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전해 도금을 이용한 높은 접착 특성을 갖는 섬유 기반 웨어러블 디바이스 제작
김형구,노호균,차안나,이민정,박준범,정탁,하준석,Kim, Hyung Gu,Rho, Ho Kyun,Cha, Anna,Lee, Min Jung,Park, Jun-beom,Jeong, Tak,Ha, Jun-Seok 한국마이크로전자및패키징학회 2021 마이크로전자 및 패키징학회지 Vol.28 No.1
In order to produce wearable displays with high adhesion while maintaining flexible characteristics, the adhesive method using electro plating method was carried out. Laser lift-off (LLO) transcription was also used to remove sapphire substrates from LEDs bonded to fibers. Afterwards, the SEM and EDS data of the sample, which conducted the adhesion method using electro plating, confirmed that copper actually grows through the lattice of the fiber fabric to secure the light source and fiber. The adhesion characteristics of copper were checked using Universal testing machine (UTM). After plating adhesion, the characteristics of the LLO transcription process completed and the LED without the transcription process were compared using probe station. The electroluminescence (EL) according to the enhanced current was measured to check the characteristics of the light source after the process. As the current increases, the temperature rises and the bandgap decreases, so it was confirmed that the spectrum shifted. In addition, the change in the electrical characteristics of the samples according to the radius change is confirmed using probe station. The radius strain also had mechanical strength that copper could withstand bending stress, so the Vf variation was measured below 6%. Based on these results, it is expected that it will be applied to batteries, catalysts, and solar cells that require flexibility as well as wearable displays, contributing to the development of wearable devices. 유연한 특성을 유지하면서 높은 접착력을 가진 웨어러블 디스플레이를 제작하기 위하여 전해도금법을 이용한 접착법을 진행하였다. 또한 섬유에 접착된 LED의 사파이어 기판을 제거하기 위하여 LLO 전사법을 이용하였다. 그 후 전해도금을 이용한 접착법을 진행한 샘플의 SEM, EDS 데이터를 통하여 실제로 구리가 섬유직물의 격자사이를 관통하여 성장하며 광원과 섬유를 고정시켜주는 것을 확인하였다. 구리의 접착특성을 확인하기 위하여 Universal testing machine (UTM)을 이용하여 측정하였다. 도금 접착 후 laser lift-off (LLO) 전사공정을 완료한 샘플과 전사공정을 진행하지 않은 LED의 특성을 probe station을 이용하여 비교하였다. 공정 이후의 광원의 특성을 확인하기 위하여 인가 전류에 따른 electroluminescence (EL)을 측정하였다. 전류가 증가할수록 온도가 상승하여 Bandgap이 감소하기 때문에 spectrum이 천이하는 것을 확인하였다. 또한 radius 변화에 따른 샘플의 전기적 특성 변화를 probe station을 이용하여 확인하였다. Radius 변형에도 구리가 bending stress를 견딜 수 있는 기계적 강도를 가지고 있어 Vf 변화는 6% 이하로 측정되었다. 이러한 결과를 토대로 웨어러블 디스플레이 뿐만 아니라 유연성이 필요한 배터리, 촉매, 태양전지 등에 적용되어 웨어러블 디바이스의 발전에 기여할 수 있을 것으로 기대한다.
김형구 ( Hyung Gu Kim ),송윤경 ( Yun Kyung Song ),정철 ( Chul Jung ),김학주 ( Hak Ju Kim ),최일환 ( Il Hwan Choi ),김호준 ( Ho Jun Kim ) 대한면역약침학회 2012 대한면역약침학회지 Vol.1 No.1
Objectives: A pharmacokinetic study to evaluate wild ginseng pharmacopuncture solution was performed to rats. Urine and blood samples were collected and analyzed in HPLC. Methods: Rats were injected 1ml of solution of wild ginseng pharmacopuncture(SGP) intraperitoneally and blood samples were collected from tail vein and urine samples were acquired in individual metabolic cages. The ingredients of wild ginseng, bear gallbladder, musk, and ox bezoar were analyzed separately as well as mixed solution for standard. Results: 1. Most ingredients of SGP solution standard were shown in the retention time 12-30 miutes. 2. Serum samples did not show significant peaks in the same retention time with standard SGP solution. 3. Urine samples showed peaks with same retention time with standard SGP from 12 hour especially eminent after 48 hours. 4. These results may be interpreted as SGP was not accumulated in the serum but excreted as urine.
김형구 ( Hyung Gu Kim ),이명종 ( Myeong Joo Lee ),김호준 ( Ho Jun Kim ),김기철 ( Ki Cheol Kim ),( Shambhunath Bose ) 한방비만학회 2012 한방비만학회지 Vol.12 No.1
This study was designed to investigate the effects of fermented soybean upon anti-inflammation, cytotoxicity, antioxidant and intestinal mucous membrane permeability by measuring the cell viability, NO (nitric oxide) production, DPPH, Polyphenol, HRP and TEER in cells like Raw 264.7 and HCT 116 using fermented soybean. Methods Raw 264.7 cell and HCT 166 cell were used in this study. And fermented soybean powders were used for the experimental group and soybean powders for the control group. There was inflammation response upon using lipopolysaccharide(LPS). Fermented soybean powders and soybean powders were in a respectively different dose added to the cells with LPS. MTT assay, NO, DPPH and Polyphenol measurement, TEER, HRP were conducted for each cell. The results of this study were presented in mean and standard deviation. Results 1. In Raw 254.7 cells added with 100μl/ml unfermented soybean powders, 104.95% higher than 62.59% was measured. In Raw 254.7 cells added with 100μl/ml fermented soybean powders, there was 74.90% measured higher than 62.59%, which was a significant result. 2. By a gradual increase of unfermented soybean powders like 0.1μl/ml, 1.0μl/ml, 10μl/ml, 100μl/ml, the measured NO were also gradually decreased 53.12μM, 47.57μM, 37.02μM, 28.16μM. In case of cells added with fermented soybean powders, 43.95μM NO was measured in 0.1μl/ml which is significant, and in other cases, mostly measured over 56.72μM. 3. It was inferred that fermented soybean powders have anti-inflammatory effects of maintaining intestinal mucous membrane permeability because the measured values of cells in both groups were all higher than 133.62Ω measured of cells added with only LPS. And measured values of cells in both groups were all lower than 2.26 measured of cells added with only LPS. 4. In case of experiment DPPH and polyphenol measurement, fermented group was all higher than unfermented group. Conclusion From the results of conducting MTT assay, NO measurement, and TEER, HRP by using cells Raw 264.7 and HCT-116, even though there was no significance in the correlation between cytotoxicity, anti-inflammatory effects, both unfermented soybean powders and fermented soybean powders were shown to have intestinal mucous membrane permeability improvement effects. This effects could be applicable for autoimmune diseases, chronic inflammatory diseases and so additional studies are expected in the future. From the results of conducting DPPH, Polyphenol measurement, Fermented soybean may be useful as potential antioxidant.
연잎-연근 복합 발효물이 흰쥐의 내당능 및 지질대사 관련 유전자 발현에 미치는 영향
김형구 ( Hyung Gu Kim ),( Shambhunath Bose ),김동일 ( Dong Il Kim ),구병수 ( Byung Soo Koo ),김호준 ( Ho Jun Kim ) 한방재활의학과학회 2014 한방재활의학과학회지 Vol.24 No.1
ObjectivesThis study was performed to evaluate the effects of fermented lotus extracts on prediabetes and hyperlipidemia in high fructose diet rats. MethodsExtracts of lotus leaf and lotus root were fermented using 4 different probiotics separately, including Lactobacillus plantarum, Lactobacillus rhamnosus, Bifidobacterium breve, and Bifidobacterium longum. Expressions of adipogenic transcription factors includ-ing Adiponectin, GLUT-4, Leptin, PPAR gamma, Resistin and Visfatin were analyzed by Real time PCR and Western blotting analysis. ResultsFermented lotus extracts reduced blood glucose. Fermented lotus extracts in-hibited adipogenic transcription factors by inhibiting preadipocytes differentiation. The level of gene expression of Adiponectin, GLUT-4, Leptin, PPAR gamma, Resistin and Visfatin in relation to that of GAPDH were increase or decrease significantly with the Fermented lotus formulation group. ConclusionsFermented lotus extracts showed hypoglycemic and hypolipidemic effects by inhibiting preadipocyte differentiation and controlling insulin sensitivity in high fructose di-et rats. (J Korean Med Rehab 2014;24(1):1-12
김형구(Hyoung-Gu Kim),손재영(Jae-Young Son),선우영수(Young-Soo Sun Woo) 한국컴퓨터정보학회 2009 한국컴퓨터정보학회 학술발표논문집 Vol.16 No.2
21세기 초 경쟁 환경에서 조직이 대처하기 위한 기업환경의 패러다임도 바뀌어 가면서 지식자산은 보다 더 중요한 기업가치 창출의 요소로 자리 잡게 되었다. 그러나 아직까지 대다수의 기업은 지식경영을 수행함에 있어 조직문화나 정보기술과 같은 지식경영 영향요소(knowledge management enabler)자체에만 초점을 맞추고 있을 뿐 이를 어떻게 전략적으로 활용할 것인가에 대한 명확한 체계를 갖고 있지 못한 것도 사실이다. 따라서 종사원들이 보유하고 있는 지식이 기업의 근본자산이 되는 호텔 기업경영에 있어 변화하는 환경에 능동적으로 대처하며, 또한 시장에서의 경쟁우위의 획득 및 유지를 위해서는 전략적 지식경영 하에서 기업의 지식경영활동이 이루어져야 한다. 이러한 관점에서 호텔기업의 지식경영전략이 경영성과에 미치는 영향을 분석한 결과 형식지를 중심으로 한 시스템 지향적 지식경영전략과 암묵지를 중심으로 한 인적 지향적 지식경영전략 모두 경쟁우위 정(+)의 영향을 미치는 것으로 나타났다. 또한 경쟁우위는 재무성과에 정(+)의 영향을 미치는 것으로 나타났다. 반면에 지식경영전략은 재무성과에 부(-)의 영향을 미치는 것으로 나타나, 지식경영전략은 호텔기업의 경쟁우위를 획득 유지시키며 이를 통해 재무성과에 영향을 미친다고 나타났다. 이는 호텔기업에 있어서 모든 지식자산(암묵지, 형식지)를 기반으로 한 지식경영의 중요성을 인식시키고, 보다 지식경영활동을 활성화함으로써 호텔기업의 기업성과를 제고시킬 수 있는 구체적인 실행방안을 제시하였다.