• 한국심리학회지 : 문화 및 사회문제
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• 제19권4호
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• pp.553-576
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• 2013

본 연구의 목적은 은퇴 남성의 은퇴스트레스, 성격 강점, 결혼불만족이 우울에 영향을 미치는지 살펴보고, 성격 강점과 결혼불만족의 직접효과 및 간접효과를 검증하는 것이다. 이를 통해 은퇴스트레스가 우울감을 유발하는데 있어서 개인의 긍정적 성격특성과 결혼만족이라는 긍정적인 관계특성이 완충적 역할을 하는지 포괄적으로 살펴볼 수 있을 것이다. 본 연구를 위해 대구·경북 지역에 거주하는 은퇴 남성 197명에게 은퇴스트레스 척도(RSS), 성격 강점 검사(CST), 한국판 결혼만족도 검사(K-MSI), 한국판 역학연구센터 우울척도(CES-D)를 실시하였다. 중다회귀분석과 AMOS를 이용한 구조방정식 결과는 다음과 같다. 첫째, 은퇴남성의 은퇴스트레스가 높을수록 은퇴 남성의 우울이 높은 것으로 나타났다. 둘째, 은퇴 남성의 성격 강점 중 낙관성이 부족할수록 그리고 심미안이 높을수록 높은 우울 수준을 예견하였다. 또한 은퇴 남성의 결혼불만족이 높을수록 우울경향이 높은 것으로 나타났다. 셋째, 은퇴스트레스와 우울의 관계에서 성격강점과 결혼불만족의 직접경로와 간접경로 모두를 포함하는 연구모형은 대안모형보다 더욱 좋은 적합도를 보였다. 즉, 성격 강점과 원만한 부부관계가 은퇴 이후 경험하는 남성들의 우울에 완충 작용을 하는 것으로 나타났다. 이러한 결과는 은퇴 남성의 심리적 안녕을 위한 프로그램의 기초자료로 활용될 수 있을 것이다. 마지막으로 본 연구의 제한점과 후속연구에 대한 제언을 논의하였다.

• 가족자원경영과 정책
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• 제27권4호
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• pp.19-33
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• 2023

본 연구는 중국 유학생의 가족건강성이 SNS 중독경향성에 미치는 영향에서 자아탄력성의 매개효과를 살펴보고자 하였다. 이를 위해 한국에 재학 중인 중국 유학생 349명을 대상으로 설문조사를 진행하였고 수집된 자료는 SPSS Statistics version 28 프로그램과 SPSS Process Macro 4.3으로 분석하였다. 주요 연구결과는 다음과 같다. 첫째, 중국 유학생의 SNS 중독경향성, 가족건강성, 자아탄력성을 살펴보면 중간보다 높은 수준으로 나타났다. 둘째, 중국 유학생의 SNS 중독경향성은 SNS 하루 평균 이용 시간은 정적 상관관계를, 가족건강성과 자아탄력성과는 부적 상관관계를 나타냈다. 셋째, 위계적 회귀분석 결과, 성별, 가족과의 연락 빈도, SNS 하루 평균 이용 시간, 가족건강성 중 질적 유대감, 자아탄력성 중 통제성이 유학생들의 SNS 중독경향성에 영향을 미치는 것으로 나타났다. 넷째, 가족건강성이 SNS 중독경향성에 미치는 영향에서 자아탄력성이 완전 매개효과가 있었다. 본 연구는 중국 유학생의 SNS 중독경향성을 예방하는 변인으로 가족건강성과 자아탄력성을 밝혔으며, 이를 통해 중국 유학생의 SNS 중독경향성을 예방하기 위해 상담 개입의 방향성을 제시하였다.

• 한국농공학회지
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• 제30권3호
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• pp.106-113
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• 1988

This study was performed to obtain the basic data which can be applied to use of foamihg mortars. 1. At the mixing ratio 1:1, the highest strengths were showed by foaming mortam, respec - tively. But, it. gradually was decreased in poorer mixing ratio and more addition of foam- ing agent. The decreasing rates of strengths were incresed in poorer mixing ratio and more addition of foaming agent. 2. The strengths were decreased up to 77.0-92.8% by mix-foaming type and 36.7-74.4% by pre-foamed type than cement mortar. 3. At the mixing ratio of 1:1, the lowest air contents were showed by foaming mortars, respectively. But, it gradually was increased in poorer mixing ratio and more addition of foaming agent. The increasing rates of air contents were increased in richer mixing ratio and more addition of foaming agent. 4. Air contents were showed up to 26.0-63.8 times by mix-foaming type and 5.8-17.7 times by pre-foamed type than cement mortar, respectively. 5. The correlations between compressive strength and air content were highly significant, respectively. The multiple regression equations of strengths and air content were computed depending on a fuction of mixing ratio and addition of foarning agent. It was highly significant, respectively.

• Computers and Concrete
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• 제20권2호
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• pp.247-255
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• 2017

This study aimed to develop a Rule Based Mamdani Type Fuzzy Logic (RBMFL) model to predict the flexural strengths and compressive strengths of blended cements under elevated temperatures. Clinoptilolite was used as cement substitution material in the experimental stage. Substitution ratios in the cement mortar mix designs were selected as 0% (reference), 5%, 10%, 15% and 20%. The data used in the modeling process were obtained experimentally, after mortar specimens having reached the age of 90 days and exposed to $300^{\circ}C$, $400^{\circ}C$, $500^{\circ}C$ temperatures for 3 hours. In the RBMFL model, temperature ($C^{\circ}$) and substitution ratio of clinoptilolite (%) were inputs while the compressive strengths and flexural strengths of mortars were outputs. Results were compared by using some statistical methods. Statistical comparison results showed that rule based Mamdani type fuzzy logic can be an alternative approach for the evaluation of the mechanical properties of concrete under elevated temperature.

• 대한치과보철학회지
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• 제29권3호
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• pp.101-110
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• 1991

The purpose of this study was to compare the repaired joint strength among several edge profiles after denture repair. For this study, eight edge profiles were used for repair methods and five self-curing resin brands were used for repair materials. Break away loads were tested after 1 hr., 24 hrs. and 1 week. Instron was used for testing the transverse strength of repaired specimen. The results were as follows. 1. Repaired joint strength was about 35-65% of that of original specimen. 2. Joint strengths of round, inverse knife, inverse rabbit, lap ogee joint were higher tnan that of traditional simple butt joint 3. Joint strength of the simple butt joint was low significant. 4. Joint strengths after 1 hr. specimen were lower than those of 24 hrs. and 1 week specimens in joint strengths. 5. There were no significant differences between 24 hrs. and 1 week specimens in joint strengths. 6. It look more than 24 hours to gain satisfactory physical property after repairing the fractured denture base when self-curing resin was used for repair.

• 대한인간공학회지
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• 제29권5호
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• pp.715-725
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• 2010

Many researches for grip strengths, using diverse ways such as subject, equipment, posture, method, has been conducted to investigate the differences of grip performance of dominant hand and non-dominant hand. It is hard to conclude, however, with one single or simple answer for this question based on researches due to various findings. Although 'the 10% rule' which is the dominant hand may produces a 10% greater grip strength than the non-dominant hand was often mentioned for this issue, there is still lack of supports for utilizing to general cases. This manuscript provides an overall review on the 53 research papers which were measured grip strengths of dominant as well as non-dominant hand in various conditions. According to this review study, many research findings reported that overall the grip strength differences between dominant and non-dominant hands were 6~10%, regardless of gender and age, followed by 0~5%, 11~15%, and over 16%. More detail information for grip strengths in both hands for gender and age groups were also presented in this study.

• 정보처리학회논문지C
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• 제13C권5호
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• pp.635-640
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• 2006

유무선 혼합망에서 BS(Base Station : 기지국)에 Snoop을 이용한 지역 재전송기법은 무선망에서 패킷이 손실되면 빠른 복구를 가능하게 하지만 MH(Mobile Host:이동호스트)가 수신범위를 벗어나면서 생긴 패킷 손실 시에는 오히려 성능 저하의 원인이 될 수 있다. 따라서 본 논문에서는 MH가 수신범위를 벗어나면서 생기는 패킷 손실과 그로 인한 지역 재전송을 최소화하기 위해 MH의 ACK 패킷에 RSS(Received Signal Strengths:수신신호세기)를 나타내는 flag bit추가를 제안한다. BS는 RSS flag bit를 이용해서 패킷 전송여부를 결정함으로써 패킷 손실을 최소화하는 것이다. 시뮬레이션 결과 기존의 Snoop에 비해 TCP 성능이 향상됨을 확인할 수 있었다.

• Structural Engineering and Mechanics
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• 제68권3호
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• pp.289-297
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• 2018

The real behavior of the RC structures constructed based on the assumed specifications of the used materials is matched with the designed ones when the assumed and the applied specifications in construction are the same. Despite in the construction phase of the reinforced concrete (RC) structures always it is tried to implement the same specifications of materials as given in the executive drawings, but considering the unpredicted/uncontrolled parameters that affect the specification of materials, always there is a deviation between the constructed and the designed materials' specifications. The objective of this paper is to submit a guideline for the evaluation of the strength and damage to the existing RC structures encountered deviation in materials' strengths. To achieve this goal, the lateral strength (plastic behaviors) and damage to twenty-five RC moment-resisting frames (MRFs) are studied by applying the inelastic analysis. In this study, a couple of concrete and reinforcement strengths' deviations are investigated. The obtained results indicate that in general, there is a semi-linear relationship between the deviation in the strength of reinforcement and the changes in the lateral strength values of the MRFs. The relative effect of the deviation in the strength of reinforcements is more than the relative effect of the deviation in the concrete strength on the damage rate. The obtained results could be a guideline for the engineers in the survey of the existing buildings encountered deviation in materials' strengths during their construction phase.

• Computers and Concrete
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• 제25권1호
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• pp.83-94
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• 2020

The use of fly ash in modern-day concrete technology aiming sustainable constructions is on rapid rise. Fly ash, a spinoff from coal calcined thermal power plants with pozzolanic properties is used for cement replacement in concrete. Fly ash concrete is cost effective, which modifies and improves the fresh and hardened properties of concrete and additionally addresses the disposal and storage issues of fly ash. Soft computing techniques have gained attention in the civil engineering field which addresses the drawbacks of classical experimental and computational methods of determining the concrete compressive strength with varying percentages of fly ash. In this study, models based on soft computing techniques employed for the prediction of the compressive strengths of fly ash concrete are collected from literature. They are classified in a categorical way of concrete strengths such as control concrete, high strength concrete, high performance concrete, self-compacting concrete, and other concretes pertaining to the soft computing techniques usage. The performance of models in terms of statistical measures such as mean square error, root mean square error, coefficient of correlation, etc. has shown that soft computing techniques have potential applications for predicting the fly ash concrete compressive strengths.

• 한국응용과학기술학회지
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• 제30권4호
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• pp.672-678
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• 2013

Although the basalt fiber has superior fire-resistance and chemical resistance, it has many disadvantages in its applications. Generally, the tensile and loop strengths of basalt fiber were decreased with generated frictional heat during industial appplications. To solve this problem, polytetrafluoroethylene (PTFE) coating system was introduced and a sutable coating condition was evaluated. The basalt fiber was pre-treated with triethoxytrifluoropropylsilane (TMTFPS) at various pHs and then coated with PTFE dispersions with penetrating agent sodium bis(2-ethylhexyl)sulfo succinate (DOS-Na) to increase the tensile and loop strengths as well as to reduce the fibril during working. A universial testing machine (Instron Model 3366) was used to measure tensile and loop strengths. When the PTFE dispersion with 0.25 wt% of DOS-Na was coated on the surface of basalt fiber after pre-treating with 5 wt% of PTFE, the highest tensile and loop strengths were reached to 3.5 gf/D and 2.4 gf/D, respectively.