薄板 spring back에 관한 硏究

白南柱,金南植 부산대학교 공과대학 1981 硏究報告 Vol.22 No.-

薄板의 塑性굽힘 加工에서, 스프링 백은 아주 複雜하고 어려운 問題로 잘 알려져 있다. 本 論文에서는 스프링 백을 plane stress와 plane strain 理論으로 區分하여 解析하고 V型 다이와 펀치로서 굽힘 實驗을 하여 다음과 같은 結論을 얻었다. 1. 굽힘변형과정은 2種類의 形式으로 大別되며 제각기 서로 다른 스프링 백의 변형특성을 나타낸다. 2. 스프링 백은 굽힘 荷重에 影響을 받으며 그 程度는 R/t의 크기에 관계한다. 3. 理論解析에서 얻어진 結果와 實驗은 잘 일치한다. In this plastic bending of sheet Metals, spring back is a well-known phenomenon as a very complex and different problem. In this report, the author deals with experimentally the process of deformation in the plastic bending of sheet metals with the V-die and punch and effects of various factors on the spring back in the matter mentioned above. The results obtained as follows: ⅰ) the process of deformation in bending was divided into two main types, each of which had the respective change of spring back. ⅱ) Spring back was mainly influenced by bending load, but the degree of its influence was depended on the ratio of the radius R at the extreme point of punch to the thickness t of sheet metals. ⅲ) the results obtained in the theoretical analysis are well agreed with the experiments.

인체 무게 중심 분할에 따른 500m 숏트트랙 스피드 스케이팅 출발 기술 분석

백진호,정남주,한기훈,이용구,윤동섭,이용식,Back, Jin-Ho,Chung, Nam-Ju,Han, Ki-Hoon,Lee, Yong-Goo,Yoon, Dong-Seob,Lee, Yong-Sik 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3

The purpose of this study was to attempt new starting motion and supply present starting motion in the 500M short track speed skating according to the center of gravity position. The center of gravity position ratio was divided starting motion into five(type A : front 80%-back 20%, type B front 70%-back 30%, type C : front 50%-back 50%, type D : front 30%-back 70%, type E : front 20%-back 80%). The three dimension motion analysis with DLT(direct linear transformation) method was executed using two video cameras. The following conclusion was that It was appear that reaction and execution time in starting motion was the most short in type B. It was characteristic that step of skaters was shorten and center of gravity position ratio was not effect to change of the step in each event. It was appear that the displacement of type D and type E were longer than that type A and type B during the starting motion. It was appear that skill types of center of gravity position ratio to the front were lower than that to the back and contract a posture. Observing the above, it was conclusion that skill type B of center of gravity position ratio to the tent was more effect than that to the back. But it is important that these skill type was most used to the competition and estimate the result.

도재표면 처리제가 복합레진과 도재와의 결합에 미치는 영향

백명주,박주미,배태성,박찬운 全北大學校 齒醫學硏究所 1991 전북치대논문집 Vol.9 No.1

This study investigated the effect of porcelain primer on bonding of composite resin to porcelain surface. In order to test the bond strength between porcelain and composite resin, porcelain cylinders were embedded in acrylic resin, and polished with 240grit silicone carbide paper. The specimens were divided into twelve groups. All specimens were treated with three porcelain primers and bonded with five composite resins. All test groups were stored in 37℃ distilled water for 48hours. Shear bond strengths were measured with Instron(Model 4201) at a cross-head speed of 1㎜/min. The obtained results were as follows : 1. Scotchprime/SiluxⅡ group and BISCO Porcelain Primer/Bisfill group showed significant higher bond strengths than Clearfil Porcelain Primer/Photo clearfil Bright group(p<0.05). And there was no significant differences in bond strengths between Scotchprime/SiluxⅡ group and BISCO Primer/Bisfill group(p>0.05). 2. When composite resins were used with Scotchprime, the bond strengths were decresed SiluxⅡ(16.68±3.35 MPa), Bisfil(16.23±4.54 MPa), Poly-Fill(14.74±4.08 MPa), Photo Clearfil Bright(13.75±2.89 MPa) and Pekalux(14.74±4.08 MPa) in order, but there was no statistical significance(p>0.05). 3. When composite resins were used with BISCO Porcelain Primer, the bond strength were decreased Bisfil(16.17±1.60 MPa), SiluxⅡ(12.13±2.37 MPa), Poly-Fill(10.78±1.99 MPa), Photo Clearfil Bright(9.91±4.59 MPa) and Pekalux(7.36±2.16 MPa) in order, but there was no statistical significance(p>0.05). 4. SiluxⅡ, Photo Clearfil Bright and Poly-Fill used with Scotchprime showed significant higher bond strengths than BISCO Porcelain Primer(p<0.05).

근적외선 분광분석법을 이용한 당화혈색소의 측정 및 혈당측정과의 관계

백주현,김효진 동덕여자대학교 종합약학연구소 2003 동덕약학연구지 Vol.7 No.-

Measurement of hemoglobin A_(1c) (glycated hemoglobin) has been recommended for the long-term assessment of glycemic control in diabetic patients. Near infrared spectroscopy and partial least square (PLS) regression were applied to the quantitative analysis of physiological hemoglobin A_(1c) (Hb A_(1c)) level from diabetics. Standard errors of calibration (SEC) and standard errors of prediction (SEP) was 0.69, 0.85, respectively. Calibration R value for calibration and prediction was 0.8882, 0.8834, respectively. We suspected Hb A_(1c) as a critical influence factor on non-invasive blood glucose measurement, because it is formed by the irreversible combination of glucose with the N-terminal of a β-chain. The study was carried out in diabetics by PDA type NIR spectrometer with a fiber optic probe. PLSR and error grid analysis (EGA) were applied to determine only blood glucose level and HbA_(1c) compensated-blood glucose level. Calibration result of glucose level including HbA_(1c) was better than the other. It showed probability of non-invasive HbA_(1c) measurement and reliability of non-invasive blood glucose monitoring accuracy.

龜谷 崔奇男의 詩世界

金周伯 槿域漢文學會 1991 한문학논집(漢文學論集) Vol.9 No.-

1945년 한반도에서 일본군의 '본토결전' 준비 : 편제와 병사노무동원을 중심으로 The Organization, and the soldiers enlisted as Laborers

신주백 한국역사연구회 2003 역사와 현실 Vol.- No.49

The Japanese troops that were stationed at the Korean peninsula were generally referred to as the 'Korean Contingent', but the contingent's formal designation was changed to 'The Headquarters for the Korean Detachment' in February 1945. The Detachment was also named in charge of the 17th Areal Forces, along with responsibilities for munitions and battle readiness as well. The 17th Areal Forces received reinforcement from China and Japan, indicating that the Japanese' main concentration in this time period was actually upon counteracting the expected attacks of the American forces rather than the Soviet forces. This kind of strategic change was the only mission change for the Japanese troops in this region since they had been established here in 1905. The Japanese forces were facing two major problems as they were preparing for a grand assault upon the Korean peninsula. One was the issue of chain of command between the Gwandong area forces and the 17th Areal Forces. Neither one was a subordinate to the other, but the issue was raised by the Gwandong forces which had to prepare for operations against the Soviet forces in the Northern area of the peninsula. Eventually the Chosun Governor-General and the Commander in chief of the 17th Areal forces layed out a ruling against the Gwangdog forces' position, and also the Emperor was against the idea syggested by the Gwangdong forces. This controversy was a demonstration of the internal situation of Japanese troops, and was also an example of a colony in a particularly fluctuating situation forcing the main land authorities to act accordingly. The other problem was to prepare munition and food supply for the conscripted over 4 hundred thousand Chosun men, but most of these men ever-weakened inner control of the Japanese imperialism at the time. The fact that the major conscription going on at the time was to secure workforce(which would be positioned at oversea areas) should be noted, and inner stages of this period should be suggested on that basis.

JU 동작치료가 뇌졸중 편마비환자의 통증과 우울에 미치는 영향

전현주(Jeon, Hyun-ju),백정희(Back, Jung-Hee) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.3

This study aimed to investigate the effects of JU Movement Therapy on the pain and depression relief of hemiplegic stroke patients. A total of 24 in patients diagnosed with hemiplegic stroke at R hospital from March to June 2012 were sampled for the study. We first evaluate the general characteristics and subjective symptoms of research participants and then A pre-test was conducted by performing physical an examination on individuals who suffer from pain. The degree of patients’ subjective pain and depression of sample and control groups by Visual Analogue Scale(VAS) and Self Rating Depression Scale. The average and standard deviation of all the variables was first calculated by using SPSS (Ver 18.0) and then paired t-test was conducted to compare the difference between before and after among groups. Finally, the result was analyzed using independent t-test. The level of statistical significance for all tests was p<.05 and the results of studying were as follows: There was decrease of VAS between sample and control groups after experiment. This was the significant difference. Also there was no significant difference in VAS between sample and control groups before the experiment but there was the significant difference after experiment(p=.025). The factors related to physical symptoms on the Depression scale in the sample group showed a significant difference before and after the experiment (p=.015). Factors on psychiatric symptoms also showed significant differences between the pre-and post-test(u=.001)

여자 500m 쇼트트랙 스피드 스케이팅의 스타트 기술분석

백진호,곽창수,정남주 한국운동역학회 2004 한국운동역학회지 Vol.14 No.3

J. H. BACK, C. S. KWAK, N. J. CHUNG. Analysis of the Female 500m Sprint Starting Motion in Short Track Speed Skating. Korean Journal of Sport Biomechanics, Vol. 14, No. 3, pp. 285-299, 2004. The purpose of this study is to identify female 500m sprint start motion by the center of gravity position in short track speed skating. The center of gravity position ratio was divided into three type(type A front : 80%-back : 20%, type B front : 70%-back : 30%, type C front: 50%-back : 50%). Three video cameras were used for 3D motion analysis with DLT method and the results were as follows: The elapsed time in starting motion was appeared that type B was the shortest and type A was the longest. It was appear that the stroke length of type A was longer than that type B and C during starting phase. This result was similar to displacement of center of gravity. It was appeared that skill type of center of gravity position ratio type B' ankle and knee joint angle were lower than that of type A and C. Observing these results it was conclusion that skill type B of center of gravity position ratio was more faster than that of type A and C. But it is important that these skill type needed to verifying more subjects.

A Cross-cultural Understanding of Korean Students in the British Academic Context

( Ju Hyun Back ) 대한언어학회 2010 언어학 Vol.18 No.3

A case of advanced-stage endometrial stromal sarcoma of the ovary arising from endometriosis

( Ju A Back ),( Myeong Gyune Choi ),( U Chul Ju ),( Woo Dae Kang ),( Seok Mo Kim ) 대한산부인과학회 2016 Obstetrics & Gynecology Science Vol.59 No.4

Endometrial stromal sarcoma (ESS) is a rare malignancy. Development of extrauterine ESS form endometriosis is particularly rare. The majority of extrauterine ESS occurs in areas with preexisting endometriosis. The most common site is the ovary. We experienced a case of ESS of the ovary that arose from endometriosis with multiple disseminated lesions. This disease was managed by total abdominal hysterectomy, bilateral salpingo-oophorectomy, both pelvic lymph nodes dissection, omentectomy, and appendectomy followed by postoperative high-dose progesterone therapy. Here, we report this case with literature review.