• 한국자동차공학회논문집
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• 제21권3호
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• pp.148-156
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• 2013

Since the demand for new military vehicle to fulfill the necessary conditions such as multi-purpose, high-mobility, and survivability has raised continuously from the army, the prototype of a Korean light tactical vehicle was developed to meet these requirements using our own technology. In particular, the new tactical vehicle was equipped with a double wishbone independent suspension to improve ride and handling and maximize off-road driving performance. In this paper, a comprehensive virtual durability process to evaluate the service life of the prototype is presented. A reliability of the trimmed body model based on CATIA data was verified by comparison result between mode analysis and modal test. The dynamic model was constructed using ADAMS/Car, and then the weight distribution and lateral slope driving performance of it were compared with the results of static weight and lateral slope tests. The validity of the VTL(Virtual Test Lab) was checked with test results from the 3-inch spaced impact road. The durability performances of trimmed body and suspension components were evaluated through MSM(Modal Superposition Method) fatigue analysis. It is shown that the virtual durability process could be a helpful tool to find out the weak areas and improve their structures in developing new military vehicle.

• 한국자동차공학회논문집
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• 제21권2호
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• pp.26-36
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• 2013

Purpose of this study is to develop virtual components and environment for developing a controller of an Active Air Suspension System in laboratory that slough off existing development environment using real vehicle test. This paper presents an air spring modeling and analysis of air suspension system for a commercial vehicle. Preferentially, It was performed vehicle test for pneumatic system and an air spring for characteristic analysis of system. Each component of an air spring suspension system was developed through emulations and modeling of system for pressure and height sensors in the basis on test results in SILS environment. Non-linear characteristics of air spring are accounted for using the measured data. Also, pressure and volume relations for vehicle hight control is considered. After performance verification of virtual model was performed, we developed virtual environment based on HILS for an Active Air Suspension System. We studied estimation and verification technology for control algorithm that developed.

• 인터넷정보학회논문지
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• 제18권5호
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• pp.103-112
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• 2017

Work engagement and job burnout are crucial problems in Korea, particularly in the business environment, and they also indicate people's motivation. Online-based teams in e-business also have these issues. Especially the role of the leader in this new type of teams is more crucial for members' motivation, behavior, and performance. Contingency leadership theories posit that different situations need different traits or behaviors of a leader. For an online-based team, which is internet-based team in e-business, a leader should use specific communication strategies to enhance a team's performance and members' motivation. In an online-based team and an offline-based team, the ways in which leaders motivate members will be different. This paper suggests particular communicative strategies for leaders of online situations. Online-based team members communicate using mobile phones or IT tools, and leaders mayinfluences members in virtual meetings. Moreover, online-based leadership needs to be more entrepreneurial and risk encouraging, and less conservative than offline-based leadership. In addition, online-based leadership should be energetic, decisive, adaptable, and inspiring, and furtherutilize communication tools such as being more gregarious/talkative, assertiveness, linguistic diversity and affect. This paper explains the roles of communicative elements such as coordination, expression, direction-giving/uncertainty reduction, empathy, meaning-making, satisfaction, and competence to decrease job burnout and to increase work engagement. The purpose of this study is to suggest communication strategies' differentiated influences on work engagement and job burnout in an online-based team.

• 한국정보통신학회논문지
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• 제26권10호
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• pp.1432-1440
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• 2022

최근 VDI(Virtual Desktop Infrastructure)가 오피스 업무 환경뿐만 아니라 고사양의 멀티코어 기반 어플리케이션을 사용하는 워크로드에도 많이 사용되면서 VDI에 대한 실시간성과 안정성에 대한 요구 사항이 증대되고 있다. 그에 따라 VDI에서 원격접속에 사용되는 디스플레이 프로토콜과 가상머신의 성능 최적화 또한 중요성이 높아졌다. 본 논문에서는 멀티코어 기반 어플리케이션 운용을 위한 데스크탑 가상화 구성을 위해 두 가지를 제안한다. 첫 번째는 멀티 프로세싱으로 인한 고부하 상황에서 최적의 성능을 가진 디스플레이 프로토콜의 코덱 구성을 제안한다. 두 번째는 가상머신 간 CPU 경합 시 스케쥴링 지연을 줄이기 위한 가상 CPU 스케쥴링 최적화 방안을 제안한다. 시험 결과 Blast Extreme의 H.264 코덱이 가장 좋고 안정적인 프레임을 보여줬으며 스케쥴링 최적화를 통해 가상 CPU의 스케쥴링 성능이 개선됨을 확인하였다.

• 전력전자학회논문지
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• 제21권5호
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• pp.404-410
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• 2016

To avoid the stability issues of LLCL filters, passive or active damping methods to eliminate the resonance phenomena are required. In this paper, system stability of a current control is analyzed when the active damping scheme based on the virtual resister is utilized in single-phase grid converter systems with LLCL input filters. The control performance according to the parameters of the virtual resistance is investigated. The validity of stability analysis was verified by simulation and experimental results.

• 한국생물정보학회:학술대회논문집
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• 한국생물정보시스템생물학회 2003년도 제2차 연례학술대회 발표논문집
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• pp.95-100
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• 2003

In this paper, we propose solutions to resolve the problem of many spelling variants and the problem of lack of annotated corpus for training, which are two among the main difficulties in named entity recognition in biomedical domain. To resolve the problem of spotting valiants, we propose a use of edit-distance as a feature for SVM. And we propose a use of virtual examples to automatically expand the annotated corpus to resolve the lack-of-corpus problem. Using virtual examples, the annotated corpus can be extended in a fast, efficient and easy way. The experimental results show that the introduction of edit-distance produces some improvements in protein name recognition performance. And the model, which is trained with the corpus expanded by virtual examples, outperforms the model trained with the original corpus. According to the proposed methods, we finally achieve the performance 75.80 in F-measure(71.89% in precision,80.15% in recall) in the experiment of protein name recognition on GENIA corpus (ver.3.0).

• 지식경영연구
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• 제9권4호
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• pp.127-142
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• 2008

최근 조직 내 정보시스템이 제공하는 지식과 정보에 대한 공유와 교환이 더 이상 성공적이라고 판단되지 않음에 따라 그 대안으로써 가상공동체(Virtual Community)가 주목받고 있다. 그러나, 가상공동체에서 살아있는 지식과 정보의 공유를 위해서는 공동체 안의 구성원인 리더와 구성원(팔로워) 들의 상호작용을 통한 몰입이 매우 중요하다는 인식이 확산되었다. 그러나, 이러한 몰입에 영향을 주는 리더-구성원 간의 영향관계는 충분히 연구된 바 없다. 이에 본 연구는 가상공동체에서 리더의 리더십 스타일과 팔로워의 특성 그리고 이들 간의 동기와 신뢰가 가상공동체의 몰입에 미치는 인과관계에 대해 분석하고자 하였다. '지각된 리더의 배려'로 측정된 '서번트 리더십'과 '지각된 리더의 조직지향'을 통해 측정된 '변혁적 리더십'이 구성원의 팔로워십과 동기, 리더와 조직에 대한 신뢰에 어떠한 영향을 미치는지 460명의 가상공동체 구성원을 통해 실증적으로 분석하였다. 분석결과 서번트 리더십과 구성원의 팔로워십 특성이 구성원의 몰입에 있어서 중요한 역할을 수행함을 알 수 있었다.

• 한국전자거래학회지
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• 제20권1호
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• pp.217-241
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• 2015

온라인 커뮤니티 구성원들의 참여를 독려하고 비행을 막기 위해 어느 수준의 익명성을 보장하여야 하는지에 대한 연구가 시급하다. 그러나, 선행연구들은 익명성의 개념이나 구분에 대한 체계적인 연구를 진행하지 못하였을 뿐만 아니라, 온라인 커뮤니티의 가상 팀 활동에 익명성이 어떠한 영향을 미칠 수 있는지에 대한 연구가 부족하였다. 본 연구에서는 익명성의 개념 및 효과에 대한 선행연구를 종합하고, 익명성을 1) 실명(무익명), 2) 별명(부분 익명), 3) 임의의 숫자 아이디를 임시로 부여(완전 익명)의 세 가지 수준으로 구분하였다. 이러한 익명성의 차이가 온라인 커뮤니티 구성원들의 신뢰 및 인지된 신원 노출 위험에 영향을 미침으로써, 결과적으로 가상 팀 성과에 어떠한 영향을 미치는지를 실증적으로 검증하였다. 실험실 실험이 수행되었으며, 온라인 커뮤니티의 실제 모습을 반영하기 위해 정착된 커뮤니티의 가상 팀 상황을 만들어 자료를 수집하였다. 총 364개의 응답이 수집된 가운데, ANOVA와 PLS를 활용하여 자료를 분석하였다. 연구 결과, 실명과 별명을 부여한 익명성 집단간 차이는 유의하지 않았으며, 임의의 아이디를 임시로 부여하였던 집단만이 인지된 익명성에 유의한 차이를 보였다. 동시에 익명성의 효과는 정착된 커뮤니티의 가상 팀 상황에서는 신뢰, 인지된 위험에 유의한 영향을 미치지 못하는 것으로 조사되었다. 이러한 연구 결과는 온라인 커뮤니티 실무에서 보다 전략적인 커뮤니티 구성원의 익명성 보호 전략을 수립하는데 도움을 줄 수 있을 것으로 판단한다.

• 한국자동차공학회논문집
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• 제23권1호
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• pp.122-129
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• 2015

Excessive overheating to a manual transmission clutch system under operating conditions can be considered the main reason of its performance degradation. The clutch system has to be ensured with its service life by showing that it passes the extreme tests called anti-fade test and hill start test in a certain design step. In general, design feedbacks from these kinds of the experiments are adapted to the system to enhance its performance. However, it usually takes much time and costs a lot due to the repetition of the tests. In this research, a process to calculate temperature of the clutch system was developed to determine whether the design can be passed the anti-fade test and hill start test in the design phase. The process incorporates many CAE techniques such as heat transfer analysis using 1D dynamic simulation method, system dynamics, CFD and parametric optimization. CFD is utilized to analyze 3-dimensional heat transfer of the clutch system and fluid dynamics of air in the clutch housing. The process was applied for the clutch systems in several vehicle models. The results was compared with those of the experiment. The applicability of the developed process was verified by comparing the predicted results with experimental results.

• ETRI Journal
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• 제25권1호
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• pp.34-40
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• 2003

This paper considers a TMN-based management system for the management of public ATM switching networks using a four-level hierarchical structure consisting of one network management system, several element management systems, and several agent-ATM switch pairs. Using Jackson's queuing model, we analyze the effects of one TMN command on the performance of the component ATM switch in processing local calls. The TMN command considered is the permanent virtual call connection. We analyze four performance measures of ATM switches- utilization, mean queue length and mean waiting time for the processor directly interfacing with the subscriber lines and trunks, and the call setup delay of the ATM switch- and compare the results with those from Jackson's queuing model.