• The Bulletin of The Korean Astronomical Society
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• v.44 no.2
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• pp.46.1-46.1
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• 2019

우리나라 최초의 우주탐사 사업인 달 탐사선(KPLO) 개발 사업에는 국내에서 개발하는 과학 탑재체 3기, 기술 검증탑재체 1기, 고해상도 카메라 1기, 국제협력의 일환으로 NASA의 과학 탑재체 1기도 함께 개발되고 있다. KPLO와 이들 탑재체의 운영을 수행하게 될 KPLO 심우주 지상시스템은 달 탐사선 운영에 필요한 궤도, 임무계획 등의 정보를 생성하고, KPLO의 기동명령과 상태정보를 송, 수신하는 역할을 주요 임무로 수행한다. 또한 이들 정보를 기반으로 궤도임무를 수행하고 있는 KPLO의 임무운영 상태를 시각화하여 운영자로 하여금 KPLO 운영을 용이하게 하고, 공공에게 이를 제공하는 역할도 함께 수행한다. KPLO 심우주 지상시스템은 AGI사의 STK와 NASA/JPL에서 개발한 Cosmographia를 활용하여 각각 특성에 맞는 KPLO 운영 시각화 정보를 제공할 것이다. 본 발표에서는 Cosmographia의 작동 및 활용 개념을 설명하고, KPLO의 가상 임무를 적용한 SPICE Kernels을 활용하여 고해상도 카메라인 LUTI의 지향, 달 중심 표준좌표를 적용한 KPLO의 궤도 등을 시각화 시연을 한다. 또한 고해상도 달 표면 영상 적용, 심우주 네트워크 안테나의 위치 정보표출 등 Cosmographia에서 기본적으로 제공하던 시각화 정보를 개선한 내용에 대해서도 함께 시연한다.

• Journal of the Korean Society of Radiology
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• v.13 no.2
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• pp.201-207
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• 2019

This study has evaluated whether the method of using the combination of different risk group, according to K-TIRADS classification and K-TIRADS classification in thyroid ultrasonography is useful in a differential diagnosis of benign and malignant nodules. The subject was patients underwent thyroid ultrasonography and retrospective analysis were performed based on the results of fine needle aspiration cytology. A chi-square test was performed for the difference analysis of the score system in K-TIRADS and different risk group according to the benign and malignant of thyroid nodule. The optimized cut off value was determined by the K-TIRADS score and different risk group to predict malignant nodule through ROC curve analysis. In the differential verification result of K-TIRADS and different risk group, according to the classification of benign and malignant nodule group each showed significant difference statistically(p=.001). In the point classification according to K-TIRADS for the prediction of benign and malignant in ROC curve analysis showed AUC 0.786, Cut-off value>2(p=.001), and in the different risk group, it was decided as AUC 0.640, Cut-off value>2(p=.001). When discovering the nodule in thyroid ultrasound, it is considered that the K-TIRADAS which helps in identifying benign and malignant thyroid nodules, it is considered to be helpful in the differential diagnosis of thyroid nodules, than the classification system according to Different risk group, and when applying the classification system according to K-TIRADS, it is considered that it can reduce unnecessary fine needle aspiration cytology and could be helpful in finding the malignant nodules early.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.1
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• pp.7-15
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• 2002

This paper is concerned with remote environment monitoring & control for the breeding house as scattering far and wide. The environment data is detected in the breeding house that is collected to one processor. It's adapted to the PSTN(public switch tele-phone network) and multi-processing for exchange the environment data and the control data in between the manager and a breeding house by micro-processor. We have designed the algorithm of the communication sequence through the experimental research. This system is composed of sensor interface, FSK communications, LED display, data latch and MCS-51 single-chip. The S/W is composed with data acquisition by multi-processing, data communication and interrupt. And this paper is Proposed the DB structure algorithm concern to a mount scale using web design. The subject is a performance of effective management for the breeding house.

• Journal of Sensor Science and Technology
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• v.11 no.5
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• pp.273-278
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• 2002

An intrusion-sensitive capability of multimode graded-index (GRIN) optical fibers under bending has been investigated. In this system, the data light is transmitted in the fundamental mode while alarm monitor light is launched in a high-order mode at the same time. An attempted intrusion to drain data by bending the fiber results in greater attenuation of a monitor signal in higher order modes, thereby setting off an alarm at the receiver. Light propagation in a multimode graded-index fiber is also analyzed theoretically when the fundamental mode is selectively excited and the fiber is bent around a constant radius mandrel. The bending generates coupling between the various modes of the fiber. Power transitions of the fundamental mode by changing the bending radius were also analyzed numerically using program simulation. It is shown that Asawa-Taylor model[4] is valid up to 1cm of the radius of curvature of the fiber bend.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.5684-5688
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• 2012

This paper aims to design the leaf spring of high fatigue life which guides the moving part of the horizontal linear vibrating actuator. The vertical linear vibrating actuator has been used as the vibration device for haptic and alarm function on smart phone. However, the vibrating actuator has a major cause on the limitation to make smart phone slim because of its own characteristic of vertical direction vibration. The horizontally linear vibrating actuator for smart phone slimness has been developed in recent years. One of the most significant parts of horizontal vibrating linear actuator is the guide spring which supports moving part of actuator and enables actuator to vibrate elastically. Various types of leaf springs were designed and analyzed to get the required stiffness with high fatigue life through the stress analysis using commercial structural analysis program, ANSYS. The experiments were performed with prototypes to measure vibration acceleration and life time of leaf spring.