• 한국안전학회지
• /
• 제31권1호
• /
• pp.66-73
• /
• 2016

Lyocell fibers were used as a precursor in order to improve yield and strength of cellulose-based precursor while manufacturing activated carbon fiber(ACF). Lyocell fibers as a precursor for the preparation of ACF were surface-modified by reaction with 3-aminopropyltriethoxysilane(APTES) and pre-treated with KOH and H3PO4. Using aforementioned precursor, ACFs were prepared by a series of stabilization, carbonization and activation process at high temperatures. On each process, FT-IR, TGA, UTM and SEM were used to observe fibers' physical properties including structure and porous surfaces. FT-IR results proved that surface modification was achieved during stabilization, carbonization and activation process. TGA results during carbonization process found that surface modified fibers with APTES 0.02 mol(A2) showed higher thermostability, and extended pre-treatment increased yield. Especially, yield was found to have an increase of 10~20 wt% with surface modification during activation process. UTM results showed that tensile strength has the same order of concentration of APTES after surface modification, however, was found to show lower tensile strength than lyocell fibers after stabilization process. SEM results revealed that more homogeneous porosity control could be proceed after modifying the surface for the effective removal of hazardous substances.

• 한국콘텐츠학회논문지
• /
• 제16권7호
• /
• pp.522-531
• /
• 2016

평균수명 연장과 2010년부터 베이비부머들이 은퇴하고 노인인구로 편입되면서 은퇴 후 삶에 대한 불안감이 고조되고 있다. 이러한 불안감을 제거하기 위한 선행연구들은 은퇴인식과 경제적 은퇴준비가 은퇴 후 삶에 직 간접적인 영향을 미친다고 하였다. 본 연구는 경제적 은퇴준비 상황에 따라 은퇴준비 관련 변인들이 차이가 있는지를 파악하고, 경제적 은퇴준비 상황이 은퇴 및 노후생활 인식, 은퇴준비 행동, 은퇴만족도 사이에서 조절효과가 있는지를 분석하였다. 이를 위하여 2015년 11월부터 2016년 2월까지 전국 만 20세부터 69세 이하 성인남녀 1,500명을 대상으로 연구 목적과 절차를 안내하는 서한과 함께 우편으로 설문지를 배포한 후 수거하거나 연구자가 직접 배포하고 수거하는 방식으로 설문조사를 실시하였다 불성실하게 응답한 83건을 제외한 설문지 1,417부를 최종 분석하였다. 분석 결과, 경제적 은퇴준비를 잘할수록 은퇴 및 노후생활 인식이 긍정적이고, 은퇴준비 행동도 적극적으로 할 가능성이 높으며, 은퇴만족도가 높다는 것이 확인되었다. 본 연구는 보편적이고 실제적인 은퇴준비 프로그램 개발을 위한 기초자료로 활용할 수 있다는 점에서 의의가 있다.

• 대한기계학회논문집A
• /
• 제34권12호
• /
• pp.1785-1791
• /
• 2010

중합효소 연쇄반응(PCR)을 수행하려면 세포 용해(cell lysis)와 DNA추출(DNA purification)과정이 포함된 시료 전처리 과정을 거쳐야 한다. 종래의 시료 전처리 과정은 계면활성제와 같은 세포용해 버퍼를 이용하거나 열 또는 전기적 방법으로 세포막 파열을 유도하여 세포벽을 깬 후에 잔여물 처리과정을 거쳐 DNA를 추출하게 된다. 본 연구에서는 마이크로 비드와 PDMS 기둥을 이용한 필터가 있는 시료 전처리용 바이오칩을 설계 및 제작하였다. 또한 제작된 바이오칩을 사용하여 $80^{\circ}C$에서 2분간 세포용해를 수행하고 DNA를 추출하였다. 칩에서 전처리과정을 거친 시료내의 DNA농도와 순도를 측정하고 DNA PCR과 겔 전기영동을 통해 시료 전처리용 바이오칩의 성능을 평가하였다.

• 한국융합학회논문지
• /
• 제11권5호
• /
• pp.229-239
• /
• 2020

본 연구의 목적은 퇴소를 앞둔 경증지적장애 청소년의 심리치료 상담과정과 자립준비 생활경험에 도움을 주고자 실시하였다. 사례연구의 범주화 내용은 다음과 같다. "서툴고 힘들었지만 추억이 있는 시설생활" "아프고 성장하고 쓸쓸한 나의 사춘기" "의지할 수 없는 존재" "기대감과 두려움의 자립과정"등의 주제로 범주화 할 수 있다. 연구 참여자는 퇴소와 자립준비과정에 대해서 두려움을 가지고 있었으나 심리치료적 개입으로 변화되고 극복되는 의미 있는 결과가 나타났다. 따라서 퇴소를 앞둔 경증지적장애 청소년에 적합한 자립준비와 직업탐색에 치료적 의의가 있다고 할 수 있다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 22-24 Oct. 1991
• /
• pp.1817-1822
• /
• 1991

A method of reducing overhead caused by the processor synchronization process and common memory accesses in finely grained tasks is described. We propose a scheduler which considers the preparation time during searching to minimize the redundant accesses to shared memory. Since the suggested hardware (synchronizer) determines the access order of processors and bus arbitration simultaneously by including the synchronization process into the bus arbitration process, the synchronization time vanishes. Therefore this synchronizer has no overhead caused by the processor synchronization[l]. The proposed scheduler algorithm is processed in parallel. The processes share the upper bound derived by each searching and the lower bound function is built considering the preparation time in order to eliminate as many searches as possible. An application of the proposed method to a multi-DSP system to calculate inverse dynamics for robot arms, showed that the sampling time can be twice shorter than that of the conventional one.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제50권6호
• /
• pp.271-275
• /
• 2001

We investigated preparation of 1-3 PZT composites for medical ultrasonic transducer array (briefly UTA) using micro pressing method. The proposed process was using pressing PZT green sheet by PMMA micro mold obtained from X-ray lithography. Microstructures, electriacl and electro-mechanical properties of fabricated composites were analyzed. Dielectric constant at 1kHz and thickness mode electro-mechanical coupling coefficient of $6.2mm{\times}6.2mm{\times}422{\mu}m$ UTA sample were 1754 and 51%, respectively. Microstructures of sintered PZT showed dense and uniform. And PZT phases were well crystallized. Micro pressing method is a mass productive process in case of using injection molded PMMA by batch type LIGA process.

• 센서학회지
• /
• 제24권2호
• /
• pp.88-92
• /
• 2015

In order to study the semi-conductive characteristics of carbon black-filled ethylene-propylene-diene monomer (EPDM) composite film, which is used for measuring occlusal force, composite samples with volume ratios of carbon black to EPDM ranging from 30% to 70% were prepared. The process of making a composite film consists of two steps, which involve the preparation of a slurry composition and the fabrication of a thin film using solution casting and a lamination process. To prepare the slurry composition, we dispersed carbon black nanoparticles into an organic solvent before mixing with an EPDM solution in toluene. The mechanical and electrical properties of the resulting carbon black-filled EPDM film were then investigated, and the results showed that the electrical resistance of a film decreases with the increase in the carbon black content. Furthermore, improved elastic recovery was observed after cross-linking the EPDM.

• 한국컴퓨터정보학회논문지
• /
• 제9권3호
• /
• pp.109-113
• /
• 2004

본 논문에서는 데이터 마이닝을 위한 데이터 준비 과정에 대하여 기존의 데이터 마이닝 도구들의 효율성을 비교하고, 새로운 효율적인 데이터 준비 시스템 설계 기준을 제안하고자 한다. 지역 및 원격 데이터베이스 접근방법 이기종 컴퓨터간의 정보 교환을 기준으로 기존의 데이터마이닝 도구들의 기능을 비교하였다. 본 논문에서는 앤서트리, 클레멘타인, 엔터프라이즈 마이너, 웨카를 비교하였다. 또한, 본 논문에서는 분산 네트워크 상에서 데이터 마이닝을 위한 효율적인 데이터 준비 시스템을 위한 설계기준을 제안한다.

• 멤브레인
• /
• 제6권2호
• /
• pp.72-78
• /
• 1996

양이온성의 quaternary ammonium polysulfone인 AMPS는 2단계 과정을 통하여 제조하였다. 먼저, 폴리술폰을 chloromethyl methyl ether와 촉매로 ZnO를 사용하여 chloromethylation반응으로 CMPS를 제조하는 단계와 준비된 CMPS에 triethylamine을 반응시켜 quaternary ammonium기를 도입시키는 amination 단계로 이루어 진다.

• 한국병원경영학회지
• /
• 제20권3호
• /
• pp.45-55
• /
• 2015

While the influence of healthcare accreditation system to the quality improvement of hospitals has more increased, regarding the preparation costs for healthcare accreditation, it has never been empirically studied about the costs that are actually invested by hospitals. This study is going to determine the difficulties in the preparation process of accreditation and details of accreditation preparation costs for hospitals that participated in the healthcare accreditation system and acquired accreditation. The survey was performed in a self-reported form from February 28 to March 21 2014 for 189 acute hospitals accredited as a hospital from 2011 to February 2014. Of all questionaries of survey participants, 98 were recovered; the response rate was 51.9%. A total of 40 questionnaires were used except for 58 containing insincere answers. Main findings are followings: Firstly, findings showed that advanced general hospitals spent the most statistically significantly highest in terms of equipments and total costs among cost items for accreditation preparation. When accreditation preparation costs items were classified according to classification of hospitals, advanced general hospitals spent the most statistically significantly highest in the equipments and total costs. Also in terms of regional, Gyeonggi, Incheon regions were found to spend statistically significantly higher costs in the equipments costs. Secondly, as a result of the survey in the distribution of the total accreditation preparation costs, advanced general hospitals have disbursed the most out of all. However, the result in hospitals does not show significant difference to the expense of advanced general hospitals and that especially other regional hospitals spent higher costs. As such, all hospitals are under a heavy burden of higher costs on accreditation preparation, especially hospitals. The build-up of infrastructures by hospitals through an accreditation system consequently led to a higher initial investment; if the accreditation system is effective in improving the quality of health care and patient safety, appropriate responses are needed. In other words, financial support for investment costs needs to be given to allow hospitals to actively participate in the accreditation system.