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- 저자 : Jhun, Hyunjhung (검색결과 609 건)
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Novel Technique for Splay to Bend Transition in a ${\pi}$ Cell
Jhun, Chul-Gyu,Lee, Jong-Lac,Kang, Sang-Ho,Lee, Seong-Ryong,Kim, Jae-Chang,Yoon, Tae-Hoon The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.2
A ${\pi}$ cell is initially in splay state. Before driving a ${\pi}$ cell, transition from splay to bend state is always necessary which originates from nucleation. We propose a novel technique to make bend transition fast and effectively by forming transition cores around the pixels with the technique of multi-domain alignment, where domain boundaries play a crucial role in splay to bend transition. This noble technique enables the splay to bend transition to occur within less than 2 seconds with a low applied voltage.
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On a Modified k-spatial Medians Clustering
Jhun, Myoungshic,Jin, Seohoon The Korean Statistical Society 2000 Journal of the Korean Statistical Society Vol.29 No.2
This paper is concerned with a modification of the k-spatial medians clustering. To find a suitable number of clusters, the number k of clusters is incorporated into the k-spatial medians clustering criterion through a weight function. Proposed method for the choice of the weight function offers a reasonable number of clusters. Some theoretical properties of the method are investigated along with some examples.
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Vitamin D Status in South Korean Military Personnel with Acute Eosinophilic Pneumonia: A Pilot Study
Jhun, Byung Woo,Kim, Se Jin,Kim, Kang,Lee, Ji Eun,Hong, Duck Jin The Korean Academy of Tuberculosis and Respiratory 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Background: A relationship between low vitamin D levels and the development or outcomes of respiratory diseases has been identified. However, there is no data on the vitamin D status in patients with acute eosinophilic pneumonia (AEP). We evaluated the vitamin D status in patients with AEP among South Korean military personnel. Methods: We prospectively compared the serum levels of total 25-hydroxyvitamin D [25(OH)D], 25(OH)D3, and 25(OH)D2 among patients with AEP, pulmonary tuberculosis (PTB), and community-acquired pneumonia (CAP). Results: In total, 65 patients with respiratory diseases, including AEP (n=24), PTB (n=19), and CAP (n=22), were identified. Of the 24 patients with AEP, 2 (8%) had deficient total 25(OH)D levels (<10 ng/mL), 17 (71%) had insufficient total 25(OH)D levels (${\geq}10$ to <30 ng/mL), and only 5 (21%) had sufficient total 25(OH)D levels (${\geq}30$ to <100 ng/mL). The difference in the total 25(OH)D levels among patients with AEP, PTB, and CAP was not statistically significant (p=0.230). The median levels of total 25(OH)D, 25(OH)D3, and 25(OH)D2 were 22.84, 22.84, and 0.00 ng/mL, respectively, and no differences in the 25(OH)D level were present among patients with AEP, PTB, and CAP with the exception of the total 25(OH)D level between patients with AEP and PTB (p=0.042). Conclusion: We have shown that low vitamin D levels are frequently found in patients with AEP and are comparable with those in patients with PTB and CAP.
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A Study on the Tradition of Tea Ceremony and Cultural Industry in Japan
Jhun Jae Hyun 조선대학교 국제문화연구원 2013 국제문화연구 Vol.6 No.2
his year, as countries short in natural resources, both South Korean and Japanese government and industries have acknowledged that both needs to invest in improving their presence in cultural enterprises to utilize their national powers more efficiently and have been in talks to find a practical method to do so. It should be noted that Dado (다도, 茶道, tea ceremony) is a very important asset as a business and as acentral theme for multiple cultural enterprises. The purpose of this studyisto identify the current state of Japanese Dado (다도, 茶道, tea ceremony) and to utilize that information to develop contents which will boost South Koreas Dado (다도,茶道, tea ceremony). After being organized by Sen no Riky.(千利休 1522~1591) in the 14th century a tea ceremony Meister program was established around JapansE-ye-moto(家元) and became one of the most unique cultural system to represent Japans tea ceremony. Originally tea was brought over to Japan by monks who traveled abroad to Tang Dynasty (618~907) to study Buddhism. They would bring over the tea seeds and plant them in Seburi mountain located in Saga-hyun. Teas popularity hit near rock bottom until in 1911 where Eisai (1141-1215), who built the Shofujuki temple, brought back tea from the Song Dynasty. During the Muromachi period Dado (다도,茶道, tea ceremony) began to establish its basic form by embracing the flashy styles of Higashiyama culture. As a reaction to the overly extravagant ways, Murata Juk. (1432-1510) preferred a more simple and modest approach and established the Wabi tea style based on his philosophy that tea and meditation is one(다선일미, 茶禪一味). His style was passed down to Takeno J..(武野紹., 1502-1555) who in turn passed the torch to Sen no Riky. during the Azuchi-Momoyama period. Sen no Riky. perfected the art of tea ceremony and completed the Wabi tea culture started by Burata Shuko. Wabi tea is considered the original tea ceremony form for Japans tea culture and Sen no Riky. was the one who defined it. Sen no Riky. not only establish and refine the Wabi tea style but also the s.an tea (lit., "grass hermitage") which emphasized on freedom and practicality. Sen no Riky.s pupil Yamanoue Shoji (1544-1590) added his philosophy ofIchigo-Ichieh (一期一會lit., Once in a lifetime) to that of Shikishichisoku of Sen no Riky. and continued to improve upon it. Tea began to reach the general public only after modern era. There are three groups who make up the Sansenke, which is in the very heart of Japanese tea culture, and they are Omote Senke (1613~1672), Ura Senke, Mushano Kouji Senke. Some also consider Yabunouchi Ryu and Sadohayami Ryu and call them the big five. Japan has not only embraced Tea ceremony as part of their cultural heritage but also has turned it into a great medium and utilized it in various business and content creations to raise its marketability. First of all, various venues such as Tanabe museum, Irimashi museum, Tea information center and culture centers hold tea ceremonies and classes where everyone can join in for anominal fee. Second, places such as Numas Koyotei Memorial Park, Uahhonjin park, Porenakakawane Tea center, Shijuokas Tea center, Shimistei Park serves tea to the general public and also hold entertainment events with Tea infused into their programs. Third, various mediums such as Ang Donuts, Nihonjinno shiranai Nihongo (Japanese even Japanese don't know), Hanayori Dango, Aoki Sachikos Chabashirakuri comic in weekly publication Times, and Japanese webtoon the Tears of Tea-Larmes de The by Minamo Kaeroo published in EDEN provides multiple angles for tea to reach the general public and last, sales of tea drinks, instant teas, and tea related character products for adding values to teas. As seen above the reasonwhyDado (다도, 茶道, tea ceremony) has become so accessible to the public was due to the abundant amount of information provided via media and public services and the sales of various tea and tea related products. Enjoying tea is no longer a luxury but apart of every days life as ahobby or for fashion. South Korea should learn and absorb the strong points of Japanese practices and begin spreading the Dado (다도, 茶道, tea ceremony) spirit by naturally augmenting Dado (다도, 茶道, tea ceremony) into everyday activities.
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Electronic structure of charged bilayer and trilayer phosphorene
Jhun, Bukyoung,Park, Cheol-Hwan American Physical Society 2017 Physical Review B Vol.96 No.8
<P>We have investigated the electronic structure of charged bilayer and trilayer phoshporene using first-principles density functional theory calculations. We find that the effective dielectric constant for an external electric field applied perpendicular to phosphorene layers increases with the charge density and is twice as large as in an undoped system if the electron density is around 5 x 10(13) cm(-2). It is known that if few-layer phosphorene is placed under such an electric field, the electron band gap decreases, and if the strength of the electric field is further increased, the band gap closes. We show that the electronic screening due to added charge carriers reduces the amount of this reduction in the band gap and increases the critical strength of the electric field for gap closure. If the electron density is around 4 x 10(13) cm(-2), for example, this critical field for trilayer phosphorene is 40% higher than that for a charge-neutral system. The results are directly relevant to experiments on few-layer phosphorene with top and bottom electrical gates and/or with chemical dopants.</P>
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An Analysis of the Geometrical and Optical Characteristics of Prisms Used in Elementary Schools
Jhun Youngseok 한국물리학회 2023 새물리 Vol.73 No.1
In this report, I describe investigations of the dispersive prisms used in elementary-school science classes to determine the extent to which they are uniform and accurate. As samples, I selected eight prisms that are widely used in schools, and I measured their refractive indices as functions of the wavelength of the light as well as their physical properties, such as shape and density. I measured the refractive index at each wavelength using a red He–Ne laser and yellow, green, and blue laser pointers. To ensure the precision of the measurements, I employed a threaded needle fixed to a stand as an indicator to determine the exact path of the light. In addition, rather than measuring the vertex, incident, and deviation angles directly, I obtained them by measuring the side lengths of a triangle drawn along the light path and then calculating the angles using the cosine law. As a result of this investigation, I found that prisms typically used in schools are neither right nor regular and that a variety of widely used materials—especially plastics—have varying densities and refractive index distributions. I also confirmed that some prisms had narrow dispersion, making it difficult to produce a clear spectrum.
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