• Title/Summary/Keyword: CSS System

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Performance Evaluation of Location Estimation System Using a Non Fixed Single Receiver

  • Myagmar, Enkhzaya;Kwon, Soon-Ryang
    • International Journal of Contents
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    • v.10 no.4
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    • pp.69-74
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    • 2014
  • General location aware systems are only applied to indoor and outdoor environments using more than three transmitters to estimate a fixed object location. Those kinds of systems have environmental restrictions that require an already established infrastructure. To solve this problem, an Object Location Estimation (OLE) algorithm based on PTP (Point To Point) communication has been proposed. However, the problem with this method is that deduction of performance parameters is not enough and location estimation is very difficult because of unknown restriction conditions. From experimental tests in this research, we determined that the performance parameters for restriction conditions are a maximum transmission distance of CSS communication and an optimum moving distance interval between personal locations. In this paper, a system applied OLE algorithm based on PTP communication is implemented using a CSS (Chirp Spread Spectrum) communication module. A maximum transmission distance for CSS communication and an optimum moving distance interval between personal locations are then deducted and studied to estimate a fixed object location for generalization.

Implementation of HTML5-based Hybrid Mobile Office System (HTML5 기반의 하이브리드 모바일 오피스 시스템 구현)

  • Choi, Yong-Kyu;Lee, Bong-Hwan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.725-729
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    • 2012
  • In this paper, the standardization of the Web technology of HTML5/CSS3 and JQuery Mobile, using a variety of mobile platforms, run independently within an environment as possible to implement the Mobile Office System. In addition, user friendly Web interface and dynamic web design through a mobile device in a Mobile Office system provides convenience to the user when a hybrid Web application based mobile office system implement.

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Endotracheal Colonization and Ventilator-associated Pneumonia in Mechanically Ventilated Patients according to Type of Endotracheal Suction System (기관 흡인술 유형에 따른 인공호흡기 적용 환자의 기관 내 균집락화와 폐렴 발생률)

  • Cha, Kyeong-Sook;Park, Ho-Ran
    • Journal of Korean Academy of Nursing
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    • v.41 no.2
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    • pp.175-181
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    • 2011
  • Purpose: This study was conducted to identify endotracheal colonization and the incidence of ventilator-associated pneumonia related to the type of endotracheal suction system. Methods: The participants in this study were ICU patients hospitalized between October 2009 to March 2010 who used ventilators for over 48 hr with closed (CSS, n=30) or open (OSS, n=32) suction systems. To standardize the pre-intervention suction system, a suctioning protocol was taught to the ICU nurses. Collected data were analyzed using ${\chi}^2$-test, Fisher's exact test, Wilcoxon rank sums test, Wilcoxon test, Log-rank test and Poisson regression. Results: Endotracheal colonization was higher in OSS than CSS from day 1 to day 8 while using a ventilator and there was a significant difference between the two groups. The CSS reached 50% of endotracheal colonization by the 4th day, whereas for the OSS, it was the 2nd day (p=.04). The incidence of ventilator-associated pneumonia showed no significant difference. Conclusion: For patients with a high risk of pneumonia, CSS must be used to lower endotracheal colonization.

A Study on the Location Awareness System Using TOA(Time of Arrival) of CSS(Chirp Spread Spectrum) Algorithm (CSS 기반의 TOA 알고리즘을 이용한 위치인식 시스템 구현에 관한 연구)

  • Kim, Jung-Soo;Yang, Jin-Uk;Yang, Sung-Hyun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.2
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    • pp.13-25
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    • 2008
  • In this paper, we propose the Location Awareness System adjusting Ranging Technology for CSS(Chirp Spread Spectrum) which is adopted on 2.45GHz standard in IEEE 802.15.4a and TOA(Time-of-Arrival) algorithm. The conventional methods have adopted RSSI, ultrasonic waves and infrared rays in Zigbee. RSSI measures strength indication of received signal and recognizes the position of nodes in RF boundary. However, this technology has the following problems; lots of error by the change of the channel environment and much power consumption. In this paper, adopting chirp pulse on 2.45GHz standard in IEEE 802.15.4a and SDS-TWR(Symmetrical Double Side-Two Way Ranging) method using the characteristic of Spread Spectrum, a new Location Awareness System is suggested. The distance and the coordinate are measured within ${\pm}\;5cm$ by TOA(Time of Arrival) algorithm and proposed algorithm and the data in error rate is decreased less than 1%. Through these results, the algorithm suggested in this paper is verified for its performance in a computer simulation.

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Development and Product Quality of High Nutrition-Low Cost Supplementary Foods for the Children for Wonseong Country Comprehensive Nutrition Program in Korea -Part I : Formulation and production performance of Proposed Supplementary Foods- (원성군 시범종합영양사업을 위한 어린이용 고영양보충식품의 개발에 관한 연구 -제 1 보 : 제품의 조제 및 생산시험-)

  • Cheigh, Hong-Sik;Pyun, Yoo-Ryang;Ryu, Chung-Hee;Kwon, Tai-Wan
    • Journal of Nutrition and Health
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    • v.13 no.4
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    • pp.199-206
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    • 1980
  • Formulation and production performance of proposed high nutriton-low cost (HNLC) supplementary foods for children in Korea were studied for Wonseong County Comprehensive Nutrition Program. The basic formulas recommendable from the experimental results on the nutritional value, organoleptical qualities and mechanical performance using MFM-KIST extrusion cooking system were considered as CSS-3, CSS-4 and BSS-4. Initial priority of application soybean was with CSS-4(68% corn flour, defatted soybean flour 20%, sesame 2%, corn oil 4%, sugar 4%, salt 1%, vitamins, mineral and other additives 1%). All these formulas as on rioted snack type-HNLC supplementary foods were found in the acceptable range of mechanical, organoleptical and economical point of view.

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EKF based Mobile Robot Indoor Localization using Pattern Matching (패턴 매칭을 이용한 EKF 기반 이동 로봇 실내 위치 추정)

  • Kim, Seok-Young;Lee, Ji-Hong
    • The Journal of Korea Robotics Society
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    • v.7 no.1
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    • pp.45-56
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    • 2012
  • This paper proposes how to improve the performance of CSS-based indoor localization system. CSS based localization utilizes signal flight time between anchors and tag to estimate distance. From the distances, the 3-dimensional position is calculated through trilateration. However the error in distance caused from multi-path effect transfers to the position error especially in indoor environment. This paper handles a problem of reducing error in raw distance information. And, we propose the new localization method by pattern matching instead of the conventional localization method based on trilateration that is affected heavily on multi-path error. The pattern matching method estimates the position by using the fact that the measured data of near positions possesses a high similarity. In order to gain better performance of localization, we use EKF(Extended Kalman Filter) to fuse the result of CSS based localization and robot model.

Development of Contents Syndication Systems for Engineering Information Management in Semi-conductor Industries (반도체 산업의 공학 정보 관리를 위한 컨텐츠 신디케이션 시스템의 개발)

  • Kim, Tae-Yoon;Koo, Sang-Hoe
    • Journal of Information Technology Applications and Management
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    • v.13 no.4
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    • pp.109-120
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    • 2006
  • Enterprise Content Integration (ECI)is an IT strategy that improves enterprise' competitive advantages by integrating enterprise wide information and content into a unified view, which in turn supports efficient and effective decision making. Content Syndication Systems (CSS) is a solution that implements the ECI strategy. In semi-conductor industries, it is usual that enterprise content is scattered over tens of legacy systems. Therefore, engineers in semi-conductor companies spend a few hours to locate required engineering information on a daily basis as part of their jobs. In this paper, we develop an enterprise CSS system that integrates enterprise wide contents into a unified view that is suitable for semi-conductor industries. For this research, we first define enterprise CSS, then identify their systems requirements. Then we propose an architecture supporting the identified requirements, and present the implemented prototype. One of the most important requirements is the individualized subscription rule setting for engineering information. For this purpose, we developed methods to represent the information properties and subscription rules.

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Dual-Band Filtering Method Considering to Efficiency of Performance and Complexity in DBO-CSS System (DBO-CSS 시스템에서 성능과 복잡도의 효율성을 고려한 이중 대역 필터링 방법)

  • Jeong, Jin-Doo;Jin, Yong-Sun;Chong, Jong-Wha
    • 전자공학회논문지 IE
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    • v.47 no.2
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    • pp.60-65
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    • 2010
  • In this paper, we propose a dual-band filtering method optimized to DBO-CSS systems which are alternatively transmitted in low and high bands. The conventional channel filter which passes entire signal bandwidth causes a problem that excessive noise in neighboring sub-band is added while one of signals in two sub-bands is received. The dual-band filtering proposed in this paper can overcome the performance degradation in the conventional filtering method without increase of hardware complexity. The proposed method is based on two filters to be matched with DBO-CSS signals receiving alternatively and can exclude the undesired noise in neighboring sub-band. Simulation results for the proposed method show better performance about 2.5dB than the conventional one.

Numerical Stability of Serial Staggered Methods in Fluid-Structure Interaction Analysis of Solid Rocket Motors (고체추진기관의 유동-구조 상호작용 해석에서 Serial Staggered 기법의 수치 안정성)

  • Cho, Hyun-Joo;Lee, Jee-Ho;Lee, Chang-Soo;Kim, Chong-Am;Kim, Shin-Hoe;Lee, Jeong-Sub
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.2
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    • pp.179-185
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    • 2016
  • In this paper numerical stability of CSS and ISS schemes in axisymmetric fluid-structure-burning simulation for solid rocket motors are studied. The implemented CSS and ISS algorithms for two-dimensional axisymmetric FSI problems are used to analyze ACM and BCM solid rocket motors. Numerical results from CSS and ISS schemes are compared to investigate the efficacy of ISS scheme over CSS scheme in stabilizing the numerical solution. The ACM and BCM simulation results show that ISS scheme gives stable and converged numerical solutions with appropriately small system time step size, while CSS scheme fails to converge after generating rapidly amplified oscillatory solutions. It is concluded that ISS scheme can be useful in improving the numerical stability of FSI analysis for ACM and BCM solid rocket motor simulations, which is not successfully obtained with CSS scheme.

HTML5 based Hybrid Mobile Office System Development (HTML5 기반의 하이브리드 모바일 오피스 시스템 개발)

  • Choi, Yong-kyu;Lee, Bong-hwan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.202-206
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    • 2012
  • In this paper, we use HTML5/CSS3, Mobile JQuery Web of standardized technology, Run independently on a variety of mobile platforms. And to the users provide a user-friendly Web interface, and reduce the discomfort of the users through dynamic web design Implementation of a hybrid mobile office system.

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