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최현규,김혜민,최순열,김경근,최순호,Choi Hyun-Kue,Kim Hae-min,Choe Soon-Youl,Kim Kyung-Kun,Choi Soon-Ho 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.1
Generally. in the molecular dynamics simulations. the Verlet neighboring list algorithm is used for the reduction of a simulation time On the other hand. the application of the Verlet neighboring list forces the time evolution of a simulation system to follow an unrealistic path in a phase space. In equilibrium state, it does not matter with the simulation results because the individual molecule's motion is originally random and any effect due to a small deviation from a real time evolution can be completely ignored. However, if an unsteady state is involved. such a deviation may significantly affect to the results. That is, there is a Possibility that the simulation results Provide ones with any misleading data In this study we evaluated the effect due to the Verlet neighboring list in performing the simulation of a non-equilibrium state and suggested the method to avoid it.
최현규(Hyun Kue Choi),문수범(Soo Bum Moon),최순열(Soon Youl Choe),최순호(Soon-Ho Choi),김경근(Kyung Kun Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
An ejector driven by a liquid is a fluid transfer equipment to be used under a poor suction condition, which means that there exists a possibility to occur a cavitation. It is a highly reliable device because it has no movable part in it, that is only a passive equipment. The ejector is an inevitably necessary one to overcome a poor pumping condition and to mix uniformly two fluids, however it has a low efficiency since it requires a pump for its operation. This study is for the development of a new-type liquid ejector with the application of a nozzle shape alteration, which maximize the suction performance of it. which provides the increased competition with the domestic industries. Also, the increased performance opens a new manufacturing method to use a commercial pipes for the production of an ejector, which is based on a trivial loss of a performance. However, this minor loss can be sufficiently compensated by the increased performance of a new-type ejector. Therefore, the developed ejector by this study can considerably reduce the manufacturing time and cost while its performance is largely increased.
최현규(Hyun-Gue Choi),김정기(Jong-Ghee Kim),조의식(Eui-Sic Cho) 대한해부학회 1999 Anatomy & Cell Biology Vol.32 No.5
턱밑샘은 신경성장인자와 상피성장인자의 주요 근원으로 알려져 있다. 본 연구에서는 턱밑샘을 외과적으로 제거한 후 이들 성장인자들이 결합하여 작용하는 것으로 알려진 신경성장인자 수용체와 상피성장인자 수용체가 하악치아를 포함하는 하악골에서 어떻게 변화하는 지를 알아봄으로써 하악치아에서 이들 성장인자의 생리적인 기능을 알아보고자 하였다. 대조군에서 상피성장인자 수용체에 대한 면역반응은 관찰할 수 없었으나 신경성장인자 수용체에 대한 면역반응은 치주인대와 절치의 법랑모세포에서 제한적으로 관찰되었다. 턱밑샘절제군에서 상피성장인자수용체와 신경성장인자 수용체에 대한 면역반응은 하악제1대구치의 상아모세포와 치주인대세포, 절치의 법랑모세포, 골수강의 일부 세포에서 관찰되었고 이들은 턱밑샘절제술 후 시간이 지남에 따라 반응성이 증가하였으며 반응세포에 있어서도 다양화되는 경향을 보였다. 이상의 결과로 보아 하악대구치와 절치에 분포하는 신경성장인자 수용체와 상피성장인자 수용체의 분포특성은 턱밑샘절제후에 분포특성이 변화함을 알 수 있었다. 따라서 턱밑샘기원의 상피성장인자와 신경성장인자는 직,간접적인 경로를 통해 치아의 유지와 하악골의 개조 등의 과정에서 생리적인 기능을 수행할 것으로 사료된다. Immunohistochemical changes of epidermal growth factor receptor (EGFR) and nerve growth factor receptor (NGFR) were investigated in the rat mandibular molar and incisors after submandibular sialadenectomy. In the sham operated rat, any EGFR immunoreactivity was not observed in the teeth but NGFR immunoreactivities were observed exclusively in the periodontal ligament and ameloblasts of incisor. In the sialadenectomized rat, EGFR immunoreactivities were observed in the odontoblasts of the mandibular first molar, periodontal ligament cells, ameloblasts of incisor and some cells of bone marrow. NGFR immunoreactivities were more intense and widely distributed in alveolar bone, periodontal ligaments and odontoblasts of the sialadenectomized rat than in the sham operated rat. Both of EGFR and NGFR immunoreactivities gradually increased in their intensities in a time-dependent manner after submandibular sialadenectomy. The results show that expression of EGFR and NGFR in the mandibular molar and incisor is enhanced by submandibular sialadenectomy. Therefore, it is suggested that EGF and NGF derived from submandibular gland may affect to the mandibular molar and incisors by direct and/or indirect mechanism.