• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.723-728
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• 1997

The aim of this study is to define the physical properties of successive pours surfaces of concrete by various surface treatment methods with the laps of time. This paper is intended to study on the physical properties (the compressive strength, the tensile strength, the shear bonding strength and the bending strength) of the concrete successive pours surface used concrete surface finishing agent.

• 센서학회지
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• 제15권3호
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• pp.192-198
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• 2006

In this study, the light addressable potentiometric sensors (LAPS) with $Si_{3}N_{4}/SiO_{2}/Si$, and $Ta_{2}O_{5}/SiO_{2}/Si$ structures were fabricated. The penicillinsae was immobilized on the devices to hydrolyze the penicillin using self-assembled monolayer (SAM) method. Then response characteristics according to the penicillin concentrations were measured and compared. The measuring system was simplified by using LabVIEW. The pH response characteristics of fabricated devices are 56 mV/pH ($Si_{3}N_{4}$ sensing membrane) and 61 mV/pH ($Ta_{2}O_{5}$ sensing membrane). The sensitivity of sensor by enzyme reaction result of the enzyme reaction were 60 mV/decade and 74 mV/decade for $Si_{3}N_{4}/SiO_{2}/Si$ and $Ta_{2}O_{5}/SiO_{2}/Si$ structure, respectively, in the range of $0.1\;mM{\sim}10\;mM $of the penicillin concentration.

• 한국대기환경학회지
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• 제30권2호
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• pp.119-127
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• 2014

A very high resolution weather analysis system (VHRAS) of 50 m horizontal resolution is established based on LAPS. VHRAS utilizes the 3 hourly forecast data of the Unified Model (UM) of the Korea Meteorological Administration (KMA) with the horizontal resolution of 12 km as initial guess fields. The analysis system ingests the automatic weather station (AWS) data as input observations. The analysis system operates every hour for Seoul, Korea region in real time basis. It takes less than 10 minutes for one analysis cycle. The size of grid of the analysis domain is $800{\times}660$, respectively. The analysis results from December 2010 to February 2011 showed that the mean biases of temperature, maximum and minimum temperature were -0.07, 1.6, $0.2^{\circ}C$, respectively. The temperature in the central part of the city revealed relatively higher value than that of the surrounding mountainous areas, which showed a heat island feature. The heat island appears in zonal direction since the central city region is developed along a large river. Along the heat island, the eastern region was warmer than the western region. The warmer temperature in the western part of the heat island was caused by anthropogenic heat change in conjunction with the change of land use. This system will provide more reliable weather data and information in Seoul.

• 한국엔터테인먼트산업학회논문지
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• 제15권8호
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• pp.91-106
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• 2021

본 연구의 목적은 콘텐츠 기획과 제작, 유통의 과정을 통해 자기실현과 사회적 연대를 이끌어내는 과정을 콘텐츠 액티비즘으로 정의하고, 구체적인 실행 단계를 유형화하는 것이다. 이를 토대로 구체적인 사례 분석을 시도함으로써 콘텐츠 액티비즘의 실천이 갖는 사회적 의미와 효과를 규명하고자 한다. 연구 방법은 선행 연구 검토를 통해 전통적 액티비즘과 콘텐츠 액티비즘의 차이를 살펴본 후 콘텐츠 액티비즘의 구체적인 실행 과정을 7단계로 유형화하였다. 콘텐츠 액티비즘의 실행모델은 1)문제의 발견, 2)현상 인식과 정보의 수집, 3)액티비즘 대상 및 목적 설계, 4)콘텐츠 기획과 제작, 5)콘텐츠 유통과 확산, 6)액티비즘 참여 및 효과 공유, 7)지속적인 액티비즘 과제 검토 등 7단계로 유형화하였다. 이 모델을 적용하여 본 연구에서는 콘텐츠 액티비즘 사례 두 가지를 분석하였다. 첫 번째 사례는 코로나19의 공포가 확산되던 2020년 초, 100세 생일을 앞둔 노인이 기획한 뒷마당 100바퀴 챌린지이다. 영국에 사는 톰 무어 경은 국가보건서비스 소속 의료진들이 보호장비가 부족하여 코로나 감염과 사망이 증가하자, 이들을 돕기 위해 뒷마당 100바퀴 걷기에 도전했다. 암 수술과 낙상 후유증으로 보조기 없이 보행이 어려운 그의 도전은 많은 이들의 공감과 참여를 이끌어내면서 글로벌 연대를 이끌어냈다. 두 번째 사례는 2019 일본 아이치트리엔날레 기획전시 김서경, 김운성 작가의 '표현의 부자유, 그 후'를 분석한 다. '표현의 부자유, 그 후' 전시는 평화의 소녀상과 일본군 위안부 할머니들의 삶을 전시하는 프로젝트였으나 극우 세력들의 협박과 공격으로 전시 3일 만에 철회되었다. 이 소식을 들은 해외의 예술가들은 트리엔날레의 결정에 저항하며 트위터와 인스타그램 등 소셜미디어에 소녀상과 같은 포즈로 사진을 찍고 공유하면서 평화의 소녀상이 갖는 역사적 의미에 공감했다. 예술가들로부터 시작된 액티비즘은 소셜미디어를 통해 다양한 지역에 사는 평범한 시민들의 집과 일터, 거리로 확장되었다. 두 사례는 콘텐츠를 통해 누군가와 연대하고 소통하면서 사회적 실천을 이끌어낸 콘텐츠 액티비즘이라고 할 수 있다. 이처럼 콘텐츠 액티비즘은 소셜미디어 시대의 새로운 리터러시이자 윤리적 실천의 도구가 되고 있다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1990년도 봄 학술발표회 논문집
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• pp.45-50
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• 1990

The purpose of this study was to find, through field and questionaire survey, the problems in arrngement of reinforcing bars in wall-slab type apartment buildings. The survey was done in 88 construction sites over the country. The findings from the survey were as followed : (1) reinforcement details were unnecessarily complex in some structural members and could be simplified without sacrificing the safety of the structures; (2) It was found in many cases that drawings of reiforcement failed to show the location of the laps, bent-up positions, and the development length; and (3) it was often found that the workers did not understand the importance of tloerence limits and anchorage in the steel bar arrangement.

• The Korean Journal of Ecology
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• 제15권4호
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• pp.387-394
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• 1992

Decomposition in the litteras of platanus orientalis was studied by month in the dam of seoul national university. total amounts of the litter had the tendency to decrease with the laps of the time. Those of crude protein and phosphate contents, however, increased much more than initial amounts. It was throught that the growth of aquatic microbes gave rise to increase them. Dry weight, organic matter and holocellulose tended to decreased gradually. But, the amount of calcium loss increased rapidly since march and then the amoung of potassium and sodium decreased slowly. It was thought that this changing pattern was ascribed to water temperature, the growth of aquaqtic microbes and the leaching of soluble parts by stream current.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2203-2206
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• 2005

A load flow and short circuit fault simulation of AC electrified railway distribution systems is presented with DIgSILENT PowerFactory software. Load flow of electrified railways distribution system with concerning multi train lines and dynamic characteristics of train load is studied for different time laps. The dynamic characteristics of train load in starting and braking conditions with different starting and stopping times and its moving positions makes the load flow complicated so there is a great need in studying the effects of electrified railways on load flow. Short circuit fault transients is also studied and simulated for both power system or traction distribution system and their effects on the operation of the train sets is investigated.

• 한국염색가공학회지
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• 제12권1호
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• pp.17-24
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• 2000

The tensile properties of polyester warp knitted fabrics of satin and reverse satin structure with various lengths of underlap were studied. In the range of low tension, the satin warp knitted fabric showed larger tensile energy and elongation in the direction of $0^\circ$ and larger tensile linearity, tensile resilience and initial modulus in $90^\circ$. Meanwhile, reverse satin one showed larger initial moduli in 0$^{\circ}$ and larger the others in $90^\circ$. In the range of high tension, the tendencies of both fabrics in $0^\circ$ direction were almost the same as those in all direction. As the under laps were shorter for both fabrics, tensile linearity, tensile energy and elongation increased, but tensile resilience decreased in all directions. However initial moduli were changed little.

• 한국생산제조학회지
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• 제5권4호
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• pp.121-128
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• 1996

In order to examine spindle deformation characteristics that affects the performance of dynmic cutting acuracy due to tool weight variation in a experimental spindle. thermal deformation value of operrative spindle by the axial displacement and the radial run out was measured according to the rise of spindle temperature through the laps of operation time and the change of rotational speed under the tool weight variation. A qualitative summary is as follows ; 1) The results show that the tool weight affcets the spindle temperature variation in a experimental spindle. 2) Radial run out and axial displacement was measured according to the rise of the spindle temperature and the performance of dynamic cutting accuracy was affected by the tool weight variation. 3) Axial displacement is 1.3 times larger than the radial run out in a experimental spindle conditions. 4) Axial displacement is continuously elongated when the tool weight is repeatly exchanged since the spindle themal deformaion, however, when the same tool weight is used. the displacement is still constant.

• 지구물리와물리탐사
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• 제2권3호
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• pp.154-158
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• 1999

본 논문에서는 부분 윤곽선 추출기법을 이용하여 다중 시차 영상을 위한 자동 변화 추적 시스템의 속도를 증가시키고자 한다. 기존의 변화 추적 시스템에서는 전체 영상에서 윤곽선을 추출하여 사용하였으나, 본 연구에서는 윤곽선 추출이 필요한 부분을 미리 선택하여 이 부분에서만 윤곽선을 추출하게 함으로써 처리 속도를 향상시킬 수 있었다. 따라서 본 시스템은 특히 위성 영상 자료나 물리 탐사 자료 등의 방대한 영상 자료에서의 변화 탐지와 추적, 정량적인 분석 등을 위해 효과적으로 활용될 수 있을 것으로 기대된다.