Correction: Rewritable full-color computer-generated holograms based on color-selective diffractive optical components including phase-change materials

Hwang, Chi-Young,Kim, Gi Heon,Yang, Jong-Heon,Hwang, Chi-Sun,Cho, Seong M.,Lee, Won-Jae,Pi, Jae-Eun,Choi, Ji Hun,Choi, Kyunghee,Kim, Hee-Ok,Lee, Seung-Yeol,Kim, Yong-Hae The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.47

<P>Correction for ‘Rewritable full-color computer-generated holograms based on color-selective diffractive optical components including phase-change materials’ by Chi-Young Hwang <I>et al.</I>, <I>Nanoscale</I>, 2018, DOI: 10.1039/c8nr04471f.</P>

황구침법(黃丘鍼法)을 이용한 고혈압 환자의 혈압강하 효과에 대한 증례보고

한창현 ( Chang Hyun Han ),황치원 ( Chi Won Hwang ),신미숙 ( Min Suk Shin ),신선화 ( Seon Hwa Shin ),최선미 ( Sun Mi Choi ) 대한경락경혈학회 2006 Korean Journal of Acupuncture Vol.23 No.3

Objectives: The aim of the study was to investigate the antihypertensive effect of Hwang-gu Acupuncture in hypertensive patients. Methods: We measured the blood pressure of the patients who were admitted in the Oriental Medical Clinic of Brother from 25th November 2005 to 27th March 2006. We included the patients only in case of the systolic blood pressure was over 140mmHg or diastolic blood pressure was over 90mmHg, Twenty two patients were treated by Hwang-gu Acupuncture. In order to evaluate the effect of the Hwang-gu Acupuncture, the blood pressure was measured before and after Acupuncture procedure total 4 times, 10times. Results: There were a significant decrease in the systolic blood pressure and significant decrease in the diastolic blood pressure by Hwang-gu Acupuncture 4 times. The effect of Hwang-gu Acupuncture by measurement time on blood pressure were follows: In a systolic blood pressure was gradually deceased significantly from 1st to 4th but diastolic blood pressure was significantly decreased after 2nd and 4th only. Conclusions: These results suggest that Hwang-gu Acupuncture is effective in decreasing the systolic and diastolic blood pressure.

콘크리트 크리프와 건조수축의 CEB-FIP Model Code와 ACI Code의 비교

전쌍순,박태균,황택균,엄장섭,진치섭 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-

크리프 현상으로 인하여 구조물의 변형이나 처침은 시간의 경과와 더불어 중대하게 되고, 라멘, 아치 등과 같은 부정정 구조물에서는 건조수축으로 인한 부재의 변형 때문에 큰 수축응력이 일어난다. 따라서, 일시적으로 작용하는 하중에 비하여 지속하중이 큰 구조물에 있어서는 크리프의 영향을 설계해야 하고, 콘크리트 구조설계에서 건조수축은 매우 중요하다. 우리나라 콘크리트 설계기준을 비롯하여 세계각국의 코드에 크리프와 건조수축에 대해서 규정하고 있다. 그러나, 크리프와 건조수축에 관한 규정이 매우 복잡한 식으로 제시되어 있어 수 계산으로는 크리프 및 건조수축병형률을 계산하기가 어렵다. 본 연구에서는 Windows 환경에서 쉽게 CEB-FIP Model Code 및 ACI Code에 의한 크리프와 건조수축 변형률을 계산할 수 있는 프로그램을 작성하여 글 결과를 서로 비교 고찰하였다. Concrete under stress undergoes a gradual increase of strain with time because of creep deformations of the concrete. The final creep strain may be several times as large as the initial elastic strain. Generally creep has little effect on the strength of a structure, but it will cause a redistribution of stress in reinforced concrete members at the service loads. When concrete loses moisture by evaporation, it shrinks. Shrinkage strains are independent of the stress conditions in the concrete. If restrained, shrinkage strains can cause cracking of concrete and will generally cause the deflection of structural members to increase with time. In 2000, the Korea Concrete Institute Code took up CEB-FIP Model Code instead of ACI Code on creep and shrinkage of concrete, but their calculation procedures are tedious and difficult. In this study, programs are provided and it will be useful for the practicing engineers.

요관결석 환자에서 강성요관경하 제석술과 요관절석술에 대한 임상적 고찰

김홍섭,황선태,노용수,양상국,박치영 건국대학교 의과학연구소 1995 건국의과학학술지 Vol.5 No.-

Patients with ureteral calculi may be managed by expectant, invasive, or noninvasive treatments, depending on the stone composition, size and location, expectations of the patients, and experience of the surgeon. Currently ureteroscopic removal of stone(URS) has been popularly used for the treatment of ureteral calculi. From January 1992 to December 1994,we retrospectively compared the clinical results of 87 URS's to those of 31 ureterolithotomies and analysed the factors that affect the result of URS. The clinical results of two groups were summarized as follows The mean stone size was 7.6㎜ in URS group and 12.1㎜ in ureterolithotomy group. In 81.6% of URS group, the stone was located in the lower ureter and 71% of ureterolithotomy group in the upper ureter. The mean operation time, hospital stay and costs of the URS group, 96.6% of the stone were removed or disintegrated. There was no statistical significance in the success rate of URS along the sex difference, the location and size of stone. However, the higher the location of stone was, the more operation time spent. The complication rate of URS was estimated 26.5% but most of complications were resolved by conservative management. We conclusively suggest that the URS is the acceptable alternative modality of the ureterolithotomy for the treatment of the ureteral calculi.

메타카오린의 포조란 효과에 의한 콘크리트 내 알칼리-실리카 반응 억제 효과

이효민,전쌍순,황진연,진치섭,윤지해,옥수석 한국광물학회 2004 광물과 암석 (J.Miner.Soc.Korea) Vol.17 No.3

알카리-실리카반응은 시멘트 내의 알칼리와 화학적으로 불안정한 반응성 골재와의 화학반응으로서, 그 결과 콘크리트의 팽창과 균열을 발생하는 작용이다. 본 연구에서는 우수한 포조란반응 특성을 나타내는 새로운 광물혼화재로 부각되고 있는 메타카오린의 알칼리-실리카반응 억제 효과에 대하여 연구하였다. 다양한 치환율로 메타카오린을 혼합한 모르타르 공시체를 제작하여, 알칼리-실리카 반응성 시험(ASTM C 1260), 압축강도 시험 및 유동성 시험을 실시하고, 시멘트 수화물에서의 구성성분 변화에 대한 XRD 정량분석을 실시하였다. 그 결과, 메타카오린의 혼합은 시멘트 페이스트내의 가용 포트랜다이트의 함량을 급속히 감소시키는 빠른 포조란반응 및 수화반응 특성을 나타내어, 알칼리-실리카 반응에 의한 팽창을 억제하고 우수한 압축강도를 발현하는 것으로 나타났다. 시멘트에 메타카오린의 혼합에 의한 알칼리-실리카 반응에 의한 팽창억제는 치환율 15% 이상, 즉 시멘트 페이스 내의 가용 포트랜다이트 함량이 약 10% 이하가 될 경우 효과적이다. 메타카오린의 혼합에 의한 알칼리-실리카 반응에 의한 팽창 억제는 유해성이 높은 알칼리-칼슘-실리카 겔의 형성이 억제된 결과와 포조란 효과에 의한 치밀하고 균질한 시멘트 페이스트 형성으로 인한 알칼리 용액의 침투가 억제된 결과에 의한 것으로 생각된다. 15% 이상의 메타카오린의 혼합은 보통의 모르타르보다 높은 초기강도를 발현하였으며, 후기강도는 전 치환율 범위에서 보통의 모르타르 이상의 아주 우수한 강도를 나타내었다. 강도발현 특징은 메타카오린에 의한 빠른 포조란반응 및 수화특성을 반영하고 있다. Alkali-silica reaction (ASR) is a chemical reaction between alkalies in cement and chemically unstable aggregates and causes expansion and cracking of concrete. In the present study, we studied the effects of metakaolin, which is a newly introduced mineral admixture showing excellent pozzolainc reaction property, on the inhibition of ASR. We prepared mortar-bars of various replacement ratios of metakaolin and conducted alkali-silica reactivity test (ASTM C 1260), compressive strength test and flow test. We also carefully anal zed the mineralogical changes in hydrate cement paste by XRD qualitative analysis. The admixing of metakaolin caused quick pozzolanic reaction and hydration reaction that resulted in a rapid decrease in portlandite content of hydrated cement paste. The expansion by ASR was reduced effectively as metakaolin replaced cement greater than 15%. This resulted in that the amounts of available portlandite decreased to less than 10% in cement paste. It is considered that the inhibition of ASR expansion by admixing of metakaolin was resulted by the combined processes that the formation of deleterious alkali-calcium-silicate gel was inhibited and the penetration of alkali solution into concrete was retarded due to the formation of denser, more homogeneous cement paste caused by pozzolanic effect. Higher early strength (7 days) than normal concrete was developed when the replacement ratios of metakaolin were greater than 15%. And also, late strength (28 days) was far higher than normal concrete for the all the replacement ratios of metakaolin. The development patterns of mechanical strength for metakaolin admixed concretes reflect the rapid pozzolanic reaction and hydration properties of metakaolin.

음낭내에 발생한 해면 혈관종 1례

노영수,박치형,황선태,김홍섭 건국대학교 의과학연구소 1994 건국의과학학술지 Vol.4 No.-

Intrascrotal hemangioma is very rare, benign vascular tumor characterized by soft and spongy like compressible vascularity. It is primarily composed of large venous channel occuring in the deep dermis and subcutaneous tissue, first reported by Robert in 1851. Complications of intrascrotal hemangioma include thrombosis, phlebitis, massive hemorrhage, and infertility. The treatment of choice is wide local excision of the tumor with the overlying skin. We have experienced a case of intrascrotal cavernous hemangioma who was a 24-year old man with painful scrotal mass and reported with literatures.

Vertical Channel ZnO Thin-Film Transistors Using an Atomic Layer Deposition Method

Chi-Sun Hwang,Sang-Hee Ko Park,Himchan Oh,Min-Ki Ryu,Kyoung-Ik Cho,Sung-Min Yoon IEEE 2014 IEEE electron device letters Vol.35 No.3

<P>Vertical channel ZnO thin-film transistors (TFTs) were fabricated on glass and flexible substrates. Conformally deposited thin films prepared using atomic layer deposition were used for the active layer, gate insulator, and gate electrode. Owing to the very short channel (0.5 μm) and very thin (20 nm) gate insulator layer, the ON-current of the vertical channel ZnO TFT was 57 μA at the gate and drain voltages of 3 and 4 V, respectively. Vertical channel oxide TFTs may be promising for device applications with low power consumption.</P>

Development of Core Material Technology for Ultra-High Resolution/Highly Flexible Display Backplane

Chi-Sun Hwang(황치선) 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.2

디지털 홀로그램 구현을 위한 공간광변조기 기술

황치선(Chi-Sun Hwang),김용해(Yong-Hae Kim),최지훈(Ji Hun Choi),피재은(Jae-Eun Pi),양종헌(Jong-Heon Yang),김기현(Gi Heon Kim),조성목(Seong-M. Cho),전상훈(Sang-Hoon Cheon),최경희(Kyunghee Choi),김주연(Joo Yeon Kim),이원재(Won-Jae Lee) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8

Caffeic acid phenethyl ester protects against photothrombotic cortical ischemic injury in mice

Hwang, Sun Ae,Kim, Chi Dae,Lee, Won Suk The Korean Society of Pharmacology 2018 The Korean Journal of Physiology & Pharmacology Vol.22 No.1

In this study, we aimed to investigate the neuroprotective effects of caffeic acid phenethyl ester (CAPE), an active component of propolis purified from honeybee hives, on photothrombotic cortical ischemic injury in mice. Permanent focal ischemia was achieved in the medial frontal and somatosensory cortices of anesthetized male C57BL/6 mice by irradiation of the skull with cold light laser in combination with systemic administration of rose bengal. The animals were treated with CAPE (0.5-5 mg/kg, i.p.) twice 1 and 6 h after ischemic insult. CAPE significantly reduced the infarct size as well as the expression of tumor necrosis $factor-{\alpha}$, hypoxiainducible $factor-1{\alpha}$ monocyte chemoattractant protein-1, $interleukin-1{\alpha}$, and indoleamine 2,3-dioxygenase in the cerebral cortex ipsilateral to the photothrombosis. Moreover, it induced an increase in heme oxygenase-1 immunoreactivity and interleukin-10 expression. These results suggest that CAPE exerts a remarkable neuroprotective effect on ischemic brain injury via its anti-inflammatory properties, thereby providing a benefit to the therapy of cerebral infarction.