비착용식 머리 위치 추적 기술 기반 디지털 아나모픽 작품 전시의 효과성 연구

장윤영,김주섭 한국디지털콘텐츠학회 2023 한국디지털콘텐츠학회논문지 Vol.24 No.6

Anamorphic art is based on optical illusions that can provide an expanded visual experience to engage viewers. Anamorphic artworks can be realized as VR experiences using head-mounted display (HMD) devices. However, works based on HMDs involve some limitations that can make viewing uncomfortable. In this study, we propose a digital anamorphic display for artwork based on head-tracking technology without a wearable device and verified its effectiveness experimentally. The proposed method minimizes the viewer's discomfort compared to using an HMD and can provide users with an experience of anamorphic artworks in a limited physical space. To investigate the effectiveness of viewing a digital anamorphic exhibition without a wearable device, 38 participants in their 20s and 30s evaluated an experience in terms of virtual presence and usability in comparison to viewing an exhibition with an HMD. The results showed that the proposed method provides high virtual presence with increased usability. 아나모픽 아트는 착시 기반 예술로 감상자에게 확장된 시각 경험을 제공하고 흥미를 불러일으킬 수 있다. 아나모픽 아트는 HMD를 사용하여 VR 아트 작품 형태로 구현될 수 있다. 하지만, HMD 기반의 작품은 사용자에게 관람시 불편함을 주는 제약을 지닌다. 본 논문에서는 비착용식 머리 위치 추적 기술 기반 디지털 아나모픽 작품 전시를 제안하고 그 효과성을 검증하였다. 제안하는 방식은 HMD 버전과 비교하여 관람자의 불편함을 최소화 하며 제한된 물리적 공간에서 아나모픽 작품을 체험하는 경험을 제공할 수 있다. 비착용식 디지털 아나모픽 전시 관람의 효과성을 알아보기 위하여 20~30대 실험 참가자 38명을 대상으로 가상 현존감 및 사용성 부분에서 HMD를 착용한 관람 방식과 비교 평가를 진행하였으며, 제안하는 방식이 사용성을 높이면서도 높은 가상 현존감을 동시에 제공함을 확인하였다.

Prediction of fracture parameters of circumferential through-wall cracks in the interface between an elbow and a pipe under internal pressure

장윤영,Jae-Uk Jeong,NAM-SU HUH 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9

This paper provides plastic influence functions of GE/EPRI method for calculating J and Crack opening displacement (COD) of pipes with a circumferential Through-wall crack (TWC) in the interface between an elbow and a straight pipe by using 3-dimensional (3-D) elastic-plastic finite element analyses for Ramberg-Osgood (R-O) materials, in which internal pressure was considered as a loading condition. The proposed plastic influence functions are tabulated as a function of the pipe geometries, crack length and strain hardening exponent. In order to provide sufficient confidence for the proposed plastic influence functions, the estimation scheme using the proposed plastic influence functions for J and COD of cracked elbows was validated against FE results using R-O parameters for the SA312 TP316 stainless steel. Moreover, the predicted J and COD for elbows with a TWC in the interface between an elbow and a pipe by the proposed scheme were compared with those for cracked straight pipes to investigate the effect of the elbow geometries on crack behavior of elbows. One important point is that crack behaviors in the interface between an elbow and a straight pipe can be significantly different with those in straight pipes according to pipe thickness, crack length and bend radius of elbows. Thus, the proposed plastic influence functions can be useful to predict accurate J and COD for cracked elbows.

GaAs MESFET의 파괴특성 향상을 위한 recess게이트 구조

장윤영,송정근 한국전기전자재료학회 1994 電氣電子材料學會誌 Vol.7 No.5

In this study we developed a program(DEVSIM) to simulate the two dimensional distribution of the electrostatic potential and the electric field of the arbitrary structure consisting of GaAs/AlGaAs semiconductor and metal as well as dielectric. By the comparision of the electric field distribution of GaAs MESFETs with the various recess gates we proposed a suitable device structure to improve the breakdown characteristics of MESFET. According to the results of simulation the breakdown characteristics were improved as the thickness of the active epitaxial layer was decreased. And the planar structure, which had the highly doped layer under the drain for the ohmic contact, was the worst because the highly doped layer prevented the space charge layer below the gate from extending to the drain, which produced the narrow spaced distribution of the electrostatic potential contours resulting in the high electric field near the drain end. Instead of the planar structure with the highly doped drain the recess gate structure having the highly doped epitaxial drain layer show the better breakdown characteristics by allowing the extention of the space charge layer to the drain. Especially, the structure in which the part of the drain epitaxial layer near the gate show the more improvement of the breakdown characteristics.

Crack-tip constraints of through-wall cracked pipes and its similarity to curved wide plates

장윤영,Jae-Uk Jeong,허남수,Ki-Seok Kim,Woo-Yeon Cho 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10

In the present study, the effects of pipe geometries, material properties and loading conditions on crack-tip constraints of pipes with circumferential Through-wall crack (TWC) were investigated via systematic 3-dimensional (3-D) Finite element (FE) analyses. The crack-tip constraints were quantified by Q-stress, and to characterize the elastic-plastic strain hardening material behavior, RambergOsgood (R-O) material was employed. Based on the FE results, it was observed that crack-tip constraints of pipes with TWC were dependent on crack length and thickness of pipe, however, the effects of each variables decreased as either thickness of pipe becomes thinner or crack length becomes longer. Moreover, the effects loading modes on Q-stresses for thin-walled pipes with TWC are negligible. Finally, the present Q-stresses of pipes were compared with those of Curved wide plate (CWP) in tension to address the similarity of crack-tip constraints between pipe and CWP, which could be used to produce the CWP to measure the fracture toughness of pipes accurately.

세무조사시 법적제도와 운영제도의 개선방안에 관한 연구

장윤영,박성배,이윤상 한국상업교육학회 2009 상업교육연구 Vol.23 No.3

본 연구의 목적은 세무조사시 법적제도와 운영제도의 문제점들에 대한 개선방안을 제시하는데 있다. 본 연구의 목적을 달성하기 위하여 세무조사제도를 세무조사의 법적제도, 세무조사의 운영으로 구분하여 문제점을 추출하였으며 일반납세자, 세무․회계전문가, 세무공무원 등 3개 집단을 대상으로 총 300부의 유효설문지를 회수하였다. 실증분석을 위하여 세무조사제도의 문제점에 대한 빈도분석과 연구대상자 3개 집단 간의 인식수준의 차이에 대한 분산분석(ANOVA)를 실시하고 사후검증으로 Tukey 검증방법을 사용하여 분석하였다. 본 연구의 결과를 구체적으로 정의하면 다음과 같다 첫째, 세무조사의 법적제도에서 협의에 의한 종결제도의 경우 세무공무원에게 해결 할 수 있는 대안권을 부여하여야 하며, 세무조사에 선정된 사유를 매출격감 등 구체적으로 기재하여야 할 것이다. 또한 세무조사를 임의로 세무공무원의 자의적 판단에 의해 실시 할 수 없도록 명확한 발동요건을 법에 규정할 필요가 있고, 조세범칙사건에 대한 조세범칙조사와 특별조사를 확실하게 구분하여 범칙조사의 요건과 절차를 현실화하여야 하며, 일반세무조사와 조세범칙조사에 대하여 세무조사의 절차에 대한 명확한 구분과 과세관청의 우월적 행위에 대한 적절한 처벌규정을 두어야 한다. 과세관청의 세무조사권의 남용을 방지하기 위해서는 민간기구의 세무조사권 방지위원회 등을 구성할 필요성이 있으며, 세무조사 사전통지를 현행의 조사개시 10일전에서 30일전으로 연장하여야 할 것이다. 둘째, 과세정보의 인프라구축이 과학적으로 이루어져야 하며, 국세청 조직의 운영은 경제규모의 확대 등을 고려하여 전문조사요원의 양성과 적정규모이상의 조사요원의 충원이 필요하며, 세무조사 선정에 있어서 무작위 추출방식에의 표본조사대상선정은 고소득 전문직 자영업자, 부동산 투기 등 탈세위험성이 높은 업종은 정기적으로 실시할 필요성이 있으며, 탈세위험성이 낮은 업종은 특별한 경우를 제외하고 최대한 축소하여야 한다. 세무조사 기간의 연장은 연장 사유를 범칙 관계 등 구체적으로 법에 규정할 필요가 있으며, 질의회신을 하는 경우 신뢰성을 향상시키기 위하여 국세청을 구속하는 행정처분에 대한 구체적인 규정을 두어야 할 것이다. 세무조사의 주기는 탈세위험성이 높은 업종을 미리 선별하여 분기별 또는 매년 등 세무조사의 주기를 짧게 하고 탈세 위험성이 낮은 업종은 길게 하여 차별화 할 필요성이 있다. The government has implemented tax reforms in many ways to simplify the procedure of the tax audit through systemizing the process by introducing scientific methods. However, there are still many problems to be solved. The efficiency of generating taxpayers' conformation to tax is not fully analyzed. Therefore, this study suggests the solutions on the improvements of tax audit system as follows through theoretical researches and guestionnaire survey about tax audit problems. First, regal systems of tax audit are suggested as follows. Systematic laws on tax audit should be introduced to prevent dispute in the course of tax audit, the reasons why they ought to be tax audit should be concrete, the procedure of tax audit should be considered according to the reality, the clear regulations should be stated to protect the rights of tax payers, a civil committee should be introduced to ban the abusive tax audit and the tax audit should be noticed at least 30days prior to its implementation. Second, operation system of the tax audit to lead tax payers' tax pay conformation is suggested as follows. The infrastructures of taxation information should be set up in a scientific way, the rate of tax audit should be kept unbiased, the tax audit officers should be raised and supplemented timely, random tax audits should be focused mainly on businesses of high rate of tax evasion and the cycle of tax audit on businesses should be differentiated according to the rate of tax evasion.

유류오염토양으로부터 발생하는 VOC가스처리를 위한 바이오스크러버 개발

장윤영,황경엽,곽재호,최대기 한국지하수토양환경학회 1997 지하수토양환경 Vol.2 No.1

Aiming at the treatment of large volumes of gas with a low concentration of poorly water soluble VOC(Volatile Organic Compound), a new system is proposed: the combination absorption tower/bioreactor. In the scrubber part of the bioscrubbing system, the contaminating compounds are absorbed in a aqueous phase. The contaminated scrubbing liquid is transported to the bioreactor, where the compounds are biodegraded by aerobic microorganisms (mainly to carbon dioxide, water, and biomass). In this study, separation of a volatile organic compound(VOC) out of a waste gas stream has been carried out using a re-cyclable high boiling point extrant(HBE). The liquid stream containing a high boiling point entrant(HBE) scrubs the gas stream in a direct gas-liquid countercurrent contacting operation in a packed tower for the removal of said component from the gaseous stream. A packed-bed column using Pall Ring was set up in order to simulate practical conditions for the scrubbing tower. The liquid stream transported to the bioreactor is recovered and recycled to the scrubber. The model gas, which contained 400 mg/$\textrm{m}^3$ of toluene, at a rate of 100 L/min, flowed into the packed column where the scrubbing liquid trickled over the packing in countercurrent to the rising gas at 10~15L/min. The bioscrubber designed for large volume air streams containing VOCs showed removal efficiency up to 80% in an optimum operating conditions during the tests fer removing toluene from an air stream by scrubbing the air stream with HBE. 저농도의 난 수용성 VOC가스가 포함되어 있는 다량의 오염가스를 처리하기 위하여 흡수탑과 생물반응기의 결합체인 새로운 처리시스템을 제시하였다. 바이오스크러버의 스크러버에서는 세정액으로 기상중의 처리대상오염물질의 흡수가 일어나며 세정액은 생물반응기로 이송되어 호기성 미생물이 오염물을 분해시킨다. 본 연구에서는 폐가스중의 VOC분리를 위하여 재순환가능한 고비점용매를 사용하였다. 고비점용매를 포함한 세정액은 기/액 향류접촉이 이루어지는 흡수탑의 충전층에서 폐가스중의 오염물을 분리한다. 흡수탑은 Pall ring충전제로 채워 실제공정을 모사 하고자 하였다. 흡수처리후 생물반응기로 이송된 흡수액은 재생 후 다시 흡수탑으로 재 순환하였다. 실험에 사용된 대상가스는 농도가 400 mg/$\textrm{m}^3$ 인 톨루엔으로, 세정액이 가스흐름과 향류로 약 10~15L/min의 유량으로 충전층을 적시며 내려오는 충전탑내부로 약 100 L/min의 유량으로 도입하였다. VOC처리를 위해 제작된 본 바이오스크러버에서 고비점용매를 이용한 연속실험결과 최적운전 조건에서 약 80%의 처리율을 얻을 수 있었다.

강경애의「 어머니와 딸 」연구

장윤영 상명대학교 대학원 1995 祥明論集 Vol.2 No.1

해안지역 유류저장시설에서의 오염확산 예측 모델링

장윤영,박선환 한국EHS평가학회 2006 한국EHS평가학회지 Vol.4 No.1

Removal of As(V) and Cr(VI) in aqueous solution by sand media simultaneously coated with Fe and Mn oxides

장윤영,Jae-Woo Lim,양재규 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1

In this research, sand media simultaneously coated with iron and manganese (iron and manganese coated sand, IMCS) were applied to treat synthetic wastewater contaminated with both Cr(VI) and As(V). Scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the surface properties of the coated layer of IMCS. Adsorption of Cr(VI) and As(V) onto IMCS followed a typical anionic type, showing a gradual decrease of adsorption as the solution pH increased. In a single system, IMCS showed a greater adsorption capacity for As(V) than that for Cr(VI) over the entire solution pH range. In a binary system, As(V) preferentially occupied the limited adsorption sites on IMCS and therefore Cr(VI) adsorption was suppressed. This result indicates that As(V) adsorption onto the surface of IMCS occurs through a strong chemical bonding such as an inner-sphere complex. As(V) adsorption onto the IMCS was well described by second-order kinetics. From the adsorption isotherm experiments at pH 4, the maximum adsorbed amount of Cr(VI) and As(V) onto IMCS in a single system was 102 mg/kg and 455 mg/kg, respectively.

Numerical investigation of the transferability of ductile fracture behavior between thin-walled surface-cracked pipe, curved wide plate (CWP) and single edge notched tension (SENT) specimens

장윤영,김익중,허남수,김기석,김영표 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9

Curved wide plate (CWP) and single edge notched tension (SENT) tests are commonly considered for determining the fracture toughnesses of high-strength line-pipe steel for the strain-based design. However, the tearing resistance relationship between these tests and actual thin-walled surface-cracked pipe has not been clearly established. The purpose of this study is to compare the crack growth characteristics of actual pipe, CWP and SENT using the local damage method, which is based on the Gurson-Tvergaard-Needleman (GTN) model. Small-scale testing of smooth round bar tensile and SENT specimens provides the information required to calibrate the damage parameters of the GTN model. Crack growth simulations are then conducted using the calibrated GTN model to evaluate the tearing resistance behaviors of various geometries. The tearing resistances of the CWP and the actual pipe are similar, whereas the SENT specimen exhibits a higher stress triaxiality. However, this tendency of SENT specimen changes as the crack propagates, which is related to the conservatism of the crack growth resistance curve. Therefore, it is necessary to identify the SENT test specimen usability and limitation via ductile damage simulations.