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박대흠,차광석,정영관 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.2
A Fuel Cell is one of the solving to reduce greenhouse gases. Despite the high efficiency andenvironmental friendly of Household Fuel Cell System it has hardly obtained popularity mainly due to its highprices. In order to encourage use of the system prices and operational expenses need to become economical. Inthis study, optimization through simulation was conducted to find out the optimal operational condition. As a resultof simulation the system is operated with DSS operation from 5 O'clock until 19 O'clock for 13 hours at theconstant output of 0.4kW to maximize reduction of energy rate. Furthermore, instead of the domestic system withthe rated output of 1kW, rated output of the system should be reduced to 0.4 - 0.6kW which can promote installationof household Fuel Cell System.
가정용 연료전지 시스템의 요금 분석을 통한 최적 운전 방법 검토
박대흠,차광석,조호규,정영관 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.6
Despite the high efficiency and eco-friendly of Household Fuel Cell System it has hardly obtained popularity mainly due to its high prices. In order to encourage use of the system prices and operational expenses need to become economical. In this study, optimization through simulation was conducted to find out the optimal operational condition. As a result of simulation the system is operated with DSS operation from 5 Oʼclock to 19 Oʼclock for 14 hours at the constant output of 0.4kW to maximize reduction of energy rate. this DSS operation condition can reduce 200,000 won of energy rates in 35 pyoung apartment for a year. And, we can know that starting time of DSS operation don't effect to energy rates through the simulation. Furthermore, the household fuel cell system with the rated output of 1kW should be reduced to 0.4 - 0.6kW which can promote installation of household Fuel Cell System. Now, the household fuel cell system don't have been used widely due to economical efficiency. but, in the near future, Fuel Cell will be used to household by decrease of LNG price caused by development of shale gas.
On/Off 제어에 의한 습도와 결로의 제어에 관한 연구
박대흠,김두희,김경훈,정영관 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.6
The humidification is essential for performance enhancement of the electrolysis of PEMFC because proton conductivity depends on hydration of the proton exchange membrane. In this study, the humidification experiment did about On/Off control the humidification and dew condensation for PEMFC by using of the membrane humidifiers. As the results, it was possible to approximation control of the humidity by using of the solenoid valve On/Off control on the membrane humidifier. Also the problem on the dew condensation was resolved by approximation humidity control through solenoid valve On/Off control and the removal of the dew condensation in the flow channel was verified through visualization experiment.
Bowlby 애착이론의 핵심 개념인 “내적작동모델”에 대한 국내 연구 동향 분석
박대흠,송영숙 한국문화융합학회 2022 문화와 융합 Vol.44 No.11
The purpose of this paper is to analyze the current status of domestic research on the “internal working model(IWM)”of attachment formed by interactions between mother and child in the early stages of life, and to suggest directions for future research. The papers published in domestic journals from 1991 to 2021 on the topic of IWM of attachment were searched by RISS and Google scholar. And selected 35 papers among them. As a result of the analysis, by the samples of the study, the majority of research papers were 9 papers (34.6%) out of 26 papers targeting 20-year-olds and college students followed by 4 papers each targeting mothers and mother-child pairs (15%). And by subjects the study between the IWM of the primary caregiver and the IWM of mothers and children by the developmental period of their children showed the highest frequency with a total of 14 studies (40.0%). By research methods, 20 quantitative studies (57%) and 15 qualitative studies (43%), were relatively balanced. As for future research directions, the study participants are expanded to include the elderly, and the subject also suggests a study on the relationship between attachment type and death anxiety.
논문 : 헬스밴드 니즈에 관한 설문 조사와 그 통계적 분석
연명흠 ( Myeong Heum Yeoun ),박대관 ( Dae Kwan Park ),연명흠 ( Myeong Heum Yeoun ) 디자인융복합학회 2014 디자인융복합연구 Vol.13 No.3
웨어러블 디바이스가 새로운 IT 성장동력으로 기대를 모으며, 웰빙과 헬스케어에 대한 니즈가 증대되는 가운데, 건강정보를 측정, 조회해주는 손목 착용형 헬스 디바이스인 헬스밴드에 대한 관심이 높아지고 있다. 이 연구의 목적은 어떤 사용자가 어떤 헬스밴드를 원하는가에 대한 답을 얻는 것이다. 이를 위해 인구통계학적 문항, 운동-라이프스타일, 헬스밴드사용경험, 디자인, UI/GUI, 기능에 걸친 총 26개 문항으로 구성된 온라인 설문을 작성, 252명에게서 설문을 얻어, 교차분석 및 카이검정, 평균비교 및 분산분석 등의 통계를 실시하여 다음과 같은 결과를 얻었다. 2~30대 젊은층은 matrix 디스플레이를 채택한 밴드형 디바이스를 원하며, 여성은 남성에 비해 복잡하고 화려한 외형과 UI화면에 더 수용적이다. 단순한 외형을 원하는 사람은 심플한 UI화면을 선호하고, 그 반대도 성립된다. 50대 이상은 그 이전세대에 비해 화려한 외형에 더 수용적이다. 여성은 디자인에 있어서 단순한 쪽으로든 화려한 쪽으로든 확실한 선호 태도를 보인다. 분석 결과, 연령대와 성별과 같은 인구통계학적 변수는 헬스밴드의 특성을 결정하는데 의미있는 변수였으나, 운동정도나 운동유형과 같은 운동-라이프스타일 변수는 예상과 달리 예측력이 약했음을 알 수 있었다. 사용자 유형에 따른 차별화된 헬스밴드 디자인 컨셉 수립 등의 연구결과 활용이 기대된다. Wearable devices are expected to be the new IT growth engine. With the increased demand for better health care and well-being, so are the interest in wrist worn devices that measures and monitors personal health information. The purpose of this research is to understand who wants which health band. An online survey composed of 26 questions in 6 categories: demographic factors, exercise-lifestyle, user experience of health band, design, UI/UX, and Functions. 252 samples were gathered and analyzed using cross-tabulation, Chi-test, mean comparison, and ANOVA. The finding states: Younger people (Twenties and Thirties) prefer band types with a matrix display. Women prefer more flashy and fancier designs than man. Most people like simple designs with an easy to read UI screen. Seniors in their fifties and over are more acceptable to flashy styles compared to the younger users. Women shows a more resolute preference in design than man. Demographic factors such as gender and age group are strong factors in determining the type of health band designs. However, exercise-lifestyle factors such as exercise intensity and type of exercise are not a meaningful factors in determining the type of health bands. This Study can be utilized to differentiate the type of health band designs concepts according to the user demographics.
박대흠(Dae-heum Park),임종훈(Jong-hoon Lim),장시웅(Si-Woong Jang) 한국정보통신학회 2022 한국정보통신학회 종합학술대회 논문집 Vol.26 No.1
기존의 Tensorflow CNN 환경에서 Object 탐지 방식은 Tensorflow 자체적으로 Object 라벨링 작업과 탐지를 하는 방식이다. 그러나 현재 YOLO의 등장으로 이미지 객체 탐지의 효율성이 높아졌다. 그로 인하여 기존 신경망보다 더 많은 심층 레이어를 구축할 수 있으며 또한 이미지 객체 인식률을 높일 수 있다. 따라서 본 논문에서는 Darknet, YOLO를 기반으로 한 Object 탐지 시스템을 설계하고 기존에 사용하던 합성곱 신경망에 기반한 다중 레이어 구축과 학습을 수행함으로써 탐지능력과 속도를 비교, 분석하였다. 이로 인하여 본 논문에서는 Darknet의 학습을 효율적으로 이용하는 신경망 방법론을 제시하였다. In the existing Tensorflow CNN environment, the object detection method is a method of performing object labeling and detection by Tensorflow itself. However, with the advent of YOLO, the efficiency of image object detection has increased. As a result, more deep layers can be built than existing neural networks, and the image object recognition rate can be increased. Therefore, in this paper, the detection ability and speed were compared and analyzed by designing an object detection system based on Darknet and YOLO and performing multi-layer construction and learning based on the existing convolutional neural network. For this reason, in this paper, a neural network methodology that efficiently uses Darknet’s learning presented.