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A Study on How to Improve Magnesium Anodizing Process with High Biocompatibility
Sang-jun Kwon,Jin-young Hur,Chang-Myeon Lee,Kwan-seop Jang,Sung-mo Moon,Hong-kee Lee 한국표면공학회 2015 한국표면공학회지 Vol.48 No.5
Anodization of die-casted AZ91D magnesium alloy was carried out using silicate based electrolyte solution instead of fluoride based solution to improve biocompatibility of oxidized layers. The anodic layer obtained from silicate based solution has smaller size of pore and smoother surface, resulting in lower corrosion rate in simulate body solution (SBF). Effect of enhanced structural and chemical properties in oxidized layer on biocompatibility was carefully considered.
Predicting the Firmness of Apples using a Non-contact Ultrasonic Technique
( Sang Dae Lee ),( Jeong Gil Park ),( Hyun Mo Jeong ),( Ki Bok Kim ),( Byoung Kwan Cho ) 한국농업기계학회 2013 바이오시스템공학 Vol.38 No.3
Purpose: Methods for non-destructive estimation of product quality have been reported in various industrial fields, but the application of ultrasonic techniques for the agricultural products of potatoes, pears, apples, watermelons, kiwis and tomatoes etc. have been rarely reported since the application of a contact-type ultrasonic transducer in agricultural products is very difficult. Therefore, this study sought to determine the firmness of apples using non-contact ultrasonic techniques. Methods: For this experiment, an ultrasonic experimental tester using a non-contact ultrasonic transducer was created, and a signal processing program was used to analyze the acquired ultrasonic reflected signal. Also, a universal testing machine was used to measure firmness parameters of the apples such as bioyield strength, a firmness factor, after the ultrasonic tests had been performed. Results: Six distance correction factors were calculated to obtain consistent values of ultrasonic properties regardless of the distance between the transducer and the surface of the subject. We developed prediction models of the bioyield strength using the distance correction factors. Conclusions: The optimum prediction model of the bioyield strength of apples using a non-contact ultrasonic technique was a multiple regression model (R2=O.9402).
Angle-resolved photoemission spectroscopy for the study of two-dimensional materials
Mo Sung-Kwan 나노기술연구협의회 2017 Nano Convergence Vol.4 No.6
Quantum systems in confined geometries allow novel physical properties that cannot easily be attained in their bulk form. These properties are governed by the changes in the band structure and the lattice symmetry, and most pronounced in their single layer limit. Angle-resolved photoemission spectroscopy (ARPES) is a direct tool to investigate the underlying changes of band structure to provide essential information for understanding and controlling such properties. In this review, recent progresses in ARPES as a tool to study two-dimensional atomic crystals have been presented. ARPES results from few-layer and bulk crystals of material class often referred as “beyond graphene” are discussed along with the relevant developments in the instrumentation.
Mo, Changyeun,Lim, Jongguk,Kwon, Sung Won,Lim, Dong Kyu,Kim, Moon S.,Kim, Giyoung,Kang, Jungsook,Kwon, Kyung-Do,Cho, Byoung-Kwan Korean Society for Agricultural Machinery 2017 바이오시스템공학 Vol.42 No.4
Purpose: This study aims to propose a method for fast geographical origin discrimination between domestic and imported rice using a visible/near-infrared (VNIR) hyperspectral imaging technique. Methods: Hyperspectral reflectance images of South Korean and Chinese rice samples were obtained in the range of 400 nm to 1000 nm. Partial least square discriminant analysis (PLS-DA) models were developed and applied to the acquired images to determine the geographical origin of the rice samples. Results: The optimal pixel dimensions and spectral pretreatment conditions for the hyperspectral images were identified to improve the discrimination accuracy. The results revealed that the highest accuracy was achieved when the hyperspectral image's pixel dimension was $3.0mm{\times}3.0mm$. Furthermore, the geographical origin discrimination models achieved a discrimination accuracy of over 99.99% upon application of a first-order derivative, second-order derivative, maximum normalization, or baseline pretreatment. Conclusions: The results demonstrated that the VNIR hyperspectral imaging technique can be used to discriminate geographical origins of rice.
Perioperative Antibiotic Prophylaxis May Not Be Required Routinely in Thyroid Surgery
Kwan Bum Lee,Soo Young Kim,Seok Mo Kim,Ho Jin Chang,Bup Woo Kim,Yong Sang Lee,Hang Seok Chang,Cheong Soo Park,Chi Young Lim 대한갑상선-내분비외과학회 2017 The Koreran journal of Endocrine Surgery Vol.17 No.4
Purpose: Although perioperative antibiotic prophylaxis is used to prevent surgical site infection (SSI), thyroid surgery is classified as a clean surgical procedure and routine use of perioperative antibiotic prophylaxis is not recommend. The purpose of this study is to evaluate the therapeutic benefits of using perioperative antibiotic prophylaxis in thyroid surgery. Methods: We evaluated medical records of 1,895 patients who underwent thyroid surgery between January 2013 and December 2013. We divided 2 groups with or without perioperative antibiotic prophylaxis. Clinical factors including sex, age, body mass index (BMI), and comorbidity and surgical factors for SSI were analyzed. Results: The male to female ratio was 1:3.3, the average age was 43 (14-82) years old. The numbers of groups without and with antibiotic prophylaxis were 593 and 1,303. Thirty-seven cases (2.0%) of postoperative complications were observed including chyle leakage, SSI, and nerve injury. The SSI was occurred in 10 patients (0.5%). Clinical factors with SSI were analyzed and there was no statistical significance between 2 groups. Conclusion: In thyroid surgery, perioperative antibiotic prophylaxis may not be required routinely once the surgical procedure underwent with aseptic condition and the patients care was performed appropriately.
Mo, Sung-Kwan,Hwang, Choongyu,Zhang, Yi,Fanciulli, Mauro,Muff, Stefan,Hugo Dil, J,Shen, Zhi-Xun,Hussain, Zahid IOP 2016 Journal of Physics, Condensed Matter Vol.28 No.45
<P>Few-layer thick MoSe<SUB>2</SUB> and WSe<SUB>2</SUB> possess non-trivial spin textures with sizable spin splitting due to the inversion symmetry breaking embedded in the crystal structure and strong spin–orbit coupling. We report a spin-resolved photoemission study of MoSe<SUB>2</SUB> and WSe<SUB>2</SUB> thin film samples epitaxially grown on a bilayer graphene substrate. We only found spin polarization in the single- and trilayer samples—not in the bilayer sample—mostly along the out-of-plane direction of the sample surface. The measured spin polarization is found to be strongly dependent on the light polarization as well as the measurement geometry, which reveals intricate coupling between the spin and orbital degrees of freedom in this class of material.</P>
( Changyeun Mo ),( Jongguk Lim ),( Sung Won Kwon ),( Dong Kyu Lim ),( Moon S. Kim ),( Giyoung Kim ),( Jungsook Kang ),( Kyung-do Kwon ),( Byoung-kwan Cho ) 한국농업기계학회 2017 바이오시스템공학 Vol.42 No.4
Purpose: This study aims to propose a method for fast geographical origin discrimination between domestic and imported rice using a visible/near-infrared (VNIR) hyperspectral imaging technique. Methods: Hyperspectral reflectance images of South Korean and Chinese rice samples were obtained in the range of 400 nm to 1000 nm. Partial least square discriminant analysis (PLS-DA) models were developed and applied to the acquired images to determine the geographical origin of the rice samples. Results: The optimal pixel dimensions and spectral pretreatment conditions for the hyperspectral images were identified to improve the discrimination accuracy. The results revealed that the highest accuracy was achieved when the hyperspectral image’s pixel dimension was 3.0 mm × 3.0 mm. Furthermore, the geographical origin discrimination models achieved a discrimination accuracy of over 99.99% upon application of a first-order derivative, second-order derivative, maximum normalization, or baseline pretreatment. Conclusions: The results demonstrated that the VNIR hyperspectral imaging technique can be used to discriminate geographical origins of rice.
Enteral Patch Repair of the Vena Caval Defect : 실험적 연구 An Experimental Study
Park, Sang Kyun,Sohn, Soo Sang,Kim, In Ho,Kang, Joong Shin,Park, Kwan Kyu,Kim, Jin Mo 啓明大學校 醫科大學 1995 계명의대학술지 Vol.14 No.2
세 마리의 한국산 잡종견을 전신마취하에 무균적 처치를 시행한 후 개복하였다. 신정맥 하방부위의 하공정맥을 5.0 ㎝ 가량 박리 노출하여 Satinsky 혈관 감자로서 잡은 후 하공정맥의 전방벽을 7.0 x 14.0 mm 크기로 절제하였다. 이 정맥의 결손 부위를 인접해 있는 소장의 장막에 3 - 0 내지 4 - 0 Dexon 봉합사를 이용해서 봉합하였다. 실험동물들은 수술후 4내지 6주간 생존시킨 후 재개복하여 총장골정맥을 통하여 60% Urograffin을 주입하여 하공정맥조영술을 시행하였다. 세 마리의 개 모두에 있어서 하공정맥이 잘 개통되어 있음이 확인되었으며 봉합부의의 정맥과 소장벽은 병리검사를 위해서 절제하였다. 조직학적 검사에서 정맥결손 부위에 봉합한 소장의 장막 부위에 새로운 내막층이 형성된 것이 확인되었으며, 이 내막층은 단층의 내피세포로서 피복되어 있었다. 이 실험의 결과 대정맥벽결손 부위를 소장벽을 이용 복원하므로서 대정맥 기능을 회복시킬 수 있는 가능성이 있는 것이 확인되었다. 아직 임상치험례는 없지만 이 방법이 대정맥 결손을 복원하는 방법중에 유용한 한 가지가 되리라 믿는다. Injuries to the inferior vena cava and their management are being reported with increasing frequency in the civilian population nowadays. Repairs of the vena caval injury with suture, replacement of the segment of the vein with autogenous or prosthetic grafts, patch fraft or ligation have been reported withe success in the literatures. A small size defect can be repaired with either vein patch graft or prosthetic fraft, but the small bowel wall can also be used to patch repair the defect of the vena cava. The experimental study in animal models revealed satisfactory results with no post-repair thrombosis or narrowing of the lumen. This experimental attempt may well be tried in the clinical cases with satisfactory results. Key Words: Enteral patch, Vena caval defect, En-dothelial cell