• Title/Summary/Keyword: Inspection station

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A Study on Proper Station Spacing in Urban Railway (도시철도에서의 적정 역간거리에 관한 연구)

  • Kim, Gang-Seog;Sung, Ki-Han;Lim, Young-Su
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.766-771
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    • 2006
  • Railway stations are important facilities for transport of passengers and freights. The location of station have an effect on the efficiency of railway transport and operation. In this study, an inspection of the primary factors for station spacing in urban railway has been performed and a review for the propriety of the present states and further improvement has been carried. It may be helpful for proper decisions on the route planning in urban railway. Primary factors for station spacing are 1)train capacity, 2)competitiveness with other transportation, 3)accessibility and 4)construction cost, which is out of consideration in the inspection. From the result of this study, the proper station spacing is about 600m for the accessibility, more over 1.03km for the train capacity and more over 1.4km for the competitiveness with other transportation.

The Allocation of Inspection Efforts Using a Knowledge Based System

  • Kang, Kyong-sik;Stylianides, Christodoulos;La, Seung-houn
    • Journal of Korean Society for Quality Management
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    • v.18 no.2
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    • pp.18-24
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    • 1990
  • The location of inspection stations is a significant component of production systems. In this paper, a prototype expert system is designed for deciding the optimal location of inspection stations. The production system is defined as a single channel of n serial operation stations. The potential inspection station can be located after any of the operation stations. Nonconforming units are generated from a compound binomial distribution with known parameters at any given operation station. Traditionally Dynamic programming, Zero-one integer programming, or Non-linear programming techniques are used to solve this problem. However a problem with these techniques is that the computation time becomes prohibitively large when t be number of potential inspection stations are fifteen or more. An expert system has the potential to solve this problem using a rule-based system to determine the near optimal location of inspection stations. This prototype expert system is divided into a static database, a dynamic database and a knowledge base. Based on defined production systems, the sophisticated rules are generated by the simulator as a part of the knowledge base. A generate-and-test inference mechanism is utilized to search the solution space by applying appropriate symbolic and quantitative rules based on input data. The goal of the system is to determine the location of inspection stations while minimizing total cost.

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A Study on 5G Base Station Inspection using 8T8R Combiner (8T8R콤바이너를 이용한 5G 무선국 검사에 관한 연구)

  • Lee, Chang-Soo;You, Chan-Woo;Park, Sung-Il
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.2
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    • pp.229-236
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    • 2022
  • This article studied the radio station inspection method, which utilizes the 8T8R combiner to reduce 5G radio station inspection measurement times. It is a common that 5G radio station inspections measure RF (Radio Frequency) output signals, which correspond to the number of arrayed antennas individually. However, this study suggested a way to save the time spent on existing methods, by comparing measurement values of individual channels and 8T8R. As a result, it is confirmed that when the 8T8R combiner is used, not only the resulting value of radio station inspections was accurate, but also the measurement time being shortened by up to 8 times compared to existing method.

TV용 패널 검사대 최적조명설계에 관한 연구

  • 조항준;김성환;정의승
    • Proceedings of the ESK Conference
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    • 1995.04a
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    • pp.3-14
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    • 1995
  • To investigate the effect of illumination conditions on visual inspection performance for TV panel glasses, three dependent variables, inspection time, error, and preference , were measured and analyzed through two consecutive experiments. The first experiment for reflection inspection was conducted using two independent variables, position and brightness. The second experiment for transparent inspection was made using two independent variables, height and brightness. The summary of the results of the experiment for reflection inspection are as follows ; The inspection performance of the position right above the subject (Position 1) was the best among the conditions in terms of errors, while the performance of the position slightly in front of and above the subject(Position 2) was the best in terms of inspection times. Inspection time was statistically different according to the brightness conditions specifically at the position in front of the subject(Position 3). The results of the second experimen for transparent inspection are that the inspection performance at medium height (Height 2) was the best among the three conditions in terms of errors while the performance at lower height(Height 3) was the best in subject preference. Based upon both results with respect to actual field conditions, two alternative inspection station designs were proposed for each lighting conditon.

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Discrimination of Geographical Origin and Seed Content in Red Pepper Powder by Near Infrared Reflectance Spectroscopic Analysis (근적외선 분광분석법에 의한 고춧가루의 원산지 및 고추씨 혼입 판별)

  • Kwon, Hye-Soon;Lee, Nam-Yun;Kim, Soo-Jung;Chung, Seung-Sung;Kim, Joong-Hwan
    • Journal of the Korean Applied Science and Technology
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    • v.16 no.2
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    • pp.155-161
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    • 1999
  • Red pepper powder (Capsicum annum L.) is an important seasoning as a kimchi ingredient in korea and most korean consumer tend to eat the korean red pepper powder as the better than other oriental country such as China. Near infrared reflectance spectroscopy (NIRS) was applied for discrimination according to geographical origin (Korea, China) of red pepper powder. The objective of this study is to determine if NIR technique could be used to discriminate between the korean red pepper powder and non-korean red pepper powder according to seed content and maxing ratio in red pepper powder by using the new method. Rapid, precise and nondestructive analysis method for determination of the geographical origin of red pepper powder by near infrared spectroscopy and chemometrics were performed. It has been observed discriminant analysis with PLS is adequate to determinate the geographical origin of red pepper powder. It tend to difficult the discrimination of geographical origin according to increase the seed content of red pepper powder. The accuracy of discrimination in mixed red pepper powder was range from 95.2% to 100%.

Survey of Japan's Radio Management System (일본의 전파관리제도에 대한 조사)

  • Kim, Sung-Hong;Seok, Gyeong-Hyu
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.1
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    • pp.1-8
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    • 2018
  • It is the content and scope of this study to analyze the problems of the current wireless service and the classification system of the radio station, and to examine the case of radio control in Japan and to establish a reasonable and efficient radio wave management plan. The results of this study can be used as basic data for reorganizing the legislation on radio wave enforcement ordinance, radio services and radio station classification standards. It is expected that it will be possible to improve the compliance and efficiency of the radio station licensing and inspection service while enhancing the policy compliance in the practical work by providing detailed explanations on the definition and classification system of the new radio task / radio station in the future.

Seismic Resistance Response of Railway Station Building Retrofitted by Metallic Dampers (강재댐퍼를 적용한 역사 건물의 내진 응답)

  • Lee, Hyun-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.2
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    • pp.82-88
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    • 2010
  • The purpose of this research is a seismic capacity evaluation and strengthening of existing railway station buildings, which were constructed before the seismic design code activated. The seismic capacity of 2nd story RC station building is evaluated by using nonlinear time-history analysis. Analysis results are checked by story drift ratio and story shear, which are described in design code. As a result, the story shears are exceeding the base shear of the design code, the appropriate seismic strengthening methods are needed. To improve the seismic capacity, metallic dampers are used. Evaluation parameters are metallic damper shape and damper installation methods. Dampers are installed in four places in X and Y directions of station buildings. By reviewing of time-history analysis results, the metallic damper, which is installed inverted K-brace type, shows a better seismic performance than other damper shape and installation methods.

Inspeciton for Ground Settlement and Its Contermeasurement Under ${\bigcirc}{\bigcirc}$-Station Passenger Way Adjacent to Ground Excavation (${\bigcirc}{\bigcirc}$역사 지하철 환승통로 주변지반 침하 원인 및 대책에 관한 연구)

  • Yoon, Tae-Gook;Choo, Jin-Ho;Kim, Hong-Kyun;Ko, Hee-Kyu;Han, Dong-Eun
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.2879-2884
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    • 2011
  • Ground settlement has been occurred at asphalt pavement above ${\bigcirc}{\bigcirc}$ station passenger way adjacent to ground excavation with SPS method. In this study, emergency inspection has been conducted 4 detailed areas by KISTEC; SPS, sewage box, 50m box in subway, and ${\bigcirc}{\bigcirc}$ station. Field description and previous reports have been analyzed with the elapsed years. Not only precise inspection with several NDTs but also stability analysis by FLAC have been performed to estimated the tendency of settlement at sunk pavement area. Additional monitoring system and water analysis from sewage and SPS have been examined to scrutinize the reason and maintenance for settlement.

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A Study on Stability of Middle Slabs supporting Train Loads in Subway Station (열차하중을 지지하는 지하철정거장 중간슬래브의 안정성 연구)

  • Woo, Jong-Tae;Yhim, Sung-Soon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.3 no.3
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    • pp.195-202
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    • 1999
  • This study present the stability of middle slabs directly supporting train loads in the subway station. According to results of Quality confirmation, mixing and curing conditions are good. But, when effects of hydration heat are analyzed, cracks seems to take place because tensile stress is higher than tensile strength in several points of middle slabs. It is found that vibration by train running don't have an effect on cracks in the structure. The structural analysis shows that there is no problem on the stability of structural body, but the design through 3-dimensional analysis is need to consider columns and opening specially in the subway station structures.

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