포스포늄염을 포함하는 가교 고분자의 제조 및 그들의 감습특성

이칠원,공명선,이승재 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

고습도 또는 결로시 내수성을 지니는 저항형 습도센서를 제조하기 위하여 vinylbenzyl tributyl phosphonium chloride를 포함하는 4원 공중합체를 합성하여 저습도와 고습도 범위에서 측정이 가능한 습도센서용 감습막을 제작하였다. 1,5-dibrompentane과 4차 염화 가교 반응을 통하여 최종 저항형 습도 센서를 제작하였다. 감습막은 알루미나 기판에 한 쌍의 금 paste가 인쇄된 전극을 사용하였으며, 감습막은 다양한 비율의 vinylbenzyl tributyl phosphonium chloride, 2-(dimethylamino)ethyl methacrylate, 2-ethylhexyl acrylate, 그리고 [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride등을 이용하여 제조하였다. 감습막은 micro-syringe를 이용하여 도포하였으며 건조 oven에서 50 ℃에서 6 시간 동안 가교반응을 진행하였다. 습도센서의 임피던스 특성은 2-(dimethylamino)ethyl methacrylate 또는 [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride의 함량이 증가할수록 감소하였다. vinylbenzyl tributyl phosphonium chloride / 2-(dimethylamino)ethyl methacrylate / 2-ethylhexyl acrylate / [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride의 조성비가 4/4/1/1인 공중합체의 경우 30∼90%RH 범위에서 2.64 MΩ ∼ 3.11MΩ 의 임피던스 특성을 보였으며 우수한 직선성과 낮은 히스테리시스 나타내었다.

유아교육실습 지도교사 교육프로그램 개발 연구

윤기영,정현숙,류칠선 서원대학교 교육연구소 2001 敎育發展 Vol.20 No.2

The purpose of this study was to develop a in-service teacher education program for student teaching in early childhood education center in order to reinforce student teacher's educational role for improving their student teaching. In this paper, the sample consisted of 20 early childhood professionals who have experienced at least 3 years in students teaching program. The survey was administered using the Delphi method. The study explored the objectives, contents, administration and method, and evaluation of the developed program. We also attempt to outline the present conditions and problems on student teaching in early childhood education center. As a conclusion, the program have to assist the able kindergarten teacher for understanding student teacher correctly, to consist and administrate a practicum program with systematic support.

Dose Customized Apron Micro Functional Design Using Convergence Shielding Sheet

Seon-Chil Kim 한국융합학회 2021 한국융합학회논문지 Vol.12 No.11

본 의료기관에서 사용되는 방사선 차폐복은 납당량 0.25 mmPb를 기준으로 제시하고 있다. 그러나 신체 각 부위별 감수성을 고려하고 사용자의 활동성을 보장할 수 있는 동시에 정밀한 방어가 가능한 차폐복 제작에 대해 연구하고자 한다. 친환경 차폐 재료를 기반으로 제작하여 기존 납 Apron의 중량 문제와 환경 문제를 해결하 는 동시에 두께로 납당량과 동일한 차폐성능을 제시하고자 하였다. 제작된 차폐시트의 원단은 납당량 0.12 mmPb부터 0.32 mmPb까지 차폐시트의 두께로 조절하는 카렌더 공정을 통해 제작하였다. 각 신체 부위별 감수 성을 고려한 차폐복을 제작하여 의료기관에서 상시 착용하고 있는 대상자를 통해 사용성평가를 실시하였다. 차폐 복을 착용한 후 활동성이 좀 더 증가하였다는 의견이 많았으며, 무게는 0.26kg을 줄였다. 향후에는 의료기관의 종사자의 활동성을 고려한 차폐복 디자인 개선 노력이 필요할 것으로 사료된다. Radiation shielding clothing for medical institutions is used based on lead equivalent of 0.25 mmPb. However, this study intends to study the shielding suit that can guarantee the user's activity while considering the sensitivity of each part of the body. By manufacturing based on eco-friendly shielding material, it was attempted to solve the weight problem and environmental problem of existing lead aprons, and to present the same shielding performance as lead equivalent in thickness. The fabric of the produced shielding sheet was manufactured through a calendar process that adjusts the thickness of the shielding sheet from lead equivalent 0.12 mmPb to 0.32 mmPb. In addition, the usability evaluation of the manufactured shielding clothes was conducted for the subjects who were workers in medical institutions. As a result, the activity became easier and the weight was reduced by 0.26 kg. In the future, it is thought that it is necessary to improve the shielding suit design considering the activity.

Hybrid type radiation shielding sheet manufacturing technology development of complex multi-layered dispersion structure

Seon-Chil Kim(김선칠) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.4

Preceding Research on Comparative Analysis of the Validity of Game based Cognitive Training Program for Children with Intellectual Disabilities

Seon-Chil Kim 한국융합학회 2021 한국융합학회논문지 Vol.12 No.11

최근 많은 디지털 콘텐츠가 제시되고 있지만, 발달장애 아동 중 지적장애 아동을 대상으로 한 디지털 콘텐츠는 거의 제작되지 않았다. 지적장애 아동의 인지 개선을 위한 훈련프로그램을 기존의 대면 도제식 수업이 아닌 비대면 원격 으로 수업을 진행하기 위해서는 디지털 콘텐츠 기반의 훈련 프로그램이 필요하다. 본 연구는 게임 기반으로 제작된 뉴로 월드의 항목과 K-WISC-Ⅳ의 소항목과 비교하여 항목 간 상관관계로 공인 타당도를 분석함으로써 새로운 인지훈련 프로 그램을 제시하고자 하였다. 검사항목과 훈련 항목 간의 상관관계에 있어 일부 타당성이 있는 것으로 나타났고, 이는 일부 분의 훈련 항목이 공인 타당성을 지니고 있다는 것을 의미한다. 신뢰도 측면에서는 Cronbach 알파값이 0.794로 지적장 애 아동들의 게임 수행력과 각 게임마다의 레벨 상승 정도가 어느 정도 신뢰성이 있는 것으로 나타났다. 이는 인지훈련 도구의 임상실험을 위한 향후 연구에 있어서 유의미한 결과로 사료된다. Recently, many cognitive training programs based on digital contents have been presented, but few digital contents have been produced for children with intellectual disabilities among children with developmental disabilities. Digital contents based training programs are needed to apply remotely untact training programs rather than face-to-face apprenticeship classes for improving the cognition of children with intellectual disabilities. This study was attempted to present the new cognitive training program by analyzing concurrent validity, which was analyzed by the correlation between items by comparing with subtests of K-WISC-IV and items of game based Neuro-World cognitive training program. It was found that there are some validity by analyzing correlation between the subtests of K-WISC-IV and the items of Neuro-World program, which means that it has concurrent validity of some items of Neuro-World program. In terms of reliability, the Cronbach alpha value was 0.794, indicating that game performance of children with intellectual disabilities and the degree of level increase in each game were somewhat reliable. This is considered to be a significant result in future studies for clinical trials of cognitive training tools.

Evaluation of radiation shielding performance according to the particle size of the shielding material

Seon-Chil Kim(김선칠) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

Shields used in medical institutions are mainly used in the form of sheets. The density and thickness of the shielding sheet depend on the process technology and the blending of the shielding material and the base material, and in order to increase the density, it is necessary to reduce the porosity between particles and increase the particle packing. This study aimed to evaluate the shielding performance according to the particle size for lightening of shield and thin thickness. The tungsten was mixed with high-density polyethylene under the same process technology conditions to fabricate three types of sheets according to each particle size. As a result, the nanoparticle sheet had 5% better shielding performance at high tube voltage than the microparticle sheet and the sheet manufactured by mixing the two particles, and the difference in shielding performance between the remaining two sheets was insignificant. In addition, the clustering effect of narrowing the distance between particles was more pronounced when nanoparticles were used, and due to the multi-layered structure of the particles according to this effect, the density was improved. The results of this study are thought to be able to effectively respond to the production of shielding sheets used in medical institutions.

Verification of radiation protection effect of composite shielding material hand cream material

Seon-Chil Kim(김선칠) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4

Development of dispersion technology for plastic radiation shield that can be processed in free form

Seon-Chil Kim(김선칠) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.4

Proposal of a Multi configurations usability evaluation model considering ease of use

Seon-Chil Kim,Jong-Ha Lee,SeongWook Cho 대한인간공학회 2017 대한인간공학회 학술대회논문집 Vol.2017 No.4

Radiation shielding fiber using tungsten and barium sulfate composite yarn

Seon-Chil Kim(김선칠) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

Exposure to radiation from the public is caused by natural or medical radiation. In particular, flight attendant and medical staff are exposed to radiation hazards from low doses, such as scattering rays. In this study, tungsten and barium sulfate were selected as eco-friendly shielding materials to replace lead, and composite yarns were made using the yarns of this material and then woven as fibers. First, a 50 ㎛ tungsten wire was prepared and used as a core yarn. In addition, PET fibers containing 5% of barium sulfate were produced through a melt spinning process, and these PET fibers were double-covered on a tungsten wire in the S or Z direction to produce a composite yarn. The shielding fiber woven using the composite yarn has a thickness of 0.25-0.31 mm, and the shielding test shows a shielding rate of 26.3% at 27.7 keV effective energy, and has a shielding performance of 0.015 mmPb based on the standard lead equivalent. In addition, it satisfies sufficient flexibility and strength to produce various shielding clothing such as aprons and scarves. The developed shielding fiber is expected to be usefully applied to the defense of scattered rays for workers such as flight attendants.