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崔宗洛,洪仁植 경북대학교 과학교육연구소 1981 科學敎育硏究誌 Vol.5 No.-
The energy crises in Korea has been a serious problem in the economic development In this paper, the present status of the crisis is discussed, and then the contents and the methods of the energy education is also discussed. The contents of education, eighteen items in the cognitive domain, seven items in the affective domain, and eight items of the skills are selected. The learing and teaching method of the education, inquiry method is recommended so that the students are able to acquire the best knowledges and skills of energy control through their real experience.
홍종락(Jong-Rak Hong),강나라(Nara Kang),정필훈(Pill-Hoon Choung) 대한구강악안면외과학회 2004 대한구강악안면외과학회지 Vol.30 No.1
The purpose of this study was to evaluate the stability and efficacy of biologic membrane made of freeze-dried cartilage as a barrier to facilitate guided bone regeneration in experimental non-healing bone defects in the rat mandible. Nine adult Sprague-Dawley rats(400-500g) were used in experiment. 5.0mm in diameter were created on the mandibular angle area by means of slow-speed trephine drill. In microscopic examination, dynamic immature bone forming at 2 weeks and its calcification at 4 weeks were observed. The membrane made of lyophilized cartilage taken from human costal cartilage seems to be very effective for guided bone regeneration as a biologic membrane and the scaffold for attachment of cells or local drug delivery system of growth factor, which may meet the ideal requirement of a barrier membrane and graft materials
홍종락(Jong-Rak Hong),강나라(Nara Kang),정필훈(Pill-Hoon Choung) 대한구강악안면외과학회 2004 대한구강악안면외과학회지 Vol.30 No.2
The purpose of this study was to evaluate the resistant force of medial pterygoid muscles against the mandibular advancement and distraction to anterior, and inquire into the relationship between medial pterygoid muscles and cephalometric variables. Sixty six patients with class III malocclusion underwent bilateral sagittal splitting of ramus with intraoralvertico-sagittal ramus osteotomy for mandibular set-back. The spring scale was used to measure the resistance of medial pterygoid muscles after splitting of ramus. Skeletaldental cephalometric analysis was made and statistic package was used for correlation between resistance and cephalometric variables. The resistant force of the right medial pterygoid muscle was greater than the left one in Koreans with class III malocclusion, and the force had a linear regression relationship with facial depth. The results suggested that facial depth has significant correlation with the resistance of medial pterygoid muscle, which can be acquired from patient’s cephalometric analysis.
Numerical simulation for light extraction in nano-patterned light-emitting diodes.
Hong, Jun-Hee,Park, Si-Hyun,Park, Jong Rak,Kim, Jin-Tae,Park, Jinseong,Kwon, Kwang-Woo American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.10
<P>We present numerical simulation results using the three-dimensional finite-difference time-domain method for light extraction in light-emitting diodes (LEDs) constructed on nano-patterned n-GaN substrates. We studied reasonable conditions for numerical calculation, including excitation source conditions, simulation size conditions, and boundary conditions and examined the effects of the size and distribution of nano-patterns on light extraction. Our findings revealed optimized structures for high extraction efficiency. Our simulation results were consistent with our experimental results and show the potential for the design of LED structures optimized for high light extraction.</P>
Effects of LED Light and Temperature on Lettuce Growth
Hong, Pyo-Hwan,Kwon, Oh-Hoon,Lee, Dong-In,Park, Jong-Rak,Ha, Jeong Min,Jeong, Da Un,Han, Seong Ho,Kim, Bonghwan Korean Society of Food and Agricultural Informatio 2011 Agribusiness and Information Management Vol.3 No.1
This study examines the effects of lightemitting diode (LED) light and temperature on lettuce growth. For plant growth, we used an LED bar composed of red, white and blue LEDs (4:1:2). Six types of cultivation equipment were used to measure the temperature. To compare their effects, the heights of the lettuces and the water temperatures were measured. The results demonstrated that the lettuce growth was optimal at $25^{\circ}C$.