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.

Robust stability analysis for Lur’e systems with interval time-varying delays via Wirtinger-based inequality

Park, Myeongjin,Kwon, Ohmin,Park, Juhyun,Lee, Sangmoon,Cha, Eunjong Springer (Biomed Central Ltd.) 2014 Advances in Difference Equations Vol. No.

The US-DPRK Peace Treaty: A Commentary

Juhyun Park 이준국제법연구원 2023 Journal of East Asia and International Law Vol.16 No.1

This Commentary provides a detailed analysis of the US-DPRK Peace Treaty, a proposed bilateral peace treaty between the United States and the Democratic People’s Republic of Korea (i.e., North Korea). The US-DPRK Peace Treaty was conceived as the first in a series of legal instruments to be executed in furtherance of the establishment of “peace as a system” on the Korean Peninsula. In this monograph, the authors envision that such a peace treaty would serve as a basis for peaceful co-existence between the two countries and, ultimately, a peaceful, non-volatile situation on the Korean Peninsula. The Commentary offers an in-depth explanation of each provision of the US-DPRK Peace Treaty, including the meaning, background, rationale and legal implications of individual provisions of the Peace Treaty. Additionally, it provides insight into relevant international law issues and the history of negotiations and engagement among interested parties in the context of the inter-Korean conflict.

The Impact of Celebrity Suicide on Subsequent Suicide Rates in the General Population of Korea from 1990 to 2010

Park, Juhyun,Choi, Nari,Kim, Seog Ju,Kim, Soohyun,An, Hyonggin,Lee, Heon-Jeong,Lee, Yu Jin The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.4

<P>The association between celebrity suicide and subsequent increase in suicide rates among the general population has been suggested. Previous studies primarily focused on celebrity suicides in the 2000s. To better understand the association, this study examined the impacts of celebrity suicides on subsequent suicide rates using the data of Korean celebrity suicides between 1990 and 2010. Nine celebrity suicides were selected by an investigation of media reports of suicide deaths published in three major newspapers in Korea between 1990 and 2010. Suicide mortality data were obtained from the National Statistical Office of Korea. Seasonal autoregressive integrated moving average models with intervention analysis were used to test the impacts of celebrity suicides, controlling for seasonality. Six of the 9 celebrity suicides had significant impacts on suicide rates both in the total population and in the same gender- or the same age-subgroups. The incident that occurred in the 1990s had no significant impact on the overall suicide rates, whereas the majority of the incidents in the 2000s had significant influences for 30 or 60 days following each incident. The influence of celebrity suicide was shown to reach its peak following the suicide death of a renowned actress in 2008. The findings may suggest a link between media coverage and the impact of celebrity suicide. Future studies should focus more on the underlying processes and confounding factors that may contribute to the impact of celebrity suicide on subsequent suicide rates.</P>

Si–Mn/Reduced Graphene Oxide Nanocomposite Anodes with Enhanced Capacity and Stability for Lithium-Ion Batteries

Park, A Reum,Kim, Jung Sub,Kim, Kwang Su,Zhang, Kan,Park, Juhyun,Park, Jong Hyeok,Lee, Joong Kee,Yoo, Pil J. American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.3

<P>Although Si is a promising high-capacity anode material for Li-ion batteries (LIB), it suffers from capacity fading due to excessively large volumetric changes upon Li insertion. Nanocarbon materials have been used to enhance the cyclic stability of LIB anodes, but they have an inherently low specific capacity. To address these issues, we present a novel ternary nanocomposite of Si, Mn, and reduced graphene oxide (rGO) for LIB anodes, in which the Si–Mn alloy offers high capacity characteristics and embedded rGO nanosheets confer structural stability. Si–Mn/rGO ternary nanocomposites were synthesized by mechanical complexation and subsequent thermal reduction of mixtures of Si nanoparticles, MnO<SUB>2</SUB> nanorods, and rGO nanosheets. Resulting ternary nanocomposite anodes displayed a specific capacity of 600 mAh/g with ∼90% capacity retention after 50 cycles at a current density of 100 mA/g. The enhanced performance is attributed to facilitated Li-ion reactions with the MnSi alloy phase and the formation of a structurally reinforced electroconductive matrix of rGO nanosheets. The ternary nanocomposite design paradigm presented in this study can be exploited for the development of high-capacity and long-life anode materials for versatile LIB applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-3/am404608d/production/images/medium/am-2013-04608d_0008.gif'></P>

Comparison of Improving Effects for Diabetic Erectile Dysfunction according to the Anti-Glycemic Agents: Phlorizin and Insulin

Juhyun Park,Ohseong Kwon,Sung Yong Cho,Min Chul Cho,Jae-Seung Paick,Soo Woong Kim 대한남성과학회 2019 The World Journal of Men's Health Vol.37 No.2

Purpose: To compare the improving effects of diabetic erectile dysfunction with two anti-glycemic agents; phlorizin and insu-lin. Materials and Methods: Sixty Sprague-Dawley rats were divided into four groups (n=15 in each group): normal control (C), untreated diabetic rats (D), and diabetic rats treated by phlorizin (P) or insulin (I). Ten weeks after the diabetic induction using an injection of streptozotocin (55 mg/kg), four weeks of diabetic control was conducted. Erectile response, Western blot, and immunohistochemistry were assessed. Results: During the experiment, the C-group showed continuous weight gain, while the other groups suffered from weight loss. After start of diabetic control, the body weight of I-group was increased; whereas, there was no meaningful change in the P-group. Meanwhile, comparable blood glucose levels were achieved in the P- and I-groups. The erectile response was markedly decreased in the D-group, whereas the P- and I-groups were similar as good as the C-group. In addition, D-group showed the significant decrease in the cavernosal smooth muscle content and increased apoptosis. Platelet endothelial cell adhesion molecule-1 protein expression, phosphorylation of endothelial nitric oxide synthase and myosin phosphatase target subunit 1 were significantly distorted in the D-group, while the P- and I-groups were comparable with the C-group. Conclusions: Phlorizin treatment resulted in the improvement of erectile function as same as insulin despite the lack of ana-bolic weight gains. These results suggest that control of blood glucose level rather than a type of anti-glycemic agents is more important for the prevention and treatment of diabetic erectile dysfunction.

Controlled wavelength reduction in surface wrinkling of poly(dimethylsiloxane)

Park, Jeong-Yong,Chae, Hee Yeop,Chung, Chan-Hwa,Sim, Sang Jun,Park, Juhyun,Lee, Hong H.,Yoo, Pil J. Royal Society of Chemistry 2010 SOFT MATTER Vol.6 No.3

<P>In this paper, we report that the wavelength of a wrinkled PDMS structure decreases upon annealing by combinative treatments of ultraviolet/ozone irradiation and oxygen plasma (case I). The wavelength of wrinkles also decreases when the PDMS surface is subjected to repeated exposure to a short-period oxygen plasma (case II). As opposed to other studies in which the wrinkling wavelength grows with processing time or temperature, some notable characteristics of wavelength reduction are observed in this study. Two routes toward decreasing the wavelength are associated with two different conditions of the PDMS surface. The former can be ascribed to a strain increase during the post-annealing procedure on a viscoelastic intermediate layer and for the latter, on the other hand, the selective hardening of an elastic intermediate layer controls the wavelength reduction. Elemental depth profiles obtained from Auger electron spectroscopy and nano-indentation of the surface by atomic force microscopy are employed to confirm these explanations. We also find that an externally applied stress can cause secondary wrinkling on a global scale, leading to a hierarchical structure with two wavelength scales. The proposed experimental results provide a new means of tailoring the surface morphology of wrinkled structures on demand.</P> <P>Graphic Abstract</P><P>Novel means to manipulate the wrinkling characteristics of PDMS surface are presented. Post annealing after UVO/plasma treatment or repetitive short-period plasma treatments affects the mechanical properties of intermediate PDMS layer, whereby the wrinkling wavelength can be reduced. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b916603c'> </P>

A Study on Intelligent Video Security Surveillance System with Active Tracking Technology in Multiple Objects Environment

Juhyun Park,Jeonghun Choi,Myoungheum Park,Sukwon Hong,Hyomin Kim 보안공학연구지원센터 2012 International Journal of Security and Its Applicat Vol.6 No.2