• Title/Summary/Keyword: Life supplies

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Agile and Intelligent Manufacturing System for a Small IT Parts Assembly (초소형 IT 부품 조립을 위한 지능형 민첩 생산시스템)

  • Kim, Won;Kang, Heui-Seok;Cho, Young-June;Jung, Ji-Young;Suh, Il-Hong
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.5
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    • pp.499-506
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    • 2007
  • The tiny camera module used in a modern cellular phone requires precise assembly processes. To meet the requirement of high resolution and functionality, the number of parts used in a camera module becomes larger and larger. As the market grows rapidly, an automatic camera phone assembly process is required. However, diverse production line and short life cycle make it difficult to build an affordable assembly line. To attack this problem, a flexible and expandable lens assembly system is proposed. To save the manufacturing line set-up time, modular concept is adopted. Also, each module is designed to have intelligence to simplify the set-up process. The assembly system is built up on the standard flat-form that includes a vibration free base, air and electric supplies, and electronic controllers, etc. Furthermore, the assembly cell has the capability of handling tiny, thin, or transparent parts which are very difficult to identify without machine vision.

A Development Trend Study of Bipropellant Rocket Engine for Orbit Transfer and Attitude Control of Satellite (인공위성 궤도전이 및 자세제어용 이원추진제 로켓엔진의 개발현황)

  • Jang, Yo Han;Lee, Kyun Ho
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.1
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    • pp.50-60
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    • 2015
  • A propulsion system of a satellite provides a necessary thrust to reach to the final orbit after a separation from a launch vehicle. Also, it supplies pulse moments to maintain the satellite in a mission orbit and for its attitude controls during a mission life time. The present study investigates the development trend of bipropellant rocket engines for an orbit transfer and an attitude control of a satellite using monomethylhydrazine and hydrazine for fuel and dinitrogen tetroxide for oxidizer to derive fundamental specifications which are necessary for domestic development researches. Also, their major performance characteristics are summarized.

An Implementation of an Integrated Degasing System for Aluminum Molten Metal in Continuous Casting (알루미늄 연속주조 용탕의 탈 가스 일체화 장치 개발)

  • Lee, Yong-Joong
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.1
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    • pp.1-6
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    • 2008
  • There are some methods that have been used to manage a degasing process in recent years, such as an injection method that uses aluminum molten metal powder and chemicals supplier and input method that supplies argon and nitrogen, or chlorine gas by using a gas blow-tube. However, these methods show some problems, and it shows that it is a difficult process to handle, pollution due to producing a lot of toxic gases like chlorine and fluoride gas, irregular effects, and lowering work efficiency due to the excessive processing time. The problems that are the most fatal are the producing a lot of sludge due to the reaction of aluminum molten metal with chemicals, loss of metals, and decreasing the life of refractory materials. In order to solve these problems, this paper develops a technology that is related to aluminum continuous casting molten metal and monolithic degasing apparatus. A degasing apparatus developed in this study improved the existing methods and prevented environmental pollution with smokeless, odorless, and harmlessness by using a new method that applies argon and nitrogen gas in which the methods used in the West and Japan are eliminated. The method developed in this study decreases the molten metal processing and settling time compared to the existing methods and improves the workers' health, safety, and environment because there is no pollution in processes.

Study on 3D Numerical Analysis of Stack Effect Reduction in Stairwell of Building (건축물 계단에서의 연돌효과 저감방안에 대한 3차원 수치해석 연구)

  • Kim, Jung-Yup;Kim, Ji-Seok
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.27 no.3
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    • pp.152-157
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    • 2015
  • Stack effect on high-rise building have negative effect on living environment, energy and life-safety aspect. Thus, it's necessary to find the measure to reduce the stack effect. As a result of field test on a 31-story building, a circulating type stack effect reduction technology was developed, which supplies air in the low stairs and discharges air in the high stairs. To evaluate the performance of this circulating type stack effect reduction technology on building stairs, a 3D numerical analysis was carried out by using Momentum Loss Model for analyzing leakage flow between compartments in a building. Consequently, numerical analysis proved that the stack effect on building stairs was reduced by a circulating type stack effect reduction technology.

Development of the Processing System for Pre-washed Rice

  • Choi H. S.;Cho K. H.;Park H. M.;Kim Y. H.;Keum D. H.
    • Agricultural and Biosystems Engineering
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    • v.5 no.2
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    • pp.60-63
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    • 2004
  • Demand for development of processing systems for pre-washed rice and propagation of the systems has recently been on the rise, because rice-cooking requires watering 15 times the rice quantity to cook, as in case of the regular rice currently being circulated in Korean market, in addition to paying the trouble of washing it for cooking, and besides the milky turbid water coming from the rice-washing contributes to water contamination. In this study, therefore, a processing system for pre-washed rice was designed and built with rice surface polishing devices that adopted abrading and airing methods, an electrostatic method and a method using a fine watering, to conduct its performance test. The result showed that turbidity of the wash water, which is the base to determine the pre-washed rice standard, turned out 47.33 ppm and 48.00 ppm respectively for 800 kg/hr and 1,000 kg/hr supplies, which meets the standard for the processing system free from rice-washing for cooking. The quantity of watering at this experiment was only 0.43 times the rice, thus resulting in curtailment of process-watering by approximately $69\%$ compared with the existing wet-type pre-washed rice processing system popular in Korean market.

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Influence Factors on Health and Medical of Retirees Expense to Public Pension Recipients (공적연금유형에 따른 은퇴자들의 보건의료비지출 결정요인)

  • Choi, Ryoung;Hwang, Byung Deog
    • Health Policy and Management
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    • v.25 no.2
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    • pp.80-89
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    • 2015
  • Background: This study aims to identify the monthly average medical expenses of public pension recipients, and analyze the determinants of total health and medical expenses and Western and Oriental medicine expenses, medical service expenses, and medical supplies expenses. Methods: This study used the fifth year data of 2013 out of the raw data of the Korean Retirement and Income Study collected by the National Pension Research Institute. This study conducted t-test, analysis of variance, and linear regression to verify publicly the relevance between pension recipients' general characteristics and health and medical expenses status using IBM SPSS ver. 21.0 for data analysis. Results: It was analyzed that there is a difference in the spending of expenditure and health care costs according to public pension recipients. Medical expenses of the national pensioners was higher compared to the special corporate pensioners. The national pensioner is related expenditure size, education level, family members living together, residential areas, status of spouse, number of chronic illness, and status of limitation in daily life with psychological health status. Conclusion: Therefore, fairness does not occur fire to the medical use between the special corporate pensioners and national pensioners, aggressive of government such as health policy and financial support for the retiree pension policy that reflects the reality intervention would be required.

Structural and Dynamic Characteristic Analysis for Automatic Magazine Feeder in Automation Assembly System for LED Convergency Lighting (LED 융합조명의 자동화 조립 시스템에서 전자동 매거진 피더에 관한 구조해석과 동특성 분석)

  • Choo, Se-Woong;Jeong, Sang-Hwa
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.1
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    • pp.23-33
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    • 2018
  • In the general manual feeder of an LED lighting assembly system, many workers are needed to supply parts to the main conveyor. The automatic feeder for modern automation lighting assembly systems consists of a completely automated feeding system and a magazine system that supplies the parts automatically. A standardized LED panel and diffusion cover is stacked in the cartridge of the magazine system. The structural safety of the automatic feeding system with regard to handling the load from the panels and covers stored in the cartridge should be guaranteed. LED convergency lighting modules are assembled using two LED panels and one diffusion cover in an automatic feeder. In this study, the structural safety and fatigue life of the automatic feeder and magazine were analyzed by considering the load generated in the automatically assembled LED convergency lighting system. In addition, the dynamic behavior of each auto-feeding system and magazine delivery system was visualized, and the working process was evaluated via dynamic simulation using a virtual engineering method. A tack time table for automatic feeding systems was derived by developing a virtual prototype.

Optimal Order Quantity Models for three types of reverse logistics networks in Product Recovery Environment

  • Kim Juyong;Kim Kibum;Jeong Bongju
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2004.10a
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    • pp.565-565
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    • 2004
  • Due to limitation of resources and increasing concerns about environment, reverse logistics has received growing attention in recent years. In this paper, we propose three types of reverse logistics networks based on reuse of returnable containers, materials recycling process and remanufacturing for parts reuse. First, the sender in the re-usable item network supplies containers for the recipient and orders either new containers from external supplier or returnable containers cleaned from the container depot. Second, the recycling center in the proposed recycling network collects either end of life products from customer or faulty goods from manufacturer, collected products are dismantled into materials and materials go into recycling process. Finally, the manufacturer in the proposed remanufacturing network has two alternatives for supplying parts: either ordering the required parts to external supplier or overhauling disassembled parts and bringing them back 'as new' conditions. In this product recovery environment, we build optimal order quantity models to minimize the total logistics costs related to reverse logistics network. The validity of the proposed model is investigated through comprehensive computational experiments.

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Experiences of nurses at a general hospital in Seoul which is temporarily closed due to COVID-19 (COVID-19 감염으로 임시 폐쇄된 서울 종합병원 간호사의 경험)

  • Jin, Dalrae;Lee, Gyuyoung
    • The Journal of Korean Academic Society of Nursing Education
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    • v.26 no.4
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    • pp.412-422
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    • 2020
  • Purpose: This study is aimed at preparing basic data to increase professionalism in nursing and effective counter-strategies against future infectious diseases. For that purpose, this study investigated the experiences of nurses in a general hospital with an 800-bed size, temporarily closed after a confirmed case of COVID-19. Methods: This study was a qualitative study using individual in-depth interviews, and data were collected from 10 nurses in a university hospital temporarily closed from May 1 to June 13, 2020. Results: As a result of this study, the subjects were classified into 'COVID-19 and nursing', 'nursing work and vocation' and 'life changed with COVID-19'. Conclusion: In conclusion, there is a need for education that nurtures the ability of nurses to screen patients with infectious diseases well and to skillfully wear and remove protective clothing. In addition, in order to cultivate the expertise of nurses and respond efficiently to infectious diseases, a separate compensation, such as a risk allowance, is required along with the establishment of an infrastructure that fully supports personnel and supplies. A mental health program to relieve stress is also required.

Design of Capable to Promise Using Lifetime Value (고객생애가치를 이용한 납기확약 모델 구현에 관한 연구)

  • 박재현;양광모;강경식
    • Journal of the Korea Safety Management & Science
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    • v.4 no.2
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    • pp.71-81
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    • 2002
  • Today's environment of enterprise is changing. They have to face customer' demands with the right product, the right service and supply them at the right time. And also cut down logistics and inventory cost and bring up the profit as much as they can. This means the change of putting enterprise first in importance to putting customer first importance. therefore to correspond to customer's demand, shorting lead time is becoming a essential condition. The answer to this changes of environment is supply chain management. In the Supply chain, The ATP function doesn't only give customers to conformation of delivery. It can be used by the core function with ATP rule that can reconcile supplies and demands on the supply chain. Therefore We can be acquire the conformation about on the due date of supplier by using the ATP function of management about real and concurrent access on the supply chain, also decide the affect about product availability due to forecasting or customer's orders through the ATP. In this paper, It consolidates the necessity on a CTP and analyzes data which is concerned of ATP. Under the these environments, defines the ATP rule that can improve the customer value and data flow related the LTV(Life Time Value) and builds on a algorithm.