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과공정 Al-Si 합금에서의 초정 및 공정 Si 의 동시 미세화
박재영,이재상,나형용 ( Jae Young Park,Jae Sang Lee,Hyung Yong Ra ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.3
N/A It is well known what is impossible to refine primary and eutectic Si simultaneously by addition of both Cu-P and Sr(or Na). Because of the formation of compound Sr₃P₂(or Na₃P) in the melt, in the result, both effects disappear. In this study Al-Cu-P alloy that comprises AlP compounds inside is added in the melt with Sr simultaneously. As AlP compounds that act on nucleation sites of primary Si are not formed but added directly an the melt, it is difficult to form Sr₃P₂by reaction with Sr. Therefore it is possible to refine primary and eutectic Si simultaneously in the general casting process by use of Al-Cu-P alloy and Sr.
기계적합금화법에 의한 과공정 Al-Si 합금 미세화제 개발 및 개량효과에 관한 연구
박재영,이재상,나형용 ( Jae Young Park,Jae Sang Lee,Hyung Yong Ra ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Recently Al-Cu-P alloys are used to refine primary Si of hypereutectic Al-Si alloys. Because it has inside AlP compound that acts as nucleation site in the melt, Al-Cu-P alloy has good refinement effect in lower holding temperature and after shoter holding times. In this study Al-Cu-P refinement agent was made by mechanical alloying method. When Al-13.5wt%Cu-1.5wt%P was alloyed mechanically for 30hr in Ar atmosphere by high energy ball mill, it had the refinement effect that showed primary Si size of about 30㎛ in Al-20wt%Si at 760℃, treated for 15min.
부천지역 초등학생의 식품알레르기 발생 실태 및 다른 알레르기질환과의 연관성
박재영 ( Jae Young Park ),박가영 ( Ga Young Park ),한영신 ( Young Shin Han ),신미용 ( Mee Yong Shin ) 대한소아알레르기호흡기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.3
Purpose: This study was performed to evaluate the current status of food allergy (FA) and to analyze the relationship between allergy to individual foods and other allergic diseases in elementary school children. Methods: We performed a questionnaire survey for FA, asthma, allergic rhinitis, and atopic dermatitis using International Study of Asthma and Allergies in Childhood questionnaires. A total of 1,929 students in 3 elementary schools were enrolled. Results: A total of 324 students (16.8%) had ever suffered from FA symptoms more than once. Only 64 out of 324 students (19.8%) were diagnosed with FA by doctors. The presence of soy allergy was associated with the increased risk of bronchial asthma (adjusted odds ratio [aOR], 5.90; 95% confidence interval [CI], 1.87 to 18.59). The presence of egg (aOR, 1.91; 95% CI, 1.04 to 3.52) and wheat allergy (aOR, 5.45; 95% CI, 1.94 to 15.36) were associated with the increased prevalence of allergic rhinitis. The allergic symptoms to fruits/tomato was associated with the increased risk of allergic rhinoconjunctivitis symptoms (aOR, 2.98; 95% CI, 1.18 to 7.47). The allergic symptoms to egg (aOR, 2.29; 95% CI, 1.22 to 4.29), wheat (aOR, 4.91; 95% CI, 1.86 to 12.95), and shrimp/crab (aOR, 2.48; 95% CI, 1.37 to 4.49) were associated with the presence of atopic dermatitis. Conclusion: The prevalence of FA of elementary school students in Bucheon-city was 16.8%. A significant positive association between the suspected foods and the other allergic diseases was found. Soy allergy was significantly correlated to having bronchial asthma and fruits/tomato allergy correlated with allergic rhinoconjunctivitis. (Allergy Asthma Respir Dis 2013;1:266-273)
순차적 환원 방법으로 제조된 백금-팔라듐 촉매의 전기 활성
박재영 ( Jae Young Park ),박수진 ( Soo Jin Park ),정용주 ( Yong Ju Jung ),김석 ( Seok Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.2
본 연구에서 직접 메탄올형 연료전지용 담지 촉매의 전기 화학적 효율을 높이기 위하여 담지 촉매의 합성을 위한 2가지 다른 방법을 조사하였다. 담지 촉매에 있어서 합금을 형성하여 동시 담지하는 방법과 금속을 순차적으로 담지하는 방법을 비교하였다. 금속의 총 함량을 20 wt%를 사용하였으며, Pt-Pd의 금속비를 1 : 2로 하였다. 순환 전류-전압곡선(CVs), TEM 이미지와 XRD분석을 이용하여 두가지 다른 방법으로 제조된 촉매 간의 전기화학적 특성, 입자의 평균 크기 및 결정의 구조 변화를 비교·분석하였다. 그 결과, 순차적 금속 담지 촉매가 동시 담지 촉매보다 단위 무게당 산화전류 수치를 나타내어 보다 높은 전기활성 특성을 보였다. In this study, two different methods were studied to prepare Pt-Pd catalysts for direct methanol fuel cells in order to enhance the electrochemical efficiency. The catalysts were compared with simultaneously deposited Pt-Pd and sequentially deposited Pt-Pd. The electrocatalysts contained 20 wt% of metal loading on carbon black and 1 : 2 of Pt : Pd atomic ratio. Electrochemical properties of the catalysts were compared by measuring cyclic voltammetries and average sizes and lattice parameters were measured by transmission electron microscopy images and x-ray diffraction. As a result, sequentially deposited Pt-Pd/C catalysts showed better electrochemical properties than those of simultaneously deposited Pt-Pd/C catalysts.
부천지역 초등학생의 식품알레르기 발생 실태 및 다른 알레르기질환과의 연관성
박재영 ( Jae Young Park ),박가영 ( Ga Young Park ),한영신 ( Young Shin Han ),신미용 ( Mee Yong Shin ) 대한소아알레르기호흡기학회 1991 소아알레르기 및 호흡기학회지 Vol.1 No.3
Purpose: This study was performed to evaluate the current status of food allergy (FA) and to analyze the relationship between allergy to individual foods and other allergic diseases in elementary school children. Methods: We performed a questionnaire survey for FA, asthma, allergic rhinitis, and atopic dermatitis using International Study of Asthma and Allergies in Childhood questionnaires. A total of 1,929 students in 3 elementary schools were enrolled. Results: A total of 324 students (16.8%) had ever suffered from FA symptoms more than once. Only 64 out of 324 students (19.8%) were diagnosed with FA by doctors. The presence of soy allergy was associated with the increased risk of bronchial asthma (adjusted odds ratio [aOR], 5.90; 95% confidence interval [CI], 1.87 to 18.59). The presence of egg (aOR, 1.91; 95% CI, 1.04 to 3.52) and wheat allergy (aOR, 5.45; 95% CI, 1.94 to 15.36) were associated with the increased prevalence of allergic rhinitis. The allergic symptoms to fruits/tomato was associated with the increased risk of allergic rhinoconjunctivitis symptoms (aOR, 2.98; 95% CI, 1.18 to 7.47). The allergic symptoms to egg (aOR, 2.29; 95% CI, 1.22 to 4.29), wheat (aOR, 4.91; 95% CI, 1.86 to 12.95), and shrimp/crab (aOR, 2.48; 95% CI, 1.37 to 4.49) were associated with the presence of atopic dermatitis. Conclusion: The prevalence of FA of elementary school students in Bucheon-city was 16.8%. A significant positive association between the suspected foods and the other allergic diseases was found. Soy allergy was significantly correlated to having bronchial asthma and fruits/tomato allergy correlated with allergic rhinoconjunctivitis. (Allergy Asthma Respir Dis 2013;1:266-273)
감시림프절 전이 양성인 유방암 환자에서 비감시림프절 전이 예측인자 및 예측체계의 비교 분석
박재영(Jae Young Park),박근명(Keun Myoung Park),박정미(Jeong Mi Park),이강연(Kang Yeun Lee),문연희(Youn Hee Moon),김세중(Sei Joong Kim),김준미(Joon Mee Kim),조영업(Young Up Cho),김장용(Jang Yong Kim),최윤미(Yun-Mee Choe),최선근(Sun K 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.1
Purpose: The purpose of this study was to investigate the predictors of nonsentinel lymph node (NSLN) metastasis in breast cancer and to evaluate the usefulness of the scoring systems and nomograms. Methods: In this analysis, we reviewed the clinicopathologic features of 70 patients who had undergone sentinel lymph node (SLN) biopsy and axillary lymph node dissection. The clinical features of patients, histologic parameters and hormonal receptor status of primary tumor and histopathologic features of SLN metastasis were noted retrospectively. Furthermore, the receiver operating characteristic (ROC) curve was drawn and the area under the ROC curve (AUC) was calculated to assess the discriminative power of the scoring systems and nomograms. Results: The metastatic tumor size in SLN (P<0.001), extracapsular invasion (P=0.002), percentage of positive SLNs among the removed SLNs (P=0.011), primary tumor size (P=0.038) were associated significantly with NSLN metastasis, statistically, in univariate analysis. Based on multivariate logistic regression, the metastatic tumor size was the only prognostic factor of NSLN metastasis (P=0.012). The AUC of Memorial Sloan-Kettering Cancer Center scoring system was greater than other systems, significantly (P=0.004). Conclusion: We have shown in this study that it would be possible to predict NSLN status based on the metastatic tumor size in SLN. Although the significance was not achieved in multivariate analysis, the size of primary tumor, extracapsular invasion of metastasis in SLN, percentage of positive SLNs among the removed SLNs had the potential to be a predictive factor of NSLN metastasis. MSKCC scoring system appears to be more effective and accurate than other scoring systems for selecting patients for whom axillary lymph node dissection can be avoided.
리듬운동 프로그램이 여성 고령자들의 Cobb"s 각과 골반기울기 및 활동체력에 미치는 영향
박재영(Jae-Yong Park),안병오(Byoung-Oh Ahn),박성현(Sung-Hyun Park),이태용(Tae-Yong Lee),박정배(Jeong-Bae Park) 한국엔터테인먼트산업학회 2015 한국엔터테인먼트산업학회논문지 Vol.9 No.2
본 연구는 여성노인을 대상으로 12주간 리듬운동 프로그램이 노인의 Cobb"s 각, 골반기울기 및 활동체력에 미치는 영향을 분석하기 위하여 실시되었다. 동일한 지역의 노인정에서 총 24명의 노인분들이 참여하였다. 운동그룹(n=12)은 하루 50-60분의 리듬운동 프로그램을 12주간 주당 3회 실시하였으며 통제그룹(n=12)은 정규적 사회활동과 운동에 참석하지 못하도록 관리되었다. 연구 결과를 살펴보면 12주간 리듬운동 프로그램 실시 후 운동그룹의 Cobb"s각과 골반기울기에 감소하는 경향이 나타났지만 통계적 유의성은 없었다. 그리고 12주간 리듬운동 프로그램 실시 후 통제그룹에서 차이가 없었지만, 운동그룹의 대퇴굴곡 근력과 무릎굴곡 근력 그리고 윗몸 앞으로 굽히기와 6분 걷기 거리가 유의하게 증가하였고 (p<0.5), 5회 의자에서 일어서기 시간과 10m 보행수는 유의하게 감소하였다(p<0.5). 이상의 결과를 종합해 볼 때 사회적 활동이 없이 일상의 대부분을 노인정에서 생활하는 노인들에게 적용할 수 있는 리듬운동 프로그램이 노인들의 활동체력을 향상시켜 일상생활의 장애 및 낙상 예방에 도움을 줄 수 있을 것으로 사료된다. The study was designed to examine effect of 12 weeks of rhythm exercise program on Cobb"s angle, pelvis tilt, and functional fitness in elderly women. 24 subjects were participated in this study living at a elderly home located in local city. There were exercise group(n=12), and control group(n=12). Rhythm exercise program was executed for 50-60 minutes a day, 3 times a week during 12 weeks. Repeated measure ANOVA was used to analyze the effect of rhythm exercise program. The analysis of data revealed the following findings. First, Cobb"s angle(9.5%) and pelvis telt(22.7%) were decreased respectively in exercise group, but there was not significance. Second, Strength of hip flexion(24.2%) and strength of knee flexion(20.9%) were significantly increased in exercise group after 12weeks. Third, After 12 weeks of rhythm exercise program, Chair stand and gait step were significantly improved in exercise group. Sit and reach and the distance of 6min walk were significantly increased in exercise group. In conclusion, older women who had inactive lifestyle were positively improved on muscle strength and living physical fitness. therefore it was considered that rhythm exercise program was effective program for the frail older women to improve the capacity of daily living.