• Journal of the Computational Structural Engineering Institute of Korea
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• v.27 no.4
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• pp.265-271
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• 2014

304L stainless steel sheets are used as a primary barrier for the insulation of membrane-type liquefied natural gas(LNG) carrier cargo containment system. 304L stainless steel is a transformation-induced-plasticity(TRIP) steel that exhibits complex material behavior, because it undergoes phase transformation during plastic deformation. Since the TRIP behavior is very important mechanical characteristics in a low-temperature environment, significant amounts of data are available in the literature. In the present study, a uniaxial tensile test for 304L stainless steel was performed to investigate nonlinear mechanical characteristics. In addition, a viscoplastic model and damage model is proposed to predict material fractures under arbitrary loads. The verification was conducted not only by a material-based comparative study involving experimental investigations, but also by a structural application to the LNG membrane of a Mark-III-type cargo containment system.

• Journal of the Korean Electrochemical Society
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• v.19 no.2
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• pp.45-49
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• 2016

In order to mitigate oxidative degradation of polymer membrane during fuel cell operation, an organic radical quencher was introduced. Rutin was selected as a radical quencher and mixed with sulfonated poly(arylene ether sulfone) to prepare composite membrane. Physicochemical properties of the composite membranes such as water uptake and proton conductivity were characterized. Hydrogen peroxide exposure experiment, which can mimic accelerated oxidative stability test during fuel cell operation, was adopted to evaluate the oxidative stability of the membranes. The composite membranes containing Rutin showed similar proton conductivity and enhanced oxidative stability compared to pristine ones.

• Journal of the Economic Geographical Society of Korea
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• v.22 no.3
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• pp.274-290
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• 2019

This article links the change in regional manufacturing employment in Korea after the financial crisis to the geography of technological and trade shocks. We conceptualize the trade shock as the rapid growth in Korean imports from and exports to China and ASEAN countries. We then measure the exposure to technological shocks as the degree to which regions are specialized in routine tasks, which are susceptible to automation technologies. Results show that local labor markets specialized in routine tasks experience significant falls in manufacturing employment. Regions whose industrial structure exposes them to rising import competition experience sharp drop in manufacturing employment. We also found that export plays a major role in explaining the growth of regional manufacturing employment.

• Journal of IKEEE
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• v.23 no.3
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• pp.1068-1076
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• 2019

Most of the electronics we use today have built-in microcontrollers, which are called embedded systems. In such a small environment, responsiveness is very important for the microcontroller. In this paper, the basic input/output control, timer/counter interrupt operation principle, and understanding of the microcontroller are described. Program logic is proposed to improve throughput and latency by controlling characteristics of service routine and program execution order. The hardware simulations in this paper were verified using ATmega128 and PIC16F877A from Atmel and Microchip.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.341-342
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• 2021

본 논문에서는 운동 관련 빅데이터를 적용한 인공지능을 활용하여 개개인에게 알맞은 운동 루틴을 추천해 주는 비대면 방식 PT를 제안한다. 이 정책은 '건강한 사람이 앱을 만나 더 건강해진다.'는 모토를 중심으로, 홈 트레이닝을 하고 싶지만 운동방법을 모르는 사람들로 하여금 자신에게 맞추어진 루틴 구성을 통해 운동 수행능력의 효율성을 높이고, 잘못된 자세로 인한 부상 등을 최소화한다. 또한 이 정책은 기존의 일일이 사용자가 입력해야 했던 시스템들에서 머신러닝을 통한 AI 알고리즘을 통한 추천을 통해 비대면 방식의 수동적인 운동 방식에서 AI가 트레이너 역할을 해주는 방식으로 사용자와 상호작용하고, 정확한 운동 목표를 추천함으로써 운동 지속성과 동기성을 부여한다. 본 논문에서는 프로토타입을 통해 제안하는 AI를 적용한 맞춤 헬스 정책이 기존의 헬스 앱 업계에서 시장성을 보일 수 있다는 가능성에 의의를 둔다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.366-367
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• 2023

지적 장애인은 제한된 활동 환경 범위의 제약으로 인해 자기 신체 구조에 맞는 운동법을 접할 기회가 적고, 각자의 건강 상태와 신체 구조에 따라 운동할 때 세심한 요구가 필요하다. 본 논문은 지적 장애인을 대상으로 비만 관리에 대한 필요성 인지 및 신체 활동량을 늘리기 위한 개인 맞춤형 운동 루틴 추천 시스템을 제안하였다. 제안한 시스템을 구성하기 위해 먼저 대한장애인체육회에서 제공하는 건강 상태, 신체 정보, 장애 유형 및 등급 등의 데이터를 분석하였다. 또한, 웹 사이트에서 장애인의 입력 정보가 들어오면 TF-IDF 벡터를 산출하고, 다른 사용자와의 코사인 유사성을 분석해 운동 루틴을 제안하였다. 본 연구에서 제안한 추천 시스템을 통해 지적 장애인을 대상으로 맞춤형 건강관리에 대한 인식 향상 및 건강권 보장, 운동 효율 증진 등을 기대할 수 있다.

• School Mathematics
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• v.16 no.3
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• pp.585-611
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• 2014

The purpose of this study is to understand the decision-making behavior of a mathematics teacher in science academy of Korea by applying the framework of class analysis through the theory of goal-oriented decision-making. To this end, we selected as the participant a mathematics teacher in charge of the class of basic calculus of science high school for the gifted in the metropolitan area, and observed the teacher's lesson. Based on a questionnaire derived from previous studies, we analyzed goals, orientations and resources of the teacher. Research results show that there are certain teaching routines by analyzing the behavior patterns that appear repeatedly in the teacher's lesson. Also we understand that it can be used on goals, orientations and resources of the teacher to adequately explain his teaching routine. In the present study, in particular, it was found to have a similar but partially different routines to the teaching routines shown in the study of Schoenfeld. From these findings, We can derive the implications that the theory of goal-oriented decision making can be suitably used as analytical tool for understanding the behavior of the teacher who pursue a productive interaction in mathematics lesson in Korea.

• Korean Journal of Food Science and Technology
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• v.49 no.3
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• pp.258-264
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• 2017

The stability and accuracy of ultra-performance liquid chromatography (UPLC) used for evaluating the contents of rutin and quercetin in tartary buckwheat (Fagopyrum tataricum Gaertn.) seeds extracted by seven different extraction methods were determined. The seven extraction methods were reflux extraction (RE), ultra-sonification extraction (UE), stirrer extraction (SE), RE after UE (UE+RE), RE after SE (SE+RE), UE after SE (SE+UE), and RE with UE after SE (SE+UE+RE). Among the seven extraction methods used, RE yielded comparatively higher contents of rutin (2,277 mg/ 100 g) and quercetin (158 mg/100 g) than those yielded by other six extraction methods. The intra-day repeatability and inter-day precision of RE was 0.4-3.2% considering relative standard deviation (RSD), while accuracy was 88.8-102.4%. Therefore, RE with UPLC would be a rapid, accurate, and stable method for analyzing rutin and quercetin contents in tartary buckwheat.

• Journal of the korean Society of Automotive Engineers
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• v.22 no.2
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• pp.80-81
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• 2000

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.129-129
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• 2015

Dry etcher, PECVD등의 플라즈마 공정 장비의 구조물에는 유전체로 절연된 금속판들이 사용된다. 플라즈마 이론을 보면 이들 표면의 전위는 양전하 플럭스와 음전하 플럭스가 같아서 순전류가 0이 되는 부유 전위를 갖는다. 금속과 같은 전도체의 표면은 모두 같은 전위를 가져야 한다. 일반적인 플라즈마 시뮬레이션 소프트웨어에는 이런 경계 조건이 선택 가능하지 않다. ESI사의 CFD-ACE+의 사용자 루틴 개발 기능을 이용하여 Fortran90문법으로 경계면 최인접 셀의 중심에서 구한 전자 온도와 경계면의 이온 입사 플럭스로 가중평균을 구한 이온 질량을 맥스웰분포를 가정한 부유 전위식에 대입하여 시뮬레이션을 CCP에서 구현하였다. 원형 챔버의 가장자리에 떠 있는 사각 링 전극을 가정하고 이 전극 표면이 접지 전위일때, 유전체 일때, 본 연구에서 개발한 루틴을 적용한 결과를 Ar CCP에 대해서 비교 분석하였다.