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요오드화 조영제 과민반응 예측을 위한 사전 피부 시험의 유효성
김태범 대한의사협회 2020 대한의사협회지 Vol.63 No.3
Hypersensitivity reaction to iodinated contrast media (ICM) is a persistent clinical issue owing to widespread use of computed tomography (CT) examinations. The question of whether routine performance of skin tests can predict hypersensitivity reactions to contrast media remains unresolved. Recently, a prospective study was performed to evaluate the role of an intradermal skin test as a prescreening test for hypersensitivity reactions to ICM. Fifteen (0.5%) of the 2,843 patients had positive skin test results prior to scheduled CT scans. However, none of the patients experienced a hypersensitivity reaction after administration of full-dose ICM. Meanwhile, 19 patients who experienced hypersensitivity reactions to an ICM challenge showed negative skin test results. The sensitivity and positive predictive value of skin tests for hypersensitivity reaction to ICM were both 0%. More studies should be conducted to confirm the uselessness of prescreening skin tests. In conclusion, a prescreening intradermal skin test prior to a CT scan has no significant clinical value as a tool for predicting hypersensitivity reactions to ICM. Therefore, prescreening skin tests should not be routinely performed.
Larger Testicular Volume Is Independently Associated with Favorable Indices of Lung Function
김태범,박이내 대한결핵및호흡기학회 2017 Tuberculosis and Respiratory Diseases Vol.80 No.4
Background: Men with chronic obstructive pulmonary disease, have reduced endogenous testosterone levels, but the relationship between pulmonary function and endogenous testosterone levels, is inconsistent. Testicular volume is a known indicator of endogenous testosterone levels, male fertility, and male potency. In the present study, the authors investigated the relationship, between testicular volume and lung function. Methods: One hundred and eighty-one South Korean men age 40–70, hospitalized for urological surgery, were retrospectively enrolled, irrespective of the presence of respiratory disease. Study subjects underwent pulmonary function testing, prior to procedures, and testicular volumes were measured by orchidometry. Testosterone levels of patients in blood samples collected between 7 AM and 11 AM, were measured by a direct chemiluminescent immunoassay. Results: The 181 study subjects were divided into two groups, by testicular volume (≥35 mL vs. <35 mL), the larger testes group, had better lung functions (forced vital capacity [FVC]: 3.87±0.65 L vs. 3.66±0.65 L, p=0.037; forced expiratory volume in 1 second [FEV1]: 2.92±0.57 L vs. 2.65±0.61 L, p=0.002; FVC % predicted: 98.2±15.2% vs. 93.8±13.1%, p=0.040; FEV1 % predicted: 105.4±19.5% vs. 95.9±21.2%, p=0.002). In addition, the proportion of patients with a FEV1/FVC of <70%, was lower in the larger testes group. Univariate analysis conducted using linear regression models, revealed that testicular volume was correlated with FVC (r=0.162, p=0.029), FEV1 (r=0.218, p=0.003), FEV1/FVC (r=0.149, p=0.046), and FEV1 % predicted (r=0.178, p=0.017), and multivariate analysis using linear regression models, revealed that testicular volume was a significant predictive factor for FEV1 % predicted (β =0.159, p=0.041). Conclusion: Larger testicular volume was independently associated, with favorable indices of lung function. These results suggest that androgens, may contribute to better lung function.
김태범,김정식,정현철,이희조 에스케이텔레콤 (주) 2012 Telecommunications Review Vol.22 No.6
무선 통신을 기반으로 하는 스마트기기의 증가는근거리 무선 네트워크 사용에 영향을 미치고 있다.스마트 기기들은 공공장소에서 인터넷 뱅킹, 이메일, 소셜 네트워크 서비스등과 같은 다양한 서비스들을 제공받을 수 있다. 하지만, 무선 기술의 발전에도 무선의 근본적인 기술을 위협하는 중요한 문제들이 점점 증가하고 있다. 무선 보안 중 가장 위험한 행위로는 스푸핑된 무선 장비로써, 악성 장비가 주변의 정상 장비처럼 행동을 하여 정상 사용자들을 속이고 악성 행위를 숨기는 것을 의미한다. 이를 통해, 공격자는 정상 사용자의 민감한 정보를 가로채거나 변조할 수 있다. 본 논문에서는 무선 공격과 시나리오를 통해 무선 보안의 위험성을 보이고 악의적인 무선 장비 탐지의 필요성을 보인다.제안하는 탐지 방법은 비콘프레임 주기를 이용하여 스푸핑된 무선 장비와정상 장비를 구분하는 방법이다. 실험 결과를 통해 제안하는 탐지 방법은 스푸핑된 무선 장비에 대해 90% 이상의 탐지율을 보임을 알 수 있었다.
김태범,안효준,허보영,Kim, T.B.,Ahn, H.Y.,Hur, H.Y. 한국재료학회 2006 한국재료학회지 Vol.16 No.3
The sodium/sulfur(Na/S) battery has many advantages such as high theoretical specific energy(760Wh/kg), and low material cost based on the abundance of electrode material in the earth. It has been reported that the electrochemical properties of sodium/sulfur cell above $300^{\circ}C$, utilized a solid ceramic electrolyte and liquid sodium and sulfur electrodes. A lot of researches have been performed in this field. Recently, Na/S battery system was applied for electricity storage system for load-leveling. One of severe problems of sodium/sulfur battery was high operating temperature above $300^{\circ}C$, which could induce the explosion and corrosion by molten sodium, sulfur and polysulfides. In order to develop sodium battery operated at low temperature, sodium ion battery has been studied using carbon anode, and sodium oxides cathodes. However, the energy densities of the sodium ion batteries were much lower than high temperature sodium/sulfur cell. In this study, the sodium/sulfur battery with 1M $NaCF_3SO_3$ is tested at room temperature. The charge-discharge mechanism was discussed based on XRD, DSC, SEM and EDS results.