프로골프선수의 슬관절 등속성 근력에 관한 굴곡근과 신전근의 비교연구

박성태,정성태,정덕조,정영수,엄우섭,전태원,우재홍,박익렬 한국운동과학회 2000 운동과학 Vol.9 No.1

프로골프선수의 슬관절 등속성 근력에 관한 굴곡근과 신전근의 비교연구. 운동과학, 제 9권 제 1호. (201)-(209), 2000. 본 연구는 장기간의 골프운동이 슬관절의 단축성 굴근력과 신근력의 발달에 미치는 영향을 규명하여 경기력 향상을 위한 트레이닝 방법의 기초자료를 제공하고자 수행 되었다. 연구의 대상은 24명의 프로골프선수들(29.60±3.8세)로 골프경력은 12±1.7년으로 대상자 전원이 오른손을 주로 사용(우타)하였다. 측정은 등속성근력계(Cybex 770)를 이용하여 각속도 60°/sec와 180°/sec에서 3회씩 좌·우 교대로 측정하였다. 측정변인은 peak torque, peak torque 발현각, 평균파워, 총운동량 등이었다. 자료분석은 SPSS통계프로그램을 이용하여 실시하였으며 다음과 같은 결론을 얻었다.; 슬관절 굴곡근과 신장근의 좌·우 근력 비교에서 각속도 180°/sec로 굴곡성 운동시 총 운동량(total work)에서 좌·우측간에 유의한 차이가 있는 것으로 나타났으나(p<.05), 나머지 측정변인에서는 굴곡근과 신전근 모두 부하각속도에서 통계적으로 유의하지 않았다. 굴곡력의 경우 우측하지가 좌측하지에 비하여 높았으나 신전력의 경우 좌측하지가 다소 높은 경향을 보였다. 각 변인의 평균치에 대한 60°/sec와 180°/sec간의 비교에서는 모든 변인에서 통계적으로 유의한 차이를 나타내었다(p<.05). 슬관절 굴곡근의 신전근에 대한 비율(Flexor/Extensor Ratio)은 60°/sec에서 60%보다 낮게 나타났으나 좌·우측간 유의하지는 않았다. 결론적으로 다년간의 골프운동은 하지의 슬관절 근기능을 발달시키며 우측하지에 비해 좌측하지의 신전근에 더 많은 발달을 가져온다고 할 수 있다. A study on isokinetic concentric torque of kee extensor and flexor in golf players. Exercise Science, 9(1): 201-209, 2000. The purpose of this stydy was to investigate the effect of long therm golf exercise on isokinetic concentric torque of kee extensor and flexor. The subjects of this study were 24 men progolf players(29.60±3.8yrs) who have experience of 12±1.7yrs golf exercise and use mainly a right hand. The measurement was performed by use of Cybex 770 in angular velocity 60˚ /sec, 180˚ /sec and 3 repetitions. The variable of measure were peak torque, angle of peak torque, average power, total work and so on. The result of this study were as follow: There only was statistical difference between both low limb in Total work of knee flexor in angular velocity 180°/sec(p<.05) but not in other variables in both angular valocity. Right low limb was little stronger than reft low limb in flexor but there was opposite result in extensors. There was statistical difference between 60°/sec and 180°/sec in all varible. Knee flexors and extensors ratio was lower than 60% in angular velocity 60°/sec but there was no statistical difference between right and left low limb. It might be concluded from the test that long term golf exercise strengthen muscle function of knee flexors and extensor and left knee extensors more strengthen than right knee extensors.

최대운동시 항산화제 투여와 운동처지가 대사 및 근피로도에 미치는 영향

정성태,정덕조,전태원,최명동,이왕록 한국운동과학회 2000 운동과학 Vol.9 No.1

최대운동시 항산화제 투여와 운동처치가 대사 및 근피로도에 미치는 영향. 운동과학, 제 9권 제 1호. (137)-(148), 2000. 본 연구는 6주간의 항산화제 투여와 운동처치가 대사반응 및 하지근육의 근 피로도에 미치는 영향을 규명하는 것이었다. 본 연구의 목적을 달성하기 위하여 중학교 학생 27명을 대상으로 6주간의 항산화제 투여(비타민 E+C, 위약)와 운동처치(처치집단, 통제집단)를 실시하였다. 이상의 연구 절차를 통해 얻은 연구결과는 다음과 같다. 첫째, 6주간의 항산화제 투여(비타민 E+C, 위약)와 운동처치(처치집단, 통제집단)를 실시한 후, 각 집단간 운동지속시간을 비교한 결과는 항산화제를 투여한 집단에서 위약을 투여한 집단에 비해서 통계적으로 유의한 차이를 나타내었다(P<0.05). 둘째, 6주간의 합산화제 투여(비타민 E+C, 위약)와 운동처치(처치집단, 통제집단)를 실시한 후, 각 집단간 최대산소섭취량을 비교한 결과는 항산화제를 투여한 집단에서 위약을 투여한 집단에 비해서 통계적으로 유의한 차이를 나타내었다(P<0.05). 세째, 6주간의 항산화제투여(비타민 E+C, 위약)와 운동처치(처치집단, 통제집단)를 실시한 후, 각 집단간 근피로도(평균파워주파수)을 비교하였다. 각 집단간 평균파워주파수는 통계적으로 유의한 차이는 없었다. 이상의 결론을 종합해보면, 항산화 비타민 복합섭취는 운동수행력에 있어서 약간의 효과가 있는 것으로 나타났으나, 좀 더 정확한 결론을 내리기 위해서는 세포수준에서의 세일한 측정과 연구가 더 필요할 것이라고 제안한다.

C-Mn-Si 계 변태유기소성강의 성형상에 미치는 베이나이트 변태 온도 및 응력상태의 영향

박찬경,전현조,오진후,홍승갑 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.9

The effects of TRansformation Induced Plasticity(TRIP) phenomena on the plastic deformation of 0.2C-1.5Si-1.5Mn multiphase steel have been investigated at various heat treatment and stress conditions. In order to estimate a deformation behavior under multi-axial stress rotate, the hole expansion(HE) tests were carried out. It is shown that the formability evaluation from the uni-axial tensile tests was quite different from the formability measured from multi-axial HE-tests because of different stress state. The formability in the multi-axial stress state decreased due to the extinction of the transformable retained austenite at relatively earlier deformation stage and the production of irregular α' martensite. The voids of TRIP steel were initiated exactly at the interface between transformed martensite and ferrite matrix regardless of stress state. In addition, new form of experimental formula is proposed in order to predict the multi-axial formability of the TRIP steel from the results of uniaxial tensile test.

Fe-Mn 합금의 방진특성 및 변태특성에 미치는 냉간가공의 영향

최종술,백승한,지광구,신명철,전선우 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7

The objective of this study is to investigate the effect of deformation degree on damping capacity, transformation behavior and mechanical property in Fe-16%Mn-2%Cr and Fe-22%Mn alloys. The Fe-16%Mn2%Cr and Fe-22%Mn alloys undergo γ→ε→α' and γ→ε martensitic transformation by deformation, respectively. In the two alloys, the increase in degree of cold rolling cause an increase of reverse transformation temperatures of ε→γ because the dislocations introduced by cold rolling hinder the movement of γ→ε boundaries. The decrease in mobility of γ→ε boundary is responsible for a rise in driving force, raising the reverse transformation temperature. At low strain amplitudes of 1×10^(-4)∼4×10^(-4), damping capacity increases with increasing rolling degree up to 5-10%. At a high strain amplitude, the 0% rolled alloy exhibits good damping property. The results indicate that area of γ→εboundaries at a low strain amplitude is more dominant than their mobility. With a higher strain amplitude, however, mobility becomes a major factor for damping capacity.

원호형 문비(Tainter Gate) 의 동적 거동 해석

이성행,정경섭,우상익,전제상 충북대학교 건설기술연구소 1996 建設技術論文集 Vol.15 No.1

A fluid analysis and transient dynamic analysis were performed for tainter gate to find out a proper bottom geometries of gate and to investigate the dynamic behaviors. Firstly, natural frequencies were analyzed to examine the dynamic characteristics of fainter gate, then natural frequencies and mode shapes were displayed in each mode. Secondly, the distribution of pressure and velocity were analyzed, and these results were loaded at the boundary of fainter gate to implement the transient dynamic analysis of the flow at the boundary of bottom geometries of gate with $quot;A$quot; and $quot;B$quot; type models which were tested at previous study. In this paper, the dynamic behaviors of fainter gate were discussed, and the bottom geometries of gate to reduce the amplitudes of vibration were proposed.

변단면(變斷面) Beam-Column 에 대한 축하중(軸荷重)과 Moment 의 상관관계

유철수,전홍건 고려대학교 공학기술연구소 1985 고려대학교 생산기술연구소 생기연논문집 Vol.21 No.1

The analytical method finding interaction relationship among axial load, moment, and slenderness for tapered beam-column is quite complicated. Moreover, analysis for some shapes of cross-section is impossible. Newmark's integration method can be used as numerical analysis which is applicable for any shape factors. Using Newmark's method Interaction relationships between axial load and moment for simply supported case were obtained and represented by figures.

Fe3Al 금속간화합물의 항복강도 이상거동과 변형기구 고찰

박찬경,장영원,전현조 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.8

It is well known that Fe₃Al intermetallic compound shows an anomalous peak of the yield strength at about 500℃. That is, the yield strengths increase with increasing deformation temperature in the range of 300℃-500$quot;℃, and then decrease at higher temperatures. The dislocation structure was examined by transmission electron microscopy, and high temperature mechanical properties were examined by tensile and load relaxation tests. The flow stress curves obtained from lead relaxation bests were then analyzed in terms of internal variable deformation theory. It was found that the flow curves consisted of three micro-deformation mechanisms i.e inelastic deformation mode, plastic deformation mode and dislocation creep deformation mode, depending on both dislocation structure and deformation temperature. The flow curves could be well described by the constitutive equations of these three micro-deformation mechanisms based on the internal variable deformation theory.

Arc-Magnetron 복합 코팅 공정에 의한 (TiAl)N 박막 합성에 관한 연구

한전건,윤주선,한준희 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.3

(TiAl)N films deposited by cathodic arc process employing two separate targets of Al and Ti have lots of macro-particles on the surface. The macro-particles were found out to be generated mainly from Al cathode of low melting temperature. In the previous study, TiN films deposited with external magnetic field showed remarkable reduction of surface droplet. For the (TiAl)N coatings, however, the efficiency of Al droplet removal was not so much as TiN films. A new coating concept combining magnetron sputtering and arc evaporation for improved coating properties was made in this study. (TiAl)N and Al-gradient (TiAl)N coatings were deposited by arc-magnetron hybrid process and content of Al in the films was changed by power density of Al magnetron sputtering source. This hybrid process allowed compositionally gradient (TiAl)N coatings to be deposited with low macro-particles and excellent adhesion. It is noted that Al-gradient (TiAl)N coating showed micro hardness of 3,000 ㎏/㎟ and good adhesion of HF2 grade. The present study introduces the hybrid process parameters involved. The formation behavior of (TiAl)N and Al-gradient (TiAl)N coatings were investigated by SEM, EDX AES and XRD.

췌장암에서 Cyclooxygenase - 2 발현의 역할

김은경,이용욱,이규택,최규완,박동일,백승운,이준행,이종균,고광철,이풍렬,이종철,김재준,김완선,공구 대한소화기학회 2001 대한소화기학회지 Vol.38 No.3

Background/Aims: Accumulating evidence suggests that the use of NSAID may reduce the incidence of colorectal cancer. The likely mechanisms of these effects by NSAID is cyclooxygenase-2 (COX-2)-related inhibition of tumor proliferation and induction of apoptosis. The aim of our study was to examine possible roles and clinical significance of COX-2 expression in pancreatic cancer. Methods: Seventy-two pancreatic adenocarcinoma tissue specimens were obtained from surgical resection. After the immunohistochemical staining of the specimens, we examined proliferation activity (assayed by Ki-67 expression), apoptosis (by TUNEL stain), and microvessel density (by CD34 expression). We also investigated the relationship between the immunohistochemical expression of COX-2 and various clinicopathological characteristics. Results: The COX-2 positive rate in pancreatic epithelial cells was 41.7%. Proliferation index (PI) was significant higher in COX-2 positive specimens comparing to negative specimen (p=0.015) and the increase in intensity of COX-2 expression correlated with increasing PI (p=0.036). Apoptotic index (AI) was significantly higher in positivee COX-2 expression than in negative expression (p=0.044), but there was no significant difference in AI/PI between the COX-2 positive and negative specimens (p=0.44). The expression of COX-2 protein did not correlate with microvessel density, sex, age, differentiation, tumor size, stage, metastasis or patients survival. Conclusions: The expression of COX-2 enzyme in pancreatic cancer contributes to tumor proliferation, but is not related to apoptosis, angiogenesis or clinical characteristics. Further study is needed to examine the clinical usefulness of NSAID and COX-2 selective inhibitors.

마이크로파 가열에 의한 고구마의 가공 특성

금준석,한억,-- 한국조리과학회 1994 한국식품조리과학회지 Vol.10 No.2

Whole, peeled sweetpotatoes were subjected to four different processes: 15 min microwave heating followed by 15 min baking (1), 90 min baking (2), 15 min microwave heating (3), and 15 min boiling followed by 15 min microwave heating (4). Samples of green and cured roots were used in the study. Scanning electron photomicrographs revealed that cured roots contained larger numbers of starch granules in the parenchyma cells than green roots, most of them compounded. The starch in cooked green roots was gelatinized while for cured roots it was mostly hydrolyzed into dextrins and sugars. Starch in process (3) roots was mostly gelatinized while in process (1) and process (2) roots gelatinized starch appeared in little quantity, thus it was primarily converted to dextrins and sugars. The process (4) resulted in little conversion of starch. The process (1) product resulted in a similar product to the process (2) product.