• Title/Summary/Keyword: life testing

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Problems and Development of Police Officials' Physical Fitness Tests (경찰공무원 체력검정의 문제점 및 발전방안)

  • Kim, Sang-Woon
    • The Journal of the Korea Contents Association
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    • v.19 no.8
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    • pp.609-619
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    • 2019
  • The study aims to present a solution to the problem of police physical fitness tests as police officers, who tried to subdue the drunk in a video clip titled "Darim-dong female police officer Assault" in May in Seoul, showed a rather lethargic figure, such as being pushed out of a physical fight with the suspect. The police physical fitness test is subject to criticism as it consists of items that are difficult to apply in real life despite having to be linked to job performance. The problem is that the physical fitness test events are not realistic, the physical fitness test standards are set too low, and their credibility is not reliable due to the imbalance of standards between men and women and the vision culture of physical fitness testing methods. First of all, we hope that the Republic of Korea will become a world-class security powerhouse by upgrading its physical fitness standards and establishing a scientific fitness test system for preventing injuries and effectively measuring physical strength.

A Study on Fire Detection in Ship Engine Rooms Using Convolutional Neural Network (합성곱 신경망을 이용한 선박 기관실에서의 화재 검출에 관한 연구)

  • Park, Kyung-Min;Bae, Cherl-O
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.4
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    • pp.476-481
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    • 2019
  • Early detection of fire is an important measure for minimizing the loss of life and property damage. However, fire and smoke need to be simultaneously detected. In this context, numerous studies have been conducted on image-based fire detection. Conventional fire detection methods are compute-intensive and comprise several algorithms for extracting the flame and smoke characteristics. Hence, deep learning algorithms and convolution neural networks can be alternatively employed for fire detection. In this study, recorded image data of fire in a ship engine room were analyzed. The flame and smoke characteristics were extracted from the outer box, and the YOLO (You Only Look Once) convolutional neural network algorithm was subsequently employed for learning and testing. Experimental results were evaluated with respect to three attributes, namely detection rate, error rate, and accuracy. The respective values of detection rate, error rate, and accuracy are found to be 0.994, 0.011, and 0.998 for the flame, 0.978, 0.021, and 0.978 for the smoke, and the calculation time is found to be 0.009 s.

Speech Perception and Language Outcome in Congenitally Deaf Children Receiving Cochlear Implants in the First Year of Life (생후 12개월 이전에 인공와우이식을 받은 선천성 농 아동의 말지각과 언어능력)

  • Jeong, Sung Wook;Seo, Ji-Won;Boo, Sung-Hyun;Kim, Lee-Suk
    • Korean Journal of Otorhinolaryngology-Head and Neck Surgery
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    • v.61 no.12
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    • pp.644-649
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    • 2018
  • Background and Objectives The objective of this study was to examine the effect of early cochlear implantation (CI) performed in infants less than 12 months of age. Subjects and Method Twenty-five children who received their first CI before 12 months of age were included in this study (infant group). The speech perception and language outcomes of these children were compared with those of 14 children who received their first CI between 13 and 24 months of age (older group). All children received sequential bilateral CI with the inter-stage interval of less than 2 years. Speech perception was measured using Categories of Auditory Performance, monosyllabic word test and sentence test, and language ability was measured using Sequenced Language Scale for Infants, Preschool Receptive-Expressive Language Scale, or Receptive & Expressive Vocavulary Test, depending on the age at the time of testing. Results There were no significant differences in speech perception abilities between the infant group and the older group. The mean expressive language score of infant group was higher than that of the older group, but the difference was not statistically significant. However, the receptive language score of infant group was significantly higher than that of the older group. Conclusion Children who received CI before 12 months of age achieved better receptive language ability than those who received it after 12 months of age. Thus CI should be performed as early as before 12 months of age to achieve better language ability.

Case study: application of NAT (New Abrasion Tester) for predicting TBM disc cutter wear and comparison with conventional methods (TBM 디스크 커터 마모 예측에 대한 NAT의 현장 적용 및 기존 방법과의 비교)

  • Kim, Dae-Young;Shin, Young-Jin;Jung, Jae-Hoon;Kang, Han-Byul
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.6
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    • pp.1091-1104
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    • 2018
  • Wear prediction of TBM disc cutters is a very important issue during design as well as construction stages for hard rock TBMs as the cutter head intervention is directly related to the time and cost of tunneling. For that, some methods such as NTNU, CSM and Gehring models were used to predict disc cutter wear and intervention interval. There are however some problems to be addressed in these models in terms of accuracy and time for testing, so that a NAT (New Abrasion Tester) model has been developed in order to achieve simplicity and reliability together at the same time (Farrokh and Kim, 2018). On the basis, the proposed NAT model has been applied to ${\bigcirc}{\bigcirc}$ project in Korea. A comparative study was performed to compare with the conventional methods and as a result the NAT model showed a very good agreement with actual cutter life. The NAT model will be further applied to other projects to establish credibility.

Durability Evaluation of Gangway Ring for the Articulated Bogie of High speed Railway Vehicle (고속철도차량 관절대차 갱웨이 링의 내구성 평가)

  • Kang, Gil-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.66-72
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    • 2019
  • To improve ride quality and running stability of high speed train(HST), it is important that connection between coaches adopts the articulated bogies by using a gangway ring, unlike the conventional independent bogies assembled with car bodies. Although the gangway ring should be ensured absolute safety against passenger movement between coaches during train operation, there is still a lack of quantitative durability criteria of that. Therefore, in order to improve the passenger safety of HST, it is important to study the test requirements on durability evaluation for the ring. In this study, seven mixed loading cases were derived from the triaxial loading(vertical/lateral/longitudinal) modes. The safety factor of each component is at least 2.4 or more from the results of the finite element analysis. In addition, fatigue safety was evaluated through durability analysis from the viewpoint of strain-life design. Durability tests for the gangway ring carried out a total of 10 million cycles in 4 phases load conditions. After the durability test, the defect of each component was investigated using nondestructive testing techniques.

Goodness of Fit Tests for the Exponential Distribution based on Multiply Progressive Censored Data (다중 점진적 중도절단에서 지수분포의 적합도 검정)

  • Yun, Hyejeong;Lee, Kyeongjun
    • Journal of the Korean Data Analysis Society
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    • v.20 no.6
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    • pp.2813-2827
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    • 2018
  • Progressive censoring schemes have become quite popular in reliability study. Under progressive censored data, however, some units can be failed between two points of observation with exact times of failure of these units unobserved. For example, loss may arise in life-testing experiments when the failure times of some units were not observed due to mechanical or experimental difficulties. Therefore, multiply progressive censoring scheme was introduced. So, we derives a maximum likelihood estimator of the parameter of exponential distribution. And we introduced the goodness-of-fit test statistics using order statistic and Lorenz curve. We carried out Monte Carlo simulation to compare the proposed test statistics. In addition, real data set have been analysed. In Weibull and chi-squared distributions, the test statistics using Lorenz curve are more powerful than test statistics using order statistics.

A Study on the Test Device for Improving Test Speed and Repeat Precision of Semiconductor Test Socket (반도체 테스트 소켓의 검사속도 및 반복 정밀도 개선형 검사장치에 관한 연구)

  • Park, Hyoung-Keun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.327-332
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    • 2021
  • At the package level, semiconductor reliability inspections involves mounting a semiconductor chip package on a test socket. The form of the test socket is basically determined by the form of the chip package. It also acts as a medium to connect with test equipment through mechanical contact of the leads and socket leads in the chip package, and it minimizes signal loss in a signal transmission process so that an inspection signal can be delivered well to the semiconductor. In this study, a technique was applied to examine the interdependence of adjacent electrical transfer routes and the structure of adjacent electrical transfer paths. The goal was to enable short-circuit testing of fewer than 100 silicon test sockets through a single interface for life tests and precision measurements. The test results of the developed device show a test precision of 99% or more and a simultaneous test speed characteristic of 0.66 sec or less.

Academic Procrastination As A Challenge For Students' Mental Health In The Context Of Distance Learning And The Virtual World During The Covid-19 Pandemic

  • Stoliarchuk, Olesia;Khrypko, Svitlana;Olga, Dobrodum;Ishchuk, Olena;Kokhanova, Olena;Sorokina, Olena;Salata, Karina
    • International Journal of Computer Science & Network Security
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    • v.22 no.3
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    • pp.276-284
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    • 2022
  • The research aims to study the dynamics of academic procrastination and its impact on the mental health of students during the transition to distance learning during the COVID-19 pandemic. At the beginning of the COVID-19 pandemic, it was identified a declining tendency of overall rates of academic procrastination and at the same time increase in the number of carriers of mid and high levels of academic procrastination. The decline in the general rates of academic procrastination at the beginning of 2021 testifies to the adaptation processes experienced by students to the conditions of distance learning. It was documented that students' academic procrastination is accompanied by a steady negative emotional tension. During the transition to distance learning, the intensity of students' learning activity has increased, which altogether causes stress as one of the main reasons for the academic procrastination among future psychologists. The study identified a risk of academic procrastination manifestation among students for their mental health, which provides a basis for developing and testing a program to prevent the phenomenon of academic procrastination among degree-seeking students.

Safety and antifatigue effect of Korean Red Ginseng capsule: A randomized, double-blind and placebo-controlled clinical trial

  • Yang, Yi;Wang, Hong;Zhang, Ming;Shi, Mengxue;Yang, Cailing;Ni, Qiang;Wang, Qi;Li, Jing;Wang, Xuemei;Zhang, Chen;Li, Zhi
    • Journal of Ginseng Research
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    • v.46 no.4
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    • pp.543-549
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    • 2022
  • Background: In physical activity or labor, the human body is in a state of high intensity stress, and all parts or physiological functions of the body respond positively to maintain or balance the need for movement. The human body has many physiological changes in the process of movement, and fatigue is the external manifestation of various complex changes inside the human body. Fatigue is also a physiological mechanism of self-protection after the body reaches a certain level of activity, which can prevent the occurrence of life-threatening excessive functional failure. The generation of fatigue is a very complex process, and its mechanism has not been concluded yet. Therefore, it is an important work to search and screen the effective components of natural plants that have anti-fatigue effect and to explore their mechanism. Methods: This was a 8-week, randomized, double-blind, placebo-controlled clinical trial. A total of 110 subjects who passed physical examination were included according to the scheme design, and randomly divided into a test group which was given KRG and a placebo control group. The calculation is carried out according to the standard of sub-high-intensity exercise test. Results: There was no adverse effect on safety index of subjects after taking red ginseng capsule. After KRG treatment, subjective strength grade is significant lower than placebo treatment. Blood lactic acid content is significantly get lower after trial in KRG group, and significant lower than placebo group. Creatine phosphokinase(CK) content is significantly get lower after trial in KRG group, and significant lower than placebo group. Conclusion: According to the criterion in the test scheme, the result shows that KRG is helpful on relieving physical fatigue.

Feasibility Study of a Corrugated Steel Protective Structure for Ammunition Test Facility (탄약시험장의 강재 방호구조물 적용성 분석 연구)

  • Han, Jae Duk;Kim, Donghee;Kim, Sungkon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.5
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    • pp.671-679
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    • 2022
  • Harmful factors such as shock waves and fragments are generated at domestic ammunition testing sites and military shell shooting training sites due to frequent shooting and explosion tests. As a result, complaints from local residents are rapidly increasing, and there is a high risk of damage to facilities and human life. The recently constructed ammunition test site built a test facility for firing artillery and rocket propulsion in a narrow area with a radius of 300 m due to site restrictions, but damage to the facility is accumulating because there is no adequate protective structure. Therefore, in this study, quantitative data on harmful factors such as noise, vibration, shock wave, and thermal effect generated between artillery firing and rocket propulsion tests were measured, and explosion pressure characteristics were analyzed to design a protective structure, and use Autodyn to protect performance. to perform verification.