• Journal of Ship and Ocean Technology
• /
• 제1권1호
• /
• pp.1-14
• /
• 1997

Hydroelastic slamming against the wetdeck of a multihull vessel is studied numerically and experimentally. The beam equations and a two-dimensional flow model are used to find the dynamic stresses in longitudinal stiffeners between two transverse stiffeners. The largest stresses in the structure occur in the time scale of the lowest wet natural period of the beam. A simple relation between the maximum stress, the local geometry and the impact velocity of the wetdeck is established. The stresses in the wetdeck are neither sensitive to the radius of curvature of the waves nor where the waves initially hit the wetdeck. It is concluded that the maximum impact pressure should not be used to find maximum bending stresses during wetdeck slamming.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2006년도 전기학술대회논문집
• /
• pp.287-288
• /
• 2006

Cracks on the cylinder block of diesel engines will often happen due to cyclic load and thermal stress. According to the Classification Societies' rules, welding repairs of cylinder block made of cast irons are generally not permitted. However, such welding repairs became inevitable taking enormous cost and time for their renewal into consideration. In this study repair welding methods for the cylinder blocks, made of gray cast irons were reviewed and the tests of their welds were carried out in order to purpose the repair welding methods of packing seat and o-ring seat of cylinder block and apply them to the practice. It is concluding remarks that the suspected crack by a magnetic particle test due to different magnetic permeability can be identified, which are not associated with a mechanical discontinuity.

• 동의신경정신과학회지
• /
• 제1권1호
• /
• pp.21-38
• /
• 1990

In this study, the bibliographic classification, pathogeny, symptoms, therapeutics and prescriptions of Talyoung-Siljeong(脫營失精) were researched. Reference to consult about its origin and the process of development showed the following results. 1. It was 1117 that the difference between Talyoung-Siljeong(脫營失精) began to appear for the first time in classical literatures. 2. In view of psychological side, it is suitable for siljeong(失精), the part of Talyoung-Siljeong(脫營失精), to be called Taljeong(脫精). 3. Taljeong-Siljeong(脫營失精) was broken out by the internal factors. 4. Silyoung(失營) and Silyoung jeo(失營疽) are the worse states of Talyoung(脫營) and result in the incurable diseases. 5. Hypochondria and diaster psychology can be cured by the therapeutics of Talyoung-Siljeong(脫營失精). 6. Prescription for Heoro-Talyoung(虛勞脫營) can be used in cure of Talyoung(脫營). Talyoung-Siljeoung(脫營失精) remarked in traditional oriental meicine is recognized to belong to the part of stress in mordern medicine. It is thought that the experimental investigation should be continued.

• 한국자동차공학회논문집
• /
• 제22권2호
• /
• pp.134-140
• /
• 2014

The paper presents an overview of the present state of study on the fatigue behaviors at very high number of cycles ($N_f$ > $10^7$). A classification of materials with typical S-N curves and influencing factors such as notches, residual stresses, temperatures, corrosion environments and stress ratios are given. The microstructural inhomogeneities of materials and micro-cracks played an important roles in very high cycle fatigue behaviors. The failure mechanisms for the fatigue design of materials and components are mentioned.

• 대한음성학회지:말소리
• /
• 제31_32호
• /
• pp.195-205
• /
• 1996

The aim of this paper is to describe the prosodic structure of Korean related to the syllable duration varying with its positional difference. An attempt is made in this study to analyze and describe the concrete correlation between the syllable lengthening and its position in the utterance at the initial and final positions. Using the syllable [na] at the final and initial position of a prosodic phrase in the Korean version of 'the North Wind and the Sun', it has found that the ratio of phrase final versus phrase initial syllable lengthening was approximately 1.8:1 for 4 subjects taking part in the test. In the case of nonsense data, we found that the ratio was approximately 1.6:1 for 2 out of 3 subjects. The results of this study might indicate that Korean tends to have a high rate of final lengthening. We can tentatively classify it, therefore, as a stress-timed language. Still, there is no denying that further studies should be done before we can be absolutely certain about the classification of languages along the dichotomy scale.

• Toxicological Research
• /
• 제22권4호
• /
• pp.323-328
• /
• 2006

Global gene expression profile was analyzed by microarray analysis of rat liver RNA after acute acetaminophen (APAP) administration. A single dose of 1g/kg body weight of APAP was given orally, and the liver samples were obtained after 24, 48 h, and 2 weeks. Histopathologic and biochemical studies enabled the classification of the APAP effect into injury (24 and 48 h) and regeneration (2 weeks) stages. The expression levels of 4900 clones on a custom rat gene microarray were analyzed and 484 clones were differentially expressed with more than a 1.625-fold difference(which equals 0.7 in log2 scale) at one or more time points. Two hundred ninety seven clones were classified as injury-specific clones, while 149 clones as regeneration-specific ones. Characteristic gene expression profiles could be associated with APAP-induced gene expression changes in lipid metabolism, stress response, and protein metabolism. We established a global gene expression profile utilizing microarray analysis in rat liver upon acute APAP administration with a full chronological profile that not only covers injury stage but also later point of regeneration stage.

• 대한조선학회지
• /
• 제1권1호
• /
• pp.3-8
• /
• 1964

The classification society rules [1], [2], [3], [4] on the thicknesses of the bulkhead platings are represented graphically. Fig. 1 shows that every rule value for the thickness of the ordinary watertight bulkhead plating is than theoretical value calculated by Timoshenko's formula (1) for ${\sigma}_y=35,000$ psi and ｋ=0.4998. When a flooding due to damage occurred, however, the stiffened edges would yield and clamped edges would change to plastic hinges. In such case, the maximum bending stress at the clamped edges are reduced considerably. The rule values, therefore, are supposed to be acceptable in spite of their insufficient scantlings compared with the values calculated by (2). In the ordinary watertight bulkhead platings A.B.S. Rules give the largest scantlings of all. Fig. 2 shows that A.B.S. Rules and K.R.-N.K. Rules give larger values than the calculated by (2) for deep tank bulkhead platings. But Lloyd Rules give the smaller thickness than equation (2). The special requirements for corrosion bulkhead platings are not studied here.

• 아동학회지
• /
• 제19권1호
• /
• pp.5-25
• /
• 1998

Korean proverbs concerning parent child relationships were collected from literature. 95 proverbs were selected for this study. The proverbs were categorized by meaning; value of child, affection toward child, boy-preference, positive-negative affection coward daughter, importance of child's education, child-rearing stress, identification of parent, authoritative control, and filial piety. The subjects (223 married men and 224 married women) were asked to indicate their understanding of the meaning of the proverbs. The degree of agreement was analyzed. The results revealed variability in their understanding and the high degree of agreement on the proverbs. Demographic variables, age, educational level, and religion, appeared to be the important factors in the subjects' agreement.

• 대한조선학회논문집
• /
• 제29권3호
• /
• pp.157-165
• /
• 1992

본 연구에서는 굽힘을 받는 평판의 특성을 다루었으며 평판중 특히 수밀 격벽판 및 디프탱크 격벽판에 대하여 각 선급의 강선 규칙에서 규정하고 있는 규정식의 이론적 배경에 대하여 해석하고, 각 선급의 강선규칙에서 규정하고 있는 격벽판에 대한 설계 규정식을 비교검토한 후 모델 선박을 선정하여 격벽판에 대한 3차원 상세구조해석을 실시하여 선급규정식의 적용범위를 밝힘으로서 새로운 규정식의 방향을 제시하였다.

• Journal of Species Research
• /
• 제9권1호
• /
• pp.68-76
• /
• 2020

We identified 22 ciliate species, including five unrecorded ciliate species, from temporary ponds on a grass lawn. The five unrecorded species are as follows: class Nassophorea - Pseudomicrothorax agilis Mermod, 1914, Nassula exigua Kahl, 1931, class Colpodea - Cyrtolophosis mucicola Stokes, 1885, Maryna ovata (Gelei, 1950) Foissner, 1993, and class Spirotrichea - Meseres corlissi Petz & Foissner, 1992. Most of these 22 ciliate species disappeared from a raw culture within a few days (probably encystment), and a few cells were available from some species that resulted in incomplete identifications (e.g., genus-level). About the unrecorded five ciliate species, they are small in size (<60 ㎛ in vivo), and two of them live in a hyaline dwelling-tube, which is easily deserted by a cell with a stress. Their taxonomic classification is summarized as three classes, five orders, five families, and five genera. Here, we provide brief descriptions, micrographs of their morphology, and some remarks.