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강갑중,강호철 釜慶大學校 2002 釜慶大學校 論文集 Vol.7 No.-
In this study, 375 high school girls and boys (193 technical high school students and 182 human high school students) in Busan as the subject of this study were examined by questions papers to see students' Conception about Force and Motion in the technical high school. The results of this study are as follows. 1)The proportion of the correct answers of the technical high school students are lower than that of the human high school students. 2)The difference of the number of the correct answer of the technical high school students is slight, whereas that of the human high school students is wide. In general, students were inclined to believe that Force of Action and Reaction between two objects would work more strongly in proportion to mass and speed of objects and that objects moving actively rather than passively would be affected by more force. Also, students tended to believe that Gravitational Force acting on falling objects increases in proportion as objects were falling down fast and that Gravitational Force doesn't act in the airless place. In conclusion, to teach technical high school students' Conception of Force and Motion rightly, it is thought that teachers should instruct students seriously about students' misconceptions that are not corrected easily through the production of teaching materials for special use and the improvement of teaching methods.
朴哲浩,朴吉俊,李相于,金永明,朴贊熙,玄松子,呂南會,朴相甲,金榮俊 東亞大學校附設스포츠科學硏究所 1989 스포츠科學硏究論文集 Vol.7 No.-
This study aims at revealing the physiological responses of dehydration (DH) and rehydration (RH) in intermittent exercises at the work intensity of 70% HR max. First, with general student public, three times of exercise (each for 20 minutes) at the given work intensity were taken, with a break for 25 minutes respectively. Their heart rate, rectal temperature and plasma electrolyte concentration both DH and RH were measured. Second, in two groups of athletes and non-athletes, 9 rounds of exercise (for 100 minutes) and 8 breaks (for 60 minutes) were taken, with RH forced 10 times to compensate for the subjects' water loss. Their change in sweat loss and plasma electrolyte concentration as well as the IVDP(Intensive Voluntary dehydration Phenomenon) were experimented. The summary of this research follows. 1) Mean heart rate and rectal temperature in intermittent exercises were higher at DH than at RH, growing up at the increasing level of DH. 2) RH saw no change in the plasma concentration of Na+, K+ and Cl-, while DH observed a significant increase. 3) HCO₃made a significant decrease at DH before growing up. 4) Mg++ had no change, while Ca++ increased significantly at RH and DH. 5) Lactate showed an increase with significance at RH and DH, especially greater at DH. 6) Osmotic pressure increased meaningfully at DH. 7) Anion gap increased significantly at DH and RH. 8) On the other hand, when the forced RH was held, the group of athletes had greater sweat loss per body surface area than that of non-athletes. 9) The athletes' plasma concentration of Na+ and Cl- revealed a clear decrease. 10) There was seen no significant change in the plasma concentration of K+, Mg++ and Ca++ in both groups. 11) The IVDP occurred at the RH of 2.3ℓfor athletes and more than 2.5ℓfor no-athletes.
運動前·後 靑少年의 身體構成과 尿成分 變化에 관한 硏究
鄭琮勳,朴哲浩,朴相甲 東亞大學校附設스포츠科學硏究所 1987 스포츠科學硏究論文集 Vol.5 No.-
As the subjects of this study, 5 non athletes, 5 Obesity Student, 5 hand ball players were among the high school boys to evaluate physical fitness. The biochemistric changes of urine were observed ofter maxexercise load by Bicycle Ergometer. The conclusition obtained is as follows; 1. Before exercise, % fat was measured 18.5 ±3.97 in non athletes, 42.9 ±2.2 in obesity student and 17.4 ±1.69% in hand ball players. 2. After exercise, urine protein was significantly increased by 1.48mg/dl (36.59%: P<0.05) in non athletes, 0.60mg/dl (46.23%: P<0.02) in Obesity student, and 1.57mg/dl (48.91%: P<0.05) in hand ball players. 3. And Urine acid was significantly increased by 17.84mg/dl (18.43%: P<0.02) in nonathletes, 23.43mg/dl (26.82%: P<0.01) in obesity student, and 9.15mg/dl (7.53%: P<0.02) in hand ball players. 4. Urine nitrogen was significantly increased by 194.4mg/dl (33.71%: P<0.001) in nonathletes, 168.00mg/dl (17.42: P<0.001) in obesity student, and 213.60mg/dl (24.92%: P<0.05) in handball players. 5. Urine creatinine was significantly increased by 15.58mg/dl (41.12%: P<0.001) in nonathletes, 72.91mg/dl (35.83%: P<0.02) in obesity student, and 43.07mg/dl in hand ball players. 6. Urine specific gaovity was increased by 0.5mg/dl (0.49%: P<0.005) in nonathletes, 0.004mg/dl (0.35%: P<0.001) in obesity student, 0.003mg/dl (0.25%: P<0.01) in hand ball players.
서용진,신희갑,이철인,장의구 중앙대학교 기술과학연구소 1994 기술과학연구소 논문집 Vol.24 No.-
In the manufacturing of VLSI circuits, variations of device characteristics due to the slight differences in process parameters drastically aggravate the performances of fabricated devices. Therefore, it is very important to establish optimal process conditions in order to minimize device sensitivities. In this paper, we used one-dimensional process simulator, SUPREM-Ⅱ, and two-dimensional device simulator, MINIMOS 4.0 in order to extract optimal process parameter which can minimize changes of the device characteristics caused by process parameter variation in the case of short channel nMOSFET and pMOSFET device. From this simulation, we have derived the dependence relationship between process parameters and device characteristics. Here, we have presented a method to extract process parameters from design trend curve(DTC)obtained by process and device simulations.
관개수질을 고려한 시비가 벼의 생산성과 농업환경에 미치는 영향
엄미정,박현철,김갑철,류정,최정식 한국환경농학회 2004 한국환경농학회지 Vol.23 No.1
관개수 수질을 고려한 감비가 벼의 생산성과 농업환경에 미치는 영향을 분석한 결과는 다음 과 같다. 시험에 사용된 관개수의 질소, 인, 칼륨의 평균함량은 각각 6.16, 0.26, 9.37 ㎎/L 이 었고, 유입된 영양염류가 논을 통과하면서 농도가 감소되어 유출수의 성분은 유입된 관개수 보다는 낮은 농도를 보였으며, 논 표면수와 침출수의 농도는 시비량과 시비시기에 따라 변 화하였다. 토양검정 50% 시비구에서는 질소의 공급량과 소비량간의 차이가 0.14㎏/ha으로 나타나 양분수지면에서 균형을 이룬 반면, 농가관행시비구에서는 그 차이가 95.3㎏/ha로 나 타났다. 농가관행시비구에 비해 토양검정시비구와 토양검정50% 시비구는 등숙률, 천립중, 도정특성, 등이 우수하여 완전미수량에서 큰 차이를 보이지 않았으며, 시비량이 적을수록 단 백질 함량이 또한 적어 기계적인 식미치가 높게 나타나 품질에서 우수하였다. 시비효율에서 는 토양검정50% 처리에서 시비된 성분이 수량에 기여하는 비율이 높아서 시비이용과 효율 면에서 우수한 결과를 보였다. 이상과 같이, 관개수에 포함된 영양물질을 작물의 생육에 이 용함으로서, 농업용수의 수자원 이용효율을 높이는 동시에, 비료 절감효과와 생산량 증대의 가능성을 검토할 수 있었다. Table 11.Physicochemical properities and paratability of milled rice in the different fertilization ▷표삽입◁ (원문을 참조하세요) This study was conducted to investigate the effect on agricultural environment and crop productivity by different amount of applied fertilizer in consideration of irrigation water quality. N, P and K contents of irrigation water used in this eqdment were 6.16, 0.26 and 9.37 ㎎/L, reqecthly. N, P and K Concentrations of runoff water were lower than those of inflow water during rice cultivation. N, P and K Concentrations of ponded and percolated water were changed according to the amount and time of applied fertilization. During rice cultivation in paddy soil, nitrogen balance was closed to 0 in STF 50% (50% level of sail testing fertilizaton), 0.14 ㎏/ha, but it was 95.3 ㎏/ha in CF (conventional fertilization) treatment in STF 50% and STF (sail testing fertilization) treatment, yield of perfect rice was not greatly different as compared with CF treatment, due to the superiority of ripening rate, 1,000 grains weight and milling characteristics. Mechanical paratability of rice was excellent in NF (non fertilization) treatment, STF 50% treatment showed higher in nutrient availabiilty and fertilizers use efficiency than other treatments.