• Title/Summary/Keyword: mileage

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A Study on Mission Profile and Determination of Durability Test Parameters in the Hydraulic Clutch System (Hydraulic Clutch System의 Mission Profile 및 내구시험모수 결정에 관한 연구)

  • Lee, Sang-Cheon;Hur, Man-Dae;Lee, Chun-Gon;Kim, Jae-Young;Kang, Ji-Woo;Lee, Hong-Bum;So, Yoon-Sub;Lee, Jong-Hyung;Min, Byung-Gil;Lee, Jae-Yul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.5
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    • pp.521-528
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    • 2009
  • One of reliability measurements of vehicle is estimated by driving mileage but the reliability of component, such as an hydraulic clutch system, is defined from the number of successful operational cycle. Relationship between these reliability measurement variables(mileage and cycle) should be examined first of all in the reliability estimation of components. Relationship between mileage and cycles is commonly known as linear function. However, the gradient depends on the operational environmental condition. Therefore, estimation of mission profile variable should be done with correlation analysis at the same time. In this paper, we derive mission profile variable of an hydraulic clutch system by field vehicle test and suggest the determination process of durability test parameters of CMC(Clutch Master Cylinder) with mission profile variable.

Vehicle Maintenance Support System using CAN Communication (CAN 통신을 이용한 자동차 유지관리 지원 시스템)

  • Jiwon, Park;Seunghong, Han;Jaehyun, Park
    • Journal of Korea Society of Industrial Information Systems
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    • v.27 no.6
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    • pp.59-68
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    • 2022
  • We propose the vehicle maintenance support system to alarm consumable replacement reminders to the vehicle owner. Since the delayed replacement of the consumables makes the condition of the vehicle worse, it is crucial to replace consumables in a recommended period. The vehicle maintenance support system alarms the replacement time, which is set by the vehicle owner, based on the mileage of the installed vehicle. It integrates speed information acquired from the Controller Area Network interface for communication between Electronic Control Unit and instrument panel, exposed at the On Board Diagnostics-II port, to calculate the vehicle mileage. By this, there is no additional wiring required for the system. We verify the system has only 0.28% error by comparing the mileage on the system with the instrument cluster on the vehicle. It automatically enters low-power mode consuming 15mW, which is a negligible amount for the typical conditions of the car, to prevent the vehicle battery from discharging when the ignition is off.

Emission Rates Estimation by Vehicle Type in Seoul Using the Vehicle Inspection Data (차량 검사 데이터를 활용한 서울시 자동차 유형별 배출 가스량 원단위 산정)

  • Lee, Hyosun;Han, Yohee;Park, Shin Hyoung;Hwang, Ho Hyun;Kim, Youngchan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.20 no.6
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    • pp.177-191
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    • 2021
  • One of the major causes of serious air pollution worldwide is emissions from road transportation. A number of countries are working to reduce vehicle emissions, and the Seoul Metropolitan Government is also implementing active policies to reduce emissions by setting a target of 40% by 2030. Implementing these policies requires the introduction of practical indicators. Most of the domestic emissions are calculated by the emission coefficient, a function of speed at the National Institute of Environmental Research under the Ministry of Environment, but the dynamic variable speed is limited to being used as an indicator of the number of eco-friendly vehicles. Therefore, this study calculated the emission rates in Seoul using the vehicle registration data of Seoul and the vehicle inspection data from the Korea Transportation Safety Authority. The tendency of emissions was determined according to key variables such as vehicle type, fuel and mileage. Emissions were based on carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter measured by vehicle inspection from the Korea Transportation Safety Authority. As a result, the emission rates showed a significant trend according to the model year and mileage. This can be used as a policy indicator to preferentially switch commercial vehicles with old model years and long mileage when switching eco-friendly vehicles in Seoul.

Development and Evaluation of the Elderly Health Mileage Program to Promote Exercise

  • June, Kyung Ja;Kim, Hee Gerl;Park, Bohyun
    • Journal of Korean Public Health Nursing
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    • v.31 no.3
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    • pp.567-581
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    • 2017
  • Purpose: The purpose of this study was to develop a Health Mileage Program (EHMP) to promote exercise amongst the elderly and assess the feasibility of the program. Methods: A literature review to identify the effects of exercise in the elderly was conducted. Relevant cases were investigated and in-depth interviews with exercise instructors were conducted, after which the EHMP was developed based on the assessment and tested in three regions. The outcome was evaluated using indicators such as attendance rate, number of participants, proportion of participants who received health education, and proportion of participants who measured their physical and mental status. Results: Based on assessment, we developed an EHMP composed of four steps. Following application of the EHMP in three regions, ${\geq}80%$ of the participants received incentives. Additionally, ${\geq}85%$ of participants underwent measurement of their physical and mental status. The proportion of participants who received health education differed among regions. Conclusion: The EHMP program increased participation and interest in exercise programs for the elderly. However, there is concern regarding availability due to regional differences in resources related to elderly exercise; therefore, it will be necessary to invest in infrastructure, including facilities, and knowledgeable instructors.

Development of a Simulation Model based on CAN Data for Small Electric Vehicle (소형 전기자동차 CAN 데이터 기반의 시뮬레이션 모델 개발)

  • Lee, Hongjin;Cha, Junepyo
    • Journal of ILASS-Korea
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    • v.27 no.3
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    • pp.155-160
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    • 2022
  • Recently, major developed countries have strengthened automobile fuel efficiency regulations and carbon dioxide emission allowance standards to curb climate change caused by global warming worldwide. Accordingly, research and manufacturing on electric vehicles that do not emit pollutants during actual driving on the road are being conducted. Several automobile companies are producing and testing electric vehicles to commercialize them, but it takes a lot of manpower and time to test and evaluate mass-produced electric vehicles with driving mileage of more than 300km on a per-charge. Therefore, in order to reduce this, a simulation model was developed in this study. This study used vehicle information and MCT speed profile of small electric vehicle as basic data. It was developed by applying Simulink, which models the system in a block diagram method using MATLAB software. Based on the vehicle dynamics, the simulation model consisted of major components of electric vehicles such as motor, battery, wheel/tire, brake, and acceleration. Through the development model, the amount of change in battery SOC and the mileage during driving were calculated. For verification, battery SOC data and vehicle speed data were compared and analyzed using CAN communication during the chassis dynamometer test. In addition, the reliability of the simulation model was confirmed through an analysis of the correlation between the result data and the data acquired through CAN communication.

Optimal Design of Guide Vane for Improvement of Heat Removal Performance of Electric Vehicles Battery Using Genetic Algorithm (유전 알고리즘을 활용한 전기 자동차 배터리 방열성능 향상을 위한 가이드 베인 최적설계)

  • Song, Ji-Hun;Kim, Youn-Jea
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.1
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    • pp.55-61
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    • 2022
  • Along with global environmental issues, the size of the electric vehicle market has recently skyrocketed. Various efforts have been made to extend mileage, one of the biggest problems of the electric vehicles, and development of batteries with high energy densities has led to exponential growth in mileage and performance. However, proper thermal management is essential because these high-performance batteries are affected by continuous heat generation and can cause fires due to thermal runaway phenomena. Therefore, thermal management of the battery is studied through the optimal design of the guide vanes, while utilizing the existing battery casing to ensure the safety of the electric vehicles. A battery from T-company, one of a manufacturer of the electric vehicles, was used for the research, and the commercial CFD software, ANSYS CFX V20.2, was used for analysis. The guide vanes were derived through optimal design based on a genetic algorithm with flow analysis. The optimized guide vanes show improved heat removal performance.

Consumer Attitudes toward the Sales Promotions of Retail Apparel Stores With Respect to Purchase Intention (의류 소매점의 판매촉진에 대한 소비자 태도와 구매의도)

  • Kyung, Moon-Soo;Hwang, Choon-Sup
    • Journal of Distribution Science
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    • v.13 no.3
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    • pp.51-60
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    • 2015
  • Purpose - Among potential marketing strategies, the most efficient method to encourage purchase intention is through sales promotions. Sales promotions also serve to enhance customer satisfaction, which is closely related to the incidence of repurchases. Therefore, the success of retail stores greatly depends on the effectiveness of their promotional activities. The present study aimed to obtain the necessary information for apparel stores to establish more effective promotional activities. To this end, the study's specific research questions were to examine 1) consumer satisfaction with the recent sales promotions of retail apparel stores, 2) the levels of consumer preferences for different types of sales promotions (cash discounts, promotional gifts, prize drawings, discount coupons, stamp cards, or mileage cards), and 3) the differences in purchase intention according to preference levels for different types of sales promotions. Research design, data, and methodology - The research employed a descriptive survey method using a self-administered questionnaire. The sample consisted of 700 men (n=234) and women (n=466) ranging in age from their 20s to their 50s and residing in the Seoul area. Data were analyzed through methods including factor analysis as well as Cronbach's α coefficients, the t-test, ANOVA, and the Duncan test. Results - Differences among consumer preferences were identified for each type of sales promotion according to the purchase amount and the customer's age. In relation to purchase amounts below 500,000 won, participants in their 50s have lower preferences for price discounts than those in their 20s or 30s, whereas participants in their 40s or 50s have lower preferences for stamp cards and mileage cards than those in their 20s. When the purchase amount is greater than 500,000 won, housewives have higher preferences for promotional gifts than respondents with other occupations. However, no gender differences were found with regard to preference levels for the different types of sales promotions. Respondents generally exhibited mediocre satisfaction with the sales promotion events of retail apparel stores. They also expressed negative opinions about sales promotions when such promotions lead to high prices, as well as dissatisfaction with the poor quality of promotional gifts. It was also found that, regardless of the purchase amount, the groups with higher preferences for discount coupons and mileage cards displayed higher purchase intentions. Only when the purchase amount is greater than 200,000 won did the group with higher preferences for lottery system promotional gifts express higher purchase intentions. On the other hand, for all purchase amount sizes, there were no differences in purchase intentions according to preferences for cash discounts, promotional gifts, or stamp cards. Conclusions - The results revealed that greater effort must be devoted to enhancing consumers' satisfaction levels with the promotional activities performed by apparel retail stores. The results also showed that it is necessary to differentiate among sales promotion strategies according to preference levels for different types of sales promotions, purchase amounts, and target consumer ages.

A Comparative Study of After Entering College Freshman's Life Based on Their Different University Admission Types (대학입학전형유형별 신입생의 입학 후 대학생활 비교 연구 -K대학 사례분석-)

  • Yang, Eun-Mok;Seo, Chang-Ho;Hong, Do-Won;Kim, Jong-Hun
    • Journal of Digital Convergence
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    • v.14 no.4
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    • pp.437-448
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    • 2016
  • The study conducted Comparative Analysis on the difference of College Scholastic Ability Data divided by type of admission process through the mileage program. Analysis result in following sequence. Leadership and relationships : CSAT(CSAT) > TOSR(subject), CSAT(CSAT+TOSR) is lower than each types ; mainly TOSR(total), TOSR(subject), CSAT(CSAT). Global : CSAT(CSAT+TOSR) & CSAT(CSAT) is higher than mainly TOSR(total) & TOSR(subject). Career and job search : TOSR(total) & TOSR(subject) is higher than mainly CSAT(CSAT+TOSR). Sum of mileage score : CSAT(CSAT) is higher than TOSR(subject) & CSAT(CSAT). Given this as a result, If you look simply at the activities of joint participation of leadership and relationships, student of mainly TOSR(total) admission do well college life with existing research. But with analysis results of K-Leader mileage this research shows that students of mainly CSAT(CSAT) admission do well college life. * CSAT(College Scholastic Ability Test), TOSR(a transcript of school records)