• Title/Summary/Keyword: damage history

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Life History, Ginseng Damage and Chemical Control of the Field Slug, Deroceras varsans A, Adams (들민달팽이의 생활사와 인삼의 피해 및 약제 방제)

  • 김기황;오승환
    • Journal of Ginseng Research
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    • v.14 no.3
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    • pp.421-426
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    • 1990
  • Field and laboratory works were conducted to Investigate the life history, ginseng damage and chemical control effect of the field slug, Deroceras varians A. Adams. D. varians laid eggs from April to June, but a small number of eggs were also found from July to September in the field. Most young slugs grew through the slimmer months to maturity by October. overwintered beneath the moist soil surface, and began feeding and egg-laying in the following April. indicating that D varians have a life cycle in a year. Damage of ginseng plants by D. varina occurred mainly from late April to mid May in the 3rd to 5th year ginseng fields with rice-straw mulching. It seems that this damage is caused by the adults in oviposition periods and related to rice-straw mulching of ginseng fields. In the experiment, ethoprop 5% granule and metaldehyde 6% bait showed relatively high effectiveness in the control of D. varians adults. Bordeaux mixture was more effective when the chemical was sprayed after infestation of the slug than before the infestation and when the 6-12 mixture was used.

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Structural Durability Analysis of Tie Rod (타이로드의 구조적 내구성 해석)

  • Han, Moon-Sik;Cho, Jae-Ung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.68-75
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    • 2012
  • This study aims at the structural analysis of vibration and fatigue according to the tie rod configuration. The maximum displacement amplitude is happened at 156Hz by harmonic vibration analysis, this tie rod model can be broken as the weakest state. Among the cases of nonuniform fatigue loads, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sine wave' becomes most stable. In case of 'Sine wave' with the average stress of 0MPa and the amplitude stress of 570MPa, the possibility of maximum damage becomes 70%. This stress state can be shown with 140 times more than the damage possibility of 'SAE bracket history' or 'SAE transmission'. The structural result of this study can be effectively utilized with the design on tie rod by investigating prevention and durability against its damage.

The research on the reference books of 「the chapter of First symptom(初證)」 in 『The Part of Cold damage in Uihakipmun(醫學入門·傷寒編)』 (『의학입문(醫學入門)·상한편(傷寒篇)』 중(中) 「초증(初證)」의 인용서(引用書)에 대한 연구(硏究))

  • Kim, Sang-Un
    • The Journal of Korean Medical History
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    • v.27 no.1
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    • pp.87-112
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    • 2014
  • Purpose : "The Part of Cold damage in Uihakipmun" is the collection of the books on Cold damage which follow the way of description focusing on symptoms before Ming dynasty. "The chapter of First symptom" in this part is the first chapter which described focusing on the symptoms in earnest. This research is to discover the reference books of "The chapter of First symptom" in detail. Methods : I compared the books presented in the reference list of "The Part of Cold damage in Uihakipmun" with the sentences of "The chapter of First symptom". Results & Conclusions : "The chapter of First symptom" referred to "Sanghanyukseo(傷寒六書)" and "Injaesanghanryuseo(仁齋傷寒類書)" mainly, and the rest were supplemented with other books like "Hwalinseo(活人書)". And the books which were not listed on the reference like "Sanghanmyeongriron(傷寒明理論)", "Yupyeonhwalinseogwaljijangdoron(類編活人書括指掌圖論)" were also referred in part. Among the reference list of "The Part of Cold damage in Uihakipmun", "Baekmun(百問)" doesn't indicate "Sanghanbaekmun(傷寒百問)" but "Sanghanbaekmunga(傷寒百問歌)". As for the history of the books on cold damage which described focusing on symptoms, "Injaesanghanryuseo" added new contents on the basis of "Hwalinseo" and after that, it had a large influence on "Sanghanyukseo" and "The Part of Cold damage in Uihakipmun". In case of 33.4% of the chapter of first symptom, the reference books were not found. It includes the part that the reference books were not found and also the part that Lee Cheon added his personal opinion. For this parts, the in-depth study is needed afterwards.

Characteristic of Temperature History of Slab concrete by the Change of Insulation Curing Material and Difference of Heated cable Power Capacity. (단열양생재 변화 및 열선 전력용량 차이에 따른 슬래브 콘크리트의 온도이력 특성)

  • Jung, Eun-Bong;Ahn, Sang-Ku;Jung, Sang-Hyun;Koh, Kyung-Taek;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.334-336
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    • 2013
  • In this study, the temperature history was evaluated for the improved bubble sheets combining hot wires and PE films, which were developed under the extreme environmental condition of -10℃ and applied on the top surface of slab to prevent initial damage by freezing. Results can be summarized as follows. If improved bubble sheets combining hot wires with different capacity on double and quadruple bubble sheets are used, the temperature history for all materials decreased to 2~3℃ below zero but all test materials except Type 1 secured the accumulative temperature of 45° D·D at 7 days of material age, required for the prevention of initial freezing damage. This indicates the bubble sheets can prevent the initial damage by freezing.

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A Study on the Damage of the Three Storied Stone Pagoda of Bulguksa Temple in GyeongJu (경주 불국사 삼층석탑(석가탑) 파손원인에 관한 연구)

  • Ji, Sung-Jin
    • Journal of architectural history
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    • v.22 no.6
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    • pp.47-58
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    • 2013
  • The purpose of this study is to analyze the cause of damage to the three storied stone pagoda of Bulguksa temple in GyeongJu. This report is attempted to making reinforcement and conservation plan through investigating and analyzing the cause of damage to that. The damage is caused by occurring of stress, degrading of stone strength, changing of underground soil structure, natural disasters and so on. Compressive stress, shear stress, bending stress and lateral pressure affected to the pagoda since built up. Ultrasonic examination data tells the strength of the stone. According to this result, strength of the stereobate stone materials is enough to support the weight of the upper ones. But we could found many other factors of the damage could consider, for example the problems occurred on building the pagoda construction and the weakness of the stone material(soft rock). And many environmental factors being changed in soil structure(subsidence of soil and degradation of bearing power of soil and freezing and melting of soil) can be seen as the cause of the damage. Natural disasters like earthquake, lightning and heavy rain were also thought to give direct impact to the damage. At last Concentration of compressive stress caused the crack and exfoliation on the stone materials and shear stress, bending stress and lateral pressure were main causes of the stereobate stone materials shearing.

Evaluation of scalar structure-specific ground motion intensity measures for seismic response prediction of earthquake resistant 3D buildings

  • Kostinakis, Konstantinos G.;Athanatopoulou, Asimina M.
    • Earthquakes and Structures
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    • v.9 no.5
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    • pp.1091-1114
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    • 2015
  • The adequacy of a number of advanced earthquake Intensity Measures (IMs) to predict the structural damage of earthquake resistant 3D R/C buildings is investigated in the present paper. To achieve this purpose three symmetric in plan and three asymmetric 5-storey R/C buildings are analyzed by nonlinear time history analysis using 74 bidirectional earthquake records. The two horizontal accelerograms of each ground motion are applied along the structural axes of the buildings and the structural damage is expressed in terms of the maximum and average interstorey drift as well as the overall structural damage index. For each individual pair of accelerograms the values of the aforementioned seismic damage measures are determined. Then, they are correlated with several strong motion scalar IMs that take into account both earthquake and structural characteristics. The research identified certain IMs which exhibit strong correlation with the seismic damage measures of the studied buildings. However, the degree of correlation between IMs and the seismic damage depends on the damage measure adopted. Furthermore, it is confirmed that the widely used spectral acceleration at the fundamental period of the structure is a relatively good IM for medium rise R/C buildings that possess small structural eccentricity.

A Study on the Prediction of the Fatigue Life of a Lug through the Finite Element Analysis (FEA를 이용한 Lug의 피로 수명 평가에 관한 연구)

  • 이원석;이현우
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.88-95
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    • 1998
  • The purpose of this study is to predict the life of a Lug under the real service load history. The techniques of predicting a fatigue life under load spectrum are discussed and some are developed. The stress is calculated by multiplying the stress under unit force with the Finite Element Analysis. The cycles are counted by the Rainflow counting method and then the mean stress effect is considered by the suggested conversion function. The Manson's Double Linear Damage Rule is used as the cummulative damage method.

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Assessment of the Degree of Fatigue Damage in Steel Plate-Girder Railway Bridges According to Span Length (지간장에 따른 강판형 철도교의 피로피해도 평가)

  • Jung, Young-Hwa;Kim, Ik-Gyeom;Kim, Ji-Hun;Nam, Wang-Hyone
    • Journal of Industrial Technology
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    • v.19
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    • pp.313-320
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    • 1999
  • Steel railway bridge gets vibration from moving load ; additionally, this kind of moving load is going to be a sufficient reason, which causes fatigue damage to steel railway bridge. Fatigue damage and stress curve were raised by moving load depends on span length in steel railway bridge. In other words, stress curve appears index regarding every axial load in short span, but self weight lets stress curve's change decrease in proportion to increasing span length. Thereby, we have studied that how the steel railway bridge appear fatigue damage in proportion to span length of steel railway bridge. Dynamic strain was measured in 4 steel plate-girder railway bridge during the trains was passing, which is located on the line of Kyoung-chun railway. And time history response analysis has been done in order to ensure actual survey. The results of this study show the decreased of the fatigue damage in steel railway bridge according to length of span. This paper ends is bases research of fatigue design in steel railway bridges according to span length.

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A Literary Study on the Management of the JeongJaGak(丁字閣, T shaped building) of the Joseon Royal Tombs in the Late Joseon Dynasty - Focusing on the JeongJaGak damage record of Gakneung Suri Deungnok(Records relating to the repair of royal tombs, 1675-1713) - (조선 후기 왕릉 정자각 관리에 대한 문헌적 고찰 -『각릉수리등록(各陵修理謄錄, 1675-1713년)』의 정자각 훼손기록을 중심으로-)

  • Hong, Eun-Ki;Hwang, Jong-Kook;Chang, Hun-Duck
    • Journal of architectural history
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    • v.32 no.2
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    • pp.37-48
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    • 2023
  • A literature study was conducted on the management of the pavilion of the royal tomb in the late Joseon Dynasty, focusing on "Gakneung Suri Deungnok(Records relating to the repair of royal tombs)". This study analyzed the royal tomb management system, organized the types of damage identified in the building, and examined how the damage status was recorded by type. In the above, the records related to the 1675~1713 repair of three JeongJaGak(Geonwonneung, Sungneung, and Mokneung), which are registered as state-designated cultural properties, are summarized in three aspects: management system, damage status, and expression words. The results of the study are as follows. First, the royal tomb pavilion was regularly inspected by Observator(觀察使) in spring and autumn, and Surunggwan(守陵官) every 5th, and Servant(守僕) regularly inspected every day and night, and also inspected and reported emergency cases of natural disasters or unexpected damage. Second, the damage status of each building was continuously observed and reported for the continuous maintenance of the buildings in the royal tomb. A total of 75 records of damage to the three royal tombs' pavilion were found to have been most frequently inspected, including 19 cases (25.3%), 14 cases (18.7%), 23 cases (30.7%) of the roof, and 19 cases (25.3%) of the roof. Third, the expression of the damage status is confirmed in various ways, such as separation, separation, burst, damage, excitation, moisture, leakage, and exfoliation. Among them, the main damage records were confirmed due to the separation of the base from the peeling, the furniture, cracks, leaks, leaks in the roof, and the collapse of the roof was able to check the damage records.

A Study on Cold Damage(傷寒) in the Compendium of Prescription from the Countryside(鄕藥集成方) - Focusing on citation, medical theory, prescription, medicinal herbs - (조선 의서 『향약집성방』 중에 실린 상한(傷寒) 논의 연구 - 인용 문헌, 의론(醫論), 처방, 본초 등을 중심으로 -)

  • Oh, Chae-Kun
    • The Journal of Korean Medical History
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    • v.25 no.2
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    • pp.121-136
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    • 2012
  • The purpose of this paper is to derive the features of cold damage clinical medicine during the early days of the Chosun(朝鮮) period by analyzing discussions on cold damage published in the official medical book of the Chosun period, Compendium of Prescription from the Countryside(鄕藥集成方, CPC). Cold damage was one of the typical diseases in East Asia where there was constant seeking of the utilization of prescriptions, ways of preparations, and awareness regarding cold damage as shown in Zhang, Zhongjing(張仲景)'s Treatise on Cold Damage Disease(傷寒論, TCDD) below. Traditional Korean medicine which possessed the medical universality of East Asia also was no exception and through an analysis of the part on cold damage in CPC, it is expected that medical features of cold damage in Korea passed down from the Koryo(高麗) Dynasty to the early Chosun period will be revealed. For this, first there needs to be an organization of past discussions on cold damage surrounding the existence of infection and after checking the issues, exploring which of the writings related to TCDD and editions are being utilized through an analysis on citing literature of Cold Damage Disease Literature(傷寒門) and Heat Pathogen Disease Literature(熱病門) which have developed discussions on cold damage in CPC. In addition, by comparing Peaceful Holy Benevolent Prescription(太平聖惠方, PHBP) and Complete Record of Sacred Benevolence(聖濟總錄, CRSB), known to have greatly influenced CPC and Cold Damage Literature and Heat Pathogen Disease Literature, features of form and content used by CPC were analyzed. Features of form were examined through pattern of organization and number of citing literature were examined and for features of content, cold damage infection, classification, syndrome differentiation method, and utilization of materia medica among prescriptions were examined. Discussions on cold damage as being uninfectious as stated in Treatise on the Pathogenesis and Manifestations of All Diseases(諸病源候論) unlike pestilence, epidemic pathogen(時氣), warm pathogen disease(溫病), and heat pathogen disease were excluded in PHBP. PHBP opened the possibility of cold damage infection and later writings, CRSB and CPC also follow this. As a result of analyzing citing literature of the part on cold damage in CPC, it is uncertain which edition of TCDD is being utilized; however, the most distinctive feature was that Classified Emergency Materia Medica(證類本草) and not writings specializing in cold damage are in use. In general, although CPC in terms of form is similar to CRSB, content creation predominantly depended on PHBP. More specifically; first, in terms of the existence of cold damage infection, arguments of PHBP and CRSB are maintained. Second, in terms of cold damage classification, although CRSB is followed, heat pathogen disease is classified separately developing PHBP as is. Third, in terms of method, as Book of Keep Healthy(南陽活人書) and CRSB compiled in later times are cited, it is deemed that arguments were raised to a certain extent regarding six-meridian syndrome differentiation(六經辨證). Fourth, although the majority of utilized materia medica among cold damage prescriptions utilize Materia Medica from the Countryside(鄕藥本草) in CPC and materia medica from Korean Peninsula, this is due to the desire for the compilation performance of CPC to be propagated to ordinary citizens and not the ruling class. CPC as the official medical book compiled in the early days of the Chosun period was greatly influenced by the Song(宋) Dynasty's medical books, PHBP and CRSB shows that cold damage medicine in the early Chosun Period indeed possesses the medical universality of East Asia. Furthermore, the features of published medical theory and prescriptions reveal the existence of the cold damage medical tradition of the Chosun period serving as clues for cold damage research tradition among Korea's medical history.