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Carbon Black이 시멘트 Paste 및 Mortar의 물리적 특성에 미치는 영향
홍원표,황의환,조헌영 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2
This study was performed to determine the most desirable carbon black and it's content in ordinary porland cement for the increase of physical properties of the cement and mortar. The various contents of carbon black were used for this study such as 0.2wt%, 0.5wt%, 1.0wt% and 3.0wt%. The different particle size and structure of carbon black were used. The physical properties of the cement paste and mortar were tested by KS methods. The experimental results are as follow; 1) The contents of 0.5-1.0wt% carbon blacks in cement increased most apparently the setting time of cement paste, flow value, compressive and flexural strengths of mortar, whereas decreased the water absorption ratio of mortar by about 10%. 2) SNP and D company's carbon black which have smaller numbers of I₂adsorption and DBP absorption and heavier pour density than those of others showed to be the most effective carbon blacks. 3) The soundness of cements remained unchanged regardless to the different kinds and contents of carbon blacks.
自生的 商業空間의 立地決定要因 分析 : 江陵市 事例를 中心으로 The Case of Kang Reung
崔昌儀,陳元亨 강릉대학교 영동산업문제연구소 1987 産經論叢 Vol.7 No.-
The study on the urban commercial activity contributes to the understanding of the internal structure and spatial order of the city. This study is to find causal relations and rules that have an effect upon commercial locations in the case of Kang Reung City which is a kind of spontaneous space. The results of empirical study are summarized as follows. (1) Stores that are located according to the factor of consumer flows are movie theaters, game rooms and drugstores. Movie theaters and game rooms are located along the arterial road with more pedestrian flows. Drugstores have propensity to repulse themselves strongly and be located at the corner. (2) Restaurants, coffee shops, cafe´s and billiard rooms are located according to the factors of store image. Restaurants show a strong affinity which leads to the grouping tendencies at a quiet alley. Coffee shops and cafe´s prefer underground location though billiard rooms prefer the second or third floor. (3) As clothes shops, shoes shops and furniture shops are located according to the factor of consumer's shopping habit, they then to concentrate together in the shopping street and prefer corner sites. On the other hand, they avoid visual obstacles such as groceries and restaurants. (4) Groceries and clothes shops in the vicinity of the traditional market, and complex commercial facilities are located according to the factor of consumer's multipurpose shopping trip. (5) Printing shops and hawkers are located in terms of the functional association with neighboring facilies such as office sector and traditional market.
Ui Do Yeo,성낙송,노승재,Won Jun Choi,Kyung Ho Song,In Seok Choi,윤대성,Sang Eok Lee,문주익,권성욱,In Eui Bae,Seung Jae Lee 대한내시경복강경외과학회 2020 Journal of Minimally Invasive Surgery Vol.23 No.3
Purpose: In colorectal cancer surgery, it is important to have accurate resection margins. But, there is difficulty to find lesions in laparoscopic surgery. To reduce surgical errors, many preoperative localizing methods have been introduced. In this study, we aimed to assess the preoperative feasibility and safety of autologous blood tattooing. Methods: From August 2017 to February 2020, a total of 11 patients underwent preoperative colonoscopic autologous blood tattooing. At the start of surgery, the surgeon assessed for the presence of visibility and other complications such as abscess or spillage. The characteristics of patients, outcomes, and complications were collected retrospectively. Results: The study comprised 8 men and 3 women, with an average age of 63 years. Except for one imprecise patient during the surgery, all other 10 patients showed precise visibility, and no localization errors were observed. No complication was observed in all patients. Conclusion: Preoperative autologous blood tattooing is a very useful and safe technique because it has high visibility and no complications. This method does not require additional agents or facilities. Large scale study will be required for standard guidelines.
Ui jeong Yun,Hyesun Jung,Kye Won Park,Ki-Moon Park 한국버섯학회 2017 한국버섯학회지 Vol.15 No.3
The objective of this study was to determine the anti-diabetic effect of the water extract of Neolentinus lepideus in a diabetic mouse model. Seven-week-old C57BL/KsJ-db/db mice were fed either a control diet (CD) or diet supplemented with 1% or 5% of N. lepideus water extract (NLWE1 or NLWE5) for 10 weeks. Oral administration of NLWE significantly decreased the body weight gain compared to that of CD-fed group. Mice in the NLWE group had significantly lower levels of fasting serum glucose, fatty acids, and low-density lipoprotein cholesterol compared to those in the control group. These effects were accompanied by reduced fatty liver and improved glucose tolerance in the NLWE group. Taken together, these results suggest that N. lepideus might have potential as a dietary supplement to control diabetes.
Ui Gyeong Hwang,Kyomin Kim,Woo Chul Kim,신원호,Won-Seon Seo,임영수 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
We report the thermoelectric transport properties of interface-controlled p-type bismuth antimony telluride (BST) compositesusing reduced graphene oxide (rGO). The composites were prepared by the spark plasma sintering (SPS) of BST–grapheneoxide (GO) hybrid powder, which could induce the in situ reduction of GO into rGO. Compared to the pristine BST, theinterface-controlled BST composites exhibited degraded electrical conductivities with similar Seebeck coefficients, consequentlyresulting in decreased power factors. However, thanks to the suppressed lattice thermal conductivity by the rGOnetwork at the grain boundaries, this disadvantage could be compensated in terms of ZT. Our results will be helpful forunderstanding thermoelectric transport properties of various graphene-hybrid thermoelectric materials.
A hybrid technique for sinus floor elevation in the severely resorbed posterior maxilla
Ui-Won Jung,Ji-Youn Hong,이중석,김창성,조규성,최성호 대한치주과학회 2010 Journal of Periodontal & Implant Science Vol.40 No.2
Purpose: This study aimed to evaluate the effectiveness of the modified sinus floor elevation technique described hereafter as a “hybrid technique,” in 11 patients with severely resorbed posterior maxillae. Methods: Eleven patients who received 22 implants in the maxillary premolar and molar areas by the hybrid technique were enrolled in this study. A slot-shaped osteotomy for access was prepared on the lateral wall along the lower border of the sinus floor. The Schneiderian membrane was fully reflected through the lateral slot. Following drilling with the membrane protected by a periosteal elevator, the bone was grafted. All implants were placed simultaneously with sinus augmentation. The cumulative success rate was calculated and clinical parameters were recorded. Radiographic measurements were performed. Results: All implants were well maintained at last follow up (cumulative success rate=100%). The mean residual bone height, augmented bone height, crown-to-implant ratio, and marginal bone loss were 4.1±1.64 mm, 8.76±1.77 mm, 1.21±0.33 mm, and 0.34±0.72 mm, respectively. Conclusions: Simultaneous implant placement with sinus augmentation by hybrid technique showed successful clinical results over a 2-year observation period and may be a reliable modality for reconstruction of a severely resorbed posterior maxilla. Purpose: This study aimed to evaluate the effectiveness of the modified sinus floor elevation technique described hereafter as a “hybrid technique,” in 11 patients with severely resorbed posterior maxillae. Methods: Eleven patients who received 22 implants in the maxillary premolar and molar areas by the hybrid technique were enrolled in this study. A slot-shaped osteotomy for access was prepared on the lateral wall along the lower border of the sinus floor. The Schneiderian membrane was fully reflected through the lateral slot. Following drilling with the membrane protected by a periosteal elevator, the bone was grafted. All implants were placed simultaneously with sinus augmentation. The cumulative success rate was calculated and clinical parameters were recorded. Radiographic measurements were performed. Results: All implants were well maintained at last follow up (cumulative success rate=100%). The mean residual bone height, augmented bone height, crown-to-implant ratio, and marginal bone loss were 4.1±1.64 mm, 8.76±1.77 mm, 1.21±0.33 mm, and 0.34±0.72 mm, respectively. Conclusions: Simultaneous implant placement with sinus augmentation by hybrid technique showed successful clinical results over a 2-year observation period and may be a reliable modality for reconstruction of a severely resorbed posterior maxilla.