Development of a Chest‑Belt‑Type Biosignal‑Monitoring Wearable Platform System

Joo‑Hyeon Lee,Hyun‑Seung Cho,Jin‑Hee Yang,Sang‑Min Kim,Jeong‑Whan Lee,Hwi‑Kuen Kwak,Je‑Wook Chae 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

The purpose of this study was to develop a wearable platform system that can detect and acquire a soldier’s biosignals (i.e., heart activity signal, respiration rate, etc.) in a nonrestrained, unconscious manner. These detected biosignals are transmitted to a processing device to analyze and monitor the soldier’s physical status. To achieve this, textile-based heart activity electrodes and a strain gauge sensor for the respiration signal measurement were developed, and their performances in detecting each signal were verifed. These sensors were embedded in a chest belt to design a wearable platform that can simultaneously measure heart activity and respiration signals. The sensor part of the chest belt has a dual layer structure to detect high-quality signals. Stretch fabric was used on the outer layer and a respiration sensor was attached to the belt. On the inside layer, a non-stretch fabric was used as the base fabric and a heart activity-sensing electrode, that is capable of taking measurements using a modifed lead-II heart activity signal induction method, was embroidered onto the fabric. Subjects were asked to wear the chest belt, and a biosignal processor module was attached to verify the system’s performance while simultaneously acquiring the heart activity and respiration signals. More specifcally, it was confrmed that the two signals were detected in a stable. It is expected that the biosignal-monitoring wearable platform system developed in this study will be able to efectively analyze and monitor soldiers’ biosignals.

Differential Manifestation of Ocular Phenotypes in TALEN-mediated p19arf Knockout FVB/N and C57BL/6J mouse lines

Jin‑Sung Park,Joo‑Il Kim,Hyun‑Jin Lim,Soo‑Kyung Ryu,Euna Kwon,Kang‑Min Han,Ki‑Taek Nam,Han‑Woong Lee,Byeong‑Cheol Kang 한국유전학회 2020 Genes & Genomics Vol.42 No.9

Background p19arf, primarily known as a tumor suppressor, has also been reported to play an essential role in normal development of mouse eyes. Consistently, lack of p19arf has been associated with ocular defects, but the mixed background of the knockout (KO) mouse strain used raised a concern on the accuracy of the phenotypes observed in association with the targeted gene due to genetic heterogeneity. Object We carried out a study to investigate into the efect of genetic background on the manifestation of p19arf KO associated phenotypes. Methods We characterized the phenotypes of novel p19arf KO mouse lines generated in FVB/N and C57BL/6J using a transcription activator-like efector nuclease (TALEN) system in comparison to the reported phenotypes of three other p19arf-defcient mouse lines generated using homologous recombination. Results Ninety-fve percent of FVB/N-p19arf KO mice showed ocular opacity from week 4 after birth which worsened rapidly until week 6, while such abnormality was absent in C57BL/6J-p19arf KO mice up to the age of 26 weeks. Histopathological analysis revealed retrolental masses and dysplasia in the retinal layer in FVB/N-p19arf KO mice from week 4. Besides these, both strains developed normally from birth to week 26 without increased tumorigenesis except for a subcutaneous tumor found in a C57BL/6J-p19arf KO mouse. Conclusion Our fndings demonstrated surprisingly variable manifestation of p19arf-linked phenotypes between FVB/N and C57BL/6J mice, and furthermore between our mouse lines and the established lines, indicating a critical impact of genetic background on functional study of genes using gene targeting strategies in mice.

Effect of polydopamine‑modified reduced graphene oxides on the catalytic activity of Pt nanoparticles catalysts for fuel cell electrodes

Joo‑Hyoeng Woo,Soo‑Jin Park,Sungwook Chung,Seok Kim 한국탄소학회 2019 Carbon Letters Vol.29 No.1

We have studied a method to prepare polydopamine-modified reduced graphene oxide-supported Pt nanoparticles (Pt– PDA–RGO). The Pt–PDA–RGO nanocomposites were synthesized by a wet-coating process, which was induced by selfpolymerization of dopamine. As an eco-friendly and versatile adhesive source in nature, dopamine could be easily adhered to surfaces of organic material and inorganic material via polymerization processes and spontaneous adsorption under weak alkaline pH conditions. To apply the unique features of dopamine, we synthesized Pt–PDA–RGO nanocomposites with a different quantity of dopamine, which are expected to preserve the improved Pt adsorption on graphene, resulting in the enhanced electrocatalytic performance. The morphology and micro-structure were examined by field emission scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. Compared to pristine Pt–deposited RGO (Pt–RGO), Pt–PDA–RGO (30 wt% dopamine against RGO) nanocomposites showed a superior electrochemical active surface area for a methanol oxidation. This could be related to the fact that the optimized c

소래습지생태공원(인천시 남동구)의 거미상

김주필(Joo Pil Kim),최한석(Han Seak Choi),예용택(Yong Taek Ye),예성훈(Seong Hun Ye),김태우(Tae Woo Kim),김대희(Dae Hee Kim),지승환(Seung Hwan Ji),지성현(Sung Hyun Ji),이형민(Hyung Min Lee),변진관(Jin Kwan Byun),조주완(Joo Whan Jo),박솔 한국거미연구소 2017 한국거미 Vol.33 No.2

한국거미연구회 회원들은 2017 년 8월 2일부터 3일까지 인천광역시 남동구 소재 소래습지생태공원을 김주필, 최한석, 예용택, 예성훈, 김태우, 김대희, 지승환, 지성현, 변진관, 이형민, 조주완, 박솔민, 이형진, 이태후, 이승후, 조윤규, 조원규, 이준이, 신정애, 이영경, 최라미, 이윤정, 이용화, 한주연, 윤혜원, 김형주 등 26명이 주야로 채집한 결과 14과 38속 50종을 발표 보고하는 바이다. From August 2 to 3 in 2017. Koran Arachnological Study members investigated the Spiders in the whole area Incheon Namdong-gu, and reported 14 Families, 38 Genus 50 Species of spiders. The collected spiders are placed (stored) in the Joo-Pil Spider museum.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

진도(전라남도, 진도군)의 거미상

김주필(Joo Pil Kim),지승환(Seung Hwan Ji),이형민(Hyung Min Lee),이형진(Hyung Jin Lee),이현동(Hyun Dong Lee) 한국거미연구소 2017 한국거미 Vol.33 No.1

2016년 7월 6일부터 8일까지 전라남도 진도군 일대를 한국거미연구회 회원인 김주필, 지승환, 이형민, 이형진, 이현동 등이 채집 조사한 결과 19과 47속 62종의 거미가 조사 연구되어 이에 보고하는 바이다. The author investigated the spiders of Jin island in July 06~08.2016. In the present paper 62 species of 47 genera belongs to 19 families were identified. These specimens are deposited at the Joo-Pil Spider Museum, Namyangju-Si, Gyeonggi-Do.

피로와 의료이용, 업무상 사고 및 질병결근

장세진,고상백,강동묵,김성아,정진주,이철갑,강명근,현숙정,조정진,차봉석,박종구 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Objectives: This study examined the relationship of fatigue to medical utilization, occupational accident and sickness absence. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project, 2002~2004). A total of 30,146 employees categorized within the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were recruited. A structured-questionnaire was used to assess the participants' sociodemo-graphics, job-related factors, health-related behaviors, personality trait, self=perceived fatigue (MFS) and the frequency of medical utilization, occupational accident and sickness absence. Data on medical utilization and occupational accident were confirmed from company health records. Chi-square test and logistic regression analysis were used to elucidate the relationship of self-perceived fatigue to medical utilization, occupational accident and sickness absence. Results: In logistic regression analyses, self-perceived fatigue was associated with medical utilization (outpatient), occupational accident and sickness absence although the strength of the associations was higher in the blue collar workers except for medical utilization. For medical utilization, the white collar worker's adjusted odds ratios of outpatient utilization for workers scoring in the third quartile and the highest quartile, compared to workers scoring in the lowest quartile were 1.50 (95% CI: 1.20-1.87) and 2.16 (95% CI: 1.69-2.75), respectively. The blue collar workers' adjusted odds ratios of outpatient utilization for workers scoring in the second (OR: 1.23, 95% CI: 1.06-1.43), third (OR: 1.42, 95% CI: 1.22-1.66) and highest quartile (OR:1.83, 95% CI: 1.55-2.17), respectively, compared to workers scoring in the lowest quartile were statistically significant. However, no associations were found between fatigue and inpatient utilization for either the white or blue collar workers. The blue collar workers' adjusted odds ratios of being injured for workers scoring in the second, third and highest quartile were 1.41 (95% CI: 1.00-2.00), 1.57 (95% CI: 1.10-2.22) and 2.41 (95% CI: 1.69-3.44), respectively, compared to those scoring in the lowest quartile, but, those of the white collar workers were not significant. There was more likely to an increased risk of sickness absence in workers scoring in the second, third and highest quartile compared to those scoring in the lowest quartile in both white and blue collar workers, but the magnitudes of risk were higher in the blue collar workers than the white collars workers. Conclusion: This result suggests that fatigue is a determinant predictor of medical utilization, occupational accident and sickness absence, and that the pattern of risks for the three outcomes differs according to the occupational type. Some limitations of this study and considerations for future study were also discussed.

안산시화호 갈대습지공원(경기도 안산시)의 거미상

김주필(Joo Pil Kim),최한석(Han Seak Choi),예용택(Yong Taek Ye),예성훈(Seong Hun Ye),김태우(Tae Woo Kim),김대희(Dae Hee Kim),지승환(Seung Hwan Ji),지성현(Sung Hyun Ji),이형민(Hyung Min Lee),변진관(Jin Kwan Byun),조주완(Joo Whan Jo),박솔 한국거미연구소 2017 한국거미 Vol.33 No.2

한국거미연구회 회원들은 2017년 8월 3일부터 4일까지 경기도 안산시 소재 시화호 갈대습지공원을 김주필, 최한석, 예용택, 예성훈, 김태우, 김대희, 지승환, 지성현, 변진관, 이형민, 조주완, 박솔민, 이형진, 이태후, 이승후, 조윤규, 조원규, 이준이, 신정애, 이영경, 최라미, 이윤정, 이용호, 한주연, 윤혜원, 김형주 등 26명이 주야로 채집한 결과 18과 49속 71종을 발표 보고하는 바이다. From August 3 to 4 in 2017. Koran Arachnological Study members investigated the Spiders in the whole area Gyeonggi-do Ansan-si, and reported 18 Families, 49 Genus 71 Species of spiders. The collected spiders are placed (stored) in the Joo-Pil Spider museum.

위계선형모형을 활용한 세무 및 회계 전공 선택의 결정요인 분석: 전문대학을 중심으로

문진주(Moon, Jin-Joo) 한국경영교육학회 2021 경영교육연구 Vol.36 No.2

[연구목적] 전공 선택은 학생 개인의 특성뿐 아니라 학생이 속해 있는 학과와 대학의 지원 등이 복합적으로 작용하기 때문에 개인 요인과 학교 요인의 영향을 동시에 살펴볼 필요가 있다. 따라서 본 연구에서는 전문대학 세무 및 회계 전공 선택과 개인 및 조직 요인의 위계적 관계를 규명하여 세무 및 회계학과의 학생모집과 학과전공 교육의 방향 등을 제시하고자 한다. [연구방법] 본 연구는 전문대학의 세무 및 회계 전공에 대하여 기존에 수행되었던 연구들을 검토하여 전공 선택에 영향을 주는 요인을 추출하였다. 전문대학 세무 및 회계 전공선택에 관한 개인 및 학교 요인의 효과를 검증하기 위하여 개인-학교의 2수준 다층모형(2-level hierarchical linear model, HLM)을 적용하여 분석하였다. 분석에 사용한 자료는 한국교육고용패널의 자료를 이용하였다. [연구결과] 분석 결과 학교 요인 중에 대학의 소재지와 대학의 취업률과 장학금 혜택이 유의한 영향이 있는 것으로 나타났으며, 개인 요인 중 본인의 적성과 희망, 가정형편이 유의한 영향이 있으며, 본인의 적성과 희망과 취업률, 가정형편과 대학 소재지와의 상호작용효과에서 유의한 영향이 있는 것으로 나타났다. [연구의 시사점] 본 연구의 결과는 전문대학의 세무 및 회계 전공 선택의 결정요인을 규명함으로서 학과의 입시 전략 및 학과 홍보에 활용될 수 있을 것으로 기대된다. [Purpose] The selection of a major requires not only the individual characteristics of the student, but also the application of the department and the university to which the student belongs, so it is necessary to examine the influence of the individual and school factors at the same time. [Methodology] In this study, the factors influencing the selection of major were extracted by reviewing previously conducted studies on the tax and accounting majors of junior colleges. In order to verify the effect of individual and school factors on the selection of tax and accounting majors in junior colleges, a 2-level hierarchical linear model (HLM) was applied and analyzed. The data used for the analysis were from the Korean Education and Employment Panel. [Findings] As a result of the analysis, it was found that the location of the university, the employment rate of the university, and the scholarship benefit were significantly affected among the school factors. It was found that there was a significant effect on the interaction effect between the employment rate, family circumstances, and university location. [Implications] The results of this study are expected to be utilized in the department’s admission strategy and department promotion by identifying the determinants of the tax and accounting major selection of junior colleges.

Tryophagus putrescentiae induces inflammatory cytokine secretions from the human cell lines THP-1 and EoL-1 cells

Jeon Sang‐Jin,Kim Eun Joo,Oh Jihyun,Yun Chi‐Young 한국곤충학회 2020 Entomological Research Vol.50 No.7

The present study aimed to identify the roles of the storage mite Tyrophagus putrescentiae (Tp) in relation to human skin diseases, such as atopic dermatitis. We examined the effects of T. putrescentiae extracts (TpE) on the secretion of inflammatory cytokines and their mRNA expression in human immune cells. Human monocytic THP-1 and eosinophilic EoL-1 cells were challenged with TpE and the inflammatory cytokines, interleukin-6 (IL-6), interleukin-8 (IL-8), and monocyte chemotactic protein-1 (MCP-1) secreted in culture supernatant were analyzed using an enzyme-linked immunosorbent assay (ELISA). The mRNA levels in the cell cultures were also measured via reverse transcriptase-polymerase chain reaction (RT-PCR). In the THP-1 cells, the TpE significantly induced the secretion of IL-6, IL-8, and MCP-1 in a time- and dose-dependent manner. It also stimulated increases in the expression levels of the IL-6, IL-8, and MCP-1 mRNA. However, while the TpE induced IL-8 and MCP-1 mRNA levels in the EoL-1 cells, it did not induce IL-6 expression. Using Western blot analysis, we confirmed the activation of extracellular signal-regulated kinase (ERK), a member of the mitogen-activated protein kinases (MAPKs), in response to TpE challenge of the THP-1 cells. Collectively, our results show that TpE challenge elicits inflammatory response in the human monocytic THP-1 and eosinophilic EoL-1 cells, and it induces increased production of the inflammatory cytokines IL-6, IL-8, and MCP-1.