각형토기(角形土器)는 동체가 팽만하고 좁은 저부를 가진 기형을 중심으로 팽이와 흡사한 형태적 특징을 보인다.‘각형(角形)’이란 토기 명칭은 기형적 특징을 반영한 것으로 남한 내 무문토기의 명칭이 대표 출토지를 중심으로 부여된 점과 차이를 보인다. 이러한 명칭 차이는 남한 내 주요 토기가 아니란 인식에 따라 통일된 명칭을 부여할 필요성을 인지하지 못했기 때문으로 본다. 본고는 최근 경기 서북부지역에서 각형토기의 출토에 주목하면서 이 지역의 무문토기 출토양상을 검토하고자 한다. 이러한 목적 하에 기존 각형토기를 남한의 토기문화유형과 같이 대표적 출토지를 바탕으로‘신흥동식 토기’라 명명한다. 지역 내 전반적인 문화유형 양상을 규명하고자 경기 서북부지역 중 강화, 김포, 검단의 무문토기시 대 취락 현황을 검토하였다. 그 결과 김포와 검단은 역삼동문화유형권이며, 김포에서 흔암리식토기의 출토는 부재(不在)에 가까운 점을 확인하였다. 나아가 지역 내 각 토기의 출토 현황, 각 형식별 토기가 단독으로 출토된 주거지 사례 등을 살펴본 결과 지역마다 출토양상에 차이가 있음을 알 수 있었다. 이러한 문화유형을 기반으로 이 지역에서 출토된 이중구연토기의 계통성을 확인하고자 토기의 명목형·연속형 속성을 구분하여 검토하였다. 명목형 속성은 토기 구연부 문양을 중심으로 Ⅰ식 토기문 양(이중구연+사선 조합)과 Ⅱ식 토기문양(흔암리식토기)으로 구분된다. Ⅰ식 토기문양은 대동강유역 에서 출토된 신흥동식 토기문양과의 관련성을 중심으로 세분하고, Ⅱ식 토기문양은 이 지역에서 주로 출토된 문양을 중심으로 세분하였다. 연속형 속성은 이중구연의 길이, 이중구연 두께, 사선길이, 이중 구연 접합부 두께를 중심으로 계측이 가능한 토기 71점을 검토하였다. 경기 서북부지역은 남한 내 북쪽에 위치하며 서해안을 따라 다양한 유입 경로를 갖기에 북한과의 관계성을 간과할 수 없을 것이다. 궁극적으로 당시 무문토기문화가 단순하지 않으며 다양한 경로의 이주 및 유입으로 인한 혼재된 문화양상을 지녔을 것으로 본다.

Fecralloy coating layer with large surface area is suitable for use as a filter media for efficient removal of hot gaseous pollutants exhausted from combustion processes. For uniform preparation of a Fecralloy coating layer with large surface area and strong adhesion to substrate, electrospray coating and thermal treatment processes are experimentally optimized in this study. A nano-colloidal solution with 0.05 wt% Fecralloy nanoparticles is successfully prepared. Optimized electrospraying conditions are experimentally discovered to prepare a uniform coating layer of Fecralloy nanocolloidal solution on a substrate. Drying the electrospray coated Fecralloy nano-colloidal solution layer at 120oC and subsequent heating at 600oC are the best post-treatment for enhancing the adhesion force and surface roughness of the Fecralloy coating layer on a substrate. An electrospray coating system, consisting of several multi-groove nozzles, is also experimentally confirmed as a reasonable device for uniform coating of Fecralloy nano-colloid on a large area substrate

Bi2Te3 related compounds show the best thermoelectric properties at room temperature. However, n-type Bi2Te2.7Se0.3 showed no improvement on ZT values. To improve the thermolectric propterties of n-type Bi2Te2.7Se0.3, this research has Cu-doped n-type powder. This study focused on effects of Cu-doping method on the thermoelectric properties of n-type materials, and evaluated the comparison between the Cu chemical and mechanical doping. The synthesized powder was manufactured by the spark plasma sintering(SPS). The thermoelectric properties of the sintered body were evaluated by measuring their Seebeck coefficient, electrical resistivity, thermal conductivity, and hall coefficient. An introduction of a small amount of Cu reduced the thermal conductivity and improved the electrical properties with Seebeck coefficient. The authors provided the optimal concentration of Cu0.1Bi1.99Se0.3Te2.7. A figure of merit (ZT) value of 1.22 was obtained for Cu0.1Bi1.9Se0.3Te2.7 at 373K by Cu chemical doping, which was obviously higher than those of Cu0.1Bi1.9Se0.3Te2.7 at 373K by Cu mechanical doping (ZT=0.56) and Cu-free Bi2Se0.3Te2.7 (ZT=0.51).

Fecralloy is the promising materials for high temperature exhaust filtering system due to the excellent its oxidation resistance property. In this research, Fecralloy nanoparticles coated Fecralloy thin foil was prepared by a single nozzle electrospray system in order to increase surface area of Fecralloy foil. Fecralloy nanoparticles were fabricated by electrical wire explosion method in ethanol using Fecralloy wires as a source material. Electrospray modes with applied D.C voltages to Fecralloy colloidal solution were investigated to make a stable cone-jet mode. Coated layers with and without additional heat treatment were observed by FE-SEM (field emission-scanning electron microscope) and tape test for evaluating their adhesion to substrate were performed as well.

Thermoelectric-thick films were fabricated by using a screen printing process of n and p-type bismuth-telluride-based pastes. The screen-printed thick films have approximately 30 in thickness and show rough surfaces yielding an empty gap between an electrode and the thick film. The gap might result in an increase of an electrical resistivity of the fabricated thick-film-type thermoelectric module. In this study, we suggest a conductive metal coating onto the surfaces of the screen-printed paste in order to reduce the contact resistance in the module. As a result, the electrical resistivity of the thermoelectric module having a gold coating layer was significantly reduced up to 30% compared to that of a module without any metal coating. This result indicates that an introduction of conductive metal layers is effective to decrease the contact resistivity of a thick-film-typed thermoelectric module processed by screen printing.

Nano-sized BaNd2Ti5O14 powders were prepared by the spray pyrolysis process. Sucrose used as the organic additive enabled the formation of nano-sized BaNd2Ti5O14 powders. The powders prepared from the spray solution without sucrose had a spherical shape, dense structure and micron size before and after calcination. However, the precursor powders prepared from the spray solution with sucrose had a large size, and hollow and porous morphology. The precursor powders had an amorphous crystal structure because of the short residence time of the powders inside the hot wall reactor. The complete decomposition of sucrose did not occur inside the hot wall reactor. Therefore, the precursor powders obtained from the spray solution with sucrose of 0.5M had a carbon content of 39.2wt.%. The powders obtained from the spray solution with sucrose of 0.5M had a slightly aggregated structure of nano-sized primary powders of BaNd2Ti5O14 crystalline phase after calcination at 1000˚C. The calcined powders turned into nano-sized BaNd2Ti5O14 powders after milling. The mean size of the BaNd2Ti5O14 powders was 125 nm.

Fe powders with elongated and aggregated structure as heat pellet material for thermal battery applications were prepared by spray pyrolysis under various preparation conditions. The precursor powders with spherical shapes and hollow morphologies turned into Fe powders after reduction at a temperature of 615˚C under 20% H2/Ar gas. The powders had pure Fe crystal structures irrespective of the preparation conditions of the precursor powders in the spray pyrolysis. The morphologies and mean sizes of the Fe powders are affected by the preparation conditions of the precursor powders in the spray pyrolysis. Therefore, the ignition sensitivities and the burn rates of the heat pellets formed from the Fe powders prepared by spray pyrolysis are affected by the preparations of the precursor powders. The Fe powders prepared under the optimum preparation conditions have a BET surface area of 2.9 m2g1. The heat pellets prepared from the Fe powders with elongated and aggregated structure have a good ignition sensitivity of 1.1W and a high burn rate of 18 cms1.

In spray pyrolysis, the effects of the preparation temperature, flow rate of the carrier gas and concentration of the spray solution on characteristics such as the morphology, size, and emission intensity of Ca8Mg(SiO4)4Cl2:Eu2+ phosphor powders under long-wavelength ultraviolet light were investigated. The phosphor powders obtained post-treatment had a range of micron sizes with regular morphologies. However, the composition, crystal structure and photoluminescence intensity of the phosphor powders were affected by the preparation conditions of the precursor powders. The Ca8Mg(SiO4)4Cl2:Eu2+ phosphor powders prepared at temperatures that were lower and higher than 700˚C had low photoluminescence intensities due to deficiencies related to the of Cl component. The phosphor powders with the deficient Cl component had impurity peaks of Ca2SiO4. The optimum flow rates of the carrier gas in the preparation of the Ca8Mg(SiO4)4Cl2:Eu2+ phosphor powders with high photoluminescence intensities and regular morphologies were between 40 and 60 l/minute. Phosphor powders prepared from a spray solution above 0.5 M had regular morphologies and high photoluminescence intensities.

Green-emitting Ba1.468Sr0.5SiO4 : Eu0.012, Y0.02 phosphor powders under long-wavelength ultraviolet light were prepared via high-temperature flame spray pyrolysis from spray solutions with and without NH4Cl flux. The effects of the temperature of the diffusion flame and the NH4Cl flux on the morphologies, crystal structures and photoluminescence intensities of the Ba1.468Sr0.5SiO4 : Eu0.012, Y0.02 phosphor powders were investigated. The phosphor powders obtained from the spray solution with the NH4Cl flux had higher photoluminescence intensities compared to phosphor powders obtained from the spray solution without the flux. The photoluminescence intensity of the phosphor powders obtained from the spray solution without the flux decreased as the flow rate of the fuel gas increased. On the other hand, the photoluminescence intensity of the phosphor powders obtained from the spray solution with the flux increased as the flow rate of the fuel gas increased. The difference of in the phase purity and morphology of the powders affected the photoluminescence intensities of the phosphor powders.

Pax6는 진화적으로 잘 보존된 homeobox유전자 그룹의 하나로 배 발생기 동안 시공간적으로 제한되어 발현된다. 이 실험은 말라리아 매개모기인 Anopheles stephemi에서의 Pax6 발현을 서로 다른 분자환경 조건에서 조사해 보기 위해 트랜스포존의 하나인 piggyBac과 Pax6에 결합하는 3xp3-EGFP를 사용한 생식세포 형질전환 방법을 사용하였다. 4개의 형질 전환 계열이 만들어졌고 형질전환율은 6.7%였으며, 도입 유전자는 여러 세