• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.16 no.4
• /
• pp.108-116
• /
• 2002

This paper presents the measurements and evaluation of voltage waveforms due to human electrostatic discharge(ESD). The principle of operation and design rule of a new device for measuring the ESD fast transient voltages with very fast rise time were described. Peak values and rise time of ESD voltages derived from a charged human body under a variety of experimental conditions were examined. The frequency bandwidth of the proposed voltage measuring system ranges from DC to 400[㎒]. The ESD voltage waveform is nearly equal to the ESD current waveform and the peak amplitude of ESD current waveform is roughly proportional to the ESD voltage in each experimental conditions. A rapid approach results in a discharge voltage with a faster initial rise time than for a slow approach. The voltages caused by direct finger ESDs have an initial slope with a relatively long, 10∼30[ns] rise time, but the amplitude is small. On the other hand, the voltages caused by direct hand/metal ESDs have a steep initial s1ope with 1 ∼3[ns] rise time, but an initial spike is very big. As a consequence, it was found that the ESD voltage and current waveforms strongly depend on the approach speed and material of intruder. These measurement results would be useful to design the ESD protective devices.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.32 no.6
• /
• pp.959-967
• /
• 2008

The body measurement ratios and indices used in this study are all 3D female measurement data of the two countries were obtained from Size Korea Project and SizeUSA Project. The purpose of the study is to compare and analyze body measurement data between two countries. The results of this research are helpful for the clothing manufacturer and company to trade with America. The samples were 1,988 Korean and 6,306 American females. Thirty-five body measurement ratios and indices were chosen as the principal measurements in making garments. The conclusion of this research was as follow; First, U.S. females have measurements that exceed Korean women, except for crotch length total and shoulder slope. Second, the correlation coefficients of height and weight are relatively higher than other measurements in the two countries' body measurements. Finally, American women's height ratios are significantly bigger than Korean women's in most height ratios. On the other hand, Korean are significantly bigger than American in weight ratios. The drop values of Korean females are also smaller than those of American. It was recognized that American women are much bigger, wider and more obese than Korean according to the results by utilizing the girth ratios. BMI, Rohrer and Vervaeck index.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.10
• /
• pp.1393-1401
• /
• 2010

In this experimental study, we have examined the correlation between a human carpal motion and a surface electromyogram. The carpal motion patterns have been identified and the main muscles involved in the carpal motion have been determined by investigating the anatomical structure of a carpal. The torque acting against the carpal motion has been applied by using a device for carpal rehabilitation training, and the surface electromyogram signal corresponding to the torque at the main muscles has been measured. The root-mean-square (RMS) magnitude of the surface electromyogram signal has been calculated and used to analyze the correlation between the surface electromyogram signal and carpal motion. The experimental results have proved that for carpal torque values below $0.1\;N{\cdot}m$, the RMS magnitude of the surface electromyogram signal is linearly proportional to the carpal torque magnitude and that the carpal torque magnitude is linearly proportional to the cross-sectional area of the carpal muscles. Further, the analysis of the contribution of each muscle to the carpal motion has shown that the contribution of the most dominant muscle is consistently 60%. These three results can be applied to develop more sophisticated devices or robots for carpal rehabilitation training.

• The Journal of Internal Korean Medicine
• /
• v.21 no.1
• /
• pp.13-22
• /
• 2000

목적 : 본(本) 연구(硏究)는 배기음(排氣飮)이 인간(人間)의 장관내(腸管內)에서 산화물(酸化物)에 의해 유발(誘發)된 세포(細胞)의 사망(死亡) 및 DNA의 손상(損傷)을 방지할수 있는지를 검증(檢證)하기 위한 실험(實驗)이다. 방법 : 배양(培養)된 인체장관(人體腸管) 세포계열(細胞系列)인 Caco-2 세포(細胞)에서 세포(細胞)의 사망(死亡)은 trypan bile의 소실정도에 의해서 평가했으며, DNA의 손상(損傷)은 double stranded DNA의 파괴정도를 측정하여 평가하였다. $H_2O_2$는 표본(標本) 산화제(酸化劑)로 사용되었다. 결과 : $H_2O_2$에 노출된 세포들의 세포사망(細胞死亡) 정도는 노출시간과 용량에 비례하여 증가하는 양상을 보였다. 배기음(排氣飮)은 $H_2O_2$에 의해 유발(誘發)되는 세포방지를 방지하였고, 0.05-1%의 농도범위에 걸쳐서는 그 효과가 용량에 비례하여 증가하는 양상을 보였다. $H_2O_2$에 의해 유발(誘發)된 세포손상(細胞損傷)은 catalase(hydrogen peroxide scavenger enzyme)와 deferoxamine(iron chelator)에 의해 억제되었다. 그러나 강력한 항산화제(抗酸化劑)인 DPPD는 $H_2O_2$에 의해 유발(誘發)되는 세포손상(細胞損傷)에는 영향을 주지 못했다. $H_2O_2$에 의해 유발(誘發)된 지질(脂質)의 과산화(過酸化)는 배기음(排氣飮)과 DPPD에 의해 억제되었다. $H_2O_2$에 의해 유발(誘發)된 DNA의 손상(損傷)은 배기음(排氣飮)에 의해 방지되었으며 용량에 의존하는 양상을 보였다. $H_2O_2$에 의해 유발(誘發)된 DNA의 손상은 catalase와 deferoxamine에 의해 억제되었지만 DPPD는 억제시키지 못했다. 배기음(排氣飮)은 $H_2O_2$에 의해 유발(誘發)된 ATP의 소실을 회복시켰다. 이러한 실험결과 $H_2O_2$에 의해 유발(誘發)된 세포(細胞)의 손상(損傷)은 지질(脂質)의 과산화(過酸化)와는 다른 독립적인 기전에 의해 일어남을 나타낸다. 결론 : 이러한 결과들로 볼 때 Caco-2 세포(細胞)에서 배기음(排氣飮)이 항산화작용(亢酸化作用)보다는 다른 기전을 통하여 Caco-2 세포안에서 산화제(酸化劑)에 의해 유발(誘發)된 세포(細胞)의 사망(死亡)와 DNA의 손상(損傷)을 방지할 수 있다는 것을 가리킨다. 따라서 본 연구(硏究)는 배기음(排氣飮)이 반응성산소기(反應性酸素基)에 의해 매개된 인체(人體) 위장관질환(胃腸管疾患)의 치료(治療)에 사용할 수 있을 가능성(可能性)이 있음을 제시하고 있다.

• The Journal of the Korea Contents Association
• /
• v.22 no.1
• /
• pp.162-171
• /
• 2022

According to <2020 Industry character white paper> No.1 character products are toys, which are 58%, and every year. the Art-toy development is receiving attention. Because of this situation, the Art-toy market is growing, and the number of Art-toy artists and companies is also rising. As the Art-toy markets are growing variety of Art-toy needs to be created, and also need to analyze and researched about Art-toy. The Art-toy is primarily personified and is created based on a human proportion body figure. The research conducted a case analysis of Art-toys and a preference survey for general adult men and women through the head-to-head ratio, which is a measurement standard for human proportions. As a result, The Art-toy has an ideal shape ratio and crafting area according to the body ratio. As preference research from men and women, men show seven heads life-sized and women appeared to three heads life-sized figures are most popular. The two and three heads life-sized have a high preference, and the Art-toy case had a relationship. As the Art-toy case and research of preference help to develop the Art-toy design, and following this research will be used as basic data when creating or researching about the Art-toy in the future.

• Journal of Biomedical Engineering Research
• /
• v.20 no.3
• /
• pp.315-321
• /
• 1999

The purpose of this study is to develop a mathematical model for system identification in order to predIct muscle force based on eledromyographic signal. Therefore, a finding of the relalionship between characteristics of electromyographic signal and the corre spondng muscle force should be necessiiry through dynamic, joint model. To develop the dynamic joint model, the upper limb mcludmg the wrist and elbow joint has been considered. The kinematic and dynamic data, such as joint angular displacement, velocity, deceleration along with the moment of inertla, required to establish the dynamic model has been obtained by electrical flexible goniometer which has two degree-of-frcedoms. ln this model, muscle force can be predicted only electromyographs through the relationship between the integrated lorce and the mtegrated electromyographic signal over the duration of muscle contraclion in this study.

• Biomedical Science Letters
• /
• v.2 no.2
• /
• pp.153-158
• /
• 1996

Verapamil, a potent calcium channel blocker, has been proved to be one of the modulators to overcome drug resistance in cancer chemotherapy. In the present experiment, the possibility of verapamil as a MDR modulator was investigated by using MTT assay. Sole treatment of verapamil on the HeLa and Caski cervical cancer cell line revealed dose dependent cytotoxicity within a range of tested dose. Combined treatment of verapamil with 5-FU, DDP on two human cervical cancer cell line led to a significant synergistic cytotoxicity. Therefore , these studies showed that verapamil had a possibility to be applicable to cancer chemotherapy in gynecological oncology.

• The KIPS Transactions:PartB
• /
• v.19B no.2
• /
• pp.127-134
• /
• 2012

Video digital door lock(VDDL) system detects people who access to the door and acquires the human image. Design considerations is that current consumption must be minimized by applying fast human detection algorithm because of battery-based operation. Since the digital door lock takes an image through a fixed camera, detection of a person based on background image leads to high degree of reliability. This paper deals with a single human detection algorithm suitable for VDDL with fulfilling these requirements such that it detects a moving object in an image, then identifies whether the object is a person or not using image processing. The proposed image processing algorithm consists of two steps: Firstly, it detects the human image region using both background image and skin color information. Secondly, it identifies the person using polar histogram based on proportional information of human body. Proposed algorithm is implemented in VDDL and is verified the performance through experiments.

• Fashion & Textile Research Journal
• /
• v.12 no.4
• /
• pp.487-493
• /
• 2010

The objectives of this study were to investigate the progress of obesity in women from childhood to adulthood and to analyze the characteristics of obese figures through comparing their body proportions to normal-weight people, to provide a basic reference for development of new size categories and improved pattern grading. Body measurement was made on 6,704 women age between 7-39 in Sizekorea 2004 database. The age range was divided into three groups: children(7-12), teenagers(13-18) and adults(19-39). The result of research into the characteristics of body proportions of obese figures and the classification of different figure groups of obese people are as follows: The ratio between width and circumference for each part of the body was investigated according to body weight which was grouped into three different weights of low, normal and obese body weights. And the result demonstrated that in all the ranges of age, the obese groups had the lowest ratio between width and circumference, having a thick body shape. And according to the result of comparing the ratio of the circumference of each body part divided by the waist circumference, the obese group also showed a low ratio, indicating that they have bigger waist circumference than any other body parts. By analyzing the ratio of circumference of body parts divided by waist circumference, three factors were identified as contributing to obesity. Using the factor loadings of the upper, distal and lower body obesity, a cluster analysis was carried out and three different categories of obesity were defined; abdominal obesity, distal obesity and proximal obesity.

• Journal of The Korean Ophthalmological Society
• /
• v.59 no.11
• /
• pp.1056-1061
• /
• 2018

Purpose: To investigate the effects of valproic acid on the survival of cultured human Tenon's capsule fibroblasts (HTFBs). Methods: Primary cultured HTFBs were exposed to 0, 0.25, 0.5, and 1.0 mM valproic acid with or without 0, 1.0, $2.5{\mu}g/mL$ mitomycin C, and incubated for 5 days. Cell survival was assessed using an MTT (3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide) assay and the degree of apoptosis was assessed by flow cytometry using annexin-V/propidium iodide double staining. Results: Valproic acid decreased the survival of HTFBs in a dose-dependent manner, and survival was further decreased by adding mitomycin C to valproic acid. Both valproic acid and mitomycin C induced apoptosis of HTFBs. Valproic acid induced less apoptosis than mitomycin C. Conclusions: Valproic acid decreased the cellular survival of HTFBs and induced apoptosis. The antiproliferative effects of valproic acid were further enhanced by the addition of mitomycin C.