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권혁규 국제물리치료연구학회 2022 Journal of International Academy of Physical Ther Vol.13 No.1
Background: The rounded shoulder posture (RSP) causes the protraction, downward rotation, and anterior tilt of the scapula. Many studies reported that various interventions for the RSP could be helpful for RSP correction. However, no study has reported on the effect of an orthosis on the RSP. Objectives: To investigate the effect of an orthosis on the RSP in comparison with kinesio taping in 32 participants with RSP. Design: Quasi-experimental study. Methods: Thirty-two participants with RSP were randomly assigned into the kinesio taping group (n=15) and orthosis group (n=17). Kinesio taping was applied as follows: 1) both sides of the spine in a vertical direction from C7 to T12. 2) Both sides of the spine in an oblique direction from the coracoid process of the scapula through the acromion to the T12. Orthosis was tried on, and a pull adjustment strap was used to correct the RSP for each participant. Results: Both groups showed significant differences in the height of the acromion to the ground, forward head angle, forward shoulder angle, visual analog scale, and neck disability index within each group. However, no significant differences in all measurements were observed between the two groups. Conclusion: Orthosis for the RSP with exercise would improve the correction of the RSP as much as kinesio taping.
염생식물 나문재의 여러 가지 환경 조건 하에서의 종자 발아 및 초기생장특성
권혁규,정재혁,이승재,정남진 한국작물학회 2016 한국작물학회지 Vol.61 No.3
This research was carried out to investigate the germination and seedling growth characteristics of the halophyte Suaeda asparagoides under various salt concentrations, temperatures, and the presence or absence of light S. asparagoides has a non-endospermic dicotyledonous seed structure that is go stone-shaped with a dark brown color and covered by a star-shaped perianth. Germination within the temperature range 5~40°C varied from 8% to 65%. The highest germination occurred at 15°C. In seeds exposed to salt concentrations in the range 0~400 mM, the highest germination occurred at 0 mM, and the germination progressively decreased as the salt concentration increased. When the perianth of the seed was removed, the germination increased significantly. In the presence or absence of light, germination under white light was 5~20% higher than that under darkness, which varied according to salt concentrations in the range 0~300 mM. The plant growth of S. asparagoides, evaluated by plant height, branch number, root length, fresh weight, and dry weight, was higher in the concentration range 50~100 mM, and it decreased in the other concentrations. In conclusion, the seeds of S. asparagoides showed higher germination in fresh water at low temperature of approximately 15°C under light when the perianth was removed, and the plant growth was higher at salt concentrations of 50~100 mM.
권혁규,도현진,김혜정,오승원,임열리,최재경,조희경,권혁중,조동영 대한가정의학회 2010 Korean Journal of Family Medicine Vol.31 No.1
Background: Constipation is one of the most common digestive complaints. Although, there are increased interest on the socioeconomic effect of constipation and studies associated with quality of life on constipation, there is no study about the infl uence of constipation onto quality of life (QOL) in Korea. We studied the impact of functional constipation on QOL. Methods: Between March to June 2008, person to person survey with 844 elderly aged over 60 years was performed at two senior care centers, a public health center, and secondary hospital in Seoul metrocity and Chung-ju city. The diagnosis of functional constipation was based on the Rome III criteria and QOL was measured by the Medical Outcomes Study (MOS)36-Item Short-Form Health Survey (SF-36). Results: The average age was 73.6 years and the prevalence rate of constipation was 20.3%. The average SF-36 score was 63.5 in total population, 57.9 in constipation group, and 64.9 in normal group. Conclusion: These results suggest that the constipation lowers QOL in adults aged over 60 years old. Further study will be necessary to explore if QOL changes according to the severity of constipation and its treatment and to assess QOL using a disease-specifi c measurement tool that can be used for Korean environment. 연구배경: 변비는 임상에서 가장 흔히 접하는 소화기 증상 중하나이다. 변비에 대한 사회적, 경제적 영향에 대한 관심이 증가하고 삶의 질과의 관련성에 대한 연구가 많아지고 있지만,국내에서는 변비에 대한 유병률에 대한 연구 외에 삶의 질에관한 연구는 없는 실정이다. 이에 저자들은 변비와 삶의 질과의 관련성에 대한 연구를 시행하였다. 방법: 2008년 3월부터 6월까지 서울시와 충주시의 노인 복지관 두 곳과 일개 보건소, 서울시와 충주시의 일개 2차 병원을조사 대상 지역으로 하였으며, 60세 이상의 노인 844명을 대상으로 하여 설문 조사를 실시하였다. 변비의 진단은 2006년 발표된 로마기준 III를 사용하였고, 삶의 질은 36-Item Short-Form Health Survey (SF-36)으로 측정하였다. 결과: 평균 연령은 73.6세였고, 변비의 유병률은 20.3%였다. SF-36 점수의 전체 평균은 100점을 만점으로 할 때 63.5점이었고, 변비군에서의 평균은 57.9점이었고, 정상군에서의 평균은64.9점으로 관련요인이 통계적으로 유의한 차이를 보였다. 결론: 변비는 유의하게 삶의 질을 저하시킨다. 향후 개인의삶의 질이 변비의 심한 정도와 치료에 따라 변화하거나 차이가 있는 지에 대한 연구와 우리나라 실정에 맞게 사용될 수 있는 질병 특이적인 측정도구를 이용하여 삶의 질을 평가하는연구가 필요할 것으로 생각된다.
권혁규,박진우,김병국,한정우 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.5
LaBO3 (B = Cr, Mn, Fe, Co, and Ni) perovskites, the most common perovskite-type mixed ionic-electronic conductors (MIECs), are promising candidates for intermediate-temperature solid oxide fuel cell (IT-SOFC) cathodes. The catalytic activity on MIECbased cathodes is closely related to the bulk ionic conductivity. Doping B-site cations with other metals may be one way to enhance the ionic conductivity, which would also be sensitively influenced by the chemical composition of the dopants. Here, using density functional theory (DFT) calculations, we quantitatively assess the activation energies of bulk oxide ion diffusion in LaBO3 perovskites with a wide range of combinations of B-site cations by calculating the oxygen vacancy formation and migration energies. Our results show that bulk oxide ion diffusion dominantly depends on oxygen vacancy formation energy rather than on the migration energy. As a result, we suggest that the late transition metal-based perovskites have relatively low oxygen vacancy formation energies, and thereby exhibit low activation energy barriers. Our results will provide useful insight into the design of new cathode materials with better performance.
Cryopreservation of winter-dormant mulberry buds using two-step freezing
권혁규,김기영,박슬기,정찬영,Sang Kug Kang,Ik Seob Cha,김성완,김성렬,Hyo-Eun Lee,Haeng Hoon Kim,박종우 한국잠사학회 2023 International Journal of Industrial Entomology Vol.47 No.2
Genetic resources of mulberry trees are commonly preserved as trophosomes, which are vulnerable to environmental factors, such as natural disasters, diseases, and pests. This study establishes a basic protocol for ultra-low temperature cryopreservation of mulberry trees using a two-step freezing process. The procedure was established using the ‘‘Daeshim’’ variety and then tested on genetic resources from 24 other mulberry varieties. Samples were first dried to a moisture content of 33–43% in a low-temperature forced-air chamber at −5 °C, then slowly frozen from −5 °C to −20 °C, and preserved in liquid nitrogen (−196 °C). To determine the regeneration rate, isolated dormant buds were inoculated into MS basal medium, and grown shoots were grafted onto 1-year-old rootstock via chip budding and then cultured. After freezing in liquid nitrogen, the ‘‘Daeshim’’ variety exhibited a survival and regeneration rate of more than 70% and 50%, respectively. Applying the two-step freezing process to genetic resources from 24 mulberry species yielded average survival and regeneration rates of 85.3% and 75.5%, respectively. Morus alba showed survival and regeneration rates of 100%, confirming the efficacy of the two-step freezing method. These results indicate the high feasibility of ultra-low-temperature cryopreservation through two-step freezing of dormant buds from mulberry genetic resources. Additional research is required into the variations in regeneration rates with freezing period in liquid nitrogen.