• Proceedings of the Korea Society for Simulation Conference
• /
• 1999.10a
• /
• pp.289-293
• /
• 1999

디지털 기술을 기반으로 한 조속기 제어시스템의 제어 알고리즘에 대한 적합성과 하드웨어의 신뢰성 시험을 위한 다이나믹 테스트 베드를 구축하기 위해 증기 터빈 및 발전기의 특성을 그대로 모사하는 시뮬레이터 및 하드웨어를 개발하였으며, 개발된 시뮬레이터를 사용자(시험자)가 그 기능들을 적절하고 편리하게 사용할 수 있도록 인간공학의 원칙을 반영하여 설계하였다. 이를 위해 시뮬레이터가 가져야 하는 기능들을 시험 절차의 분석을 통해 도출하고 그 기능들을 사용 목적에 따라 적절하게 그룹핑하였으며, 가장 빈번하게 사용하는 Mimic Display의 경우 사용자가 항상 확인 가능하도록 주 화면에 구성한 인간-기계 연계 설계에 대해 소개하고자 한다.

• Bulletin of the Korean Chemical Society
• /
• v.17 no.9
• /
• pp.831-835
• /
• 1996

New dynemicin A mimics with methyl group 2a and 2b were synthesized, and acid-induced hydrolyzed to see an electronic effect of substituent for epoxide opening. The model 2a with methyl group at C3 position was more rapidly transformed to diol 16a than 2b with methyl group at C2. This result suggests that any substituent at C3 position plays more important role than any substituent at C2 position in the dynemicin A mimic activation.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.05d
• /
• pp.1093-1098
• /
• 2002

본 연구실에서 개발한 MIMIC(Motion Interface & Motion Information Capture system)은 동작자의 동작을 획득하고, 동작의 의미를 이해할 수 있도록 설계된 시스템이다. 비전 센서로부터 입력된 영상을 분석하여 동작자의 머리와 두 손, 두 발의 정보를 찾는다. 그리고, 이 정보를 기반으로 팔꿈치나 무릎 등의 중간 관절을 추정한 후 20개의 관절을 가지는 3차원 인체 모델을 구성한다. 이 인체 모델은 동작자의 동작을 실시간으로 흉내낸다. 그러므로, 기존의 마커프리 모션캡쳐 시스템과 달리 완벽한 인체를 구성하기 위한 중간 관절까지 생성함으로써 동작자의 동작을 더욱 자연스럽게 구현할 수 있다.

• Journal of the Korean Society for Precision Engineering
• /
• v.26 no.11
• /
• pp.29-34
• /
• 2009

• Annals of Clinical Neurophysiology
• /
• v.7 no.1
• /
• pp.63-64
• /
• 2005

• Proceedings of the Korea Information Processing Society Conference
• /
• 2021.05a
• /
• pp.514-516
• /
• 2021

본 연구는 심혈관계 질환 진단에 주고 사용되는 PTT 를 계산할 때 필요한 PPG 신호가 없을 경우 ECG 신호만을 사용하여 PTT 값을 예측하는 방법을 제안한다. MIMIC-I 데이터셋에서 2 채널 심전도 데이터와 광전용적맥파 데이터를 확보하여 제안하는 방법을 적용하였을 때, RMSE 0.07116 으로 예측하였다. 본 연구는 향후 단일 생체신호만 측정할 수 있는 제한된 상황에서 대안으로 활용될 수 있을 것이다.

• Journal of the Korean Society of Industry Convergence
• /
• v.25 no.3
• /
• pp.443-449
• /
• 2022

In this study, in order to improve the disadvantages of the environmental error of the infusion set that performs infusion therapy in the existing clinical practice and to maximize the user's convenience by miniaturizing the existing infusion pump system, the structure of the muscle pump of the human vein was imitated. As a double check valve method, a method for preventing the backflow of fluid and discharging a constant fluid in one direction by external pressure was proposed. The proposed bio-mimic muscle pump uses a check valve that controls the flow of fluid in one direction and a silicone tube with elasticity, and a chamber is constructed. A peristaltic pump for applying intermittent pressure to the tube chamber was constructed using a multi-cam structure roller. In order to verify the performance of the proposed pump, optimization was performed while changing the number of multi-cam rollers and adjusting the speed of the roller driving motor, and the reproducibility of the instantaneous discharge amount and the continuous discharge amount of the pump was compared and tested. The performance of the muscle pump proposed in this study was verified through experiments that it can inject up to 1L of fluid within 12 hours, and that it is possible to inject the fluid with an accuracy of ±0.1ml. Real-time monitoring of the fluid injection volume through the bio-mimic muscle pump proposed in this study not only increases the convenience of the administrator, but also provides a precise fluid administration environment to more patients at a low cost, and additionally applies bubble detection and occlusion detection technology If so, it is believed that a safer medical environment can be provided to patients.

• Journal of Korea Water Resources Association
• /
• v.45 no.6
• /
• pp.531-544
• /
• 2012

This study suggested the parameter estimation method for given rainfall events to be properly expressed by the beta distribution. For this purpose, this study compared the characteristics of probability density function with the parameter proposed considering the cases with and without addition to the rainfall peak, and the cases of using the real hyetograph and the rearranged hyetograph about the rainfall peak. As an example, this study analyzed the independent rainfall events at Seoul in 2010 and the annual maximum independent rainfall events from 1961 to 2010. The results derived are as follows. First, this study confirmed the necessity of additional consideration on rainfall peak to mimic the real hyetograph of rainfall events by the beta distribution. Second, this study confirmed the case of using rearranged hyetograph about the rainfall peak derived a better beta distribution to well mimic the characteristics of real rainfall than the case using the real hyetograph.

• Restorative Dentistry and Endodontics
• /
• v.26 no.4
• /
• pp.341-349
• /
• 2001

Dental caries is the most common oral disease. There are many factors contributing to its development, but complete understanding and prevention are not fully known. However, it is possible to remineralize the early enamel curious lesion by fluoride containing remineralization solution. Recently the pH-cycling model has been used to examine the effect of fluoride solution on remineralization of artificial caries in vitro as it can closely simulate the conditions encountered in vivo within a carefully controlled environment. The aim of this study was to evaluate the remineralizing effects of supersaturated buffer solutions under pH-cycling model. The specimen with 3mm-diameter was made using mature bovine incisors which has no caries and has sound enamel surface. Early curious lesions were produced by suspending each specimens into demineralization solution at pH 5.0 for 33 hours and the specimen whose surface hardness value ranged from 25 to 45 VHN were used. The pH cycling treatment regimen consisted of 5 min soaks of three treatment solutions four times per days for 15 days and the continuous cycling of demineralization and remineralization were carried out for 15 days. Following the pH-cycling treatment regimen, the specimens' surface microhardness were measured by the Vickers hardness test (VHN) and analyzed by ANOVA and Duncan's multiple-range test. 1. The surface microhardness value of supersaturated solution, Senstime, and Gagline groups were increased after pH cycling, and that of supersaturated solution was significantly Increased compared to saline group(P<0.05). 2. The surface remineralization effect of fluoride containing solutions was accelerated by saliva under pH-cycling mode 3. The pH cycling model was considered appropriate to mimic the intra-oral pH changes when evaluating demineralization and remineralization in vitro. Under the results of above study, salivary remineralization effect can be improved by fluoride containing remineralization solution. The pH-cycling model was considered appropriate to mimic the intra-oral pH changes when evaluating demineralization and remineralization in vitro.

• Journal of Information Technology Services
• /
• v.11 no.4
• /
• pp.135-151
• /
• 2012

Traditionally in IS studies, the relationship between construct and its measurement items tends to be assumed to be reflective, meaning that the measurements are a reflection of the construct. In reality, however, the nature of the construct can be often formative, which means that its measurement items describe and define the construct rather than vice versa. The purpose of this study was to investigate theoretical and empirically-analysed differences between formative construct and reflective construct through comprehensive interdisciplinary literature review. And then on the basis of these differences, we intended to derive the rule of specifying whether the construct is formative or reflective and propose the methodology of testing the validity(content validity, construct validity, internal consistency and external construct) of formative construct and its measurements, differentiated from that in the case of reflective construct. Also, we suggested the concrete statistical testing methods such as VTT(Vanishing Tetrad Test), MIMIC(Multiple Indicators and Multiple Causes) test and multi-collinearity test. In order to examine the applicability of this methodology to developing the constructs for performance evaluation of IS(Information Systems), we tried to identify its attribute(formative or reflective) and test the validity for the construct arbitrarily chosen among them which had been derived in our previous IS performance evaluation study by using this methodology. The result of the examination was that the methodology proposed in this study was significantly valid and effective in the area of IS performance evaluation.