• Title/Summary/Keyword: body protection

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APPLICATION OF WHOLE BODY COUNTER TO NEUTRON DOSE ASSESSMENT IN CRITICALITY ACCIDENTS

  • Kurihara, O.;Tsujimura, N.;Takasaki, K.;Momose, T.;Maruo, Y.
    • Journal of Radiation Protection and Research
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    • v.26 no.3
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    • pp.249-253
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    • 2001
  • Neutron dose assessment in criticality accidents using Whole Body Counter (WBC) was proved to be an effective method as rapid neutron dose estimation at the JCO criticality accident in Tokai-mura. The 1.36MeV gamma-ray of $^{24}Na$ in a body can be detected easily by a germanium detector. The Minimum Detectable Activity (MDA) of $^{24}Na$ is approximately 50Bq for 10miniute measurement by the germanium-type whole body counter at JNC Tokai Works. Neutron energy spectra at the typical shielding conditions in criticality accidents were calculated and the conversion factor, whole body activity-to-organ mass weighted neutron absorbed dose, corresponding to each condition were determined. The conversion factor for uncollied fission spectrum is 7.7 $[(Bq^{24}Na/g^{23}Na)/mGy]$.

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A Study on GCNMOS-based ESD Protection Circuit Using Floating-Body Technique With Low Trigger Voltage (Floating-Body기술을 이용한 낮은 트리거 전압을 갖는 GCNMOS 기반의 ESD 보호회로에 관한 연구)

  • Jeong, Jun-Mo
    • Journal of IKEEE
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    • v.21 no.2
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    • pp.150-153
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    • 2017
  • In this paper, a structure of GCNMOS based ESD protection circuit using floating-body technique is proposed. TCAD simulation of Synopsys was used to compare with the conventional GGNMOS and GCNMOS. Compared with the conventional GCNMOS, the proposed ESD protection circuit has lower trigger voltage and faster turn-on-time than conventional circuit because of the added NMOSFET. In the simulation result, the triggering voltage of the proposed ESD protection circuit is 4.86V and the turn-on-time is 1.47ns.

A study on approach thesis of protection martial arts (경호기법에 입각한 경호무도의 학문적 접근)

  • Park, Jun-Seok
    • Korean Security Journal
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    • no.6
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    • pp.103-122
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    • 2003
  • Protection sciences are new science. therefore, protection martial arts sciences are will studied be based on study of protection in order to supply high level by request. Moreover, It is reconstruction that protection martial arts masters education, systematic manage, certificate system, protection martial arts recognition certificate, protection martial arts equipment, practice of protection martial arts. Protection martial arts occurs on the unforeseen accident and body guarding, therefore martial arts concept of protection martial arts different general martial arts and sport. In order to develope of protection martial arts First, scientific thesis need of protection martial arts learning. Especially, aims of present protection martial arts is not protect oneself, protect the VIP to safely from all dangers is different thing with aims of general martial arts. Instinct that VIP protect rather than oneself should study and develop. Second, techniques and model of protection martial arts spread to who in connection with security service by systematic and organized. Preferentially, study of protection martial arts Techniques and model possible the protection martial arts learned society, found laboratory and endowed protection martial arts society organize and prevention for random of protection martial arts and must make the original protection martial arts. Third, protection martial arts official certificate and license system must organize in order to training and manage of protection martial art master, Match director(First Second), life physical director(First, Second, Third) is systematically manage by Ministry of Culture & Tourism Republic of Korea. Like this protection martial arts also classify the certificate by scholarship and experience. Fourth, In union to university, private security service company, public institution, police and system that possible leaning to protection martial arts certificate course important. In addition, destroy the commercial character of present martial arts and cultivate the pure martial arts mind, should develop to martial arts in order to improve the humanism and temperament of right body guard.

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SHRINKAGE OF VITREOUS BODY CAUSED BY HYDROXYL RADICAL

  • Park, Myoung-Joo;Shimada, Takashi;Matuo, Yoichirou;Akiyama, Yoko;Izumi, Yoshinobu;Nishijima, Shigehiro
    • Journal of Radiation Protection and Research
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    • v.33 no.4
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    • pp.143-150
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    • 2008
  • In this study, we examined the effect of hydroxyl radical generated by $\gamma$-ray and UV irradiation on shrinkage of vitreous body. Change in gel ratio of vitreous body and change in the properties of its components (collagen, sodium hyaluronate) were analyzed. By comparing these results, the amount of hydroxyl radical, which induces the considerable shrinkage of vitreous body, was evaluated from theoretical calculation based on experimental condition and some reported kinetic parameters. It was concluded that the integrated amount of hydroxyl radical required to liquefy half of the vitreous body (Vitreous body gel ratio = 50%) was estimated as $140\;{\mu}molg^{-1}$ from $\gamma$-ray irradiation experiment. Also, from UV irradiation experiment result, it was confirmed that the effect of hydroxyl radical is larger than that of other reactive species. The causes of shrinkage of vitreous body are supposed as follows, 1) decrease in viscosity by cleavage of glycoside bond in sodium hyaluronate, 2) leaching of collagen from vitreous body and 3) leaching of crosslinked products and scission products of collagen.

A preliminary evaluation of the implementation of a radiation protection program for the lens of the eye in Korean nuclear power plants

  • Kong, Tae Young;Kim, Si Young;Cho, Moonhyung;Jung, Yoonhee;Son, Jung Kwon;Jang, Han;Kim, Hee Geun
    • Nuclear Engineering and Technology
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    • v.53 no.9
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    • pp.3035-3043
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    • 2021
  • Epidemiological research has revealed that radiation exposure can cause cataracts. The Korean nuclear regulatory body has proposed the reduction of the occupational dose limit for the lens of the eye from 150 mSv/y to 100 mSv/5y, with an additional limitation of not exceeding 50 mSv/y for a specific year, taking into account the recommendations of the International Commission on Radiological Protection, and the International Atomic Energy Agency. This means that radiation workers should receive the same level of radiation safety for the lens of the eye as for whole-body protection. Korean nuclear power plants (NPPs) are conducting research to establish the radiation protection program for the lens of the eye. In terms of the preliminary results of the implementation of the radiation protection program for the lens of the eye dedicated to Korean NPPs, this review article summarizes the current state of understanding of the regulations, technical guidance, eye lens dosimeters, and radiation field conditions resulting in lens dose.

Analysis on Electric Shock Current in DC Electricity (직류환경에서 인체에 흐르는 감전전류 분석)

  • Lee, Jin-Sung;Kim, Hyosung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.3
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    • pp.254-259
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    • 2016
  • Recently, DC distribution systems have become a hot issue because of the increase in digital loads and DC generation systems according to the expansion of renewable energy technologies. To obtain the practical usage of DC electricity, safety should be guaranteed. The main concerns for safety are twofold: one side is human protection against electric shocks, and the other is facility protection from short faults. "Effects of current on human beings and livestock" (IEC 60479) defines a human body impedance model in electric shock conditions that consists of resistive components and capacitive components. Although the human body impedance model properly works in AC electricity, it does not well match with the electric shock behavior in DC electricity. In this study, the contradiction of the human body impedance model defined by IEC 60479 in case of DC electricity is shown through experiments for the human body. From the analysis of experimental results, a novel unified human body impedance model in electric shock conditions is proposed. This model consists of resistive components, capacitive components, and an inductance component. The proposed human impedance model matches well for AC and DC electricity environments in simulation and experiment.

Agricultural Safety Clothing: Implications for Making and Selecting Clothes

  • Chun, Jong-Suk;Jee, Jung-Woo;Hwang, Kyoung-Sook
    • Journal of the Ergonomics Society of Korea
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    • v.30 no.4
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    • pp.509-515
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    • 2011
  • Objective: The study was performed to suggest factors to consider when making or selecting protective clothing to enhance farmers' health. The purpose of this study was to review and summarize the agricultural safety technology on clothing including hat, gloves, and shoes. Background: The farmers' work clothing has to meet a multitude of requirement. Risk factors in farm-work were identified by previous researches. Agricultural safety clothing needs to be introduced. Method: We reviewed previous papers regarding the agricultural workers' health, safety clothing to protect body from excessive heat and humid environment, ultraviolet(UV) protection, and hazardous body working postures. Also the UV cut effect, pesticideproof clothing, and preventable farm work related musculoskeletal disorders were discussed. Results: The agricultural safety clothing needs to be developed to provide comfort and to be resistant against heat. The UV protection function on skin and eyes has not been fully researched in safety clothing studies yet. Conclusions and Application: The farmers' work-related body posture needs to be studied in order to make and design agricultural safety clothing. The safety issues on agricultural work shoes are also needed to be included in future studies.

Application of the Detection of External Contamination on Radiation Workers for Bed Type Whole Body Counting Using Monte Carlo Method (몬테카를로 방법을 적용한 bed type 전신계측기의 방사선작업종사자 외부오염 검출 응용)

  • Kim, Jeong-In;Lee, Byoung-Il
    • Journal of Radiation Protection and Research
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    • v.38 no.4
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    • pp.242-245
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    • 2013
  • Monte Carlo method was applied to discriminate the external contamination on radiation workers in nuclear power plants for internal dose assessment generally used with a bed type scanning detector whole body counter. Korean voxel model with internal contamination was used to estimate the detection patterns of whole body scanning. Also, the BOMAB model with various external contamination was assumed to compare with detection of radionuclides inside the human body. From the comparison of detection efficiency between front and back side up, external contamination was easily distinguished.

Korean Patent Application Trend of Posture Correction Product Design Technology (자세 교정 제품 설계 기술의 한국 특허 출원 경향)

  • Kim, Minsun;Chun, Jongsuk
    • Fashion & Textile Research Journal
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    • v.22 no.4
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    • pp.407-412
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    • 2020
  • This study investigated the technological development of Korean functional product design for posture correction. We analyzed registered and disclosed Korean patents (n=289) of KIPRIS. They were posture correction technology patents filed from 1999 to 2018. Keywords used in patent selection were posture correction, posture correction clothing, posture correction band, rehabilitation clothing, joint protection, protective equipment, and compression wear. These were then analyzed by patent application year, product type, effect pursued, and posture correction body part. The results showed that patent applications related to posture correction technology have increased since 2014. Products subject to patents for posture correction technology were device/brace (59.5%), footwear (22.5%), and clothing (18.0%). Patents for posture correction pursued various wearing effects. The effects pursued were dependent on the product type. The device/brace focused on joint protection (76.7%) and muscle reinforcement (40.7%). Footwear was focused on joint protection (90.8%). The clothes were focused on muscle reinforcement (50.0%) and body shaping (36.5%). The clothing and device/brace for posture correction were worn on various body parts of the upper limbs to feet. The posture correction product design patent was to correct various body parts. Patents pursuing upper body correction focused on spine posture correction (n=99). Patents for foot posture correction have steadily increased (n=102). Patents for posture correction of the pelvis and hip joints were relatively few (n=46). The results of this study implied the necessity to develop technology to correct posture by combining the functions of device/brace and clothing.

Structure Optimization of ESD Diodes for Input Protection of CMOS RF ICs

  • Choi, Jin-Young
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.17 no.3
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    • pp.401-410
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    • 2017
  • In this work, we show that the excessive lattice heating problem due to parasitic pnp transistor action in the diode electrostatic discharge (ESD) protection device in the diode input protection circuit, which is favorably used in CMOS RF ICs, can be solved by adopting a symmetrical cathode structure. To explain how the recipe works, we construct an equivalent circuit for input human-body model (HBM) test environment of a CMOS chip equipped with the diode protection circuit, and execute mixed-mode transient simulations utilizing a 2-dimensional device simulator. We attempt an in-depth comparison study by varying device structures to suggest valuable design guidelines in designing the protection diodes connected to the $V_{DD}$ and $V_{SS}$ buses. Even though this work is based on mixed-mode simulations utilizing device and circuit simulators, the analysis given in this work clearly explain the mechanism involved, which cannot be done by measurements.