• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.661-664
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• 2008

고층 대형 건축물에 사용되는 기둥 보 등의 단면치수가 큰 Precast Concrete 부재는 제조과정에 있어서 외부에서의 가열뿐만 아니라, 시멘트수화열의 축척에 의한 내부에서의 온도 상승도 작용되기 때문에, 단면치수가 비교적 작은 벽, 밑바닥 등의 Precast Concrete 부재와는 다른 온도이력을 나타낸다고 생각할 수 있다. 이에 본 연구는 Precast Concrete적용을 위한 고강도 매스콘크리트 부재의 강도특성을 검토하기에 앞서, 온도이력특성을 밝히는 것을 목적으로 했다. 단면치수가 큰 Precast Concrete 모의부재의 단면치수, 단위시멘트량, 양생조건이 가각 다른 Precast Concrete 부재를 제조할 때의 온도이력특성을 총괄적으로 검토하여 분석하였다.

• 한국프랜차이즈경영연구
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• 제7권2호
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• pp.37-45
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• 2016

Purpose - This study aims to examine the impact of leadership on organizational trust and innovation performance, and to identify whether organizational trust plays a mediating role in the relationship between leadership and innovation performance. Also, this study attempts to find out how to improve organizational efficiency and effectiveness based on leadership-based or trust-based strategies. And, this research proposed that organizational trust plays a core mediating role in the relationship between transactional and transformational leadership and innovation performance. Research design, data, and methodology - In order to test the hypotheses of this study, the survey was conducted towards franchise coffee shop employees between November 7 and 18, 2016. We contacted top executives of coffee shop franchise headquarters and explained the purpose of this study. Among 150 questionnaires distributed, 123 were collected. Of these collected questionnaires, 102 questionnaires were coded and analyzed for further analysis. In order to test the unidimensionality and reliability of the factors, factor analysis and reliability test were performed using SPSS/PC+ 22.0. And, the hypotheses were tested using hierarchical mediated regression analysis. Result - The results are as follows. First, transactional leadership, and intellectual stimulation, motivation of transformational leadership had significant impacts on organizational trust. Second, organizational trust, transactional leadership, and influence of transformational leadership had significant impacts on innovation performance. Third, the mediating test of organizational trust showed that transactional leadership plays a partial mediator, and intellectual of transformational leadership plays a full mediator in the relationship between leadership and innovation performance. Conclusions - The implications of this study are as follows. First, the top management should provide their organizational members incentives or rewards based on their performance. Second, top management should identify and express a clear vision and desirable organizational goals for the future, present an idealized vision, and communicate to organizational members that the vision is achievable, also have organizational members to think creatively and find optimal solutions to difficult problems. In sum, this study revealed the important role of leadership in embedding organizational trust in and improving innovation performance of coffee shop employees and the mediating role of organizational trust in the influence of leadership on innovation performance.

• 콘크리트학회논문집
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• 제26권2호
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• pp.189-199
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• 2014

최근 들어, 압축강도가 서로 다른 프리캐스트 콘크리트와 현장타설 콘크리트의 합성 부재의 사용이 증가하고 있지만 현행 콘크리트 구조기준에는 서로 다른 강도로 복합화된 부재의 수직 전단강도에 대해 검증되지 않은 다양한 계산법들이 제시되어있다. 그래서 이번 연구에서는 기존에 연구되었던 무횡보강 합성보와 같은 철근비와 전단경간비를 갖는 횡보강 합성보의 전단강도 실험을 통해 횡보강 합성 부재의 전단강도에 대해 알아보았다. 변수로는 단면형상, 전단철근 간격, 그리고 전단경간비(a/d)를 고려하였다. 실험 결과와 현행 기준에서 제시하는 합성 부재의 수직전단강도 기준식을 비교하였다. 실험 결과를 분석해보면 횡보강 부재의 수직전단강도는 유효콘크리트 강도와 압축대 콘크리트 강도에 영향을 받았고 휨 균열 강성에 비례하였고 압축대 콘크리트 강도에 따라 전단철근의 기여도의 차이를 보였다.

• 인터넷정보학회논문지
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• 제3권4호
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• pp.11-18
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• 2002

기존의 멀티캐스트 프로토콜은 서비스 수신자가 주체가 되어 그룹에 가입/탈퇴하는 방법을 사용하고 있어 서비스 제공자가 그룹 멤버에 대해 데이터전송의 신뢰성을 관리하기 힘든 구조로 되어 있다. 본 논문은 교육 시스템과 같이 서비스제공자(서버) 중심의 멀티미디어 데이터 통신이 이루어지는 시스템을 위해서 서비스 제공자 중심의 그룹 관리와 통신의 신뢰성을 제공하는 멀티캐스트 미들웨어를 설계 구현한다. 개발된 미들웨어는 다수의 멀티캐스트 그룹에 대해 그룹멤버의 상태정보를 관리하는 그룹관리기, 신뢰성을 보장하는 NAK기반의 통신프로토콜에 의한 송수신기로 구성되어 있다. 이를 이용해 22khz 음성데이터와 1024＊768 24bit color image 데이터를 동시에 30대의 pc에 송신한 결과 음성은 동시에 2명의 음성이 전원에게 손실없이 전송되고 image는 0.004%,정도의 낮은 재전송율로 초당 2장의 image가 전송된다.

• Steel and Composite Structures
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• 제18권6호
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• pp.1391-1404
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• 2015

A radially retractable roof structure based on the concept of the hybrid grid shell is proposed in this paper. The single-layer steel trusses of the radially foldable bar structure are diagonally stiffened by cables, which leads to a single-layer lattice shell with triangular mesh. Then comparison between the static behavior between the retractable hybrid grid shell and the corresponding foldable bar shell with quadrangular mesh is discussed. Moreover, the effects of different structural parameters, such as the rise-to-span ratio, the bar cross section area and the pre-stress of the cables, on the structural behaviors are investigated. The results show that prestressed cables can strengthen the foldable bar shell with quadrangular mesh. Higher structural stiffness is anticipated by introducing cables into the hybrid system. When the rise-span ratio is equal to 0.2, where the joint displacement reaches the minimal value, the structure shape of the hyrbid grid shell approaches the reasonable arch axis. The increase of the section of steel bars contributes a lot to the integrity stiffness of the structure. Increasing cable sections would enhance the structure stiffness, but it contributes little to axial forces in structural members. And the level of cable prestress has slight influence on the joint displacements and member forces.

• 한국공간구조학회논문집
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• 제23권2호
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• pp.37-44
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• 2023

In the case of a school building, even though it is a regular structure in terms of plan shape, if the masonry infill wall acts as a lateral load resisting element, it can be determined as a torsionally irregular building. As a result, the strength and ductility of the structure are reduced, which may cause additional earthquake damage to the structure. Therefore, in this study, a structure similar to a school building with torsional irregularity was selected as an example structure and the damping performance of the PC-BRB was analyzed by adjusting the eccentricity according to the amount of masonry infilled wall. As a result of nonlinear dynamic analysis after seismic reinforcement, the torsional irregularity of each floor was reduced compared to before reinforcement, and the beams and column members of the collapse level satisfied the performance level due to the reduction of shear force and the reinforcement of stiffness. The energy dissipation of PC-BRB was similar in the REC-10 ~ REC-20 analytical models with an eccentricity of 20% or less. REC-25 with an eccentricity of 25% was the largest, and it is judged that it is effective to combine and apply PC-BRB when it has an eccentricity of 25% or more to control the torsional behavior.

• 한국지진공학회논문집
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• 제27권3호
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• pp.129-137
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• 2023

This study presents a dry precast concrete (PC) beam-column connection, and its target seismic performance level is set to be emulative to the reinforced concrete (RC) intermediate moment resisting frame system specified in ACI 318 and ASCE 7. The key features include self-sustaining ability during construction with the dry mechanical splicing method, enabling emulative connection performances and better constructability. Test specimens with code-compliant seismic details were fabricated and tested under reversed cyclic loading, which included a PC beam-column connection specimen with dry connections and an RC control specimen. The test results showed that all the specimens failed in a similar failure mode due to plastic deformations in beam members, while the hysteretic response curve of the PC specimen showed comparable and emulative performances compared to the RC specimen. Seismic performance evaluation was quantitatively addressed, and on this basis, it confirmed that the presented system can fully satisfy all the required performance for the intermediate RC moment resisting frame.

• Child Health Nursing Research
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• 제6권2호
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• pp.249-261
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• 2000

The purpose of this study were to identify the quality of life for the mothers of hospitalized chronic pediatric patients, and to explore the factors affecting the QOL of those mothers. The subjects were 201 mothers whose children had hospitalized at one University hospital with chronic diseases. Data were collected from the December, 1997 to December, 1998. We used a revised QOL instrument consisting of 34 items, 5 point likert scale based on the Noh's QOL instrument. The revised QOL consists of six subscales, those are physical status and function, self esteem, emotional status, economic status, relationship with family members, and relationship with neighborhood. Data were analyzed by t-test, ANOVA, Pearson's correlation using SPSS-PC. The results were as follows: 1. The mean score of quality of life for the mothers of chronic pediatric patients was 100.31, and item mean was 2.95. In subscale analysis, item mean of economic status was the lowest, and that of relationship with family members was the highest. 2. Correlations between characteristics of chronic pediatric patients, their mothers and QOL of mothers were as follows; 1) Total QOL of mothers had a significant positive relationship with progressing time relapse after diagnosing and age of mothers. There was a significant negative relationship between the total QOL of mothers and number of hospitalization of their children. 2) QOL on self esteem and economic status had a significant relationship with age of pediatric patients, the time relapse after diagnosis, and age of mothers. Total number of family members and QOL on economic status showed a significant positive relationship. QOL on emotional status, economic status, and relationship with family members of mothers showed negative correlations with the number of hospitalization of their children. 3. Followings were the result of difference in QOL among different demographic cha- racteristics of the subjects. 1) QOL on economic status of mothers was significantly higher when fathers of pediatric patients had jobs. 2) Total QOL score, QOL on emotional status, and QOL on relationship with neighborhood were significantly higher when mothers of pediatric patients had spouses. 3) QOL on self esteem of mothers was significantly higher when mothers had religion. 4. Followings were the result of difference in QOL among different diagnosis of the children. 1) Total QOL score of mothers whose children had congenital heart disease was higher than that of mothers whose children had leukemia and cancer. 2) QOL on emotional status, economic status, and relationship with family members of mothers whose children had congenital heart disease were higher than those of mothers whose children had leukemia, cancer, and epilepsy.

• 기본간호학회지
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• 제3권2호
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• pp.153-169
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• 1996

This study was designed to identify, describe and classify orientations of cancer patient's family members to death and to identify factors related to their attitudes on death. Death to the male is understood as a comprehensive system and believed to be highly subjective experience. Therefore attitude on death is affected by personalities. As an attempt to measure the subjective meaning toward death, the unstructured Q-methodology was used. Korean Death Orientation Questonaire prepared by Kim was used. Item-reliability and Sorting-reliability were tested. Forty five cancer patients' family members hospitalized in one university medical center in Seoul were sampled. Sorting the 65 Q-itmes according to the level of personal agreement ; A forced normal distribution into the 11 levels, were carried out by the 45 P-samples. The demographic data and information related to death orientation of the P-sample was collected through face to face in depth interviews. Data was gathered from August 30 till September 22, 1995. The Z-scores of the Q-items were computed and principal component factor analysis was carried out by PC-QUANL Program. Three unique types of the death orientation were identified and labeled. Type I consists of twenty P-samples. Life and death was accepted as people's destiny, They firmly believed the existence of life after life. They kept aloof from death and their concern was facing the and of the life with dignity, They were in favor of organ donation. Type II consists of Nine P-Samples. They considered that death was the end of everything and did not believed the life after life. They were very concerned about the present life. Type III consists of Sixteen P-samples. They regarded the death as a natural phenomena. And they considered that the man is just a traveller and is bound to head for the next life which is believed to be free of agony, pain or darkness. They neither feared death nor its process. Their conserns were on the activities to prepare themselves for the eternal-life after death. Thus, it was concluded that there were three distinctiven type of attitudes on death among cancer patient family members, and their death attitudes were affected by demographic and socio-cultural factors such as sex, education, and religion.

• 간호행정학회지
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• 제10권2호
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• pp.265-276
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• 2004

Purpose: This study was to define structural subjectivity pattern of whistle-blowing of hospital nurses. Method: This study was conducted using Q-methodology in order to classify the types of perception to an whistle-blowing from the inside of the incumbent hospital nurses. Nineteen members, including hospital nurses, professors and students majoring in the nursing department made 47 statements about the insider's accusation after an in-depth interview about the statements. Forty incumbent hospital nurses were the participants for the Q-Methodology. The statement data was analyzed with QUANL PC Program and five different types were classified according to how the nurse had replied to the statements. Result: The first one is a Propeller type. The second one is a Denial type. The third type is a Patient Advocate type. The fourth one is a Anonymous type. The fifth is a Netizen type. Conclusion: this study as a momentum, a reasonable and constitutional legislation in the nurses organization should be established as soon as possible.