• 한국멀티미디어학회논문지
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• 제19권8호
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• pp.1587-1596
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• 2016

This paper presents an interactive locomotion controller using motion capture data and inverted pendulum model. Most of the data-driven character controller using motion capture data have two kinds of limitation. First, it needs many example motion capture data to generate realistic motion. Second, it is difficult to make natural-looking motion when characters navigate dynamic terrain. In this paper, we present a technique that uses dimension reduction technique to motion capture data together with the Gaussian process dynamical model (GPDM), and interpolates the low-dimensional data to make final motion. With the low-dimensional data, we can make realistic walking motion with few example motion capture data. In addition, we apply the inverted pendulum model (IPM) to calculate the root trajectory considering the real-time user input upon the dynamic terrain. Our method can be used in game, virtual training, and many real-time applications.

• 한국멀티미디어학회논문지
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• 제21권12호
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• pp.1493-1503
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• 2018

We propose an object recognition system and experiential game contents using Kinect to maximize object recognition rate by utilizing underwater robots. we implement an ice hockey game based on object-aware interactive contents to validate the excellence of the proposed system. The object recognition system, which is a preprocessor module, is composed based on Kinect and OpenCV. Network sockets are utilized for object recognition communications between C/S. The problem of existing research, degradation of object recognition at long distance, is solved by combining the system development method suggested in the study. As a result of the performance evaluation, the underwater robot object recognized all target objects (90.49%) with 80% of accuracy from a 2m distance, revealing 42.46% of F-Measure. From a 2.5m distance, it recognized 82.87% of the target objects with 60.5% of accuracy, showing 34.96% of F-Measure. Finally, it recognized 98.50% of target objects with 59.4% of accuracy from a 3m distance, showing 37.04% of F-measure.

• Journal of Power Electronics
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• 제19권1호
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• pp.254-264
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• 2019

This paper proposes an indirect current control technique based on a proportional resonant (PR) approach for the seamless mode transfer of utility interactive inverters. Direct-current and voltage hybrid control methods have been used for inverter control under grid-connected and islanded modes. A large bandwidth can be selected due to the structure of single-loop control. However, this results in poor dynamic transients due to sudden changes of the controller during mode changes. Therefore, inverter control based on indirect current is proposed to improve the dynamic transients by consistently controlling the output voltage under all of the operation modes. A PR-based indirect current control topology is used in this study to maintain the load voltage quality under all of the modes. The design processes of the PR-based triple loop are analyzed in detail while considering the system stability and dynamic transients. The mode transfer techniques are described in detail for both sudden unintentional islanding and islanded mode voltage quality improvements. In addition, they are described using the proposed indirect control structure. The proposed method is verified by the PSiM simulations and laboratory-scale VDER-HILS experiments.

• 대한산업공학회지
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• 제20권4호
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• pp.85-97
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• 1994

An interactive and iterative control panel layout method based on the constraint satisfaction problem (CSP) technique was developed to generate an ergonomically sound panel design. This control panel layout method attempts to incorporate a variety of relevant ergonomic principles and design constraints, and generate an optimal or, at least, a "satisfactory" solution through an efficient search algorithm. The problem of seeking an ergonomically sound panel design should be viewed as a multi-criteria design problem and most of the design objectives should be understood as constraints. Hence, a CSP technique was employed in this study for dealing with the multi-constraints layout problem. The efficient search algorithm using "preprocess" and "look_ahead" procedures was developed to handle vast amount of computation. In order to apply the CSP technique to the panel layout procedure, the ergonomic principles such as spatial compatibility, frequency-of-use, importance, functional grouping, and sequence-of-use were formalized as CSP terms. The effectiveness of the proposed panel layout method was evaluated by example problems and the results clearly showed that the generated layouts properly considered various ergonomic design principles.

• 제어로봇시스템학회논문지
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• 제13권9호
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• pp.832-837
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• 2007

Electroencephalographic(EEG) is used to record activities of human brain in the area of psychology for many years. As technology develope, neural basis of functional areas of emotion processing is revealed gradually. So we measure fundamental areas of human brain that controls emotion of human by using EEG. Hands gestures such as shaking and head gesture such as nodding are often used as human body languages for communication with each other, and their recognition is important that it is a useful communication medium between human and computers. Research methods about gesture recognition are used of computer vision. Many researchers study Emotion Recognition method which uses one of EEG signals and Gestures in the existing research. In this paper, we use together EEG signals and Gestures for Emotion Recognition of human. And we select the driver emotion as a specific target. The experimental result shows that using of both EEG signals and gestures gets high recognition rates better than using EEG signals or gestures. Both EEG signals and gestures use Interactive Feature Selection(IFS) for the feature selection whose method is based on a reinforcement learning.

• 한국게임학회 논문지
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• 제7권4호
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• pp.81-92
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• 2007

최근 들어 NPR(Non-Photorealistic Rendering) 기법을 이용한 게임들이 많아지고 있다. 그렇지만 게임에서 적용하고 있는 NPR 기법들은 몇 가지 종류로 한정되며, 특히 카툰렌더링에 집중되고 있다. 본 논문에서는 그간 연구가 거의 이루어지지 않았던 게임에 적용 가능한 코믹북 스타일의 NPR 기법을 제안한다. 이를 위해 먼저 코믹북의 비주얼과 셀 애니메이션 비주얼의 차이점을 비교, 분석하여 코믹북 스타일의 비주얼에 대한 표현 요소를 도출한다. 다음으로, 도출된 세 가지 표현 요소, 외곽선 스케치, 톤, 해칭을 효과적으로 구현하기 위한 렌더링 알고리즘들을 제시한다. 마지막으로 이 알고리즘이 적용된 게임을 제작함으로써 게임을 위한 알고리즘으로 적용이 가능한지를 검증한다.

• 대한의용생체공학회:의공학회지
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• 제19권2호
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• pp.199-210
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• 1998

본 논문에서는 전산화된 인체 해부도의 필수 기능인 3차원 볼륨 가시화 기법을 제시한다. 오브젝트순서에 기반한 광선 추적과 런-길이 인코딩의 장점을 이용한 이진 볼륨 렌더링 기법은 경계 추출된 칼라 슬라이스로 구성된 볼륨 데이터를 이용하여, 특정 하드웨어의 도움없이 일반 PC에서 대화식 수준의 속도로 3차원 가시화를 수행한다. 이 방법은 이진 볼륨 렌더링을 위해 필요한 이진 깊이 화상의 구성을 간소화하고 새루운 법선 벡터 계산 방법을 적용하여 렌더링 시간의 향상을 꾀하였다. 이와 함께 화질의 손실 없이 관련 데이터의 양을 줄이는 3D경계 인코딩 방법도 제시한다. 본 논문에서 제시한 렌더링 방법의 대화식 수준의 속도와 인코딩 방법의 정보 저장면에서의 효율성은 PC에서 운용될 수 있는 의학 해부도 응용 프로그램의 개발을 보다 가속화할 것이다.

• Nuclear Engineering and Technology
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• 제53권2호
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• pp.532-548
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• 2021

Nuclear power plants contain several monitoring systems that can identify the in-vessel phenomena of a severe accident (SA). Though a lot of analysis and research is carried out on SA, right from the development of the nuclear industry, not all the possible circumstances are taken into consideration. Therefore, to improve the efficacy of the safety of nuclear power plants, additional analytical studies are needed that can directly monitor severe accident phenomena. This paper presents an interacting multiple model (IMM) based fault detection and diagnosis (FDD) approach for the identification of in-vessel phenomena to provide the accident propagation information using reactor vessel (RV) out-wall temperature distribution during severe accidents in a nuclear power plant. The estimation of wall temperature is treated as a state estimation problem where the time-varying wall temperature is estimated using IMM employing three multiple models for temperature evolution. From the estimated RV out-wall temperature and rate of temperature, the in-vessel phenomena are identified such as core meltdown, corium relocation, reactor vessel damage, reflooding, etc. We tested the proposed method with five different types of SA scenarios and the results show that the proposed method has estimated the outer wall temperature with good accuracy.

• International Journal of Computer Science & Network Security
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• 제23권8호
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• pp.63-76
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• 2023

Identity and access management in cloud computing is one of the leading significant issues that require various security countermeasures to preserve user privacy. An authentication mechanism is a leading solution to authenticate and verify the identities of cloud users while accessing cloud applications. Building a secured and flexible authentication mechanism in a cloud computing platform is challenging. Authentication techniques can be combined with other security techniques such as intrusion detection systems to maintain a verifiable layer of security. In this paper, we provide an interactive, flexible, and reliable multi-factor authentication mechanisms that are primarily based on a proposed Authentication Method Selector (AMS) technique. The basic idea of AMS is to rely on the user's previous authentication information and user behavior which can be embedded with additional authentication methods according to the organization's requirements. In AMS, the administrator has the ability to add the appropriate authentication method based on the requirements of the organization. Based on these requirements, the administrator will activate and initialize the authentication method that has been added to the authentication pool. An intrusion detection component has been added to apply the users' location and users' default web browser feature. The AMS and intrusion detection components provide a security enhancement to increase the accuracy and efficiency of cloud user identity verification.

• 디지털콘텐츠학회 논문지
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• 제13권3호
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• pp.439-449
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• 2012

현재 많은 인터랙티브 아트 작품은 예술과 과학기술의 융합을 통해 많이 제작되고 있다. 이때에는 예술가 또는 디자이너들의 예술적 감각들을 다른 분야와 협업 및 융합을 위해 객관적으로 분석, 증명하고, 데이터화하여 공유해야 한다. 이와 같은 맥락에서 본 연구에서는 주제영역을 배경영역보다 '강조'하는 칸딘스키의 작품들을 색상 수, 면 수, 명도 단계의 정도를 중심으로 분석한다. 이를 통해 한 화면에 있어 뷰어들의 시선을 유도하고 안정감 있는 화면 구성을 위해 "주제영역"을 어떻게 표현했는지를 파악한다. 분석 결과, 주제 영역은 배경 영역보다 색상 수와 면의 수, 그리고 명도단계의 수가 많음을 알 수 있다. 또한 이 파악된 데이터를 바탕으로 인터랙티브 아트 작품을 제작한다. 본 논문은 융합과 협업이 요구되는 시대적 배경에서, 공통의 정보를 공유하여 협업을 가능하게 하는데 기여 할 수 있다. 또한 예술교육을 받지 않은 다른 영역의 제작자들이 비주얼 화면을 구성할 경우에도 도움이 될 수 있을 것으로 기대한다.