• 한국컴퓨터정보학회논문지
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• 제27권8호
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• pp.151-160
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• 2022

본 연구에서는 급증하는 배송 서비스 수요에 맞춰 더 신속하고 최저 비용으로 근거리 배송을 가능하게 하는 알고리즘을 제안하고자 한다. 본 연구에서 제안하는 알고리즘에서는 배송원으로 지하철 승객을 물류 이동에 참여시킨다. 이때 승객은 이동 경로와 일치하는 배송 물류를 선택할 수 있다. 그리고 서비스 이용자의 입장에서는 현재 근처에 경로가 일치하는 배송원을 선택할 수 있다. 이때 배송원 추천은 TF-IDF&N-gram과 BERT를 결합한 텍스트 유사도 측정 방식으로 진행된다. 따라서 기존 택배 시스템과 달리 소비자-배송원 간의 man-to-man 방식으로 양방향 선택을 지원한다. 탑승 중인 승객을 물류 이동에 참여시킨다는 점에서 비용 최소화와 배송 기간 단축을 모두 보장할 수 있다. 더하여 운송 측면에서도 특별한 기술을 요하지 않으므로, 일자리 입지가 축소된 노동자들에게 경제 참여 기회를 제공할 수 있다는 점에서도 의의가 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.581-584
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• 2007

The subway concrete box structure can`t establish expansion joint because of animal power delivery of the subway rail. In this case, As increase of structure volume, it is subjected to cause temperature crack. The temperature crack due to the heat of hydration classified a nonstructural crack. but it has a bad effect on durability of concrete structures. especially, in case of a subway concrete box structure, when a water-proof facilities is beaked on an outer-wall, the water leakage occurs through a penetration crack generated from a wall of the concrete structure too. This paper, for the subway concrete box structure, examined a condition of temperature crack occurrence by a heat of hydration concerned external temperature from analysing by a three dimensional finite element method.

• 한국콘텐츠학회논문지
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• 제21권12호
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• pp.375-383
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• 2021

COVID-19로 인해 사람들은 외출과 모임 자제로 온라인 쇼핑, 온라인 여행, 화상회의 등 새로운 라이프 스타일을 구축하고 있다. 이러한 급격한 사회의 변화는 새로운 문제들을 야기시킴과 동시에 기존의 문제들을 심화시키고 있다. 특히 온라인 소비가 크게 증가함에 따라 생활물류산업에서는 교통체증, 대기오염, 배송기사의 과중한 업무 등이 심화되고 있으며 대면배송이 새로운 문제점으로 나타나고 있다. 4차 산업혁명의 등장으로 드론에 인공지능, 자율주행 등을 활용한 무인 배달이 기존 생활물류산업의 대체산업으로 떠오르고 있으나 드론의 비행에 따른 물류시설의 공간과 추가적인 물류부지 확보가 해결되어야 하는 새로운 문제점으로 나타난다. 따라서, 기존의 문제들과 새롭게 생겨난 문제들을 해소할 수 있는 드론을 위한 물류시설의 공간으로 기존 운수 사업인 지하철을 활용하여 물류 이동과 보관, 배송 등과 같은 부가적인 서비스를 연계하고자 한다.

• 한국입자에어로졸학회지
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• 제18권1호
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• pp.1-8
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• 2022

Since 2019, the corona virus has been continuously affect human life. In particular, in the indoor space where people live, infection by airborne transmission of viruses is a problem. Among them, the spread in the subway, which is the main mode of transport for humans, can be serious. To solve this problem, our research team developed an ionic wind collector to collect and remove corona virus using an ionic wind collector and ozone. In order to apply the ionic wind collector to the subway, it must operate in two modes. Because large amounts of ozone are harmful to the human body. There is a mode that collects bio-aerosol from the air using ionic wind and a mode that inactivates viruses floating in the air by generating a large amount of ozone. As the applied voltage increased, the cleaning ability of the ionic wind collector increased, and the farther the distance between the discharge electrode and the ground plate, the higher the cleaning ability even at low current. In addition, clean air delivery rate (CADR) of an ionic wind collector was up to 5.5 m³/min. As a result of measuring the amount of ozone generated, it was confirmed that 50 ppb to 250 ppb was generated, and it was confirmed that ozone generation was controllable in the ionic wind dust collector.

• 한국입자에어로졸학회지
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• 제18권3호
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• pp.51-59
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• 2022

In this work, virion concentration and its dose changes by HVAC and air cleaners were estimated in a subway station platform to control airborne infection of SARS-CoV-2. Collection efficiencies with particle size were measured for the air filter equipped in a HVAC in one subway station in Daejeon. Indoor PM_2.5 changes according to outdoor PM_2.5 with time were also measured to estimate air infiltration rate in the subway station platform. When infected persons generate virions by 10⁴, 10⁵, 10⁶, 3 × 10⁶ and 5 × 10⁶ h^-1 in a 2,400 m³ volume platform, the concentration and dose were estimated as 9, 92, 275 and 458 virions/m³ and 4, 43, 130 and 217 virions after 1 hour exposure, respectively. The concentration and dose were reduced by 70%, and 64%, respectively by operations of both HVAC (with a flow rate of 16,000 m³/h, MERV 11) and ten air cleaners(with total CADR 10,740 m³/h) compared to those without operation of both HVAC and air cleaners. However, virion dose in the platform was estimated to be too low at the general conditions due to a large space, a high air infiltration (3 h^-1) and a short residence time (usually < 10 mins) in the platform irrespective of the operations of HVAC or air cleaners. HVAC with filters and air cleaners would be more necessary in the concourse or shopping areas in the subway stations to reduce the infection dose from a few hundred to several tens virions in a hour.

• 한국인터넷방송통신학회논문지
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• 제23권5호
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• pp.177-182
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• 2023

모임 장소를 정할 때에 모든 참여자의 이동 시간이 작으면서 적당한 매장을 정하는 것은 항상 번거로운 문제이다. 본 논문에서는 이를 해결하기 위해서 지하철역 기반으로 최적의 장소와 매장을 추천하는 알고리즘을 제안하고 시스템을 개발한다. 본 시스템은 자영업자들이 자신의 매장 정보를 등록하여 홍보토록 하는 매장 정보 등록 기능을 웹 기반으로 제공하고, 모임 참여자들에게 모임 장소를 추천하는 기능을 앱 기반으로 제공한다. 제안한 알고리즘은 지하철 노선도를 기반으로 모든 참여자의 이동 시간을 줄이고 소요 시간의 표준편차를 이용하여 공평성을 향상시켰다. 또한, 본 시스템은 최근 배달앱을 통한 홍보에만 의존한 자영업자들의 홍보수단에 새로운 방안을 제시한다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2007년도 학술대회
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• pp.185-190
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• 2007

This article describes a development CDMA LBS in order to apply to "Control System of Underground Infrastructure Fire Accident" which one of U-City Projects of Seoul City. Our goal guides taking shelter of the sufferer it will not be able to use a GPS when the fire occurs from subway station. There are Location measurement methods which measures the AOA(Angle of Arrival) of the signal which it sends with the MS(Mobile station) from the BS(Base station), an electronic delivery time (TOA:Time of Arrival) and the relative difference of electronic arrival time from Base stations (TDOA:Time Difference of Arrival). This time the error due to a multiplex course error and near-far problem and NLOS(Non Line of Sight). We are planning to construct the Test Bed which is an error below 1 meter.

• International Journal of Internet, Broadcasting and Communication
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• 제15권1호
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• pp.97-112
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• 2023

The purpose of this study is to design and test a new way of public transportation route guidance system for persons with disabilities, including wheelchair users. The guidance system is smartphone app-based, using, routes that involve disabled-friendly facilities in the vicinity can be searched. A database that contains publicly available data on low-floor bus services, location and extent of disabled-friendly facilities, and suitable subways and stations, was developed for this purpose. The app uses the database to access and query the required information. A pilot study was conducted to test the effectiveness of the guidance system. It was found that the system was able to convey information about the disabled-friendly routes and related guidance information even inside subway stations, effectively. The performance of the system was compared with route guidance services that do not explicitly use data on disabled-friendly services. A notable difference was observed in the travel time estimated by this program and other guidance services. The difference was around 4 to 15 minutes. This is significant savings for persons with disabilities if they use the app and service. The study thus shows that exclusive use of disabled-friendly data in route guidance will bring more benefits for persons with disabilities.