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이형주,소진수,김홍근,Lee-Ku Kwac,안원찬 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.1
The use of an Al$_x$Ga$_{1-x}$As bound Ga$_z$In$_{1-z}$P strain compensation structure for optimum strain in latticed mismatched In$_{0.07}$GaAs/GaAsP$_{0.06}$ multiple quantum wells (MQWs) and its effect on the output power of an infrared light-emitting diode at 940-nm were investigated. A Ga$_{0.53}$InP tensile strain structure, which effectively compensate excessive compressive strain in the In$_{0.07}$GaAs/GaAsP$_{0.06}$ MQWs, was inserted between a quantum well and a quantum barrier. The Al$_{0.2}$GaAs material was used as both a growth buffer and a balancing barrier for In$_{0.07}$GaAs/Al$_x$Ga$_{1-x}$As-bound Ga$_{0.53}$InP/GaAsP$_{0.06}$ MQWs. From photoluminescence (PL) measurements and X-ray diffraction (XRD) rocking curves, we verified that the Ga$_{0.53}$InP tensile strain barrier could effectively compensate the compressive strain of the In$_{0.07}$GaAs/GaAsP$_{0.06}$ MQWs. In addition, a further increase in the PL intensity from the In$_{0.07}$GaAs/Al$_y$Ga$_{1-y}$As-bound Ga$_{0.53}$InP/GaAsP$_{0.06}$ MQWs was found after having adjusted the Al$_{0.2}$GaAs strain tuning barrier. This result was significantly supported by the stable balance of the energy bandgap structure in the developed MQWs. From fabricated IR-LEDs chips, the LED with an In$_{0.07}$GaAs/GaAsP$_{0.06}$ MQW employing the Al$_{0.2}$GaAs-bound Ga$_{0.53}$InP strain compensation structure displayed a 48\% higher light output power as compared with a conventional LED. These results suggest that the use of an Al$_{0.2}$GaAs-bound Ga$_{0.53}$InP strain compensation structure effectively improved both the unbalanced strain and the unbalanced energy bandgap of lattice-mismatched In$_{0.07}$GaAs/GaAsP$_{0.06}$ MQWs for 940-nm IR-LEDs.
Helicobacter pylori 감염에 의한 Cytokines 유전자 발현에 대한 치양탕(治瘍湯)의 효과
이형주,원진희,문구,문석재,박동원,Lee, Hyung-Ju,Won, Jin-Hee,Moon, Goo,Moon, Seok-Jae,Park, Dong-Won 대한한방내과학회 1999 大韓韓方內科學會誌 Vol.20 No.1
Effects of Chiyangtang(CYT) on H. pylori-induced increase of interleukin 8 and interleukin 1 gene expression was studied in Kato Ⅲ cell line, a human stomach epithelial cell line. Treatment of H. pylori to the cell culture signifant!y increased IL-8 and IL-1 mRNA synthesis. When CYT was added along with H. pylori, the increase of IL-8 and IL-1 mRNA synthesis was blocked. Activation of transcription factor $NF-{\kappa}B$ and AP-1 which were known to important in IL-8 and IL-1 gene expression was also studied using chloramphenicol acetyltransferase(CAT) assay. Treatment of H. pylori increased activation of $NF-{\kappa}B$ and AP-l and CYT effectively protected the activation. Electrophoretic mobility shift assay suggested that CYT effectively inhibited DNA binding of $NF-{\kappa}B$ and AP-l to their cognate site. These results suggested that CYT could prevent stomach diseases through the down regulation of IL -8 and IL-l gene expression which might be mediated by the inhibition of $NF-{\kappa}B$ and AP-1 activities and their binding to DNA.
이형주,김대환,김진평,박정제,Lee, Hyeong Joo,Kim, Dae Hwan,Kim, Jin Pyeong,Park, Jung Je 대한후두음성언어의학회 2018 대한후두음성언어의학회지 Vol.29 No.1
Tuberculosis of the retropharynx is extremely rare. The diagnosis is frequently delayed because of its anatomical location and atypical symptom. It would be crucial to consider tuberculosis infection as a possible source of abscess and should be mindful about the tests to diagnose it. We experienced a 23-year-old man with retropharyngeal abscess caused by tuberculosis presenting hypernasality and hoarseness in the throat. In this article, we reviewed the etiology, diagnosis, and treatment of this case, with a review of literatures.
Ellipsometry를 이용한 193 nm photoresist에서의 물의 흡수 연구
이형주,이정환,서주빈,경재선,안일신,Lee, Hyoung-Joo,Lee, Jung-Hwan,Seo, Ju-Bin,Kyoung, Jai-Sun,An, Il-Sin 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.2
We employed in-situ spectroscopic ellipsometry(SE) and imaging ellipsometry(IE) to study the interaction of water and photoresist(PR) in 193 immersion lithography. Real time measurement of SE showed thickness increase when PR was immerged in water indicating swelling effect. From the temporal evolution we could observe its reaction-limited behavior. Meanwhile, IE could identify the modification of PR surface by contact of water even for a short period of a second.
이형주,Seung-Ki Kim,Heon-Seok Lee,김우석 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.5
As part of the research on cement composites using cellulose nanocrystal (CNC) aqueous solution instead of general water, this study produced high-toughness cement composites reinforced with flax and steel fibers to improve the tensile deformation capacity, assessing the isothermal conduction calorimetry analysis, drying shrinkage, and strength characteristics. The mixing amount of CNCs was 0.4, 0.8, and 1.2 vol.% by volume of cement, and an aqueous solution was prepared using the ultrasonication dispersion method. When comparing the results of the experiment according to the CNC mixing ratio, CNCs at 0.8 vol.% led to an improvement in the shrinkage rate and mechanical performance compared with the plain specimen.
이형주,임성락,Lee, Hyeong-Ju,Im, Seong-Rak 한국정보처리학회 1995 정보처리논문지 Vol.2 No.6
기존의 유닉스 시스템에서는 모든 장치의 구동기가 커널 내부에 구현되어 있다. 따라서, 새로운 장치를 지원하기 위한 구동기를 추가하거나 기존의 구동기를 변경할 경우 커널 내부의 수정 작업이 불가피하다. 일반적으로 유닉스 시스템에서는 커널내 부의 수정 작업이 매우 어렵다. 본 논문에서는 이러한 어려움을 극복하기 위한 방법 으로써 사용자 수준의 단말기 구동기 모델을 제시한다. 제시한 모델의 기본 개념은 단말기 구동기를 사용자 수준의 서버로 구현함으로써 새로운 단말기 구동기의 동적 재구성을 제공하는 것이다. 제시한 모델의 타당성을 검증하기 위해 사용자 수준의 단말기 구동기를 SunOS 와 Linux 환경에서 구현하고, 그 성능을 평가하였다. In the conventional UNIX system, the all device driver realized in the kern el. Hence, whenever we want to add a new device driver or change the existin g device driver, the modification of kernel is unavoidable. Generally, it is very difficult to modify the kernel codes.As a method of overcoming this difficulty, a TTY device driver model of user-level is presented in this paper. The basic concept of this model is providing a dynamic reconfiguration of TTY device driver by realizing a user-level server process for TTY device driver. In order to verify the proper y of this model, a prototype of TTY device driver has been realized in the SunOS and Linux environment and evaluated its performance.