• Journal of Chest Surgery
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• 제29권10호
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• pp.1055-1065
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• 1996

혈관확장의 기전으로 혈류를 증가시킨다고 보고된 nitric oxide(이하 NO), Isosorbide dinitrate(이하 ISDW), 그리고 sodium nitroprusside(이하 SWP)에 대해 어떤 물질이 허혈성 심근에서 더 효과적인지를 알아보기 위해 이 실험을 시행하였다. 그리고 실험군은 정상대조군(1군), WO군(2군), ISDW군(3군), SWP군(4군)으로 나누었다. 실험 대상은 쥐의 심근을 채택하였으며, 실험 모델은 isolated constant pressure Langendorfr system을 채택하였다. 그리고 효과를 비교하기 위해서 냉동 심근과 관혈류내의 lactate와 CK-MB수치, 관혈류량, LVDP, dp/dt등을 측정하였다. 결과는 12군과 4군에서 허혈전 상태에서의 lactate치가 낮았다(p<0.0025). 2. 반면에 관혈류량은 2군과 4군에서 높았다. 3. 허혈전과 허 혈후에 생산된 lactate수치의 비는 2군과 4군에서 낮았다(p< 0.005). 4.관혈류내의 CK-MB치는 2군과 3군에서 낮았으며,냉동 심장내의 CK-MB치는 2군과4군에서 낮았 다. 5. 관혈류량은 전 실험 과정 에서 2군과 4군에서 높았다(p<0.005) 6. 허혈전 상태 에서의 LWP는 2군에서 가장 높았다. 7. +maximal dp/dt는 2군에서 가장 높았다. 8. 허혈전과 재\ulcorner류후의 회복률은 1군이 가장 높았다. 9. (-dp/dt)1(+dp/dt)의 비는 각군에서 각각 116%, 100%, 100%, 55%였다. 0. total dp/dt의 회복률은 각각 34%, 67%, 51%, 76%였다 결론적으로 nitric oxide는 관상혈관의 확장에 상당한 효과가 있는것으로 생각되며, lactate와 CK-MB 의 생산은 NO 군과 ISDW군에서 효과적으로 낮았다.

• 아동학회지
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• 제26권3호
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• pp.141-161
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• 2005

The 612 4th- and 6th-grade subjects completed a self-administered questionnaire. Data were analyzed by t-test one- and two-way ANOVA, Pearson's r, and multiple regression analysis. Perceived mother's emotional abuse and neglect predicted child's depressive tendencies(DT). Abusive mothers were hostile and showed lack of concern for children's safety. Male children reported more neglect by mothers than female children. Younger mothers were more abusive. Higher maternal education was negatively related to neglect and positively related to lower DT. Mother's having a job was positively related to neglect. Mother's emotional abuse and neglect was the greatest predictor of child's self-regulation; children who experienced more emotional abuse had lower self-regulation capacity and higher DT. Self-regulation of male children was positively while that of female children was negatively correlated with age.

• 대한치과기공학회지
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• 제26권1호
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• pp.59-67
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• 2004

The purpose of this study was to research the recognition of Korean Dental Technicians in Busan region about retitle of the name of 'Dental Technician'(DT), then to figure out the reality of retitle of the name(DT), so to provide data for whole country survey and to drive of the retitle of DT by Korea Dental Technicians Association. For these purpose, 250 subjects were sampled out of dental technicians in Busan, and the survey was performed with self-administered questionnaire. Out of all collected questionnaires, 192 pieces(76.8%) were addressed for this study. 1) Their desires on changing of the name(DT), 57.4%(74/129) was agreed. 2) If they could change the name(DT), they hope 3 main new names and the others, Dental Lab Art Technician(39.2%), Certified Dental Technician(23.0%), Dental Prosthetic Technician(23.0%), the others(14.8%).

• 한국방사선학회논문지
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• 제14권4호
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• pp.477-486
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• 2020

본 연구는 디지털 단층영상합성장치에서 재구성 필터, X-선원 이동궤적 및 이동간격이 화질에 미치는 영향을 평가하고 임상적 검증을 수행하는 것을 목적으로 한다. 필터링후역투영법 재구성 시 Ramp, Shepp-Logan, Cosine, Hamming, Hann 및 Blackman 필터를 사용하였고, X-선원 이동궤적의 변화를 위해 1 × 36, 2 × 18, 3 × 12, 4 × 9 및 6 × 6 배열 형태의 이동궤적을 모사하였다. X-선원 이동간격에 따른 영향을 평가하기 위해 X-선원간 거리를 5, 10, 20, 30 및 40 mm로 변화시켰다. 재구성 영상의 깊이분해능, 공간분해능 및 잡음을 평가하기 위해 인공물확산함수, 반치폭 및 신호대잡음비를 측정하였다. 연구결과 Ramp 및 Blackman 필터를 사용하였을 때 각각 공간분해능 및 잡음 특성이 최대화 되었으며, X-선원 이동궤적의 형태가 1 × 36일 때 깊이분해능과 잡음 특성이 가장 우수하였다. 또한 X-선원 이동간격이 증가함에 따라 깊이분해능 및 잡음 특성은 향상되었고, 공간분해능은 저하되었다. 따라서 디지털 단층영상합성장치를 통한 3차원 영상획득 시 재구성 필터, X-선원 이동궤적 및 이동간격이 화질에 미치는 영향은 각기 다르며, 진단 목적에 부합하는 조건 설정이 필요하다.

• International Journal of Quality Innovation
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• 제4권1호
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• pp.40-45
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• 2003

A new term Data Technology (DT) is defined, and its roles in modern technology are explained. Next, knowledge-based Six Sigma (KBSS) is proposed, and how the methodologies how it can be implemented in industry are suggested. Also the relationship between DT and KBSS Is commented.

• 한국임상수의학회지
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• 제18권4호
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• pp.402-410
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• 2001

This study was performed to investigate the hemodynamic changes which occur after occlusion of coronary artery and relation to reperfusion arrhythmias(RA) which occur when occlusion materials were removed form coronary artery in dogs. The occlusion of coronary artery was designed by temporary ligation of left circumflex branch of coronary artery during 30 minutes in 16 dogs. During occlusion of coronary artery, cardiac output(CO), mean aortic pressure (mAP), aortic systolic pressure(ASP), aortic diastolic pressure(ADP). left ventricular systolic pressure(LVSP), left ventricular maximum dp/dt (LV max. dp/dt) and left ventricular end-diastolic pressure (LVEDP) were measured. The occurrence of RA were observed for 5 minute after reperfusion by explained of ligation. As a results, cardiac arrest occurred in 4 dogs during occlusion of coronary artery, and RA was not observed in 5 dogs while it was seen in 5 dogs when explained ligation(reperfusion) after 30 minutes, the rest 2 dogs occurred temporary tachycardia. In hemodynamics changes, LVSP decreased by 10.9% and LV max. dp/dt by 5.4 % in comparison to control value which not ligated coronary artery, and LVEDP increased by 73.3%. The CO/min and mAP also decreased by 10.7% and by 11.3% expectedly. In the relationship to occurrence RA and hemodynamics changes, the LVSP and LV max. dp/dt at the time of occlusion in the RA group decreased by 11.9% and 0.8% in comarison to the control value while the decrease was 7.7% and 10% in the non-RA group. But the LVEDP in creased by 109.1% in the RA group while the decreased was 44.6% in the non-RA group. Referring CO/min, the drop was 8.8% in the RA occurrence group and 12.9% in the non-occurence group. These parameters of LVEDP, LV max. dp/dt, and CO were significant difference(p<0.05). The mAP also decreased by 11.9 in the RA group and by 9.8% in the non-RA group, but these defference were not the significant difference.

• 한국통신학회논문지
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• 제33권9C호
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• pp.669-675
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• 2008

홀수인 소수 p와 n=4k, 그리고 $d=((p^2k+1)/2)^2$에 대해서, 주기가 $p^n-1$인 p-진 m-수열 s(t)에 대해서 $(p^{2k}+1)/2$개의 서로 다른 decimated 수열들 s(dt+1), $0{\leq}l<(p^{2k}+1)/2$가 존재한다. 이 논문에서는 s(t)와 s(dt+l), $0{\leq}l<(p^{2k}+1)/2$ 사이의 상호상관 값이 $\{-1,-1{\pm}\sqrt{p^n},-1+2\sqrt{p^n}\}$과 같음을 보이고, 상호 상관 값의 분포를 유도하였다.

• 호남수학학술지
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• 제26권2호
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• pp.237-246
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• 2004

In this paper, three kinds of minimal digital pseudotori $DT_6$, $DT^{\prime}_{18}$, $DT^{{\prime}{\prime}}_{26}$, which are derived from the minimal simple 4- and 8-curves, $MSC_4$ and $MSC^{\prime}_8$, are shown and are proved not to be digitally ${\kappa}$-homotopy equivalent to each other, where ${\kappa}{\in}\{6,\;18,\;26\}$. Furthermore, the digital topological properties of the minimal digital ${\kappa}$-pseudotori are investigated in the digital homotopical point of view, where ${\kappa}{\in}\{6,\;18,\;26\}$.

• 한국멀티미디어학회논문지
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• 제21권4호
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• pp.478-484
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• 2018

The choice of the motion features influences the result of the human action recognition method directly. Many factors often influence the single feature differently, such as appearance of the human body, environment and video camera. So the accuracy of action recognition is restricted. On the bases of studying the representation and recognition of human actions, and giving fully consideration to the advantages and disadvantages of different features, the Dense Trajectories(DT) algorithm is a very classic algorithm in the field of behavior recognition feature extraction, but there are some defects in the use of optical flow images. In this paper, we will use the improved Dense Trajectories(iDT) algorithm to optimize and extract the optical flow features in the movement of human action, then we will combined with Support Vector Machine methods to identify human behavior, and use the image in the KTH database for training and testing.

• 천문학회보
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• 제46권2호
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• pp.52.4-52.4
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• 2021

The 7-dimensional Telescope (7DT) is an innovative multiple telescope system that can perform a rapid identification of optical counterparts of gravitational-wave (GW) sources and a wide variety of other astronomical projects. This telescope is being developed as a part of the recently approved National Challenge program, the GW Universe project, with a full operation planned at the end of 2023. The word 7-dimension stands for x, y, z positions, the radial velocity, the time, the wavelength, and the flux of astronomical sources, implying the telescope's capability of performing time-series wide-field, IFU-type spectroscopic observations. The 7DT is composed of about twenty 0.5-m wide-field telescopes, and it can obtain spectral-imaging data at 40 different wavelengths to the depth of 20 AB mag with 3 min exposure for a given epoch. In this talk, we will introduce the telescope system, and outline its scientific capabilities with an emphasis on multi-messenger astronomy and a few other key science topics.