• Korean Journal of Child Studies
• /
• v.22 no.1
• /
• pp.97-107
• /
• 2001

This study argues the nature of the microgenetic method in respect to child development research and explores its merits and limitations. The microgenetic method focuses on observations that span the entire period from the beginning of developmental change to the time it reaches a relatively stable state. This produces a high density of observations relative to the rate of change in the phenomenon. In this way, observed behavior may be used in intensive trial-by-trial analysis. The microgenetic method is superior to other methods in the possibilities for observing developmental changes as they occur, examining various aspects of change, detecting variability in behavior, and flexibility in application regardless of theoretical perspectives. Limitations of this method include reliability problems due to repeated observations, artificiality relative to the natural situation, inconsistency of short-and long-term change, and demands on children's motivation for participation in research.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2001.04a
• /
• pp.807-810
• /
• 2001

Fatigue crack growth tests were carried out using high manganese cast steel under constant amplitude loading. Crystal grain size of the material is about 1000$\mu\textrm{m}$. For this material, the fatigue crack growth mechanism of high manganese steel was clarified from results such as observation of crack growth path and fracture surface. $\Delta$$K_{th}$ is about 8MPa$\surd$m which is quiet large as compared to the general structural steels and the crack growth rate is lower than the general structural steels especilly in the low $\Delta$K regsion. The reason of this behavior is crack closure due to fracture surface roughness.

• Journal of the Korean Institute of Rural Architecture
• /
• v.1 no.3
• /
• pp.87-96
• /
• 1999

The first objective is find out some life styles on the aged by the actual condition of the daily living activities in old people's home and recuperation facilities. The second objective of this study is to clarify the living behavior patterns of the aged who are under recuperation and living by behavioral places. The thorough investigation and observation works were made to them from the view points of daily living behaviors and activities of the recuperating aged. This article discusses about the basic characteristics of the aged and the actual condition of the daily living activities of the aged in old people's home and recuperation facilities.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2003.05a
• /
• pp.197-203
• /
• 2003

Korea Highway Corporation(KHC) began the ambitious KHC Test Road construction project from 1997. It is 7.7km long two-lane highway next to the mainline of Jungbu Inland Expressway. The KHC Test Road construction was completed at the December 2002. It is composed of twenty-five PCC test pavement sections. Section design parameters are (1) concrete slab thickness, (2) base type, (3) base thickness (12, 15, and 18cm), and (4) pavement type. Twenty-five PCC test pavement sections contain 1241 sensors to evaluate the behavior of pavement system under traffic load and environmental change. The behavior of pavement systems will be identified by the observation of sensor measurement and pavement distress survey from test pavement sections. The Test Road research outcome will validate the Korean Pavement Design Guide which is develop by on-going funded research from the Ministry of Construction and Transportation.

• 한국HCI학회:학술대회논문집
• /
• 2006.02b
• /
• pp.334-339
• /
• 2006

주거환경의 변화는 주거공간을 구성하고 있는 제품을 더 이상 독립된 구조가 아닌 서로 네트워크로 연결된 하나의 제품 및 서비스로 인식될 필요성을 나타내고 있다. 따라서, 제품 및 서비스 컨셉 도출을 위한 사용자 조사 단계에서 사용자의 행위 관찰 시, 관찰의 범위가 기존의 개별 제품을 사용하는 환경 중심에서 전체 제품을 사용하는 환경으로 확장 될 필요가 있다. 본 연구에서는 주거공간에서 제품 사용의 관찰범위를 개별제품사용환경과 전체제품사용환경으로 분류하여 각각의 관찰범위에서의 사용자 행위 분석 데이터가 어떠한 차이를 갖는지 관찰법(Ethnography)을 이용한 사례연구를 통해 비교 분석하였다. 본 연구의 결과는 추후 주거환경을 구성하는 제품 및 서비스 개발 시 목적에 적합한 관찰범위를 선택하는데 있어 도움이 될 것이며, 기반이 되는 자료로 활용될 수 있을 것이다.

• Journal of the Korean Society of Safety
• /
• v.31 no.1
• /
• pp.132-138
• /
• 2016

The purpose of this study was to develop safety competences, a set of behavioral indicators of each competence and measuring methods of behavioral indicators for preventing human error of nuclear power plants(NPPs). The safety competences and behavioral indicators were derived from the five steps consisted of derivation of preliminary competence items through literature review, content analysis, interview(FGI, BEI), examination of content validity and decision making of final indicators. The results showed that 13 core safety competences and 35 behavior indicators were derived finally. In addition, the methods of measuring safety competences or behavioral indicators such as Behaviorally Anchored Rating Scale (BARS), Behavior Observation Scale (BOS) were developed and suggested.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2017.05a
• /
• pp.151.1-151.1
• /
• 2017

This work studied the corrosion behavior of AZ31 Mg alloy galvanically coupled with Cu during immersion in 0.1 and 0.5 M NaCl solutions by in-situ observation and galvanic corrosion current measurement using a zero resistance ammeter. The corrosion behavior of AZ31 Mg alloy was also studied by salt spray test. The average galvanic corrosion density during 2 h immersion in 0.1 NaCl solution was found to decrease as an exponential function with increasing the surface area ratios between AZ31:Cu or with increasing the distance between AZ31 and Cu. The corrosion of electrodeposited Cu on AZ31 Mg alloy was concentrated at the area next to Cu (about 5 mm for immersion test and 2 mm for salt spray test) and pitting corrosion was accelerated at the area beyond the severely corroded area by the galvanic coupling effect.

• Journal of the Korean Society of Combustion
• /
• v.15 no.2
• /
• pp.19-26
• /
• 2010

Combustion behavior of pulverized coal particles in a post-combustion gas reactor was investigated. Radiation emission from coal particles were analyzed by direct photograph and $CH^*$ radical chemiluminescence intensity. Coal particles were sampled during the combustion and were observed by scanning electron microscopy (SEM) and cross section micrograpy technique. Two coal types(one bituminous and one subbituminous coals typically used in the Korean power plants) were tested at typical combustion environment. Gas flow conditions were controlled to represent temperature and oxygen concentration. Experimental data were discussed along with conceptual descriptions of pulverized coal combustion, where particle heat-up, release and combustion of volatiles, and char combustion were sequentially progressed.

• Journal of Biomedical Engineering Research
• /
• v.15 no.4
• /
• pp.389-394
• /
• 1994

The age-hardening behavior and the structural changes in a commercial dental Au-Ag-Cu-Pd alloy were investigated by means of hardness test, optical and scanning electron microscopic observation, energy dispersive spectroscopy and X-ray diffraction study. The drastic reduction in hardness by prolonged aging occurred after a rapid increase in hardness at the initial stage by the isothermal aging at $350^{\circ}C$. This softening was due to the broad precipitates formation of the lamellar structure which was composed of the f.c.t. AuCu I ordered f.c.t. phase containing Pd and the f.c.c. Ag-rich $\alpha$1 solid solution f.c.c.phase containing Au.

• Journal of the Korean Ceramic Society
• /
• v.26 no.6
• /
• pp.789-794
• /
• 1989

The high-temperature strength of Ce-TZP was measured at 200, 650 and 100$0^{\circ}C$ by 4-point bending test. And its fracture behavior was observed by SEM. Below $650^{\circ}C$ of the temperature, where monoclinic fraction was almost zero, the decreasing rate of bending strength was relatively slow, but above this temperature, high temperature strength was largely decreased as a result of the decrease of stress-induced transformation of zirconia. The observation of fracture surface bended at 100$0^{\circ}C$ indicated that the fracture mode changed from intergranular-into transgranular-form with regardless of ceria contents.