• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.4
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• pp.107-113
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• 2023

This paper proposes a method for detecting smoking behavior in images using artificial intelligence technology. Since smoking is not a static phenomenon but an action, the object detection technology was combined with the posture estimation technology that can detect the action. A smoker detection learning model was developed to detect smokers in images, and the characteristics of smoking behaviors were applied to posture estimation technology to detect smoking behaviors in images. YOLOv8 was used for object detection, and OpenPose was used for posture estimation. In addition, when smokers and non-smokers are included in the image, a method of separating only people was applied. The proposed method was implemented using Google Colab NVIDEA Tesla T4 GPU in Python, and it was found that the smoking behavior was perfectly detected in the given video as a result of the test.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.6
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• pp.1-7
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• 2023

This paper developed a training model to classify normal roads and flooded roads using artificial intelligence technology. We expanded the diversity of learning data using various data augmentation techniques and implemented a model that shows good performance in various environments. Transfer learning was performed using the CNN-based Resnet152v2 model as a pre-learning model. During the model learning process, the performance of the final model was improved through various parameter tuning and optimization processes. Learning was implemented in Python using Google Colab NVIDIA Tesla T4 GPU, and the test results showed that flooding situations were detected with very high accuracy in the test dataset.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.127-131
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• 2009

본 논문에서는 디지털 통신에서 비트 전송율을 향상 시킬 수 있는 웨이브릿 편이 변조 시스템을 제안한다. 기존의 웨이브릿 편이 변조 시스템에서는 스케일링 함수(scaling function)를 1로, 웨이브릿(wavelet)을 0으로 할당하여 0과 1을 구분하였다. 제안한 방식은 스케일링 함수와 웨이브릿 그리고 이 두 신호를 반전시킨 4개의 반송파를 사용하여 변조한다. 즉, 웨이브릿은 00, 반전된 웨이브릿은 01, 스케일링 함수를 10, 반전된 스케일링 함수를 11로 할당하여 비트 전송률을 2배로 향상시키고자 한다. 복조시에는 4개의 상관기를 이용하여 원래의 2진 데이터(2비트)를 복원하였다. 모의실험 결과 제안한 방식이 기존의 웨이브릿 편이 변조 시스템에 비해 전송효율이 2배 향상되었음을 알 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.672-675
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• 2012

음성은 가장 익숙하고 편리한 의사 소통 수단으로 스마트폰과 같이 크기가 작은 모바일 기기의 입력 인터페이스로 적합하다. 서버 기반의 음성 인식은 서버를 방문하는 다양한 사용자들을 대상으로 음성 모델을 구축하기 때문에 음성 인식률을 높일 수 있고 상용화가 가능하다. 구글 음성인식, 아이폰의 시리(SiRi)가 대표적인 예이며 최근 스마트폰 사용자의 증가로 이에 대한 수요가 급증하고 있다. 서버 기반 음성 인식 기법에서 음성 인식은 스마트폰과 인터넷으로 연결되어 있는 원격지 서버에서 이루어진다. 따라서, 사용자는 스마트폰에 저장된 음성 데이터를 인터넷을 통하여 음성 인식 서버로 전달해야 된다[1, 2]. 음성 데이터는 사용자 고유 정보를 가지고 있으므로 개인 인증 및 식별을 위한 용도로 사용될 수 있으며 음성의 톤, 음성 신호의 피치, 빠르기 등을 통해서 사용자의 감정까지도 판단 할 수 있다[3]. 서버 기반 음성 인식에서 네트워크로 전송되는 사용자 음성 데이터는 제 3 자에게 쉽게 노출되기 때문에 화자의 신분 및 감정이 알려지게 되어 프라이버시 침해를 받게 된다. 본 논문에서는 화자의 프라이버시를 보호하기 위하여 사용자 음성 데이터로부터 개인의 고유 특징 및 현재 상태를 파악할 수 있는 감정 정보를 제거하는 기법을 설계 및 구현하였다.

• Journal of Auto-vehicle Safety Association
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• v.11 no.2
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• pp.23-28
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• 2019

This paper presents an optimal performance of rear wheel steering vehicle for maneuverability. The maneuverability of vehicle is evaluated in terms of yaw rate, body slip angle and driver input. The maneuverability of vehicle can be improved by rear wheel steering system. To obtain optimal performance of rear wheel steering vehicle, the optimal control history is designed. The high dimensional trajectory optimization problem is solved by formulating a quadratic program considering rear wheel steer input. To evaluate handling performance 7 degree-of-freedom vehicle model with actuation sub-models is designed. A step steer test is conducted to evaluate rear wheel steering vehicle. A response time, a TB factor, overshoot, and yaw rate gain are investigated through objective criteria, assessment webs. The handling performance of vehicle is evaluated via computer simulations. It has been shown from simulation studies that optimal controlled rear wheel steering vehicle provides improved performance compared to others.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.18 no.2
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• pp.96-101
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• 2019

This paper presents a machinability evaluation of Inconel 718 material when using a new uniform-temperature indirect cooling method that incorporates constant-pressure liquid nitrogen (LN2). The flank wear of a TiAlN coated tool used with this indirect cooling system was much lower than that of the tool used with dry machining under all machining conditions. Also, the surface roughness resulting from machining with this indirect method was far less than that of a dry machined surface after the same cutting time. Reduced heat generation and uniform temperature in turning operations play important roles in tool life and surface quality.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.815-817
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• 2022

This paper is about the development of an automatic stair climbing trolley for carrying loads without manpower. The design of tri-wheeled structure and center of mass enable the trolley to move on flat ground and also to ascend stairs by self-balancing. The overall design enables the trolley to avoid collision to walls when the trolley rotates on domestic landings. When the camera recognizes the stair, the sensor measures distance from the trolley to the stair. Then the trolley can move to align itself in the middle of the stair and it starts climbing. It can ascend to a specific floor based on the floor number entered by the user. As a result, the automatic stair climbing trolley is expected to help humans by protecting from accidents of dropping loads and saving their power. It is also expected to use for various purposes such as delivering packages, moving and carrying heavy loads in buildings without elevator.

• The Journal of the Acoustical Society of Korea
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• v.27 no.1
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• pp.12-17
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• 2008

Taepyeongso was introduced from China during the end of the Goryeo period and was used widely in Daechwita (military processional music), Pungmul-nori (farmers music), Buddhist music, royal ancestral rite music, and Sinawi, the instrumental accompaniment to shaman dances. Now, It has been popular as it is used for pop music and it is easy to learn. In this paper, Taepyeongso was analyzed for electronic Taepyeongso using physical modeling. We extracted resonance properties of Taepyeongso through the analysis of Taepyeongso sound. We analyzed the bell, the bore and the mouthpiece using FFT and LPC curve. As a result, the bell could be represented 2 pole filter and reflection filter between bore and bell.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.755-758
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• 2007

플래시 메모리는 휴대폰, MP3 플레이어, 개인휴대정보단말기(PDA), 휴대용 멀티미디어 플레이어(PMP), 디지털 카메라 및 캠코더와 같은 이동성이 강한 소형기기에서 가장 많이 사용되는 저장 매체이다. 최근 대용량의 값싼 플래시 메모리가 등장하면서 랩톱이나 데스크톱과 같은 일반적인 컴퓨팅 환경을 지닌 기기들에서도 그 사용이 확대되고 있는 추세이다. 플래시 메모리가 보다 범용적인 저장 장치로 사용되기 위해서는 일반 컴퓨팅 환경에서의 복잡한 작업 부하에서도 우수한 성능을 제공할 수 있는 플래시 변환 계층(Flash Translation Layer)이 반드시 필요하다. 아쉽게도 현재까지 연구된 FTL 기법들은 소형기기의 단순한 작업 부하에 알맞도록 설계되어 있으며, 일반 컴퓨팅 환경과 같이 복잡한 작업 부하를 지닌 환경에서는 우수한 성능을 제공하지 못한다는 단점을 가지고 있다. 본 논문에서는 일반 컴퓨팅 환경의 복잡한 작업 부하에 대해서도 우수한 가비지 수집 성능을 제공하는 새로운 로그 블록 교체 기법을 제안하였다. 실험을 통한 평가 결과, 제안한 기법은 기존 기법 대비 평균 35% 정도의 가비지 수집 부하를 감소시키는 것으로 나타났다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.52 no.1
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• pp.35-42
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• 2019

We investigated the protective effects of antioxidant fractions from a 70% ethanolic extract of Hizikia fusiformis in human dermal fibroblasts (HDFs). Powdered H. fusiformis was extracted with 70% ethanol and then partitioned into three fractions according to polarity using n-hexane (HFH), chloroform (HFC), and ethyl acetate (HFEA). Antioxidant activity was observed in HFEA at 0.66 mg/mL based on the half maximal inhibitory concentration ($IC_{50}$) of 1,1-diphenyl-2-picrylhydrazyl (DPPH), and at 0.24 mg/mL based on alkyl radical scavenging. The protective effects of the HFEA antioxidant fraction against 2,2-azobis-(2-amidinopropane) dihydrochloride (AAPH)-damaged HDFs and the expression of Type I procollagen in HDFs were examined. HFEA caused the proliferation of HDFs with and without AAPH treatment and protected against AAPH damage to HDFs in a dose-dependent manner ($50-200{\mu}g/mL$). This implies that the antioxidant properties of the fractions depended on their proliferative and protective effects. The HFEA antioxidant fraction had significant effects and caused the dose-dependent expression of Type I procollagen, an important anti-wrinkle protein, in HDFs. In conclusion, antioxidant substances in H. fusiformis were found in the ethyl acetate fraction, and the resulting HFEA may have cosmetic applications.