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소비자 조사와 착의 실험을 통한 온도감응형 기능성 의류개발을 위한 기초연구
상정선 ( Jeong-seon Sang ),정경화 ( Kyunghwa Chung ),박주현 ( Juhyun Park ),오경화 ( Kyung Wha Oh ) 한국의류산업학회 2017 한국의류산업학회지 Vol.19 No.1
In this research, consumer awareness investigation and wearing test were carried out for obtaining useful data on the development of thermo-sensitive functional clothing material. A survey involved 216 people in Seoul and Kyeonggi- do, and 200 questionnaires data were analyzed by descriptive statistics and frequency using SPSS 17.0. Four healthy men in twenties were participated for wearing test. Subjects in normal loungewear were exposed to temperature change from the initial temperature 30oC down to 5oC for an hour in a climate chamber. The environmental temperature, surface temperature of garment and skin were measured. As a result, most of respondents have all season clothing products such as underwear, hosiery, and jogging suit for loungewear. Also, thermo regulator y functional clothes are frequently used as underwear and sweat shirt. The consumer awareness investigation on thermo regulatory functional clothing showed that the most important key buying factor is quick climate temperature response, easy maintenance, design and cost, in that order. Surface temperature of garment went down with the cooling down of environmental temperature. The lower environmental temperature, the greater temperature difference by body part showed. Skin temperature change by environmental temperature showed similar tendency of garment surface temperature. In comparison between garment surface and body skin, temperature difference became larger under the lower environmental temperature.
Fingertip Force and Muscle Activation Patterns at Varying grasp Objects
Suji Park(Suji Park),Juhyun Park(Juhyun Park),Seyeon Oh(Seyeon Oh),Chaeyeon Heo(Chaeyeon Heo),Sieun Ho(Sieun Ho),Seonhong Hwang(Seonhong Hwang) 호서대학교 기초과학연구소 2022 기초과학연구 논문집 Vol.30 No.1
In this study, we tried to collect and analyze the kinetic and neurological information such as finger-tip forces and EMG for several representative (the most commonly used) grasp movements to explore their force and muscle activation patterns based on the newly defined grasp taxonomy. Ten able-bodied (five males, five females) volunteered to participate and they performed five different grasp tasks: holding a bottle (Bottle), turning a doorknob (Knob), cutting with a knife (Knife), brushing with a toothbrush (Toothbrush), holding a thick book (Book) after we attached five force sensitive resistor (FSR) sensors on the tip of fingers and four surface electromyogram (sEMG) electrodes on the lower arm of the subject’s dominant hand. Root Mean Square (RMS) and Mean Absolute Value (MAV) from the mean maximum values of sEMG(%) and fingertip force(kgf) of all ten subjects were extracted as features. The classification from the feature dataset using convolutional neural network (CNN) was applied and analyzed the results of accuracy and repeatability. The mean maximum values of EMG and fingertip forces during five different grasp tasks, and the MAV and RMS which were extracted features from the above were compared with task pairs. They showed significant differences in comparison of four pairs of tasks which were Bottle and Knife (p = 0.005 in both MAV and RMS), Bottle and Toothbrush (p = 0.005in both MAV and RMS), Bottle and Book (p = 0.013 in both MAV and RMS), Knob and Toothbrush (p = 0.047 in MAV and p = 0.028 in RMS). The classification accuracy of the Bottle grasp task was the largest at 60% (true positive predictive rate is 60% and false postive rate is 40%), while the other tasks showed an 30-40% of accuracy. Repeatability was 60% in the Bottle task and 50% in the Knob task, and those of the other tasks were ranged 30-40%. Overall, it is believed that the small number of samples in the study is the main reason of the low accuracy and repeatability of the classification. A total of nine variables (four sEMG and five forces) showed different significances in paired mean comparisons for five grasp tasks (graspping a bottle, turning a doorknob, cutting with a knife, brushing teeth with a toothbrush, holding a thick book). A comparison of the reduced variable from feature extraction also showed different classification accuracy for five grasp tasks.
주차 시간 단축 및 정확도 향상을 위한 카메라 모듈 보조장치의 구조화 성능 향상 방안
이민구(Mingu LEE),박주현(Juhyun Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Around view Monitor is the system for helping driver find exact position while parking the car, reflecting visual aspects from four-outside cameras around the vehicle. Front and rear, left and right, there are two couples of distinguished cameras settled in order to reveal the obstacles outside the vehicle. The object appeared around the vehicle is captured artificially as if we look around the vehicle in the view above it, like in the sky, in real-time. Problem occurred on the angle of camera on the present monitoring system, which is determined and distinguished according to length and width of each vehicle model. Several vernacular approaches for deciding angles of monitoring camera were in common. Because of physical volume of each vehicle, four-point camera setting was customized only for the only model of the vehicle. Instead, a size-oriented approach for automatic deciding angles of camera is presented in this paper. This approach calls for the determination of available angle configurations and calibrations, which is based on the link and joint coordinate systems and robot arm mechanism. These adjustments are presented in two accurate mathematical ways to permit the production of mounting construction indicators and their relative motion equations. The construction indicators, (representing adaptive lengths and angles of settlement links) are configured by factory setup for the purpose of jointing four cameras for monitoring. This paper describes on the calculation of a simplified three-dimensional mathematical model of vehicle cameraattachments for the purpose of developing real-time parking guide system, and applying the parking environment to several different characteristics of vehicle models. Several vehicle models include three fixed scales which are representing the car-length, car-width, and height of cameras. Determination of positions of the four cameras can be presented in the form of matrix calculation of kinematics and motion variables as well as angle-sequenced graphics in the modeling of ghost view frames of the occupant configuration within the vehicle exterior system.
Equilibrium Inferences from the Choice of Forum: Two-audience Case
Juhyun Park 서울대학교 경제연구소 1993 Seoul journal of economics Vol.6 No.3
This paper studies a signalling model with two audiences. In which the relationship between the sender and one audience is reverse to that of the sender and the other audience. When the sender chooses a forum after observing his type, the receivers make inferences about the sender's type not only from the message but also from the choice of forum; this influences the equilibrium. We present two models and analyze .the equilibrium, which differ in whether the sender can commit the choice of communication or not.
Changing Trends in Sexual Debut Age in the Korean Internet Sexuality Survey
Park Juhyun,Park Sang Hyun,Lee Soo Jin,Song Won Hoon,Choi Woo Suk,Cho Min Chul,Son Hwancheol 대한남성과학회 2022 The World Journal of Men's Health Vol.40 No.3
Purpose: To evaluate changing trends in relation to the sexual debut age and socioeconomic status (SES) in Korea. Materials and Methods: The Korean Internet Sexuality Survey (KISS) was conducted for in 2004, 2006, 2014, and 2016. We sent emails and surveyed people registered at an Internet survey agency. To determine the changing trends in sexual debut age, we collected and compared the responses of females in their 20s in 2004 (n=253) and 2014 (n=131) and collected and compared the responses of males in their 20s in 2006 (n=87) and 2016 (n=200). Results: In females, SES factors such as occupation, income, and academic background were not related to early sexual debut age. In the 2006 male study, early sexual debut age was associated with occupation, income, and academic background. However, in the 2016 male study, participants’ academic background was the only significant factor about early sexual debut age. In both the male and female studies, early sexual debut age was related to a higher number of sexual partners in life. Also, in both female cohorts (2004 and 2014), the number of pregnancies and the incidents of sexual abuse experienced were higher in the early sexual debut groups. Conclusions: Factors influencing early sexual debut were different in time and between men and women. And there was no significant association between SES factors and early sexual debut age in women. However, early sexual debut caused multiple problems, especially in young women. Thus, we need to create some suitable strategies to address these problems.
Effect of ozone concentration on atomic layer deposited tin oxide
Park, Hyunwoo,Park, Joohyun,Shin, Seokyoon,Ham, Giyul,Choi, Hyeongsu,Lee, Seungjin,Lee, Namgue,Kwon, Sejin,Bang, Minwook,Lee, Juhyun,Kim, Bumsik,Jeon, Hyeongtag American Institute of Physics 2018 Journal of Vacuum Science & Technology. A Vol.36 No.5