• 항공우주기술
• /
• 제7권1호
• /
• pp.83-90
• /
• 2008

차세대 저궤도 위성의 탑재소프트웨어 저장메모리는 부트 코드와 모니터 소프트웨어를 내장한 부트 롬과 비행소프트웨어 이미지를 저장한 듀얼 NVMEM 형태로 개발되고 있다. 부트 롬에 내재된 부트 로더는 프로세서 초기화 이후 GPIO의 입력에 따라 비행소프트웨어 모드 혹은 모니터 모드로 천이하게 된다. 비행소프트웨어 모드에서는 듀얼 NVMEM중 선택된 NVMEM에 대한 CRC를 체크하여 정상적일 경우 NVMEM에 저장되어 있는 탑재소프트웨어를 코드가 수행 될 RAM으로 적재 한 후 VxWorks RTO5를 구동하여 테스크를 생성하여 탑재소프트를 수행하게 된다. 모니터 모드에서는 지상에서 NVMEM reprogramming을 가장 메인으로 수행하며 기본적인 보드 레벨 테스트를 수행할 수 있다. 본 논문에서는 차세대 저궤도 위성의 부트 롬 소프트웨어 설계 및 시뮬레이터 기반의 검증 방법에 대하여 기술한다.

• Biomedical Engineering Letters
• /
• 제8권4호
• /
• pp.399-404
• /
• 2018

The purpose of this study was to evaluate the accuracy of a mobile wireless digital automatic blood pressure monitor for clinical use and mobile health (mHealth). In this study, a manual sphygmomanometer and a digital blood pressure monitor were tested in 100 participants in a repetitive and sequential manner to measure blood pressure. The guidelines for measurement used the Korea Food & Drug Administration protocol, which reflects international standards, such as the American National Standard Institution/Association for the Advancement of Medical Instrumentation SP 10: 1992 and the British Hypertension Society protocol. Measurements were generally consistent across observers according to the measured mean ${\pm}SD$, which ranged in $0.1{\pm}2.6mmHg$ for systolic blood pressure (SBP) and $0.5{\pm}2.2mmHg$ for diastolic blood pressure (DBP). For the device and the observer, the difference in average blood pressure (mean${\pm}$SD) was $2.3{\pm}4.7mmHg$ for SBP and $2.0{\pm}4.2mmHg$ for DBP. The SBP and DBP measured in this study showed accurate measurements that satisfied all criteria, including an average difference that did not exceed 5 mmHg and a standard deviation that did not exceed 8 mmHg. The mobile wireless digital blood pressure monitor has the potential for clinical use and managing one's own health.

• 한국전자통신학회논문지
• /
• 제15권6호
• /
• pp.1159-1168
• /
• 2020

기존에 다수의 인스트루먼트에 대한 제어 및 모니터는 전문화된 영역으로 그 구현에 있어 고가의 전용 모듈을 필요로 하였다. 하지만 최근 임베디드 기술의 발전 속에 M&C(Monitor and Control)를 수행할 수 있는 다양한 제품이 출시되고, 적용 범위가 확대되고 있다. 이에 따라 예전에 비해 소규모의 M&C 환경을 보다 손쉽게 구축할 수 있게 되었다. 본 논문에서는 별도의 하드웨어 제품을 통해 구현해야 했던 VLBI 시스템의 M&C를 저렴한 범용 임베디드 기술로 대체할 수 있는 방안에 대해 논하였다. 메모리 기반의 데이터 송수신 그리고 저장은 비단 VLBI 뿐만 아니라 네트워크 분야에서 일반화된 기술이고, 이더넷을 구성하는 일부 아이템을 VLBI(Very Long Baseline Interferometer) 시스템 환경에 맞게 최적화시킬 경우 보다 효과적인 M&C를 구현할 수 있다. 본 논문에서는 이에 대한 시스템 설계 및 구현 방안을 구체화하였다.

• Journal of Information Technology Applications and Management
• /
• 제28권1호
• /
• pp.83-93
• /
• 2021

The purpose of this study was to develop a personalized SMT (smart monitor target) game interface for game users who enjoy airsoft sports as individual purchases of SMT have increased since the advent of the untouched era. For this study, the UX (user experience) of the game interface was designed based on previous research. In particular, the personalized game service was reinforced by adding the CP (command post) of the SMT system that performs the home function of the console game, which was intended to help the user maintain immersed in the game in the personalized space of the SMT. Major design elements for the SMT game interface included layout, color, graphics, buttons, and text, and the interface design was proceeded based on them. After composing a grid with a layout in which the tab function was applied to the interface with a vertical three-segment structure and the outer margin value secured, the military camouflage pattern and texture were applied to the colored tone to perform graphics work. Targets and thumbnails were produced as illustrations using experts to ensure the consistency of the interface, and then function buttons and texts on each page were used concisely for intuitive information delivery. The design sources organized in this way were developed using the Unity engine. In the future, we hope that game user-centered personalized interfaces will continue to develop and provide differentiated services unique to SMT systems in the airsoft gun market.

• 전자공학회논문지
• /
• 제52권5호
• /
• pp.165-173
• /
• 2015

색각이상자는 색을 인지하는 원추세포의 이상으로 인해 특정 색의 조합을 분별하는데 어려움을 겪는다. 이를 돕기 위해 스마트폰에는 색각이상자를 위한 색 보정 기능이 내장되어 있지만, 모니터에는 이러한 기능이 제공되고 있지 않다. 본 논문에서는 모니터에 내장된 색 조절 기능을 이용하는 색 보정 기법을 제안하고, 이를 모니터에 구현하였다. 제안하는 색 보정 기법은 색각이상자의 색 인지 능력을 HSV 색 공간에서 분석한 것을 기반으로 색각이상의 종류와 강도에 따라 색조와 채도를 보정한다. 색각이상자들을 대상으로 진행한 성능 평가 결과는 제안하는 시스템이 색각이상자가 구분하기 어려운 색을 효과적으로 구분 가능하도록 변환함을 보여준다.

• Journal of Astronomy and Space Sciences
• /
• 제32권4호
• /
• pp.281-287
• /
• 2015

Two mini neutron monitors are installed at Concordia research station (Dome C, Central Antarctica, $75^{\circ}06^{\prime}S$, $123^{\circ}23^{\prime}E$, 3,233 m.a.s.l.). The site has unique properties ideal for cosmic ray measurements, especially for the detection of solar energetic particles: very low cutoff rigidity < 0.01 GV, high elevation and poleward asymptotic acceptance cones pointing to geographical latitudes > $75^{\circ}S$. The instruments consist of a standard neutron monitor and a "bare" (lead-free) neutron monitor. The instrument operation started in mid-January 2015. The barometric correction coefficients were computed for the period from 1 February to 31 July 2015. Several interesting events, including two notable Forbush decreases on 17 March 2015 and 22 June 2015, and a solar particle event of 29 October 2015 were registered. The data sets are available at cosmicrays.oulu.fi and nmdb.eu.

• 한국항공우주학회지
• /
• 제32권10호
• /
• pp.46-52
• /
• 2004

본 논문은 2중으로 다중화된 무인 비행체의 다중화 관리 설계 방법에 대하여 논의한다. CCM(Cross Channel Monitor) 기법의 두 주요 인자, 즉 두 채널간의 편차 허용한도인 문 턱값(threshold) 및 지속시간(persistence count)을 어떻게 설계하여야 하는 가에 관한 문제를 통계학적인 해석을 사용하여 그 해결법을 제시하였다. 또한, 무인 비행체의 생존확률을 증대시킬 수 있는 해석적 다중화 가법에 대한 문제를 칼만 필터링 (Kalman filtering)을 적용하여 접근하였다. 여기서 제시된 방법으로 설계된 CCM 및 칼만 필터링을 이용한 해석적 다중화의 설계 결과들은 XV-15 틸트 로터 비행체에 적용되어, 그 설계의 타당성이 시뮬레이션을 통하여 검증되었다.

• Imaging Science in Dentistry
• /
• 제33권4호
• /
• pp.199-205
• /
• 2003

Purpose: To compare the visibility of the mandibular canal at the different radiographic methods such as conventional panoramic radiographs, Vimplant multi planar reformatting (MPR)-CT panoramic images, Vimplant MPR-CT paraxial images and film-based DentaScan MPR-CT images. Materials and Methods: Data of 11 mandibular dental implant patients, who had been planned treatment utilizing both panoramic and MPR-CT examination with DentaScan software (GE Medical systems, Milwaukee, USA), were used in this study. The archived axial CT data stored on CD-R discs were transferred to a personal computer with 17' LCD monitor. Paraxial and panoramic images were reconstructed using Vimplant software (CyberMed Inc., Seoul, Korea). Conventional panoramic radiographs, monitor-based Vimplant MPR-CT panoramic images, monitor-based Vimplant MPR-CT paraxial images, and film-based DentaScan MPR-CT images were evaluated for visibility of the mandibular canal at the mental foramen, 1 cm, 2 cm, and 3 cm posterior to mental foramen using the 4-point grading score. Results: Vimplant MPR-CT panoramic, paraxial, and DentaScan MPR-CT images revealed significantly clearer images than conventional panoramic radiographs. Particularly at the region 1 em posterior to mental foramen, conventional panoramic radiographs showed a markedly lower percentage of 'excellent' mandibular canal images than images produced by other modalites. Vimplant MPR-CT and DentaScan MPR-CT images did not show significant difference in visibility of the mandibular canal. Conclusion: The study results show that Vimplant and DentaScan MPR-CT imaging systems offer significantly better images of the mandibular canal than conventional panoramic radiograph.

• 한국가구학회지
• /
• 제19권3호
• /
• pp.193-202
• /
• 2008

In order to occupy educational furniture market that grows by the day and to meet demands for alternative product for the current market, this study took business features and productivity of Sinil Furniture Co into consideration, and developed computer desk for education by group, which is new among educational furniture. The scope of the study ranges from data research based on design process into creation of prototype. By improving the condition where, despite that electrically-powered computer desk for anti-theft system is high priced, it sees frequent malfunction, the study suggested low-priced, non- electrically-powered anti-theft system which has more solid structure. Furthermore, in order for the user to be more free and comfortable while studying on it, it differentiates from other products by locating PC main body to the back of the monitor and lowering it below the altitude of monitor to prevent it from interfering with studies. We've made the higher board of the desk in a soft curved-shape in order to lessen the stress from studying. And as space for the monitor's lower mount was decreased, we've put the lower mount below the higher board; so that lacking space can be recovered while functioning as anti-theft system. Moreover, we've covered the PC main body with steel cover so that it would add color and formal luxuriousness to the appearance of the desk. Considering ease of mobility and productivity, knock-down system was introduced.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2001년도 추계학술발표논문집 (하)
• /
• pp.1355-1358
• /
• 2001

IP Multicast can efficiently provide enormous bandwidth savings by enabling sources to send a single copy of a message to multiple recipients who explicitly want to receive the information. But due to the complexity of IP multicast and its fundamental differences from unicast, there are not very many tools available fer monitoring and debugging multicast networks, and only a few experts understand the tools that do exist. This thesis proposes a Multicast Routing Debugger (MRD) system that monitor the status of a multicast network. This system is aimed to multicast-related faults detection. In thesis, first, we define the set of information that should be monitored. Second, the method is developed to take out such information from multicast routers. Third, MRD system is prototyped to collect, process information from heterogeneous routers on a multicast network and to display the various status of the network comprehensively. The prototype of MRD system is implemented and deployed. We perform experiments with several scenarios. Experimental results show we can detect various problems as information that we define is monitored. The MRD system is simple to use, web-based and intuitive tool that can monitor the status of a specific multicast network.