• 한국융합학회논문지
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• 제12권8호
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• pp.67-75
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• 2021

본 연구는 50-69세의 저소득 1인 가구를 대상으로 그들의 자존감에 미치는 영향요인을 확인하기 위하여 시행되었다. 분석대상은 보건복지부에서 제공하는 2019년 복지패널자료로부터 50-69세 저소득 1인 가구에 해당하는 233명이었다. 연구방법은 자존감을 종속변수로 하고, 관계만족도와 생활만족도를 독립변수로 정의한 후, 구조방정식 모형을 이용하여 분석하였다. 분석결과, 관계만족도는 경로계수 0.24로 자존감에 직접적으로 영향을 나타내지 않았다. 그러나, 관계만족도는 경로계수 0.71로 생활만족도에 긍정적 영향을 주었고, 생활만족도는 경로계수 0.46으로 자존감에 유의미하게 긍정적 직접영향을 나타내었다. 또한 생활만족도가 관계만족도와 자존감에 경로계수 0.32로 매개효과를 미치고 있는 것으로 나타났다. 그러므로, 열악한 1인 가구를 지원하는 전략을 세울 때, 정책입안자들은 관계만족도와 생활만족도를 개선시키는 방법을 고려해야 할 것이다.

• 한국융합학회논문지
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• 제9권4호
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• pp.99-110
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• 2018

저자들은 2008년부터 2016년까지 고대의료원 구로병원 예방치과 구취클리닉에 내원한 구취 환자 중, 생리적 구취증 환자 171명에 대한 진료기록을 통하여 구취에 영향을 줄 수 있다고 인정되는 11개 독립변수들의 자료를 수집하였다. 이들 11개 독립변수들과 3개 종속변수들 중, 생리적 구취 발생에 융복합적 영향을 미치는 공통요인을 추출하여, 향후 구취 예방을 위한 구강보건교육자료 제작 등에 활용할 목적으로 본 연구를 시작하였다. 생리적 구취 발생과 밀접한 연관성이 있다고 알려진 안정 시 타액량, 타액 완충능, 타액 침전율의 3개 종속변수에 11개 독립변수들이 미치는 영향력을 다중회귀분석과 경로분석을 이용하여 분석하였고, 각 변수들의 기술통계적인 결과 분석과 함께, 3개 종속변수에 통계적으로 유의하게 직접, 간접적으로 영향을 미치는 공통적인 융복합적 독립변수 요인들을 추출한 결과, 성별, 식음규칙성, 성격, 조식섭식습관의 네가지 요인이 추출되었다.

• 한국기계가공학회지
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• 제3권4호
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• pp.88-94
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• 2004

High manganese steel was maintained stability of Non-Magnetics performance. Fatigue tests were carried out under constant stress amplitude, using a non-magnetic high manganese steel. The fatigue crack growth mechanism of the high manganese steel was clarified from results such as observation of crack growth path and fracture surface. The result of getting this study was shown as following: 1) Remarkably ${\Delta}Kth$ of the high manganese steel is big with about 3 times of the general steel product. 2) In the low ${\Delta}K$ value region, da/dN is dependent on Kmax, and in the high ${\Delta}K$ value region, it is dependent on ${\Delta}Keff$. The reason of this behavior is crack closure due to fracture surface roughness and fretting oxide. 3) It seems to ease the stress concentration of crack tip crack growth behavior in the ${\Delta}Kth$ vicinity by the generation of the secondary crack.

• Applied Science and Convergence Technology
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• 제23권6호
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• pp.317-327
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• 2014

In order to develop nano-devices with much lower power consumption for beyond-CMOS applications, the fundamental understanding and precise control of the electronic properties of ultrathin transition metal oxide (TMO) films are strongly required. The metal-insulator transition (MIT) is not only an important issue in solid state physics, but also a useful phenomenon for device applications like switching or memory devices. For potential use in such application, the electronic structures of MIT, observed for TMO nano-structures, have been investigated using a synchrotron radiation angle-resolved photoelectron spectroscopy system combined with a laser molecular beam epitaxy chamber and a scanning photoelectron microscopy system with 70 nm spatial resolution. In this review article, electronic structures revealed by soft X-ray nano-spectroscopy are presented for i) polarity-dependent MIT and thickness-dependent MIT of TMO ultrathin films of $LaAlO_3/SrTiO_3$ and $SrVO_3/SrTiO_3$, respectively, and ii) electric field-induced MIT of TMO nano-structures showing resistance switching behaviors due to interfacial redox reactions and/or filamentary path formation. These electronic structures have been successfully correlated with the electrical properties of nano-structured films and nano-devices.

• 대한산업공학회지
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• 제28권3호
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• pp.264-273
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• 2002

This paper focuses on disassembly sequencing, which is the problem of determining the optimum disassembly level and the corresponding disassembly sequence for a product at its end-of-life with the objective of maximizing the overall profit. In particular, sequence-dependent operation times, which frequently occur in practice due to tool-changeover, part reorientation, etc, are considered in the parallel disassembly environment. To represent the problem, a modified directed graph of assembly states is suggested as an extension of the existing extended process graph. Based on the directed graph, the problem is transformed into the shortest path problem and formulated as a linear programming model that can be solved straightforwardly with standard techniques. A case study on a photocopier was done and the results are reported.

• 한국산학기술학회논문지
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• 제8권4호
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• pp.821-825
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• 2007

본 연구에서는 응력이력 의존적 소성포텐셜을 도입한 단일 경화 모델의 검증을 정규압밀, 약간 과압밀, 심한 과압밀 점토시료에 대하여 수행하였다. 단일 경화 모델은 한계상태 토질역학을 기본으로 비교적 적은 매개변수를 채택하여 최근에 개발된 탄소성 모델이다. 삼축압축시험이 정밀하게 수행되었으며 시험결과는 모델의 예측결과와 전반적으로 잘 부합하였다. 시험결과와의 차이는 단일 경화 모델이 주로 주응력 회전을 강조하기 때문이다. 그러나 소성일 H 및 주응력 회전각 변수를 통하여 지반재료에서 응력이력을 효과적으로 소성일에 반영할 수 있다는 사실이 검증되었다.

• 한국농공학회지
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• 제30권4호
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• pp.134-153
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• 1988

This paper was carried out to investigate the existence of a unique stress- strain behavior by obtaining some factors influencing the time dependent stress- strain behavior of clay. The results obtained from this study were summarized as follows ; 1. The relationship between stress ratro and strain in normally consolidated clay was in- dependent on pre-shear consolidation pressure. Therefore, shear strain could be expressed as a function with stress ratio. 2. The constitutive equation of shear strain on Modified Carn Clay Model coincided better with the observed value than Cam Clay Model. 3. The relationships between deviator stress and shear strain, between pore water pressure and shear strain were unified by the mean equivalent pressure. 4. The shear strain contour in norrnally consolidated clay was increased linearly through origin, but that in overconsolidated clay was not in accordance with the result of the former. 5. Because the effective stress path of normally consolidated clay was unified by the mean equivalent pressure, state boundary surface in (e,p,q) space was transformed into two dimensional surface. But it was considered to be suitable that the unified stress- strain in overconsolidated clay be expressed by a function with overconsolidation ratio. 6. The deviator for constant strain was increased linearly with increment of strain rate ($\varepsilon$) on semi-log scale, but pore water pressure was decreased. 7. The behavior of stress relaxation was transformed from linear to curvilinear with inc - rement of strain rate before stress relaxation test, and pore water pressure was increased in total range. 8. The strain of creep was increased linearly with increment of time on semi-log scale. The greater the strain rate before creep test became, the greater the increment of strain of creep became. And the pore water pressure during creep test was increased generally with increment of time on semi-log scale.

• 한국심리학회지 : 문화 및 사회문제
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• 제15권4호
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• pp.547-563
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• 2009

본 연구는 운전 수행 중에 실험적으로 유도된 시간압력과 운전자의 분노가 운전 수행에 어떠한 영향을 미치는지 운전시뮬레이션 방법을 통해 살펴보고자 수행되었다. 이를 위해 네 가지의 실험 조건(통제 조건, 시간압력 조건, 분노유도 조건, 그리고 시간압력과 분노유도가 혼합된 조건)에 따라 운전자들이 보이는 운전 수행의 여러 측면들(침선침범, 신호무시, 속도유지 실패 및 경로이탈)을 분석하여 비교하였다. 본 연구의 결과를 요약하면 다음과 같다. (1) 일반적으로, 아무런 스트레스가 주어지지 않았던 통제 조건에 비해 유도된 분노에 의한 스트레스나 시간압력과 분노가 혼합된 형태의 스트레스에 의해 실험참가자들의 차량 통제 수행이 저하되었으나, (2) 시간압력만 주어질 경우, 통제집단에 비해 속도유지 실패의 빈도는 더 많았으나 다른 종속치들에 대해서는 통제집단과 유의한 차이를 보이지 않았다. 그리고 (3) 분노만 유도된 조건과 분노와 시간압력이 모두 유도된 조건 사이에는 모든 종속측정치들에서 차이가 관찰되지 않았다. 본 연구 결과를 전체적으로 고려해 보면, 시간압력에 의한 스트레스와 유도된 분노에 의한 스트레스가 운전 수행에 차별적으로 영향을 미칠 수 있다는 것을 시사한다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 추계학술대회 논문집
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• pp.130-133
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• 2008

The formability of DP steels can be affected by not only initial texture but also deformation texture evolved during plastic deformation. To investigate the evolution of deformation texture during deep drawing, deep drawing process for DP steels was carried out experimentally. A rate sensitive polycrystal model was used to predict texture evolution during deep drawing process. In order to evaluate the strain path during deep drawing, a steady state was assumed in the flange part of deep drawn cup. A rate sensitive polycrystal model successfully predicted the texture development in DP steels during deep drawing process. It was found that the final stable orientations were strongly dependent on the initial location in the blank.

• 가정과삶의질연구
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• 제11권2호
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• pp.96-110
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• 1993

The purpose of this study also suggests the direction for the improvement of the quality of family life because the homemaker's health sate affects a successful home management and a satisfactory family life. This study is based on a review of relevent lifevatures by using a research model consits of the independent variables the mediating variables and the dependent variables. The samples were selected by cluster in Seoul Korea. The 700 questionaries were distributed to homemakers who have at least one child with their spouses. Finally the 520 data were analyzed by cronbach's coefficient factory analysis frequency percentage oneway ANOVA correlation regression analysis and path analysis. Consequentyly the findings of this study were accepted hypothesis I. II. III. IV.