• 한국지반공학회논문집
• /
• 제22권12호
• /
• pp.45-55
• /
• 2006

본 논문에서는 우리나라 태안지역에서 총 30회 수행한 암반앵커 현장시험의 결과를 나타내었다. 대상암반은 편마암으로써 풍화가 심한 것부터 신선한 암에 이르기까지 다양하며, 시험앵커의 깊이는 $1{\sim}4m$로 설치하였다. 앵커는 SD4O-D51mm를 사용함으로써 다른 파괴가 일어나기 전에 암반파괴가 먼저 일어나도록 유도하여 암반의 인발지지력을 파악하고자 하였다. 많은 시험에서 파괴는 극한하중까지 이르는 것을 관찰할 수 있었으며, 암반파괴형상은 암반이 들어올려지면서 방사상으로 균열이 발달하는 형상을 나타내었다. 시험결과, 암반앵커의 인발지지력은 암반의 종류, 암질, 앵커의 정착깊이, 앵커텐던의 인장강도 등에 영향을 받는 것으로 나타났다. 본 시험을 통해 암반앵커시스템의 인발지지력을 지배하는 주요파라메터들을 도출하고 이에 대해 논하였다.

• 한국지반공학회논문집
• /
• 제25권10호
• /
• pp.5-15
• /
• 2009

본 논문에서는 옥천 및 창녕지역에서 총 24회 수행한 암반앵커 현장인발시험의 결과를 나타내었다. 시험앵커의 정착깊이는 1~6m로 서로다른 암반내에 설치하였다. 앵커의 대부분은 고강도 이형철근인 SD40-D51mm를 사용함으로써 다른 파괴가 일어나기 전에 암반파괴가 먼저 일어나도록 유도하여 암반의 인발저항력을 파악하고자 하였으며, 일부에서는 SD40-D32mm앵커를 설치하여 앵커의 파괴도 아울러 살펴보았다. 많은 시험에서 파괴는 항복에 이르는 극한하중까지 관찰할 수 있었으며, 암반파괴형상은 암반이 들어올려지면서 방사상으로 균열이 발달하는 형태를 나타내었다. 또한 시멘트그라우트와 텐던사이의 부착강도를 평가하고자 방식쉬이스가 설치된 앵커에 대해 실내실험을 실시하였다. 실험결과 텐던-그라우트 사이의 부착강도는 그라우트 일축압축강도의 18~25%로 나타났으며, 방식쉬이스에 의한 부착력 감소는 무시할 수 있을 정도로 작게 나타났다.

• 대한한방내과학회지
• /
• 제18권1호
• /
• pp.62-68
• /
• 1997

Dysphagia generally has a good prognosis after stroke involving cerebral hemisphere or braibstem, but it could have serious consquence with dehydration leading to haemoconcentration, renal failure and aspiration leading to pneumonia. This preliminary report was written for main report. The main report will be written to give an objective guide post of management and treatment in stroke patient with dysphagia. The objective guide posts were follows as, 1. Close examination for relationship between dysphagia in stroke patients and other neurological deficits 2. Influence on the prognosis of dysphagia in stroke patients by the grade of dysphagia at admission time. 3. The realtionship between the site and size of brain damage and the grade and prognosis of dysphagia 4. The frequency and prognosis of dysphagia in stroke patients according to sex and age. 5. The rate and speed of recovery with dysphagia after stroke. 6. Frequency and process of complications, aspiration pneumonia, weight loss, sore, in stroke patient group with dysphagia.

• Steel and Composite Structures
• /
• 제19권3호
• /
• pp.601-614
• /
• 2015

The Metal Magnetic Memory (MMM) method is a non-destructive testing method based on an analysis of the self-magnetic leakage field distribution on the surface of a component. It is used for determining the stress concentration zones or any irregularities on the surface or inside the components fabricated from ferrous-based materials. Thus, this paper presents the MMM signal behaviour due to the application of fatigue loading. A series of MMM data measurements were performed to obtain the magnetic leakage signal characteristics at the elastic, pre-crack and crack propagation regions that might be caused by residual stresses when cyclic loadings were applied onto the A283 Grade C steel specimens. It was found that the MMM method was able to detect the defects that occurred in the specimens. In addition, a justification of the Self Magnetic Flux Leakage patterns is discussed for demonstrating the effectiveness of this method in assessing the A283 Grade C steel under cyclic loadings.

• 한국동물위생학회지
• /
• 제34권4호
• /
• pp.441-448
• /
• 2011

According to the Korean government policy of expanding HACCP system application to food chain from farm to meat market, the importance of HACCP assessment to keep balance among the certified HACCP plants is urged. The objective of this study is to recommend more effective HACCP assessment methods. We reviewed major foreign countries HACCP implementation policy focused on the audit system, and compared with the Korean HACCP assessment system. We found that the checklist guidelines of prerequisite program were not enough for precise evaluation and many of the items were not directly related to the risk occurrences. And current rating grade for each items and judgments were inadequate to induce non-compliances and corrections for better HACCP implementation. We suggest revision points as follows; (1) checklists should be revised and reorganized according to the possibility of risk occurrences, (2) all the items should be supported by detailed guidelines for more objective inspection, (3) non-compliances identified must be reconfirmed after correction, (4) the items for HACCP plan should be divided into an accreditation inspection and a regular inspection, (5) rating grade 'high', 'medium', 'low', 'failure' was better for indicating non-compliances.

• Computers and Concrete
• /
• 제21권2호
• /
• pp.157-166
• /
• 2018

This article presents the flexural behaviour of reinforced fly ash (FA)-based geopolymer concrete (GPC) beams with partial replacement of FA for about 10% by weight with paper sludge ash (PSA). The beams were made of M35 grade concrete and cured under three curing conditions for comparison viz., ambient curing, external exposure curing, and oven curing at $60^{\circ}C$. The beams were experimentally tested at the 28th day of casting after curing by conducting two-point loading flexural test. Performance aspects such as load carrying capacity, first crack load, load-deflection and moment-curvature behaviours of both types of beams were experimentally studied and their results were compared under different curing conditions. To verify the response of reinforced GPC beams numerically, an ANSYS 13.0 finite element program was also used. The result shows that there is a good agreement between computer model failure behaviour with the experimental failure behaviour.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
• /
• pp.1004-1011
• /
• 2008

In this study, obtained large block sample and piston sample of marine clay in korea were performed unconfined compression and consolidation test. Soil properties of two type samples such as failure strain, between two parameter's ratio($E_{50}$ and $q_u$), and volumetric strain were used to evaluate sample disturbance. The result, large block samples show a low disturbance than piston samples. Therefore, we suggest new sample disturbance evaluated method through the relation of OCR and volumaric strain at shallow of marine clay in Korea and suggest new sample disturbance classified method by subdivided grade for failure strain of unconfined compression test.

• 산업경영시스템학회지
• /
• 제31권4호
• /
• pp.162-167
• /
• 2008

FMEA (failure mode and effect analysis)is a widely used technique to assess or to improve reliability of product not only at early stage of design and development, but at the process and service phase during the product life cycle. In designing a service system, this study proposes a fuzzy service FMEA with the service blueprints as a tool which describes customer actions, onstage contact employees actions, backstage contact employees actions, support processes, and physical evidences, in order to analyse and inform service delivery system design. We fuzzified only two risk factors, occurrence and severity, to more effectively assess the potential failure modes in service. Proposed fuzzy risk grades are applied to Gaussian membership function, defuzzified into Fuzzy Inference System, and eventually identified the ranks on the potential fail points.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
• /
• pp.33-36
• /
• 2004

The current Korea bridge design specifications have no provisions about concrete Barrier. And there are no test results of registence strength of the concrete barrier at the vehicle collision sites. This paper reports experimental results of concrete barrier on bridge deck conctructed by standard drawing of SB5 grade. Eight specimens were tested under static test. The specimens are divided by two groups (D-series and B-series). D-series is to show failure pattern of bridge deck. B-series is to show failure pattern of concrete Barrier. The test results compared with calculation results using Yield-Line theory of AASHTO LRFD Bridge Design Specifications.

• International Journal of Contents
• /
• 제13권4호
• /
• pp.29-38
• /
• 2017

The objective of this study was to determine the status of current chapel courses and analyze the necessity of online chapel courses. Students' interest, failure experience, perceived problems, and advantages of current chapel courses were examined. Students' preference, intention of sincerity, and perceived effectiveness of online chapel courses were also determined. Finally, hypothesis tests for the differences of students' interest, failure experience, perceived problems and advantages of current chapel courses, preference, intention of sincerity, and perceived effectiveness of online chapel courses according to gender, school year grade, major of study, and religion were performed. Students' low interest in chapel courses was verified. Even Christian students' interest was below 3 points out of 5-point Likert scale. However, students whose religion was not Christianity felt more coercion and had less interest in chapel courses. They wanted virtualization of chapel courses more. They had more willingness to faithful participation in online chapel courses. This research suggests that virtualization of chapel courses as a solution to chapel resistance is dependent on student's characteristics such as religion, major field of study, and mindset.