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남주하,이기백 서강대학교 경제학연구원 2002 시장경제연구 Vol.31 No.1
Since previous researches of bankruptcy prediction model focused on financial information to analyze bankruptcy prediction model this paper empirically studies whether non-financial information can improve the accuracy of bankruptcy prediction. When non-financial ratios are included the accuracy is sharply increased, e.g., at least 8%p more. We also find that the model of artificial neural network maybe more accurate than the multivariate discriminant analysis or logit analysis, however, the difference is not too big.
Anion Extraction-Induced Polymorph Control of Transition Metal Dichalcogenides
Nam, Dae-Hyun,Kim, Ji-Yong,Kang, Sungwoo,Joo, Wonhyo,Lee, Seung-Yong,Seo, Hongmin,Kim, Hyoung Gyun,Ahn, In-Kyoung,Lee, Gi-Baek,Choi, Minjeong,Cho, Eunsoo,Kim, Miyoung,Nam, Ki Tae,Han, Seungwu,Joo, You American Chemical Society 2019 NANO LETTERS Vol.19 No.12
<P>Controlled phase conversion in polymorphic transition metal dichalcogenides (TMDs) provides a new synthetic route for realizing tunable nanomaterials. Most conversion methods from the stable 2H to metastable 1T phase are limited to kinetically slow cation insertion into atomically thin layered TMDs for charge transfer from intercalated ions. Here, we report that anion extraction by the selective reaction between carbon monoxide (CO) and chalcogen atoms enables predictive and scalable TMD polymorph control. Sulfur vacancy, induced by anion extraction, is a key factor in molybdenum disulfide (MoS<SUB>2</SUB>) polymorph conversion without cation insertion. Thermodynamic MoS<SUB>2</SUB>-CO-CO<SUB>2</SUB> ternary phase diagram offers a processing window for efficient sulfur vacancy formation with precisely controlled MoS<SUB>2</SUB> structures from single layer to multilayer. To utilize our efficient phase conversion, we synthesize vertically stacked 1T-MoS<SUB>2</SUB> layers in carbon nanofibers, which exhibit highly efficient hydrogen evolution reaction catalytic activity. Anion extraction induces the polymorph conversion of tungsten disulfide (WS<SUB>2</SUB>) from 2H to 1T. This reveals that our method can be utilized as a general polymorph control platform. The versatility of the gas-solid reaction-based polymorphic control will enable the engineering of metastable phases in 2D TMDs for further applications.</P> [FIG OMISSION]</BR>
누두흉환자에서 Nuss 방법에 의한 수술 중 환기방법에 따른 호기 일회호흡량, 흡기 최대압력 및 활력징후의 변화
조수현,이선학,안기량,박욱,박형주,곽수달,백남순,김천숙 대한마취과학회 2001 Korean Journal of Anesthesiology Vol.41 No.2
Changes of Vital Signs, Expired Volume and Maximal Pressure by Mode of Ventilation during a Nuss Operation in Patients with Pectus Excavatum Soo Dal Kwak, M.D., Nam Soon Baek, M.D., Su Hyun Cho, M.D. Ki Ryang Ahn, M.D., Sun Hak Lee, M.D., Chun Suk Kim, M.D. Wook Park, M.D., and Hyung Joo Park, M.D. Departments of Anesthesiology, ??Chest Surgery, College of Medicine, Soonchunhyang University, Cheonan, Korea Background: This study was undertaken in order to investigate any cardiopulmonary changes caused by the surgical procedure during a Nuss operation in patients with pectus excavatum. Methods: Thirty patients undergoing the Nuss operation were divided into two groups. The patients were randomly assigned to either Group-V (n = 15) which volume controlled ventilation was applied, or to Group-p (n = 15) where pressure controlled ventilation was applied. Mechanical ventilation provided a tidal volume to be set at approximately 10 ml/kg and a frequency set to keep ETCO_2 in range, between 32 mmHg and 38 mmHg. During the surgical procedure, we recorded expired volume (V_E) and inspired maximal pressure (Pmax) changes according to the ventilator mode, and then also recorded changes in vital signs. Results: Heart rate and blood pressure had no significant changes in either groups. In Group-V, during rotation of the metal bar, there was a significant decrease in expired volume (P < 0.001), changes of inspired maximal pressure gradually increased with the operation (P < 0.001). In Group-P, rotation of the metal bar caused a significant decrease in expired volume (P < 0.001). Conclusions: During the Nuss operation, there should be careful observation of changes in the vital signs, expired volume and maximal pressure during insertion and rotation of the metal bar. (Korean J Anesthesiol 2001; 41: 178~183)
Development of the Simultaneous Analysis method for Antidiabetic Compounds by LC-MS/MS
Nam-Sook Kim,Geum Joo Yoo,Kyu Yeon Kim,Ji Hyun Lee,Hyoung-Joon Park,Taeik Hwang,Seok Heo,Jeong-Hwa Cho,Jun-hyoung Kim,Dong Woo Shin,Chang-Yong Yoon,Sung-Kwan Park,Sun Young Baek 한국식품영양과학회 2016 한국식품영양과학회 학술대회발표집 Vol.2016 No.10
Optimization of extraction conditions for the UPLC Analysis of Anti-diabetic Compounds
Nam-Sook Kim,Kyu Yeon Kim,Geum Joo Yoo,Ji Hyun Lee,Hyoung-Joon Park,Taeik Hwang,Seok Heo,Jeong-Hwa Cho,Jun-hyoung Kim,Dong Woo Shin,Chang-Yong Yoon,Sung-Kwan Park,Sun Young Baek 한국식품영양과학회 2016 한국식품영양과학회 학술대회발표집 Vol.2016 No.10
Baek, Seung Woo,Ryu, Jae Sung,Jung, Cheol Hee,Lee, Joo Han,Kwon, Won Kyoung,Woo, Nam Sik,Kim, Hae Kyoung,Kim, Jae Hun The Korean Pain Society 2013 The Korean Journal of Pain Vol.26 No.2
Background: C-arm fluoroscope has been widely used to promote more effective pain management; however, unwanted radiation exposure for operators is inevitable. We prospectively investigated the differences in radiation exposure related to collimation in Medial Branch Block (MBB). Methods: This study was a randomized controlled trial of 62 MBBs at L3, 4 and 5. After the patient was laid in the prone position on the operating table, MBB was conducted and only AP projections of the fluoroscope were used. Based on a concealed random number table, MBB was performed with (collimation group) and without (control group) collimation. The data on the patient's age, height, gender, laterality (right/left), radiation absorbed dose (RAD), exposure time, distance from the center of the field to the operator, and effective dose (ED) at the side of the table and at the operator's chest were collected. The brightness of the fluoroscopic image was evaluated with histogram in Photoshop. Results: There were no significant differences in age, height, weight, male to female ratio, laterality, time, distance and brightness of fluoroscopic image. The area of the fluoroscopic image with collimation was 67% of the conventional image. The RAD ($29.9{\pm}13.0$, P = 0.001) and the ED at the left chest of the operators ($0.53{\pm}0.71$, P = 0.042) and beside the table ($5.69{\pm}4.6$, P = 0.025) in collimation group were lower than that of the control group ($44.6{\pm}19.0$, $0.97{\pm}0.92$, and $9.53{\pm}8.16$), resepectively. Conclusions: Collimation reduced radiation exposure and maintained the image quality. Therefore, the proper use of collimation will be beneficial to both patients and operators.
Thermal Process for Enhancing Mechanical Strength of PLGA Nanoparticle Layers on Coronary Stents
Joo, Jae-Ryang,Nam, Hye-Yeong,Nam, So-Hee,Baek, In-Su,Park, Jong-Sang Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.9
Poly (lactic-co-glycolic acid) (PLGA) nanoparticles loading paclitaxel have been deposited on coronary stents by self-assembling properties of colloidal particles. The layers of the nanoparticles were enhanced to a sufficient mechanical strength by a thermal process under the proper temperature and humidity conditions. In vitro release studies proved the controlled paclitaxel release of the nanoparticle layers. This technique gives rise to a new range of applications for nanoparticles and drug-eluting stents.