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Application of Rapid Prototyping Technique and Intraoperative Navigation System for the Repair and Reconstruction of Orbital Wall Fractures

  • Cha, Jong Hyun;Lee, Yong Hae;Ruy, Wan Chul;Roe, Young;Moon, Myung Ho;Jung, Sung Gyun
    • Archives of Craniofacial Surgery
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    • v.17 no.3
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    • pp.146-153
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    • 2016
  • Background: Restoring the orbital cavity in large blow out fractures is a challenge for surgeons due to the anatomical complexity. This study evaluated the clinical outcomes and orbital volume after orbital wall fracture repair using a rapid prototyping (RP) technique and intraoperative navigation system. Methods: This prospective study was conducted on the medical records and radiology records of 12 patients who had undergone a unilateral blow out fracture reconstruction using a RP technique and an intraoperative navigation system from November 2014 to March 2015. The surgical results were assessed by an ophthalmic examination and a comparison of the preoperative and postoperative orbital volume ratio (OVR) values. Results: All patients had a successful treatment outcome without complications. Volumetric analysis revealed a significant decrease in the mean OVR from $1.0952{\pm}0.0662$ (ranging from 0.9917 to 1.2509) preoperatively to $0.9942{\pm}0.0427$ (ranging from 0.9394 to 1.0680) postoperatively. Conclusion: The application of a RP technique for the repair of orbital wall fractures is a useful tool that may help improve the clinical outcomes by understanding the individual anatomy, determining the operability, and restoring the orbital cavity volume through optimal implant positioning along with an intraoperative navigation system.

An Empirical Study on the Variable Rate Deposit Insurance Premium in Korea (변동예금보험료율의 부과에 관한 실증연구)

  • Kim, Dae-Ho
    • The Korean Journal of Financial Management
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    • v.20 no.1
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    • pp.279-304
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    • 2003
  • This study presents some empirical results on variable rate deposit insurance premium in Korea. The study estimates deposit insurance premium for all insured financial institutions in Korea using Ronn and Verma(1986) model which is based on Merton(1977)'s option pricing model. The sample period is 1995-2001 and the study includes trend analysis and cross-sectional analysis for premium estimation. The study also includes the correlation analysis between the estimates and profitability and capitalvariables such as BIS capital ratios, ROE and ROA. The results show that the estimates differ across financial institutions and sample periods. Thus it supports that each deposit premium should reflect its own risks. It also supports the necessity for the system of variable rate deposit insurance premium.

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NUMERICAL INVESTIGATION OF PLUME-INDUCED FLOW SEPARATION FOR A SPACE LAUNCH VEHICLE (우주발사체의 플룸에 따른 유동박리 현상에 대한 수치적 연구)

  • Ahn, S.J.;Hur, N.;Kwon, O.J.
    • Journal of computational fluids engineering
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    • v.18 no.2
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    • pp.66-71
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    • 2013
  • In this paper, the supersonic flows around space launch vehicles have been numerically simulated by using a 3-D RANS flow solver. The focus of the study was made for investigating plume-induced flow separation(PIFS). For this purpose, a vertex-centered finite-volume method was utilized in conjunction with 2nd-order Roe's FDS to discretize the inviscid fluxes. The viscous fluxes were computed based on central differencing. The Spalart-Allmaras model was employed for the closure of turbulence. The Gauss-Seidel iteration was used for time integration. To validate the flow solver, calculation was made for the 0.04 scale model of the Saturn-5 launch vehicle at the supersonic flow condition without exhaust plume, and the predicted results were compared with the experimental data. Good agreements were obtained between the present results and the experiment for the surface pressure coefficient and the Mach number distribution inside the boundary layer. Additional calculations were made for the real scale of the Saturn-5 configuration with exhaust plume. The flow characteristics were analyzed, and the PIFS distances were validated by comparing with the flight data. The KSLV-1 is also simulated at the several altitude conditions. In case of the KSLV-1, PIFS was not observed at all conditions, and it is expected that PIFS is affected by the nozzle position.

A Study on the Use of Complementary and Alternative Therapies in Korean Adults (한국 성인의 보완대체요법 이용에 관한 조사)

  • Lee, Keum Jae;Kim, Ok Hyun;Chun, Woo Jung;Roe, Myung Hee;Kang, Moon Jung;Ko, Sung Hee;Lee, Kyeong Suk;Lee, Ko Eun
    • Korean Journal of Adult Nursing
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    • v.19 no.1
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    • pp.144-154
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    • 2007
  • Purpose: This descriptive study was conducted to identify the use of complementary and alternative therapies, and the perception and attitudes toward CAT in Korean adults. Methods: The 1,010 study subjects were recruited from ten regions in South Korea. Data were collected from July to September, 2004. Results: The 43.2% of the sample(n=436) had an experience of using CAT. The subjects using CAT was more likely to have high score in the CAT perception compared to the subjects with no experience of CAT(p=.001). The primary source of information about CAT was mass media(59.7%). The 52.4% of the sample answered that CAT was supplementary and the 27.7% answered CAT was applicable to chronic pain or musculoskeletal disorders. Subjects(34.8%) pointed out that the greatest problem was no scientific informant in the use of CAT. The primary reason of using CAT was to maintain their health or to prevent disease(44.0%), and the 59.0% of the subjects responded that CAT was effective. Majority of subjects were satisfied with CAT(63.3%) and experienced no side effects of CAT(90.6%). Conclusion: This study suggests that professional counseling and education for CAT is needed for Korean public as well as the research approach to test the effects of CAT.

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The Impact of Ownership Structure on the Operating Performance of Ship Financial Institutions (선박금융기관의 소유구조와 경영성과 분석)

  • Ji, Moonjin;Lee, Kihwan;Kim, Kanghyeok
    • Journal of Korea Port Economic Association
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    • v.30 no.3
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    • pp.187-207
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    • 2014
  • The purpose of this paper is to examine the business performance difference based on the ownership structure type in the aspect of profitability and stability. In order to conduct this analysis in two aspects, the ship financial institutions have been classified into two groups: state-owned banks and private-owned banks. First of all, the difference of ROE and ROA between private and public ship financial institutions is statistically significant, but no difference has been shown in terms of stability measured through BIS capital adequacy ratio. Second, to test the business performance difference according to the ownership structure types before and after the global financial crisis, we examined the outcome difference in the ship financial institutions in terms of profitability and stability. However, in the event that the analysis was conducted with public and private financial institutions, the business outcome difference before and after the global financial crisis has been shown in the sector of private financial institutions, but has not been shown in the sector of public financial institutions. It is meaningful that this study is the first work which examined the difference of the operating performance by the ownership structure types of ship financial institutions. However, it is noted that small sample for this empirical study is a limitation of this thesis.

A Study on the Comparison Among Korea, China and Japan Food Cultures (II) - From 14C to 19C, on the Daily foods - (한(韓).중(中).일(日)의 식생활문화(食生活文化) 비교연구(比較硏究) (II) - $14{\sim}19$세기, 일상식품(日常食品)을 중심(中心)으로-)

  • Ahn, Myung-Soo
    • Journal of the Korean Society of Food Culture
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    • v.12 no.3
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    • pp.353-364
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    • 1997
  • A study was carried out to compare the daily foods which were eaten during $14{\sim}19$ century among Korea (Chosun dynasty), China (Ming, thing dynasty), and Japan (Muromachi, Edo era). Specially, in Ming, Ching dynasty, Noodles and dumpling were cooked very often and in Muromachi, Edo era, many kinds of beans were used so much, and there were many kinds of steamed rice to compare with Korea and China. Also, in Japan at these era Woodong, Morisoba, and Somyen were used as favorite foods harbitually. 1. The crops were used as staple foods in three countries such as steamed rice, gruel, noodle, dumpling, rice cake etc. commonly. 2. In Chosun, a roe deer, deer, antelope, and wild boar were more favoite dishes than cow, chicken, and dog, generally people enjoyed to eat pork and chicken. In Ming Ching, pork, chicken, goose, dove, lamb, ass, and duck were used as food materials, also wild animals such as deer, rabbit, and monkey etc. were used. In Muromach era, wild animal as racoon dog, otter, deer, antelope, bear, were used as food materials, in early Edo era (Yayoi and Momoyama), beef and pork were used as daily foods but they were eaten decreasingly in Edo era. So in Japan at those era, the dishes prepared of fishes were more than those of meats. For example, Sushi was made from that time, people all over the world are enjoying to have Sushi at present time. 3. Also in these era, many kinds of vegetables and fruits were used in three countries, and new kinds of vegetables and fruits were introduced from foreign countries, for example, red pepper, pumpkin, sweet potato, potato in Korea, corn, sweet potato, red pepper in China, and water melon, pumpkin, corn, red pepper, marmellow, sweet potato, sugar beet in Japan.

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CFD Analysis on Base Region of Small Scaled 4 Nozzle Clustered Engine Configuration (CFD를 이용한 축소형 공기 클러스터드 노즐의 저부 유동 분석)

  • Kim, Seong-Lyong;Kim, In-Sun
    • Aerospace Engineering and Technology
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    • v.11 no.1
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    • pp.68-77
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    • 2012
  • Flow characteristics of base region of small scaled 4 nozzle clustered engine has been analyzed with CFD approach along with the tests of numerical methods. The numerical test shows that Spalart-Allmaras turbulence model is appropriate for the present research. Plumes expanded from nozzles exits collide with each other and make high pressure stagnation region. Some of collided plumes expand again reversely into the base region with supersonic speeds. The reversed plume in the base region goes out to the outer region through the minimum vent area formed by the nearest nozzle exterior surfaces. But different from the empirical theory, the minimum vent area does not play a role of throat. Additionally the temperature of the nozzle inner surface strongly affects the temperature of the reversed plumes.

PREDICTION OF SEPARATION TRAJECTORY FOR TSTO LAUNCH VEHICLE USING DATABASE BASED ON STEADY STATE ANALYSIS (정상 해석 기반의 데이터베이스를 이용한 TST 비행체의 분리 궤도 예측)

  • Jo, J.H.;Ahn, S.J.;Kwon, O.J.
    • Journal of computational fluids engineering
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    • v.19 no.2
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    • pp.86-92
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    • 2014
  • In this paper, prediction of separation trajectory for Two-stage-To-Orbit space launch vehicle has been numerically simulated by using an aerodynamic database based on steady state analysis. Aerodynamic database were obtained for matrix of longitudinal and vertical positions. The steady flow simulations around the launch vehicle have been made by using a 3-D RANS flow solver based on unstructured meshes. For this purpose, a vertex-centered finite-volume method was adopted to discretize inviscid and viscous fluxes. Roe's finite difference splitting was utilized to discretize the inviscid fluxes, and the viscous fluxes were computed based on central differencing. To validate this flow solver, calculations were made for the wind-tunnel experiment model of the LGBB TSTO vehicle configuration on steady state conditions. Aerodynamic database was constructed by using flow simulations based on test matrix from the wind-tunnel experiment. ANN(Artificial Neural Network) was applied to construct interpolation function among aerodynamic variables. Separation trajectory for TSTO launch vehicle was predicted from 6-DOF equation of motion based on the interpolated function. The result of present separation trajectory calculation was compared with the trajectory using experimental database. The predicted results for the separation trajectory shows fair agreement with reference[4] solution.

The Impact of Foreign Ownership and Management on Firm Performance in Vietnam

  • NGUYEN, Thi Xuan Hong;PHAM, Thu Huyen;DAO, Thi Nhung;NGUYEN, Thi Nga;TRAN, Thi Kim Ngoc
    • The Journal of Asian Finance, Economics and Business
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    • v.7 no.9
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    • pp.409-418
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    • 2020
  • The human and capital resources from foreign investors are important sources of finance for developing countries. Foreign ownership can help the firm to raise funds for operations and the foreign management can help the firm expand the market and improve management. However, does this really happen to Vietnamese firm? To find the answer to that question, this paper examines the impact of foreign ownership and management on the financial performance of listed firms on Vietnam's stock market. The data collected include 427 listed firms in all fields over five years, from 2014 to 2018. The financial performance is measured by Tobin's Q, ROA and ROE. The study carried out testing of each model by the least squares method of Pool OLS, assessing random effects (REM) and evaluating fixed effects (FEM). The most effective model is the FEM model. The results show that the foreign ownership ratio and the size of the firm have a positive impact on the financial performance. The foreign management, the age of the firms, the liquidity and financial leverage have a negative impact on the financial performance. Based on the research results, the study proposes some recommendations to improve the financial performance of listed firms in Vietnam.

Quality Evaluation of Low-Salt Fermented Seafoods (저염젓갈류의 품질평가 방법에 관한 연구)

  • KIM Young-Man;KANG Min-Cheol;HONG Jeong-Hwa
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.28 no.3
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    • pp.301-308
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    • 1995
  • To establish the quality criteria of low-salt fermented seafoods in terms of consumer acceptability, sensory assessment and physicochemical analysis were undertaken using commercial products. In case of low-salt fermented Alaska pollack (Theragra chalcogramma) roe, Brix over $47.6\%$ for unseasoned products and $41.2\%$ for seasoned ones were considered as acceptable products. In spite of some variations between manufacturers, increase in whiteness was observed as consumer acceptability was decreased. In contrast, whiteness was not suitable criteria for low-salt fermented squid (Sepiella maindroni). Brix can be used as good criteria as long as its relationship was established to acceptability of different products; pH also showed the same tendency as Brix. In case of low-salt fermented Alaska pollack tripe, Brix was likely to be the best criteria; whiteness, in addition, could be used as quality criteria.

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