임플란트 보철물에서 임시 접착용 시멘트의 인장결합강도 비교

서경숙,권태엽,권용훈,김교한 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.4

The major disadvantage of cement-retained implant-supported superstructure is difficulty of retrievability. Sometimes, it is recommended that proetheses be provisionally cemented to implant abutment in order to ebaluate occlusion, screw loosening and tissue reaction. The retention of the provisional luting cementedusually employed in this case is considered to be important. This study compared tensile bond strength of gold crowns cemented to machined titanium implant abutments with three provisional luting cements. Also the effect of petrolatum and thermocycling on tensile bond stength were evaluated. Tensile bond strength of provisional luting cement were as follows with the decreasing order of Eugenol (13.06±1.544 kgf), Temp-Bond (9.41±0.737 kgf), Cavex (8.04±0.974 kgf), and Temp-bond with petrolatum (5.28±0.800 kgf). The addition of petrolatum in Temp-bond decreased tensile bond strength significantly (p<0.01). After thermocycling of 1,500 cycles, the tensile bond strengths of the cements were decreased with the order of Nogenol (10.87±3.031 kgf), Temp-Bond (8.1±0.667 kgf), Cavex (7.33±1.103 kgf), Temp-bond with petrolatum (4.88±1.348 kgf). The mocycling decreased the bond strength of Temp-Bond significantly, with no effects no other cements (p<0.01).

Ti표면의 전처리방법이 4-META/MMA-TBB 레진과의 접착강도에 미치는 영향

김교한,서세광 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.2

The present study investigated the effectiveness of several surface pretreatment methods on the bonding of Ti to adhesive resin. Commercially pure Ti and Ti-6Al-4V alloy were bonded by 4-META/MMA-TBB resin to stainless rods. Each specimen was polished with No. 1.000 sandpaper and then treated with various surface treatment methods, such as 50 ㎛ size of Al₂O₃particles sandblasting, tinplating, silicoating, combination of sandblasting and tinplating and combination of sandblasting and silicoating. The surface of pure Ti treated with sandblasting was roughened to irregular and retentive pattern and aluminum content on the treated surface was increased. The surface morphology treated with tinplating was similar to nontreated one and the surface composition showed almost no change. The surface morphology of silicoating groups was similar to the one of silicoated after sandblasting condition and in both group, carbon content was significantly increased. The surfaces morphology of tinplating was not changed at all. The surface observation results of commercially pure Ti and Ti-6Al-4V alloy specimens were similar, but Ti-6Ai-4V alloy specimens were similar, but Ti-6Al-4V alloy showed more amount of tin precipitations at tinplating groups. Average tensile bond strength of each group was ranged from 21.20 to 31.64 MPa. The tensile bond strength of each group did not show a difference at the 0.05 significance in one-way ANOVA test. Fracture mode of each specimens was almost resin cohesive fracture, and some adhesive fracture-like area was proved to be cohesive fracture in higher magnification. Thus, bonding strength of resin-Ti interface was stronger than that of 4-META/MMA-TBB resin itself.

The Impacts of Exercise-Intervention on the Prevention and Treatment of Some Types of Cancer

( Han Kyo Seo ) 한국운동생리학회(구 한국운동과학회) 2021 운동과학 Vol.30 No.1

Cancer is a disease affecting millions of people and one of the primary causes of death worldwide like cardiovascular diseases. Nonpharmacological and nonoperative methods such as proper exercise-intervention, nutrition, maintaining the activity of daily living (ADL), psychological methods can also improve the physical function, cancer progression, and health-related quality of life (HRQOL). However it is extremely important, little light shed on the impacts of exercise-intervention on cancer prevention and treatments. Therefore, the purpose of this study was to analyze the impacts of nonpharmaceutical approaches such as diverse exercise-intervention on cancer prevention and treatments with psychological and physiological health for cancer patients. Moreover, this paper wants to combine knowledge regarding the many experimental papers and systemic reviews of cancer researches and exercise intervention liter-ature. A meta-analysis and systemic reviews of the impacts of an exercise intervention on cancer prevention and treatments were conducted to the PRISMA guidelines. 20 research articles were selected for final inclusion and extraction. And electronic analysis such as PubMed, Google scholar was carried for this study up to May 2020. The search keyword was ‘exercise-intervention and cancer’. We can suggest that physical exercise-intervention might be a suitable combination partner to exercise-related immune therapy in the prevention, delay, and treatment of cancer patients. Moreover, physical exercise-intervention directly enhances the QOL, ADL, healthy life, and even resilience of cancer patients. Therefore, these exercise interventions can be effective at reducing cancer symptoms, and enhancing cancer treatments for diverse and many cancer patients. Reversing low muscle mass can enhance cancer therapy outcomes and mortality. Nutrition strategies also might be helpful. A Follow-up study about specific high-quality tailoring exercise-intervention program on counteracting cancer symptoms, cancer prevention and treatment, physiological and psychological health and HRQOL is urgently needed in this area.

현장 역사교육의 현황과 발전 방안

서한교 ( Han Kyo Seo ) 역사교육학회 2008 역사교육논집 Vol.41 No.-

근감소증 비만인에게 나타나는 대사적 감소증, 면역감소 및 운동효과

서한교(Seo, Han-Kyo) 한국코칭능력개발원 2018 코칭능력개발지 Vol.20 No.2

댄스스포츠와 걷기, 속보, 조깅의 에너지 소비량과 운동강도 비교 연구

서한교 ( Han Kyo Seo ),박익렬 ( Ik Ryeul Park ),김은혜 ( Eun Hye Kim ),김은경 ( Eun Kyung Kim ),김경래 ( Kyung Rae Kim ),김광준 ( Kwang Jun Kim ) 한국운동영양학회 2004 Physical Activity and Nutrition (Phys Act Nutr) Vol.8 No.2

The purpose of this study was to compare the exercise intensity and energy consumption in dancesport and in walking, fast walking, jogging (especially comparing Rumba with walking, Waltz with fast walking, and Cha Cha Cha with jogging). 12 women who teach physical education and dancing at schools performed the experiment. To examine the exercise intensity and energy consumption in walking (75 m/min), fast walking (95 m/min), and jogging (140 m/min), each test was measured by wireless gas analyzer (Vmax ST) for 10 minutes each on treadmill. Three days after, the exercise intensity and energy consumption in dancesport (Rumba, Waltz, Cha cha cha) were tested for 10 minutes each. The tempos of each dance types were 25 bar/min (Rumba), 28 bar/min (Waltz), and 30 bar/min (Cha cha. cha). Conclusions were obtained by measuring the physical changes including energy consumption, oxygen consumption per weight unit, and HR with Vmax ST. Each factors of physical change was measured every twenty seconds during the test. On this basis of analyses, the results are as follows: First, jogging showed the highest level of energy consumption and Cha cha cha, waltz, Rumba, fast walking and walking markedly lesser energy consumption in order. Significant differences were observed when comparing Rumba (55.17 kcal/10 min) with walking (41.49 kcal/10 min) (p>0.05), Waltz (64.36 kcal/10 min) with fast walking (51.41 kcal/10 min) (p>0.05). It is also worthwhile to contrast the energy consumption of Cha cha cha (74.67 kcal/10 min) to that of jogging (84.01 kcal/10 min) (p>0.05). Second, jogging (92.21%) showed the highest exercise intensity. Cha cha cha (91.99%), Waltz (85.96%), Rumba (80.22%), fast walking (72.86%) and walking (65.70%) are following the order. In the examination of exercise intensity, noticeable differences were discerned between Rumba and walking and between waltz and fast walking (p>0.05) respectively. But considering Cha cha cha and jogging, the results of exercise intensity were not differentiated significantly (p>0.05). Thus, it is the unavoidable conclusion that, comparing with walking, fast walking and jogging, dancesport have the advantage of high exercise intensity and energy consumption to meet the purpose of performers without the problem of weather and place condition. Furthermore, dancesport proved to be a useful aerobic exercise that achieves high-energy efficiency in short time. To this extent, dancesport can be recommended as a continuous and regulative aerobic exercise for some people.

12주 간의 규칙적인 운동이 심부전증 환자의 심폐 기능에 미치는 영향

이한준(Han Jun Lee),서한교(Han Kyo Seo),전태원(Tae Won Jun),김경래(Kyeong Lae Kim),박익렬(Ik Ryeul Park),이광희(Kwang Hee Lee),박성태(Sung Tae Park),김기정(Ki Jeong Kim),서동일(Dong Il Seo),박은경(Eun Kyung Park) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.31

The purpose of this study is to examine the effects of regular exercise on cardiopulmonary function in patients with CHF during 12 weeks. 30 patients with CHF (EF<40) participated in this study. The subjects were randomly assigned to three groups; supervised exercise group(N=10), home-based exercise group(N=10), control group(N=10). Exercise testing by cycle ergometry was used as 10W ramp protocol. VO2peak, HRrest, HRpeak, BP, exercise tolerance and half time were analyzed. Exercise intensity was 60%HRR or 60%VO2R. The results of the study can be summarized as follows:1. There was significant difference of VO2peak among three groups. SG and HG wsignificant increased than control group(p<.05). 2. HRrest was decreased significantly after exercise in HG(p<.05). 3. HRpeak was not significant difference among three groups, but significant decreased after exercise in SG(p<.05). 4. SBPrest was no significant difference among three groups. But SG and HG were significant decreased than control group(p<.05). 5. DBPrest was no significant difference among three groups, but significant decreased after exercise in HG(p<.05). 6. Exercise tolerance(duration) was significant increased after exercise in SG and HG(p<.05). But control group was significant decreased after exercise(p<.05). 7. Half time was significant decrease after exercise in both exercise groups(p<.05).

댄스스포츠가 고령 여성의 골밀도 및 골대사 호르몬에 미치는 영향

서한교(Han Kyo Seo) 한국여성체육학회 2007 한국여성체육학회지 Vol.21 No.1

한국여자프로골프 선수들의 상금 순위 집단간 경기력 분석(2010-2017년 자료를 중심으로)

서한교 ( Seo Han Kyo ),김은혜 ( Kim Eun Hye ),박익열 ( Park Ik Ryeul ) 한국리듬운동학회 2018 한국리듬운동학회지 Vol.11 No.1

The purpose of this study is to investigate the annual performance of the higher group(1-50) and the lower group(51-100) based on the data of 800 people provided by KLPGA from 2010 to 2017, analyzing the tendency of change of performance according to the year and analyzing the differences among groups of performance were as follows. First, the prize money average increased from KRW 92,000,000 in 2010 to KRW 191,000,000 in 2017, but it is necessary to consider the low ranking players in a way that 61% of the total prize money is concentrated in the top(1-10). Second, the higher group players(1-50) showed statistically significant improvement in performance from all items as the year progressed. Third, the lower players(51-100) showed a statistically significant improvement in performance from all items as the year progressed. Fourth, the difference between the higher and lower group showed statistically significant superiority among all measures and their performance was consistent. In conclusion, The higher group(1-50) players belonging to the Korea Ladies Professional Golf Association(KLPGA) seem to be preparing for the birth of the second ‘Park In-Bee’ as the years progressively improved greatly in all the measurement items.

댄스스포츠 운동 프로그램이 비만 고령 여성의 체력과 C-반응단백질에 미치는 영향

서한교(Han Kyo Seo),김경래(Kyeong Lae Kim),박익렬(Ik Ryeul Park) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.31

The purpose of this study was to investigate the effects of dancesport program on physical fitness and blood C-reactive protein in obese elderly women. Subjects were composed of training group(12) and control group(7). Training group was assigned to practice Rumba, Cha Cha Cha and Jive(40-80%HRmax intensity in beginner level and amateur level) for 1 hour a day, 3 days per a week for 12 weeks. After 12-week dancesport program, cardiovascular endurance(p<.05), muscle strength and balance(p<.01) was significant difference statistically between two groups. After exercising dancesport program in the training group, Cardiovascular endurance, muscle strength, muscular endurance, flexibility and balance(p<.05) were improved significantly within the groups, but no differences in control groups. There was no difference between two groups on % body fat and significant difference was not observed within the groups. There was no significant difference in blood C-reactive protein between two groups and within the groups respectively. In conclusion, with a long duration of exercise and dietary treatment, positive influences are expected to improve the factors of physical fitness and blood C-reactive protein of the obese elderly people.