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A Study on the Ubiquitous Wireless Tilt Sensors's Application for Measuring Vertical Deflection of Bridge (교량의 수직처짐 측정을 위한 유비쿼터스 무선경사센서 활용연구)

  • Jo, Byung Wan;Yoon, Kwang Won;Kim, Young Ji;Lee, Dong Yoon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.3
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    • pp.116-124
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    • 2011
  • In this study, a new method to estimate the bridge deflection is developed by using Wireless Tilt Sensor. Most of evaluations of structural integrity, it is very important to measure the geometric profile, which is a major factor representing the global behavior of civil structure, especially bridges. In the past, Because of the lack of appropriate methods to measure the deflection curve of bridges on site, the measurement of deflection had been done restrictly within just a few discrete points along the bridge. Also the measurement point could be limited to locations installed with displacement transducers. So, in this study, the deflection of the structure was measured by wireless tilt sensor instead of LVDT(Linear Variable Differential Transformer). Angle change of tilt sensor shows structural behavior by the change of the resistor values which is presented to voltage. Moreover, the maximum deflection was calculated by changing the deflection angle which was calculated as V(measured voltage) ${\times}$F(factor) to deflection. The experimental tests were carried out to verify the developed deflection estimation techniques. Because the base of tilt measuring is the gravity, uniform measurement is possible independent of a measuring point. Also, measuring values were showed very high accuracy.

Implementation of a Remote Patient Monitoring System using Mobile Phones (모바일 폰을 이용한 원격 환자 관리 시스템의 구현)

  • Park, Hung-Bog;Seo, Jung-Hee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.6
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    • pp.1167-1174
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    • 2009
  • In the monitoring of a patient in a sickroom, not only the physiologic and environmental data of the patient, which is automatically measured, but also the clinical data(clinical chart)of the patient, which is drew up by a doctor or nurse, are recognized as important data. However, since in the current environment of a sickroom, clinical data is collected being divided from the data that is automatically measured, the two data are used without an effective integration. This is because the integration of the two data is difficult due to their different collection times, which leads the reconstruction of clinical data to be remarkably uncertain. In order to solve these problems, a method to synchronize the continuous environmental data of a sickroom and clinical data is appearing as an important measure. In addition, the increase of use of small machines and the development of solutions based on wireless communications provide a communication platform to the developers of health care. Thus, this paper realizes a remote system for taking care of patients based on a web that uses mobile phones. That is, clinical data made by a nurse or doctor and the environmental data of a sick room comes to be collected by a collection module through a wireless sensor network. An observer can see clinical data and the environmental data of a sickroom through his/her mobile phone, integrating and storing his/her data into the database. Families of a patient can see clinical data made by hospital and the environment of the sick room of the patent through their computers or mobile phones outside the hospital. Through the system,hospital can provide better medical services to patients and their families.

Noise Analysis and Measurement for a CW Bio-Radar System for Non-Contact Measurement of Heart and Respiration Rate (호흡 및 심박수 측정을 위한 비접촉 방식의 CW 바이오 레이더 시스템의 잡음 분석 및 측정)

  • Jang, Byung-Jun;Yook, Jong-Gwan;Na, Won;Lee, Moon-Que
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.9
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    • pp.1010-1019
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    • 2008
  • In this paper, we present a noise analysis and measurement results of a bio-radar system that can detect human heartbeat and respiration signals. The noise analysis including various phase noise effects is very important in designing the bio-radar system, since the frequency difference between the received signal and local oscillator is very small and the received power is very low. All of the noise components in a bio-radar system are considered from the point of view of SNR. From this analysis, it can be concluded that the phase noise due to antenna leakage is a dominant factor and is a function of range correlation. Therefore, the phase noise component with range correlation effect, which is the most important noise contribution, is measured using the measurement setup and compared with the calculated results. From the measurement results, our measurement setup can measure a closed-in phase noise of a free-running oscillator. Based on these results, it is possible to design a 2.4 GHz bio-radar system quantitatively which has a detection range of 50 cm and low power of 1 mW without additional PLL circuits.

Self-Calibration for Direction Finding in Multi-Baseline Interferometer System (멀티베이스라인 인터페로미터 시스템에서의 자체 교정 방향 탐지 방법)

  • Kim, Ji-Tae;Kim, Young-Soo;Kang, Jong-Jin;Lee, Duk-Yung;Roh, Ji-Hyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.4
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    • pp.433-442
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    • 2010
  • In this paper, self-calibration algorithm based on covariance matrix is proposed for compensating amplitude/phase mismatch in multi-baseline interferometer direction finding system. The proposed method is a solution to nonlinear constrained minimization problem which dramatically calibrate mismatch error using space sector concept with cost function as defined in this paper. This method, however, has a drawback that requires an estimated initial angle to determine the proper space sector. It is well known that this type of drawback is common in nonlinear optimization problem. Superior calibration capabilities achieved with this approach are illustrated by simulation experiments in comparison with interferometer algorithm for a varitiety of amplitude/phase mismatch error. Furthermore, this approach has been found to provide an exceptional calibration capabilities even in case amplitude and phase mismatch are more than 30 dB and over $5^{\circ}$, respectively, with sector spacing of less than $50^{\circ}$.

A real-time construction management of a tunnel using position tracking sensor (위치추적 센서를 이용한 터널의 실시간 시공관리)

  • Lee, Kang-Hyun;Kim, Dae-Won;Mun, Sung-Mo;Cho, Hun-Hee;Kang, Kyung-In;Lee, In-Mo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.13 no.2
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    • pp.133-148
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    • 2011
  • Construction sites are becoming larger and complex with the growth of national economy. Accordingly, it is important to identify real-time information about materials, equipments, and manpower during construction at sites. Even though research utilizing position tracking sensors has been conducted in architectural engineering fields, this area of research is almost nil in civil engineering fields. Therefore, a feasibility study to find a way to apply position tracking sensors to an in-situ tunnel construction site adopting conventional tunnelling method is performed in this study. A methodology is proposed that the progress management of the tunnelling work can be monitored by checking construction materials needed at job site and the safety management system can be assessed by checking distance between in-situ workers and construction equipments. The most representative materials were identified so that IT technology can be applied by attaching and monitoring sensors to the selected materials. Also, time of arrival (TOA) for a position determination technology along with a wireless network technology was chosen and build wireless network system. The adopted methodology was applied to an in-situ tunnelling site, and verified the usefulness of the proposed system.

Green Port Strategies for Reducing Air Pollution in Port of Incheon (대기오염 저감을 통한 인천항의 Green Port 전략)

  • Han, Chul-Hwan
    • Journal of Korea Port Economic Association
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    • v.27 no.1
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    • pp.281-304
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    • 2011
  • In the energy-climate era, pollution emissions from port activities have a significant issue in international shipping and port community. Thus international organization such as IMO and developed countries are seeking to develop various reduction strategies against air pollution. However Korea has recently conducted several studies concerning air pollution in port industry. The main purpose of the paper is to suggest emission reduction strategies for bulk terminal in Port of Incheon, which handles large amount bulk cargoes as a gateway for the metropolitan area. For this aim, the clean air strategies of the world major ports were considered and air pollution reduction strategies were suggested. The main findings of this paper are as follows. First, the emission reduction strategies for container terminal are should be integrated based on technologies changes, operational changes and market-based measures. Second, the emission reduction strategies for bulk terminal can be effective when use innovative measures during loading, unloading and storage process such as telescopic cascade trimming chute, snake sandwich equipment, dry fog system and dome structure. Finally, investigation on actual conditions of air pollution in Korean ports and development of environmental evaluation scheme for persisting monitoring should be conducted.

A Study on Total Mixed Ration Feeding System for Feeding Pigs (1) - Development of Monorail Traveling TMR Feeder for Grow-Finish Pigs -

  • Kim, Hyuck Joo;Yu, Byeong Kee;Hong, Jong Tae;Choi, Kyu Hong;Yu, Ji Su;Hong, Youngsin;Ha, Yu Shin
    • Journal of Biosystems Engineering
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    • v.38 no.4
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    • pp.295-305
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    • 2013
  • Purpose: Recent research showed that total mixed ration (TMR) feeding for pigs improved the productivity and reduced feed cost and manure odor. An automatic TMR feeding system was developed for this study because the conventional feeder cannot deliver the TMR containing roughage. Methods: Conventional feeding systems and physical properties of TMR were surveyed, and performance tests of the conventional feeder were conducted to develop a TMR feeder. Based on the TMR feeder was developed and installed, driving, measuring weight, radio frequency identification (RFID) reading, and discharging test for feeding were conducted to ensure the performance. Results: Moisture content, density, and angle of repose of the TMR 1 (mixture of 30% cut IRG silage and 70% concentrates) were 31.6%, 387 $kg/m^3$, and $51^{\circ}$, respectively. Moisture content, density, and angle of repose of the TMR 2 (mixture of 45% concentrates, 30% cut IRG silage and by-products, 10% bean curd refuse, 10% others, and 5% fermenter) were 22.2%, 544 $kg/m^3$, and $50^{\circ}$, respectively. The coefficient of variation (C.V.) of conventional concentrate feeding were 1.9~4.1%, and C.V. of TMR containing 1~3% cut IRG roughage feeding by conventional feeder were 9~42%. The conventional disc type feeder was not suitable for TMR feeding because the supply unit was clogged. The C.V. of TMR 1 was 0.6~7.9% when 0.5~10 kg of the TMR supplied, and it was suitable for feeding grow-finish pigs and sows. On the contrary, the C.V. with TMR 2 was 28% when 0.5 kg of the TMR supplied, and it was not suitable for feeding sows. Conclusions: The TMR feeder developed in this study was suitable for feeding grow-finish pigs because the feeder performed stably with over 5.0 kg feed. However, the feeder showed a lack of accuracy for feeding sows because the amount of each feed was more than 0.5 kg per a feeding. Therefore, the improvement of outlet structure for accurate feeding is needed for sow feeding.

Design and Implementation of the u-Health Care Services in the Life Environment (생활환경 기반 u-건강관리서비스 설계 및 구현)

  • Hong, In-Hwa;Kim, Ju-Young;Choi, Ho-Chun;Kim, Chan-Gyu;Jung, Kwang-Mo;Kim, Nam-Il;Kang, Jeong-Jin
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.6
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    • pp.107-118
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    • 2011
  • This paper shows a u-Health management system in user's Life environment, which is different from previous ones by enterprises. It's designed for users(citizens) and service provider(especially providing medical service). This paper is discussing on the proof on the service model being operated near the Tancheon stream in the city of Sung-nam. To maximize users' satisfaction, this service has been designed on four disciplines(so easy, so simple, well-customized, funny feedback) in the viewpoint for users. Its algorithm has 4 levels which are measurement, prescription, monitoring and feedback. In the system. there are HCBs(health check boothes) checking out status and assessment of users, customized health prescription customized a health management service prescription engine, exercise programs customized on exercise equipments near the stream and monitoring system.

Proposal Strategy and Performance Analysis of Electronic Human Resources Management Pilot Project (건설근로자공제회 전자인력관리(전자카드제)시범사업 성과 분석 및 추진전략 도출)

  • Kim, Inchie;Chin, Sangyoon;Kim, Seongah;Kim, Yeasang;Lee, Sangjun;Park, Soohun
    • Korean Journal of Construction Engineering and Management
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    • v.19 no.4
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    • pp.3-11
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    • 2018
  • The Construction Workers Mutual Aid Association is carrying out a number of strategic tasks with the goal of "contributing to improving employment and stabilizing the return of workers to construction workers through employment welfare and retirement deduction services." One of them is the retirement deduction system. The retirement allowance system is a system for the retirement income and livelihood security of construction workers who are not adequately protected by the Labor Standards Act, such as retirement allowances due to the nature of day labor. The Construction Workers Mutual Aid Association has promoted the introduction of electronic manpower management. For the efficient management of the pilot sites and the plans for the future, comprehensive evaluation of the pilot sites as well as the evaluation of the status and operation results of each pilot project site are needed. Therefore, in this study, we will develop performance indicators to evaluate the current state of electronic manpower pilot projects and analyze the actual situation of pilot project sites through actual application, and try to derive future implementation strategies.

A Study on Integrated Anti-counterfeiting Strategy to stop the forgery for Korean cosmetics in China (중국에서 한국 화장품의 위조근절을 위한 통합적 위조방지 전략 연구)

  • Koh, Joong Hyun
    • International Commerce and Information Review
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    • v.18 no.4
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    • pp.81-112
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    • 2016
  • About 60 percent of cosmetic products sold in the dominant Taobao internet shopping mall proved recently to be counterfeit products made in China. This paper is to investigate the anti-counterfeiting strategies to clean up fake goods for Korean cosmetics which have been exported to China. Using the scienter rule the paper classified the forgery action for Korean cosmetics into four broad groups - counterfeit, piracy, illegally distributed product, and brand prior register. This paper suggested interior company's anti-counterfeiting strategies for each group, focusing on the construction for an integrated anti-counterfeiting system including consumer's rationality through the government cooperation between Korea and China.

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