• Title/Summary/Keyword: IT Infrastructure

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Study on Seismic Evaluation of Racking Response of Underground Utility Tunnels with a Rectangular Cross Section in Korea (국내 박스형 공동구의 횡방향 지진 변위응답 평가에 대한 고찰)

  • Kim, Dae-Hwan;Lim, Youngwoo;Chung, Yon Ha ;Lee, Hyerin
    • Journal of the Korean Geotechnical Society
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    • v.38 no.12
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    • pp.29-43
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    • 2022
  • Various underground facilities are being constructed to improve the urban environment. Therefore, it is more necessary than ever to reasonably evaluate the seismic response of underground utility tunnels, playing a significant part in urban infrastructure. In this study, the major features and differences of two types of existing pseudo-static analysis methods are reviewed. Each method uses a simplified 2D frame model to represent the seismic behavior of underground structures. Applying each method to a one-barrel rectangular utility tunnel in Korea, the suitability in predicting seismic responses, especially the racking deformation of the tunnel, is examined. In addition, several precautions and suggestions are provided in this study against the inattentive application of the methods to seismic evaluation of underground structures.

A Study on the Establishment of a New Quarantine System in the COVID-19 Era

  • Tae Gyu, Yu;Hwa Jung, Lee
    • International Journal of Internet, Broadcasting and Communication
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    • v.15 no.1
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    • pp.275-280
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    • 2023
  • Currently, the cumulative number of confirmed cases from the coronavirus in Korea is 30.17 million, and the cumulative number of deaths also reaches 33,444 (as of January 31, 2023). Therefore, this study aims to conduct an empirical analysis on the establishment of quarantine systems in major domestic cities as it is necessary to analyze the influencing factors of COVID-19 and discuss policy directions necessary to establish an effective quarantine system in the future. Among them, 16 cities in Korea with a relatively weak quarantine infrastructure were compared with the interrelationship between "number of upper-level hospitals", "number of urban populations", "number of infected", and "number of deaths", and ultimately the results of quarantine for each local government. In conclusion, the average population of 16 cities is 0.792 million, and the average number of infected people is 0.458 million, and the average cumulative infection rate is 57.8%. Seven cities exceed the average cumulative infection rate: Suwon (61.6%), Yongin (59.1%), Seongnam (61.8%), Hwaseong (65.6%), Anyang (60.7%), Cheonan (62.9%), and Jeonju (62.9%). In addition, despite the establishment of excellent treatment facilities in the city (ave=0.0129), the ratio of "accumulated deaths" (ave=0.11%) was high in Changwon (0.12%/0.0193), Ansan (0.12%/0.0138), Cheongju (0.11%/0.0174), and the ratio of "accumulative deaths" was low (0.09%) despite the construction of relatively poor treatment facilities. Through the results of this study, we expect a paradigm shift in the infectious disease management system in major cities in Korea after post-COVID-19.

Cognitive Training Protocol Design and System Implementation using AR (증강현실을 이용한 인지훈련 프로토콜 설계 및 시스템 구현)

  • Cheol-Seung, Lee;Kuk-Se, Kim
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.6
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    • pp.1207-1212
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    • 2022
  • Realistic media, the next-generation media technology in the era of the 4th industrial revolution, is becoming an issue as a technology to experience through an environment that optimizes user experience, especially! It is rapidly developing into the health and healthcare convergence and complex fields. Realistic media technologies and services are being adopted to solve the problems of the increase in chronic diseases due to the increase in the elderly population and the lack of infrastructure and professional manpower in the fields of cognitive training and rehabilitation. Therefore, in this study, a cognitive training system was designed and implemented for the purpose of improving cognitive ability and daily life activity in subjects with mild cognitive impairment (MCI) who require cognitive rehabilitation. In the future, an integrated service platform with interactive communication and immediate feedback as an intelligent cognitive rehabilitation integrated platform based on AI and BigData is left as a research project.

Review of Recent Clinical Research for Oral Herbal Medicine Treatment on Primary Hyperhidrosis in Children - Focused on Chinese Randomized Controlled Trials - (소아 일차성 다한증의 경구 한약치료에 대한 중의학 임상연구 동향 - 중국 무작위 대조군 임상연구를 중심으로 -)

  • Choil, Il Shin;Kim, Ki Bong;Cheon, Jin Hong
    • The Journal of Pediatrics of Korean Medicine
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    • v.36 no.3
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    • pp.75-86
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    • 2022
  • Objectives The purpose of the study is to review the trend of clinical trials conducted in China with oral herbal medicine treatment on childhood primary hyperhidrosis. Methods We searched the randomized controlled trials (RCTs) with oral herbal medicine treatment on childhood primary hyperhidrosis from the China National Knowledge Infrastructure (CNKI). The demographic data, duration of illness, intervention, treatment period, outcome and composition of herbal medicine were analyzed for this study. Results A total of five RCTs were selected and analyzed. The effectiveness of the oral administration of herbal medicines on childhood primary hyperhidrosis was found to be significant. In one study, there was no statistical difference between the treatment group and the control group when curative effect was evaluated two weeks after the intervention; however, the treatment group showed a statistically higher curative effect than the control group at one and two months after intervention, and also one month after the intervention was terminated. Conclusions Oral herbal medicine has been shown to be an effective treatment for childhood primary hyperhidrosis, and it takes at least one month for the administered oral herbal medicines to take effect. However, further well-designed large-scale randomized controlled trials are needed to confirm the efficacy and safety of oral herbal medicines in childhood primary hyperhidrosis.

Influence of Police Authorities and Units on Transport Safety in the European Union Countries

  • Chervinchuk, Andrii;Pylypenko, Yevheniia;Veselov, Mykola;Pylypiv, Ruslan;Merdova, Olga
    • International Journal of Computer Science & Network Security
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    • v.22 no.6
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    • pp.109-114
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    • 2022
  • The article is devoted to analyzing the police influence on road safety formation. The globalization processes confirm the study's relevance, provoking population mobility and the need to increase freight traffic. The study aims to identify the factors that affect road safety and the activities of the police and the EU transport safety units. An empirical analysis using factor analysis, correlation analysis, and general scientific methods of cognition were carried out to achieve the goal. The analysis results found that the number of police officers affects road safety, but not in all countries, which confirms the importance of other factors. Based on the analysis results of the scientific literature, the factors affecting transport safety are legislative regulation, the use of innovative technologies, transport infrastructure, geography, and psycho-physical and emotional drivers factors. It has been proved that the police authorities and units cannot fully ensure transport safety in the European Union because the safety is formed by a complex of actions by the state and road users.

Comparative Analysis on the Facilitating Factors Affecting Learning Persistence in Synchronous & Asynchronous Emergency Remote Teaching In University Pandemic Situations (팬데믹 상황 속 대학의 동시적·비동시적 원격수업 촉진요인이 학습지속의향에 미치는 영향 비교분석)

  • Lee, Dae Yeong;Park, Sung Youl
    • Journal of The Korean Association of Information Education
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    • v.26 no.3
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    • pp.175-186
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    • 2022
  • This study has explored the facilitating factors affecting the learning persistence of university students and divided Emergency Remote Teaching(ERT) into two types based on its policies. The conclusions are as follows: First, perceived usefulness was the facilitating factor affecting learning persistence in Synchronous ERT. Therefore, learning persistence would improve by establishing various strategies such as exploring appropriate teaching strategies and building a stable infrastructure. Second, it was perceived usefulness, social presence, and system quality that were the facilitating factors affecting learning persistence in Asynchronous ERT. Thus, learning persistence would increase accompanied by immediate feedback, more active interaction, and so on.

A Study on the Reverse Engineering and Wear Analysis for Remanufacturing Planner Miller (플래너 밀러 재제조를 위한 역설계 및 마모 분석에 관한 연구)

  • Choi, Doo-Han;Kong, Seok-Hwan;Byeon, Jeong-Won;Kim, Tae-Woo;Hong, Dae-Sun
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.6_2
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    • pp.1103-1110
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    • 2022
  • The old machine tools that have been used for a long time cause both increase in defective rate and decrease in productivity compared to new machines due to wear and failure of their components. In order to improve productivity and quality of machined components through remanufacturing, it is necessary to analyze the wear and failure of major components of old machine tools. In this study, the process for reverse engineering is designed for the remanufacture of planner millers, which belong to a very large machine tool. Also, the suitability of the designed process is verified through the analysis of the selected remanufactured components. In the first step of the process, some major components of the aging planner miller are scanned using a 3D laser scanner. In the next step, reverse engineering is performed using the data obtained through 3D scanning. Finally, wear and failure analysis is performed by comparing the reverse engineering data with the scan data. As a result, this reverse design and wear analysis can complement the insufficient design database and reduce costs in the maintenance of remanufactured products.

Reviewing the Applicability of 3D Printing Technology in the Construction Industry (3D 프린팅 기술의 건설 산업 적용가능성 검토)

  • Park, Jinsu;Kim, kyungtaek
    • Korean Journal of Construction Engineering and Management
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    • v.23 no.6
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    • pp.119-124
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    • 2022
  • Recently a method of constructing architectural products using additive manufacturing technology has been proposed. The additive manufacturing technology automates the construction process and it can secure the safety of workers. In addition, due to the high implementation efficiency of atypical shapes, the applicability to the manufacturing process of buildings and infrastructure is drawing attention. Additive manufacturing technology has the ability of satisfying computer-based construction automation, resource management and construction period prediction which is required in the modern construction industry. However, the industrial application is still limited by insufficient data, standards, regulations, and operating methods. In this study, in order to analyze the applicability of architectural additive manufacturing technology, we manufacture each architectural product with two additive manufacturing systems. In addition, we apply an application of each building product into an appropriate manufacturing system through the AM production decision model. And identify problems in the manufacturing process through empirical experiments. As a result, we propose an extended additive production decision model to improve the quality of building products.

Design of AC/DC Combined V2X System for Small Electric Vehicle (소형 전기차 적용을 위한 AC/DC 복합 V2X 시스템 설계)

  • Kim, Yeong-Jung;Chang, Young-Hag;Moon, Chae-Joo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.4
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    • pp.617-624
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    • 2022
  • The small electric vehicles equipped with V2X(vehicle to everything) systems may provide more information and function to the existing navigation system of the vehicle. The key components of V2X technology include V2V (vehicle to vehicle), V2N(vehicle to network) and V2I (vehicle to infrastructure). This study is to design and implementation of VI type E-PTO which is interfaced with external equipments, the work designs the components of E-PTO such as DC/DC converter, DC/AC converter, battery bidirectional charging system etc. Also, it implements the devices and control systems for driving. The test results of VI type E-PTO components showed allowable 10% requirements of transient voltage variation rate and recovery time within 100ms for start/stop and normal operation.

Study on Digitalisation of the Tourism Industry in the Regions of the Russian Federation

  • Ivanova, Raisa;Skrobotova, Olga;Polyakova, Irina;Karaseva, Galina;Strelnikova, Marina
    • International Journal of Computer Science & Network Security
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    • v.22 no.8
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    • pp.385-391
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    • 2022
  • The relevance of the published study lies in the fact that since the introduction of the first Global Distribution System, new information and communication technologies have constantly been changing the tourism industry. In the context of a current digital environment, travel agencies can't avoid participating in digital transformation processes aimed at rethinking operational models, skills, and organisational structures in the regions. This publication aims to present and provide a critical overview of digitalisation processes in tourism development in the regions of the Russian Federation, as well as to reflect on the challenges to the widespread digitalisation processes in the regional tourism sector. The subject of research is digitalisation processes, as they radically transform the modern tourism industry, in the regions as well. The pragmatic research paradigm was considered the most appropriate for the study of tourism digitalisation processes in the regions, as it does not require the selection of a specific theoretical basis for data collection. The pragmatic approach forms an alternative to classical theoretical approaches and serves as a particular type of grounded theory, combining both inductive and deductive methods. No software was used for the inductive part of the analysis. The deductive part was conducted using the qualitative data analysis software Nvivo 11. Given the wide diversity of interested parties in the regional tourism digital area, a stratified purposive sampling method was preferred due to its ability to adequately represent the full picture of the phenomenon under study. The selection and stratum criteria were chosen to maximise the representation of different perspectives in the regional tourism digital area. The novelty of the study is due to the digitalisation processes, with an implication of new needs, while opening up promising opportunities for more productive tourism business in the regions of the Russian Federation. Currently, e-tourism in the Russian Federation has become a subject of lively debate among scholars and practitioners. However, the involvement of advanced digitalisation technologies in the field of information processes in the regions of the Russian Federation is of a very sporadic character.