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지역의 재난 취약성 평가방법의 제안과 호우 재난에 적용
박재혁(Park, Chanyoung),박찬영(Park, Chanyoung),안재현(An, Jaehyun),윤홍식(Yoon, Hongsic) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.1
재난관리에 있어 지역이 재난으로부터 얼마나 위험하고 취약한지에 대한 분석 및 평가는 필수적이다. 정부에서 제공하는지역 안전지수, 지역 안전도 등은 재난 관련 지역의 안전 수준에 대한 정보는 제공하나, 재난관리에 활용하기에는 부족한부분이 있다. 본 연구에서는 취약성 함수의 개념을 활용하여 재해연보, 기상자료, 통계자료를 GIS 프로그램으로 분석하는취약성 평가방법을 제안하고, 해당 방법으로 호우로 인한 재난에 대한 지역의 취약성을 평가하였다. 취약성 평가를 통해산출한 시ㆍ군ㆍ구 취약성 수치로 호우에 취약한 지역을 확인하였고, 지역별 취약성의 시계열적 변화를 분석하였다. 취약성평가의 결과는 국민에게 재난 관련 구체적인 정보를 제공하고, 재난관리자에게는 재난관리 계획 수립 및 시행에 필요한실증적 근거로 활용될 수 있다. In disaster management, it is essential to evaluate how dangerous the disasters are and how vulnerable our communities are to them. The Region Safety Index and the Region Safety Levels provide information about the level of safety in a local area against disasters, but this information is not enough for use in disaster management. This study proposes a vulnerability assessment method that utilizes the concept of a vulnerability function to analyze disaster records, weather data, and statistical data using a GIS program. We identified regions vulnerable to heavy rain using vulnerability figures and analyzed time-series changes in region vulnerability. This vulnerability assessment provides specific information on disasters and can be used by disaster managers as empirical information for planning and implementing disaster management plans.
Chanyoung Ju(주찬영),Sungjun Park(박성준),Sangsoo Park(박상수),Hyoung Il Son(손형일) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.11
This study evaluates the usefulness of haptic guidance and investigates the effect of inaccuracy in haptic guidance on the task performance. Both position inaccuracy and orientation inaccuracy were considered. The peg-in-hole task was conducted as a benchmark test for evaluation, and a psychophysical study was performed and analyzed on eight inaccuracy combinations. In conclusion, the haptic guidance showed outstanding performance in terms of task completion time, position tracking performance, contact force, and total force, but the haptic guidance with severe orientation inaccuracy caused serious complications.
An encoder–decoder switch network for purchase prediction
Park, Chanyoung,Kim, Donghyun,Yu, Hwanjo Elsevier 2019 Knowledge-based systems Vol.185 No.-
<P><B>Abstract</B></P> <P>Users in e-commerce tend to click on items of their interest. Eventually, the more frequently an item is clicked by a user, the more likely the item will be purchased by the user after all. However, what if a user <I>clicked on every item only once before purchases</I>? This is a frequently observed user behavior in reality, but predicting which of the clicked items will be purchased is a challenging task. This paper addresses a practical yet widely overlooked task of predicting purchase items within a <I>non-duplicate click session</I>, i.e., a session in which every item is clicked only once. We propose an encoder–decoder neural architecture to simultaneously model users’ click and purchase behaviors. The encoder captures a user’s intent contained in the user’s click session, and the decoder, which is equipped with pointer network via a switch gate, extracts relevant clicked items for future purchase candidates. To the best of our knowledge, our work is the first to address the task of purchase prediction given non-duplicate click sessions. Experiments demonstrate that our proposed method outperforms the state-of-the-art purchase prediction methods by up to 18% in terms of recall.</P>
Park, Chanyoung,Choi, Seona,Chae, Jungmin,Kim, Seongwon,Kim, Hyungtae,Oh, Yoon-Suk The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.1
The effect of substrate rotation speed on the phase forming behavior and microstructural variation of 8 wt% yttria ($Y_2O_3$) stabilized $ZrO_2$ (8YSZ) coatings as a thermal barrier coating has been investigated. 8YSZ coatings with $100{\sim}200{\mu}m$ thickness were deposited by electron beam-physical vapor deposition onto a super alloy (Ni-Cr-Co-Al) substrate with a bond coating (NiCo-CrAlY). The width of the columnar grains of the 8YSZ coatings increased with increasing substrate rotation speed from 1 to 30 rpm at a substrate temperature range of $900{\sim}950^{\circ}C$. In spite of the different growth behaviors of coatings with different substrate rotation speeds, the phases of each coating were not changed remarkably. Even after post heat treatments with various conditions of the coated specimens fabricated at 20 rpm, only a change of color was noticeable, without any remarkable change in the phase or microstructure.
Chanyoung Park,Tae Hyeon Park,Tae-Jip Kim 한국당과학회 2021 한국당과학회 학술대회 Vol.2021 No.01
From the genome of Streptococcus equinus, the putative gene encoding an intracellular α -L-arabinofuranosidase (EC 3.2.1.55, SteqAF43C) has been found, cloned, and constitutively expressed in Escherichia coli. Its open reading frame consists of 1,002 nucleotides encoding 334 amino acids (~38.4 kDa). SteqAF43C with C-terminal six histidines showed the highest activity on debranched arabinan at 30℃ and pH 5.0 in 50 mM sodium acetate buffer. SteqAF43C could exclusively produce L-arabinose from the linear arabinan and linear arabinooligo- saccharides, not from the branched arabinosyl and arabinoxylosyl substrates. These modes of action proposed that SteqAF43C specifically catalyzes the hydrolysis of the α-(1,5)-L-arabinofuranosyl linkages of arabinan backbone, not α-(1,2)/(1,3)-linkages of arabinan branches. Accordingly, SteqAF43C is an arabinan-specific α -(1,5)-L-arabinofuranosidase belonging to GH43.