휠체어 디자인 특성에 따른 효율의 차이 규명

임비오,문영진,은선덕 한국운동역학회 2003 한국운동역학회지 Vol.13 No.1

Lim, B-O · Moon, Y-J and Eun, S-D. Analysis on the differences of mechanical efficiency from design characteristics of wheelchair. Korean Journal of Sport Biomechanics Vol. 13, No. 1,pp. 109-119.'2003 Korean Society of Sport Biomechanics proceedings. The purpose of this study was to investigate differences of the mechanical efficiency of the characteristics of the basketball wheelchairs(cambers & size of the handrims). Nine mechanical efficiency on the characteristics of the basketball wheelchairs(cambers 7 size of the handrims). Nine healthy and normal wheelchair basketball players who had no impairments to their upper extremities were volunteered to participate in this study. VO_2 was collected using automatic gas analyzer(vmax29). Gross efficiency, net efficiency and work efficiency were analyzed from the calculated external power output and energy expenditure. The results were followed. First, gross efficiency in the basketball wheelchairs was observed across the range form 4 to 10%. Gross efficiency in this study showed less values than that from the literature reviewed in the arm cranking(15%), racing wheelchair(above 30%), gait(27%) and cycling(18-23%). Second, the small size of handrim(61cm) at the 16 degrees of camber produced higher efficiency values than the large size of handrim(66cm) whereas the different sizes of handrim at the 20 degrees of camber did not show any pattern. Third, both faster speed(1.11㎧→1.39㎧) and increase in treadmill inclination produced increases in energy expenditure. The results of this study may provide not only better understanding of the mechanical efficiency with adequate camber degree and proper size of handrim but also fundamental information for manufacturing the wheelchair.

Influence of heat‑treated Al-Si coating on the weldability and microstructural inhomogeneity for hot stamped steel resistance nut projection welds

Eun‑Joon Chun,Sung‑Sang Lim,Young‑Tae Kim,Ki‑Sung Nam,김영민,Young‑Whan Park,Siva Prasad Murugan,Yeong‑Do Park 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

Resistance nut projection weldability of Al–Si coated hot stamped steel (HSS) was investigated under the viewpoint of weldablecurrent range and joint strength (pull-out load). The microstructural inhomogeneities in the welds were also studied inorder to elucidate the factors affecting the joint strength of the welds. The weldability of the given Al–Si coated HSS wascompared with the weldability of an identical HSS without the Al–Si coating (Al–Si coating was polished out) and Zn coateddual phase steel. The weldable current range of Al–Si coated HSS was found to be narrower than that of the other materials. Furthermore, the average pull-out load within the weldable current range of the Al–Si coated HSS was the lowest among thethree materials. The reason for poor weld mechanical property of the Al–Si coated hot-stamped steel was attributed to themicrostructural inhomogeneities such as unmixed Al–Si coating layer at the edge of the nugget and the second phase Fe3(Al,Si) intermetallic compound. The formation of Fe3(Al, Si) phase was attributed to the solidification segregation of Al and Siduring the weld solidification and was confirmed with the numerical analysis of solidification segregation.

운동이 안면두개골의 형태에 미치는 영향

임은경,최영철 大韓小兒齒科學會 2003 大韓小兒齒科學會誌 Vol.30 No.4

호흡기능 또는 근기능이 얼굴의 구조적 관계에 미치는 영향을 평가하고자 어려서부터 한가지 운동종목을 전공하여 온 체육대학 학생 137명을 운동의 유형에 따라, 지속적으로 심폐지구력이 많이 요구되는 운동군(1군), 심폐지구력이 많이 요구되기는 하나 1군보다는 적게 요구되는 운동군(2군), 그리고 순간적인 근력이 크게 요구되는 운동군(3군)으로 분류하고, 정모 및 측모 방사선사진을 계측학적으로 평가하여 다음과 같은 결론을 얻었다. 1. 머리너비길이지수는 모두 단두개에 속하였으며, 각 군간에 유의한 차이가 없었다(p>0.05). 2. 1군과 2군의 얼굴지수는 유의한 차이가 없었으나(p>0.05), 1군과 3군간, 2군과 3군간에는 현저한 차이가 있었다(p>0.05). 3. 얼굴지수와 높은 상관관계를 지닌 각 군의 계측항목은 전하안면높이(상관계수: 0.63∼0.69, p>0.001, 총안면높이, 전상치조높이, 전하치조높이 및 총안면두기높이 등이었다. 4. 3군의 두 개계측치는 전면안면높이(상관계수: 0.36∼0.55, p>0.001) 및 전하안면높이(상관계수: 0.31∼0.56, p>0.001)와 높은 상관관계를 나타냈다. 5. 1군과 2군은 얼굴의 수직 계측치가 전반적으로 컸고, 3군은 수평 계측치가 크게 나타나는 경향을 보였다. The purpose of this study was to investigate differences in craniofacial characteristics of professional sportsmen who have practiced since their prepubertal periods. From the standardized lateral and P-A cephalograms of 137 aportsmen, 7 angular, 19 linear, 4 ratio, and 2 index measurements were measured and evaluated by means of statistical methods. The samples were divided into three groups: Group 1; ice hockey(n=17), football(n=27), basketball(n=16), Group 2; baseball(n=16), gymnastics(n=13), and Group 3; judo(n=18), ssireum(n=10), weight lift(n=20). The results were as follows: It seemed obvious that the cephalic indices of the 3 groups exhibited brachycephalic headform (Group 1; 0.85±0.04, Group 2; 0.85±0.04, Group 3; 0.83±0.06) and there was no statistical difference among the groups(p>0.05). The facial indices of the Group 1 (0.93±0.05) and Group 2 (0.93±0.04) exhibited difinite leptoprosopic facial forms while the Group 3 (0.90±0.04) showed more or less euryprosopic facial form, and there appeared significant difference between the Group 1 and 3 (p<0.05), and also between the Group 2 and 3 (p<0.05). There appeared strong relationships between the facial indices and the facial axis angle, mandibular plane angle, total craniofacial height, total facial height, upper anterior dental height, lower anterior dental height, mandibular length, lower anterior facial height ratio, and especially with lower anterior facial height (p<0.01). It seemed that more of the vertical facial measurements of the Group 1 and 2 appeared to be larger than those of the Group 3.

Chlorhexidine varnish가 법랑질의 탈회예방에 미치는 영향

임은경,최영철 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4

The intention of this study was to investigate the preventive effect of chlorhexidine varnish on enamel demineralization. The sample consisted of 57 first premolars scheduled to be extracted for orthodontic purposes. The control group (N=10) was left untreated and the experimental groups were worn with specially designed stainless steel orthodotic bands on premolar for plaque accumulation. The group(N=9) was worn band only, the group 2 (N=19) was applied with chlorhexidine varnish for one time, and the group 3(N=19)was applied with chlorhexidine varnish for 3 times once a week. After 4 weeks of experimental periods, every specimenwere examined by SEM and Vickers hardness test to evaluate and compare the degree of enamel decalcification. The results were as follows: 1. Although SEM revealed various degree of enamel demineralization in every experimental groups, the group 1 showed more severe demineralizations than the group 2and 3. 2. The mean Vickers Hardness Numbers measured in this study seemed to reveal that there was a statistically significant difference between the control goup and the group 1 (p<0.05), and also a significant defference between the group 1 and the group 2,3(p<0.05). And there was no significant difference between the group 2 and the group 3 (P>0.05). 3. The results of VHN did not deemed to show a statistically significant difference between maxillary premolar and mandibular premolar in both group 2 and group 3 (p>0.05).

티타늄 상에 강유전성 barium titanate 박막 형성과 분극처리에 의한 유사체액 내에서의 calcium phosphate 생성 증진

박영준,이용렬,황규석,김은주,임용무,이기헌 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.2

This study was performed to fabricate a ferroelectric barium titanate (BaTiO₃, BTO) thin film on Ti substrate and to evaluate the effect of poling treatment for the improvement of calcium phosphate (Ca-P) formation. BTO thin-film was spin-coated on Ti substrate by dipping-pyrolysis technique using coating sol obtained by mixing Ba-naphthenate and Ti-naphthenate as starting substances. Pre-heating temperature of the BTO thin film was performed at 500℃ because organic-solvent was completely volatilized without any crystal growth, and the final heat treatment was performed at 600, 650, 700, 750, 800, 850℃, respectively. By repeating the coating and pre-heating procedure gor 20 times, homogeneous thin film of 0.7㎛ thickness could be fabricated, and it performed well during the poling treatment without breakdown. The final heating treatment of the BTO thin film at 750℃ produced a homogeneous crystalline structure without heterogeneous TiO₂formation, which was confirmed by field emission scanning electron microscope (FE-SEM) and X-ray diffraction analyser (XRD). An average grain size of 20∼30 ㎚ were confirmed by SEM observation. The final heat-treated BTO thin-films were polarized (Ep = 5 V/㎛) from 160℃ to 25℃ in heating chamber for 2 h. The negatively poled BTO thin film (N-BTO), non-poled BTO thin film (BTO), Ti substrate (Ti), and 600℃ heat-treated Ti (Ti-O) were immersed in SBF and Eagle's MEM solution for 15 days at 37℃. After the immersion period, the morphological and compositional changes of the surfaces were investigated using a FE-SEM and an energy dispersive X-ray spectrometer (EDX). After immersion in simulated body fluid (SBF), sodium chloride (Nacl) crystals were formed on Ti, Ti-O, and BTO surfaces due to anion adsorption (Cl), while Ca-P crystals were formed on N-BTO surfaces. We assumed that rapidly adsorded cations (Ca²□ ions) on the negatively charged surface at the initial stage acted as nuclei for the formation of Ca-P crystals. In MEM, sodium chloride (NaCl) was formed on Ti, and Ca-P layer including NaCl was formed on Ti-O. Weak and sparse Ca-P layers were formed on BTO, while thick, homogeneous, and dense Ca-P layer was formed on N-BTO, which was confirmed by FE-SEM and EDX. These results demonstrated that introducing a N-BTO on Ti is an effective method for the improvement of Ca-P formation in SBF and MEM. In conclusion, negatively charged ferroelectric BTO thin-film on Ti would improve the possibility of implant osseointegration.

강유전성 BaTiO₃의 분극처리에 의한 유사체액 내에서 Calcium Phosphate 생성

송종은,김은주,황규석,임용무,박영준 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.4

Barium titanate (BaTiO3; BTO) has wide application in industry, particularly in the manufacturing of dynamic random access memory chips, electro-optical switches, optical modulators, shutters, optical mixers, and sensors, owing to its ferroelectric and piezoelectric properties after poling treatment. There has recently been considerable interest in the properties of its role in osseointegration. In this study, we investigated the possibility of treating BTO by poling to improve osseointegration by examining the calcium phosphate (Ca-P) crystal growth behavior on the poled and non-poled BTO surfaces in simulated body fluids (SBF). The BTO samples were sintered at 1350℃ for 2 h in air, producing an average grain size of 7 ㎛, which were confirmed by SEM observation. The sintered BTO samples were then polarized (Ep=5 kV/cm) from 160℃ to 25℃ in a Si oil bath for 2 h. The poled and non-poled BTO samples were immersed in 1.5 SBF for 15 days, or 30 days at 37℃. After the immersion period, the morphological and compositional changes of the surface of the immersed BTO specimens were investigated using a field emission scanning electron microscope (FE-SEM) and an energy dispersive X-ray spectrometer (EDX). Qualitative analysis was then performed using fourier transform infrared (FTIR) analysis. Weak and coarse Ca-P crystals had grown on the surface of the non poled BTO, while a marked difference in the Ca-P forming pattern was visible for the poled BTO, showing the negatively charged surface induces a Ca-P layer more easily. We assumed that rapidly adsorbed cations (Ca2+ ions) on the negatively charged surface at the initial stage acted as nuclei for the formation of Ca-P crystals, while no nuclei would be available on the positively charged surface, due to the fact that sodium chloride (NaCl) crystals were formed owing to anion adsorption (Cl ions). In summary, these results demonstrate that poling the ferroelectric BTO surface negatively the possibility of implant osseointegration.

영․유아 그림 표상 특성에 관한 연구

이승옥,최은영,임지향 대구대학교 특수교육재활과학연구소 2005 再活科學硏究 Vol.23 No.2

The purpose of this study was to refer a symbolic characteristic of painting during scribbling period by applying a task condition, to present basic data about effective symbolic painting by analyzing a process of a construct activity, and to examine verification of effectiveness in the Korean infant. The one way anova is carried out to find out a symbolic characteristic of painting of Age(4)X group and the two way anova to Group(2)×Age(4), is conducted to figure out the difference of NC performance owing to task presented type upon age bracket. The followings were ostensive purposes of this study. First, there would be differences in symbolic characteristic by tasks and ages(the total score, the score of symbol inside the outline, the score of constituent, the score of pair symbolic). Second, the NC performance would differ in symbolic characteristic by age and painting type(the total score, the score of symbol inside the outline, the score of constituent, the score of pair symbolic). The study participants were randomly selected one - three years old infants (total of 80) who attend in an infant home in northern Daegu. They were divided in four groups. Each age group was presented two type of painting and multivariate analysis was taken in order to compare and analyze paintings. The result of this study was followed. First, the characteristic of painting symbol was different by task and age. The expressive ability in total score, constituent of object, pair symbolic in P task and DC task was increased as aging. Among the group of infants aged 1.5 - 2.5, P task was performed better than DC task, and the score of P task and DC task was equally heightened as they become age of 3. Second, NC performance owing to task presented type upon age bracket would be different (the total score, the score of symbol inside the outline, the score of constituent, the score of pair symbolic). The older has shown more expressive ability in two type of painting. NC task was taken after pre- P task and -DC task, but the symbolic score of NC task differed from. NC task followed by P task represented the more constituents and pair symbols than by DC task. Therefore, this study found out that the development of symbolic level in infant had close relationship with an age, the symbolic abilities in different painting tasks differed order of P task, DC task, and NC task, and symbolic painting was shown from infant age 1.5-2. 본 연구는 초기 그림 표상 출현과정을 살피기 위한 것으로 구체적인 가설은 다음과 같다. 첫째, 과제별 연령에 따른 그림 표상의 특성(총점수, 윤곽선 안의 표상의 점수, 대상의 구성요소 표상의 점수, 쌍표상의 점수)은 차이가 있을 것이다. 둘째, 연령별 과제 제시유형에 따른 NC과제 수행(총점수, 윤곽선 안의 표상의 점수, 대상의 구성요소 표상의 점수, 쌍표상의 점수)은 차이가 있을 것이다. 연구대상은 00시에 위치한 어린이집에 재원중인 1-3세 유아 총80명을 무선선정하여 연령별로 4집단을 나누고 각 연령집단별로 두 그룹으로 나누어 서로 다른 유형의 과제를 실시하였다. 즉 한 그룹은 P과제 이후 NC과제를 실시하였고, 다른 한 그룹은 DC과제 이후 NC과제를 실시하였다. 과제실시 이후 각 과제에서 얻어진 표상그림을 채점하였다. 자료처리는 과제별 연령에 따른 그림표상의 특성을 살펴보기 위해 연령(4)x집단간의 일원 다변량분석을 실시하였고, 연령별 과제 제시유형에 따른 NC과제 수행의 차이를 보기 위하여 집단(2)×연령(4)에 대하여 2원 다변량분석을 실시하였다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, 과제별 연령별에 따른 그림 표상의 특성은 차이가 있다. 연령에 따라 P과제 또는 DC과제 모두가 총점수, 대상의 구성요소, 쌍표상의 표현능력은 연령이 높음에 따라 표상능력이 증가함을 알 수 있었다. 1.5세-2.5세에서는 P과제가 DC과제보다 훨씬 잘 수행했으며 3세가 되면서 P과제와 DC과제 점수가 같이 높아졌다. 둘째, 연령별 과제 제시유형에 따른 NC과제 수행은 차이가 있다. 연령이 증가 할수록 과제 제시유형에서 과제의 표상 능력도 증가하였다. 연령에 따라 P과제 선행 후 NC과제와 DC과제 선행 후 NC과제의 표상의 점수는 다르다. P과제 선행 후 NC과제가 DC과제 선행 후 NC과제에서 보다 더 많은 대상의 구성요소, 쌍표상을 표현한 것으로 나타났다. 따라서, 본 연구를 통해 유아의 표상 수준의 발달은 연령과 밀접한 관계가 있고 과제에 따른 그리기 표상능력도 P과제, DC과제, NC과제 순으로 일어나며, 표상적 그리기가 1.5세와 2세경에 시작된다는 것을 보여준다.

Mg(OH)₂를 이용한 습식탈황에서 폐슬러리 처리특성연구

김근범,이은덕,박영성,임봉수 大田大學校 環境問題硏究所 1998 환경문제연구소 논문집 Vol.3 No.-

Properties analyses and treatment characteristics of waste slurry discharged in the wetted flue gas desulfurization process using Mg(OH)₂as a absorbent were investigated. Aeration and coagulation test were carried out to evaluate variation of some factors such as COD, SS, T-N, etc. related to waste slurry treatment. The hydraulic retention time(HRT) and coagulant dosage rate were applied as operating variables in experiment. As experimental results, the reduction effects of COD, SS in aeration test were distinct, due to oxidation of SO₃ and floc, formation of suspended solids. It was also found that the reduction efficiencies of SS and T-P in coagulation test are higher than 90%.

Therapeutic Effects of Chaenomeles sinensis (Thouin) Koehene Extracts on Mouse Models of Respiratory Disorders

Eun Yeong Lim,Dong-Uk Shin,Gun-Dong Kim,So-Young Lee,Hee Soon Shin 한국식품영양과학회 2022 한국식품영양과학회 학술대회발표집 Vol.2022 No.10

Identification of autoantibodies associated with systemic Lupus erythematosus by serological analysis of cDNA expression Library

( Eun Bong Lee ),( Doo Il Jeoung ),( Seong Eun Lee ),( Yoon Lim ),( Dae Yeon Lee ),( Jong Wan Kim ),( Hae Yeong Kim ),( Yeong Wook Song ) 대한내과학회 2002 대한내과학회 추계학술대회 Vol.63 No.-