• 대한기계학회논문집A
• /
• 제20권9호
• /
• pp.2792-2799
• /
• 1996

It was shown in the previous study that the numerically derived elastic work factor for CLS specimen was independent of fiber direction for a unidirectional case. Also, it was proposed the elastic work factor could be used to determine energy release rate from a single test record. In the present study, elastic work factor was derived from a simple beam theory to investigate its dependence on material property and geometric condition. Also, the elastic work factor of CLS specimen was applied experimentally to determine critical energy release rate in order to prove its validity determining critical energy release rate from a single specimen. For this purpose, critical energy release rate determined using the elastic work factor was compared with that determined by the compliance method. The results showed that while elastic work factor is affected by $t_2/t_1$ and $L_2/L_1$ it is independent of fiber angle for a unidirectional case. It was also found that critical energy release rates determined by both methods are comparable each other, thus elastic work factor approach can be used to determine energy release rate from a single test specimen.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2003년도 춘계학술대회 논문집
• /
• pp.1390-1393
• /
• 2003

Work factor approach is conveniently used in metal fracture mechanics to determine fracture toughness from a single fracture test. In this work, we investigated the applicability of the work factor approach in order to determine fracture toughness of thick graphite/epoxy composites in the hydrostatic pressure environment from a single fracture test. The effect of hydrostatic pressure on the elastic work factor was studied, The stacking sequence used was multi-directional, [0$^{\circ}$/${\pm}$45$^{\circ}$/90$^{\circ}$]. The hydrostatic pressures applied were 0.1 MPa, 100 MPa, 200 MPa, and 300 MPa. The results showed that the elastic work factor was not affected by the hydrostatic pressure, The elastic work factor decreased in a linear fashion with crack length.

• 대한기계학회논문집A
• /
• 제20권11호
• /
• pp.3491-3497
• /
• 1996

The work factor approach was applied to determine $G_ {IC}$ of fiber reinforced composites (AS4/3501) from a single unidirectional (0-deg) DCB specimen. Elastic work factors of DCB specimen for three different symmetrical staking sequences were derived from a simple bending theory and a finite element method. The results showed that elastic work factors calculated from both methods were comparable each other. In particular, the elastic work factor of DCB specimen with symmetrical stacking sequence is independent of stacking sequence. The $G_ {IC}$ determined from the work factor approach was compared with that determined by the compliance method. The results showed that the work factor approach and the compliance method produce comparable results of $G_ {IC}$. Thus, $G_ {IC}$ can be determined from a single DCB specimen using the work factor approach.

• 한국복합재료학회:학술대회논문집
• /
• 한국복합재료학회 2001년도 춘계학술발표대회 논문집
• /
• pp.46-49
• /
• 2001

In this paper. tile validity of work factor approach was investigated to determine compressive fracture toughness of unidirectional graphite/epoxy composites under hydrostatic pressure environment. The elastic work factor was determined under various pressures as a function of delamination length. It was found that elastic work factor was not affected by hydrostatic pressure.

• 한국문헌정보학회지
• /
• 제47권3호
• /
• pp.181-205
• /
• 2013

이 연구는 대학도서관 사서들이 업무수행 과정에서 받고 있는 직무스트레스를 보다 정확하게 측정할 수 있는 척도를 개발하고자, 실증연구를 통하여 기존의 국내 외 대표적 직무스트레스 척도를 분석하여 종합하고, 질적 연구방법 중 심층면접법을 도입하여 대학도서관 사서가 가지고 있는 특징적인 스트레스 요인을 추적하였다. 또한 두 척도를 종합한 직무스트레스 척도의 신뢰도와 타당도에 대한 분석을 실행하였다. 그 결과 '동료관계 갈등요인', '상하관계 갈등요인', '업무보상 평가요인', '감정노동 요인', '물리적 환경요인', '고용안정성', '심리적 직무요구요인', '의사결정 및 책임요인', '업무복잡성 요인', '업무경계 갈등요인', 그리고 '신체적 직무요구요인' 등 11개 요인, 46개 문항으로 구성된 사서를 위한 직무스트레스 척도가 개발되었다.

• 대한기계학회논문집A
• /
• 제22권3호
• /
• pp.540-544
• /
• 1998

Compliance calibration method is frequently used to determine $G_IC$ from the DCB composite specimen. However, the method requires at least 4 to 5 fracture test (loading-unloading) records. In this study, $G_IC$ of unidirectional graphite/epoxy DCB composites was determined from the elastic work factor approach which uses a single fracture test record. In order to inspect the validity of the elastic work factor approach, $G_IC$ determined from the elastic work factor approach was compared to that of determined from the compliance calibration method. It was shown that $G_IC$ determined from the elastic work factor approach was comparable to that determined from the compliance calibration method. That is, the elastic work factor approach can be used to determine $G_IC$ of unidirectional graphite/epoxy DCB specimen from a single fracture record.

• 한국사회복지학
• /
• 제66권1호
• /
• pp.277-306
• /
• 2014

본 연구는 사회복지 가치에 관한 연구를 활성화하기 위하여 한국적 사회복지 실천 상황을 고려한 사회복지 가치 척도 개발을 목적으로 하였다. 국내외 관련 문헌 및 기존 척도를 검토하여 핵심가치를 도출하고, 현장 전문가들의 의견을 수렴하여 62개의 예비문항을 개발하였다. 예비문항은 다양한 사회복지기관에 근무하는 521명의 사회복지사를 대상으로 평가하였다. 탐색적 요인분석 및 확인적 요인분석을 통해 최종적으로 33개 문항으로 구성한 사회복지 가치 척도를 개발하였으며 이들 문항은 '자율성', '평등', '온정적 개입' 등 세 가지 사회복지 핵심가치를 측정한다. 척도의 신뢰도는 양호하였고, 한국어판 Professional Opinion Scale(POS)과 양(+)의 상관관계를 보여 수렴타당도가 입증되었다.

• 한국식품조리과학회지
• /
• 제22권2호
• /
• pp.131-139
• /
• 2006

This study investigated the effect of a coaching system(CS) on the employee's job satisfaction(JS) between the food service industry conducting and not conducting CS. A total of 342 employees were enrolled and the results were as follow. Firstly, relationship and willingness factors directly affected JS. Indirectly, work and relationship factors affected JS through the willingness factors. Secondly, when JS was compared at the service company conducting CS with that not conducting CS, work and relationship factors directly affected JS in the industry conducting CS, but only the relationship factor indirectly affected JS in the company not conducting CS. In addition, at the food service industry conducting CS, work factor affected willingness and competence factors, and therefore JS was affected indirectly, but relationship factor did not affect the willingness and competence factors. However, in the company not conducting CS, willingness only affected JS indirectly. Work factors directly affected JS, but through competence and willingness factors, work factor indirectly affected JS in the industry conducting CS. In the company not conducting CS, the relationship factor between employees affected the JS. In summary, CS increased JS through its direct effect on the work factor and indirect effect on the willingness and competence factors. Studies about CS are insufficient and CS remains in the introductory stage now, so further studies are necessary.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2013년 추계학술대회
• /
• pp.231-241
• /
• 2013

In recent years, accident induced by human error is increasing in the chemical plant. Human error analysis of the chemical plant was conducted on the basis of past accident. Some company called by A for the basis of a chemical accident. Factor analysis of human errors was separated in plant operation and work. Agency's work of occupational safety & health was classified into four types. It is based on the work before, during work, recovery work, and discontinue work. It was still separated work of human error by analysis and then was derived factor and issue. The human error factor and priority for accident prevention in the chemical plant is presented.

• 한국건축시공학회지
• /
• 제9권2호
• /
• pp.55-61
• /
• 2009

In order to conduct construction projects effectively, the work delay factors would be managed by planned construction schedules. As construction works are delayed ceaselessly, the solution is to select and manage the key factors which delay the work ceaselessly. The subjects of this study were an apartment houses of reinforced concrete structure. Hidden work delay factor were extracted, the surveys were conducted and occurrence, severity and detection of each factor were analyzed. With this result, final orders of priority were fixed and key management factors were deducted and presented.