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Developing a Strategy for Integrating Network Datasets for Supporting Multimodal Transportation
Alexis Richard C. Claridades,Jiyeong Lee 한국측량학회 2023 한국측량학회지 Vol.41 No.6
As urban areas have been undergoing accelerated development, there has also been increasing interest in solving problems in mobility. Experts have identified multimodal transportation as a key concept in addressing this problem by providing transportation options. In providing LBS (Location-based Services), spatial datasets, particularly network data, are essential in representing the navigable spaces for each mode of transportation. However, previous studies on spatial data modeling of multimodal transportation have omitted the spaces that exist between the spaces represented by such network data. Additionally, the integration of these datasets for providing such services is still faced with numerous problems, such as lack of specification, the variety in data formats, potential difficulties in data conversion, or computational burdens due to reliance on geometric properties. This paper proposes a method for integrating network datasets to represent the connectivity of various navigable spaces for supporting multimodal transportation based on topological relationships, described in a spatial data model expressed in UML (Unified Modeling Language). Moreover, using sample data, we demonstrate the models potential for representing seamless travel across transportation modes in a routing experiment. This paper presents a topological relationship-based method to integrate existing network data representing multimodal transportation despite the differences in data format or standard.
FTIR 을 이용한 Cu/SiO2 촉매상에서의 메탄올 분해반응 연구
이동근,Bell,Alexis T 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
Cu/SiO₂촉매에서의 메탄올 분해반응을 연구하기 위하여 FTIR실험을 행하였다. 촉매 표면에 존재하는 메탄올 분해반응 중간물질로는 메탄올, methoxy, formaldehyde, methylenebis(oxy) 및 formate 그룹이 IR 실험결과 나타났으며, 구리의 표면상태가 이들 표면중간물질의 특성에 영향을 주었다. 환원된 촉매의 경우 methoxy가 매우 불안정하고 bidentate formate가 존재한 반면, 부분산화된 촉매의 경우 methoxy의 생성이 두드러졌고 unidentate formate가 존재하였다. 상온에서부터 300℃까지의 승온 FTIR 스펙트럼 결과로부터 Cu/SiO₂촉매상에서의 메탄올 분해반응 메카니즘을 제시하였다. Methanol decomposition on Cu/SiO₂ has been investigated by means of Fourier transform infrared spectroscopy. Infrared spectroscopy experiments showed the following surface methanol decomposition intermediates on Cu/SiO₂: methanol, methoxy, formaldehyde, methylenebis(oxy), and formate groups. The characteristics of surface intermediates were affected by the oxidation state of copper. On reduced copper methoxy was highly unstable and bidentate formate was formed., while on oxidized copper methoxy was stable and unidentate formate was formed. A mechanism of methanol decomposition was also proposed based on temperature programmed infrared experiment from 20 to 300℃.
IndoorGML-based Topological Data Generation from Omnidirectional Images
Claridades, Alexis Richard(알랙시스 리차드 클라리다데스),Lee, Jiyeong(이지영),Blanco, Ariel(아리옐블랑코) 한국측량학회 2019 한국측량학회 학술대회자료집 Vol.2019 No.4
As applications for spatial information move towards navigation indoors, the need to generate 3D data for this purpose have been gaining attention. However, most available methodologies for generating 3D spatial data require expensive sensors, or complex methodologies involving computationally-heavy data. This study aims to present a methodology to generate a 3D Topological Model based on IndoorGML (Indoor Geographic Markup Language) from omnidirectional images taken along a building’s interior. Using a camera, fisheye lens and a rotator setup, images were taken along Shooting Points in the corridors with relative positions obtained from the floor plan. From the images, doors that indicate presence of indoor spaces were identified from the images, and 3D node-relation graphs representing adjacency, connectivity and accessibility were generated.
Park, Sangwoo,Lee, Dongseop,Lee, Seokjae,Chauchois, Alexis,Choi, Hangseok Elsevier 2017 ENERGY Vol.118 No.-
<P><B>Abstract</B></P> <P>An energy pile equipped with a W-type heat exchange pipe was constructed in reclaimed soft ground, which is fabricated in a large-diameter cast-in-place pile. The diameter of the energy pile is 1.5 m and the drilled depth reaches to a 60 m whilst the heat exchange pipe is inserted to 30 m depth from the ground surface. To evaluate thermal performance of the constructed energy pile, a series of in-situ thermal performance tests was carried out by controlling intermittent cooling and heating loads, in which the inlet and outlet fluid temperatures, flow rate, and temperatures inside the energy pile were recorded. The test results show that a large-diameter cast-in-place energy pile can provide sufficient heat exchange compared with other types of ground heat exchangers. A series of CFD analyses was performed to simulate the thermal performance tests and provide the designer with preliminary estimation of thermal performance of energy piles. The numerical model was verified by comparing with the field measurements. Using the developed numerical model, the thermal behavior of the energy piles was evaluated with various parameters, and effects of the thermal interference and the temperature difference between the fluid and ground formation on the thermal performance were discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A large-diameter cast-in-place energy pile was constructed in reclaimed soft ground. </LI> <LI> Thermal performance tests were performed to estimate thermal performance of the energy pile. </LI> <LI> The heat exchange in cooling operation was about two times as large as that in heating operation. </LI> <LI> A parametric study was conducted to estimate the effect of temperature difference between fluid and ground formation. </LI> <LI> Tighter pipe layout causes thermal interference that reduces thermal performance of energy piles. </LI> </UL> </P>
Engineering of Guangzhou International Finance Centre
Kwok, Michael,Lee, Alexis Council on Tall Building and Urban Habitat Korea 2017 International journal of high-rise buildings Vol.6 No.1
The Guangzhou International Finance Centre (IFC) is a landmark building that symbolizes the emerging international strength of Guangzhou, China's third largest city. It is also one of the dual iconic towers along the main axis of Guangzhou Zhujiang New Town. Arup adopted a total engineering approach in embracing sustainability and aiming at high efficiency solutions based on performance-based design principles covering structures, building services, fire engineering, vertical transportation, and façade performance to constitute an efficient and cost-effective overall building design. Through dynamic integration of architectural and engineering principles, Guangzhou IFC represents a pioneering supertall building in China. It adopts a diagrid exoskeleton structural form that is clearly expressed through the building's façade and gives the building its distinctive character. The aerodynamic shape of the building not only presents the aesthetic quality of elegant simplicity, but also reduces the effects of wind, thereby reducing the size and weight of the structure. State-of-the-art advanced engineering methods, such as optimization techniques and nonlinear finite element modelling, were applied in parallel with large-scale experimental programs to achieve an efficient and high-performance design taking into account the constructability and cost-effectiveness for a project of this scale.