• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.764-766
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• 2022

본 시스템은 스마트폰에서 사용자의 음성을 이용해 집 안이나 밖에서 IoT 단말을 효율적으로 제어할 수 있는 시스템으로, 인식된 음성에 맞춰 가전제품 기동, 조명 조절 등 IoT 단말을 컨트롤한다. 사용자의 음성은 Json 형태의 명령으로 변환되어 에지 컴퓨팅 기술을 통해 저사양 단말이 고사양 단말의 유휴자원을 활용하며 명령에 따른 IoT 단말 컨트롤이 진행된다. 이러한 아키텍처는 IoT 단말 데이터를 외부에 노출하지 않고 컴퓨팅 자원을 효율적으로 운용할 수 있는 시스템을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.812-814
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• 2022

제어할 사물을 선택하기 위해 여러 단계를 거쳐야 하는 기존 '스마트 홈'의 단점을 보완하고자 본 논문에서는 사용자의 시선 방향을 추정하여 사용자가 바라보는 방향에 있는 사물을 제어할 수 있는 시스템을 제안한다. 일반 RGB 카메라를 통해 Pose Estimation으로 추출한 Landmark들의 좌표 값을 이용하여 시선 방향을 추정하는 알고리즘을 구현하였으며, 이는 근적외선 카메라와 Gaze Tracking 모델링을 통해 이루어지던 기존의 시선 추적 기술에 비해 가벼운 데이터를 산출하고 사용자와 센서간의 위치 제약이 적으며 별도의 장비를 필요로 하지 않는다. 해당 알고리즘으로 산출한 시선 추적의 정확도가 실제 주거환경에서 사용하기에 실효성이 있음을 실험을 통해 입증하였으며, 최종적으로 이 알고리즘을 적용하여 적외선 기기와 Google Home 제품에 사용할 수 있는 시선 방향 사물 제어 시스템을 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.911-914
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• 2007

최근 홈 네트워크 기술의 발달로 다양한 홈 네트워크 장치들이 개발되고 있다. 하지만 홈 네트워크 장치들을 제어하는 어플리케이션은 로컬에서만 가능하거나 특정한 기기와 그 플랫폼에 맞는 프로그램을 설치해야만 장치의 제어가 가능하다. 본 논문에서 이러한 문제점을 보안하기 위해 웹 서비스를 이용한 홈 네트워크 장치의 원격 제어 시스템의 구성과 웹 브라우저를 통한 웹 시나리오 빌더를 제안한다. 제안한 웹 시나리오 빌더는 네트워크 카메라로 댁내 상황을 알려주고, 시나리오를 제어 가능하게 하는 등 다양한 기능을 제공한다. 그리고 타블렛이나 터치스크린으로도 조작할 수 있는 간단한 UI 를 제공하며 웹 서비스를 이용하므로 PDA 나 모바일 기기로의 확장이 가능하다.

• Journal of Families and Better Life
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• v.20 no.3
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• pp.73-85
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• 2002

The purpose of this study was to develop and evaluate the Marital Equality Education Program for women farmers and their husband. Based on the empirical research result of 980 women farmers as basic study for developing this program, marital equality theory, system theory, strong family perspective, stress coping theory, anger control theory, modified Couple Communication Program, marriage enrichment methods, 7 session program was developed. The contents of every session were Reviewing Marriage Relationships, Coping Role Stress, Marital Equality, Self Expression & Speaking, Understanding Spouse & Listening, Anger Control& Resolving Conflict, and Enhancing Marital Relations. The effectiveness of this program was evaluated by pretest, post test, and follow-up 1 month later through 35 rural couples(women farmers and their husband) and it was analyzed by paired t-test and qualitative evaluation was also investigated. The major results were as follows : This program was effective in improving their self-esteem, marital satisfaction, coping role stress & conflicts, and husband's egalitarian role attitude & practice. The results suggested the program had also Positive impacts on the marital equality and relationships. Future research and practical implications were added.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.8
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• pp.3753-3771
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• 2016

Increasingly, numerous and various Internet-capable devices are connected in end user networks, such as a home network. Most devices use the combination of TCP and 802.11 DCF as a system platform, but whereas some devices such as a streaming video persistently generate traffic, others such as a motion sensor do so only intermittently with lots of pauses. This study addresses the issue of performance in this heterogeneous traffic wireless LAN environment from the perspective of fairness. First, instantaneous fairness is introduced as a notion to indicate how immediately and how closely a user obtains its fair share, and a new time-based metric is defined as an index. Second, extensive simulation experiments have been made with TCP Reno, Vegas, and Westwood to determine how each TCP congestion control corresponds to the instantaneous fairness. Overall, TCP Vegas yields the best instantaneous fairness because it keeps the queue length shorter than the other TCPs. In the simulations, about 60% of a fair share of the effective user bandwidth is immediately usable in any circumstance. Finally, we introduce two simple strategies for adjusting TCP congestion controls to enhance instantaneous fairness and validate them through simulation experiments.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.383-386
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• 2005

Low frequency heavy-weight impact noise is the most irritating noise in Korean high-rise reinforced concrete apartment buildings. This low frequency noise is generated by foot traffic due to the fact that Koreans do not wear shoes at home. The transmission of the noise is facilitated by a load bearing wall structural system without beams and columns which is used in these buildings. In order to control low frequency heavy-weight impact noise, floating floors using isolation materials such as glass-wool mat and poly-urethane mat are used. However, it was difficult to control low frequency heavy-weight impact sound using isolation material. In this study, reinforcement of concrete slab using beams and plate was conducted. Using the FEM analysis, the effect of concrete slab reinforcement using FRP(fiber-glass reinforced plastic) on the bang machine impact vibration acceleration level and sound were conducted at the standard floor impact sound test building. The $3{\sim}4dB$ floor impact vibration acceleration level and impact sound pressure level were reduced and the natural frequency of slabs were changed.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.3
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• pp.239-246
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• 2003

Brushless D.C. Motor is widely used for industrial application because of high efficiency and high power density. Especially, in home appliance, BLDCM is very useful due to high control performance and low acoustic noise. In this paper, BLDCM and its controller are designed and developed for tread mill application. With the restricted stator structure, permanent magnet rotor is designed for manufacturing and cost effectiveness using CAD and FEM analysis. A ferrite magnetic material is used as a rotor magnet for the cost and temperature advantages. For a stable operation of tread mill, over current and temperature can be detected and protected. The designed BLDCM and its controller was verified by the experimental results.

• International Journal of Contents
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• v.8 no.4
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• pp.42-49
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• 2012

Recently the unprecedented progress of Android platform and Google Play has brought more opportunities for individual mobile game developers. When playing an Android 3D game, users can accidentally hit HOME Key or BACK Key or receive an incoming message. Subsequently, another screen will appear on top and make the game application lose focus, or the operating system pause that game. These interruption events may also lead to the loss of game information or the game runs out of user control if that game cannot catch interruption events itself and resume at the exact time. As same as other mobile platforms, Android platform also provides Activity Lifecycle methods to help the game application control interruption problems. However, these methods are not adequate to solve all the interruption events. By implementing ANDCube game, we examine most of the possible interruption cases and propose some solutions to help Android game developers avoid some common interruption cases. Concurrently, we show the ways how a game application can catch all unavoidable interruption events and effectively resume from interruption to obtain a high quality game.

• Journal of Korea Multimedia Society
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• v.23 no.2
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• pp.155-165
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• 2020

In this paper, we propose a smart thermostat temperature set-point control method based on machine learning and rule engine, which controls thermostat's temperature set-point so that it can achieve energy savings as much as possible without sacrifice of occupants' comfort while users' preference usage pattern is respected. First, the proposed method periodically mines data about how user likes for heating (winter)/cooling (summer) his or her home by learning his or her usage pattern of setting temperature set-point of the thermostat during the past several weeks. Then, from this learning, the proposed method establishes a weekly schedule about temperature setting. Next, by referring to thermal comfort chart by ASHRAE, it makes rules about how to adjust temperature set-points as much as low (winter) or high (summer) while the newly adjusted temperature set-point satisfies thermal comfort zone for predicted humidity. In order to make rules work on time or events, we adopt rule engine so that it can achieve energy savings properly without sacrifice of occupants' comfort. Through experiments, it is shown that the proposed smart thermostat temperature set-point control method can achieve better energy savings while keeping human comfort compared to other conventional thermostat.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.2
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• pp.529-546
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• 2012

To address the need for autonomous control of remote and distributed mobile systems, Machine-to-Machine (M2M) communications are rapidly gaining attention from both academia and industry. M2M communications have recently been deployed in smart grid, home networking, health care, and vehicular networking environments. This paper focuses on M2M communications in the vehicular networking context and investigates areas where M2M principles can improve vehicular networking. Since connected vehicles are essentially a network of machines that are communicating, preferably autonomously, vehicular networks can benefit a lot from M2M communications support. The M2M paradigm enhances vehicular networking by supporting large-scale deployment of devices, cross-platform networking, autonomous monitoring and control, visualization of the system and measurements, and security. We also present some of the challenges that still need to be addressed to fully enable M2M support in the vehicular networking environment. Of these, component standardization and data security management are considered to be the most significant challenges.