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이병하,Tran Thi Mai,송종태,김정회 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4
The Arabidopsis thaliana NGATHA (NGA) familyis a four-membered subclade of the B3-type transcriptionfactor superfamily, and plays an essential role in the styledevelopment. NGAs also act as negative regulators of cellproliferation in leaf and petal growth. The notion that NGAsmight act as promoters of a general differentiation programhas been proposed to explain the involvement of NGAs inthese seemingly discrete functions. Here, we tested this notionby activating NGA1 transcription in the expression domainsof Arabidopsis thaliana Meristem Layer 1, AINTEGUMENTA,SHOOTMERISTEMLESS, CLAVATA3 (CLV3), and WUSCHEL(WUS), where cells remain mostly undifferentiated andpluripotent. We found that those specific cells expressingNGA1 lost their meristematic competence, becoming terminallydifferentiated. We also found that the inflorescence meristems ofthe plants expressing NGA1 in the CLV3 domain failed todevelop floral meristems and differentiated into a terminalcarpeloid cylinder without any other floral organs; similarly,the floral meristems of the plants expressing NGA1 in theWUS domain all developed into carpeloid cylinders with noother floral organs. Our results not only support the notionthat NGA1 seems to be a promoter of a general differentiationprogram, but also raise the possibility that NGA1 may act asa carpel identity factor.
Specialty Fiber Coupler: Fabrications and Applications
이병하,엄주범,Kwan Seob Park,Seong Jun Park,Myeong Jin Ju 한국광학회 2010 Current Optics and Photonics Vol.14 No.4
We review the research on specialty fiber couplers with emphasis placed on the characteristics that make them attractive for biomedical imaging, optical communications, and sensing applications. The fabrication of fiber couplers has been carried out with, in addition to conventional single mode fiber, various specialty fibers such as photonic crystal fiber, double clad fiber, and hole-assisted fiber with a Ge-doped core. For the fiber coupler fabrication, the side polishing and the fused biconical tapered methods have been developed. These specialty fiber couplers have been applied to optical coherence tomography, fluorescence spectroscopy, fiber sensors, and optical communication systems. This review aims to provide a detailed statement on the recent progress and novel applications of specialty fiber couplers.
Korean–Chinese Migrant Workers and the Politics of Korean Nationalism
이병하,최준영,서정민 인하대학교 국제관계연구소 2014 Pacific Focus Vol.29 No.3
Why has Korean migration policy been ethnicized? This research mainlyaims to explain ethnic preference in Korea’s immigration policy through thelens of Korean nationalism. The influx of ethnic Koreans in China (orJoseonjok) since the early 1990s has created a new dilemma for the SouthKorean government, which has long claimed to be the only legitimate polityof the Korean nation. The discrepancy between the legal citizenship andethnicity of the Korean–Chinese workers in Korean society has forced theKorean state to redefine both legal and discursive national boundaries. Thisstudy analyzes the bifurcation of the Korean state discourses regardingKorean–Chinese workers in Korean society.
이병하 한국학술연구원 2009 Korea Observer Vol.40 No.4
This article attempts to trace and critically review the development of immigration policies in Korea since the early 1990s. International migration as a global and universal phenomenon has challenged nation states, and theories of immigration policy seek to identify and explain factors affecting the choices made by states in this regard. However, two dominant theories, the political-economy and neo-institutionalist approaches, both of which emphasize economic interests and liberal principles, respectively, fail to provide a satisfactory explanation of the complex process of immigration policymaking when it comes to other factors including security and ethno-cultural diversity. Therefore, this article adopts the theory of the functional imperatives of the state, as suggested by Christina Boswell, focusing on security, accumulation, fairness, and institutional legitimacy in order to examine the complexity of immigration policymaking. Adopting Boswell’s theoretical framework, this article explores what functions of the state-embedded immigration policies have been emphasized by each administration since the early 1990s. This article also seeks to examine whether there have been changes in the immigration policy under the current Lee Myung-bak administration and, if so, in what areas the current government’s policy is distinguished from the policies of the two previous administrations.
이병하,서만수,류형호,박세정,양정덕,조병채,문정환,정호윤,이동걸,박재우,김인산,김상우,배은희,이동신 대한성형외과학회 2004 Archives of Plastic Surgery Vol.31 No.3
This study is to compare the effect of wound healing using three different types of chitin, which include the shapes of sponge, velvet, thick non-woven fabrics, and thin non-woven fabrics. The sponge type had more capacity to absorb the first discharge of a wound than the velvet type and the two non-woven fabrics types. Instead of absorbing the discharge effectively, the velvet type showed a difficulty to take off the dressing stuff from a wound since it was solidly stuck to the wound. The sponge type showed less infiltration of inflammatory cells, producing angiogenesis and fibroblast faster than any other types. Next, the thick non-woven fabrics type was a little more effective than the thin non-woven fabrics type: However, there was no difference between two types. The velvet type sustained the infiltration of inflammatory cells for the longest duration, producing slower angiogenesis and fibroblast. In wound contraction and wound healing, the sponge type was most effective with statistical significance than any other types(p<0.05). The two types of non-woven fabrics did not present any statistical significance in wound contraction, wound epithelization and wound healing(p>0.05).In conclusion, the sponge type showed the best effectiveness to absorb the early discharge, facilitating the progress of inflammatory phase to increase the healing rate. It induced an early healing of wound caused by wound contraction rather than by wound epithelization.