• 한국군사과학기술학회지
• /
• 제26권2호
• /
• pp.179-187
• /
• 2023

APT cyber attacks have been a problem for over a past decade, but still remain a challenge today as attackers use more sophisticated techniques and the number of objects to be protected increases. 'Cyberattack Tracing System' allows analysts to find undetected attack codes that penetrated and hid in enterprises, and to investigate their lateral movement propagation activities. The enterprise is characterized by multiple networks and mass hosts (PCs/servers). This paper presents a data processing procedure that collects event data, generates a temporally and spatially extended provenance graph and cyberattack tracing paths. In each data process procedure phases, system design considerations are suggested. With reflecting the data processing procedure and the characteristics of enterprise environment, an operational architecture for CyberAttack Tracing System is presented. The operational architecture will be lead to the detailed design of the system.

• Smart Structures and Systems
• /
• 제19권1호
• /
• pp.39-46
• /
• 2017

Finite element model updating is very effective procedure to determine the uncertainty parameters in structural model and minimize the differences between experimentally and numerically identified dynamic characteristics. This procedure can be practiced with manual and automatic model updating procedures. The manual model updating involves manual changes of geometry and analyses parameters by trial and error, guided by engineering judgement. Besides, the automated updating is performed by constructing a series of loops based on optimization procedures. This paper addresses the ambient vibration based finite element model updating of long span reinforced concrete highway bridges using manual model updating procedure. Birecik Highway Bridge located on the $81^{st}km$ of Şanliurfa-Gaziantep state highway over Firat River in Turkey is selected as a case study. The structural carrier system of the bridge consists of two main parts: Arch and Beam Compartments. In this part of the paper, the arch compartment is investigated. Three dimensional finite element model of the arch compartment of the bridge is constructed using SAP2000 software to determine the dynamic characteristics, numerically. Operational Modal Analysis method is used to extract dynamic characteristics using Enhanced Frequency Domain Decomposition method. Numerically and experimentally identified dynamic characteristics are compared with each other and finite element model of the arch compartment of the bridge is updated manually by changing some uncertain parameters such as section properties, damages, boundary conditions and material properties to reduce the difference between the results. It is demonstrated that the ambient vibration measurements are enough to identify the most significant modes of long span highway bridges. Maximum differences between the natural frequencies are reduced averagely from %49.1 to %0.6 by model updating. Also, a good harmony is found between mode shapes after finite element model updating.

• 컴퓨터교육학회논문지
• /
• 제13권1호
• /
• pp.27-36
• /
• 2010

지식정보사회를 살아가는 사람들에게 가장 중요한 능력인 문제해결력, 창의성 등의 고등사고력을 신장시키기 위해 알고리즘과 프로그래밍 교육을 중학교 정보 교육과정에 도입한 것은 적절하다. 그러나 형식적 조작기에 도달하지 못한 구체적 조작기 학생들에게 고등교육의 알고리즘과 프로그래밍 교육내용을 축소하여 제공하는 것은 학생들의 인지부담만 가중되며, 알고리즘 학습에서 배운 원리와 전략이 문제해결을 위한 프로그래밍으로 학습 전이가 어렵다. 본 연구는 인지 발달 단계 중에서 구체적 조작기에 해당하는 학생들의 발달 특성을 고려하고, 알고리즘 학습이 프로그래밍으로 전이할 수 있도록 선 알고리즘 후 프로그래밍 학습 모형을 개발하였고, 구체적 조작기 학생들을 대상으로 하여 학습 동기와 학업성취도에 미치는 영향을 검증하였다. 그 결과 선 알고리즘 후 프로그래밍 모형으로 학습한 구체적 조작기 학생들의 학습동기와 학업성취도 향상에 유의미한 차이가 있었다.

• 한국산업정보학회논문지
• /
• 제16권3호
• /
• pp.137-147
• /
• 2011

본 연구는 정보기술의 품질이 조직성과에 미치는 과정을 실증분석을 통해 검정하고 결론을 제시하였다. 조직이 정보기술을 확보하는 것만으로는 조직성과를 향상시킬 수 없으며, 정보기술과 조직성과 사이에 매개역할을 수행하는 정보기술을 활용하는 활동이 필요하다. 본 연구에서는 정보기술의 품질을 기능품질과 운영품질로 구분하였다. 기능품질은 정보기술 자체가 지니는 특성으로, 운영품질은 정보기술이 조직 경영활동의 효과적인 지원으로 설정하였다. 연구모형 에서는 기능품질이 운영품질을 통해 조직성과로 이어진다는 것을 제안하였다. 실증분석 결과 정보기술의 기능품질이 운영품질을 통해 조직성과로 이어지는 과정이 통계적으로 유의하게 나타났다. 그러나 정보기술의 기능품질이 조직성과에 미치는 직접효과는 없는 것으로 나타났다. 마지막 결론에서는 본 연구가 가지는 경영 관점에서의 의미를 논의하고 향후 연구방향을 제시하였다.

• 한국프랜차이즈경영연구
• /
• 제11권4호
• /
• pp.31-44
• /
• 2020

Purpose: The purpose of this study is to examine the effects of CEO's self-determination on entrepreneurship, business performance (operational and financial performance). Also, this research provide some strategic insights for improving business performance. In the proposed model, self-determination consists of autonomy, competence, and relatedness, and entrepreneurship consists of innovation, initiative and risk sensitivity, and proactiveness. More specifically, this study proposes a framework that entrepreneurship and operational performance will play mediating roles between self-determination and financial performance. Research design, data, methodology: In this study, an online survey was conducted on SME CEOs for analysis, and a total of 122 samples were used. In the analysis process for hypothesis verification and evaluation, frequency analysis was first performed to identify the demographic characteristics of the respondents, and confirmatory factor analysis was conducted to assess the reliability and validity of the measurement model. In addition, a structural model analysis was conducted to examine the structural relationships between CEO's self-determination, entrepreneurship, and business performance (operational and financial performance) using SmartPLS 3.0. Results: The findings and summary are as follows. First, the autonomy of self-determination has a positive effect on entrepreneurship. Second, the competence of self-determination affects entrepreneurship and operational performance. Third, it affects the innovation, initiative and risk sensitivity of the CEO's entrepreneurship, and ultimately, its operational performance. The results show that the business performance of Start-up also increases when self-determination can be a factor in increasing entrepreneurship in three sub-dimensionalities. Conclusions: The conclusion of this study is that in order for SMEs to develop into a sustainable company by securing competitiveness after start-up, external motivation such as external help and support from the state (local government) is important, but competence and relationship, which are components of self-determination. The intrinsic motivation of the CEO may be more important. To this end, CEO's should prioritize learning for competency development, and the government should pay attention to providing various educational programs through establishment of education policies and education systems to enhance the competency of start-up CEO's.

• Architectural research
• /
• 제14권1호
• /
• pp.35-44
• /
• 2012

Build-Transfer-Lease (BTL) was introduced to the domestic construction market in 2005. Now, seven years later, the BTL model is most active for educational facilities. In 2011, 93 educational facility projects entered the maintenance stage. Considering the characteristics of today's BTL projects for educational facilities, the main issues are the initial performance and maintenance of educational facilities and the service-providing status for the 20-year operational management period, in relation to providing safety and convenience to students, the facility users. Seeking a solution, local education offices and departments in charge of BTL under the Ministry of Education, Science, and Technology have been exploring various methods of evaluating operational maintenance performance from various perspectives. For educational facility BTL projects, however, the appropriateness of initial operation performance evaluation, rather than considering the 20-year operational management period, is controversial in regards to sustainability. On this account, performance evaluation items in four areas-operational maintenance evaluation, facility performance status evaluation, maintenance subject evaluation, and sustainable change response evaluation-should be extracted. An indicator of facility performance evaluation is presented in this study through an AHP survey targeting experts, as part of establishing an operation performance evaluation system for educational facility BTL projects.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
• /
• pp.186-187
• /
• 2006

The development of SFCL (Superconducting Fault Current Limiter) is getting more important as the power demand is increased rapidly. Up to now, several kinds of SFCL have been proposed and it is expected that they will be applied to appropriate position considering their own properties. Amongst those proposed SFCL, flux-lock type SFCL using the magnetic cancelation for current limiting has the advantages of overcoming the technical difficulties that other types of SFCLs have. In this paper, the integrated three-phase flux-lock type SFCL was fabricated and its operational modes were investigated through the short circuit tests. The operational mode were to divided into four mode according to the variation of the currents flowing into the secondary winding connected the superconducting elements and the speed of the quench generation. It was expected that the improvement of current limiting characteristics of the SFCL could be possible through control of the operational mode.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2010년도 춘계학술대회 논문집
• /
• pp.123-125
• /
• 2010

As the exterior noise emitted by a vehicle is getting more and more attention, simulated pass-by measurements become more important. This well established method provides information about the total noise emitted by the vehicle. For a vehicle manufacturer it is not only interesting to know about the total noise but also to know how this total exterior noise is composed of different contributions, such as for example the contribution of the engine, the intake or exhaust system. Transfer path analysis (TPA) provides a separation of these contributions for each of the pass-by microphones alongside the track. Presented is a method for fast and efficient determination of the contributions of multiple sources using operational transfer path analysis (OTPA). The calculation of the transfer characteristics between the reference measurement points on the vehicle and the corresponding response points of both microphone lines are carried out while operation of the vehicle. As result of the contribution analysis from operational transfer path analysis, the characteristic noise level as function of the covered distance is displayed for all individual sound sources, thus providing in depth information for sound quality engineering.

• 한국광학회:학술대회논문집
• /
• 한국광학회 1990년도 광학 및 양자전자학 워크샵
• /
• pp.33-38
• /
• 1990

The carbon monoxide laser is one of useful light sources for precision laser instrumentation because of tis high efficiency and wideband characteristics. In this presentation, the liquid nitrogen cooled cw CO laser which is developed in KSRI will be reviewed

• 한국조리학회지
• /
• 제20권6호
• /
• pp.175-189
• /
• 2014

본 연구는 정보공개서의 재무자료를 이용하여 외식 프랜차이징 기업의 기업 특성과 성과를 관한 기초적인 정보를 제공하는데 목적이 있었다. 이에 본 연구에서는 2013기준 169개의 정보공개서를 바탕으로 프랜차이징의 규모, 마케팅역량, 운영특성과 성과에 관해 다중회귀분석으로 검증하였다. 첫째, 프랜차이징 규모와 성과에서 직영점수는 매출액, 당기순이익, 총점포수에 유의하였고, 가맹점수는 총점포수에만 유의한 것으로 나타났다. 둘째, 마게팅 역량 변수와 성과에서는 광고비는 매출액, 총점포수, 판촉비는 매출액, 당기순이익, 총점포수에 유의하였고, 광고비는 당기순이익에 유의하지 않게 나타났다. 마지막으로 운영특성과 성과에서는 사업기간 만이 매출액, 당기순이익, 총점포수에 유의하였고, 브랜드 수는 성과에 영향이 없었다. 본 연구의 가치로는 정보공개서를 이용하여 기타 외식 프랜차이징 기업의 규모, 마케팅역량, 운영특성 변수와 성과를 검증하는데 의의가 있었다. 시사점으로는 외식프랜차이징 기업의 재무성과에 영향을 주는 변수로는 직영점수, 광고비, 판매촉진비, 업력 등이 재무성과에 기여하였고, 비재무성과에는 광고비, 가맹점수 등에서 영향력이 높게 나타나, 기업의 경쟁의 위치에 따라 전략적 선택이 필요함을 시사해주고 있다. 한편, 횡단적 연구방법은 본 연구의 한계점으로 추후 연구에서는 이를 보완하여 종적인 패널데이터를 이용하여 연구한다면 더욱 가치 있는 연구가 될 것으로 사료된다.