• Title/Summary/Keyword: Test Environment

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Study About Characteristic of PVC Food Packaging (식품용 PVC 포장재 특성에 관한 연구)

  • Lee, Sun-Hee;Jung, Kyu-Jin;Lee, Yoong-Kook;Lim, Joung-Gyoon
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.14 no.2
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    • pp.53-56
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    • 2008
  • Polyvinylchloride(PVC) is variously used to produce food packaging, wrap film, sealing compound of drinking bottle cap. Safety of these PVC food package is controlled by Food Code, PVC regulation. This study was carried out researches on manufacture process, physical, chemical properties and monomer(CAS No., common name, molecular structure) of PVC to help the understanding of PVC material. Also, this study helps us the understanding of regulation through researches on the foundation of PVC regulation, the purpose of test and the comment of test method. It is considered that these informations of material properties and explanations of test method are very useful to PVC producers, users and analyzers of them.

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Effect of Nanomaterials on the Early Development of Fish Embryos: (1) Carbon and Other Nanomaterials (어류수정란 발달에 미치는 나노독성 연구동향: (1) 탄소계 및 기타 나노물질)

  • Shin, Yu-Jin;An, Youn-Joo
    • Journal of Korean Society on Water Environment
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    • v.28 no.5
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    • pp.762-767
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    • 2012
  • The ecotoxicity assessment of nanomaterials (NMs) in the environment is actively conducted throughout the world because of the concerns about their potential risk from usage and release into the environment, as well as their unique physiochemical properties. Ecotoxicity tests for NMs have been conducted using various species and methods; however, in spite of these efforts, the characteristics and toxicity of NMs have not been defined. The fish embryo toxicity test (FET) has been conducted extensively to evaluate the toxicity of NMs as an alternative to a whole-body test in fish. In this study, we collected and analyzed the trends of nanotoxicity on the early development of freshwater fish. The model nanomaterials are carbon NMs ($C_{60},\;C_{70},\;C_{60}$(OH)n and carbon nanotube). Their adverse effects were extensively investigated based on the properties of NMs, test species, and diverse exposure conditions.

Investigated Characteristics of H.T.P Test Responses According to Home Environment Variables (가정환경변인에 따른 아동의 H.T.P 검사 반응특성 연구)

  • Park, Sung-Ok;Kwon, Jung-Im
    • Korean Journal of Human Ecology
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    • v.8 no.1
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    • pp.15-27
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    • 1999
  • This study investigated characteristics of H.T.P test responses according to home environment variables. The subjects were 183 children in the fifth grade at an elementary school in Taejon. SAS was utilized in order to analyze data using x2 technique. The result of the study were as follows. The more home environment stimuli the children were provided by parents, the more stable in emotion they were. Especially four out of six home environment variables were found significant in helping children become emotionally stable, confident, well-adjusted, and high in achievement. These four variables were language stimulus, social maturity educational resources, and housing environment. It is concluded that children used to be provided with good home environment including language stimulus, social maturity, educational resource, housing environment, and plenty of family activities in order to become emotionally stable, confident, high in achievement, and adjustment.

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A Study on the Reliability Prediction about ECM of Packaging Substrate PCB by Using Accelerated Life Test (가속수명시험을 이용한 Packaging Substrate PCB의 ECM에 대한 신뢰성 예측에 관한 연구)

  • Kang, Dae-Joong;Lee, Hwa-Ki
    • Journal of the Korea Safety Management & Science
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    • v.15 no.1
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    • pp.109-120
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    • 2013
  • As information-oriented industry has been developed and electronic devices has come to be smaller, lighter, multifunctional, and high speed, the components used to the devices need to be much high density and should have find pattern due to high integration. Also, diverse reliability problems happen as user environment is getting harsher. For this reasons, establishing and securing products and components reliability comes to key factor in company's competitiveness. It makes accelerated test important to check product reliability in fast way. Out of fine pattern failure modes, failure of Electrochemical Migration(ECM) is kind of degradation of insulation resistance by electro-chemical reaction, which it comes to be accelerated by biased voltage in high temperature and high humidity environment. In this thesis, the accelerated life test for failure caused by ECM on fine pattern substrate, $20/20{\mu}m$ pattern width/space applied by Semi Additive Process, was performed, and through this test, the investigation of failure mechanism and the life-time prediction evaluation under actual user environment was implemented. The result of accelerated test has been compared and estimated with life distribution and life stress relatively by using Minitab software and its acceleration rate was also tested. Through estimated weibull distribution, B10 life has been estimated under 95% confidence level of failure data happened in each test conditions. And the life in actual usage environment has been predicted by using generalized Eyring model considering temperature and humidity by developing Arrhenius reaction rate theory, and acceleration factors by test conditions have been calculated.

Electromagnetic Environment Analysis of Goheung Aviation Center (고흥항공센터의 전기장 환경 분석)

  • Jang, Kyung-Duk;Kim, Tae-Youn;Jang, Jae-Woong;Min, Byong-Hee;Cho, In-Kyoung;Moon, Guee-Won
    • Aerospace Engineering and Technology
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    • v.12 no.1
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    • pp.46-53
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    • 2013
  • In this study, the analysis of electromagnetic environment of goheung aviation center was performed. If the test object has restrictions to be tested in indoor test facility, open area test site can be used to perform EMC test. Open area test site shall have no obstacles that can generate or reflect the electric field so as to prevent the measurement result from being influenced by unnecessary field. Goheung aviation center is surrounded by fields, and has no buildings that can reflect electric field, so the center can be a good candidate for open area test site. Ambient noise at Goheung aviation center was measured, and the result show that the center has good electromagnetic environment to perform EMC test for large volume object.

The Statistical Evaluation for the Wear Life of Brake Pad Linings in Vehicle Durability Test and Customer Usage Environment (차량내구시험과 시장 사용환경에서의 브레이크 패드 마찰재 마모수명에 대한 통계적 평가)

  • 서경원;정관영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.213-220
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    • 1999
  • The life data analysis of the system and component are useful to describe the result of reliability test in product life to satisfy customer's growing need and to change test specifications or design criteria by life data analysis. And vehicle durability tesr occurred market environment. In this study, a statistical analysis for the wear life of brake pad linings helped perform correlation procedure between vehicle durability test and market. B-life values of the brake pad wear life data from both vehicle durability test and marker usage were compared to determine acceleration of the test by the Weibull, normal and log-normal distribution. The acceleration coefficient of the vehicle durability test can access to evaluate design criteria of product and test specification.

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Distribution status survey of livestock Products Sold via Online Websites (온라인 축산물 유통 실태 조사)

  • Kim, Ji Yeon;Seo, Eun Ju;Koh, Ba Ra Da;Seo, Doo Ri;Jung, Bo Ram;Seo, Mi Hee;Lim, Jin Teak;Kim, Eun Sun;Kim, Yong Hwan
    • Korean Journal of Veterinary Service
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    • v.39 no.1
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    • pp.13-20
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    • 2016
  • This study is aimed to find out distribution status of online-market livestock products by purchasing and examining 120 cases of livestock products (seasoned meat: 17, 33 cases of packaged meat, 23 cases of ground meat, 19 cases of ham, 11 cases of sausage, 4 cases of bacon, 1 case of meat processing, 8 cases of Meat extract processed, and 4 cased of Dry storage of meat) at 17 On-line markets from April to August. 2015. We checked the weight of them first, and carried out ingredients test for each of processed meats. And we performed gene screening test on the products which were labelled 'Hanwoo' to investigate that the products were made of Korean native cattle. we also carried out test of identifying domestic animal species on ham, sausage and ground processed products. After weighing all products, we could know that all of them were delivered more than labelled weight or in allowable error. The result values of test which measured level of preservatives, Nitrite, Volatile Basic Nitrite (VBN), and tar Color by the type of processed meat products were in permissible range or not detected. Also, 17 beefs inspected Korean native cattle gene test were confirmed that they were made by real korean native cattle. But 2 cases of Ham, sausage, and ground processed products had difference between label and goods. In this study, we could make a decision that livestock products, distributed in On-line markets, were safe and expect to make higher degrees of hygiene for livestock products seller. Futhermore, we hoped result of this study could be used by basic data for progressive national policy decisions.

An Accelerated Life Test of Thermoelectric Module for Water Purifier (정수기 적용 열전모듈의 가속수명시험)

  • Moon, Ji Seob;Lee, Sung Min;Jeong, Seon Yong;Kim, Myung Soo
    • Journal of Applied Reliability
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    • v.14 no.1
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    • pp.21-28
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    • 2014
  • This paper presents an accelerated life test to estimate the lifetime of thermoelectric module for home water purifier. Clamping force and thermal cycle are selected as accelerating variables through the technical review about failure mechanism. It is assumed that its lifetime follows weibull distribution. The relationship, acceleration factor, and BP life at design condition are estimated by analyzing the accelerated life test data.

Development of Keypad Test System using PIC Controller (PIC Controller를 이용한 키패드 검사 시스템 개발)

  • Choi Kwang-Hoon;Lee Young-Choon;Kwon Tae-Kyu;Lee Seong-Cheol
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.10
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    • pp.94-101
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    • 2004
  • This paper presents the development of a keypad test system for the improvement of working environment and productivity using PTC 16F877 microprocessor. In order to detect the fault of keypad products, hardware and software design is performed in this system. Keypad fault detection system is controlled by the 8 bit one chip PIC microcontroller for the exactness and speed. Developed panel of the keypad test system is comprised of the sub-panel for selecting in the inspected keypad types and the main panel f3r displaying the working order and fault position. Furthermore, all data from keypad inspection are stored in main memory of personal computer for the database. All these functions lead to the improvement of working speed and environment.

Test of Vision Stabilizer for Unmanned Vehicle Using Virtual Environment and 6 Axis Motion Simulator (가상 환경 및 6축 모션 시뮬레이터를 이용한 무인차량 영상 안정화 장치 시험)

  • Kim, Sunwoo;Ki, Sun-Ock;Kim, Sung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.2
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    • pp.227-233
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    • 2015
  • In this study, an indoor test environment was developed for studying the vision stabilizer of an unmanned vehicle, using a virtual environment and a 6-axis motion simulator. The real driving environment was replaced by a virtual environment based on the Aberdeen Proving Ground bump test course for military tank testing. The vehicle motion was reproduced by a 6-axis motion simulator. Virtual reality driving courses were displayed in front of the vision stabilizer, which was located on the top of the motion simulator. The performance of the stabilizer was investigated by checking the image of the camera, and the pitch and roll angles of the stabilizer captured by the IMU sensor of the camera.