• 제목/요약/키워드: Following process

검색결과 4,648건 처리시간 0.03초

Apoptotic Cell Death Following Traumatic Injury to the Central Nervous System

  • Springer, Joe E.
    • BMB Reports
    • /
    • 제35권1호
    • /
    • pp.94-105
    • /
    • 2002
  • Apoptotic cell death is a fundamental and highly regulated biological process in which a cell is instructed to actively participate in its own demise. This process of cellular suicide is activated by developmental and environmental cues and normally plays an essential role in eliminating superfluous, damaged, and senescent cells of many tissue types. In recent years, a number of experimental studies have provided evidence of widespread neuronal and glial apoptosis following injury to the central nervous system (CNS). These studies indicate that injury-induced apoptosis can be detected from hours to days following injury and may contribute to neurological dysfunction. Given these findings, understanding the biochemical signaling events controlling apoptosis is a first step towards developing therapeutic agents that target this cell death process. This review will focus on molecular cell death pathways that are responsible for generating the apoptotic phenotype. It will also summarize what is currently known about the apoptotic signals that are activated in the injured CNS, and what potential strategies might be pursued to reduce this cell death process as a means to promote functional recovery.

가정의 심리적 과정환경과 대학생의 가족가치관에 관한연구 (The Study on Psychological Process Home Eniveronment and Family Value Orientations of Students)

  • 고정자
    • 가정과삶의질연구
    • /
    • 제14권1호
    • /
    • pp.85-96
    • /
    • 1996
  • The purpose of this study is to investigate the psychological process home environment that students perceived and theirs family value orientations. The subjects of this study were 848 students randomly selected from 6 niversities in Pusan area. The collected data was analysed by following methods : T-test Paired T-test One way Scheffe-test MANOVA and Pearson's correlation coefficients. The following conclusions are derived from the data analysis in this study: First The psychological process home environment that students perceived is achieved opened attracted and autonomous. And theirs family value orientations are somewhat moderns. Second There were significant differences according to religions sibling order SES mother's jobs in the family value orientations Third There were significant correlations beween the psychological process home environment that students perceived and their family value orientations.

  • PDF

上東産 비스무트를 原料로한 次窒酸비스무트의 製造 (The Preparation of bismuthsubnitrate)

  • 이용근
    • 대한화학회지
    • /
    • 제10권3호
    • /
    • pp.123-128
    • /
    • 1966
  • The preparation of bismuthsubnitrate for the purpose of medicine, with both crude and refined bismuth metals, has been performed by applying the following methods: (A) Neutralization process, (B) Hydrolysis process. On the basis of results of a series of experiments, the following conclusion was obtained: 1) The quantitative determination showed that there was little difference between these two processes, in their yields. However the process (B), hydrolysis method was technically more simple than (A), neutralization method, and purity of final product by process (B) was found to be much more superior to (A). 2) It was found that bismuthsubnitrate products obtained from refined bismuth metal was almost the same with imported ones (Fisher, Squibb, etc.) in their purities.

  • PDF

굴착토를 활용한 속경성 유동성 채움재의 공학적 특성 평가 (Engineering Characteristics Assessment of Rapid Set Controlled Low Strength Material for Sewer Pipe Using Excavated Soil)

  • 김영욱;이봉춘;정상화
    • 한국건설순환자원학회논문집
    • /
    • 제8권4호
    • /
    • pp.450-457
    • /
    • 2020
  • 본 연구에서는 현장 굴착토를 활용한 속경성 유동성 채움재의 배합요인별 유동성, 재료분리 저항성, 재령별 압축강도 등의 공학적 특성을 검토하여 속경성을 발현하는 배합비 및 결합재 조건을 도출하였으며, 이를 토대로 현장 모사 실험을 실시하여 현장에서 적용 가능한 후속공정 개시기 검토 방법의 유효성을 검토하고자 하였다. Kelly ball 낙하시험과 산중식 토양 경도계의 평가결과 유동성 채움재의 후속공정 개시기 확보 가능한 시간은 동일하게 약 3시간으로 나타났으며, 일축압축강도 시험의 결과와 비교하였을 때 Kelly ball 낙하 시험 및 산중식 토양경도계의 현장 적용성에 대한 유효성을 확인할 수 있었다.

DAF 공정을 이용한 축산폐수의 고형물 분리와 부상특성 (Solid Separation and Flotation Characteristics of Livestock Wastewater Using DAF Process)

  • 강병준;유승준;이세일;곽동희
    • 상하수도학회지
    • /
    • 제22권3호
    • /
    • pp.359-366
    • /
    • 2008
  • The series of experiments under the various conditions were carried out to evaluate the feasibility of dissolved air flotation (DAF) as an alternative of conventional gravity sedimentation (CGS) and to investigate the decrease of the loadings following to biological wastewater treatment processes in livestock wastewater system. On the basis of the experiment result between CGS and DAF processes, for the other water quality criteria as well as suspended solid the removal efficiency of DAF process was about 20~25 % better than CGS process on average. In addition, the particle removal efficiency of DAF process became higher in proportion as the increase of air to solid (A/S) ratio and the general wastewater treatment efficiency of DAF process was enough to meet the requirement of loading decrease to following biological process even at low A/S ratio range. Though DAF process is widely known as an solid separation unit, there was not the notable relationship between particle separation efficiency and several pollutant removal efficiencies like $COD_{Cr}$ and nutrients (T-N, T-P). Assume that the $COD_{Cr}$ was removed as the fraction of particle separation in this experiment, the removal efficiency of T-N and T-P were sensitive to removal efficiency of $COD_{Cr}$, especially.

서-보 메카니즘에 관한 레귤레이터와 모델 추종 제어기의 설계 (Design of Regulator and Model Following Controller on Servomechanism)

  • 최선필;전상영;임화영
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1989년도 추계학술대회 논문집 학회본부
    • /
    • pp.411-414
    • /
    • 1989
  • In this paper, design of the regulator and model following is studied controller on servomechanism for discrete time system. The design of the servomechanism controller is studied on the method of mode1 following controller for the output of the process to follow the output of its model. Furthermore, a common approach to eliminate disturbance and steady-state error between the outputs of the process and its model is to introduce an integrator into the control loop itself. They are eliminated when we incorporate the integrator into the closed loop system.

  • PDF

지역기반 사회환경교육 프로그램 개발에 관한 연구-생태보전시민모임 숲속 자연학교 사례- (A Case Study of the Community-based Nonformal Environmental Education Program Development-On the Case of the Nature School in the Forest-)

  • 지은경;김종욱
    • 한국환경교육학회지:환경교육
    • /
    • 제16권1호
    • /
    • pp.34-47
    • /
    • 2003
  • The purpose of this study is to analyze the program development process of a nonformal environmental education(EE) program in detail. For the purpose, following research questions were answered in "the Nature School in the Forest" program in Eco-Club 1) What is the program development process? 2) What is the role of staffs, program developers, in the program development process? What are the meanings of their pedagogical approach? 3) With the findings of this study, how is the researcher able to develop ground theory for community-based nonformal EE, and to promote theoretical discussion for field improvement? The data were mainly gathered through participation observation and unstructured interview. And the data were analyzed by qualitative techniques such as clustering, factoring, noting pattern and themes, seeing plausibility, making metaphors, and building logical chain of evidence. The following conclusion comes out of the findings of this study. "The Nature School in the Forest" program is a educational device which the community-based NGO chose as a strategy to change individuals and community with its ideological purpose. And the program development process was the contiuous group decision-making process among staffs and volunteers. Consequently "the Nature School in the Forest" program is a circulated process of the voluntary activists training and their participation in program operation.

  • PDF

복합레진 표면의 중합률 (THE RELATIVE DEGREE OF CONVERSION OF THE COMPOSITE RESIN SURFACE)

  • 박성호
    • Restorative Dentistry and Endodontics
    • /
    • 제21권1호
    • /
    • pp.360-365
    • /
    • 1996
  • The purpose of this study was to evaluate the changes in the degree of conversion on a composite resin surface following heat treatment and mylar strip finishing. The effects of the time interval between the light-curing and heat-curing process were also evaluated. The composite resin surface which had been covered with a coverglass showed a lower conversion rate than the surface from which a layer of $500{\mu}m$ was ground away. The composite resin surface was definitely affected by oxygen during the heat curing process when it had not been insulated. When the composite resins were heat cured after 3 days of storage following the light curing process, the increased in the degree of conversion through heatcuring was limited.

  • PDF

기준모델 추종 자구구성 퍼지 논리 제어기 (Reference Model Following Self-Organizing Fuzzy Logic Controller)

  • 배상욱;권춘기;박귀태
    • 한국지능시스템학회논문지
    • /
    • 제4권1호
    • /
    • pp.24-34
    • /
    • 1994
  • A RMFSOC(Reference Model Following Self-Organizing Fuzzy Logic Controller) is propose in this paper. In the RMFSOC, the refernce model is introduced, where the desired control performance can be specified by an operator of the controlled process. The self-organizing level of the RMFSOC organizes the control rules of FLC which make the process output follow the reference model output. In addition, for the use of preventing improper modifications of control rules, a complementary decission rule is induced from the possible relations between the process output and reference model output. Through a simulation study, it is shown that the robustness of the control system using the proposed RMFSOC to the set-point changes and distur bances can be greatly improved being conpared with that of the control system using the Procyk and Mamdani's SOC.

  • PDF

치과 SLM용 Ni-Cr 금속분말 특성 관찰 (Production of Ni-Cr Metal Powder by Selective Laser Melting for Dentistry to Observation of Characteristics)

  • 홍민호
    • 대한치과기공학회지
    • /
    • 제37권1호
    • /
    • pp.23-29
    • /
    • 2015
  • Purpose: The selective laser melting (SLM) process for dentistry, which is one of the additive manufacturing technologies (AM) allows for rapid production of a three-dimensional model with complex shape by directly melting metal powder. This process generates detailed items of a three-dimensional model shape through consolidation of a thin powder layer by utilizing both selective melting and laser beam simultaneously. In regard to SLM process, Fe-base powder, Ti-6AI-4V powder, AI-base powder, etc. have been researched. It is believed that the aforementioned technologies will be widely utilized in manufacturing metal parts using metal powder of raw material. This study chose Ni-Cr-Mo metal powder in order to manufacture metal powder materials that would be used in the selective laser melting for dentistry. Methods: This study manufactured metal powder using mechanical alloying technique (MA) among those metal powder manufacturing techniques. Moreover, this study aimed to utilize the metal powder manufactured after observing the characteristics of powder as preliminary data of Ni-Cr-Mo metal powder. This study could obtain the following conclusions within the experimental limitations. Results: As a result of mechanically alloying Ni-Cr-Mo powder over time, its mean particle size was $66.93{\mu}m$ $54.4{\mu}m$ and $45.39{\mu}m$ at 10h, 20h and 30h, respectively. The gtain form of metal powder by mechanical alloying technique was a sponge-like shape of irregular plate; however, the gtain form manufactured by high-pressure water aromization process had the following three types: globular type, chain type and oval type. Conclusion: This study found $37.65{\mu}m$ as the mean particle size of Ni-Cr-Mo metal powder, which was manufactured using water atomization technique under the following conditions: water atomization flux of 300 liter/min, hydraulic pressure of $400kgf/cm^2$ and injection angle of $45^{\circ}$. This study confirmed that the grain form of powder (solid particle form) would vary depending on the manufacturing process.