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박혜숙,박기양,김영국,박규홍,박윤범,권혁천,박노경,백은정,황정연 한국수학교육학회 2004 수학교육 Vol.43 No.2
In this paper, we verified the effect and appropriateness of the scheme to cure the math. disliking disposition which is the cause of underachievement in learning. We choose 3 schools as the subject of experiment for this research. Each experiment experiment class consists of 27~30 students(underachievers) whose final test results of 1st school year in the middle school are 30~60 points. In this case, we also select some middle level students whose test results are more than 60 points for the normal experimental condition. For this research, we developed the suitable test materials to cure the mathematics disliking disposition of underachievers. We applied those test materials to the experiment schools during 2.5 months and we analysed the variation of disliking disposition, the variation of math. dislike students' number and the cure rate of the math. disliking disposition. From the results of this experimental study, we find that the factors of teacher and math recognition environment have only the significant difference of math. disliking disposition between experiment class and comparison class under the 5% significance level in one middle school. We understand that this results caused by teachers' careful advice and guidance in that middle school. We also find that the number of student who dislike mathematics decreased in two middle schools. Furthermore 50% of math. disliking dispositions are cured for 9 disliking factors in the lower grade group(the group of underachievers) and as a whole, we can see that 50% of cure rate for the 7 factors of math. disliking in two middle schools. So we can understand that the experiment of our research was performed successfully in two middle schools. In this research, we find out that the scheme to cure the disliking dispositions for the factors of math. disliking depends on the factors of teacher who take charge of cure. So teachers must take interest in and must have careful concem to students and their math. disliking.
Benefits and problems in implementation for integrated medical Information system
Park, Chang-Seo,Kim, Kee-Deog,Park, Hyok,Jeong, Ho-Gul 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4
Purpose : Once the decision has been made to adopt an integrated medical information system (IMIS), there are a number of issues to overcome. Users need to be aware of the impact the change will make on end users and be prepared to address issues that arise before they become problems. The purpose of this study is to investigate the benefits and unexpected problems encountered in the implementation of IMIS and to determine a useful framework for IMIS. Materials and Methods : The Yonsei University Dental Hospital is steadily constructing an IMIS. The vendor's PACS software, Piview STAR, supports transactions between workstations that are approved to integrating the healthcare enterprise (IHE) with security function. It is necessary to develop an excellent framework that is good for the patient, healthcare provider and information system vendors, in an expert, efficient, and cost-effective manner. Results : The problems encountered with IMIS implementation were high initial investments, delay of EMR enforcement, underdevelopment of digital radiographic appliances and software and insufficient educational training for users. Conclusions : The clinical environments of dental IMIS is some different from the medical situation. The best way to overcome these differences is to establish a gold standard of dental IMIS integration, which estimates the cost payback. The IHE and its technical framework are good for the patient, the healthcare provider and all information systems vendors.
구내 표준 방사선사진을 이용한 구내방사선촬영기의 선질 평가
이상섭,권혁락,심우현,오승현,이지연,전국진,김기덕,박창서 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.3
Purpose : This study was to evaluate the beam quality of intraoral X-ray equipments used at Yonsei University Dental Hospital (YUDH) using the half value layer (HVL) and the characteristic curve of intraoral standard X-ray film. Materials and Methods : The study was done using the intraoral X-ray equipments used at each clinical department at YUDH. Aluminum filter was used to determine the HVL. Intraoral standard film was used to get the characteristic curve of each intraoral X-ray equipment. Results : Most of the HVLs of intraoral X-ray equipments were higher than the least recommended thickness, but the REX 601 model used at the operative dentistry department and the X-707 model used at the pediatric dentistry department had HVLs lower than the recommended thickness. The slopes of the characteristic curves of films taken using the PANPAS 601 model and REX 601 model at operative dentistry department, the X-705 model of prosthodontic dentistry department, and the REX601 model at the student clinic were relatively low. Conclusion : HVL and the characteristic curve of X-ray film can be used to evaluate the beam quality of intraoral X-ray equipment. In order to get the best X-ray films with the least radiation exposure to patients and best diagnostic information in clinical dentistry, X-ray equipment should be managed in the planned and organized fashion. (Korean J Oral Maxillofac Radiol 2000; 30: 183-188)
Park, Eunkuk,Kim, Jeonghyun,Kim, Mun-Chang,Yeo, Subin,Kim, Jieun,Park, Seulbi,Jo, Miran,Choi, Chun Whan,Jin, Hyun-Seok,Lee, Sang Woo,Li, Wan Yi,Lee, Ji-Won,Park, Jin-Hyok,Huh, Dam,Jeong, Seon-Yong MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.11
<P>Osteoporosis is an abnormal bone remodeling condition characterized by decreased bone density, which leads to high risks of fracture. Previous study has demonstrated that Lycii Radicis Cortex (LRC) extract inhibits bone loss in ovariectomized (OVX) mice by enhancing osteoblast differentiation. A bioactive compound, kukoamine B (KB), was identified from fractionation of an LRC extract as a candidate component responsible for an anti-osteoporotic effect. This study investigated the anti-osteoporotic effects of KB using in vitro and in vivo osteoporosis models. KB treatment significantly increased the osteoblastic differentiation and mineralized nodule formation of osteoblastic MC3T3-E1 cells, while it significantly decreased the osteoclast differentiation of primary-cultured monocytes derived from mouse bone marrow. The effects of KB on osteoblastic and osteoclastic differentiations under more physiological conditions were also examined. In the co-culture of MC3T3-E1 cells and monocytes, KB promoted osteoblast differentiation but did not affect osteoclast differentiation. In vivo experiments revealed that KB significantly inhibited OVX-induced bone mineral density loss and restored the impaired bone structural properties in osteoporosis model mice. These results suggest that KB may be a potential therapeutic candidate for the treatment of osteoporosis.</P>
Comparison of the Priming Effects of Vecuronium and d-Tubocurarine in Rabbits
Park, Cheol Joo,Suh, Jae Hyun,Kim, Sung Nyeun,Shim, Jae Yong,Park, Chong Min,Kwon, Ou Kyong,Chung, Woon Hyok CATHOLIC MEDICAL CENTER 1986 Bulletin of the Clinical Research Institute Vol.14 No.1
This study was performed to compare the priming effects of vecuronium and d-tubocurarine. The priming effects were evaluated by using the TOF response of the common peroneal nerveanterior tibialis muscle preparation in rabbits. The onset time of maximal blockade and recovery indices of the priming groups in which drugs were injected in divided doses are faster than control groups in which drugs were injected in single dose. The dosage requiring for complete block was reduced in the priming groups.
Characteristics of a new cone beam computed tomography
Park, Chang-Seo,Kim, Kee-Deog,Park, Hyok,Jeong, Ho-Gul,Lee, Sang-Chul 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.4
Purpose : To determine the physical properties of a newly developed cone beam computed tomography (CBCT). Materials and Methods : We measured and compared the imaging properties for the indirect-type flat panel detector (FPD) of a new CBCT and the single detector array (SDA) of conventional helical CT (CHCT). Results : First, the modulation transfer function (MTF) of the CBCT were superior to those of the CHCT. Second, the noise power spectrum (NPS) of the CBCT were worse than those of the CHCT. Third, detective quantum efficiency (DQE) of the indirect-type CBCT were worse than those of the CHCT at lower spatial frequencies, but were better at higher spatial frequencies. Although the comparison of contrast-to-noise ratio (CNR) was estimated in the limited range of tube current, CNR of CBCT were worse than those of CHCT. Conclusion : This study shows that the indirect-type FPD system may be useful as a CBCT detector because of high resolution.
Park, Jin Sup,Cha, Kwang Soo,Lee, Dae Sung,Shin, Donghun,Lee, Hye Won,Oh, Jun-Hyok,Kim, Jeong Su,Choi, Jung Hyun,Park, Yong Hyun,Lee, Han Cheol,Kim, June Hong,Chun, Kook-Jin,Hong, Taek Jong,Jeong, Myu BMJ Publishing Group Ltd 2015 Heart Vol.101 No.15
<P><B>Objective</B></P><P>The value of multivessel revascularisation in cardiogenic shock and multivessel disease (MVD) is still not clear. We compared outcomes following culprit vessel or multivessel revascularisation in patients with ST-elevation myocardial infarction (STEMI), cardiogenic shock and MVD.</P><P><B>Methods</B></P><P>From 16 620 patients with STEMI who underwent primary percutaneous coronary intervention (PCI) in a nationwide, prospective, multicentre registry between January 2006 and December 2012, 510 eligible patients were selected and divided into culprit vessel revascularisation (n=386, 75.7%) and multivessel revascularisation (n=124, 24.3%) groups. The primary outcomes were inhospital mortality and all-cause death during a median 194-day follow-up. A weighted Cox regression model was constructed to determine the HRs and 95% CIs for outcomes in the two groups.</P><P><B>Results</B></P><P>Compared with culprit vessel revascularisation, multivessel revascularisation had a significantly lower adjusted risk of inhospital mortality (9.3% vs 2.4%, HR 0.263, 95% CI 0.149 to 0.462, p<0.001) and all-cause death (13.1% vs 4.8%, HR 0.400, 95% CI 0.264 to 0.606, p<0.001), mainly because of fewer cardiac deaths (9.7% vs 4.8%, HR 0.510, 95% CI 0.329 to 0.790, p=0.002). In addition, multivessel revascularisation significantly decreased the adjusted risk of the composite endpoint of all-cause death, recurrent myocardial infarction and any revascularisation (20.3% vs 18.1%, HR 0.728, 95% CI 0.55 to 0.965, p=0.026).</P><P><B>Conclusions</B></P><P>This study showed that, compared with culprit vessel revascularisation, multivessel revascularisation at the time of primary PCI was associated with better outcomes in patients with STEMI with cardiogenic shock. Our results support the current guidelines regarding revascularisation in these patients.</P>
NOTE ON THREE OF RAMANUJAN'S THEOREMS
Park, In-Hyok,Seo, Tae-Young Korean Mathematical Society 2000 대한수학회논문집 Vol.15 No.1
The object of this note is to introduce three Ramanuian's formulae of similar nature among his many curious ones and to prove them by making use of the theory of generalized hypergeometric series.