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See Seong Chang,Qian Jun Tong,Zhi Yuen Beh,Kelvin Howyow Quek,Bun Hui Ang 대한마취통증의학회 2018 Korean Journal of Anesthesiology Vol.71 No.4
Background: The ideal emergency cricothyroidotomy technique remains a topic of ongoing debate. This study aimed to compare the cannula-to-Melker technique with the scalpel-bougie technique and determine whether yearly training in cricothyroidotomy techniques is sufficient for skill retention. Methods: We conducted an observational crossover bench study to compare the cannula-to-Melker with the scalpel- bougie technique in a porcine tracheal model. Twenty-eight anesthetists participated. The primary outcome was time taken for device insertion. Secondary outcomes were first-pass success rate, incidence of tracheal trauma, and technique preference. We also compared the data on outcome measures with the data obtained in a similar workshop a year ago. Results: The scalpel-bougie technique was significantly faster than the cannula-to-Melker technique for cricothyroidotomy (median time of 45.2 s vs. 101.3 s; P = 0.001). Both techniques had 100% success rate within two attempts; there were no significant differences in the first-pass success rates and incidence of tracheal wall trauma (P > 0.999 and P = 0.727, respectively) between them. The relative risks of inflicting tracheal wall trauma after a failed cricothyroidotomy attempt were 6.9 (95% CI 1.5–31.1), 2.3 (95% CI 0.3–20.7) and 3.0 (95% CI 0.3–25.9) for the scalpel-bougie, cannula-cricothyroidotomy, and Melker-Seldinger airway, respectively. The insertion time and incidence of tracheal wall trauma were lower when the present data were compared with data from a similar workshop conducted the previous year. Conclusions: This study supports the use of a scalpel-bougie technique for cricothyroidotomy by anesthetists and advocates a yearly training program for skill retention.
Useful Lifetime Prediction of Rubber Components Using Accelerated Testing
Chang Su Woo,Sung Seen Choi,Seong Beom Lee,Hyun Sub Kim IEEE 2010 IEEE transactions on reliability Vol.59 No.1
<P>Rubber material properties, and useful lifetime prediction and evaluation are very important in the design procedure to assure the safety and reliability of rubber components. We have been interested for many years in predicting the lifetimes of rubber materials in oxygen-containing environments using a combination of accelerated aging tests and extrapolation models. In this paper, we investigate the heat aging effects on the material properties, and useful lifetime prediction of ethylene-propylene diene M-class rubber (EPDM), and acrylonitrile-butadiene rubber (NBR) for refrigerator components. The experimental results sssay that the crosslink density changes are varied with compositions of rubber vulcanization, and characteristics of heat aging behaviors of rubber vulcanizates are described well using the activation energy change with aging time. The stress and strain curves were obtained from the results of the simple tension test for specimens. To predict the useful lifetime of EPDM, and NBR, the mechanical property changes were determined under accelerated aging conditions. Rubber was aged at temperatures ranging from 50°C to 100°C for times ranging from 1 to 180 days. We present a general approach for more confidently correlating accelerated aging results with aging under service conditions using the Arrhenius methodology. By using the compression set test, several useful lifetime prediction equations for rubber material are proposed.</P>
박시형,이신원,정귀화,최창훈,이순희,한정훈,김정국,하승우,김보완 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.4
Autoimmune insulin syndrome is characterized by insulin autoantibody, hyperinsulinemia, and fasting hypoglycemia without previous insulin immunization. This syndrome shows discordant levels between immunoreactive insulin and C-peptide. Negative results of an anatomic study of the pancreas and an inability to reproduce hypoglycemia during a prolonged fast may be helpful in excluding insulinoma. Symptomatic hypoglycemia usually develops during an oral glucose tolerance test. This syndrome is a self-limited disorder. Recently, we experienced one case that developed symptomatic hypoglycemia during both the fasting & oral glucose tolerance test, and another that developed symptomatic hypoglycemia during the oral glucose tolerance test but not the fasting test. Hereby, we present these cases with a review of the literature
Manufacturing and Evaluating for the Two Layer/Explosive Materials and their Numerical Simulations
Kim, See Jo,Mun, Sang Ho,Lee, Kee Ahn,Lee, Chang Hee,Lee, Seong Trans Tech Publications, Ltd. 2014 Materials science forum Vol.767 No.-
<P>Combination of different materials used in the liner of the shaped charge is of great importance in designing for maximization of energy transfer. In general, a Cu liner is widely used for the special purpose in military as well as in industry. The reactive Cu liners require excellent mechanical properties and reactivity of the energetic materials. Pure Al powders are widely known as energetic materials. In this regard, the integrated work was done based on the three procedures. First, the kinetic-sprayed Al coating was fabricated on Cu substrate to generate a reactive Cu liner. And the reactivity, bonding and mechanical properties of kinetic-sprayed Al coatings were investigated. Second, the experimental evaluation of kinetic-sprayed Al coatings in terms of the strain rate. Finally numerical modeling and simulation were carried outand discussed for visibility validation.</P>
좌측 주기관지 근위부에서 발생한 무기폐를 동반한 횡문근 육종의 수술 치료 -1례 보고-
김연수,장우익,허진원,박시영,장선희,박경택,김창영,류지윤,조성준,Kim, Yeon-Soo,Chang, Woo-Ik,Huh, Jin-Won,Park, See-Young,Chang, Sun-Hee,Park, Kyung-Taek,Kim, Chang-Young,Ryoo, Ji-Yoon,Cho, Seong-Joon 대한기관식도과학회 2007 大韓氣管食道科學會誌 Vol.13 No.2
Treatment choice for primary pulmonary sarcoma is complete surgical resection. A 69 year old man developed dyspnea due to left lung atelectasis. There was endobronchial tumor completely obstructing the left main bronchus. The tumor was resected completely by main bronchial resection via a left thoracotomy incision, and diagnosed as leiomyosarcoma. Bronchoscopy and computed tomography in 6 months after operation, there was no evidence of recurrence.
이중층 라이너에서 폭발 재료 분포에 따른 변형 특성 수치해석
문상호,김시조,이창희,이성,Mun, Sang Ho,Kim, See Jo,Lee, Chang Hee,Lee, Seong 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.5
The development of new concepts of liners is required in order to effectively neutralize the enemy's attack power concealed in the armored vehicles. A multiple-layer liner is one of possibilities and has a mechanism for explosion after penetrating the target which is known as "Behind Armor Effect." The multiple-layer explosive liner should have sufficient kinetic energy to penetrate the protective structure and explosive material react after target penetration. With this in mind, double-layer liner materials were obtained by cold spray coating methods and these material properties were experimentally characterized and used in this simulation for double-layer liners. In this study, numerical simulations in the three different layer types, i.e., single, A/B, A/B/A in terms of the layer location were verified in terms of finite element mesh sizes and numerical results for the jet tip velocity, kinetic energy, and the corresponding jet deformation characteristics were analysed in detail depending on the structure of layer types.
Yean Chin Lim,Zhao Kun Koo,Vivian. W. Ho,See Seong Chang,Shivani Manohara,Qian Jun Tong 대한마취통증의학회 2020 Korean Journal of Anesthesiology Vol.73 No.5
Background: Interscalene brachial plexus block (ISB) provides excellent analgesia for arthroscopic shoulder surgeries but is associated with adverse effects including hemidiaphragmatic paresis. We aimed to compare the respiratory effects, forced vital capacity (FVC), and forced expiratory volume in 1 second (FEV1) between suprascapular nerve block (SSB) and ISB. Methods: Sixty patients were recruited and randomized into ISB, anterior SSB, and posterior SSB groups. FVC, FEV1, and diaphragmatic excursion were evaluated at baseline and 30 minutes after intervention. Blocks were performed under ultrasound guidance with 15 ml of 0.5% ropivacaine. Pain scores were assessed at 1, 6, 12, and 24 hours postoperatively. Results: The ISB group showed a reduced FVC of 31.2% ± 17.5% (mean ± SD), while the anterior and posterior SSB groups had less reduction of 3.6% ± 18.6% and 6.8% ± 6.5%, respectively (P < 0.001). The ISB group showed more reduction in diaphragmatic excursion than the anterior and posterior SSB groups (median [IQR]): −85.7% (−95.3% to −63.3%) vs. −1.8% (−13.1% to 2.3%) and −1.2% (−8.8% to 16.8%), respectively (P < 0.001). The median pain scores (IQR) in the ISB and anterior SSB groups were lower than those in the posterior SSB group at 6 hours on movement: 0 (0–2), 1.8 (0–4.5) vs. 5 (2.5–8), respectively (P = 0.002). There was no significant difference in oxycodone consumption postoperatively. Conclusions: Anterior SSB preserves lung function and has a comparable analgesic effect as ISB. Thus, it is recommended for arthroscopic shoulder surgeries, especially in patients who have reduced lung function.
문상호,김시조,이창희,이성,Mun, Sang Ho,Kim, See Jo,Lee, Chang Hee,Lee, Seong 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
The development of new concepts of liner is of great importance to effectively neutralize the enemy's attack power concealed in the protective structure or armored vehicles. A double layer liner has a combination of two different materials, one for penetration of target and the other for explosion after penetration. Therefore, it is of great importance to understand the temperature distribution before impact which should be lower than the explosive temperature of pure explosive material of the liner used. In this study, two different liner materials were obtained using cold spray coating and these material properties were characterized by DSC experiments. Numerical computations were done and the effect of temperature distribution and changes over time at each point of the explosive material depending on the layer types of the liner were discussed and analysed in the jet state.