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한덕기,김휘동,한상현 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
We developed a Off-Line Graphic Simulator which can simulate a robot model in 3D graphics space in Windows 98 version. 4 axes industrial robot was adopted as an objective model. Forward kinematics, inverse kinematics and robot dynamics modeling were included in the developed program. The interface between users and the off-line program system in the Windows 98's graphic user interface environment was also studied. The developing language is Microsoft Visual C++. Graphic libraries, OpenGL, by Silicon Graphics, Inc. were utilized for 3D graphics.
Alloxan에 依한 角膜血管 新生 侵入과 β線 照射量과의 關係에 關한 實驗的 硏究
韓德基,尹正佑 경북대학교 의학연구소 1969 慶北醫大誌 Vol.10 No.2
It is the purpose of this paper to decide the effective simallest doses and intervals of the fractional irradiation of beta-ray generated from the ^90Sr., using adult rabbits as a means of experimental animals. It has been found by previous research that ^90Sr. beta irradiation is the most effective therapeutic measure to curtail the corneal neovascularization process which is the usual accompaniment of the keratitis. For the best resulr, fracitonal irradiation of the beta-ray to the corneal lesion is found to be the choice of irradiation treatment. To the best of the author's knowledge, there has been no report of fractional irradiation for the corneal neovascularization in literature. Thirty adult rabbits were divided into 5 groups. In the animals, the left side corneas were used for the experiment and the right side for control. To the anterior chamber of the eye, 04.ml. of 2.0% alloxan solution was injected to provoke a neovassularizaiton of the cornea. Beta-ray irradiation was given to the corneas of the rabbits when the neovascularization progressed to the extent of 1.0-3.0mm. A single dose each of the following amount of irradiation were given: 600, 1,200, 1,800, 2,400 and 3,000 rads to the lesion of the left corneas of group Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ, respectively. Following results were obtained: 1. In group 1, the 600-rad-irradiation group, the corneal neovascularization was inhibited until the 4th post-irradiation day. After this period, the inhibitory effect of the irradiation in the study group appeared to subside, and thereafter, the same progression rate in both control and study groups were noted. The mean progression rate of alloxan-induced neovascularization in the rabbit cornea during the period up to the 4th post-irradiaiton day was 0.34mm. per day, whereas the control rate was 0.48mm. per day. It appears that an additional repeated or fractional irradiation may be given effectively on the 5th post-irradiation day. 2. In group Ⅱ, the 1,200 rad irradiation group, a satisfactory inhibitory effect of corneal neovacularization was discernible up until the 8th post-irradiation day. The mean progression rate of the corneal vascular intrusion during the above period was 0.21 mm. per day for the irradiated animals while the control was maintained at 0.45 mm. per day. 3. In group Ⅲ, the 1,800 rad irradiation group, the mean extent of the daily vasular progression was 0.21mm, per day until the 10th post-irradiation day, while the control was maintained at 0.45mm. per day. 4. In group Ⅳ, the 2,400 rad irradiation group, and group Ⅴ, the 3,000 rad irradiation grnup, the corneal neovascularization was considerably curtailed respectively. The mean vascular progression rates were 0.19 and 0.13 mm. per day, for the group Ⅳ and Ⅴ. 5. In those group which received larger doses of beta-ray riadiation, the healing rate of the alloxan-induced corneal lesion tended to be slower than in the control group. 6. It appears that the inhibitory effect of the beta-ray irradiation on the corneal neovascularization takes place on the second post-irradiation day. In conclusion, this author has found that the initial optimal doses of beta-ray irradiation and the proper intervals between the initial and second fractional irradiation is 1,200 rads and 8 day.
오프라인 프로그래밍을 이용한 스카라 로봇의 통합제어 시스템 설계
한덕기,김휘동,조홍식,한성현 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
We developed a Off-Line Graphic Simulator which can simulate a robot model in 3D graphics space in Windows 95 version. 4 axes SCARA robot was adopted as an objective model. Forward kinematics, inverse kinematics and robot dynamics modeling were included in the developed program. The interface between users and the off-line program system in the Windows 95's graphic user interface environment was also studied. The developing language is Microsoft Visual C++. Graphic libraries, OpenGL, by Silicon Graphics, Inc. were utilized for 3D graphics.
한덕기 한국환경농학회 2023 한국환경농학회지 Vol.42 No.3
. The emergence and spread of antibiotic-resistant bacteria have been increasing with anthropogenic contamination. Understanding the prevalence and distribution of these resistant bacteria in environments is crucial for effectively managing anthropogenic pollutants. Lake Gyeongpo in the Gangwon Province of South Korea is known for its diverse ecological features and human interactions. The lake is exposed to pollutants from nonpoint sources, including urban areas, agricultural practices, and recreational activities, which can introduce antibiotics and foster antibiotic resistance in bacteria. The present study investigates Lake Gyeongpo as a potential reservoir for antibiotic-resistant bacteria in a natural ecosystem. A total of 203 bacterial isolates were collected from six sampling locations in Lake Gyeongpo during May, July, and November 2022. Most isolates were taxonomically identified as Pseudoalteromonas, Bacillus, Shewanella, and Vibrio spp.; their abundance showed a spatiotemporal distribution. An antibiotic susceptibility test was conducted on 75 isolates using the disk diffusion method with six drugs according to the CLSI guideline; 42 isolates were resistant to one or more antibiotics. Among these, 15 isolates were identified as multidrug resistant bacteria. This finding suggests the potential anthropogenic impact on Lake Gyeongpo and provides valuable insights into the dissemination of antibiotic resistance caused by anthropogenic pollutants