. In this paper, we propose a similar block removal a1gorithm using DCT(discrete cosine transform) to improve the fractal encoding speed. The proposed algorithm removes similar blocks depending to the similarity of the average and variance of the DCT transformed coefficients. This approach improves the fractal encoding speed by reducing the domain and range blocks for encoding. We perform an experiment for both the case of removing only domain and the case of removing together the range and domain to show the effectiveness of the algorithm. The experimental results show that the encoding speed is improved up to about 20% with a little PNSR and visual loss
류광열,강원식,김영호,장해동,홍진태,유환수,윤여표 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
The purpose of this study was to determine the antioxidative effects of Rhodiola sachalinensis Rhodiola methanol extract was fractionated sequentially with dichloromethane and butanol. Each Rhodiola fraction (water, MeOH, BuOH and CH_2Cl_2 fractions) showed the potent superoxide dismutase (SOD) activity, and had inhibitory effets on peroxide value of linoleic acid (40~57%) and lipid peroxidation (47~70%) in FE^2+/ascorbate system-induced rat liver microsome. Rhodiola methanol extract also recovered carbon tetrachloride-induced decrease in SOD by 42% and catalase activities by 50%, and had inhibitory effects (54%) on carbon tetrachloride-induced lipid peroxidation in rat liver microsome. These results suggest that Rhodiola sachalinensis has the antioxidative effects.
박종탁,류원율 대구보건대학 2005 대구보건대학 論文集 Vol.25 No.-
For the effective treatment of dyeing-complex wastewater, the most effective chemical coagulation were studied. For the chemical coagulation of dyeing-complex wastewater, polysulferiron(Ⅱ), Al_(2)(SO_(4))_3, PAC, ferrus sulfate, ferric sulfate, FeCl_(2) and lime were used. The ferric sulfate is the most efficient coagulant. The optimal conditions and results for ferric sulfate include the followings. When initial COD_(Mn) concentration was 600mg/L, the optimal initial pH, dosage, dosage of lime and PAA for COD_(Mn) removal efficiency were 4, 1,2000mg/L, 500mg/L and 1mg/L, respectively. The more influent COD_(Mn) concentration was increased, the more dosage of ferric sulfate was increased.
백승,하주원,오희균,유선열,김원재 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.5
This is clinical study on 113 patients who were treated for parotid tumors at Chonnam National University Hospital over a period of 5 years from January 1996 to December 2000. The results were as follows ; The mean ages were 42.6 years old (12∼73 years) for benign parotid tumor patients and 43.9 years old (2∼74 years) for malignant patients. The ratio of male to female was 1:2 in malignant parotid tumors, but there was no difference in benign tumors. There was no difference in mean mass size and duration of illness between benign and malignant tumor patients. The combined usage of fine needle aspiration biopsy and computed tomogram was common as the diagnostic methods of parotid tumor. The parotid tumors were commonly located in the superficial lobe (69%). The ratio of benign and malignant tumors was 4:1. The most common benign tumor was pleomorphic adenoma (72% of benign tumor), followed by Warthin's tumor and monomorphic adenoma. The most common malignant tumor was mucoepidermoid carcinoma (45% of malignant tumor), followed by adenoid cystic carnoma, carcinoma ex pleomorphic adenoma, and adenocarcinoma. The most common operations were superficial parotidectomy (72%) for benign parotid tumor and total parotidectomy (45%) for malignant tumor. The most common postoperative complication was temporary facial nerve weakness (82%), followed by Frey's syndrome (14%) and permanent facial palsy (4%). Postoperative radiation therapy was done in 12 patients (60%) and the mean radiation dose was 5550±620 cGy. Of 113 cases, tumor recurrence developed in 12 cases (10%). These results suggest that the successful management of parotid gland tumors needs adequate surgical treatment on the basis of knowledge of parotid gland anatomy and preoperative diagnosis.
광중합 복합레진의 색안정성 및 투명도변화에 관한 가속시험
황인남,오원만,류선열 전남대학교 치과대학 1992 전남치대논문집 Vol.4 No.1
Color stability of tooth colored restorative resins is an important factor, particularly in anterior teeth restoration. The purpose of this study was to evaluate the color stability and opacity change of several light curing composite resins. Specimens of eight composite resins(Prisma AP.H, Brilliant Enamel, Charisma, Durafil, Helio Progress, Herculite XR, P-50 and Silux Plus) were divided into two groups : In Group 1, the specimens were polymerized by visible light curing unit for 60 seconds on both sides and in Group 2, the post-cured specimens were heat tempered by light/heat curing unit for 45 units(about 18 min.). All specimens were stored in distilled water at 60℃ for 30 days. The color characteristics(L^*, a^*, b^*) and opacity of the specimens before and after immersion were measured by spectrocolorimetry and the total color difference(ΔE^*) and opacity change(ΔY%) were computed. The results obtained were as follows: 1. SP and APH in both groups, DF, HP and HXR in Group Ⅰ showed ΔE^*-value above 2.0. 2. DF, HP, SP and HXR in Group Ⅰ showed higher ΔE^*-value than in Group 2, but the others had no significant difference. 3. The opacity of CH and HXR in Group Ⅰ, and of CH and BE in Group 2 decreased after immersion, while that of the others increased. 4. Opacity change of BE, P50 and HXR was significantly different between Group Ⅰ and 2. These results suggest that color change in the post-cure heat tempered specimens by light/heat curing unit was smaller than that of the specimens polymerized by visible light curing unit. No clinically detectable opacity changes were noted for any materials in either group.
강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2
Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.
하악골 결손부의 골형성에 미치는 Bioplant HTRⓡ의 영향
최도현,유선열,김옥준,허원실 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.1
The present study was performed to investigate the effect of HTR□ (Hard Tissue Replacement) on osteogenesis in the mandibular bone defects. Eight adult male white rabbits weighing 2.5 to 3.0kg were used. Four bone defects (8mm in diameter and 4mm in depth) were made at the both mandibular body. In the control group, the right mesial bone defect was filled with blood clot and spontaneously healed, In the DFDB group, the right distal bone defect was filled with xenogenic demineralized freeze-dried bone. In the HTR□ group, the left mesial bone defect was filled with HTR□. In the HTR□-membrane group, the left dis- tal bone defect was filled with HTR□ and covered with BioMesh membrane. The rabbits were sacrified at 2,4,6 and 9 weeks after the operation and microscopic examination was performed. Results obtained were as follows: In the control and DFDB groups, inflammatory cells and the fibrous connective tissue existed and the bone growth was slower than HTR□ group by 6 week, and there was intervention of the soft tissue at 9 week. In the HTR□ group, bone trabeculi extended between the HTR□ particles without intervention of inflammatory cells and the connective tissue at 4 and 6 weeks. In addition, extensive osseous ingrowth into the HTR□ particles was observed at 9 week. Bone formation was more active in the HTR□ group than the control and DFDB groups. There was not obvious difference in the bone healing rate between the HTR□ and the HTR□-membrane group. These results suggest that the HTR□ promotes osteogenesis in the bone defects and the HTR□ group has no difference in comparison with the HTR□-BioMesh□ membrane group in bone healing.
백승,오희균,박홍주,유선열,김원재 전남대학교 치의학연구소 2002 구강과학 Vol.14 No.3
This is a clinical study on 113 patients, who were treated for parotid tumors at Chonnam National University Hospital over a period of 5 years from January 1996 to December 2000. The results were as follow, 1. The mean ages were 42.6 years old (12~73 years) for benign parotid tumor patients and 43.9 years old (2~74 years) for malignant patients. 2. The ratio of male to female was 1:2 in malignant parotid tumors, but there was no difference in sex distribution of benign tumor. 3. There was no difference in mean mass size and duration of illness between benign and nalignant tumor patients. 4. The combined use of fine needle aspiration biopsy and computed tomograph was common as the diagnostic method of parotid tumor 5. The parotid tumors were commonly located in the superficial lobe(69%). 6. The ratio of benign and malignant tumors was 4:1. The most common benign tumor was pleomorphic adenoma (72% of benign tumor), followed by Warthin's tumor and monomorphic adenoma. The most common malignant tumor was rnucoeplderrnoid carcinoma(45% of malignant tumor). followed by adenoid cystic carnoma. carcinoma ex pleomorphic adenoma, and adenocarcinoma. 7. The most common operations were superficial parotidectomy (72%) for benign parotid tumor and total parotidectomy (45%) for malignant tumor 8. The most common postoperative complication was temporary facial nerve weakness (82%), followed by Frey's syndrome (14%) and permanent facial palsy (4%). 9. Postoperative radiation therapy was done in 12 patients and the mean radiation dose was 5550±620cGy. 10. Of 113 cases. tumor recurrence developed in 12 cases (10%). These results suggest that the successful management of parotid gland tumors needs adequate surgical treatment on the basis of knowledge of parotid gland anatomy and preoperative diagnosis.
강신몽,이한영,윤중진,이원태,김종열,이영석,서재관,최득린,서지석,이혜경 大韓法醫學會 1992 대한법의학회지 Vol.16 No.1
Individual identification of severely decomposed or skeletonized bodies is an important part in medicolegal field. 142 bodies were torn up and carried away by flood in a park cemetry, Kwang-Ju, Kyunggi province, Korea at Sept., 10, 1990. The authors examed the 56 bodies, which were gained, through medical, anthropological, odontological, radiological methods, and superimposition for individual identification. Among them, 41 cases were successfully identified, and remaining 15 cases were not identified because of sever destruction and no adequate information.