• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2003년도 하계학술연구발표회 및 한.일 공동심포지엄
• /
• pp.260-261
• /
• 2003

It is recognized that the magnetization reverses with a sequence of discrete and jerky jumps, known as the Barkhausen effect. Recently, interest in the Barkhausen effect has grown as it is a good example of dynamical critical behavior, evidenced by experimental observation of a power law distribution of the Barkhausen jump size. So far, most experimental studies have been carried out on bulk samples using a classical inductive technique, which is difficult to apply to thin film samples mainly due to the ]ow signal intensity. For this reason, very few experiments have been done on two-dimensional ferromagnetic thin films. In this talk, we report a direct domain observation of Barkhausen avalanche at criticality in Co and MnAs thin films investigated by means of a magnetooptical microscope magnetometer (MOMM), capable of time-resolved domain observation with an image grabbing rate of 30 frames/s in real time. In Fig. 1, we demonstrate a series of six representative domain-evolution patterns of 25-nm Co film observed successively by means of the MOMM, where one can directly witness Barkhausen avalanche.

• 대한인간공학회지
• /
• 제29권4호
• /
• pp.647-654
• /
• 2010

In a service environment, the spatial layout is an important factor that has a great impact on customers' behavioral characteristics including wayfinding and purchasing. Previous studies have shown a gap between marketing, focusing solely on profitability and satisfaction, and architecture, looking only into efficiency of pedestrian flow. To balance such disparity, this study suggests an integrated approach for assessing behavioral patterns in complex service environments. With the objective that complex service environments should aim to increase its profitability and efficiency while guaranteeing customer satisfaction, quantitative metrics was developed for evaluation. The metrics was defined to use data from behavior observation including path tracking, population counting, and gaze analysis, while previous studies have relied on abstract survey methods that were prone to sampling errors and loss of data. For validation of the metrics in a real world setting, a case study was conducted at 4 train stations in Korea. In the case study, experiments were conducted to gather the required data in all 4 train stations, while their physical layouts were also analyzed. With the results from the case study, comparative evaluation of the 4 train stations in terms of behavioral efficiency was possible, together with a discussion on the effect of their physical settings.

• 대한인간공학회지
• /
• 제30권5호
• /
• pp.629-636
• /
• 2011

Objective: The aim of this study is developing an elderly automatic showering system by optimizing nozzle position and angle of water injection on ergonomics approach. Background: The elderly living in nursing home or hospital were increased by an aging population. Helping the elderly on showering is so hard. In addition, the existing showering/bathing systems are not effective because shower pattern of the elderly and washed range of nozzle were not considered. Method: Firstly, basic specification were determined by anthropometric approach. Secondly, position of nozzle and angle of water injection were determined through observation of elderly behavior on showering. And, finally, they were optimized by washing test and showering simulation. Results: On showering importance of body parts were able to analysis through observation of elderly behavior. The position of nozzle and angle of water injection was able to optimize by showering simulation. The automatic showering system was developed by considering their results. Conclusion: The most important technology of developing a showering system is the determining position of nozzle and angle of water injection, number of nozzle. It was developed by applying its results through user centered-research. Application: The user centered-research of developing products was able to apply directly to develop automatic bath, showering products etc. Further more it was available to apply senior friendly products.

• 한국세라믹학회지
• /
• 제29권12호
• /
• pp.949-955
• /
• 1992

R-curves, fracture resistance (KR) as a function of crack extension (Δa), of a gas-pressure sintered monolithic Si3N4 were determined by controlled flaw/strength technique. Rising R-curve behavior was observed, confirming the operation of microstructural toughening process during crack growth. The R-curve parameters, k and m in the equation, KR=k(Δa)m, were determined to 30.301 and 0.1146, respectively. Microstructural observation of growing crack revealed that the bridging in the crack wake by unbroken ligament of large elongated ${\beta}$-grains was the mechanism primarily for the rising R-curve behavior.

• 한국연소학회:학술대회논문집
• /
• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
• /
• pp.111-114
• /
• 2012

The ignition behavior of single coal particles of five kindes of coal with different ranks (low volatile bituminous, low volatile sub-bituminous, high volatile bituminous, lignite) with particle size of $150-200{\mu}m$ was investigated at high heating rate condition. Particles were injected into a laminar flow reactor and the ignition behavior was observed with high speed cinematography. Sub-bituminous were observed to ignite homogeneously; however, low volatile bituminous coal and lignite undergo fragmentation prior to igntion. The observation was analyzed with previous work.

• 지능정보연구
• /
• 제17권2호
• /
• pp.77-96
• /
• 2011

전시회는 전시업체가 새로운 상품이나 서비스를 관람객에게 알리기 위해 개최되는 것으로 효과적인 마케팅 수단으로 중요한 역할을 수행한다. 이처럼 전시회의 중요성이 점점 커짐에 따라, 국내 전시 산업은 많은 양적 성장을 이뤄왔다. 그러나, 양적 성장에 비해 전시 산업의 질적 성장은 이에 미치지 못하는 실정이다. 따라서 전시회의 질정 성장을 이루기 위해서는 관람객의 행동 패턴을 이해하여 관람객들의 전시 관람 수준과 만족도를 높일 필요성이 있다. 본 연구에서는 관람객들의 전시 관람 행동 패턴을 분석하기 위해 다음과 같은 연구 프레임워크를 사용한다. 첫 번째 단계는 본 연구의 방법론을 적용하기 적합한 전시회를 선정하는 단계이다. 두 번째 단계는 관찰 조사 방법을 수행하는 단계이다. 마지막 세 번째 단계는 수집된 자료들을 분석하는 단계이다. 분석 단계에서는 부스들의 개별 특성을 파악하였고, 더 나아가 관람객들의 전시 관람 행동 패턴을 분석하기 위해 데이터마이닝 기법을 사용하였다. 본 연구의 결과는 전시 기획자에게 유용한 정보를 제공할 뿐만 아니라 참관객들이 원하는 정보를 원하는 방식으로 제공하는 개인화서비스를 가능하게 하여 궁극적으로 전시회 관람의 질과 만족도를 크게 향상시킬 수 있을 것이라고 기대한다.

• 아동학회지
• /
• 제20권3호
• /
• pp.275-291
• /
• 1999

The effect of prosocial story telling and discussion on the development of children's helping and sharing behaviors and prosocial reasoning was studied. Subjects were 36 five-year-old kindergarten children assigned to control or experimental groups. The research design consisted of a pre-test and pre-observation, 6 week intervention, and post-test and post-observation. Data were collected by means of a video camera and analyzed by adjusted means and ANCOVA, using the SPSS/PC+. Both children's helping behavior and prosocial reasoning was higher in the group exposed to prosocial story telling with discussion as compared with the group with story telling only and the control group.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2004년도 학술발표회
• /
• pp.705-708
• /
• 2004

The spatial variability of the L- and C- band large scale remotely sensed soil moisture data, obtained during tire Southern Great Plain 1999 (SGP'99), was characterized. The results demonstrate that soil moisture data using L-band show the break in statistical symmetry (multiscaling behavior) with the variation of scale of observation, which is similar to that of the soil property such as sand content. Also, soil moisture data using C-band show single scaling behavior with the variation of scale of observation, which Is similar to that of the vegetation condition.

• 산업경영시스템학회지
• /
• 제33권2호
• /
• pp.105-111
• /
• 2010

The purpose of this study was to detect early children with hyperactivity which is one of the symptoms of Attention Deficit-Hyperactivity Disorder (ADHD). This study used two methods: K-CBCL and observation of children's behavior. K-CBCL was done online by parents at home. For observation of children's behavior, the school asked children to wear a 3-axis accelerometer on their wrists. The data from K-CBCL and 3-axis accelerometer were analyzed and clustered to separate hypersensitive children from ordinary children. This experiment confirmed that 3-axis accelerometer which is one of Ubiquitous techniques and the K-CBCL questionnaire were helpful for detection of hypersensitive children.

• 한국주거학회논문집
• /
• 제12권3호
• /
• pp.1-12
• /
• 2001

The purpose of this study was to investigate the outdoor space of the recent built apartment complex in Ulsan and to provide the basic information for planning and apartment outdoor space. Multiple methods were utilized such as questionnaire, observation, behavior-mapping, and photography. The sample consisted of 382 residents living in four apartment complex in Ulsan. data were analyzed by frequency and percentage using SPSS PC+. The observation was performed in seven outdoor space, i.e., green area, road area, exercise area, play area, parking area, and approach area. According to the findings of this study, residents did not actively involve in outdoor activities and seldom use the outdoor space. Various changes and erosions were observed as a trace, especially near fence and grass area because of unplanned location of entrances. Finally this study suggested several planning guidelines for outdoor space in apartment complex.