• Title/Summary/Keyword: Malfunction

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Analysis on Eating Behavior and Nutritional Status of Nephritic Patients with Mild Kidney Malfunction in Korea (신장염 환자의 식행동 및 영양상태 평가)

  • 김종연;오세영;임천규
    • Journal of Nutrition and Health
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    • v.34 no.7
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    • pp.770-777
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    • 2001
  • This study investigated nutritional status and eating behaviors among 59 nephritic patients with mild kidney malfunction in Korea. Nutritional status was measured by blood analysis and 1-3 day dietary recall and records, and eating behaviors were assessed by a questionnaire. Mean Body Mass Index(BMI) was within the normal range, while 21% and 14% of the patients were underweight and overweight, respectively. They received nutrition information mainly from doctors, nurses and mass media, but rarely from nutrition professionals. A quarter of patients skipped breakfast at least 3 times per 12% of the patients, respectively. Energy intake of 83% of the patients was less than the recommended level. Protein intakes of 56% of them were either under or over the recommended levels. Patients had low vitamin B$_2$ and calcium(<75% of the RDA) and excessive phosphorus(138% RDA) and vitamin C(170% RDA). Major food sources to absolute nutrient intakes were similar to those for the average Koreas, except for milk. Milk intake was low in our patients. Dietary quantity and quality were associated positively with BMI, albumin, and HDL-cholesterol and negatively with triglycerides and BUN. Results of this study indicate low nutritional status of the patients and, in turn a need for conducting nutritional education or counselling at regular at regular basis for the nephritic patients with mild kidney malfunction.

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The Damage of Microcontroller Devices due to Coupling Effects under High Power Electromagnetic Wave by Magnetron (고출력 전자기파의 커플링 효과에 의한 마이크로 컨트롤러의 손상)

  • Hong, Joo-Il;Hwang, Sun-Mook;Huh, Chang-Su
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2263-2268
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    • 2008
  • We investigated the malfunction and destruction characteristics of microcontroller devices under high power electromagnetic(HPEM) wave by magnetron. HPEM was rated at a microwave output of 0 to 1,000 W, at a frequency of 2,450${\pm}$50 MHz and was radiated from the open-ended standard rectangular waveguide(WR-340) to free space. The influence of different reset-, clock-, data-, and power supply-line lengths has been tested. The variation of the line length was done with flat cables. The susceptibility of the tested microcontroller devices was in general much influenced by clock-, reset-, and power supply-line length, little influenced by data-line length. Further the line length was increased, the malfunction threshold was decreased as expected, because more energy couples to the devices. The surfaces of the destroyed microcontroller devices were removed and the chip conditions were investigated with microscope. The microscopic analysis of the damaged devices showed component and bondwire destructions such as breakthroughs and melting due to thermal effects. The obtained results are expected to provide fundamental data for interpreting the combined mechanism of microcontroller devices in an intentional microwave environment.

Real-time malfunction detection of plasma etching process using EPD signal traces (EPD 신호궤적을 이용한 플라즈마 식각공정의 실시간 이상검출)

  • Cha, Sang-Yeob;Yi, Seok-Ju;Koh, Taek-Beom;Woo, Kwang-Bang
    • Journal of Institute of Control, Robotics and Systems
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    • v.4 no.2
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    • pp.246-255
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    • 1998
  • This paper presents a novel method for real-time malfunction detection of plasma etching process using EPD signal traces. First, many reference EPD signal traces are collected using monochromator and data acquisition system in normal etching processes. Critical points are defined by applying differentiation and zero-crossing method to the collected reference signal traces. Critical parameters such as intensity, slope, time, peak, overshoot, etc., determined by critical points, and frame attributes transformed signal-to symbol of reference signal traces are saved. Also, UCL(Upper Control Limit) and LCL(Lower Control Limit) are obtained by mean and standard deviation of critical parameters. Then, test EPD signal traces are collected in the actual processes, and frame attributes and critical parameters are obtained using the above mentioned method. Process malfunctions are detected in real-time by applying SPC(Statistical Process Control) method to critical parameters. the Real-time malfunction detection method presented in this paper was applied to actual processes and the results indicated that it was proved to be able to supplement disadvantages of existing quality control check inspecting or testing random-selected devices and detect process malfunctions correctly in real-time.

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Object Magnification and Voice Command in Gaze Interface for the Upper Limb Disabled (상지장애인을 위한 시선 인터페이스에서의 객체 확대 및 음성 명령 인터페이스 개발)

  • Park, Joo Hyun;Jo, Se-Ran;Lim, Soon-Bum
    • Journal of Korea Multimedia Society
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    • v.24 no.7
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    • pp.903-912
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    • 2021
  • Eye tracking research for upper limb disabilities is showing an effect in the aspect of device control. However, the reality is that it is not enough to perform web interaction with only eye tracking technology. In the Eye-Voice interface, a previous study, in order to solve the problem that the existing gaze tracking interfaces cause a malfunction of pointer execution, a gaze tracking interface supplemented with a voice command was proposed. In addition, the reduction of the malfunction rate of the pointer was confirmed through a comparison experiment with the existing interface. In this process, the difficulty of pointing due to the small size of the execution object in the web environment was identified as another important problem of malfunction. In this study, we propose an auto-magnification interface of objects so that people with upper extremities can freely click web contents by improving the problem that it was difficult to point and execute due to the high density of execution objects and their arrangements in web pages.

A Data Fault Detection System for Diesel Engines Using Neural Networks (신경회로망을 이용한 디젤기관의 데이터 이상감지 시스템에 관한 연구)

  • 천행춘;유영호
    • Journal of Advanced Marine Engineering and Technology
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    • v.26 no.4
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    • pp.493-500
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    • 2002
  • The operational data of diesel generator engine is two kinds of data. One is interactive the other is non interactive. We can find the fault information from interactive data measured for every sampling time when the changing rate, direction and status of data are investigated in comparition with those of normal status to diagnose the fault of combustion system. The various data values of combustion system for diesel engine are not proportional to load condition. The criterion to decide the level of data value is not absolute but relative to relational data. This study proposes to compose malfunction diagnosis engine using neural networks to decide that level of data value is out of normal status with the data collected from generator engine of the ship using the commercial data mining tool. This paper investigates the real ship's operational data of diesel generator engine and confirms usefulness of fault detecting through simulations for fault detecting.

A Study on the Modeling and Diagnostics in Drilling Operation (드릴링 작업의 모델링과 진단법에 관한 연구)

  • Yoon, M.C.
    • Journal of Power System Engineering
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    • v.2 no.2
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    • pp.73-80
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    • 1998
  • The identification of drilling joint dynamics which consists of drilling and structural dynamics and the on-line time series detection of malfunction process is substantial not only for the investigation of the static and dynamic characteristics but also for the analytic realization of diagnostic and control systems in drilling. Therefore, We have discussed on the comparative assessment of two recursive time series modeling algorithms that can represent the drilling operation and detect the abnormal geometric behaviors in precision roundshape machining such as turning, drilling and boring in precision diemaking. For this purpose, simulation and experimental work were performed to show the malfunctional behaviors for drilling operation. For this purpose, a new two recursive approach (Recursive Extended Instrument Variable Method : REIVM, Recursive Least Square Method : RLSM) may be adopted for the on-line system identification and monitoring of a malfunction behavior of drilling process, such as chipping, wear, chatter and hole lobe waviness.

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A Study on the Operation of Distribution System for Increasing Grid-Connected Distributed Generation (분산형전원 연계용량 증가를 위한 배전계통 운영방식에 관한 연구)

  • Nam-Koong, Won;Jang, Moon-Jong;Lee, Sung-Woo;Seo, Dong-Wan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.9
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    • pp.83-88
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    • 2014
  • When DG interconnection into network is examined, details of the review are overvoltage, protective device malfunction, etc. In the case of protective device malfunction, replacing protective device into bi-directional protective device and installation NGR are the solution. Overvoltage at interconnection point occurs because the load is relatively less than DG output. When overvoltage at interconnection point occurs, DG interconnection is not permitted because this overvoltage affect other customers. Interconnection by installation new distribution line is one solution but it costs much money. Without installation new investment, change of NOP(Normal Open Point) position is a possible solution about DG interconnection into network.