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박현익(Hyun-Ik Park),박연준(Yeon-Jun Park),유광호(Kwang-Ho You),노봉건(Bong-Kun Noh),서영호(Young-Ho Seo),박찬(Chan Park) 한국암반공학회 2009 터널과지하공간 Vol.19 No.4
대부분의 결정질 암석은 압축강도에 비해 인장강도가 현저하게 낮으므로 근본적으로는 인장에 의한 취성파괴의 형태를 나타낸다. 암반이 충분한 강도와 지지력을 가진다 하더라도 현지 암반응력이 크거나 암반 구조물 형상에 따른 유도응력의 작용방향에 의해 암반의 강도를 초과하는 응력집중이 발생될 경우 취성파괴가 발생할 수 있다. 따라서 심부 암반 구조물의 안정성평가를 위해서는 암반의 취성파괴 거동특성 규명이 반드시 필요하다. 암반이 충분한 강도와 지지력을 가진다 하더라도 현지 암반응력이 크거나 암반 구조물 형상에 따른 유도응력의 작용방향에 의해 암반의 강도를 초과하는 응력집중이 발생될 경우 취성파괴가 발생할 수 있다. 따라서 심부 암반 구조물의 안정성평가를 위해서는 암반의 취성파괴 거동특성 규명이 반드시 필요하다. 본 논문에서는 과지압을 받는 심부터널 주변 암반의 취성파괴 특성을 파악하기 위하여 국내 대표 암종인 흑운모 화강암과 화강암질 편마암의 대심도 암석시료에 대한 손상제어시험을 수행하고, 이로부터 점착력과 마찰각의 변화특성을 파악하였다. 또한 그 결과를 이용하여 CWFS 모델을 구성하고, 이 모델을 지하심부에 굴착되는 터널에 적용하여 터널주변 암반에 발생하는 취성파괴 양상 및 파괴가능 심도를 M-C 모델 결과와 비교 및 분석하였다. Most crystalline rocks have much higher compressive strength than tensile strength and show brittle failure. In-situ rock mass, strong enough in general sense, often fails in brittle manner when subjected to high stress exceeding strength in due of geometrically induced stress concentration or of high initial stress. Therefore, it is necessary to verify the brittle failure characteristics of rock and rock mass for proper stability assessment of underground structures excavated in great depths. In this study, damage controlled tests were conducted on biotite-granite and granitic gneiss, which are the two major crystalline rock types in Korea, to obtain the strain dependency characteristics of the cohesion and friction angle. A Cohesion-Weakening Friction-Strengthening (CWFS hereafter) model for each rock type was constructed and a series of compression tests were carried out numerically while varying confining pressures. The same tests were also conducted assuming the rock is Mohr-Coulomb material and results were compared.
환경요인에 따른 거머리말(Zostera marina)과 게바다말(Phyllospadix japonicus)의 발아율
박정임 ( Jung Im Park ),이근섭 ( Kun Seop Lee ),손민호 ( Min Ho Son ) 한국환경생물학회 2012 환경생물 : 환경생물학회지 Vol.30 No.3
We investigated germination rate of Zostera marina and Phyllospadix japonicus, which are the most two abundant seagrass species of Korea, in related to light, salinity and temperature. Light had no significant effect on Z. marina germination, but it promoted P. japonicus germination. The highest germination of Z. marina appeared in 0 psu, and that of P. japonicus appeared in 15 psu. The optimum water temperatures for germination of Z. marina and P. japonicus were 5℃ and 15℃, respectively. These differences of optimum germination requirements of Z. marina and P. japonicus were probably caused by the difference of the habitat environment of the two seagrass species. Since few data exist concerning germination of Korean seagrasses, this study provides valuable information for the conservation of seagrass habitats in Korea.
다회 인슐린 투여가 당뇨병 환자의 삶의 질, 우울 및 불안 요소에 미치는 영향
박예리 ( Ye Ree Park ),김태석 ( Tae Suk Kim ),박용규 ( Yong Gyu Park ),이성수 ( Seong Su Lee ),김성래 ( Sung Rae Kim ),손현식 ( Hyun Shik Son ),윤건호 ( Kun Ho Yoon ),강무일 ( Moo Il Kang ),차봉연 ( Bong Youn Cha ),이광우 ( Kwang 대한내과학회 2009 대한내과학회지 Vol.77 No.1
Background/Aims: Treatment using multiple daily insulin(MDI) should give diabetic patients many benefits. Nevertheless, few studies have examined the impact of an increased frequency of daily insulin injection on quality of life, anxiety levels, and depression in diabetic patients, and individual`s continued compliance with MDI is unclear. This study examined these issues using standardized questionnaires. Methods: This was a cross-sectional, randomized study. Ninety-nine insulin-treated type 2 diabetic patients (mean age 53.1±12 years, mean duration of diabetes 10.3±6.5 years) were divided a group (n=50) who injected insulin four times daily (mean age 49.6±12.3 years, mean duration of diabetes 6.5±6.4 years) and a group (n=49) who injected insulin once or twice daily (mean age 56.4±11.6 years, mean duration of diabetes 11.5±5.8 years). All patients independently completed the Korean Version of the World Health Organization Quality of Life Scale Abbreviated Version and standardized Hospital Anxiety and Depression Scale for Koreans. Results: No significant differences were evident with respect to age, gender, and duration of diabetes between the two groups (p<0.05). No significant differences were evident in the results of the questionnaires between the two groups, except for the physical health domain (p<0.05). Conclusions: Multiple daily insulin injections had nearly no influence on quality of life, anxiety levels, or depression in type 2 diabetic patients. Therefore, treatment with MDI should be considered for patients who would benefit from this. (Korean J Med 77:60-67, 2009)
철근배근형태에 따른 철근보강 숏크리트의 휨파괴 거동특성 연구
박연준(Yeon-Jun Park),이정기(Jung-Ki Lee),노봉건(Bong-Kun Noh),유광호(Kwang-Ho You),이상돈(Sang-Don Lee) 한국암반공학회 2010 터널과지하공간 Vol.20 No.3
H-beam과 격자지보는 국내 터널공사에서 가장 널리 쓰이는 강지보재이다. 스칸디나비아를 비롯한 북유럽 국가들에서 흔히 쓰이는 철근보강 숏크리트는 H-beam 이나 격자지보 이상으로 경제적이고 효율적인 측면에서 이점이 있음에도 국내에서는 아직 적용되지 않고 있다. 본 연구에서는 실험실 시험을 통하여 국내 터널에 가장 적합한 철근 배근 설계를 결정하고자 복철근 배근을 포함하여 철근 배근 형태를 달리하여 시험을 수행하고 그 결과를 비교하였다. H-beam과 격자지보에 의한 보강효과도 같은 방법으로 분석하였다. 본 연구의 결과는 NMT나 NATM 터널에서 지보재의 선택 및 설계에 활용될 수 있을 것으로 판단된다. H-beam and lattice-girder are the two most commonly used steel supports in domestic tunnels. Reinforced Ribs of Shotcrete(R.R.S.), which is frequently used in Scandinavian countries, is yet to be employed in Korea despite its advantages over H-beam or lattice girder in terms of economy and constructional efficiency. In this study, laboratory tests were conducted to determine the most suitable design of R.R.S in domestic tunnels. Various configuration of steel reinforcements including double layer of steel rebars were tested and compared. Reinforcement with H-beam and lattice girder were also analyzed. Results of this study can be of great use in selecting and designing of tunnel supports when the tunnel is excavated by NATM or Norwegian Method of Tunnelling(NMT).
이식된 포기거머리말(Zostera caespitosa)의 형태적 특성 및 생산성의 변화
박정임 ( Jung Im Park ),박재영 ( Jae Yeong Park ),이근섭 ( Kun Seop Lee ),손민호 ( Min Ho Son ) 한국환경생물학회 2012 환경생물 : 환경생물학회지 Vol.30 No.1
Abstract - To evaluate adaptation success of Zostera caespitosa transplants, we transplanted the seagrass shoots at the bare area in close proximity to the donor bed using staple method in October 2005. Shoot density, morphological characteristics and leaf productivity of transplants and reference plants in the vicinity of the planting site were monitored monthly for 2 years. While shoot density of reference plants exhibited significant seasonal variations; increasing during spring and summer and decreasing during fall and winter, that of transplants increased consistently without initial loss during the whole study period. Although sheath length, leaf width and shoot height and weight of sheath, leaf and shoot of transplants were smaller than those of reference plants at the start of transplantation, increased rapidly reaching even higher values than those of reference plants 5 months after transplantation. Leaf productivity of transplants and reference plants showed seasonal variations; increasing during spring and summer and decreasing during fall and winter. But, leaf productivity of transplants increased at the beginning of transplantation during fall which is low production period. All of the Z. caespitosa transplants survived during the whole study period. Rapid changes in shoot morphology and growth of transplants indicated that Z. caespitosa transplants had great morphological plasticity and adapted successfully within 5 months.
저장 방법과 기간에 따른 거머리말 (Zostera marina)의 발아율
박정임,박재희,이근섭,손민호,Park, Jung-Im,Park, Jay Hee,Lee, Kun-Seop,Son, Min Ho 한국해양학회 2014 바다 Vol.19 No.2
거머리말 종자의 적절한 저장 방법과 저장 가능한 기간을 알아보기 위하여 우리나라 남해안에서 채취한 거머리말 종자를 이용하여 다양한 저장 방법과 저장 기간 후 발아율을 조사하였다. 거머리말 종자의 저장 방법은 공기가 공급되는 실온의 해수, $4^{\circ}C$의 해수, $30^{\circ}C$의 해수, 해수가 공급되는 수조, 밀폐된 해수, 냉동, 건조의 방법으로 저장하였다. $4^{\circ}C$의 해수에 저장한 거머리말 종자의 발아율이 가장 높았으며(52.0%), 해수가 유입되는 수조와 실온에서 저장한 종자의 발아율은 각각 17.7%와 27.4%가 나타난 반면, 건조, 냉동한 종자와 $30^{\circ}C$의 해수에 보관한 종자는 전혀 발아하지 않았다. 거머리말 종자의 각 저장 기간은 10, 20, 30, 60, 180일과 240일 동안 저장하였다. 10~60일 동안 저장한 거머리말 종자는 46.4~52.4%의 발아율을 유지하였으나, 저장 기간이 길어질수록 급격히 발아율이 감소하여, 240일 저장한 거머리말은 전혀 발아되지 않았다. To determine the optimal storage method and longest possible storage period of Zostera marina seeds, we examined post-storage germination rates using different storage methods and periods for Z. marina seeds harvested in southern coast of Korea. Storage methods included in seawater at room temperature with air supply, seawater at $4^{\circ}C$, seawater at $30^{\circ}C$, an aquarium with continuous seawater circulation, seawater at room temperature in an airtight tank, a refrigerator at $-20^{\circ}C$, and a desiccator at room temperature. Germination rates of Z. marina seeds stored in seawater at $4^{\circ}C$ showed highest germination (52.0%), whereas those of seeds stored in seawater at room temperature and an aquarium were 27.4% and 17.7%, respectively. But the seeds stored in seawater at $30^{\circ}C$, a refrigerator, and a desiccator did not germinate. Storage periods were 10, 20, 30, 60, 180 and 240 days of storage. Z. marina seeds maintained germination rates of 46.4~52.4% until 10~60 days of storage, but showed rapidly decreasing germination rates after then and no germination after 240 days.