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Sung Kyeom Kim(김성겸),Ro Na Bae(배로나),Hyunseung Hwang(황현승),Moo Jung Kim(김무정),Hye Ryeong Sung(성혜령),Changhoo Chun(전창후) 한국원예학회 2010 원예과학기술지 Vol.28 No.6
‘매향’, ‘설향’, ‘금향’, ‘아키히메’와 ‘레드펄’ 딸기 과실 부위에서 환원당, 유기산, 아스코르빈산, 안토시아닌 및 엘라직산의 함량을 비교하였다. 환원당, 유기산, 아스코르빈산 및 안토시아닌 함량은 딸기 표피에서 다른 부위의 함량 보다 유의하게 높았으나 엘라직산의 함량은 딸기 수과에서 높았다. ‘매향’ 딸기의 표피 및 과육에서 아스코르빈산 함량은 각각 69.2와 42.2㎎?100g<SUP>-1</SUP> FW로 다른 품종에 비해 높았다. 그리고 ‘금향’ 딸기의 표피 및 수과에서 안토시아닌 함량은 각각 74.0㎎?100g<SUP>-1</SUP> FW과 36.7㎎?100g<SUP>-1</SUP> DW으로 타 품종에 비해 유의하게 높았으며 ‘설향’ 딸기 수과에서 엘라직산의 함량은 215.5㎎?100g<SUP>-1</SUP> DW로 타 품종에 비해 유의하게 높았다. 딸기 과실의 부위에 따라 바이오 활성 화합물들의 함량은 크게 차이가 있었으며 ‘매향’, ‘설향’ 및 ‘금향’ 딸기 품종은 바이오 활성 화합물들의 함량이 높아 소비자들에게는 고품질 딸기로 인식될 수 있어 국내 육성 품종 딸기의 보급이 확산될 것으로 기대된다. 그리고 본 기초적 결과들은 딸기 가공 분야 및 영양학 연구 분야에도 유용하게 활용될 것으로 판단된다. We evaluated the bioactive compounds including carbohydrates (CH), organic acids (OA), ascorbic acid (AA), anthocyanin (AC), and ellagic acid (EA) in the achenes, epidermis, and flesh of fully ripe strawberry fruits of the ‘Maehyang’, ‘Seolhyang’, ‘Keumhyang’, ‘Akiheme’, and ‘Red pearl’ cultivars. The total contents of CH, OA, AA, and AC were significantly greater in the epidermis than in other tissues, while the EA content was significantly greater in the achenes than in other tissues. The AA content of the epidermis ranged from 49.1-69.2 ㎎?100 g<SUP>-1</SUP> FW and was significantly greater than the content of the flesh, while AA was not detected in the achenes of any of the tested strawberry cultivars. The AA contents of the epidermis and flesh of the ‘Maehyang’ were 69.2 and 42.2 mg?100 g<SUP>-1</SUP> FW, respectively, and were greater than those of the other cultivars. The AC contents in the epidermis and achenes of the ‘Keumhyang’ were 74.0 ㎎?100 g<SUP>-1</SUP> FW and 36.7 ㎎?100 g<SUP>-1</SUP> DW, respectively, greater than those of the other cultivars. The EA content of the achenes of the ‘Seolhyang’ was 215.5 ㎎?100 g<SUP>-1</SUP> DW, significantly greater than those of the other cultivars. Results indicate that the antioxidant levels and other chemical compounds of strawberry fruits vary significantly among different fruit tissues. Our results also suggest that the recently introduced Korean ‘Maehyang’, ‘Seolhyang’, and ‘Keumhyang’ contain higher levels of antioxidants than other major June-bearing strawberry cultivars. These cultivars are feasible selections for both growers and consumers.
Sang Ho Rha,Un Ki Kim,Jisim Jung,Hyo Kyeom Kim,Yoon Soo Jung,Eun Suk Hwang,Yoon Jang Chung,Mijung Lee,Jung-Hae Choi,Cheol Seong Hwang IEEE 2013 IEEE transactions on electron devices Vol.60 No.3
<P>Asymmetric Schottky contact thin-film-transistors (ASC-TFTs) with an amorphous- In<SUB>2</SUB>Ga<SUB>2</SUB>ZnO<SUB>7</SUB> channel were fabricated, and their operation characteristics were examined. Ti, Ni, and Pt were evaluated as source/drain metal, and the variations in the device performance were analyzed in terms of energy level and bias polarity, which were carefully simulated to understand the influence of the contact properties on the device performance. The contact nature largely influenced the distribution of potential under the given gate and drain biases, as well as the accompanying carrier accumulation layer and current path formation. Schottky-type contact induced conduction path formation even on the back surface of the channel when drain voltage was high even with sufficiently high gate bias being applied. Based on these results, by applying different metal for each source and drain metal, ASC-TFTs integrating TFTs and Schottky diodes were fabricated, which showed a rectification ratio of drain current higher than 10<SUP>8</SUP> according to the bias direction. In addition, the transfer and output characteristics of ASC-TFTs were evaluated for various operation regimes, and the roles of the Schottky junction in device operation were studied in detail.</P>
Hyo Kyeom Kim,Sang Young Lee,Il-Hyuk Yu,Tae Joo Park,Choi, R.,Cheol Seong Hwang IEEE 2012 IEEE electron device letters Vol.33 No.7
<P>This letter compares TiN/La/TiN (TLT) and TiLaN (TLN) metal gates on HfO<SUB>2</SUB>/Si substrates, focusing on the flatband voltage (<I>V</I><SUB>FB</SUB>) modulation and interfacial layer (IL) scaling. The maximum <I>V</I><SUB>FB</SUB> modulation value of the TLT/HfO<SUB>2</SUB>/Si stack was -423 mV compared to the <I>V</I><SUB>FB</SUB> of the TiN single-metal case, which is superior to that of TLN (-247 mV). This is because the TiN barrier layer in the TLT metal stack prevents interfacial oxidation. Both TLT and TLN gate metals effectively shrink the IL thickness to values below 0.5 nm. In the case where the TLT metal gate was annealed at 600°C for 30 s, the IL thickness was almost zero, and the equivalent oxide thickness was decreased to 0.8 nm even though the maximum temperature was limited to 600°C.</P>
장기간 복합운동이 고령자의 심폐기능과 신체조성에 미치는 영향
김성수(Sung Soo Kim),심영제(Young Jae Sim),황문현(Moon Hyeon Hwang),변재종(Jae Jong Byeon),최요섭(Yo Seob Choi),서경호(Kyeong Ho Seo),김만겸(Man Kyeom Kim) 한국사회체육학회 2000 한국사회체육학회지 Vol.13 No.-
This study was designed to investigate the effect of a year aerobic combined with resistance weight training on cardiorespiratory function and body composition of elders. The subjects for this study were thirty healthy elderly people who were members of seniors tower at Song-Do hospital and didn`t have any history of cardiorepiratory disease. The subjects were divided into two groups: aerobic combined with resistance weight training group(n=16), and aerobic training group(n=14). Both groups have been trained three times a week for a year. The exercise program for both groups was made up of a 15-minute warm-up, cool-down. Stretching was performed every ten minutes for the prevention of injuries which could occur during the main exercise and quick recovery of the used muscle. Aerobic training was performed for each 10-20minutes using the treadmill and cycle ergometer at the intensity of 50-70% HRmax. The resistance weight training was performed for each 3set using the reg press, reg extension, reg curl, back extension, abdominal flexion, and torso at 60% of one-repetition maximum. One repetition maximum(1RM) of each person in all the six terms measured prior to training performance. For the data, all the measurements were represented b, mean(M) and standard deviation(SD) using SAS Package(version 6.12). Statistical techniques for data analysis were ANCOVA to determine the difference among groups. The 5% level of significance was used as the critical level for acceptance of hypotheses for the study. The following results were obtained from this study. 1. In the aerobic exercise group and the aerobic combined with resistance weight training group, rest RPP decreased significantly after a year training. 2. In the aerobic exercise group and the aerobic combined with resistance weight training group, there wasn`t a significant difference in rest HR after a year training. 3. In the aerobic exercise group and the aerobic combined with resistance weight training group, there wasn`t a significant difference in V02max after a year training. 4. In the aerobic exercise group and the aerobic combined with resistance weight training group, there wasn`t significant difference in rest systolic blood pressure while diastolic blood pressure decreased significantly after a year training. 5. In the aerobic exercise group and the aerobic combined with resistance weight training group, waist to hip ratio decreased significantly while fat mass(kg), %body fat, and lean body mass(kg) weren`t significant difference after a year training. In conclusion, the result of this study suggests that this kind of aerobic combined with resistance weight training can contribute to the better improvement in the cardiorespiratory function. In the changes of body composition, though there was only decreased significant waist to hip ratio between the two groups. Although the statistical significance of the change was not discovered, aerobic combined with resistance weight training group showed that the tendency of fat mass(kg), %body fat loss and lean body mass(kg) were increased after a year training. Therefore, carrying out a long period of aerobics and resistance weight training at the same time is considered to be proper exercise programs to the development risk of heart disease and to prevent all kinds of regressive diseases and reduce body fat in elderly people. More effective and various exercise programs should be developed in the near future to be helpful with the elderly people.