심리적 안정감을 위한 복합상업시설 오픈스페이스 계획에 관한 연구

최민석 ( Choi¸ Minseok ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.6

(연구배경 및 목적) 복합상업시설 오픈스페이스가 가진 열린 공간적 특성으로 인해 이용자가 낯선 타인과의 접촉과 시선에 노출되어 체류하는 동안 심리적 불안감을 발생시킬 수 있다. 복합상업시설을 위한 디자인 계획은 공간의 시각적 개선방안과 더불어 타인과의 관계 속에 편안하고 안정적인 공간감을 느낄 수 있는 공간구성과 배치가 이루어지도록 하여 이용자들이 자신의 목적에 맞게 여유로운 공간 영위가 가능할 수 있는 계획방안이 요구된다. 본 연구는 진화론적 인간반응 이론을 기반으로 복합상업시설 오픈스페이스의 물리적 환경에 투영하여 안정적 공간감을 형성할 수 있는 공간구성과 배치에 대한 계획방안을 제시하는 것을 목적으로 한다. (연구방법) 본연구는 진화론적 인간 반응에 대한 이론에서 나타내는 안정감을 형성하는 공간구조를 투영하여 복합상업시설 오픈스페이스에서 안정감을 형성시키는 공간구성과 배치에 대한 계획요인 인 ‘시선유도대상의 구성’, ‘시선관계의 조정’, ‘프라이버시 확보구조’를 도출하였다. 사례분석을 통해 이용자들이 안정감있는 있는 복합상업시설 오픈스페이스 이용환경을 구성하기 위한 계획요소들을 제시하고 종합분석을 통해 진화론적 인간반응을 이해한 계획의 중요성을 시사하고, 계획방안을 제시한다 (결과) 제시한 계획요인은 복합상업시설 오픈스페이스의 공간구성 및 배치계획에 있어 안정감 형성에 영향을 주며, 이들 계획요인은 상호연계되고 보완작용을 하므로 한 측면만이 아닌 복합적으로 고려하여 계획해야 함을 알 수 있다. (결론) 진화론적 인간반응 이론을 기반 한 계획은 인간의 근본적인 습성을 위한 계획이며 이용자에게 안정감을 형성시켜 공간이용의 만족감을 줄 수 있는 방법이다. 따라서 복합상업시설 오픈스페이스의 구성과 배치는 이용자들이 안정감있는 공간영위가 가능한 환 환경이 되도록 인간의 습성을 고려하여 계획되어야 한다. 본 연구를 통해 복합상업시설 오픈스페이스를 디자인하는데 있어 진화론적 인간반응을 감안한 계획의 중요성을 시사하고, 시각적 표현과 함께 인간의 근본적 특성에 대응한 공간구성 및 배치가 안정적인 공감감을 형성하는데 주요한 요인임을 알 수 있었다. 본 연구가 복합상업시설 오픈스페이스 계획 연구에 새로운 연구지표가 되고, 인간 중심 디자인 연구에 초석이 되기를 기대해 본다. (Background and Purpose) The open spatial characteristics of the open space in commercial multi-complex can cause psychological anxiety during the stay by exposing users to contact and gaze with strangers. The design an for the open space in commercial multi-complex requires planning measures to ensure that users can enjoy a comfortable and stable space for their own purposes by improving the visual quality of the space and allowing them to feel comfortable and stable space in their relationships with others. Based on the theory of evolutionary human response, this study aims to present planning measures for spatial composition and layout that will make the open space in commercial multi-complex that can form a stable sense of space. (Method) The spatial structure that forms the sense of stability expressed in the theory of evolutionary human reactions is projected into the open space in commercial multi-complex, The planning factors for spatial composition and arrangement that form a sense of stability were derived: 'Configurement of attention-inducing objects', 'adjustment of eye-attention relationships' and 'structure of privacy'. Through case analysis, the users present planning elements to form a stable open space environment for complex commercial facilities, suggest the importance of the plan to understand the evolutionary human response through a comprehensive analysis, and present the planning plan. (Results) The proposed planning factors affect the formation of a sense of stability in the space composition and layout of the open space in commercial multi-complex, and since these planning factors are interconnected and have complementary actions, it can be seen that the planning factors should be considered not only in one aspect but in a complex way. (Conclusions) A plan based on evolutionary theory of human response is a plan for the fundamental habits of human beings and is a way to create a sense of stability for users to give satisfaction in space use. Therefore, the composition and layout of the open space in commercial multi-complex should be planned in consideration of human habits so that users can have a stable space environment. Through this study, we suggest the importance of planning considering evolutionary human reactions in designing the open space in commercial multi-complex and it was found that spatial composition and arrangement in response to fundamental human characteristics, along with visual expression, are the main factors in creating stable empathy. We hope that this study will serve as a new research indicator for the study of planning for open space in commercial multi-complex and as a cornerstone for the study of human-centered design.

Recent Advances in Physics-Informed Machine Learning

Minseok Choi(최민석) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.5

SlowFast Networks for Video Forest Fire Smoke Detection

Minseok Choi(최민석),Dohaeng Kim(김도행),Kukhee Lee(이국희),Hyunseok Oh(오현석) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

Adaptive Detector Selection for Queue-Stable Word Error Rate Minimization in Connected Vehicle Receiver Design

Choi, Minseok,Kim, Joongheon,Moon, Jaekyun IEEE 2018 IEEE Transactions on Vehicular Technology VT Vol.67 No.4

<P>High-speed and low-latency communications are one of the major requirements for connected vehicle environments. Safety messages in vehicular networks must arrive on time for each vehicle, and the optimization of driving paths also strongly depends on low-latency traffic information. To comply with the demands, a base station take important roles to provide a short service delay for the vehicles, even at the expense of performance. The relationship between delay time and decoding performance at receiver sides in physical layers can be explained by the performance/complexity tradeoff as follows. To achieve better performance in terms of the minimization of word error rates in decoding, the receiver usually requires higher complexity, which results in larger delays. We analyze this tradeoff based on the receiver queue model. This paper proposes a novel algorithm to adaptively select one of receiver candidates under the constraint of queue stability so as not to degrade low-latency communications. Based on the configurable architecture for multi-input multioutput (MIMO) detectors, this paper shows that the proposed algorithm works well on adaptive MIMO detector selection.</P>

Effects of Metal-Doping on Hydrogen Evolution Reaction Catalyzed by MAu₂₄ and M₂Au₃₆ Nanoclusters (M = Pt, Pd)

Choi, Woojun,Hu, Guoxiang,Kwak, Kyuju,Kim, Minseok,Jiang, De-en,Choi, Jai-Pil,Lee, Dongil American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.51

<P>This paper describes the effects of doped metals on hydrogen evolution reaction (HER) electrocatalyzed by atomically controlled MAu<SUB>24</SUB> and M<SUB>2</SUB>Au<SUB>36</SUB> nanoclusters, where M = Pt and Pd. HER performances, such as onset potential (<I>E</I><SUB>onset</SUB>), catalytic current density, and turnover frequency (TOF), are comparatively examined with respect to the doped metals. Doping Pt or Pd into gold nanoclusters not only changes the electrochemical redox potentials of nanoclusters but also considerably improves the HER activities. <I>E</I><SUB>onset</SUB> is found to be controlled by the nanocluster’s reduction potential matching the reduction potential of H<SUP>+</SUP>. The higher catalytic current and TOF are observed with the doped nanoclusters in the order of PtAu<SUB>24</SUB> > PdAu<SUB>24</SUB> > Au<SUB>25</SUB>. The same trend is observed with the Au<SUB>38</SUB> group (Pt<SUB>2</SUB>Au<SUB>36</SUB> > Pd<SUB>2</SUB>Au<SUB>36</SUB>> Au<SUB>38</SUB>). Density functional theory calculations have revealed that the hydrogen adsorption free energy (Δ<I>G</I><SUB>H</SUB>) is significantly lowered by metal-doping in the order of Au<SUB>25</SUB> > PdAu<SUB>24</SUB> > PtAu<SUB>24</SUB> and Au<SUB>38</SUB> > Pd<SUB>2</SUB>Au<SUB>36</SUB> > Pt<SUB>2</SUB>Au<SUB>36</SUB>, indicating that hydrogen adsorption on the active site of nanocluster is thermodynamically favored by Pd-doping and further by Pt-doping. The doped metals, albeit buried in the core of the nanoclusters, have profound impact on their HER activities by altering their reduction potentials and hydrogen adsorption free energies.</P> [FIG OMISSION]</BR>

Bi-Directional Cooperative NOMA Without Full CSIT

Choi, Minseok,Han, Dong-Jun,Moon, Jaekyun IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.11

<P>In this paper, we propose bi-directional cooperative non-orthogonal multiple access (NOMA). Compared to conventional NOMA, the main contributions of bi-directional cooperative NOMA can be explained in two directions: 1) the proposed NOMA system is still efficient when the channel gains of scheduled users are almost the same and 2) the proposed NOMA system operates well without accurate channel-state information at the base station. In a two-user scenario, the closed-form ergodic capacity of bi-directional cooperative NOMA is derived, and it is proven to be better than those of other techniques. Based on the ergodic capacity, the algorithms to find optimal power allocations maximizing the user fairness and sum rate are presented. Outage probability is also derived, and we show that bi-directional cooperative NOMA achieves a power gain over uni-directional cooperative NOMA and a diversity gain over non-cooperative NOMA and orthogonal multiple access (OMA). We finally extend the bi-directional cooperative NOMA to a multiuser model. The analysis of ergodic capacity and outage probability in a two-user scenario is numerically verified. Also, simulation results show that bi-directional cooperative NOMA provides better data rates than the existing NOMA schemes as well as OMA in a multiuser scenario.</P>

Wireless Video Caching and Dynamic Streaming Under Differentiated Quality Requirements

Choi, Minseok,Kim, Joongheon,Moon, Jaekyun IEEE 2018 IEEE journal on selected areas in communications Vol.36 No.6

<P>This paper considers one-hop device-to-device-assisted wireless caching networks that cache video files of varying quality levels, with the assumption that the base station can control the video quality but cache-enabled devices cannot. Two problems arise in such a caching network: <I>file placement problem</I> and <I>node association problem</I>. This paper suggests a method to cache videos of different qualities, and thus of varying file sizes, by maximizing the sum of video quality measures that users can enjoy. There exists an interesting tradeoff between video quality and video diversity, i.e., the ability to provision diverse video files. By caching high-quality files, the cache-enabled devices can provide high-quality video, but cannot cache a variety of files. Conversely, when the device caches various files, it cannot provide a good quality for file-requesting users. In addition, when multiple devices cache the same file but their qualities are different, advanced node association is required for file delivery. This paper proposes a node association algorithm that maximizes time-averaged video quality for multiple users under a playback delay constraint. In this algorithm, we also consider <I>request collision</I>, the situation where several users request files from the same device at the same time, and we propose two ways to cope with the collision: scheduling of one user and non-orthogonal multiple access. Simulation results verify that the proposed caching method and the node association algorithm work reliably.</P>

Solving Stochastic Partial Differential Equations With Machine Learning

Minseok Choi(최민석) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.08

Hydrogen Passivation of Impurities in Al₂O₃

Choi, Minseok,Janotti, Anderson,Van de Walle, Chris G. American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.6

<P>Carbon and nitrogen are contaminant impurities in Al2O3 dielectrics grown by atomic layer deposition, leading to deleterious effects in device performance. We investigate whether these impurities can be passivated using hydrogen. The role of atomic hydrogen in the electronic properties is addressed by examining formation energies and charge-state transition levels of C-H and N-H complexes. Combined with calculated band alignment, we then assess the impact on Al2O3/semiconductor interfaces. We find that hydrogen is indeed an effective passivating agent: it removes carbon-related carrier traps and passivates negative fixed charge associated with nitrogen.</P>

CJ BLOSSOM PARK

Minseok Choi,Dalsung Lee 한국강구조학회 2017 Steel Construction Vol.- No.11