• 대한전기학회논문지:시스템및제어부문D
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• 제52권2호
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• pp.77-84
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• 2003

This paper is concerned with level control of a upper plate in a vehicle. The objective of control is to maintain the upper plate at level regardless of road slopes. The road slope is detected using an accelerometer-type inclinometer and H infinity control method is used to simultaneously reduce effects of road slopes and sensor noises. By the simulation, it is shown that the upper plate is successfully maintained at level.

• 전기학회논문지P
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• 제58권2호
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• pp.116-121
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• 2009

Distributed power systems (DPSs) has been widely used various industrial/military applications due to their various advantages. Furthermore, the "All electric" concept, in conjunction with DC DPS, appears to be more advanced and mature in the AEV(All-Electric Vehicular) industry. Generally, AEV carry many loads with varied functions. However, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, a converter with spilt capacitors and a simple adaptive controller is proposed as a active damping device to mitigate the voltage transients on the bus. The proposed converter allows the smaller capacitive storage. In addition, the proposed control approach has the advantage of requiring only one sensor and performing both the functions of mitigating the voltage bus transients and maintaining the level of energy stored. The control algorithm has been implemented on a TMS320F2812 Digital Signal Processor (DSP). Simulation and experimental results are presented which verify the proposed control principle and demonstrate the practicality of the circuit topology.

• 대한의용생체공학회:의공학회지
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• 제44권3호
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• pp.204-210
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• 2023

This study focuses on analyzing medical device standards and regulatory requirements in the medical device industry, based on the Medical Device Act in Korea. The objective of this analysis is to determine whether the domestic standards for medical devices in Korea align with international and regional standards. Furthermore, it aims to identify the current application of domestic standards in ensuring the safety and essential performance of medical devices. The analysis revealed that out of a total of 281 domestic standards, 127 standards reference international standards. In terms of the application of domestic standards to specific items, there were 473 types of instruments/machines, 30 types of medical supplies, and 45 types of dental materials. However, the level of compliance with international standards among the domestic medical device standards was only 21%. Upon detailed analysis, general and collateral standards accounted for 24%, while particular standards accounted for 19%. This indicates a significant deviation from the latest international standards. On the other hand, the level of compliance with international standards was analyzed to be 60% for particular standards and 72% for general and collateral standards in Korean industrial standards (KS). Considering these results, the disparities between domestic standards and international standards underscore the need for discussions on domestic medical device regulation and standardization. In conclusion, this study emphasizes the significance of maintaining up-to-date medical device standards and ensuring their alignment with international standards to ensure the safety and quality of medical devices. The findings highlight the necessity for further efforts to strengthen the domestic standardization system in order to promote the development of safe and high-quality medical devices.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.32.5-32
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• 2002

Processing plasmas are playing a crucial role in either depositing thin films or etching fine patterns. Any variability in process factors (such as radio frequency power or pressure) can cause a significant shift in plasma state. When this shift becomes large enough to change operating condition beyond an acceptable level, overall product quality can greatly be jeopardized. Thus, timely and accurate diagnosis of plasma malfunction is crucial to maintaining device yield and throughput. Many diagnostic systems have been developed, including HIPOCRATES [1] and PIES [2]. Plasma equipment was also diagnosed by combining neural network and expert system called Dempster-Schafer Theory [3]. A fact c...

• 전기학회논문지
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• 제63권3호
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• pp.431-436
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• 2014

In this paper, temperature change properties on the 210kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) are performed with the cooling performance of a water cooling device through the thermal characteristic analysis of the IPMSM considering a real driving pattern of urban railway vehicles. First, the thermal analysis modeling of 210kW-class IPMSM, which is an alternative to the conventional induction motor, and its water cooling device is conducted. Next, the thermal characteristic analysis of the IPMSM considering a real driving pattern of urban railway vehicles is performed using 2-Dimensional FEM tool. Finally, the calculated characteristic results are analyzed. Consequently, it is confirmed that the internal temperature of the 210kW-class IPMSM may be lowered to about 42~52% by maintaining the coolant flow rate of the water cooling device (Cross sectional shape of the pipe has 220mm width and 10mm height) for 0.2kg/s level.

• 산업경영시스템학회지
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• 제41권1호
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• pp.11-23
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• 2018

This paper investigated relationship among internal as well as external motive to receive the ISO 13485 certification, countermeasure to the certification examination, active reception/execution level of the certification, and operational as well as financial performance of the medical device related enterprises in South Korea which received and are maintaining the ISO 13485 certification. SEM (structural equation model) and related analyses using AMOS 21.0 and SPSS 21.0 have been applied to verify the hypotheses of the research. Result of the research showed that internal as well as external motive for certification positively(+) affects active reception/execution level of the certification as well as countermeasure to the certification examination. The reception/execution level of the certification also positively(+) affects on the operational as well as financial performance of the certified enterprises. However, countermeasure to the certification examination was found out to negatively(-) affects the active reception/execution level of the certification and we can interpret that relatively more countermeasure to the certification examination burdens the employees of the enterprise, causing them to be less active on the reception/execution level of the certification. This research found that an enterprise's operational/financial performance improves when an enterprise introduces the ISO 13485 certification standard spontaneously on the purpose of improving its system and the certification system is applied to the enterprise actively, not passively. This research emphasizes the need to recognize the difference of the level of active reception implication among members of an enterprise according to the motive of introduction of the certification system.

• 한국방사선학회논문지
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• 제15권2호
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• pp.159-164
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• 2021

진단용방사선발생장치를 이용한 검사는 영상의학과에서 인체 내 정보를 파악하기 위한 가장 유용한 진단장비 중 하나로 신뢰도가 매우 높다. 이와 같은 이유로, 최근에는 영상의학과 영역의 진단 검사 장비를 이용한 검사 건수가 매년 증가하고 있다. 또한, 검사 건수 증가는 장치의 빠른 노화를 불러일으키고 이로 인해 장치에 대한 정도관리(quality control, QC)의 중요성이 대두된다. 특히, 진단용방사선발생장치를 이용한 검사에서 정도관리란 검사시작부터 검사가 끝날 때 까지 발생할 수 있는 모든 문제점을 사전에 알아내고 대처하여 신뢰가 확보된 영상을 획득하여 제공하는 과정에 있는 일련의 모든 활동을 의미한다. 이에 본 연구에서는 진단용방사선발생장치를 이용한 검사에서 정도관리에 대해보고 한다.

• 벤처창업연구
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• 제7권1호
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• pp.67-72
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• 2012

본 연구는 국내 벤처기업에서 세계 최초로 제조된 요실금 치료기기의 유럽시장 진출을 위하여 국내외 의료기기 시장의 환경변화에 대하여 서술하고 요실금과 치료방법, 그리고 신제품의 특성 및 유럽 요실금 치료기기 시장을 분석하여 유럽시장 진출 방안을 제시하였다. 그 결론으로 국내 의료기기 벤처기업에서 세계 최초로 개발된 요실금 치료기기를 유럽시장에 판매하기 위해서는 다음과 같은 전략이 필요하다. 첫째, 시장침투수준을 증가시키기 위하여 국내 업체는 유럽에서 개최되는 관련 학회 및 전시회 참가 등을 통하여 유럽의 가정의와 비뇨기과 의사들에게 국내에서 개발된 요실금 치료 장비에 대한 인식을 높이는 전략이 필요하다. 둘째, 개성 있는 독특한 제품임과 치료방법의 제시, 그리고 감염률을 줄일 수 있는 비용-효과적인 제품이라는 점의 강조가 필요하다. 셋째, 요실금 치료기기 시장의 경쟁이 심화되고 있는 상황에서 국내의 요실금 치료기기 제조업체는 품질을 확보하면서 가격을 낮출 수 있는 방법 모색을 통하여 품질과 배송, 그리고 가격의 일관성을 제시하여야 할 것으로 연구되었다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제16권3호
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• pp.300-311
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• 2016

The analog-to-digital-converter-based (ADC-based) backplane receivers that consist of a front-end ADC followed by a digital equalizer are gaining more popularity in recent years, as they support more sophisticated equalization required for high data rates, scale better with fabrication technology, and are more immune to PVT variations. Unfortunately, designing an ADC-based receiver that meets tight power and performance budgets of high-speed backplane link systems is non-trivial as both front-end ADC and digital equalizer can be power consuming and complex when running at high speed. This paper reviews the state of art designs for the front-end ADC and digital equalizers to suggest implementation choices that can achieve high speed while maintaining low power consumption and complexity. Design-space exploration using system-level models of the ADC-based receiver allows through analysis on the impact of design parameters, providing useful information in optimizing the power and performance of the receiver at the early stage of design. The system-level simulation results with newer device parameters reveal that, although the power consumption of the ADC-based receiver may not comparable to the receivers with analog equalizers yet, they will become more attractive as the fabrication technology continues to scale as power consumption of digital equalizer scales well with process.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.237-240
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• 2011

본 연구에서는 핀틀 형상의 변곡점 존재 유 무가 SNECMA 노즐목 가변 추력기의 성능에 어떤 영향을 미치는지 알아보기 위해 수치해석을 수행하였다. 그 결과 변곡점의 존재는 요구추력을 유지하면서 공력하중이 감소하는 효과가 있어 전체시스템의 크기와 무게를 감소시킬 수 있다.