대기업 직장인들의 여가제약요인에 관한 조사연구

성영호,강석명,허건식 龍仁大學校 體育科學硏究所 2003 體育科學硏究論叢 Vol.13 No.2

This study is aimed at understanding the constraints of leisure for 300 male and female employees in the service of a large enterprise, S, in Suwon city, Gyeonggi province, and it analyzes the constraints of leisure for them depending on variables. The collected questionnaires were analyzed by the means of SPSS/PC+ statistics program. A One Way-ANOVA was employed to uncover the constraints of leisure depending on each variable, after which Scheffe test was carried out. With these research methods and data analyses, the conclusions of this research on the leisure constraints of large enterprise employees are as follows. First, 'lack of time', one of the constraints of leisure, demonstrated a meaningful difference (p<.05) between male and female employees, as male employees seemed to be prevented from enjoying leisure activities by 'lack of time' more than their counterparts. Second, 'absence of a partner(s)' (p<.05) and financial cost (p<.0l) showed a meaningful difference among different age groups. Those aged between 50 and 59 seemed to suffer from 'absence of a partner(s)' more than any other factors in enjoying leisure, whereas 'lack of time', was a more important constraint for those aged between 30 and 39. Third, all the factors lack of time, facilities and programs, lack of motivation, laziness, absence of a partner(s), and financial cost - appeared to have no meaningful difference among employees with different duties. Fourth, 'lack of motivation' (p<.05), 'laziness' (p<.05), and 'financial cost' (p<.0l) showed a meaningful difference among employees with a diverse range of careers. Those with a career of over 26 years pointed out 'lack of motivation' and 'laziness' as the most crucial constraints of leisure, whereas 'financial cost' seemed to matter to the leisure of those with a career between 11 and 15 years more than any other constraints.

플레이트를 이용한 냉간성형 각형강관 T형 접합부에 관한 실험적 연구

석희원,박금성,정상민,조성식,배규웅,문태섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The purpose of this paper is to investigate experimentally the strength and deformation of T-joints to evaluate the structural behavior of truss connection consisted in square hollow steel section with plate. There are the branch plate type in T-joint shapes. Principal parameters are the ratio of the chord width to thickness(2ν=31.3, 22.2, 16.7) and the ratio of branch plate thickness to chord width(βp=0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.85). The most important result obtained from this experiment is as follows; The ultimate strength of T-joints increase proportionally as the 2ν ratio decrease, and the βp ratio increase. The others, experimental results are summarized for ultimate strength to displacement, initial stiffness and failure mode of each T-joints.

생물학적 자극 통제 수단으로 활용하기 위한 돼지 페로몬성 냄새 물질의 탐색 II : Ⅳ. 2-(Cyclohexyloxy)tetrahydrofurane 유도체와 Porcine Odorant Binding Protein 사이의 결합 친화력에 관한 비교분자 유사성 지수분석 (CoMSIA)

성낙도,박창식,장석찬,최경섭 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10

돼지 페르몬성 분자를 탐색하기 위하여 일련의 green odorant로서 기질 분자인 2-(cyclohexyloxy)tetrahydrofurane 유도체들의 정량적인 구조와 수용체인 porcine odorant binding protein (pOBP) 사이의 결합 친화력 상수(p(Od)_(50))에 대한 비교 분자 유사성 지수 분석(CoMSLA)을 실행하였다. 가장 양호한 CoMSLA 모델(I-AI)은 기질 분자내 입체 중심의 절대 배열이 I:C₁(R),C₂(S)인 분자를 atom based fit 정렬하였을 경우의 입체장 조건에서 유도되었으며 PLS 분석 결과, 예측성이 r²_(cv.)(q²)=0.856 그리고 적합성이 r²_(ncv.)=0.964이었다. 모델의 CoMSIA 등고도 상, pOBP와 냄새 분자 사이의 상호작용으로부터 가장 높은 결합 친화력을 나타내는 분자의 구조적 특징들을 이해할 수 있었다. To search of a new porcine pheromonal odorants, the comparative molecular similarity indices analysis (CoMSIA) between porcine odorant binding protein (pOBP) as receptor and ligands of green odorants 2-(cyclohexyloxy)tetra-hydrofurane derivatives as substrate molecule were conducted and disscused quantitatively. In the optimized. CoMSIA model (I-AI) with chirality (I: C₁(R), C₂(S)) in substrate molecules and atom based fit alignment (AF) of the odorants, the statistical PLS results showed the best predictability of the binding affinities based on the LOO cross-validated value r²_(cv.) (q²=0.856) and non cross-validated conventional coefficient (r²_(ncv.)= 0.964). The structural distinctions of the highest active molecules were able to understand from the interaction between poBP and green odorants in the contour maps with CoMSIA model.

Nortriptyline 청소율과 Metoprolol 산화대사능과의 상관관계

정원석,장인진,이경훈,신상구,우종인,박찬웅 大韓臨床藥理學會 1993 臨床藥理學會誌 Vol.1 No.2

수용성 키틴이 백서 창상치유에 미치는 영향

강장석,조용남,정상훈,유 결,임진수,권 호,조용우,고석원 大韓成形外科學會 2001 Archives of Plastic Surgery Vol.28 No.1

호알칼리성 Bacillus sp.F204와 Bacillus sp.K17의 원형질체 융합

성낙계,노종수,박석규,정영철 순천대학교 기초과학연구소 1990 基礎科學硏究誌 Vol.1 No.-

To develop cellulase and xylanase-producing strain by protoplast fusion, alkalophilic Bacillus sp. F204 and K17 were treated with NTG(N-methyl-N'-nitro-N-nitrosoguanidine) and isolated antibiotics resistant strains of S20 (Km', Cm') and G70(Str'). The frequency of protoplast formation was about 95% when cells of mid-log phase were treated with 200㎍/㎖ lysozyme at 37℃ for 30-45 minutes. Under addition of 0.4-0.5M sodium succinate, 0.5% casamino acid, 1.5% polyvinylpyrrolidone, 25mM MgCl_2 and 50mM CaCl_2 to the regeneration medium, the regeneration frequency of Bacillus sp. F204 and K17 was 24.9% and 26.2%, respectively. the fusion frequency was 6.6×10^-6 in the presence of 30% polyethylene glycol 6000 containing 50mM Ca^++ at 45℃ for 5 minutes. Cellulase complex and xylanase activities of fusant were compared with parental strains.

Effect of Strain Aging on Tensile Behavior and Properties of API X60, X70, and X80 Pipeline Steels

Sang‑In Lee,Seung‑Yong Lee,Seok Gyu Lee,Hwan Gyo Jung,Byoungchul Hwang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

The effect of strain aging on tensile behavior and properties of API X60, X70, and X80 pipeline steels was investigated inthis study. The API X60, X70, and X80 pipeline steels were fabricated by varying alloying elements and thermomechanicalprocessing conditions. Although all the steels exhibited complex microstructure consisting of polygonal ferrite (PF), acicularferrite, granular bainite (GB), bainitic ferrite (BF), and secondary phases, they had different fractions of microstructuresdepending on the alloying elements and thermomechanical processing conditions. The tensile test results revealed that yieldingbehavior steadily changed from continuous-type to discontinuous-type as aging temperature increases after 1% pre-strain. After pre-strain and thermal aging treatment in all the steels, the yield and tensile strengths, and yield ratio were increased,while the uniform elongation and work hardening exponent were decreased. In the case of the X80 steel, particularly, thedecrease in uniform elongation was relatively small due to many mobile dislocations in PF, and the increase in yield ratiowas the lowest because a large amount of harder microstructures such as GB, BF, and coarse secondary phases effectivelyenhanced work hardening.

한우 성별에 따른 등심의 육질특성 비교

최정석, 정동순, 최석현, 이상화, 김종희, 최양일 忠北大學校 農業科學硏究所 2011 農業科學硏究 Vol.27 No.4

-본문참고-

절충형 피복재배방법에서 배토 시기가 연초 식물의 생육에 미치는 영향

박상현,석영선 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This study was conducted to investigate the effect of molding time on the early growth of tobacco plant. The results were summarized as follows. In molding treatment, plant height, stem diameter, largest leaf area, and adventitious root were larger twice than once. In molding time treatments, the growing characters of tobacco in compromised mulching were better early than late but those in pit-covered mulching were not different. At interaction of molding time and time, the early growth of tobacco plant was better early and twice molding treatments than late and once molding treatments.

TiO₂ 졸-겔 코팅 막에 의한 Humic Acid의 광분해 : 화학적 산화법에 의한 부식산의 분해처리 기술에 관한 연구(Ⅱ);Characterization of Humic Acid in the Chemical Oxidation Treatment (Ⅱ)

석상일,안복엽,서태수,이동석 江原大學校 附設 環境硏究所 2000 環境硏究 Vol.17 No.-

The degradation of humic acid using TiO₂ coatings studied. TiO₂ coatings were prepared by dip-coating method. Sol solutions for coating were prepared by mixing the gel, which can be produced by the reaction of TiOCl₂ and NH₁OH solution, and hydrogen peroxide solution, and hydrolysis of titanium tetraisopropoxide (TTIP). It was shown from SRD that coatings from sol aged at 100℃ for 18h with titanium peroxo solution were crystallized to anatase in the range of temperatures of 25℃ to 500℃. In contrast, those coated from TTIP were crystallized to anatase at temperature above 400℃. So the sols originated from TiCl₄ can be applied for not only on the heat-resistance substrates but on the plastic substrates. Thickness and the quality of the films were dependent on the withdrawing speed, the concentration of sol, and the number of coating. The films showed various interference colors depending on the thickness of them. In the case that the films coated 2 times at withdrawing speed of 2.5cm per minute by 0.2M sol, the films had a transparent light blue color with thickness of around 50nm. It was known from the result of photo-degradation by TiO₂ coatings using humic acid that the removal efficiency of COD_(cr) was over 85% after illumination of UV/H₂O₂ for 40min, and that of UV/VIS absorbable materials was over 95%. TiO₂코팅매체를 이용한 humid acid의 광분해 특성을 조사하였다. TiO₂코팅은 TiOCl₂ 수용액을 암모니아수로 침전시킨 겔을 과산화수소로 용해한 용액 혹은 졸이나 titanium tetraisopropoxide (TTIP)의 가수분해로부터 제조한 졸을 이용하여 dip-coating법으로 제조하였다. Titanium peroxo 용액을 열처리하여 제조한 졸을 이용한 코팅층은 X-선 회절 분석으로부터 25℃~500℃ 온도 범위에서 모두 anatase형 결정구조를 가지고 있었다. 반면에 TTIP의 가수분해로 생성된 졸로부터 만든 코팅막은 400℃ 이상에서 anatase의 결정형이 나타났다. 이로부터 titanium peroxo 용액을 열처리하여 제조한 졸은 내열성 및 비내열성 기판에도 결정성 TiO₂ 코팅층을 만들 수 있는 장점이 있다. 코팅막의 두께 및 균일성은 인출속도, 코팅졸의 농도 및 코팅 횟수에 영향을 받았으며, 코팅막의 두께에 따라 다양한 간접색상을 나타냈다. 0.2M 졸을 이용하여 인출속도 2.2cm/min로 2회 코팅했을 경우, 약 50nm 두께의 투명하면서도 균일한 흐린 남색을 띠는 TiO₂코팅막을 얻을 수 있었다. 이상의 방법으로 직경 0.3cm의 유리구슬에 TiO₂ 코팅막을 제조한 후 580cm³의 반응조를 사용하여 UV/H₂O₂ 공정으로 humic acid를 40분 동안 광반응시킨 결과, 초기 시료의 COD_(cr)(40ppm)을 약 85% 이상, 흡광물질을 약 95% 이상 제거하였다.