Glaze Development with Application of Unity Molecular Formula

No, Hyunggoo,Kim, Soomin,Kim, Ungsoo,Cho, Wooseok The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.5

Effects of compositions and sintering conditions on glaze properties are shown in the diagram constructed by using the unity molecular formula (UMF) method in this study. Glossy characteristics of glaze were clearly differentiated by compositional area in the diagram and sintering process. As alumina and silica contents were increased, texture of the glaze became rough and opaque, akin to having been devitrified or underfired. The correlation between glossiness and surface roughness was found to be non-linear and inversely proportionate. Crystalline phases formed in the glaze were also influenced by the compositional area. Due to the high concentration of CaO, anorthite and wollastonite were formed depending on the compositions. Hardness was increased with an increase of alumina and silica concentrations in the glaze.

마이봄샘 기능부전을 동반한 안구건조증 환자에 대한 펄스광선 치료의 임상효과

김보윤(Boyun Kim),권형구(Hyunggoo Kwon),최아영(Ayoung Choi),김주혜(Juhye Kim),전소희(Sohee Jeon) 대한안과학회 2021 대한안과학회지 Vol.62 No.3

목적: 마이봄샘 기능부전을 포함한 안구건조증 환자를 대상으로 펄스광선 치료(intense pulsed light;IPL)를 시행한 후 안구건조증에 대한 임상적 분석을 통해 치료 효과를 알아보고자 하였다. 대상과 방법: 마이봄샘 기능부전으로 진단된 환자 62명 124안을 대상으로 후향적 연구를 시행하였다. 대상 환자는 3주 간격으로 3차례의 IPL을 치료받았으며;치료 전과 3주 간격의 시간에 따른 Meibomian gland expressibility (MGE);Meibomian gland secretion score (MGS);눈물띠검사(TMH);비침습적 눈물막파괴시간(noninvasive break-time;NIBUT);플루오레신 각막염색 점수(Oxford scale);환자의 증상(Ocular Surface Diseases Index [OSDI];주관적인 증상 개선 정도)를 비교하였다. 결과: IPL 치료 후 마이봄샘 기능관련 지표(MGE;MGS);안구 표면 관련 지표(NIBUT;Oxford scale);안구건조 증상(OSDI score;주관적인 증상 개선 정도)은 치료 전과 비교하여 IPL 1차 후;IPL 3차 후 통계적으로 유의하게 개선되었다(모두 p<0.05). 하지만 눈물띠검사는 IPL 치료 전후 비교에서 통계적으로 유의한 변화를 보이지 않았다. 결론: 마이봄샘 기능부전을 가진 안구건조증 환자에게 IPL 치료는 눈물막을 안정시키고;마이봄샘 기능 이상 및 주관적인 증상을 개선시키므로 안구건조증의 효과적인 치료가 될 수 있음을 확인하였다. Purpose: To evaluate the therapeutic effect of intense pulsed light (IPL) therapy for the treatment of dry eye with meibomian gland dysfunction (MGD). Methods: A retrospective study was conducted for 124 eyes of 62 patients with dry eye with MGD who underwent 3 IPL sessions at 3 week intervals. All patients underwent clinical examination before and during treatment as well as 3 weeks after the last treatment. Measured parameters include Meibomian gland expressibility (MGE);Meibomian gland secretion (MGS) score;tear meniscus height (TMH);noninvasive break-time (NIBUT);corneal staining score (Oxford scale);Ocular Surface Diseases Index (OSDI);and subjective ocular discomfort improvement. Results: Meibomian gland function (MGE;MGS);ocular surface parameters (NIBUT;Oxford scale) and dry eye symptom (OSDI;subjective ocular discomfort improvement) of patients were significantly improved from baseline to after the 1st IPL;and the 3rd IPL weeks (p < 0.05 for all). However;no significant difference in TMH was observed. Conclusions: This study showed that IPL was a useful and effective treatment in patients of dry eye with MGD to stabilizes the tear film and improve meibomian gland function and ocular symptoms.

강화학습에서의 감가율에 대한 다중화 접근법

김종헌(Jongheon Kim),김형구(HyungGoo Kim),김유성(Yusung Kim) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.12

디지털 세라믹 프린팅의 색채관리 평가 및 검증 연구 Ⅱ

노형구(No, HyungGoo),김응수(Kim, UngSoo),김진호(Kim, JinHo),김민형(Kim, MinHyoung),지용우(Jee, YongWoo) 한국색채학회 2016 한국색채학회 논문집 Vol.30 No.4

The digital ceramic printing technology uses ceramic materials tprint out the digital image and requires establishing the program for color management through the effective operation of the digital equipment, optimal ink property and interchangeability among materials. This study eliminates the ZnO or the case of reaction between the ink and glaze found in the previous study and replaces it with CaO-based frit to complement the problem. The color management of the digital ceramic printing consists of 4-channel inks including the blue, hot-pink, yellow and black for the ceramic process in the Create a New Mode phase. The output density in a single channel is optimized by the ink restriction, linearization and ink limit to confirm the excellent color phase and the stable color mix is reproduced under 200% of the ink output density. Besides, in this study, the ink volume of the hot-pink and yellow inks was increased to 100% with the color loss and weak color force under the low output density to confirm the output density of the ink mix and the profile of 2 conditions was established. The output image with the application of 2 profiles shows stable reproduction under the optimal output density and the color gamut expansion. The image with the maximum volume of the hot-pink and yellow shows difficulty in identifying fine tone change due to the strong contrast. Therefore, it is thought that the profile considering the color and tone of the output image should be applied to reduce the color losses. Therefore, the color control through the 4-channel (blue, hot-pink, yellow, black) inks shall expand the color gamut by setting up various profiles depending on the color and tone and applying the standard spot color like green, red, purple and orange.

산화티타늄이 청자유약의 발색에 끼치는 영향에 관한 연구

노형구,김응수,김종영,조우석,김철성,김진모,No, Hyunggoo,Kim, Ungsoo,Kim, Jongyoung,Cho, Wooseok,Kim, Chulsung,Kim, Chinmo 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.3

In aprevious study, the mutual interaction between $Fe_2O_3$ and $TiO_2$ was found to influence the color of celadon glaze. Celadon samples were prepared with varying concentrations of $TiO_2$ at a fixed level of $Fe_2O_3$. The electronic states of Fe and Ti were analyzed by M$\ddot{o}$ssbauer spectroscopy and electron spin-resonance spectroscopy, respectively. These results were examined with the celadon colors measured according to CIELAB values. This study revealed that an increase of $Ti^{3+}$ in the glassy phase decreased the $Fe^{2+}/Fe^{3+}$ ratio, resulting in a color change of the celadon samples in the GY and Y groups. The maximum reflectance wavelength was shifted from 505 nm to 610 nm with an increase in the $TiO_2$ concentration.

The Impact of SARS-CoV-2 Infection on Pulmonary Tuberculosis: A Nationwide Cohort Study

( Dong Won Park ),( Sang Hwan Lee ),( Yun Jin Kim ),( Jaehoon Oh ),( Hyunggoo Kang ),( Kyung Hun Yoo ),( Byuk Sung Ko ),( Tae Ho Lim ),( Bo-guen Kim ),( Hyun Lee ),( Sang-heon Kim ),( Jang Won Sohn ) 대한결핵 및 호흡기학회 2023 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.136 No.0

2016년 응급실 손상환자 심층조사 자료를 이용한 중독 환자의 분석

정성필 ( Sung Phil Chung ),이미진 ( Mi Jin Lee ),강형구 ( Hyunggoo Kang ),오범진 ( Bum Jin Oh ),김김현 ( Hyun Kim ),김양원 ( Yang Weon Kim ),전병조 ( Byeong Jo Chun ),김경환 ( Kyung Hwan Kim ) 대한임상독성학회 2017 대한임상독성학회지 Vol.15 No.2

Purpose: Some advanced countries have reported annual statistics for poisoning based on data from poison control centers. This study was conducted to propose a baseline format and statistics of poisoning in Korea from a national representative database. Methods: This study was a retrospective analysis of poisoning patients based on data from an emergency department (ED) based injury in-depth surveillance project by the Korea Centers for Disease Control and Prevention in 2016. Bite or sting injuries were not included. Variables related to poisoning were summarized using a similar format as the National Poison Data System in the United States. Results: A total of 7,820 poisoning patients presented to 23 EDs. Adults ≥20 years accounted for 84% of the population, while the proportion of intentional poisoning was 59.4%. The most common poisoning substances were therapeutic drugs (45%), gas (21%), pesticides (15%), and artificial toxic substances (13%). Overall, 34.5% of patients were admitted for further treatment. The mortality was 3.2% (248 cases), and the most common causative substances were carbon monoxide, glyphosate, and paraquat, in order. Conclusion: This study showed the recent status of poisoning in Korea. However, a comprehensive poisoning registry based on poison control centers may be required to provide more accurate national statistics in the future.

LTPS TFT를 사용한 화상처리용 SRAM 설계 방안

金炯玖,柳在熙 홍익대학교 과학기술연구소 2006 科學技術硏究論文集 Vol.17 No.-

Portable devices' display panel is getting smaller, lighter and more power-efficient by the large demands of users, image memory integration on display panel with poly Si is proposed. Despite low yield of poly Si process, poly Si is known as the most appropriate process for SRAM to make it better to implement the image memory integration. This paper presents how to model faulty SRAM cell with poly Si as well as SRAM circuits and their operations compared to CMOS. Also, the proposed fault tolerance study can play an important role in image processing system on panel implementation to be realized in the near future.

The impact of the COVID-19 pandemic on in-hospital mortality in the emergency department

Kim Changgyun,Lee Juncheol,Cho Yongil,Oh Jaehoon,Kang Hyunggoo,Lim Tae Ho,고벽성 대한응급의학회 2023 Clinical and Experimental Emergency Medicine Vol.10 No.1

Objective: The COVID-19 pandemic might have adversely affected outcomes of patients in emergency departments (EDs). The aim of this study is to evaluate the impact of the COVID-19 pandemic on in patients admitted through the emergency department. Methods: This study is a single-center, retrospective, observational cohort study. We compared the prognosis of patients admitted through the ED before the COVID-19 pandemic (November 2018 to June 2019) and after COVID-19 (November 2020 to June 2021). The primary outcome was in-hospital mortality. Multivariable logistic regression analysis was performed to determine whether the COVID-19 pandemic was independently associated with patient prognosis. Results: The number of patients admitted through the ED before and after COVID-19 was 5,333 and 4,625, respectively. The mean ED length of stay before and after COVID-19 was 401 and 442 minutes, respectively (P<0.001). The number of in-hospital deaths before and after COVID-19 were 269 (5.0%) and 322 (7.0%), respectively (P<0.001). Multivariable logistic regression analysis showed that the COVID-19 period was significantly associated with higher in-hospital mortality (adjusted odds ratio, 1.37; 95% confidence interval, 1.12–1.67; P=0.002). Conclusion: In the COVID-19 period, in-hospital mortality increased compared to that before COVID-19 among hospitalized ED patients.

디지털 세라믹 프린팅의 색채관리 평가 및 검증 연구

노형구(HyungGoo No),김응수(UngSoo Kim),조우석(WooSeok Cho) 한국색채학회 2015 한국색채학회 논문집 Vol.29 No.4

일반적인 디지털 프린팅(Digital Printing)은 Cyan, Magenta, Yellow, Black로 구성한 4 컬러 채널을 사용하는데, 디지털 세라믹 프린팅의 경우 고온 열처리 공정에서의 발색 안정성과 생산비용을 고려하여 Blue, Hot-Pink, Yellow, Black 잉크 4채널로 구축한 색채관리와 컬러 매칭 알고리즘(Color Matching Algorithm) 개발이 필요하다. 본 연구는 세라믹 소재와 제조공정에서 효율적인 운영을 위한 디지털 세라믹 프린팅의 색채관리 평가와 검증을 실시하였다. 디지털 세라믹 프린팅에 사용하는 액상 잉크를 분리·건조하여 분말상태로 분석한 결과 용액의 분산된 안료 농도에 따른 색오차를 나타냈다. 디지털 세라믹 프린팅의 색채관리를 위해 잉크 채널 구축(Creat a New Mode), 잉크 제한(Ink Restriction), 잉크 선형화(Linearization)의 과정을 거쳐 출력한 세라믹 팔레트의 반사율을 측정하고 잉크 포화도, 밀도, 볼륨 값을 연산하여 세라믹 프린팅의 최적의 출력 조건을 제시하였다. 단일채널 출력 팔레트는 매우 안정적으로 컬러와 명도 단계를 나타냈다. 최적의 잉크 출력량을 통해 디지털 이미지를 출력하여 컬러의 재현성을 평가하였다. 그러나 출력이미지는 컬러, 채도, 명도의 단계를 확인하기 어려웠으며, 2채널과 3채널 혼합색 잉크의 출력량이 매우 낮은 것으로 판단되었다. 디지털 세라믹 프린팅을 위해 Blue, Hot-Pink, Yellow, Black의 4채널로 사용은 Cyan 과 Magenta의 컬러 재현이 불가능 하였고, Blue 잉크와 Hot-Pink잉크로 인한 2채널 혼합색인 Green, Red, Purple, Orange 컬러에서 매우 낮은 채도와 탁한 톤으로 나타나는 문제점이 발생하였다. 따라서 단일 채널, 2채널, 3채널의 잉크 출력량을 제어할 수 있는 디바이스 구축을 통한 세라믹 프린팅에 적용하는 표준 색공간(Standard Color Space)이 확립되어야 할 것이다. While regular digital printing uses four color channels of Cyan, Magenta, Yellow, and Black, but in consideration of the stability of coloring and the cost of production in the process of high temperature treatment, digital ceramic printing required development of a color matching algorithm and a color management system, which consists of four color channels of Blue, Hot-Pink, Yellow and Black. In this study, assessment and verification of color management of digital ceramic printing was conduct for efficient management of ceramic material and manufacturing process. Liquid inks used for digital ceramic printing were separated and made into dry powder for analysis. The results of the analysis found color differences according to concentration of ink dispersion. In addition, this study suggests the condition for optimal output of ceramic printing by measuring reflectance of a ceramic palette printed through process of Create a New Mode, Ink Restriction and Linearisation, as well as calculation of ink saturation, ink density, and ink volume. A single-channel printing palette showed significantly stable color and lightness level. Color reproducibility was assessed by printing digital images with optimal amount of ink ejection. But it was difficult to verify level of hue, chroma and lightness of the printed images, and it was verified that the amount of ink ejection of 2-channel and 3-channel was significantly low. Some troubles were also found in the analysis. For instance, the use of the aforesaid 4 channels – Blue, Hot-Pink, Yellow and Black – for digital ceramic printing could not reproduce cyan and magenta, and significantly low chroma and dull tone were produced in Green, Red, Purple and Orange, 2-channel mixture of Blue and Hot-Pink. Accordingly it is required to establish a standard color space applied to ceramic printing via constructing a device which can control the amount of ink ejection of single-channel, 2-channel and 3-channel.