• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제8권12호
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• pp.499-506
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• 2019

지능형 로봇은 사용자의 요구에 따라 상황에 맞는 작업을 선택하여 서비스를 수행할 수 있어야 하며, 다양한 상황에 대해서 현재 가장 적합한 작업이 무엇인지 비교하고 선택할 수 있어야 한다. 이를 위해 절차적 추론 시스템을 활용하는 기존의 지능형 로봇시스템은 작업 모델 내부에 우선도 함수를 정의하고 이를 활용하여 작업 간 우선도를 비교하는 방법으로 작업관리 기능을 제공하고 있었다. 하지만 이러한 기존의 방법은 다중 도메인 서비스를 수행하는 데에 있어, 우선도 결정 함수가 명시적이지 않아 일반적인 상황에 대한 우선순위를 결정할 수 없고, 유용성을 비교하기 위한 표준적인 기준이 존재하지 않아 각 서비스 간의 우선도를 비교하는 방법이 범용적이지 않으며, 이를 재사용하거나 확장할 수 없다는 한계점이 존재했다. 우리는 이를 개선하기 위해 작업관리를 위한 정책 모델과 이를 활용하여 작업의 우선도를 계산하는 방법인 정책 모델 주도 메타-플래닝을 제안한다. 정책 모델은 메타-플래닝 과정에서 작업의 유틸리티를 명시적으로 계산할 수 있는 기능을 제공하며, 기초 모델을 통해 다양한 서비스 간의 유용성을 비교할 수 있게 해준다. 또한, 모델의 구성을 온톨로지를 활용함으로써 확장성을 가지는 특징이 있다. 실험을 통해 동적 환경에서 정책 모델에 따라 로봇의 행동이 변화하는 것을 관찰할 수 있었고, 이를 통해 서비스가 필요에 따라 우선도의 비교를 통해 선택되는 것을 확인할 수 있었다.

• 터널과지하공간
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• 제31권4호
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• pp.270-288
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• 2021

본 연구에서는 입자기반 개별요소모델(grain-based distinct element model, GBDEM)을 이용하여 암석 균열의 역학적, 수리적 거동을 평가할 수 있는 수치해석기법을 제시하고 해석해와의 비교를 통해 검증하였다. 이는 DECOVALEX-2023 프로젝트 Task G의 일환으로 수행된 벤치마크 모델링 연구로, Task G는 결정질 암반 내 균열의 열-수리-역학적 복합거동을 해석하기 위한 수치해석기법을 개발하는 데에 목표가 있다. 본 연구에서는 사면체 개별 입자들을 이용하여 해석모델을 생성하고 3DEC을 이용하여 입자와 접촉에서의 거동을 해석하였다. 이 과정에서 등가연속체 개념을 적용해 입자기반모델의 미시물성을 산정할 수 있는 새로운 기법을 제시하였다. 한편, 균열 경사각과 거칠기, 경계응력조건 및 압력 조건에 따른 해석을 실시하여 각 해석조건이 균열의 수직, 전단방향 거동에 미치는 영향을 살펴보았다. 해석 결과, 제안된 수치모델은 경계응력에 따른 균열의 미끄러짐(fracture slip)과 유체 압력에 따른 균열의 개방(fracture opening), 균열 경사에 따른 응력 분포, 거칠기로 인한 전단변위의 구속 등을 합리적으로 재현하고 있음을 확인하였다. 수치해석을 통해 계산된 균열의 수직방향, 전단방향 변위는 모두 해석해를 통해 계산된 값과 거의 일치하는 결과를 보였다. 본 연구의 해석모델은 Task G에 참여하는 국외 연구팀들과의 의견 교류와 워크숍을 통해 지속적으로 개선하는 한편, 향후 다양한 조건의 실내시험에 적용하여 타당성을 검증할 예정이다.

• 한국항해항만학회지
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• 제31권4호
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• pp.309-315
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• 2007

We've investigated the characteristics on mariner's behavior in the collision situation through a full-mission ship handling simulator and considered that it's necessary to model the standard avoiding behavior of mariners in order to apply the obtained results more widely and effectively. Thus we described the contents of standard avoiding behavior taken by mariners in the collision situation and established the concept of the standard model based on human factors for collision avoidance in a previous study. As a following study, this paper is to propose the method of modeling on mariners' standard behavior for collision avoidance by analyzing the contents of mariner's information processing and the related factors using regression analysis. As a result, we confirmed the influence of relating factors to avoiding behavior in mariner's deciding decisions and proposed the modeling method of mariners' standard behavior for collision avoidance with a example of recognition model.

• 한국산업융합학회 논문집
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• 제17권2호
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• pp.42-53
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• 2014

Robust voice recognition (RVR) is essential for a robot to communicate with people. One of the main problems with RVR for robots is that robots inevitably real environment noises. The noise is captured with strong power by the microphones, because the noise sources are closed to the microphones. The signal-to-noise ratio of input voice becomes quite low. However, it is possible to estimate the noise by using information on the robot's own motions and postures, because a type of motion/gesture produces almost the same pattern of noise every time it is performed. In this paper, we propose an RVR system which can robustly recognize voice by adults and children in noisy environments. We evaluate the RVR system in a communication robot placed in a real noisy environment. Voice is captured using a wireless microphone. Navigation Strategy is shown Obstacle detection and local map, Design of Goal-seeking Behavior and Avoidance Behavior, Fuzzy Decision Maker and Lower level controller. The final hypothesis is selected based on posterior probability. We then select the task in the motion task library. In the motion control, we also integrate the obstacle avoidance control using ultrasonic sensors. Those are powerful for detecting obstacle with simple algorithm.

• 가정과삶의질연구
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• 제32권2호
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• pp.77-97
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• 2014

The purpose of this study was to examine 1) the relations among parent-reported, teacher-reported, and task-observed effortful control, and 2) the differences of preschoolers' effortful control based on preschoolers' gender and parenting behaviors (affectionate, controlled). In this study, the subjects were 221 preschoolers (104 boys, 117 girls) and their parents. The preschoolers' effortful controls was measured by Effortful Control Battery (Snack Delay, Turtle and Rabbit, and Red-Green Sign) and the Children's Behavior Questionnaire-Short Form. Parenting behavior was measured by the Parenting Style scale. The major results of this study were as follows. First, there were positive correlations between parent-reported effortful control and both teacher-reported and task-observed effortful control. Second, there were significant differences in preschoolers' effortful control by gender and level of affectionate parenting behavior. And there was an interaction effect between gender and level of affectionate parenting behavior on preschoolers' effortful control. The implications of this study were as follows. It is needed to evaluate effortful control in various circumstances and by multiple raters, and affectionate parenting behavior had an important role upon boys' effortful control rather than that of girls.

• 한국안전학회지
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• 제33권4호
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• pp.72-77
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• 2018

There are various approaches to prevent industrial accidents, of which the focus on human factors is behavior based safety(BBS). The BBS provides positive feedback on safety behavior and corrective feedback on unsafe behavior. Determining the feedback ratio of positive and correct feedback is an important issue in BBS. The purpose of this study was to examine the effects of positive and corrective feedback ratio on safety performance and feedback acceptance. The participants of this study were sixty undergraduate and graduate students at C University in Seoul, Korea. Participants were asked to work on a simulated welding task. The independent variable of was different positive vs. corrective feedback ratio (1:1 and 1:4). The dependent variables were the amount and the number of correctly completed work tasks, compliance rate of safety behavior, and feedback acceptance. The experimental design of this study was 2 x 2 mixed design. The results showed that feedback, regardless of the ratio, increased both correctly completed work tasks and the compliance rate of safety behavior, while 1:1 positive vs. corrective feedback ratio was more effective than 1:4 ratio. In addition, 1:1 ratio produced higher level of feedback acceptance compared to 1:4 ratio.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1051-1055
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• 2003

Policies are collections of general principles specifying the desired behavior and state of a system. Network management is mainly carried out by following policies about the behavior of the resources in the network. Policy-based (PB) network management supports to manage distributed system in a flexible and dynamic way. This paper focuses on configuration management based on Internet Engineering Task Force (IETF) standards. Network security approaches include the usage of intrusion detection system to detect the intrusion, building firewall to protect the internal systems and network. This paper presents how the policy-based framework is collaborated among the network security systems (intrusion detection system, firewall) and intrusion detection systems are cooperated to detect the intrusions.

• 디지털융복합연구
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• 제19권2호
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• pp.203-213
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• 2021

본 연구에서는 무경계 경력태도와 경력성공의 관계 및 네트워킹 행동의 매개효과에 대해 고찰하였다. 무경계 경력태도는 경력경로가 단일 고용상황의 울타리를 벗어나 다양한 환경에서 경험을 쌓을 수 있는 경력태도를 의미한다. 선행연구 검토를 토대로, 무경계 경력태도와 주관적 및 객관적 경력성공의 관계에 대해 가설을 설정하였다. 또한 사회적 자본의 하나인 네트워킹 행동 3가지를 두 변수 간의 매개변수로 설정하였다. 연구가설을 검증한 결과, 무경계 경력태도와 주관적 경력성공은 유의한 정(+)의 관계에 있으며 이 관계를 관계관리, 친교, 업무 네트워킹 행동이 완전매개하는 것으로 나타났다. 무경계 경력태도는 객관적 경력성공과 유의한 정(+)의 관계에 있으며 이 관계를 친교, 업무 네트워킹 행동이 완전매개하는 것으로 나타났다. 이상의 연구결과를 토대로 해석과 시사점 및 향후 연구방향을 제시하였다.

• 제어로봇시스템학회논문지
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• 제9권10호
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• pp.789-797
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• 2003

An implementation scheme and some improvements are proposed to adopt public-licensed operating system, Linux and de-facto world-wide network standard, TCP/IP into the field of behavior-based autonomous mobile robots. To demonstrate the needs of scheme and the improvement, an analysis is performed on a server/client communication problem with real time Linux previously proposed, and another analysis is also performed on interactions among TCP/IP communications and the performance of Linux system using them. Implementation of behavior-based control architecture on real time Linux is proposed firstly. Revised task-scheduling schemes are proposed that can enhance the performance of server/client communication among local tasks on a Linux platform. A new method of TCP/IP packet flow handling is proposed that prioritizes TCP/IP software interrupts with aperiodic server mechanism as well. To evaluate the implementation scheme and the proposed improvements, performance enhancements are shown through some simulations.

• 한국정보시스템학회지:정보시스템연구
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• 제17권2호
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• pp.73-94
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• 2008

Knowledge is a fundamental assets, therefore, the ability to create, acquire, integrate, and share knowledge has emerged as a fundamental organizational capability(Sambamurthy and Subramani, 2005). This apaper reports the results of an empirical study investigating the factors of acceptance and the moderating role of resistance in Knowledge Management Systems(KMS). The research model is based on the theory of planned behavior(TPB) and technology acceptance model(TAM). It includes the perceived usefulness instead of attitude, subjective norm, perceived behavior control and intention of acceptance of KMS. Also, three external variables namely task-technology fit, organizational support, and perceived rewards are added. In the research model, all hypothrses of the baseline model and the moderating effects of resistance were found to be significant. The authors also of fred several implications based chi the findings.