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VOCs 방출챔버를 이용한 자동차 내장재의 휘발성유기화합물 방출특성에 관한 연구
홍승표(Seungpyo Hong),이준규(Jungyu Lee),김상철(Sangcheol Kim),정수경(Sookyung Jung) 한국실내환경학회 2011 한국실내환경학회지 Vol.8 No.4
There has been a growing concern about the emissions of formaldehyde and VOCs from automotive interior materials which could have an important impact on the in-vehicle air quality(IVAQ) of automotive vehicles. Many leading automobile manufacturers have now introduced their own specification standards for testing and limiting emissions from products produced by their suppliers. In addition, ISO (International Standard Organization) has been established ISO 12219-1, 2, 3, 4, 5 to determine the emissions of volatile organic compounds from automotive vehicle. The objective of this paper is to compare the area specific emission rates determined from surface emissions testing using the microchamber(MC) in comparison with a 1 ㎥ emission test chamber(ETC) operated in accordance with ISO 12219-3, ISO 12219-4. Measured emission concentrations in absolute terms were different between Microchamber and 1 ㎥ chamber. However, qualitative comparison of the chromatograms shows that the Microchamber is able to perform a screening test.
윈도우즈 운영체제 기반의 3D 가상 데스크톱 시스템 설계 및 구현
홍승표(Seungpyo Hong),오명진(Myeongjin Oh),신정훈(Junghoon Shin),이상준(Sangjun Lee) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.12
개인용 컴퓨터의 성능이 향상되면서 대부분의 컴퓨터 사용자에게 여러 개의 애플리케이션을 구동시키는 다중작업은 일반화되었다. 윈도우즈 운영체제는 다중작업중인 여러 애플리케이션을 구동할 작업공간을 오직 하나만 제공하고 있기 때문에 많은 사용자들이 불편함을 느끼고 있다. 본 논문에서는 이러한 윈도우즈 운영체제의 단점을 보완하여 윈도우즈 운영체제 환경에서 사용자에게 여러 작업공간을 제공하며, 리눅스 Compiz와 같이 사용자에게 화려하고 직관적인 UI(User Interface)를 제공하기 위해 DirectX를 이용하여 작업공간의 전환 과정을 3D 모션으로 보여줄 수 있는 3D 가상 데스크톱을 제안한다. As personal computers have been recently improved in performance, the multi tasking of running several applications at the same time has been generalized. Since only one task space is provided for performing such tasks on Windows operating system, a number of computer users feel inconvenient. In this paper, we propose a 3D Virtual Desktop System which can show a process of switching task spaces in 3D motion using DirectX. The proposed system can provide a computer user with more task spaces and the intuitive UI(User Interface) such as Compiz of Linux.
아동의 인지양식이 학업 자아개념 및 자기노출에 미치는 효과
홍승표(Hong, Seungpyo) 한국열린교육학회 2012 열린교육연구 Vol.20 No.1
본 연구는 아동의 인지양식이 학업 자아개념과 자기노출에 미치는 효과를 알아보고자 실시하였다. 인지양식(장독립형ㆍ장의존형)에 따라 학업 자아개념(학업 능력, 수업, 학업성취 자아개념)과 자기노출(부모, 친구, 교사와의 자기노출) 차이를 검증하기 위한 연구이다. 초등학교 6학년 76명 중 연구 대상에 적합한 45명을 대상으로 하였다. 집단잠입도형(GEFT) 척도를 통해 장독립형ㆍ장의존형 집단으로 각각 25, 20명씩 구성하였다. 활용된 검사도구는 학업 자아개념 검사도구와 자기노출 검사도구이다. 얻어진 자료를 바탕으로 집단간 평균 및 표준편차, 평균차이 검정(t-test)을 실시하였으며, 인지양식 집단별 학업 자아개념과 자기노출에 대한 상관분석을 실시하였다. 연구 결과, 인지양식에 따라 학업 자아개념은 통계적으로 유의한 차이를 보였다(p<.01). 자기노출에 있어서 통계적으로 부분적인 유의한 차이를 발견하였다. 또한 인지양식별 학업 자아개념과 자기노출에 상이한 정적 상관을 발견하였다. 연구 결과에 비추어 볼 때, 교수ㆍ학습현장에서 학습자의 인지양식에 적합한 교수활동을 전개하는 것이 바람직하며, 인지양식에 대한 새로운 시각과 적절한 교육적 활용이 요구된다. The purpose of this study was to identify the effects of children’s cognitive styles on academic self-concept and self-disclosure. According to cognitive styles (field independence and field dependence), the differences of academic self-concept (academic achievement, lessons, and academic achievement self-perception) and self-disclosure (exposures to parents, friends, and teachers) were examined. There were forty-five participants in this study who were all sixth graders of an elementary school. Through the group embedded figure test (GEFT), the participants were divided into two groups: the field independence group of twenty-five participants and field dependence group of twenty participants, respectively. An academic self-concept test and a self-disclosure test were carried out. Based on the data gathered, each group's means, standard variation, and t-test were calculated. A correlation between group academic self-concept and self-disclosure was also analyzed. The results show that there was a significant difference in academic self-concept (p<.01) and a slight significant difference in self-disclosure in terms of cognitive styles. There was also a positive correlation between academic self-concept and self-disclosure in terms of cognitive styles. To sum up, it is desirable that teaching activities which are appropriate to the learners' cognitive styles should be executed in the teaching and learning field. Also, proper educational applications and a new way of looking at cognitive styles are both required.
Seungpyo Hong(홍승표),Sejin Kim(김세진),Donghyun You(유동현) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
A control policy of a fly-scale flyer’s kinematics for stable flight toward a destination in various flow fields is obtained through an integrated framework of computational fluid dynamics (CFD) and deep reinforcement learning (deep-RL). As the flyer gets smaller, high-fidelity CFD is required as substitute for modeling aerodynamics around a flapping wing because of its unsteadiness and nonlinearity. While coupling with deep-RL to gain a control policy, the main challenge of adopting CFD is to obtain sufficient amount of data required for deep-RL due to high computational cost. In order to overcome data deficiency, a novel data reproduction method is devised. The focal point of the method is to reproduce diversified and huge amount of data from original one in terms of learning while maintaining the system dynamics unchanged. To get a control policy that works in various flow fields, multiple flyers are released in the environments with different flow speeds and share their experience with a deep-RL network. The learned network is able to make a decision on the flyer’s kinematics in temporally and spatially varying flows. The superior performance of the control policy is demonstrated through performing aerobatics in the complex flow field with abrupt disturbances.
신뢰적인 ARP 테이블의 운영을 통한 ARP 스푸핑 공격에 대한 효율적인 방어 기법
홍승표(Seungpyo Hong),오명진(Myeongjin Oh),이수연(Suyeon Lee),이상준(Sangjun Lee) 한국정보과학회 2011 정보과학회 컴퓨팅의 실제 논문지 Vol.17 No.1
ARP Spoofing 또는 ARP Poison이라 불리는 네트워크 공격은 다양하게 악용되는 해킹 기법으로 지속적으로 많은 피해를 일으키고 있다. ARP Spoofing 공격을 이용한 침해 사고를 예방하기 위해 많은 연구가 진행되었지만, 기존 프로토콜의 수정이나 고가의 장비 추가를 필요로 하기 때문에 실무에 적용하는데 어려움이 있다. 이에 본 논문에서는 기존 네트워크 프로토콜의 변경 없이 쉽게 적용 가능한 효율적인 ARP Spoofing 방어 기법을 제안한다. 제안된 기법은 MAC 주소 정보를 관리하는 MAC 에이전트와 ARP 테이블의 변조를 막는 클라이언트 에이전트를 서브넷에 설치함으로서 신뢰할 수 있는 MAC 주소 정보를 ARP 테이블에 자동적으로 갱신한다. ARP Spoofing, also known as ARP Poison, is the hacking method that is continuously abused in various ways. Although there were various researches on the prevention of damage caused by ARP Spoofing, these researches have the limitations that modifications of basic protocols or expensive additional equipments are required. In this paper, we propose the efficient prevention technique against ARP Spoofing attacks, which does not require the modifications in current network protocols. The proposed approach renews the reliable MAC address information to ARP tables automatically by installing MAC-Agent that manages MAC address information and Client-Agent that prevents modulation of ARP table.
이진모(Jinmo Lee),홍승표(Seungpyo Hong),유동현(Donghyun You) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Adaptation of functions and mechanisms of biological systems can lead to new and innovative designs in a variety of energy conversion and propulsion systems. The present research aims at designing biologically-inspired and optimized energy harvesting and propulsive kinematics for aero- or hydro-foils, blades, and propellers with active and/or passive deformation. The computational methodology combines a mass-conserving immersed-boundary method, which is capable of simulating flow over non-grid-conforming complex moving bodies and a structural dynamics method, which is based on a finite-element method and is capable of predicting time-accurate linear and non-linear dynamics of composite structures. The pressure and velocity of fluid and geometric information of submerged structures are timeaccurately coupled through an integration algorithm. The high-fidelity simulation capability for prediction of fluidstructure interaction, is employed to achieve the goal of developing biologically-inspired novel kinematics of a flexible foil.