We report on the light-emitting diode (LED) characteristics of core-shell CdSe/ZnS nanocrystal quantum dots (QDs) embedded in TiO2thin films on a Si substrate. A simple p-n junction could be formed when nanocrystal QDs on a p-type Si substrate were embedded in ~5 nm thick TiO2 thin film, which is inherently an n-type semiconductor. The TiO2 thin film was deposited over QDs at 200˚C using plasma-enhanced metallorganic chemical vapor deposition. The LED structure of TiO2/QDs/Si showed typical p-n diode currentvoltage and electroluminescence characteristics. The colloidal core-shell CdSe/ZnS QDs were synthesized via pyrolysis in the range of 220-280˚C. Pyrolysis conditions were optimized through systematic studies as functions of synthesis temperature, reaction time, and surfactant amount.

Ba(Ti,Sn)O3 thin films, for use as dielectrics for MLCCs, were grown from Sn doped BaTiO3 sourcesby e-beam evaporation. The crystalline phase, microstructure, dielectric and electrical properties of films wereinvestigated as a function of the (Ti＋Sn)/Ba ratio. When BaTiO3 sources doped with 20~50mol% of Sn wereevaporated, BaSnO3films were grown due to the higher vapor pressure of Ba and Sn than of Ti. However, itwas possible to grow the Ba(Ti,Sn)O3 thin films with ≤15mol% of Sn by co-evaporation of BTS and Ti metalsources. The (Ti＋Sn)/Ba and Sn/Ti ratio affected the microstructure and surface roughness of films and thedielectric constant increased with increasing Sn content. The dielectric constant and dissipation factor ofBa(Ti,Sn)O3 thin films with ≤15mol% of Sn showed the range of 120 to 160 and 2.5~5.5% at 1KHz,respectively. The leakage current density of films was order of the 10−9~10−8A/cm2 at 300KV/cm. The researchresults showed that it was feasible to grow the Ba(Ti,Sn)O3 thin films as dielectrics for MLCCs by an e-beamevaporation technique.

Microstructure and mechanical properties of WC-3wt% Co cemented carbides, fabricated by a sparkplasma sintering (SPS) process, were investigated in this study. The WC-3wt%Co powders were sintered at900~1100oC for 5min under 40MPa in high vacuum. The density and hardness were increased as the sinteringtemperature increased. WC-3wt%Co compacts with a relative density of 97.1% were successfully fabricated at1100oC. The fracture toughness and hardness of a compact sintered at 1100oC were 21.6MPa·m1/2 and4279Hv, respectively.

High-energy mechanical milling (HEMM) and sintering into Al-Mg alloy melt were employed tofabricate an Al alloy matrix composite reinforced with submicron and micron sized Al2O3 particles. Al-basedmetal matrix composite (MMC) reinforced with submicron and micron sized Al2O3 particles was successfullyfabricated by sintering at 1000oC for 2h into Al-Mg alloy melt, which used high energy mechanical milled Al-SiO2-CuO-ZnO composite powders. Submicron/micron-sized Al2O3 particles and eutectic Si were formed by in situdisplacement reaction between Al, SiO2, CuO, and ZnO during sintering for 2h into Al-Mg alloy melt and werehomogeneously distributed in the Al-Si-(Zn, Cu) matrix. The refined grains and homogeneously distributedsubmicron/micron-sized Al2O3 particles had good interfacial adhesive, which gives good wear resistance withhigher hardness.

LaFeO3 powders were synthesized using a method involving solution combustion, and the surfaceproperties of these powders were examined by x-ray photoelectron spectroscopy. As the amount of fuelincreased during the synthesis, the LaFeO3 powders became amorphous with a large plate-like shape. It wasfound that the O 1s spectra were composed of two types of photoelectrons by deconvolutioning the spectra.Photoelectrons with higher binding energy come from adsorbed oxygen (O−) whereas those with lower energycome from lattice oxygen (O2−). The ratio of adsorbed and lattice oxygen increased as the ratio of the fuel andnitrate (Φ) increased. The binding energy of both types of oxygen increased as Φ increased due to the formationof carbonates.

In this paper, a novel non-vacuum technique is described for the fabrication of a CuInSe2 (CIS) absorber layer for thin film solar cells using a low-cost precursor solution. A solution containing Cu- and Inrelated chemicals was coated onto a Mo/glass substrate using the Doctor blade method and the precursor layer was then selenized in an evaporation chamber. The precursor layer was found to be composed of CuCl crystals and amorphous In compound, which were completely converted to chalcopyrite CIS phase by the selenization process. Morphological, crystallographic and compositional analyses were performed at each step of the fabrication process by SEM, XRD and EDS, respectively.

Porous HAp with three-dimensional network channels was prepared in a polymer foam process using a in-situ formation. HAp/polyol with various HAp solid contents was formed with an addition of isocyanate. Under all conditions, the obtained porous HAp had pore sizes ranging 50 μm to 250 μm. The influence of the HAp content on the physical and mechanical properties of porous HAp scaffolds was investigated. As the solid content increased, the porosity of the porous HAp decreased from 79.3% to 77.9%. On the other hand, the compressive strength of the porous HAp increased from 0.7 MPa to 3.7 MPa. With a HAp solid content of 15 g, the obtained porous HAp had physical properties that were more suitable for scaffolds compared to other conditions.

Adsorption is one of the most efficient method for the separation of low level carbon dioxide. In order to enhance the adsorption capacity, a few additives such as alkali hydroxides were combined with the zeolitic sorbents. As a result of the experimental examination by applying the CO2 flow of 3000 ppm, the composite sorbent showed the improved quality to a certain degree and the added binder was also found to contribute to better adsorption.

Measurement is used for evaluation of product or process exactly. If it couldn't measured correctly, Quality-cost must be raised and it would be hard to improve product quality. So, this study suggests improvement guide line for the multilateral problems of measuring instrument operation based on the investigation of 157 small and medium-sized enterprises in February, 2008. To use inspection gig correctly, man who treat it must be accustomed with the structure, the performance, the method. The inspection gig is selected properly for the measurement goal. If not, results couldn't be correctly or wasted time, efforts, and costs. When selecting a inspection gig, the locating, the clamping, and the efficiency must be considered.

직물의 결점은 원단손실을 가중시키기 때문에, 검단공정에서 결점부위를 제거한다. 실제공장에서 이뤄지는 검단공정은 육안판정방식과 전자동 방식 중 하나를 채택하는데, 두 방식 나름대로 장단점이 있다. 본 연구에서는 육안판정과 전자동 방식의 장점만을 모아 검출은 사람이 하지만, 결점위치 정보 제공 및 결점정보 기록을 컴퓨터가 하도록 반자동 검단기를 개발하였다. 본 연구에서 개발한 레이저 그리드는 결점의 위치를 검단자가 쉽게 파악하도록 돕는 역할을 하며, 야드미터는 자동으로 결점의 위치를 측정하는 역할을 한다. 컴퓨터는 야드미터로 측정된 직물의 길이와 사람이 검출한 결점의 위치정보를 받아들여 저장하고 직물의 결점정보를 한눈에 보여주는 역할을 한다. 실제 사용되는 직물을 대상으로 특정 패턴으로 재단했을 때의 손실률을 계산하여 개발된 시스템의 성능을 객관적으로 평가하였다.

본 연구에서 졸-겔 방법에 의하여 나노 기공을 가지는 세라믹막을 제조하여 단일 조성의 헬륨과 질소를 가지고 기체투과 실험을 수행하였다. 기공 크기 0.1 μm, 기공율 32%의 평막형 α-Al2O3 지지체를 제조하였으며, 지지체를 담지하여 코팅하는 방법으로 4nm의 기공 크기를 가지는 γ-Al2O3 중간층을 제조하였다. 실리카 졸은 TEOS의 산 촉매 가수분해와 축중합반응을 통하여 합성하였다. 막은 딥코팅과 소결과정을 거쳐 제조되었다. 졸-겔 법에 의해 합성된 세라믹 막을 통한 헬륨, 질소 투과 실험은 기체의 투과 특성을 파악하기 위하여 시행하였다. 질소에 대한 헬륨의 선택도는 100∼160 정도였으며 헬륨의 투과도는 303∼363 K의 온도 범위에서 10 -7 mol/m 2 ⋅s⋅Pa 정도였다.

본 연구에서는 높은 투과도를 갖는 고분자량의 PTMSP를 합성하고 PTMSP와 hydroxy-terminated PDMS로부터 PTMSP-PDMS graft copolymer를 합성하였다. 그리고 PTMSP-PDMS graft copolymer에 TEOS의 함량을 15, 30, 50 wt%로 달리하여 졸-겔 방법에 의해 PTMSP-PDMS-silica 복합물을 제조하였다. PTMSP-PDMS-silica/PEI 복합막의 물리화학적 특성은 1H-NMR, FT-IR, TGA, XPS, GPC, SEM 등을 사용하여 조사하였고, H2, O2, N2, CO2, CH4, n-C4H10 기체에 대한 기체 투과도와 선택도 성질을 고찰하였다. 복합막의 투과도는 TEOS의 함량과 압력이 증가함에 따라 증가하였다. 그리고 기체들의 선택도는 TEOS 함량 30wt%에서 최대값을 나타내고 그 이상에서는 감소하는 경향을 나타내었다.

지하수나 폐수 등에 포함된 독성을 가진 음이온류나 양이온류 등의 유독물질을 경제적으로 처리하는데 탁월한 분리기능을 가진 것으로 알려진 전기투석공정에 사용하기 위해 음이온 교환 복합막을 제조하여 그 전기화학적인 특성을 조사하였다. 다양한 조성의 vinylbenzylchloride (VBC)와 divinylbenzene (DVB) 그리고 α,α-azobis(isobutyronitrile) (AIBN)으로 이루어진 단량체 용액에 다공성 지지체인 poly(ethylene) (PE)을 함침한 후 열중합 가교시켜 poly(VBC-DVB)/PE 복합막을 생성한 다음 trimethylamine(TMA)과 acetone을 이용해 음이온 교환기(-N + (CH3)3)를 함유하는 복합막을 제조하였다. 음이온 교환막 제조시 VBC/DVB의 비율과 TMA/Acetone의 비율에 따른 막의 함수율, 이온교환용량(IEC) 및 전기저항을 조사하였다. 그 결과 제조된 막들은 사용된 PE지지체의 얇은 막두께에 기인하여 아스톰사의 상용화 음이온 교환막(AMX)보다 높은 IEC와 낮은 전기저항 및 낮은 함수율 등을 나타내는 것을 확인할 수 있었다. 본 실험에서 제조된 복합막은 저렴한 제조비용과 우수한 전기화학적 특성으로 정수 및 폐수처리를 위한 전기투석공정에 충분히 적용될 수 있음을 알 수 있었다.

폴리비닐리덴플로라이드(PVDF) 지지체 위에 빗살모양의 술폰화된 공중합체를 코팅하여 나노 분리막을 제조하였다. 빗살모양의 공중합체는 원자전달 라디칼 중합법(ATRP)에 의해 제조하였으며, 폴리비닐클로라이드의 주사슬과 폴리스티렌 술폰산(PSSA)의 곁사슬로 구성되어 있다. 핵자기 공명법(1 H-NMR), FT-IR분광학 그리고 WAXS 분석법에 의해 공중합체가 성공적으로 합성되었음을 확인하였다 PVC-g-PSSA로 구성된 복합 나노 분리막은 PSSA의 함량이 증가함에 따라 플럭스와 배제율 모두 증가하였다. 이러한 성능 향상은 분리막의 술폰산의 함량의 증가로써 설명할 수 있다. PSSA가 71wt%첨가된 나노 복합막의 배제율은 Na2SO4 88%, NaCl 33%을 나타내었고, 플럭스는 Na2SO4 26, NaCl 34 L/m 2 h을 각각 나타내었다.

xTiO2-ySiO2 system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area were measured. Considering the efficiency of the ethanol and phenol degradation using the catalyst, the conclusions were obtained as follows: By means of X-ray analysis of xTiO2-ySiO2 powder that is obtained from Titanium and Silicon alkoxide by sol-gel process, it is shown that crystal structure of anatase type is a dominating structure and, on the other hand, the structure of rutile also partly exists. The increase of SiO2 contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. It is shown that more than 90% of ethanol and phenol are degraded when reaction time is about three and an hours, and the maximum degradation rate of ethanol and phenol is shown in 60TiO2-40SiO2 catalyst.

This study try introduce a cell manufacturing form and to make the productivity in a conveyor line manufacture for the customer requirement and market change. The case research from JIT theory that made the model to make a productivity enhance through the cell line in a conveyor line and U-line. This research was subject with a cosmetics manufacture company, therefor we can raise the quality enhance, personnel expenses and reduction of delivery effectiveness in a stroke types of industry consequently.

큰느타리버섯 재배에 있어 원균의 보존 및 증식기술은 아주 핵심적인 부분으로 취급되고 있다. 이를 위해 대부분 의 농가에서는 상업용 합성배지를 구입하여 사용하고 있 으나 과도한 비용부담은 균주 관리 소홀로 이어져 종균제 조에 있어 많은 피해를 야기 시키고 있다. 본 연구에서는 버섯재배에 이용되는 배지재료를 이용하여 합성배지를 대체할 수 있는 원균증식용 천연배지 제조 가능성에 대해 조사하였다. 각각의 배지 재료를 이용하여 조합한 뒤 열수 추출된 것을 원균증식을 위한 고체배지로 이용한 결과 포 플러:밀기울:미강 (50:20:30, v/v) 또는 포플러:밀기울:미 강 (50:30:20, v/v) 조건에서 합성배지 (36.3mm/7일) 보다 우수한 균사생장능력을 보여준다는 사실을 확인하였다. 이들 천연배지에서 유래된 큰느타리버섯 원균을 이 용하여 버섯재배에 이용한 결과 에서도 균사배양 기간이 23.6일 정도로 합성배지를 이용한 배지 (24.7일) 보다 약 1.0 일정도 단축되었으며, 버섯의 정상적인 생육 및 수확 도 가능 하였다.