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최영웅,김홍백,강효민,윤상문 三陟大學校 2003 論文集 Vol.36 No.-
The purpose of this study was to investigate swimming pool usage at sports centers in Samcheok, South Korea and to identify ways of improving its operation. A survey developed by the researcher was used to collect data from a random sample of 243 participants in swimming programs at the sports centers. The internal operation data were also obtained from each sports center to analyze its operation of a swimming pool. 1. Of the 243 participants, 69% indicated that improving physical health was considered the most common reason for which they participated in the swimming program. Seventeen percent reported that utilizing their leisure time was the reason for them to start swimming. Seventeen percent of the respondents were influenced by their friends to begin swimming while 47% decided to begin swimming without other' s influence. 2. Fifty-three percent of male respondents (53%) used a swimming pool early morning and 27% used it later afternoon. On the other hand, 66% of female respondents used it in the morning and 22% used it in the early morning. The majority of the female respondents indicated their duration of using it was two years or more, while the majority of the male reported their duration was three to six months. 3. Most respondents (63%) spent less than 30 minutes to get to their sports center by an automobile. Fifty-three percent drove their car and 40% used a transportation provided by their sports center. 4. More than 78% were satisfied with their swimming instructor. Fifty-one percent were specially satisfied with her/his service and 21% were satisfied with her/his coaching skills. 5. Fifty-four percent were satisfied with its facilities while 2% were dissatisfied with it. 6. The most respondents preferred to purchase a three-month membership. Sixty-four percent were satisfied with their membership fees. 7. Only 2% indicated that they want to discontinue their swimming program. Reasons for that were a lack of time (31%) and unaffordable membership fees (27%). 8. Statistically significant differences were found in the satisfaction with its facilities between married and unmarried respondents. In addition, statistically significant differences were found in the satisfaction with its store and restaurant based on their demographical characteristics. 9. The peak season for swimming pool usage was between June and August while the slower season was between November and February. Based on the analysis of the internal operation data, there had been a loss of $54,000 for 2000 and $80,000 for 2001.
咸榮敏,趙熙俊,洪英浩,張潤鎬 단국대학교 1987 論文集 Vol.21 No.-
This study was carried out to investigate the effect of solid mass flow rate and mean particle diameter on minimun carrying velocity, which was defined as the superficial gas velocity of the upper limit of choking phenomenon, when vertical pneumatic conveying was made through a screen-packed pipe whose inner diameter and length were 4.6cm and 180cm respectively. It was also examined the effect of superficial gas velocity, solid mass flow rate and mean particle diameter on pressure drop. And these minimum carrying velocity and pressure drop were compared with those in an empty pipe. Superficial gas velocity was taken 3.0m/sed to 5.5m/sec. Solid mass flow rate was controlled by five orifices which had different opening dimensions and its range was 2.90g/sec to 16.35g/sec. Silica sand of three sizes (mean diameter; 425㎛, 280㎛, 180㎛) was used as solid particle. The pressure drop in a screen-packed pipe increased as superficial gas velocity, solid mass flow rate and mean particle diameter increased. And the pressure drop in an empty pipe also increased according to the increase of solid mass flow rate, but it decreased though superficial gas velocity increased within the range of experimental conditions. In the case of minimum carrying velocity, it increased as solid mass flow rate and mean particle diameter increased. The pressure drop in a screen-packed pipe was far higher than that in an empty pipe. However, the minimum carrying velocity in the former was slightly lower than that in the latter.
석면함유 슬레이트 지붕 물받이 퇴적물 중 석면 섬유 함유율
임지현,한솔민,김현석,신유민,박시은,허정윤,김민영,장봉기 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2
This study attempted to determine the degree of asbestos release from the aging slate roof by comparing the asbestos content in the slate roof rain gutter with a colored steel plate (tin plate) over the slate roof. Four slate roof houses located in Haengmok-ri, Asan-si, Chungcheongnam-do, and one house constructed with a colored steel plate on the slate roof were selected to collect the sediment of the roof rain gutter. The asbestos fiber content was calculated by a point counting method using a polarization microscope after pretreatment with conversion treatment and hydrochloric acid treatment. The average asbestos content of the four slate roof rain gutter were 1.89%. However, asbestos was not detected in the Slate covering roof rain gutter, which were constructed on the slate roof. Asbestos fiber content was the highest at 2.89% in the slate roof rain gutter installed in 1976, followed by 2.44% in 1953. From the above results, it is necessary to minimize secondary damage as asbestos fibers released from slate roof houses to the surrounding atmosphere or leaked from slate roofs as rainwater may cause soil pollution and seriously affect residents' health. Although covering with colored steel plates (tin plates) has been shown to prevent the leakage of asbestos fibers to some extent, it is believed that a policy alternative to remove the slate roof as soon as possible is needed to solve the fundamental problem.
Radicicol Inhibits iNOS Expression in Cytokine-Stimulated Pancreatic Beta Cells
Youn, Cha Kyung,Park, Seon Joo,Li, Mei Hong,Lee, Min Young,Lee, Kun Yeong,Cha, Man Jin,Kim, Ok Hyeun,You, Ho Jin,Chang, In Youp,Yoon, Sang Pil,Jeon, Young Jin The Korean Society of Pharmacology 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.4
Here, we show that radicicol, a fungal antibiotic, resulted in marked inhibition of inducible nitric oxide synthase (iNOS) transcription by the pancreatic beta cell line MIN6N8a in response to cytokine mixture (CM: TNF-${\alpha}$, IFN-${\gamma}$, and IL-$1{\beta}$). Treatment of MIN6N8a cells with radicicol inhibited CM-stimulated activation of NF-${\kappa}B$/Rel, which plays a critical role in iNOS transcription, in a dose-related manner. Nitrite production in the presence of PD98059, a specific inhibitor of the extracellular signal-regulated protein kinase-1 and 2 (ERK1/2) pathway, was dramatically diminished, suggesting that the ERK1/2 pathway is involved in CM-induced iNOS expression. In contrast, SB203580, a specific inhibitor of p38, had no effect on nitrite generation. Collectively, this series of experiments indicates that radicicol inhibits iNOS gene expression by blocking ERK1/2 signaling. Due to the critical role that NO release plays in mediating destruction of pancreatic beta cells, the inhibitory effects of radicicol on iNOS expression suggest that radicicol may represent a useful anti-diabetic activity.
Radicicol Inhibits iNOS Expression in Cytokine-Stimulated Pancreatic Beta Cells
Cha Kyung Youn,Seon Joo Park,Mei Hong Li,Min Young Lee,Kun Yeong Lee,Man Jin Cha,Ok Hyeun Kim,Ho Jin You,In Youp Chang,Sang Pil Yoon,Young Jin Jeon 대한생리학회-대한약리학회 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.4
Here, we show that radicicol, a fungal antibiotic, resulted in marked inhibition of inducible nitric oxide synthase (iNOS) transcription by the pancreatic beta cell line MIN6N8a in response to cytokine mixture (CM: TNF-Ձ, IFN-Ճ, and IL-1Ղ). Treatment of MIN6N8a cells with radicicol inhibited CM-stimulated activation of NF-ՊB/Rel, which plays a critical role in iNOS transcription, in a dose-related manner. Nitrite production in the presence of PD98059, a specific inhibitor of the extracellular signal-regulated protein kinase-1 and 2 (ERK1/2) pathway, was dramatically diminished, suggesting that the ERK1/2 pathway is involved in CM-induced iNOS expression. In contrast, SB203580, a specific inhibitor of p38, had no effect on nitrite generation. Collectively, this series of experiments indicates that radicicol inhibits iNOS gene expression by blocking ERK1/2 signaling. Due to the critical role that NO release plays in mediating destruction of pancreatic beta cells, the inhibitory effects of radicicol on iNOS expression suggest that radicicol may represent a useful anti-diabetic activity.
요추부 골밀도 측정 시 장내 변화가 골밀도에 미치는 영향
Yoon, Joon,Kim, Yun-Min,Lee, Hoo-Min,Lee, Jung Min,Kwon, Soon-Mu,Cho, Hyung-Wook,Kang, Yeong-Han,Kim, Boo-Soon,Kim, Jung-Soo 대한방사선과학회 2014 방사선기술과학 Vol.37 No.4
Bone density measurement use of diagnosis of osteoporosis and it is an important indicator for treatment as well as prevention. But errors in degree of precision of BMD can be occurred by status of patient, bone densitometer and radiological technologist. Therefore the author evaluated that how BMD changes according to the condition of the patient. As Lumbar region, which could lead to substantial effects on bone density by diverse factors such as the water, food, intentional bowels. We recognized a change of bone mineral density in accordance with the height of the water tank and in the presence or absence of the gas using the Aluminum Spine Phantom. We also figured out the influence of bone mineral density by increasing the water and food into a target on the volunteers. Measured bone mineral density through Aluminum Spine Phantom had statistically significant difference accordance with increasing the height of water tank(p=0.026). There was no significant difference in BMD according to the existence of the bowl gas(p=0.587). There was no significant difference in a study of six people targeted volunteers in the presence or absence of the food(p=0.812). And also there was no significant difference according to the existence of water(p=0.618). If it is not difficult to recognize the surround of bone in measuring BMD of lumbar bone, it is not the factor which has the great effect on bone mineral density whether the test is after endoscopic examination of large intestine and patient's fast or not. 골밀도는 골다공증 진단에 중요하게 이용되고 있고, 치료 및 예방에 중요한 지표가 되고 있다. 그러나 골밀도는 피검자의 상태, 골밀도 측정기, 검사자 등에 의해 정밀도의 오차가 발생할 수 있다. 골밀도에 미치는 다양한 요인 중 요추 부위에 실질적인 영향을 일으킬 수 있는 장내가스, 음식, 물을 통하여 환자의 상태에 따라 어떻게 변화하는지 알아보고자 하였다. Aluminium spine phantom(ASP)을 이용하여 수조의 물 높이 변화와 가스의 유무에 따른 골밀도의 변화를 알아보았다. 또한 자원자를 대상으로 물이 증가하거나 음식물 증가에 의한 골밀도의 영향을 알아보았다. Aluminium spine phantom을 통한 골밀도 측정에서 수조의 물 높이가 증가함에 따라 골밀도가 감소하여 통계적으로 유의한 변화를 관찰하였다(p=0.026). 가스의 유무에 따른 골밀도의 유의한 차이가 없었다(p=0.587). 자원자를 대상으로 한 연구에서는 음식물의 유무에 따른 골밀도가 유의한 차이가 없었으며(p=0.812), 물의 유무에 따라서도 골밀도의 유의한 차이가 없었다(p=0.618). 따라서 요추부 골밀도 측정에서 골의 경계를 인지하는데 어려움이 없다면, 환자의 금식여부나 대장 내시경 검사 후에 시행하는 골밀도 검사는 골밀도에 큰 영향을 끼치는 인자가 아님을 알 수 있었다.