• 한국세라믹학회지
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• 제47권1호
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• pp.75-81
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• 2010

The feasibility of using the thin film technology in utilizing lanthanum strontium manganite (LSM) for a solid oxide fuel cell (SOFC) cathode in a low-temperature regime is investigated in this study. Thin film LSM cathodes were fabricated using pulsed laser deposition (PLD) on anode-supported SOFCs with yttria-stabilized zirconia (YSZ) electrolytes. Although cells with a 1 ${\mu}m$-thick LSM cathode showed poor low-temperature cell performance compared to that of a cell with a bulk-processed cathode due to the lack of a triple-phase boundary length, the cell with 200 nm-thick gadolinia-doped ceria (GDC) inserted between the LSM and YSZ showed enhanced performance and more stable operation characteristics in a comparison of a cell without a GDC layer. We postulate that the GDC layer likely improved the cathode adhesion, therefore contributing to the improvement of the cell performance instead of serving as an interfacial reaction buffer.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.314-315
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• 2008

We have studied a property change of organic light-emitting diodes (OLED)s due to a surface reformation of indium-tin-oxide(ITO) substrate. An ITO is widely used as a transparent electrode in light-emitting diodes, and the OLEDs device performance is sensitive to the surface properties of the ITO. The ITO surface reformation could reduce the Schottky barrier at the ITO/organic interface and increase the adhesion of the organic layer onto the electrode. We have studied the characteristics of OLEDs with a treatment by a wet processing of the ITO substrate. The self-assembled monolayer(SAM) was used for wet processing. The characteristics of OLEDs were improved by SAM treatment of an ITO in this work. The OLEDs with a structure of ITO/TPD(50nm)/$Alq_3$(70nm)/LiF(0.5nm)/Al(100nm) were fabricated, and the surface properties of ITO were investigated by using seneral characterization techniques. Self-assembled monolayer introduced at the anode/organic interface gave an improvement in turn-on voltage, luminance and external quantum efficiency compared to the device without the SAM layer. SAM-treatment time of the ITO substrate was made to be 0/10/15/20/25min. The current efficiency of the device with 15min. treated SAM layer was increased by 3 times and the external quantum efficiency by 2.6 times.

• 마이크로전자및패키징학회지
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• 제12권3호
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• pp.213-217
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• 2005

ITO(indium tin oxide)/Glass 기판위에 정공 수송층으로 PEDOT:PSS[poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)]과 발광층으로 MEH-PPV[poly(2-methoxy-5-(2-ethyhexoxy)-1,4phenylenvinylene)]의 고분자를 사용하여 ITO/PEDOT:PSS/MEH-PPV/Al 구조를 갖는 고분자 유기 발광다이오드 (polymer light emitting diode: PLED)를 제작하였다. 고분자 유기 발광다이오드 제작시 MEH-PPV의 농도$(0.1\;wt\%\~0.9\;wt\%)$가 발광층 표면 거칠기와 박막층판의 마찰계수(friction coefficient)에 미치는 영향을 조사하였다. MEH-PPV의 농도를 $0.1\;wt\%$에서 $0.9\;wt\%$로 증가함에 따라 발광층의 RMS 값은 1.72 nm 에서 1.00 nm로 감소하여 거칠기가 개선되는 경향을 보여 주었다. 또한 발광층 박막의 마찰계수는 0.048에서 0.035로 감소하여 박막의 접합상태가 나빠지는 현상을 나타내었다. $0.5\;wt\%$의 농도를 갖는 PLED 다이오드에서 최대 휘도인 $409\;cd/m^2$ 값을 얻었다.

• 대한족부족관절학회지
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• 제21권4호
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• pp.151-155
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• 2017

Purpose: Reducing tenderness or pain on the ankle joint and improving the range of motion are thought to be possible using hyaluronate-based anti-adhesive agents. On the other hand, there are more aspects to be studied regarding the incidence of complications, such as resting pain, tenderness, and stiffness, after surgery. Therefore, the aim of this study was to prove the effectiveness of the agents after ankle fracture surgery. Materials and Methods: Patients, who underwent open reduction and internal fixation surgery due to ankle joint fractures from June 2015 to May 2016, were studied prospectively. Thirty patients of them received a $Guardix^{(R)}$ injection during their surgeries and were included in the injection group. The other 30 patients were included in the control group. Postoperatively, tenderness on the scar, a delay in wound healing, and the active range of motion were evaluated at 2, 6, and 12 weeks after surgery. Results: A significant difference in tenderness on the scar was observed 2 weeks after surgery. On the other hand, there was no significant difference at 6 and 12 weeks after the surgery. The agent-using group showed a 6.7% delay in wound healing and a 93.3% nondelaying. In the non-using group, the delay was 63.3%, while non-delay was 36.7% (p<0.001). The group that underwent $Guardix^{(R)}$ usage showed an effective result in the visual analogue scale, which was statistically significant (p<0.001). The result at 6 and 12 weeks after surgery showed a significant difference. Conclusion: Improvement was observed in the patients who underwent a $Guardix^{(R)}$ injection, regarding the range of motion, visual analog scale, and healing of the wound postoperatively.

• 한국건설순환자원학회논문집
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• 제1권3호
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• pp.233-239
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• 2013

콘크리트의 표면보호제은 표면으로부터 함침제를 함침시켜 표층부의 개질을 목적으로 사용하며 주로 Silane계 및 Silicate계 재료가 사용된다. 일반적으로 이용되는 Silicate는 Sodium과 Lithium silicate이며 탄산화한 부분의 알칼리 부여와 성능저하가 예상되는 콘크리트 부재의 구체 강화 등 성능회복을 목적으로 사용한다. 본 연구에서는 Self-Cleaning 실리케이트계 콘크리트 표면보호제로서 TEOS, $TiO_2$, Lithium silicate를 사용하여 노출 및 컬러 콘크리트 등의 고기능성이 요구되는 건축물에 적용이 가능한 Self-Cleaning 실리케이트계 콘크리트 표면보호제를 제조하였다. 또한 제조된 표면보호제의 건축물 적용을 위한 표면접촉각, 방오성능, 표면특성 및 조직관찰 등의 성능을 검토하였다. 실험결과 Self-Cleaning 실리케이트계 콘크리트 표면보호제를 적용한 시험체는 접촉각 $20^{\circ}$ 이하의 친수성을 보였고 기능성 부여가 가능하므로 표면보호제로서 사용이 가능하다.

• Advances in pediatric surgery
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• 제7권2호
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• pp.118-125
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• 2001

The effectiveness of operative and non-operative management for postoperative adhesive ileus in children has been discussed. This study reviews the clinical characteristics and the treatment consequences of adhesive ileus in our institution. Department of Surgery of Chunbuk National University Hospital, retrospectively. A total of 62 cases of post-operative small bowel obstruction treated between January 1975 and December 1998 under the 15 years of age are included in this study. The patients were divided into two groups, operative(n=26) and non-operative(n=36) groups. The prevalent age was between 11 and 15 years(28 cases; 45.2 %), and the most common previous operation was appendectomy(28 cases; 45.2 %). The most common operative procedures were adhesiolysis(17 cases; 65.4 %). The interval between admission and operation was 1 day in 11 cases(42.3 %). The most common site of adhesion was the ileum in 13 cases(50.0 %) and band constriction was the most frequent pattern(8 cases; 30.8 %). Intestinal resection was significantly high in delayed operations of more than four days, in the patients with three or more classical signs of strangulation(fever, tachycardia, leukocytosis, abdominal pain, rebound tenderness), and in the cases of complete obstruction on plain abdomen film(p < 0.05). In conclusion, operation should be considered in cases with three or more signs of strangulation, no clinical improvement for over four days of conservative treatment, and signs of complete obstruction on plain abdomen film during the observation periods.

• 약학회지
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• 제54권6호
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• pp.500-506
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• 2010

TNF-${\alpha}$ and VCAM-1 play a pivotal role in the pathogenesis of rheumatoid arthritis, and the development of drugs targeting these molecules has extended the therapeutical approaches to rheumatoid arthritis patients. Bispecific antibodies combine the antigen-binding sites of two antibodies within a single molecule and thus they are able to bind to two different epitopes simultaneously. A specific bispecific antibody format termed "Di-diabody" was made for the efficient approach to anti-inflammation. In this study, the DNA vector construct of Di-diabody was built up against two antigens, VCAM-1 and TNF-${\alpha}$. For evaluating this Di-diabody as a bispecific antibody on the efficacy of anti-inflammation, the proteins were analyzed according to each antigen binding affinity and cell based assay related separate molecules. The 7H/Humira Di-diabody produced in this study interacted with its ligands, VCAM-1 and TNF-${\alpha}$, respectively. Also, this antibody exhibited the similar functional activities as compared to 7H-IgG in respect to inhibition of hVCAM-1-induced cell adhesion and Humira-IgG in respect to inhibition of TNF-${\alpha}$ induced cytotoxicity. Further study to elucidate the pharmacological significance of the Di-diabody is warranted using experimental animals.

• 한국재난정보학회 논문집
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• 제10권4호
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• pp.566-571
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• 2014

내구성은 콘크리트 구조물의 안전성과 경제성에 직접적으로 연관되므로 매우 중요한 사항인데, 최근 들어 콘크리트의 내구성에 사회적, 공학적 관심이 집중되면서 이에 대한 다양한 연구가 진행되고 있다. 콘크리트의 염해나 탄산화, 동결융해 등의 열화요인은 독립적이 아닌 복합적인 형태로 작용하게 되는데, 이러한 열화현상을 저감하는 한 방편으로 사용하는 플라이 애쉬는 콘크리트 혼화재 중에서 사용빈도가 매우 높다. 또한 플라이 애쉬는 유동성 증진을 통한 내구성의 향상과, 수화열 저감을 통한 균열감소 및 장기강도 증진 등의 효과가 있으며, 시멘트를 대체하여 결합재로서 경제적인 효과를 유발하는 장점도 가지고 있다. 그러나 플라이 애쉬는 그 품질의 편차가 크고, 경우에 따라서 미연 탄소분에 의한 AE제 흡착 등으로 인하여 콘크리트의 내구성 및 강도를 저하시킬 수 있는 요소를 내포하고 있으므로 사용 시 주의가 필요하다. 본 연구에서는 다양한 치환율의 플라이 애쉬를 혼입한 콘크리트를 경화 전후에 특성실험을 한 다음, 그 결과를 분석 고찰함으로써 열화를 저감하고, 내구성을 갖는 콘크리트를 제조하기 위하여 혼화재 및 결합재로서의 적용성 및 타당성을 검증하고자 한다.

• Archives of Plastic Surgery
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• 제40권6호
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• pp.773-778
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• 2013

Background In the management of mallet deformities, oblique retinacular ligament (ORL) reconstruction provides a mechanism for automatic distal interphalangeal (DIP) joint extension upon active proximal interphalangeal joint extension. The two variants of ORL reconstruction utilize either the lateral band or a free tendon graft. This study aims to compare these two surgical techniques and to assess any differences in functional outcome. As a secondary measure, the Mitek bone anchor and pull-in suture methods are compared. Methods A single-institutional retrospective review of ORL reconstruction was performed. The standard patient demographics, injury mechanism, type of ORL reconstruction, and pre/postoperative degree of extension lag were collected for the 27 cases identified. The cases were divided into lateral band (group A, n=15) and free tendon graft groups (group B, n=12). Group B was subdivided into the pull-in suture technique (B-I) and the Mitek bone anchor method (B-II). Results Overall, ORL reconstructions had improved the mean DIP extension lag by $10^{\circ}$ (P=0.027). Neither the reconstructive technique choice nor bone fixation method identified any statistically meaningful difference in functional outcome (P=0.51 and P=0.83, respectively). Soft-tissue injury was associated with $30.8^{\circ}$ of improvement in the extension lag. The most common complications were tendon adhesion and rupture. Conclusions The choice of the ORL reconstructive technique or the bone anchor method did not influence the primary functional outcome of extension lag in this study. Both lateral band and free tendon graft ORL reconstructions are valid treatment methods in the management of chronic mallet deformity.

• 한국응용과학기술학회지
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• 제29권1호
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• pp.141-148
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• 2012

본 연구에서는 초소수성 실리카 에어로겔을 이용하여 단열 성능을 갖는 투명 필름용 유/무기 복합 코팅물질을 제조하였다. 바인더 물질로 사용된 자외선 경화형 우레탄 아크릴레이트 수지와 에어로겔과의 상용성을 위해 계면활성제(Brij 56)를 이용하여 에어로겔의 표면을 개질하였다. 개질된 에어로겔을 고분자 수지와 복합화한 코팅 용액을 폴리카보네이트 기지재에 코팅한 후 자외선경화를 통해 코팅필름을 제조하였다. 에어로겔이 10 vol% 함량으로 첨가되었을 때, 코팅필름의 단열성능은 측정된 열전도도 기준으로 순수 기지재 대비 28% 정도로 향상되었다. 또한, 코팅필름의 광투과율은 에어로겔이 50 vol%로 과량 첨가된 경우에도 80% 이상 높은 수준을 유지하였으며, 우수한 접착성(5B) 및 연필 경도(4H)를 보여주었다.