• 제목/요약/키워드: 4-BAR

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수목(樹木)의 수분특성(水分特性)에 관한 생리(生理)·생태학적(生態學的) 해석(解析(IV) - 몇 종(種)의 침엽수(針葉樹)에 있어서 Leaf Conductance와 Water Potential, 상대함수율(相對含水率), 팽압(膨壓)과의 관계(關係) - (Ecophysiological Interpretations on the Water Relations Parameters of Trees (IV) - Relation between Leaf Conductance and Water Potential, Relative Water Content, and Turgor Pressure in Several Conifers -)

  • 한상섭;전두식
    • 한국산림과학회지
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    • 제63권1호
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    • pp.28-34
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    • 1984
  • 본연구(本硏究)는 몇 종(種)의 침엽수(針葉樹)의 지엽(枝葉)에 있어서 P-V 곡선법(曲線法)에 의해 얻은 수분특성인자(水分特性因子)와 기공폐쇄작용(氣孔閉鎻作用)과의 관계(關係)를 측정고찰(測定考察)한 것으로 그 결과(結果)는 다음과 같다. 1. P-V 곡선법(曲線法)에 의해 구(求)한 초기원형질리점(初期原形質離點)의 water potential 값과 완전기공폐쇄점(完全氣孔閉鎻點)의 water potential 값은 거의 일치(一致)하였다. 2) 완전기공폐쇄점(完全氣孔閉鎻)는 잣나무 -21 bar(음엽(陰葉) -17 bar), 리기다 -20 bar, 소나무 -22 bar, 일본잎갈나무 -24 bar 전후(前後)에서 일어났다. 상대함수율(相對含水率)로 나타내면 잣나무 85%(음엽(陰葉) 82%), 리기다 77%, 소나무 85%, 일본잎갈나무 70% 전후(前後)에서 완전기공폐쇄(完全氣孔閉鎻)가 일어났다. 3. 초기기공폐쇄(初期氣孔閉鎻)는 잣나무 -14 bar(음엽(陰葉) -12 bar), 리기다 -10 bar, 소나무 -15 bar, 일본잎갈나무 -6 bar 전후(前後)에서 일어났다. 상대함수율(相對含水率)로 나타내면 잣나무 90%, 리기다 93%, 소나무 90% 일본잎갈나무 93% 전후(前後)에서 초기기공폐쇄(初期氣孔閉鎻)가 일어났다. 4. leaf conductance가 증가(增加)함에 따라 팽압(膨壓)은 증가(增加)하며, 상대함수율(相對含水率)이 증가(增加)함에 따라 팽압(膨壓)은 직선적(直線的)으로 증가(增加)하였다.

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Fusarium moniliforme의 Propagule형성(形成)과 발아(發芽)에 미치는 Water Potential의 효과(效果) (Effect of Water Potential on Mycelial Growth, Reproduction and Spore Germination by Fusarium moniliforme)

  • 성재모;이은종;박종성
    • 한국균학회지
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    • 제12권3호
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    • pp.99-103
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    • 1984
  • Fusarium moniliforme strain별 균사신장(菌絲伸長)은 Strain IV은 water agar나 PDA에 관계(關係)없이 -14 bars에서 좋았고 -80 bars에서도 균사(菌絲)자람이 정지되지 않았다. Strain II와 Strain IV 를 비교(比較)하여보면 Strain II가 Strain IV보다 각 water potential 에서 균사(菌絲)자람이 좋았다. 분생포자형성(分生胞子形成)은 Strain에 관계(關係)없이 소형분생포자(小型分生胞子)는 0에서 -20bars까지는 점점(漸漸) 형성(形成)이 증가(增加)하다가 -20bars에서 가장 많이 형성(形成)되었으며 -80bars에서도 아주 적은수이지만 형성(形成)이 되었다. 대형분생포자(大型分生胞子)는 -1.4bars에서 포자형성(胞子形成)이 잘 되었고 water potential 떨어짐에 따라 -32bars에서 대형분생포자(大型分生胞子)를 형성(形成)하지 않고 소형분생포자(小型分生胞子)만 형성(形成)하였다. 포자발아(胞子發芽)는 -1.4bars에서 발아율(發芽率)이 좋았고 water potential이 떨어질수록 발아율(發芽率)도 떨어졌다.

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임플란트의 수와 어태치먼트의 종류에 따른 하악 임플란트 지지 오버덴춰의 삼차원 광탄성 응력분석 (A THREE DIMENSIONAL PHOTOELASTIC STRESS ANALYSIS OF IMPLANT-SUPPORTED MANDIBULAR OVERDENTURE ACCORDING TO IMPLANT NUMBER AND ATTACHMENT TYPE)

  • 한상훈;태윤섭;진태호;조혜원
    • 대한치과보철학회지
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    • 제35권3호
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    • pp.577-608
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    • 1997
  • The purpose of this study is to evaluate the stress distribution in the bone around dental implants supporting mandibular overdenture according to the number of implant and the type of attachment. Two or four implants were placed in an edentulous mandibular model and three dimensional photoelastic stress analysis was carried out to measure the fringe order around the implant supporting structure and also to calculate principal stress components at cervical area of each implant. The attachments tested were rigid and resilient type of Dolder bar, Round bar, Hader bar and Dal-Ro attchment. The results were as follows ; 1. In 2-implant supported overdenture using Round bar, Hader bar, and Dal-Ro attachment, compressive stress pattern was observed on the supporting structure of implant on loaded side, while tensile stress pattern in unloaded side. 2. In 2-implant supported overdenture using Dolder bar, the rigid Dolder bar shared the occlusal loads between 2 implants in a more favorable manner than was exhibited by the resilient type, while the resilient type placed a more stress on the distocervical area of the implant on the loaded side. But compressive stress pattern was observed in both the loaded and unloaded sides in either case. 3. In 2-implant supported overdenture, rigid and resilient type of Dolder bar exhibited more cross arch involvement than the Round bar, Hader bar, or Dal-Ro attachment. 4. In 4-implant supported overdenture using resilient Dolder bar and Hader bar, stress turned out to be distributed evenly among the implants between loaded and unloaded side, but thor was no reduction in the magnitude of the stress in the surrounding structure of implant contratry to 2-implant supported overdenture. 5. The stress pattern at cervical area of implant was different with the number of implant or the type of attachment but the overload, harmful to surrounding structure of implant, was not observed.

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상악 임플랜트 Overdenture에서 Bar Attachment 설계에 따른 유지력 변화에 관한 연구 (COMPARATIVE STUDIES OF RETENTIVE FORCES IN MAXILLARY OVERDENTURE BAR ATTACHMENTS)

  • 손차영;정창모;전영찬;임장섭;정희찬
    • 대한치과보철학회지
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    • 제43권5호
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    • pp.650-661
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    • 2005
  • Statement of problem: It could be hypothesised that attachments, which provide more retention against vortical and horizontal dislodgement, will be associated with more favorable parameters of oral function. Purpose: This study was to provide data of initial retentive force and retention loss of different bar attachment systems recommended for use with maxillary implant overdentures. Material and method: 4 implants were placed in the anterior region of edentulous maxilla, five different systems of bar attachment were fabricated as follows: cantilevered Hader bar using clips (Type 1), Hader bar using clips without cantilever (Type 2), Hader bar using clip and ERA attachment orange male (Type 3), Hader bar using clip and ERA attachment white male (Type 4), and Bar using magnets (Type 5). Each samples were placed in the universal testing machine for determination of retentive forces(at initial and after every 200 cycles up to 1,000 cycles). Results and Conclusion 1. Attachment type 1 showed the biggest initial retentive force followed by type 3, type 2, type 4, and lastly type 5(P<0.001). 2. After 1,000 cycles of repeated removals of attachments, significant loss of retentive forces was taken place except for attachment type 5. 3. After 1,000 cycles of repeated removals, the loss of retentive force between type 1 and type 2, which used Hader bar and clip attachments. was greater in type 1 that had wider clip formation. And between type 3 and type 4, which used ERA attachments, the loss of retentive force was greater in type 4 that had white male attached (P<0.001). 4. After 1.000 cycles of repeated removals, attachment type 3 showed the biggest retentive force followed by type 2, type 4, type 1 and lastly type. 5. There was no significant difference between attachment type 3 and 4, and type 4 and 1(P<0.001).

'아유르베다'($\bar{A}yurveda$)의 의경(醫經)에 관한 연구 (A Study of The Medical Classics in the '$\bar{A}yurveda$')

  • 김기욱;박현국;서지영
    • 대한한의학원전학회지
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    • 제20권4호
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    • pp.91-117
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    • 2007
  • Through a simple study of the medical classics in the '$\bar{A}yurveda$', we have summarized them as follows. 1) Traditional Indian medicine started in the Ganges river area at about 1500 B. C. E. and traces of medical science can be found in the "Rigveda" and "Atharvaveda". 2) The "Charaka" and "$Su\acute{s}hruta$(妙聞集)", ancient texts from India, are not the work of one person, but the result of the work and errors of different doctors and philosophers. Due to the lack of historical records, the time of Charaka or $Su\acute{s}hruta$(妙聞)s' lives are not exactly known. So the completion of the "Charaka" is estimated at 1st${\sim}$2nd century C. E. in northwestern India, and the "$Su\acute{s}hruta$" is estimated to have been completed in 3rd${\sim}$4th century C. E. in central India. Also, the "Charaka" contains details on internal medicine, while the "$Su\acute{s}hruta$" contains more details on surgery by comparison. 3) '$V\bar{a}gbhata$', one of the revered Vriddha Trayi(triad of the ancients, 三醫聖) of the '$\bar{A}yurveda$', lived and worked in about the 7th century and wrote the "$A\d{s}\d{t}\bar{a}nga$ $A\d{s}\d{t}\bar{a}nga$ $h\d{r}daya$ $sa\d{m}hit\bar{a}$ $samhit\bar{a}$(八支集)" and "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$(八心集)", where he tried to compromise and unify the "Charaka" and "$Su\acute{s}hruta$". The "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$" was translated into Tibetan and Arabic at about the 8th${\sim}$9th century, and if we generalize the medicinal plants recorded in each the "Charaka", "$Su\acute{s}hruta$" and the "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$", there are 240, 370, 240 types each. 4) The 'Madhava' focused on one of the subjects of Indian medicine, '$Nid\bar{a}na$' ie meaning "the cause of diseases(病因論)", and in one of the copies found by Bower in 4th century C. E. we can see that it uses prescriptions from the "BuHaLaJi(布哈拉集)", "Charaka", "$Su\acute{s}hruta$". 5) According to the "Charaka", there were 8 branches of ancient medicine in India : treatment of the body(kayacikitsa), special surgery(salakya), removal of alien substances(salyapahartka), treatment of poison or mis-combined medicines(visagaravairodhikaprasamana), the study of ghosts(bhutavidya), pediatrics(kaumarabhrtya), perennial youth and long life(rasayana), and the strengthening of the essence of the body(vajikarana). 6) The '$\bar{A}yurveda$', which originated from ancient experience, was recorded in Sanskrit, which was a theorization of knowledge, and also was written in verses to make memorizing easy, and made medicine the exclusive possession of the Brahmin. The first annotations were 1060 for the "Charaka", 1200 for the "$Su\acute{s}hruta$", 1150 for the "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$", and 1100 for the "$Nid\bar{a}na$", The use of various mineral medicines in the "Charaka" or the use of mercury as internal medicine in the "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$", and the palpation of the pulse for diagnosing in the '$\bar{A}yurveda$' and 'XiZhang(西藏)' medicine are similar to TCM's pulse diagnostics. The coexistence with Arabian 'Unani' medicine, compromise with western medicine and the reactionism trend restored the '$\bar{A}yurveda$' today. 7) The "Charaka" is a book inclined to internal medicine that investigates the origin of human disease which used the dualism of the 'Samkhya', the natural philosophy of the 'Vaisesika' and the logic of the 'Nyaya' in medical theories, and its structure has 16 syllables per line, 2 lines per poem and is recorded in poetry and prose. Also, the "Charaka" can be summarized into the introduction, cause, judgement, body, sensory organs, treatment, pharmaceuticals, and end, and can be seen as a work that strongly reflects the moral code of Brahmin and Aryans. 8) In extracting bloody pus, the "Charaka" introduces a 'sharp tool' bloodletting treatment, while the "$Su\scute{s}hruta$" introduces many surgical methods such as the use of gourd dippers, horns, sucking the blood with leeches. Also the "$Su\acute{s}hruta$" has 19 chapters specializing in ophthalmology, and shows 76 types of eye diseases and their treatments. 9) Since anatomy did not develop in Indian medicine, the inner structure of the human body was not well known. The only exception is 'GuXiangXue(骨相學)' which developed from 'Atharvaveda' times and the "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$". In the "$A\d{s}\d{t}\bar{a}nga$ Sangraha $samhit\bar{a}$"'s 'ShenTiLun(身體論)' there is a thorough listing of the development of a child from pregnancy to birth. The '$\bar{A}yurveda$' is not just an ancient traditional medical system but is being called alternative medicine in the west because of its ability to supplement western medicine and, as its effects are being proved scientifically it is gaining attention worldwide. We would like to say that what we have researched is just a small fragment and a limited view, and would like to correct and supplement any insufficient parts through more research of new records.

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Bar code 활용기술 분석

  • 김정호;박중무;이대기
    • 전자통신동향분석
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    • 제4권4호
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    • pp.85-97
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    • 1989
  • 슈퍼나 소매점등에서 판매되는 상품의 포장을 자세히 살펴보면 흑색과 백색의 줄무늬가 인쇄되어 있는 것을 볼수가 있다. 이것을 bar code라고 하는 데 국명, 메이커명, 상품명등을 수치화하여 하나의 코드로 만들고 그것을 독해하여 가격을 산출하고 정산업무를 신속하고 정확하게 처리하면서 자료를 모아 해석하여 재고 관리, 발주, 매입 업무를 합리화하고 이를 정보 네트워크에 의하여 수요에 대응한 판매를 전개하는 등 물자의 유통관리에 폭넓게 이용되고 있다. 즉 bar code system은 흑색 또는 백색의 굵은 bar와 가는 bar의 구성에 의하여 하나의 성질 (숫자, 기호, 알파벳 문자)을 나타내고 그 연속을 광학식 입력수단을 통하여 하나의 코드에 정리한 자동화된 데이터수집(Automated Data Collection)방법으로 활용되고 있다. 본고에서는 이러한 bar code의 동작, 구성, 인식장치의 원리와 활용사례를 기술하였다.

삼차방정식의 기하적 해법에 대한 재조명과 시각화 (The reinterpretation and visualization for geometric methods of solving the cubic equation)

  • 김향숙;김양;박시은
    • East Asian mathematical journal
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    • 제34권4호
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    • pp.403-427
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    • 2018
  • The purpose of this paper is to reinterpret and visualize the medieval Arab's studies on the geometric methods of solving the cubic equation by utilizing Apollonius' symptom of the parabola. In particular, we investigate the results of $Kam{\bar{a}}l$ $al-D{\bar{i}}n$ ibn $Y{\bar{u}}nus$, Alhazen, Umar al-$Khayy{\bar{a}}m$ and $Al-T{\bar{u}}s{\bar{i}}$ by 4 steps(analysis, construction, proof and examination) which are called the complete solution in the constructions. This paper is available in the current middle school curriculum through dynamic geometry program(Geogebra).

데오드라이트 시스템의 측정 정확도에 대한 연구(II) -기준자 측정 높이에 따른 측정 정확도 (A Study on Measurement Accuracy of Theodolite System(II) -A Measurement Accuracy for a Height of Scale Bar)

  • 윤용식;이동주;정종길
    • 한국공작기계학회논문집
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    • 제13권4호
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    • pp.37-43
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    • 2004
  • A measurement accuracy of theodolite system may be affected by a measurement environment, a measurement distance change and so on. This study was performed for measuring an accuracy when the height of scale bar is changed 0.05m, 0.5m, 1m and 1.5m under the distance 3m between two theodolites, the distance 4m from the theodolite system to scale bar and the distance 5m from the thodolite system to the horizontal target bar. And we could know that the best height is 0.05m and 1m.

Pressure Effects on the Morphology Development of C/C Composites During Carbonization

  • Joo, Hyeok-Jong;Ryu, Seung-Hee;Ha, Hun-Seung
    • Carbon letters
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    • 제1권3_4호
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    • pp.158-164
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    • 2001
  • It is well known that the fabrication process of carbon/carbon composites is very complex. Above all, the carbonization process have major effect on the morphology development of carbon matrix. Carbon/carbon composites of 4-directional fiber preform were fabricated using the coal tar based pitch as a matrix precursor in this study. According to carbonization pressure of 1 bar, 100 bar, 600 bar, and 900 bar, morphological changes of cokes and matrix of composites were discussed. As the carbonization pressure increased to 600 bar, the flow pattern morphology of bulk mesophse was well developed. On the contrary, mosaic pattern morphology was found in case of 900 bar of carbonization pressure. It is confirmed that the carbonization pressure have profound effect on the degree of graphitization and crystal size of carbon matrix. Even in the highly densified carbon/carbon composites, large voids were still found in the matrix pocket region.

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An Experimental Study on the Evaluation of Shear Performance of PVA Fiber Reinforced RC Deep Beam with High Strength Headed Rebar

  • Kim, Seunghun;Lee, Kyuseon;Lee, Yongtaeg
    • Architectural research
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    • 제19권4호
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    • pp.109-115
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    • 2017
  • This study is done to evaluate how existence of shear-span ratio and shear reinforcing bar effects on shear performance from through shear experiment using PVA fiber reinforced ferroconcrete building. Ratio of shear-span was set 1, 1.7, and arrangement of shear reinforcing bar was set with KCI2012 regulation. In result, subject with less shear-span ratio, and shear reinforcing bar with arrangement of bar shows high stiffness. Subjects with high shear-span ratio show large difference depending on existence of shear reinforcing bar. Therefore, theoretical shear strength followed by CEB code underestimates experimental shear strength by 43.9%. Shear strength of the deep beam with headed bars is more affected by the bearing strength of head than the bond strength of bar.