20대 연령의 안정성 한계(Limits of Stability)에 대한 연구

권오윤,장정훈 원광보건전문대 1995 원광보건전문대학논문집 Vol.18 No.-

테이핑이 발목의 관절가동범위와 고유수용성감각에 미치는 영향

김창인,권오윤,이충휘 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.3

This study was designed to determine the effect of ankle taping and short period of walking on the treadmill on the range of motion (ROM) and proprioception at the ankle joint. Twenty healthy male subjects (mean age=24.2 yr) participated in this study. Goniometry and videotape replaying method were used to measure the ankle ROM. Passive sagittal and frontal plane motions were measured. The difference in degree between the stimulus point and the reproduced point was defined as an angular error. The measurements were performed at four different phases: pre-taping (PRT), post-taping immediately (POT), post-5 minute walking with taping (P5M), and post-10 minute walking with taping (P10M). The ankle of dominant limb was taped by a certified athletic trainer using a closed basket weave technique. Participants walked on the treadmill at 2.5 mph. The results showed that the mean of the sagittal plane motion at PRT, POT, P5M, and P10M was 53.0, 30.5, 36.2, and 40.2 degrees, respectively. The frontal plane motion at PRT, POT, P5M, and P10M was 33.6, 13.9, 15.7, and 18.6 degrees, respectively, The angular error at PRT, POT, P5M, and P10M was 5.5, 1.6, 1.8, and 1.9 degrees, respectively. After 10 minutes of walking, the sagittal plane motion and frontal plane motion was increased by 9.7 and 4.7 degrees compared with POT, respectively. The proprioception was significantly improved alter the application of ankle taping. Both the restriction of frontal plane motion and proprioception improvement at the ankle joint may contribute to ankle stability during walking.

슬링(sling)과 고정된 지지면에서의 팔굽혀펴기 동작 시 근 활성도 비교

오재섭,박준상,김선엽,권오윤 한국전문물리치료학회 2003 한국전문물리치료학회지 Vol.10 No.3

連翹敗毒散加味方이 알러지성 접촉피비염에 미치는 影響 : DNCB 재노출부위의 생쥐 피부손상완화와 비만세포 분포 변화를 중심으로 Based on the mitigation of skin damage and distributive change of mast cell on DNCB re-expasure region of Mice

권오성,김진택,박인식,안상현,이해풍,김호현,강윤호 동국대학교 한의학연구소 1999 東國韓醫學硏究所論文集 Vol.8 No.1

본 실험은 連翹敗毒散加味方이 알러지성 접촉피부염 유발시 발생되는 면역과민반응과 염증반응 저해에 미치는 영향을 조사하기위해 행해진 것으로 2,4-dinitrochlorobenzene(DNCB, 5% DNCB 25㎕로 감작, 7일경과 후 2.5% DNCB 5㎕로 유발) 처리로 알러지성 접촉피부염이 유발된 ICR계 암컷 생쥐에 連翹敗毒散加味方抽出物(0.51g/㎏/day)을 음용투여 한 다음 contact hypersensitivity assay, 피부의 일반적인 구조 그리고 비만세포의 분포 변화를 관찰하였다. Contact hypersensitivity assay의 결과, 連翹敗毒散加味方抽出物 투여군의 ear swelling이 DNCB군에 비해 유의성있게 감소한 것으로 나타났다. 알러지성 접촉피부염 유발 후 관찰되는 피부손상은 48시간에 제일 심한 것으로 관찰되었으나, 連翹敗毒散加味方抽出物 투여군에서는 DNCB군 비해 완화된 결과를 보였다. 連翹敗毒散加味方抽出物 투여군의 진피에서 림프구를 비롯한 염증관여세포의 이주와 혈관생성 그리고 표피내로의 림프구의 침윤 등이 감소되었고, 표피 기저층과 가시층세포에서는 세포질내 액포화와 세포사이 공간 확장도 줄어든 것으로 관찰되었다. 한편 알러지성 접촉피부염 유발 후 분포가 증가한 비만세포는 형태가 주로 세포내 함유물이 분비된 degranulated type로 나타났다. 이에 반해 連翹敗毒散加味方抽出物 투여군는 DNCB군에 비해 출현 비만세포'수가 일부 감소했고, 비만세포의 형태는 granulated t-ype였다. 또한 serotonin 면역조직화학적 염색결과로 連翹敗毒散加味方抽出物 투여군에서 se-rotonin 양성반응성이 높은 granulated type의 비만 세포가 주로 관찰되었다. 이상의 결과로 미루어 連翹敗毒散加味方抽出物은 알러지성 접촉피부염으로 유발된 피부 손상과 염증을 완화시키는 효과가 있는 것으로 사료된다. After allergic contact dermatitis elicitated by Dinitrochlorobenzene(DNCB) treatment, ICR female mice administered Yunkyopaedocksangamibang(YPGM) extract were observed to investigate the effect of YPGM on allergic contact dermatitis. This study investigated that contact hypersensitivity assay, abdominal skin morphologic changes including mast cells. At contact hypersensitivity assay, the right ear swelling in YPGM group were probability decrease than DNCB group. At obsevation of abdominal skin morphologic change, the infilteration of lymhocyte, lymphocyte insertion to epithelium, enlarged capillary, angiogenesis, and damages of epithelium as cytoplasmic vacuolation and enlarge of inter cellular space in YPGM were diminshed than DNCB group. The number of mast cell was increased both DNCB and YPGM group. The shape of mast cell in DNCB group was mainly appeared degranulated type, but granulated type in YPGM group. The number of serotonin positive cell was increased both DNCB and YPGM group. The shape of serotonin positive cell in DNCB group was mainly appeared degranuled type, but granulated type in YPGM group. As results indicated that the YPGM exrtact administration work on the mitigation of skin damages in mouse with allergic contact dermatitis.

n-Hexane에서 Aniline, N,N-dimethylaniline, Pyridine과 Iodine간의 Complex 형성에 따른 열역학적 성질에 대한 연구

권오윤,김응렬 漢陽大學校 基礎科學硏究所 1988 基礎科學論文集 Vol.7 No.-

n-Hexane 중에서 aniline, N,N-dimethylaniline, pyridine과 iodine간의 charge transfer complex 형성에 따른 열역학적 성질을 constant activity method를 이용해서 조사하였다. 용액중 iodine, activity를 일정하게 유지하기 위하여 tetramethyl ammonium pentaiodide를 사용하였으며, 이들 complex에 대한 isosbestic point를 분광학적인 방법으로 측정한 결과 aniline, N,N-dimethylaniline 및 pyridine에 대하여 각각 495, 513.5, 478nm 이었다. 25℃에서 aniline, N,N-dimethylaniline 및 pyriod과 iodine각의 complex 형성에 대한 평형상수는 각각 3.1, 30.86, 118.91·??이었으며, 속도 상수는 ??,??,??로 나타났다. 그리고 열역학적 parameter, ΔG는 -0.672, -2.030, ?? 이며, ΔS는 각각 -24.7, -34.3, ??, ΔH는 8.02, 12.26, ??이었다. The thermodynamic properties of iodine complexes with aniline, N,N-dimethy laniline, pyridine in n-hexane were studied by constant activity method. To maintain constant iodine activity in solution, we made use of ??(tetramethylammonium-pentaiodide) Isosbestic points measured by spectroscopic method were aniline:495nm, N,N-dimethylaniline:513.5nm, pyridine:478nm, respectively. Spectroscopic measurement was done at these iosbestic spoint, and experimental results for each iodine complexes with aniline, N,N-dimethylaniline, pyridine are following; equilibrium constant:3.11, 30.86, ??, rate constant :??, ??, ??, and thermodynamic parameters, ΔG:-0.672, -2.030, ??, ΔS:-24.7, 34.3, ??, and ΔH:8.02, 12.26, ??.

전하이동 착물형성에 따른 Mechanism 및 용매의 영향

權五윤,崔相元,徐鎬埈 여수대학교 1989 論文集 Vol.3 No.-

The formation of charge transfer complex between iodine and aniline in CHCl₃CHCl₄: CH₂Cl₂(1:1), CH₂Cl₂have been studied kinetically by using conductivity method. The initially formed outer charge transfer complex was transformed into a inner charge transfer complex. The pseudo first order rate constants and activation entropy are affected by solvent dielectric constant. The second order rate constants for the decomposition of the outer charge tranfer complex (first order in aniline and in the outer charge transfer complex) depend on the aniline concentration. The ease with which the transfermation proceeds depends on the relative magnitudes of the enthalpy of formation of the outer charge transfer complex as well as aniline concentration.

평직구조 CFRP 적층판 복합재의 강도 및 균열진전특성에 대한 AE 평가

윤유성,권오헌 한국안전학회 2004 한국안전학회지 Vol.19 No.1

The mechanical strength and crack propagation of plain woven carbon fiber fabric laminate composites are examined by acoustic emission(AE). AE signals are measured during the tensile test and fracture tests. Thus, the relationship between AE signal and load-displacement curves and crack extension length are shown. Also the fracture mechanisms in terms of AE characteristics are discussed in viewpoint of crack propagation behavior.

Chloroform 용매 중에서 Aniline과 Iodine간의 Charge Transfer Complex 형성 Mechanism에 대한 연구

권오윤,崔相元,金南政 여수대학교 1989 論文集 Vol.3 No.-

The formation of charge transfer complex between indine and aniline in chloroform solvent have been studied kinetically by using conductivity method. The initially formed outer charge transfer complex was transformed into a inner charge transfer complex. The pseudo first order rate constants and aitivation entropy are affected by aniline concentration. The second order rate constants for the decomposition of the outer charge transfer complex(first order in aniline and in the outer charge transfer complex) depend on the aniline concentration. The ease with which the transformation proceeds depends on the relative magnitudes of the enthalpy of formation of the outer charge transfer complex as well as dielectric properties of aniline.

600합금의 미세조직 변화 및 SCC거동에 미치는 Ce 첨가의 영향

권오철,이용선,임연수,정만교,김정수 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.1

High purity model alloys with major composition Ni-15Cr-9Fe-0.03C (600CEO) and Ni-15Cr-9Fe-0.03C-0.04Ce (600CE4) were produced. Using these model alloys the effect of alloying element Ce on the SCC behavior of Alloy 600 was evaluated in a caustic solution. To obtain carbides precipitated on grain boundaries, the thermal treatment was performed on both the solution annealed model alloys. Microstructural examinations using SEM and TEM EDX showed that the same structural carbides, Cr_(7)Cc₃, were precipitated on both the alloys and no significant difference in the amount of Cr depletion along grain boundaries was observed between the two model alloys. However, it was shown that the coverage of grain boundary carbides was higher in the Ce-bearing alloy (600CE4). The SCC susceptibility of the alloys was investigated in 40%NaOH solution at 315℃. Being evaluated in terms of the maximum crack depth, the SCC susceptibility of the alloy turned out to be reduced by the addition of Ce. The increased resistance to the SCC in the alloy 600CE4 was considered to be attributable to the increased coverage of grain boundary carbides. (Received September 30, 2004)

Ethanol중에서 Dodecylamine 의 Layered Silicate 층내 삽입 거동

권오윤 여수대학교 1998 論文集 Vol.13 No.2

Intercalation behaviors of dodecylamine into interlayer of layered silicic acids such as H+-magadiite, H+-kenyaite and H+-montmorilonite were investigated by X-ray powder diffraction method in ehanol solution. Well-crystallized dodecylamine-H+-montmorilonite intercalation compounds formed in 0.5M∼1.2M dodecylamine solution, but basal spacings showed a great increase from 26Å to 41.4Å between 0.9M and 1.2M dodecylamine solution. Dodecylamine-H+-magadiite intercalation compounds crystallized well with basal spacing of 48.0Å in 1.5M dodecylamine solution. Dodecylamine-H+-kenyaite intercalation compounds formed well with basal spacing of 52.8Å. These results indicate that an arrangement and adsorption amount of dodecylamine in intersurface have an affect on the increase of basal spacing.