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- 저자 : 具滋薰 (검색결과 339 건)
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동심원관 제트유동장내에서 초음파에 의한 난류증진에 관한 연구
구자훈,박영호,이상범,주은선 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-
A study on the turbulence enhancement by ultrasonic vibration was dealt with an experiment on flow characteristics with ultrasonic forcing in a jet field of coaxialcircular pipe. A large transparent acryl tank and a coaxial circular pipe nozzle were made for the above research. Experimental data have been obtained using PIV. City water of 25℃ was selected as an experimental liquid and the front flow field of the coaxial circular pipe was divided horizontally as 3 measuring regions to observe characteristics of flow phenomena. Characteristics of fluid flow such as velocity vector distribution, kinetic energy, turbulent intensity and etc. were visualized, observed, examined and considered at 3 kinds of Re No. such as Re=2×10³, 3×10³ and 5×10³. In result, it was proved that ultrasonic vibration affected the enhancement of turbulent flow.
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具滋薰,趙南根,李相範 慶北大學校 醫科大學 1977 慶北醫大誌 Vol.18 No.2
1966年 8月부터 1977年 7月末까지 滿 11年間 本 慶北醫大 附屬病院 小兒科에 急性 絲球體 腎炎으로 入院했던 患兒 123例에 對한 臨床的 觀察을 하였다. 1) 急性 絲球體 腎炎 患兒數는 123例로 同 觀察期間中 總 入院 患兒의 2.8%에 該當하고 年度別로는 1972年 및 1976年이 가장 많았으며 季節的으로는 9月부터 2月까지가 77.4%로 가장 많았다. 2) 男女比는 1.8:1이었고 年齡은 4∼9歲가 59%로 半數以上을 차지하였고 3歲以下에서는 드물었다.(3%) 3) 先行 病患으로는 上氣道炎이 69%로 가장 많았고 其他 皮膚感染, 猩紅熱, 耳下腺炎, 中耳炎등이있고 未詳이 22%였다. 4) 入院 當時 臨床症狀으로는 浮腫이 82.1%로 가장 많았고 血尿 61.8%, 發熱 33.3%였다.그리고 發病 10日以內 入院할 수 있었던 例가 全體의 55%를 차지하였다. 5) 入院 當時 大多數에서 蛋白尿, 尿中 赤血球가 陽性이었고 Cast는 31.7%에서 볼수 있었다. 6) 血沈速度의 促進이 72.4%였고 26.9%에서 輕度의 質血을 볼 수 있었다. BUN은 15mg% 以上이 71%였고 Cholesterol은 大部分이 正常 範圍內에 있었다. A.S.O titer는 333 Todd Unit 以上이 51.6%였다. 7) 咽喉 培養檢査에서 베타 溶血性連鎖狀球菌을 培養할 수 있었던 例는 3例로 2.4%에 不過하였다. 8) 血壓 上昇은 (弛緩期血壓 90mmHg以上) 54.5%에서 볼 수 있었다. 9) 胸部 X線 所見은 肺陰影 增加가 37.5%, 肺浮腫 3.6%, 心肥大 18.7%, 肋膜渗出 11.5%였다.(正常 X線 所見은 28.6%였다.) 10) 合倂症은 9.7%에 該當하는 12例에서 볼수 있었으며 그中 高血壓性 腦症이 10例, 心不全症이 2例였으며 尿毒症은 1例도 없었다. 11) 退院 當時 好轉한 例는 81.3%였고 그 大部分이 2週以內였다. 追後 觀察이 可能했던 例中에서 1年以上 尿檢査上 異常 所見(血尿등)을 보인 境遇가 2例 있었으며 同 觀察 期間中 死亡한 例는 1例도 없었다. Clinical observation has been madeon 123 childrens with acute gromerulonephritiso who was admitted to the pediatric Dpt. of Kyung-Pook University hospital during 11 years period from August '66 to July '77. 1) Total case number was 123, comprising 2.8% of hospilal admission to pediatric department, during the same observation period. Peak incidence was noticed on cold months, form September to February. (77.4%) 2) Boys were affected about twice of-terner than girls (1.8:1) with peak in 4-9 yrs of age group (59%). Affected rate below 3 year of age was very low (3%). 3) URI was the most common preceding illness(69%), followed by skin infection, scarlet fever, parotitis, otitis media, etc.. In 22% no previous illness could be elicitable. 4) Chief complaints at the time of admission were as follow, in debreasing order of frequency,: facial edema 82.1% hematuria 61.8% and fever 33.3%. And more than half (55%) of the cases were admitted within 10 days after the onset of the illness. 5) Laboratory data at the time of admission; Urinalysis; almost all of the cases showed proteinuria&hematuria, and various casts were seen in 31.7%. Elevated ESR was seen in 72.4% with mild anemia 26.9%, BUN over 15 ㎎% 71%, and normal cholesterol value in the majority of patients. ASLO titer over 333 Todd unit was found in 51.6% of the cases. However, positive culture of the group A b-hemolytic streptococcus was seen in only 3 cases (2.4%) 6) Diastolic hypertension over 90 ㎜Hg was seen in 54.5%. 7) Chest X-ray findings showed; Increased vascular marking 37.5%, pulmonary edema 3.6%, cardiomegaly 18.7%, pleural effusion 11.6%, In 28.6%, the findings was interpreted as normal. 8) Complication occurred in 12 cases (9.7%), with hypertensive encephalopathy in 10 cases, and heart failure in 2 cases. No case of renal failure was seen. 9) Majority improved at the time of discharge (81.3%) usually within 3 weeks. Only 2 cases continued to reveal abnormal urinalysis (eg. hematuria, etc.) over 1 year in whom long term follow-up were possible, and no case fatality was seen.
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Energy-based Beta Peak Extraction from Dynamic Resistance Curves
구자훈,박영도,구남국 대한용접접합학회 2022 대한용접·접합학회지 Vol.40 No.5
Recently, the importance of welding monitoring is emerging, and in particular, many studies using characteristic values of dynamic resistance curves are being conducted. Among the characteristic values, β-peak, peak on the dynamic resistance curve, contains important information on the extent to which the nugget grows. A common way to extract the β-peak is to determine the local maximum point followed by the local minimum point in the dynamic resistance curve. However, for dynamic resistance curves where local extremum values are unclear, extracting the β-peak in this manner is difficult. Therefore, in this study, a method using heating energy for β-peak extraction was proposed. Heating energy is the energy used until the β-peak is reached. Typically heating energy does not significantly differ even if the welding conditions differ for the same material. Based on the results, the β-peak of the dynamic resistance curve without the clear peak was extracted, and 11 characteristic values were calculated. Among them, three values that had a high correlation with the nugget diameter were selected. Using these values, the nugget diameter was predicted through linear regression analysis.
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