• Journal of Digital Convergence
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• v.15 no.7
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• pp.65-80
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• 2017

The purpose of this study was to investigate the effects of job stress on organizational effectiveness and the moderating role of organizational commitment among social workers. For this study, date were collected from 236 social workers employed at social welfare institutions in the Metropolitan area with structured questionnaires and analyzed using hierarchical regression analysis technique. This study found that three job stress variables(role ambiguity, role conflict and workload) had negative effects on social workers' job satisfaction and organizational citizenship behavior, whereas they positively impacted on their intent to stay, and that organizational commitment buffered the deleterious effects on job stress on organizational effectiveness.

• Transactions of the Korean Society of Mechanical Engineers
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• v.5 no.3
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• pp.170-177
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• 1981

1,200.deg.C에서의 단조철은 점소성을 나타내며 인발과 압출시 변형영역이 구형수렴형태가 됨을 실험을 통하여 나타난다. 이 변형역 모델로부터 평형방정식을 사용하여 평균 압출 및 인발응력과 정수압을 계산해 낸다. 평균 압출 및 임발응력은 상계 해석 방법에 의한 결과와 비교하여 본 연구의 해석방법의 유효성을 타진하고 정수압은 다른 연구자들의 결과와 비교 검토되며 특히 냉간가공의 경우와 비교 검토 된다. 그 외에 마찰계수, 급형각도와 단면감소율의 영향에 대해서도 논의 된다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.81-84
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• 2002

최근, 사회의 요구의 다양성, 고도화에 동반하여 지도정보 시스템에 대한 수요가 증가하고 있다. 이 시스템을 구축할 때, 지도 중에서 각 선도형이 갖는 방대한 데이터를 어떻게 압축하여 시스템에 입력하여, 축적할까하는 것이 문제가 된다. 자동차의 네비게이션 등에 이용하는 도로지도에 한해서는, 도로의 접속관계만 유지된다면, 원래의 도로지도와 다소 차이가 있다고 하여도 충분히 유효하다. 본 연구에서는 이 네비게이션을 목적으로 한, 시가지의 도로망 지도에 대하여, 특징점 추출과 직선 근사를 이용한 데이터 압축법을 제안한다.

• 전기의세계
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• v.66 no.1
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• pp.32-37
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• 2017

본 고에서는 무선전력전송(WPT) 분야에 메타재질(Metamaterial)구조 기술이 어떻게 접목되고 있는지가 다뤄진다. 전기공학의 중요한 테마가 된 무선전력전송과, 주로 고주파 영역에서 등장하는 메타재질구조와는 괴리가 있다고 느껴질 수도 있으나, 근원이 전류이고 자기장에 의한 송수신 사이의 결합이라는 점에 기반을 두고 있다는 점에서 접목 가능성은 충분하다. 따라서, 자속과 유효 투자율 증가가 가능한 자기장형 메타재질구조에 의한 무선전력전송 시스템의 성능향상법을 국외 사례 및 필자의 WPT 과제수행 경험을 근간을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.461-464
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• 2019

2017년에 대표적인 프로세서 취약점인 Meltdown과 Spectre가 발표됨에 따라 Intel의 CPU에서 다양한 취약점이 노출되었다. 이 취약점은 하드웨어 기반으로 신뢰 할 수 있는 환경을 보장해주는 TEE(Trusted Execution Environment) 기술을 사용하는 Intel의 SGX(Software Guard Extensions)에서도 유효하다. 따라서 이러한 취약점을 이용하여 신뢰 할 수 있는 환경에서 데이터의 무결성 및 기밀성을 훼손하는 다양한 공격 연구가 활발히 이루어지고 있다. 본 논문에서는 Intel SGX의 다양한 공격 연구에 대한 최신 동향을 살펴보며, 이에 따른 향후 연구 전망을 제시하고자 한다.

• Tribology and Lubricants
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• v.30 no.1
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• pp.15-20
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• 2014

A more accurate expression for effective viscosity is obtained using a linear regression of the data from Fukui-Kaneko's model, which are obtained through numerical calculations based on the linearized Boltzmann equation. Veijola and Turowski's expression is adopted as a base function for effective viscosity. The four coefficients in that equation are optimized, and sensitivity analysis is conducted for these coefficients. The results show that the coefficient for the first-order Knudsen number is the most accurate, whereas the coefficient in the exponential of the Knudsen number is the least accurate compared with Fukui-Kaneko's results. The expression for effective viscosity is accurate within 0.02% rms of Fukui-Kaneko's results for the inverse Knudsen numbers from 0.01 to 100 and surface accommodation coefficients ranging from 0.7 to 1.

• The Journal of the Korea Contents Association
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• v.18 no.4
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• pp.138-153
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• 2018

In the recent years, coaching leadership has been in the spotlight as being an essential human resources management strategy for improving organizational effectiveness in addition to strengthening the capacity of organizational members. Therefore, this study empirical analyses the effect of sales coaching on motivation and organizational effectiveness and the moderating effect of achievement needs. As a result, First, sales manager coaching appeared to have positive effect on the motivation and organizational effectiveness (job satisfaction, organizational commitment, job performance). Second, motivation appeared to have positive effect on organizational effectiveness. Third, achievement need appeared to have moderating effect in the relationship between sales manager coaching and organizational commitment. According to the study results, sales managers' coaching has positive effects on improving salespeople's performance as well as their levels of motivation, job satisfaction, and organizational commitment. In addition, this study proves that depending on the level of salespeople's need for achievement, the purpose and approach of coaching styles must be different to maximize the positive effects. This empirical study contributes to the theoretical as well as practical improvements of leadership coaching by verifying the conditional attributes for implementing effective sales managers' coaching for improving organizational effectiveness.

• 한국벤처창업학회:학술대회논문집
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• 2006.11a
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• pp.415-443
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• 2006

This empirical study focused on examining the relationship between transactional transformational leadership style and power of construction project manager and the organizational effectiveness, respectively, and the moderating role of power between leadership and the organizational effectiveness. A 790 numbers useful questionnaires were obtained from the stuffs working at the construction sites excluding project managers. Internal consistency test using Cronbach's ${\alpha}$ and confirmatory factor analysis were conducted for the reliability and validity of the scales respectively. And cluster analysis and multivariate analysis of variance (MANOVA) were conducted to test the hypotheses. The results and implications are as follows. First, the leadership styles of project managers influence positively the subordinates' job satisfaction but not organizational commitment in construction project. Second, the power styles of project managers influence positively the subordinates' job satisfaction and organizational commitment. Third, the leadership styles of the project managers influence positively the subordinates' job satisfaction and organizational commitment by the power moderating role. The implication of this result is important because of the fact that the transformational leadership can be useful even in the construction projects. And the moderating role of the project manage's power suggests.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.2
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• pp.224-231
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• 2011

Heating and/or cooling of the channel with pin-fin structure is a promising choice for the efficient heat transfer. Complex pin-fin structure shows highly irregular behavior like porous media. This study shows the numerical analysis on the characteristic of heat transfer and pressure drop of a channel with pin-fin structure. It predicts the experimental data quite well at the high porosity region with large diameter. Low porosity activates the rigorous flow disturbance and, consequently, the enhanced heat transfer. However, the concept of optimum design should be carefully reviewed because the pressure drop is also increased with decreasing porosity at low porosity region.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.163-166
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• 2005

The latest wireless communications technology bring about the rapid developments of Global Position System and Location-Based Service. It is very important for the moving object database to deal with database queries related to the trajectories of a moving objects and the valid time of the query results as well. In this paper, we propose how to get not only the current result of query but also the valid time and the result after the time when a query point and objects are moving at the same time. We would like to predict the valid time by formula because the current results will be incorrect due to the characteristic of the continuous movements of the moving objects and the future results can not be calculated by iterative computations.