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반복 일축응력하의 알루미나 파괴거동에 미치는 압축응력의 영향
김기태,서정,백성기,Kim, K.T.,Shu, J.,Baik, S.K. 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.9
The effect of cyclic compressive stress on fracture responses of Al2O3 was investigated under uniaxial stress cycling. Experimental data were obtained for Al2O3 tension specimens under uniaxial tension-unloading and tension-compression cyclic loading conditions. To investigate the effect of compressive stress on the crack growth, theoretical results from the crack growth rate were compared with measured stress vs. failure relations. At low stress level in tension-compression cycling, residual tensile strains were also observed about failure time.
김기태,손건석,서정,Kim, K.T.,Son, G.S.,Suh, J. 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.2
The effects of cyclic stress, frequency and bias-pressure on densification of Al2O3 powder cyclic compaction are investigated. The effect of frequency was not significant on densification of Al2O3 powder under cyclic compaction. The higher the cyclic stress and the lower the bias pressure, the higher densification was achieved. To obtain a higher densification, cyclic compaction was more efficient than 1 stroke compaction. A densification equation was proposed to describe an cyclic time dependent pressure-volume relation for Al2O3 powder under cyclic compaction. This equation was obtained empirically, based on the pressure-volume equation proposed by Cooper and Eaton, the time dependent densification equation by Kim and Suh and experimental data for Al2O3 powder under cyclic compaction. The agreement between the proposed equation and experimental data for Al2O3 powder under cyclic compaction was very good.
Delayed Lesions on Diffusion-Weighted Imaging in Initially Lesion-Negative Stroke Patients
김기태,Beom Joon Kim,Jaewon Huh,Seong Kyu Yang,Mi Hwa Yang,Moon-Ku Han,Cheolkyu Jung,Byung Se Choi,Jae Hyoung Kim,Hee-Joon Bae 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.1
Background and Purpose: Lesions on diffusion-weighted imaging (DWI) occasionally appear on follow- up magnetic resonance imaging (MRI) among initially DWI-negative but clinically suspicious stroke patients. We established the prevalence of positive conversion in DWI-negative stroke and determined the clinical factors associated with it. Methods: This retrospective, observational, single-center study included 5,271 patients hospitalized due to stroke/transient ischemic attack (TIA) in a single university hospital during 2010 to 2017. Patients without initial DWI lesions underwent follow-up DWI imaging as a routine practice. Adjusted hazard ratios (aHRs) for recurrent stroke risk according to positive conversion were determined using Cox proportional hazard regression. Adjusted odds ratios (aORs) and 95% confidence intervals (CIs) for positive conversion among initially DWI-negative patients were estimated. Results: In total, 694 (13.2%) patients (mean±standard deviation age, 62.9±13.7 years; male, 404 [58.2%]) were initially DWI-negative. Among them, 22.5% had positive-conversion on follow-up DWI. Positive conversion was associated with a higher risk of recurrent stroke (aHR, 3.12; 95% CI, 1.56 to 6.26). Early neurologic deterioration (aOR, 15.1; 95% CI, 5.71 to 47.66), atrial fibrillation (aOR, 6.17; 95% CI, 3.23 to 12.01), smoking (aOR, 3.76; 95% CI, 2.19 to 6.63), pre-stroke dependency (aOR, 1.62; 95% CI, 1.15 to 2.27), objective hemiparesis (aOR, 4.39; 95% CI, 1.90 to 10.32), longer symptom duration (aOR, 2.17; 95% CI, 1.57 to 3.08), high cholesterol (aOR, 4.70; 95% CI, 1.78 to 12.77), National Institutes of Health Stroke Scale score (aOR, 1.44; 95% CI, 1.08 to 1.91), and high systolic blood pressure (aOR, 1.01; 95% CI, 1.00 to 1.02) were associated with a higher incidence of lesions with delayed appearance. Regarding the location of lesions on follow-up DWI, 34.6% and 21.2% were in the cortex and brainstem, respectively. Conclusions: In DWI-negative stroke/TIA, positive conversion is associated with a higher risk of recurrent stroke. DWI-negative stroke with factors related to positive conversion may require followup MRI for a definitive diagnosis.
김기태,정진화,Kim, Ki-tae,Jung, Jin-hwa 대한한방내과학회 2016 大韓韓方內科學會誌 Vol.37 No.5
Objective: To examine the effects of Hyeongbangdojeok-san-gami (荊防導赤散加味方) which has been used in asthmatic patients in Korean Medicine. Methods: Five asthmatic patients were enrolled who had visited Semyung University Korean Medical Hospital from July 1, 2015 to June 30, 2016. They were examined by a pulmonary function test and completed the Quality of Life Questionnaire for adult Korean Asthmatics (QLQAKA) before and after taking Hyeongbangdojeok-san-gami for 3 weeks. All data were analyzed by paired t-tests. Results: After treatment with Hyeongbangdojeok-san-gami for 3 weeks, Forced Expiratory Volume 1 sec (FEV 1.0) improved significantly (p=0.01) and Peak Expiratory Flow (PEF) showed an increase of 20% in results examined by Pulmonary Function Test (PFT). The results of the QLQAKA indicated that the main improvements occurred in theitems associated with theactivity domain. Conclusions: This study suggests that Hyeongbangdojeok-san-gami is effective in improving pulmonary function and quality of life in patients with asthma. More extensive study is needed in the future.
주조된 AI 합금의 기계적 성질에 미치는 HIP의 영향
김기태,양훈철,최재윤,Kim, Gi-Tae,Yang, Hun-Cheol,Choe, Jae-Yun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.3
The present paper investigates the effect of hot isostatic pressing (HIPing) on mechanical properties, e.g., tensile strength, ductility and impact absorption energy of sand and die casted aluminum alloys. After HIPing at various temperatures and pressure conditions, uniaxial tensile test and Izod impact test of the samples were carried out. The experimental results showed improvements in uniaxial tensile strength, elongation and Izod impact toughness of sand casted aluminum alloy, while deterioration of a tensile strength fur die casted aluminum alloy. The effect of HIPing for microstructure of the cast aluminum alloy was also investigated.
오피니언 - 우리 농업인.농촌.농업이 진정 잘 살아야 한다
김기태,Kim, Gi-Tae 한국작물보호협회 2012 자연과 농업 Vol.275 No.-
농업과 농촌에 대한 자긍심과 자신만의 철학이 없이는 잘 산다기에는 부족하다. 자연과 친화적으로 사는 방법을 우리는 배워야 한다. 그래야 농촌관광을 찾아오는 도시민들도 감화를 받고, 우호적으로 된다. 여건을 바꾸는 작은 실천을 부지불식간에 하는 것이다.