흡기근육 훈련과 유산소운동의 동시적용이 심폐반응과 폐기능에 미치는 영향

정현진,이대택 한국운동생리학회(구 한국운동과학회) 2012 운동과학 Vol.21 No.3

정현진, 이대택. 흡기근육 훈련과 유산소운동의 동시적용이 심폐반응과 폐기능에 미치는 영향. 운동과학, 제21권 제3호. 373-384, 2012. 흡기근 훈련을 동반한 유산소운동이 흡기근력, 폐기능, 최대산소섭취량(maximal oxygen uptake; VO2max)에 어떠한 영향을 미치는지 연구하였다. 24명의 건강한 대학생이 3 그룹으로 나뉘어 6주간의 실험에 참여하였다. 대상자들은 호흡근육훈련(RTG; n=8), 유산소성달리기훈련(REG; n=8), 호흡근육 및 달리기훈련(BTG; n=8) 그룹으로 나뉘었다. 실험전과 후 폐기능, 최대흡기압력(maximal inspiratory pressure; PImax), VO2max가 평가되었다. RTG는 실험기간 동안 흡기근육훈련 (inspiratory muscle training; IMT) 프로그램에 참여하였으며, PImax 의 50 % 강도로, 하루 2회, 주당 4일, 회당 30회 훈련하였다. REG는 개인별 VO2max의 70-75 % 강도로, 하루 1회, 주당 4회, 회당 30분 달리기 훈련을 하였다. BTG는 같은 기간 동안 IMT와 달리기훈련 모두에 참여하였다. 실험기간 중 대상자들의 체격변인과 폐기능 변인은 변하지 않았다. VO2max는 RTG, REG, BTG에서 각각 6.1±3.3 %, 5.9±6.6 %, 10.0±8.3 % 증가하였고(p< .05), PImax 또한 RTG, REG, BTG에서 각각 21.7±14.3%, 19.7±12.0 %, 27.0±12.1 % 증가하였으나(p< .05), 그룹 간의 유의한 차이는 나타나지 않았다. 결론적으로, 모든 그룹에서 향상이 관찰되었으며, 흡기근 훈련과 유산소운동을 동반한 그룹에서 VO2max와 PImax의 가장 큰 향상을 보였다. Jung, H. J., Lee, D. T. Impact of concurrent inspiratory muscle and aerobic exercise training on pulmonary function and cardiopulmonary responses, Exercise Science, 21(3): 373-384, 2012. The effects of inspiratory muscle training in conjunction with aerobic exercise on inspiratory muscle strength, pulmonary function, and maximal oxygen uptake (VO2max) were examined. Twenty four healthy collegiate men were divided into three groups; respiratory muscle training group (RTG; n=8), running exercise group (REG; n=8), and both respiratory muscle training and running group (BTG; n=8). Their pulmonary function, maximal inspiratory pressures (PImax), and VO2max were assessed before and after intervention. RTG underwent inspiratory muscle training(IMT) with load set to 50 % of PImax, 30 times per session, twice a day, 4 days a week REG ran on a treadmill at 70-75 % of VO2max for 30 min a day, 4 days a week, BTG participated both IMT and the running exercise. Participant`s anthropometric parameters and pulmonary function were not changed. VO2max increased by 6.1±3.3 %, 5.9±6.6 %, and 10.0±8.3 % in RTG, REG, and BTG, respectively (p< .05), and PImax also increased by 21.7±14.3 %, 19.7±12.0 %, and 27.0±12.1 % in RTG, REG, and BTG, respectively, but no group differences were found. Based on the study, although statistically insignificant, BTG showed the biggest increase of VO2max and PImax indicating a possible synergic effect of inspiratory muscle training and aerobic exercise on respiratory responses.

무경운 콩 재배를 위한 유기질 비료와 화학비료의 적정 시비법

정현진,박형준,권수정,유진,김숙진,정근욱,김홍식,우선희 한국작물학회 2016 한국작물학회지 Vol.61 No.4

The present study was conducted to establish the optimal fertilization type and method for no-tillage during the first year of No-tillage (NT) and Conventional-tillage (CT) practices for soybean, using different types of fertilizers. In this experiment, the culm length and stalk diameter showed a greater response to fertilization with surface irrigation than to conventional fertilization. The fastest flowering period (July 28) occurred using chemical fertilization applied via subsurface irrigation. Comparing maturation based on growth characteristics and flowering date revealed that fertilization with subsurface irrigation was more effective for the growth of crops than other methods. Regarding yield, there was no significant difference between livestock and chemical fertilizers in subsurface irrigation, but there were significant differences between these fertilizers when using conventional fertilization methods. Based on the results, livestock fertilizer with subsurface irrigation effectively enhanced crop quantity. Nitrogen absorption of plants using subsurface irrigation was more effective than that using conventional fertilization. Regarding phosphorus absorption of plants, chemical fertilizers showed higher absorption than did livestock fertilizers for both subsurface irrigation and conventional fertilization. Unlike nitrogen, phosphorus was highly absorbed using conventional fertilization. Absorption of phosphorus and potassium were similar but phosphorus was not absorbed using livestock fertilizers applied either using subsurface irrigation or with conventional fertilization.

탄소/탄소 복합재 매트릭스 전구체로서의 메조페이스 핏치의 제조 및 특성에 관한 연구

정현진,임연수 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.12

A study on mesophase pitch as a matrix precursor of carbon fiber reinforced carbon (C/C) composite has been recently presented. This study is concerned with the production of mesophase pitch as matrix precursors for C/C composite from coal tar pitch. A commercial coal tar pitch was heat-treated at 25$0^{\circ}C$ for 2 hours to remove low molecular weight fraction from the pitch then increasing the temperature of the pitch to between 350~45$0^{\circ}C$ to produce mesophase pitch. The pitch was continuously stirred during this time and nitrogen gas was continuously bubbled through the pitch. Spherical and bulk mesophases were formed in the pitch after heat-treatment,. Parent and mesophae pitches were characterized by elemental analysis coke yield solubi-lity in tetrahydrofuran and hexane and an optical microscopy to measure the mesiophase content. It was neces-sary to produce C/C composite that a mesophase pitch with about 30-40 vol% mesophase spherulites can be infiltrated into a fiber preform without a filter effect as a matrix precursor conditions. This condition was satisfied with mesophase pitch heat treated at 40$0^{\circ}C$ for 2 hours. The other heat treatment conditions showed the nuclei of mesophase or bulk mesophae which were not satisfied with the matix precursor condition.

Mixed alkali effect on the luminescence characteristics of color conversion glasses

정현진,전대우,김진호,이영진,이미재,황종희,박현아,임형석,이정수,박태호,신동욱 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7

The influence of K2O/R2O (R2O = Na2O+K2O) on some characteristics of color conversion glass were studied using a BaOZnO-B2O3-SiO2glass. One reference glass, comprised of 40 mol% of BaO and 20 mol% of the other three components, wasused, and 5 wt% of an alkali oxide was added to the other five glass samples. The ratio of the alkali oxides used were K2O/R2O (where R2O = Na2O+K2O) 0, 0.25, 0.5, 0.75, and 1. Six color conversion glass samples were prepared by sintering amixture of glass frits and a YAG phosphor. The content of the YAG phosphor was maintained at 5 wt%. The characteristicsof the color conversion glasses, with respect to luminous efficacy, CIE (Commission International de I'Eclairage) chromaticity,CCT (Correlated Color Temperature), and CRI (Color Rendering Index) were analyzed based on PL spectra. Theluminescence properties of the color conversion glass with K2O/R2O = 0.5 were nearly identical to those for the reference glasseven though it contained 5 wt% alkali oxides.

OLED 레이저 실링용 글라스 프릿에서 V₂O₅ 함량 및 가소성 분위기가 접합 특성에 미치는 영향

정현진,이미재,이영진,김진호,전대우,황종희,이정수,양윤성,육수경,박태호,문윤곤,Jeong, HyeonJin,Lee, Mijai,Lee, Youngjin,Kim, Jin-Ho,Jeon, Dae-Woo,Hwang, Jonghee,Lee, Jungsoo,Yang, Yunsung,Youk, Sookyung,Park, Tae-Ho,Moon, Yun-Gon 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8

In this study, the effect of vanadium oxide ($V_2O_5$) content and pre-sintering atmosphere on sealing property of glass frit that consisted of $V_2O_5-BaO-ZnO-P_2O_5-TeO_2-CuO-Fe_2O_3-SeO_2$ was investigated by XPS (X-ray photoelectron spectroscopy). The content of V2O5 was changed to 15, 30, and 45 mol%, and the pre-sintering was carried out in air and $N_2$ condition, respectively. XPS analysis conducted before and after laser irradiation with identical sample. Before laser treatment, glass frits that were pre-sintered at air condition showed both $V^{4+}$ and $V^{5+}$, but the valence state was changed to $V^{5+}$ after laser irradiation when the glass frits contained 30 and 45 mol% $V_2O_5$; this change led to non-adhesive property. On the other hand, glass frits that were pre-sintered at $N_2$ condition exhibited only $V^{4+}$ and it showed fine adhesion irrespective of the $V_2O_5$ content. As a result, the existence of $V^{4+}$ seems to be a major factor for controlling the adhesive property of glass frit for laser sealing.

Effect of Testosterone Replacement Therapy on Cognitive Performance and Depression in Men with Testosterone Deficiency Syndrome

정현진,신홍석 대한남성과학회 2016 The World Journal of Men's Health Vol.34 No.3

Purpose: We aimed to evaluate the effect of testosterone replacement therapy (TRT) on cognitive function and depression in men with testosterone deficiency syndrome.Materials and Methods: We carried out a prospective, placebo-controlled trial involving 106 men with total testosterone levels <3.3 ng/mL and symptoms of hypogonadism. Based on whether the patients received TRT (injection with 1,000 mg testosterone undecanoate) or a placebo (advice to modify lifestyle), the study population was divided into a TRT group (n=54) and a control group (n=52).Results: The age among patients in the TRT and control groups was 56.7±12.6 years and 57.8±11.4 years, respectively (p>0.05). At baseline, no significant differences between the TRT and control groups were noted regarding serum testosterone or prostate-specific antigen levels, or regarding the scores for aging symptoms (Aging Males’ Symptoms scale), erectile function (5-item International Index of Erectile Function questionnaire), cognitive function (Korean Mini-Mental State Examination), and depression (Beck Depression Inventory). At 8 months after intervention total serum testosterone levels and erectile function scores had significantly increased (p<0.05), whereas the scores for aging symptoms and depression had significantly decreased (p<0.05) in the TRT group; no significant improvement in any parameters was noted for the control group. Notably, significant improvement in cognitive function was noted among patients with cognitive impairment at baseline (cognitive function score <25) who received TRT.Conclusions: TRT may be considered in men with testosterone deficiency syndrome if low testosterone levels are associated with depression or cognitive impairment.

Carbon Monoxide Binding to NicKel(I) Macrocyclic Complexes Generated by Electrochemical Method

정현진,방효춘,백명현,Jeong, Hyeon Jin,Bang, Hyo Chun,Baek, Myeong Hyeon Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.5

참깨의 논재배 시 생육변화와 침수해 반응에 따른 프로테옴 해석

정현진,권수정,조성우,전현정,정기열,조건,정주희,우선희 한국작물학회 2017 한국작물학회 학술발표대회 논문집 Vol.2017 No.-

[설교자를 위한 성서읽기] 함께 있었다

정현진 대한기독교서회 2018 基督敎 思想 Vol.714 No.-

[설교자를 위한 성서읽기] 살고 싶어 죽겠다!

정현진 대한기독교서회 2018 基督敎 思想 Vol.716 No.-