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광주지역 어린이 놀이시설 마감재의 중금속 노출에 의한 인체 위해성평가
윤상훈,김소영,조은,남태희,박진환,공화진,이기원,서광엽,박정훈,민경우 한국환경보건학회 2024 한국환경보건학회지 Vol.50 No.2
Background: Children who use playground facilities are exposed to potential risks due to the high concentration of heavy metals contained in the finishing materials of facilities in children's playgrounds. Objectives: The purpose of this study was to investigate the concentration of heavy metals in the finishing materials of outdoor children's playgrounds where harmful heavy metals exist in Gwangju and to conduct human risk assessment for children and adults by age to find the risks and limitations. Methods: The bottom and top layers of double-painted paint were peeled off and collected together from the finishing materials of children's play facilities such as slides, swings, and seesaws in 147 children's parks in Gwangju. Heavy metals were analyzed using ICP-OES, etc., and human risk assessment was performed using the concentrations of heavy metals. Results: Based on 1.0E-04, which requires legal regulation, CTE was found to pose a carcinogenic risk for preschool children and no carcinogenic risk for the rest of the age groups. However, RME showed that both men and women of all ages had a carcinogenic risk. For reference, when the carcinogenic risk was based on 1.0E-06, CTE was found to pose a carcinogenic risk from infants to elementary school students, and RME was found to have a carcinogenic risk in all age groups. It was judged that there is a non-carcinogenic risk if the non-carcinogenic risk exceeds 1 based on the hazard index (HI) 1. In CTE, there was no non-carcinogenic risk, and RME for preschooler males (1.49E+00) and females (1.56E+00) were found to have non-carcinogenic risk. Conclusions: This study was meaningful in that it examines the differences in the current management of heavy metals concentration standards and potential carcinogenic and non-carcinogenic risks to the human body and discusses the relationship between heavy metals and human health effects.
무선 센서 네트워크에서 동적 클러스터 유지 관리 방법을 이용한 에너지 효율적인 주기적 데이터 수집
윤상훈,조행래,Yun, SangHun,Cho, Haengrae 대한임베디드공학회 2010 대한임베디드공학회논문지 Vol.5 No.4
Wireless sensor networks (WSNs) are used to collect various data in environment monitoring applications. A spatial clustering may reduce energy consumption of data collection by partitioning the WSN into a set of spatial clusters with similar sensing data. For each cluster, only a few sensor nodes (samplers) report their sensing data to a base station (BS). The BS may predict the missed data of non-samplers using the spatial correlations between sensor nodes. ASAP is a representative data collection algorithm using the spatial clustering. It periodically reconstructs the entire network into new clusters to accommodate to the change of spatial correlations, which results in high message overhead. In this paper, we propose a new data collection algorithm, name EPDC (Energy-efficient Periodic Data Collection). Unlike ASAP, EPDC identifies a specific cluster consisting of many dissimilar sensor nodes. Then it reconstructs only the cluster into subclusters each of which includes strongly correlated sensor nodes. EPDC also tries to reduce the message overhead by incorporating a judicious probabilistic model transfer method. We evaluate the performance of EPDC and ASAP using a simulation model. The experiment results show that the performance improvement of EPDC is up to 84% compared to ASAP.
윤상훈,정정화 대한전자공학회 2007 電子工學會論文誌-TC (Telecommunications) Vol.44 No.4
In this paper, we propose a new decoding method for differentially biorthogonal chirp spread spectrum (DBO-CSS). In DBO-CSS, the information is carried on the differential phase not between the adjacent sub-chirp symbols but between the sub-chirp symbols in the same position of adjacent full-chirp symbol. So, the conventional multiple symbol differential detection (MSDD) algorithms to enhance the BER performance can not be applied to the DBO-CSS directly. In this paper, we propose a new differential detection algorithm based on a partial MSD(multiple symbol detection) and a viterbi algorithm. It is shown that the performance gain of the proposed algorithm when compared with that of the conventional detection algorithm is around 2.5dB at BER = 10-5. 본 논문에서는 DBO-CSS를 위한 새로운 수신기 구조를 제안한다. DBO-CSS에서는 정보가 인접한 서브첩(sub-chirp)간의 차분 위상이 아니라 인접한 풀첩(full-chirp) 내의동일 위치에 있는 서브첩간의 차분위상에 실리게 된다. 따라서, DBO-CSS의 BER 성능 향상을 위해 일반적인 MSDD(multiple symbol differential detection) 알고리듬 등은 바로 적용할 수 없다. 본 논문에서는 부분적 MSD(multiple symbol detection)와 viterbi 알고리듬에 기반한 새로운 차분 검출 알고리듬을 제안한다. 실험결과, 제안하는 구조는 기존의 차분 검출 방식과 biorthogonal 복호기로 구성된 수신기에 비해 BER=10-5일 때 약 2.5dB의 SNR이 향상됨을 확인하였다.
진공 열 플라즈마 용사공정을 통한 NiTiZrSiSn 벌크 비정질 코팅 형성
윤상훈,김준섭,김수기,이창희,Yoon, Sang-Hoon,Kim, June-Seob,Kim, Soo-Ki,Lee, Chang-Hee 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.4
An inert gas atomized NiTiZrSiSn bulk metallic glass feedstock was sprayed onto the copper plate using vacuum plasma spraying process. In order to change the in-flight particle energy, that is, thermal energy, the hydrogen gas flow rate in plasma gas mixture was increased at the constant flow rate of argon gas. Coating and single pass spraying bead were produced with the least feeding rate. Regardless of the plasma gas composition, fully melted through unmelted particle could be observed on the overlay coating. However, the frequency of the unmelted particle number density was increased with the decrease of the hydrogen gas flow rate. The amorphous phase fraction within coating was also affected by the number density of the unmelted particle.
한약재 함유 소화효소제품 복용에 대한 소비자들의 체험에 관한 질적 연구
윤상훈,임정태,윤영희,최예용,이은지,박종승,정문주 대한한방내과학회 2020 大韓韓方內科學會誌 Vol.41 No.1
Objectives: The aim of this study was to analyze consumer experience with Digestive Enzymes, a digestive enzyme product that includes medicinal herbs (Multi-Zyme®). The goal was to provide basic data on improvements and marketability of future digestive enzyme products containing medicinal herbs. Methods: Qualitative research was conducted to explore the current participants’ experience. In-depth interviews with a semi-structured interview guide were conducted to investigate the experience and perception of the participants. The participants were recruited using snowball sampling and purposive sampling, and a qualitative content analysis method was adopted. Credibility was ensured by adopting a member check, triangulation, and peer debriefing method. Results: In-depth interviews were completed with a total of 8 participants. The collected data were classified into 16 codes and then further divided into the following seven categories: direct buying, indirect buying, effects, questions, recommendations, positive perception, and negative perception. The categories were grouped into three themes: ‘Experience of purchasing existing health foods', ‘Experience of taking Multi-Zyme', and ‘Opinions on selling Multi-Zyme at Korean medicine clinics'. Conclusion: The participants experienced effect of the Multi-Zyme® and were willing to recommend it around. However, the Korean medicine doctors need to inform consumers about the dose and duration when taking Multi-Zyme® to prevent abuse. Some consumers may trust Multi-Zyme® sales from Korean medicine clinics, but some held opinions that those sales were not trustworthy, so promotion and improvement are needed.