http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
태권도 품새 수련이 아동의 심박수, 심근산소소비량, 에너지 대사에 미치는 영향
정성태,전태원,박익렬,정덕조,우재홍,이광희,이동기,강현주 서울대학교 체육연구소 2000 서울大學校 體育硏究所論集 Vol.21 No.1
The Taegeuk Poomse 1 through 8 of Taekwondo are based upon eight major branches of philosophical theories. The propose of this study was to investigate the nfluence of Taekwondo poomse trainning on heart rate, MVO2, energy metabolism in primary school students. Subjects for this study were eight male the fifth∼sixth grades students who participated in exercise program consist of Taekwondo poomse trainning in dojang which is located in Shinlim-2dong, Kwanak-Gu, Seoul(12.7± 0.5years, 150.8 ±4.6cm, 45.1 ± 9.4kg, 24.9 ± 9trainning length). The results of thet this study are as follows: 1) The average of heart rate was Taegeuk Poomse 1 through 8 of Taekwondo 90.57± 4.gbeats/min in rest and 139.7 ± 17.5beats/min in exercise. The minimum heart rate was 89.0±2.8, peak heart rate was 167.1 ±6.4 in exercise. It was ranged from 42% to 80% 2) of the max heart rate and ranged 42 to 65%HRmax. Taegeuk 1 Jang was differenced with others Jangs significantly(p<0.05), 2) The time of the Taegeuk 1 through 8 Jang of Taekwondo was 5minutes 12seconds. Heart rate was ranged from 90.6 ± 7.85beats/min to 171.8 ±8.Ibeats/min and increased linearly. 3) The average of the MVO2 was 11.1 ±0.78mmHg · bpm-3 in rest and 19.1 ± 1.2mmHg ㆍbpm-3 in exercise. MVO2 was ranged from 10.5mmHg · bpm-3 to 20.3mmHg · bpm-3. There were not difference between Taegeuk Poomses(p<0.05). 4) The energy metabolism was as follows: Mean VO2 Respiratory exchange ratio, energy consumption were 0.51(V02L/min),0.71(RQ),2.32Ckca1/min) in rest respectively. but In exercise Mean VO2 Respiratory exchange ratio, energy consumption were 0.89 ± 0.18( V 02L/min), 0.79±0.08(RQ), 4.26±0.51(kcal/min) respectively . The difference was only between Taegeuk 1 Jang and Taegeuk 3 Jang(p<0.05). This study showed that the Taekwondo Poomse trainning was proper exercise for fitness, body composition and weight control in normal, abnormal(obese) children because the Taekwondo trainning are dynamic and exciting sport.
A Study on the Reduction of Cogging Torque for the Skew of a Magnetic Geared Synchronous Motor
Jo, Ik-Hyun,Lee, Hyung-Woo,Jeong, Geochul,Ji, Woo-Young,Park, Chan-Bae IEEE 2019 IEEE transactions on magnetics Vol.55 No.2
<P>This paper is a study on the application position of skew in order to reduce the cogging torque of a magnetic geared synchronous motor (MGM). The cogging torque affects the noise and vibration of the motor, so it should be reduced as much as possible. To solve this problem, a conventional permanent magnet (PM) synchronous motor is skewed to a PM. However, unlike other synchronous motors, the MGM has pole pieces (PPs), and a larger cogging torque is generated due to a larger reluctance difference. There have been few studies on the reduction of cogging torque of MGM, so it is essential to study the skew structure of MGM. Therefore, this paper has derived the optimum skew method by comparing and analyzing three models of MGM skewed to PM, PP, and PM and PP simultaneously.</P>
Ik Hyun Jo,Chang Nyol Paik,Yeon-Ji Kim,Ji Min Lee,Soo Yeon Choi,Kee Pyung Hong 대한소화기 기능성질환∙운동학회 2023 Journal of Neurogastroenterology and Motility (JNM Vol.29 No.1
Background/AimsLactase deficiency, which has many similarities with small intestinal bacterial overgrowth (SIBO), causes various gastrointestinal symptoms. We estimate the prevalence of SIBO in patients with intestinal symptoms from dairy products and investigate the association between lactase deficiency (LD) and SIBO. MethodsThis prospective study included patients with functional intestinal symptoms from dairy product indigestion. A questionnaire on gastrointestinal symptoms, a hydrogen (H2)-methane glucose breath test (GBT) for SIBO, and lactose intolerance quick test (LQT) for LD using upper gastrointestinal endoscopy were performed. ResultsA total of 88 patients, 29 (33.0%) with severe and 36 (40.9%) with mild LD were included. Sixteen patients (18.2%) were GBT positive. Patients with LQT negativity indicating severe LD showed a higher positivity to GBT or GBT (H2) than the historic controls (27.6% vs 6.7%, P = 0.032). There was no difference in the items on the symptom questionnaire according to the presence of LD or SIBO, except for higher symptom scores for urgency in GBT-positive patients. There were more LQT-negative patients in the GBT (H2)-positive group than in the other groups (27.6% vs 10.2%, P = 0.036). Moreover, only GBT (H2)-positivity was significantly associated with a higher risk of LQT negativity in multivariate analysis (OR, 4.19; P = 0.029). ConclusionsSIBO producing H2 is common in patients with severe LD suspected lactose intolerance. SIBO may be a new therapeutic target for managing intestinal symptoms in patients with lactose intolerance.
A Topology Study for the Application of Magnetic Geared Motor as Traction for Urban Railway Vehicle
Jo Ik-Hyun,Lee Ju,Lee Hyung-Woo,Lee Jae-Bum,Lim Jae-Hyeon,Kim Seong-Hwi,Park Chan-Bae 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6
This paper is a comparative analysis study on topologies of magnetic geared motors for the application of railway vehicle traction systems. The magnetic geared motor (MGM) is a system in which a magnetic gear and a permanent magnet synchronous motor (PMSM) are mechanically combined, and it consists of a dual rotor that rotates at different speeds. Due to these characteristics, it has the advantages of high-power density and lightweight compared to the existing traction system. However, since the input/output relationship and electromagnetic field characteristics of this motor are completely different depending on topology, it is important to select an appropriate topology according to the application. Recently, some studies have been conducted to reflect this in industry or electric vehicles, but there is no study as a traction motor for urban railway vehicles. Therefore, in this paper, the FEM model was presented by selecting the MGM topology suitable for railway vehicles. Also, it was verified through a miniature model experiment for the corresponding topology.
Jo Ik-Hyun,Lee Ju,Lee Hyung-Woo,Lee Jae-Bum,Lim Jae-Hyeon,Kim Seong-Hwi,Park Chan-Bae 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
This paper presents the simplified equation of skew for pole-pieces of dual-rotor permanent magnet synchronous motor combined with magnetic gear (DR-PMSM) for railway vehicles. Generally, in the case of a permanent magnet synchronous motor (PMSM), the skew is applied to the rotor to reduce the cogging torque. In the case of DR-PMSM, it is structurally or productively more advantageous to apply skew to the pole-pieces (outer rotor) than the inner rotor. However, this method is mathematically complicated and the study on it is insufficient compared to the conventional PMSM. Therefore, this paper introduces simplified equations of optimal pole-pieces skew and the peak to peak of cogging torque according to the skew angle.
Jo Ik Hyun,Lee Kang-Moon,Kim Dae Bum,Kim Ji Won,Lee Jun,Jeen Yoon Tae,Kim Tae-Oh,Kim Joo Sung,Park Jae Jun,Hong Sung Noh,Park Dong Il,김현수,Lee Yoo Jin,Kim Youngdoe 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.3
Background/Aims: Improving quality of life has been gaining importance in ulcerative colitis (UC) management. The aim of this study was to investigate changes in health-related quality of life (HRQL) and related factors in patients with moderate-to-severe UC. Methods: A multicenter, hospital-based, prospective study was performed using a Moderateto- Severe Ulcerative Colitis Cohort in Korea (the MOSAIK). Changes in HRQL, evaluated using the 12-Item Short Form Health Survey (SF-12) and Inflammatory Bowel Disease Questionnaire (IBDQ), were analyzed at the time of diagnosis and 1 year later. Results: In a sample of 276 patients, the mean age was 38.4 years, and the majority of patients were male (59.8%). HRQL tended to increase in both the IBDQ and SF-12 1 year after diagnosis. A higher partial Mayo score was significantly related to poorer HRQL on the IBDQ and SF-12 in a linear mixed model (p<0.01). Inflammatory markers such as C-reactive protein (CRP) or erythrocyte sedimentation rate also showed a negative correlation on HRQL (p<0.05). Patients whose IBDQ score improved by 16 or more (71.2%) in 1 year were younger, tended to be nonsmokers, and had a lower partial Mayo score and CRP than those whose IBDQ score did not. There was no significant association between HRQL and disease extent, treatments at diagnosis, or the highest treatment step during the 1-year period. Conclusions: Optimally controlled disease status improves HRQL in patients with moderate-tosevere UC. The partial Mayo score and inflammatory markers may be potential indicators reflecting the influence of UC on patient`s daily lives.
( Ik Hyun Jo ),( Chang-nyol Paik ),( Ji Min Lee ),( Do Seon Song ),( Yeon-ji Kim ) 대한소화기기능성질환·운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.2
Background/Aims Drugs that stabilize intestinal motility may improve the efficacy of nonabsorbable antibiotics, such as rifaximin, against small intestinal bacterial overgrowth (SIBO). We compared the efficacy of rifaximin alone with that of its combination with trimebutine maleate against SIBO. Methods We performed a randomized double-blind placebo-controlled trial (https://cris.nih.go.kr, no. KCT0004836) that included patients with functional bloating, no constipation, and SIBO using the hydrogen (H<sub>2</sub>)-methane (CH<sub>4</sub>) glucose breath test (GBT). Patients were randomized into 2 groups in a 1:1 ratio, namely rifaximin (1200 mg/day) + trimebutine maleate (600 mg/day) group and rifaximin + placebo group, for 2 weeks. Patients completed a symptom questionnaire and underwent a GBT at baseline and at 1 month after treatment withdrawal. The primary outcome was SIBO eradication. The secondary outcomes included changes in the concentrations of exhaled gases, symptoms, and presence of adverse events. Results The complete eradication rate of SIBO was 35.9% (14/39) in the rifaximin group, and 34.1% (14/41) in the combined group with no significant differences. In both groups, no significant differences were observed in GBT profiles before and after the treatment, respectively. However total breath H<sub>2</sub> and CH<sub>4</sub> concentration were conspicuously decreased in the combined group after treatment. The combined group exhibited substantial relief of bloating. The adverse events were similar in the 2 groups. Conclusion While the combination therapy was not superior over rifaximin alone for SIBO eradication, it improves the symptom of bloating with numerically reducing the concentration of breath H<sub>2</sub>/CH<sub>4</sub>. (J Neurogastroenterol Motil 2024;30:220-228)
조현익(Jo Hyun-Ik) 한국체육과학회 2003 한국체육과학회지 Vol.12 No.2
This study investigated the effects of WOM(Word-of-Mouth) and psychological factors as predictors of customer behavior to purchase golf goods in a sample of 316. Questionnaire was assessed including perceived degree of WOM, consumer value, WOM resource search, and self-efficacy. The reliability of instrument was alpha=.773(p=.05). Result of this study showed that the WOM search motivation had the most powerful effect on perceived degree of WOM Psychological factors influenced on perceived degree of WOM showed enough significant R=.629.