Poly(vinyl alcohol) nanocomposites containing reduced graphene oxide coated with tannic acid for humidity sensor

Lim, Min-Young,Shin, Huiseob,Shin, Dong Myung,Lee, Sang-Soo,Lee, Jong-Chan Elsevier 2016 Polymer Vol.84 No.-

<P><B>Abstract</B></P> <P>Poly(vinyl alcohol) (PVA) nanocomposites were prepared by a solution casting method using a reduced graphene oxide coated with tannic acid (rGO-TA) as a filler. The rGO-TA was simply prepared by mixing tannic acid (TA) with graphene oxide (GO). The simple mixing process was found to be effective to reduce GO and to produce covalently-grafted TA layers on the reduced GO. The mechanical properties of PVA were much improved by the addition of rGO-TA because the TA layers increased the compatibility of the reduced GO with PVA matrix. For example, Young's modulus and elongation at break values of PVA were increased by 34.0 and 56.9%, respectively, by adding 1.0 wt% of rGO-TA. In addition, the PVA nanocomposites showed excellent humidity sensing properties over the wide relative humidity range and the long-term stability due to the conductive property of the reduced GO and the enhanced mechanical strength by the effective incorporation of rGO-TA into the PVA matrix.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The rGO-TA was prepared by a facile and green method using a low-cost tannic acid. </LI> <LI> The effect of rGO-TA on the properties of PVA nanocomposites has been studied. </LI> <LI> The rGO-TA improved the important properties for PVA-based humidity sensors. </LI> <LI> The PVA/rGO-TAs are promising materials for high-performance humidity sensors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

동하중 측정 신호처리의 개발에 관한 연구

신영균,이영준,박찬원,신형재,안광희 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

A high speed and stable A/D conversion data process is required to weigh a mass on moving conveyer weighing platter. The paper presents a new method to obtain stable and fast automatic weighing A/D conversion data process. Dynamic weighting system which is constructed with dual load cell is realized by the stable A/D conversion data preocess algorithm using DSP. The proposed memthod is applied to the real design, and that experimental results showed good performances of the weighing stability.

장력구동방식의 역감제시 시스템

신석두,강원찬,오금곤,김영동 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2

In this paper, we have developed a new Force-Display system using tendon-driven method. The proposed system is based on the HIR Lab Haptic library, which calculates the real position and renders the reflecting force data to device rapidly. The system is composed of device based tendon-driving method, high-speed controller and Haptic rendering library. The developed system will be used on constructing the dynamical virtual environment. To show the efficiency of our system, we designed simulation program which can display the moving force (attaching, grabbing, rotating) on two virtual point. As the result of the experiment, our proposed system shows much higher resolution than any others.

폐분체 도료의 재활용 방안에 관한 연구

신동철,김영훈,이순기,김경원,신선명,강헌찬 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

With the progress of industry, the much more demand of paint around us grows rapidly. However, the whole quantity of raw materials used to make powder coatings is presently imported to fill the domestic needs. Moreover, it is well known that the waste powder coatings from the domestic industries are mostly incinerated. The method of destructing the waste powder coatings by fire causes VOC to be generated, and this results in some serious environmental problems such as air pollution and so on. Therefore, the effective and proper measure must be devised to reuse the waste powder coatings for the purpose of eliminating waste of resources and avoiding the outflow of foreign currency. This study aims to make the plan to recycle the waste powder coatings, and its conclusion is drawn as follows: First, it can be seen that the waste powder coatings with a weak electrostatic power restore gradually to the original state of electrostatic power through the process of fusion and retreatment. Second, it can be estimated that those coatings, with the use of the cyclon, can be removed by dividing a powder of particles less than 10㎛. Third, it can be ascertained that the possibility of reusing the waste powder coatings is proved when it is divided into particles by cyclon and a revolving screen after the process of fusion, rolling, crushing and pulverization.

苛性소다 處理에 依한 밀짚의 飼料價値 增進 硏究

辛炯泰,金贊昊,金鍾奭,宋永祿,林泰鎭 成均館大學校 1982 論文集 Vol.32 No.-

Nylon bag dry matter digestibility (NBDMD, %), nylon bag organic matter digestibility (NBOMD, %) and chemical compositions were analysed to evaluate the nutritive values of 5 varieties of NaOH-treated wheat straws (Jangkwang, Wonkwang, Suwon 210, Suwon 211, Naemil) by using Korean native male goats. Three grams of dried samples by grinding with 2.45㎜ Wiley mill screen were put into a bag 9×14㎠ made of 100 mesh nylon. These bags were put into the ventral sac of the rumen and taken out at the end of 72 hours. They were washed, dried in an oven at 105℃ for 24 hours and weighed “NBDMD” (%) and ashed in an muffle furnace at 600℃ or 24 hours and weighed “NBOMD”(%). The results which were obtained with this experiment were as follows: 1. Nylon bag dry matter digestibility (NBDMD, %) and nylon bag organic matter digestibility (NBOMD, %) of NaOH-treated wheat straws were highly significant different (p<0.01) in different levels of NaOH treatment and of different varieties of wheat straws. 2. The relationship between total mean NBDMD (%, Y_1) of 5 varieties of wheat straws and NaOH concentration (%, X) at 72 hours rumen incubation was: Y_1=34.57+3.56X(r=0.92^**) 3. The relationship between total mean MBOMD (%, Y_2) of 5 varieties of wheat straws and NaOH concentration (%, X) at 72 hours rumen incubation was: Y_2=32.02+2.46X(r=0.92^**) 4. The orders of NBDMD(%) and NBOMD(%) for 5 varieties of wheat straws were Suwon 210, Suwon 211, Naemil, Jangkwang, Wonkwang and Suwon 211, Suwon 210, Naemil, Jangkwang, Wonkwang, respectively. 5. The optimum level of NaOH for improving NBDMD(%) from 5 varieties of wheat straws, on the basis of Blaxter et al. (1961), was 6% NaOH.

인삼에 있어 변조 장뇌삼 판별에 대하여

정찬문,신주식,이이,장세영 충북대학교 연초연구소 2004 煙草硏究 Vol.19 No.-

시장에서 시판되고 있는 장뇌삼을 재료로 하여 변조 특성 및 이들 변조삼의 진위여부를 판별하고자 그 특성을 조사하였다. 장뇌삼의 변조는 뇌두와 뿌리부위를 주로 변조하는 것으로 나타났다. 뇌두부위는 경흔적수와 수근수를 늘리던가 아니면 뇌두를 장뇌로 변조하였고 뿌리 부위는 지근수 및 지근장을 늘리는 것으로 나타났다. 변조한 뇌두부위의 특징은 먼저 뇌두하단에 있는 동체의 중심주를 요(凹)모양으로 만들고 변조한 뇌두를 철(凸)모양으로 깍아 심지 박듯이 맞추는 것이었다. 또한 각기 다른 인삼의 뇌두를 교묘히 잇대어 장뇌로 만들었고 여기에 수근을 접착하여 오래된 진짜 산삼 형태와 유사하게 변조하였다. 그리고 뿌리부위는 접착면을 절편 자르듯 사선으로 잘라 접착면이 많게 하였고 후에 이들 접착면을 비벼 흔적을 없애는 수법이었다. 변조에 사용된 재료는 인삼 및 출처불명의 약초뿌리를 사용하였고 접착제는 공업용으로 접착성이 강한 것을 사용하였다. For identification of altering methods and distinction of altered long-rhizome ginseng, we studied the properties of long-rhizome ginseng which is being sold in market. Artificial long-rhizome ginsengs were made by modification of rhizomes and roots. Artificial long rhizomes were made by increasing the number of stem vestige root and rhizome root or by modification of rhizome to long-rhizome. Roots were modified by increasing of the number and the length of secondary roots. Artificial long rhizomes were made by carving the rhizome in concave shape and attaching convex shaped modified another rhizome. Those who make artificial ginseng made the altered long-rhizome ginseng looks like real long-aged wild ginseng by elongation of the rhizome by attaching many ginseng rhizomes and attaching of secondary roots. They cut the attaching surface obliquely for increased number of attaching point and removed the vestige by scrubbing the attaching region. They used ginseng, medicinal plant from doubtful origin, and industrial strong adhesives for making altered long-rhizome ginseng.

쇄골 간부 골절 불유합의 수술적 치료 : 재건 금속판 고정 및 골 이식술 Reconstruction Plate Fixation and Bone Grafting

변영수,유찬훈,안혁수,문성건,신동주,박준우 대한골절학회 2003 대한골절학회지 Vol.16 No.2

목 적: 쇄골 간부 골절 불유합에 대하여 관혈적 정복, 재건 금속판 고정 및 골 이식을 시행하고 술후 조기 관절 운동을 허용한 저자들의 경험을 보고하는 것이다. 대상 및 방법: 1997년 1월부터 2001년 12월까지 수술적 치료를 시행한 쇄골 간부 골절 불유합 16예를 대상으로 하였다. 위축성 불유합이 10예, 비후성 불유합이 6예였으며, 수상 후 불유합에 대한 수술까지의 기간은 평균 6.5개월이었다. 수술적 치료로 불유합 부위를 노출시켜 섬유조직을 제거하고 골수강을 천공하였으며, 골편을 정복하고 재건 금속판으로 고정하였으며, 자가 골 이식을 하였다. 수술 후 관절 운동은 1주일 이내에 시작하였다. 결 과: 평균 추시 기간은 22.0개월이었으며, 전 예에서 평균 10.0주에 골유합을 얻었다. 최종 추시 시의 견관절 운동범위는 전 예에서 정상으로 회복되었으며, 나이가 50게 이상인 6예 중 3예에서 동측 견관절에 간헐적인 동통을 호소하였다. 술후 감염, 재검 금속판의 파손, 고정상실, 불유합, 재골절 등의 합병증은 발생치 않았다. 결 론: 쇄골 간부 골절 불유합에 대한 관혈적 정복, 재건 금속판 고정 및 골 이식은 안정성 고정으로 조기 재활이 가능하고 견고한 골유합을 얻을 수 있어 안전하고 확실한 치료방법으로 사료된다. Purpose: The purpose of this study is to present out experience with open reduction, 3.5-㎜ reconstruction plate fixation, bone-grafting, and postoperative early mobilization for nonunions of midshaft clavicular fratures. Materials and Methods: Sixteen patients were treated operatively for nonunions of the midshaft of the clavicle from 1997 to 2001. Ten nonunions were atrophic and six were hypertrophic. Nonunion had been present for an average of 6.5 months. The operative technique included removing the fibrous tissue from the nonunion site and opening the medullary canal, reduction of the fracture and fixation with a 3.5-㎜ reconstruction plate, and bone-grafting. Postoperative mobilization started within one week. Results: The average duration of follow-up was 22.0 months. All fracture were united in an average of 10.0 weeks. All patients had full range of motion of the ipsilateral shoulder, but 3 our of 6 patients who were more than 50 years old complained occasional pain in the ipsilateral shoulder at the final follow-up examination. There were no major complications of postoperative infection, metal failure of the plate, loss of fixation, nonunion, and refracture after removal of the implant. Conclusion: The technique of open reduction, reconstruction plate fixation, and bone-grafting is a safe and reliable method to allow early rehabilitation by stable fixation and to predict a high rate of union for nonunions of midshaft clavicular fractures.

위발성 위장관 악성림프종 환자에서 항암치료의 효과

김찬규,신영록,김현정,배상병,이남수,이규택,박성규,원종호,홍대식,박희숙 순천향대학교 2006 Journal of Soonchunhyang Medical Science Vol.12 No.1

Purpose: The gastrointestinal (GI) tract is the most common site of extranodal non-Hodgkin's lymphoma (NHL), which is increasing in incidence, but there is no established optimal treatment modality. Thus, this study was investigated the clinicohistologic feature, the therapeutic modalities, and the prognosis for GI-NHL, as well as the factors affecting it. Methods: We retrospectively analyzed 45 patients who had been diagnosed as having GI-NHL and had been followed up from July 1994 to February 2005 at Soonchunhyang University Hospital. The patients were divided into groups according to the site of origin and to various other features, and the survivals of the various groups were compared. The modified Ann Arbor system and WHO classification were adopted for staging and histopathologic classification, respectively. Results: GI-NHL of the stomach, small bowel, ileocecal region, and colon occurred in 28 patients (62.2%), 5 patients (11.1%), 3 patients (6.7%), and 8 patients (17.8%), respectively, In one patient, the entire gastrointestinal tract was diffusely involved. The median age of patients was b5 years (25~78 years), and male-to-female ratio was 1:1.1. Fourteen patients were in stage Ⅰ, 24 in stage Ⅱ, 4 in stage Ⅲ, and 3 in stage Ⅳ. Surgical resection was performed in 19 patients, and combination chemotherapy was performed in 43 patients. Surgical resection only was performed in 4 patients, Chemotherapy only was performed in 26 patients. The expected overall 5 year survival of 45 patients was 39.6%, and there was a significant survival difference between the stages, but between sites of origin (p=0.842). The most important factors influencing the survival was the stage and other factors were not significant. Conclusion: The stomach was the most common site of GI-NHL. Most GI-NHL were localized Stage was the most important prognostic factor. However, Prospective randomized studies are needed to approve the therapeutic modality.

만성 견비통에 대한 동씨침 치료의 무작위 대조군의 임상 연구

김찬영,권나현,신예지,남동우,김건형,김종인,최도영,이윤호,이재동 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2007 東西醫學硏究所 論文集 Vol.2007 No.-

Objectives : To observe the effect of acupuncture treatment in chronic shoulder pain patients. Methods : 36 voluntary patients were randomly assigned to an acupuncture treatment group(E GrouP, n=18) and a control group(C GrouP, n=18). The E Group patients received acupuncture treatment on LI_(15), TE_(14), GB_(21) and Master Dong's acupuncture points, Shin-gwan and Gyun-joong, twice a week for four weeks. The C Group patients received no treatment. All patients in both groups were instructed to practise self exercise in their daily lives. Evaluations were made at baseline and after four weeks of study. The Constant Shoulder Assessment(CSA), Shoulder Pain and Disability Index(SPADI) and the patient's subjective pain was measured by Visual Analogue Scale(VAS). The obtained data was analyzed. Results '. The E Group showed significant(p<0.05) improvement in CSA, SPADI and VAS after four weeks of treatment. The C Group showed significant(p<0.05) improvement in CSA, but the change of SPADI and VAS was insignificant(P>0.05). CSA and SPADI of E Group significantly(p<0.05) improved compared to the C GrouP, but the difference of VAS change in the two groups was insignificant(p>0.05). Conclusions : Four weeks of acupuncture treatment significantly improved CSA, SPADI and VAS. The improvement of CSA and SPADI was significant(p<0.05) compared to untreated patients.

충청도 지역 일대 저품위 질석의 팽창 특성에 관해서

강헌찬,김영훈,김광수,신선명 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1

The propose of this thesis was to study the usage of the low-grade Vermiculite from the Chung Chong province and also to increase its Value-added. A series of experiments have been done for separation as well as heat-expansion characteristics of the Chung Chong Vermiculite some conclusions can be drawn as follows; 1. Vermiculite from Chung-Yang and Hong-Shung areas wear better than that from Palabora's mine in South Africa in terms of the usefulness for an organic fertilizer. 2. The ratio of the volume expansion of Vermiculite increased along with the temperature. 3. In general, the ratio of volume expansion of the vermiculite from Chung-Yang, Hong-Shung and Palabora's mine in South Africa increased with temperature. But it decreased temporarily in the vicinity of 850℃. The result seems to be due to temporary decrease in the latent heat as the crystal water in the crystals such as Ca_(10)(Mg,Fe)₂A1₄Si_(9)O₃₄(OH)₄, K(Fe,Mg)₃AlSi₃O_(10)(OH)₂and K (Fe,Mg)₃AlSi₃O_(10)(OH)₂evaporated. 4. Above 1050℃, the crystal structure began to change and resulted in partial destruction to produce some dusts. Finally sintering occurred.