회사정리법상의 실권(失權)과 민소법 제201조 제2항의 원상회복의무와의 관계(1)

채원식 한국사법행정학회 1982 사법행정 Vol.23 No.6

The Effect of Exercise Intensity on Muscle Activity and Kinematic Variables of the Lower Extremity during Squat

채원식,정재후 한국운동역학회 2017 한국운동역학회지 Vol.27 No.3

Objective: The purpose of this study was to determine how exercise intensity affects muscle activity and kinematic variables during squat. Method: Fifteen trainers with >5 years of experience were recruited. For the electromyography (EMG) measurements, four surface electrodes were attached to both sides of the lower extremity to monitor the rectus femoris (RF) and biceps femoris. Three digital camcorders were used to obtain three-dimensional kinematics of the body. Each subject performed a squat in different conditions (40% one-repetition maximum [40%1RM], 60%1RM, and 80%1RM). For each trial being analyzed, three critical instants and two phases were identified from the video recording. For each dependent variable, one-way analysis of variance with repeated measures was used to determine whether there were significant differences among the three different conditions (p<.05). When a significant difference was found, post hoc analyses were performed using the contrast procedure. Results: The results showed that the average integrated EMG values of the RF were significantly greater in 80%1RM than in 40%1RM during the extension phase. The temporal parameter was significantly longer in 80%1RM than in 40%1RM and 60%1RM during the extension phase. The joint angle of the knee was significantly greater in 80%1RM than in 40%1RM at flexion. The range of motion of the knee was significantly less in 80%1RM than in 40%1RM and 60%1RM during the flexion phase and the extension phase. The angular velocity was significantly less in 80%1RM than in 40%1RM and 60%1RM during the extension phase. Conclusion: Generally, the increase of muscle strength decreases the pace of motion based on the relation between the strength and speed of muscle. In this study, we also found that the increase of exercise intensity may contribute to the increase of the muscle activity of the RF and the running time in the extension phase during squat motion. We observed that increased exercise intensity may hinder the regulation of the range of motion and joint angle. It is suitable to perform consistent movements while controlling the proper range of motion to maximize the benefit of resistance training.

형사절차상 자백과정의 고찰 - 정읍공장장 1가족몰살사건을 중심으로 -

채원식 한국사법행정학회 1978 사법행정 Vol.19 No.8

충격력 제어를 통한 운동부상 예방 전략

채원식 대한운동사협회 2011 대한운동사협회 운동사대회자료집 Vol.2011 No.-

Bimodal Porous Gold Opals for Molecular Sensing

채원식,유현웅,Sung-Kyoung Ham,Myung-Jin Lee,Jin-Seung Jung,David B. Robinson 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6

We have fabricated bimodal porous gold skeletons by double-templating routes using poly(styrene) colloidal opals as templates. The fabricated gold skeletons show a bimodal pore-size distribution, with small pores within spheres and large pores between spheres. The templated bimodal porous gold skeletons were applied in Raman scattering experiments to study sensing efficiency for probe molecules. We found that the bimodal porous gold skeletons showed obvious enhancement of Raman scattering signals versus that of the unimodal porous gold which only has interstitial pores of several hundred nanometers.

전방십자인대 수술이 시행되어진 슬관절과 정상 슬관절의 유효 모멘트암(effective moment arm) 비교 분석

채원식 한국운동역학회 2003 한국운동역학회지 Vol.13 No.1

Chae, W-S. Bilateral Comparison of Effective Moment Arms of the Quadriceps Force on Unilateral ACL-Reconstructed Individuals. Korean Journal of Sport Biomechanics, Vol. 13, No. 1, pp. 13-21. The purpose of this study is ⒜ to estimate effective moment arms of quadriceps forces and ⒝ to compare the d_e between the ACL-reconstructed and uninjured knees the same individual. One female (20 yrs old, 2 yrs post-op, hamstring tendon autograft) and two males (22 yrs old, 2 yrs post-op; 28 yrs old, 4 yrs post-op; patellar tendon autografts for both). Sagittal view radiographs were obtained for 6-7 different angles (range 5˚-110˚) from each knee. The d_e was determined by the method of Chow et al.(1999a). The results showed that the maximum d_e values ranged from 4.61 to 5.59 cm and 4.59 to 4.89 cm for the ACL-reconstructed and uninjured knees, respectively. The maximum d_e occurred between 35˚ and 50˚ and 20˚ and 50˚ for the ACL-reconstructed and uninjured knees, respectively. The maximum d_e values ranged from 4.12 to 4.35 cm and 3.12 to 3.63 cm for the ACl-reconstructed and uninjured knees, respectively. The effective moment arm of the knee extensor affects the loads on knee ligaments during knee-extension exercises. Because apparent differences in the moment arm of the quadriceps in different participants, it is very important to use personalized knee joint geometry for the computation of knee joint force. In the present study, no noticeable bilateral difference was found in the male subjects. However, apparent bilateral differences in d_e were observed in the female subject. This suggests that the effects of ACL reconstruction surgery on patellar mechanism deserve further investigation.

Fabrication of 50 to 1000 nm Monodisperse ZnS Colloids

채원식,Ryan J. Kershner,Paul V. Braun 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.1

Monodisperse ZnS colloidal particles with precisely specified diameters over a broad size range were synthesized by controlled aggregation. Sub-10nm ZnS seed crystals were first nucleated at ambient temperature and then grown at an elevated temperature, which produced large polydisperse colloidal particles. Subsequent rapid thermal quenching and heating processes induced a number of secondary nucleations in addition to growing the large polydisperse microparticles which were finally removed by centrifugation and discarded at the completion of the reaction. The secondary nuclei were then aggregated further at elevated temperatures, resulting in colloidal particles which exhibited a nearly monodisperse size distribution. Particle diameters were controlled over a wide size range from 50 nm to 1 μm. Mie simulations of the experiment extinction spectra determined that the volume fraction of the ZnS is 0.66 in an aggregated colloidal particle and the colloidal particle effective refractive index is approximately 2.0 at 590 nm in water. The surface of the colloidal particles was subsequently coated with silica to produce ZnS@silica core-shell particles.

Molecular Sensing Efficiency of Gold-Silver Alloy Nanowires

채원식,Hee-Ok Lee,Eun-Mee Kim,Hyunung Yu 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4

no abstract

스텝 운동 기구를 사용한 운동 시 발의 위치가 하지 근육 활동에 미치는 영향 분석

채원식 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

W. S. CHAE. Electromyographic Analyses of the effects of different foot positions during exercise on a stair-climbing machine. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 207-219, 2005. The purpose of this study was to determine the effect of the foot rotation on the lower limb muscles. Fourteen subjects performed step-up/step-down at a cadence of 80 beats/min, exercises with the foot neutral, 35?internally rotated, and 35?externally rotated, respectively. For each variable, a one-way analysis of variance (ANOVA) was used to determine whether there were significant differences between genders and among the eight types of jump. When a significant difference was found in jump type, post hoc analyses were performed using the Tukey procedure. A confidence level of p < .05 was used to determine statistical significance. The results showed that significant changes in averaged IEMG values occurred with the internal rotation of the foot in the lateral gastrocnemius during the knee extension, and in the of the foot produced a significantly lower Averaged IEMG values than the neutral foot position in the medial gastrocnemius. The results also found that the peak IEMG activity of the rectos femoris during the knee extension for the external rotation of the foot was significantly higher than the corresponding values in the neutral position of the foot, while the intenal rotaion of the foot exhibited a significant difference with the neutral position of the foot in the semitendinosus during the knee flexion. In general, the foot rotation position did not influence the average IEMG and Peak IEMG values of most muscles. The practice of adopting foot rotation to selectively strengthen individual muscles of the lower limb was not supported by this study. The external rotation of the foot produced high muscle activities in the quadriceps during the knee extension. For the knee extension, therefore, maintaining a laterally rotated position should be need for stable and comfortable position.

인(人) 물(物) 돈 시간

채원식 한국사법행정학회 1977 사법행정 Vol.18 No.12