Magnesium hydroxide-melamine core-shell particles were prepared through the coating of melamine monomer on the surface of magnesium hydroxide in the presence of phosphoric acid. The melamine monomer was dissolved in hot water but recrystallized on the surface of magnesium hydroxide by quenching to room temperature in the presence of phosphoric acid. The core-shell particle was applied to low-density polyethylene/ ethylene vinyl acetate (LDPE/EVA) resin by melt-compounding at 180˚C as flame retardant. The effect of magnesium hydroxide and melamine content has been studied on the flame retardancy of the core-shell particles in LDPE/EVA resin according to the preparation process and purity of magnesium hydroxide. Magnesium hydroxide prepared with sodium hydroxide rather than with ammonia solution revealed higher flame retardancy in core-shell particles with LDPE/EVA resin. At 50 wt% loading of flame retardant, core-shell particles revealed higher flame retardancy compared to that of the exclusive magnesium hydroxide in LDPE/EVA composite, and it was possible to satisfy the V0 grade in the UL-94 vertical test. The synergistic flame retardant effect of magnesium hydroxide and melamine core-shell particles was explained as being due to the endothermic decomposition of magnesium hydroxide and melamine, which was followed by the evolution of water from the magnesium hydroxide and porous char formation due to reactive nitrogen compounds, and carbon dioxide generated from melamine.

TiO2 nanowires were self-catalytically synthesized on bare Si(100) substrates using metallorganic chemical vapor deposition. The nanowire formation was critically affected by growth temperature. The TiO2 nanowires were grown at a high density on Si(100) at 510˚C, which is near the complete decomposition temperature (527˚C) of the Ti precursor (Ti(O-iPr)2(dpm)2). At 470˚C, only very thin (< 0.1μm) TiO2 film was formed because the Ti precursor was not completely decomposed. When growth temperature was increased to 550˚C and 670˚C, the nanowire formation was also significantly suppressed. A vaporsolid (V-S) growth mechanism excluding a liquid phase appeared to control the nanowire formation. The TiO2 nanowire growth seemed to be activated by carbon, which was supplied by decomposition of the Ti precursor. The TiO2 nanowire density was increased with increased growth pressure in the range of 1.2 to 10 torr. In addition, the nanowire formation was enhanced by using Au and Pt catalysts, which seem to act as catalysts for oxidation. The nanowires consisted of well-aligned ~20-30 nm size rutile and anatase nanocrystallines. This MOCVD synthesis technique is unique and efficient to self-catalytically grow TiO2 nanowires, which hold significant promise for various photocatalysis and solar cell applications.

Most TCOs such as ITO, AZO(Al-doped ZnO), FTO(F-doped SnO2) etc., which have been widely used in LCD,touch panel, solar cell, and organic LEDs etc. as transparent electrode material reveal n-type conductivity. But in order to realizetransparent circuit, transparent p-n junction, and introduction of transparent p-type materials are prerequisite. Additionalprerequisite condition is optical transparency in visible spectral region. Oxide based materials usually have a wide optical band-gap more than ~3.0eV. In this study, single-phase transparent semiconductor of SrCu2O2, which shows p-type conductivity, havebeen synthesized by 2-step solid state reaction at 950oC under N2 atmosphere, and single-phase SrCu2O2 thin films of p-typeTCOs have been deposited by RF magnetron sputtering on alkali-free glass substrate from single-phase target at 500oC, 1%H2/(Ar+H2) atmosphere. 3% H2/(Ar+H2) resulted in formation of second phases. Hall measurements confirmed the p-typenature of the fabricated SrCu2O2 thin films. The electrical conductivity, mobility of carrier and carrier density 5.27×10−2S/cm,2.2cm2/Vs, 1.53×1017/cm3 a room temperature, respectively. Transmittance and optical band-gap of the SrCu2O2 thin filmsrevealed 62% at 550nm and 3.28eV. The electrical and optical properties of the obtained SrCu2O2 thin films deposited by RFmagnetron sputtering were compared with those deposited by PLD and e-beam.

In this paper, double texturization of multi crystalline silicon solar cells was studied with laser and reactive ion etching (RIE). In the case of multi crystalline silicon wafers, chemical etching has problems in producing a uniform surface texture. Thus various etching methods such as laser and dry texturization have been studied for multi crystalline silicon wafers. In this study, laser texturization with an Nd:YVO4 green laser was performed first to get the proper hole spacing and 300μm was found to be the most proper value. Laser texturization on crystalline silicon wafers was followed by damage removal in acid solution and RIE to achieve double texturization. This study showed that double texturization on multi crystalline silicon wafers with laser firing and RIE resulted in lower reflectance, higher quantum yield and better efficiency than that process without RIE. However, RIE formed sharp structures on the silicon wafer surfaces, which resulted in 0.8% decrease of fill factor at solar cell characterization. While chemical etching makes it difficult to obtain a uniform surface texture for multi crystalline silicon solar cells, the process of double texturization with laser and RIE yields a uniform surface structure, diminished reflectance, and improved efficiency. This finding lays the foundation for the study of low-cost, high efficiency multi crystalline silicon solar cells.

목 적: 본 연구는 고함수 하이드로젤 렌즈를 제조하기 위해 일반적으로 사용되는 콘택트렌즈의 재료와 MPTS(methacryloxypropyl tris(trimethylsiloxy)silane) 및 DMA(N,N-dimethylacrylamide)를 각각 첨가하여 중합한 후 이 재료들의 첨가 비율을 증가시켜 물리적 특성을 평가하였다. 방 법: MPTS와 DMA를 교차결합제인 EGDMA와 HEMA, NVP, MMA 그리고 개시제인 AIBN을 사용하여 캐스트 몰드법으로 공중합 하였다. 결 과: 실험결과, DMA를 첨가하여 제조한 콘택트렌즈의 함수율은 43.32~64.65%, 산소전달률(Dk)은 13.55~33.55×10(-11)(cm2/sec)(mlO2/ml×mmHg)이었다. MPTS를 첨가하여 제조한 콘택트렌즈의 경우, 함수 율은 41.02~47.62%, 산소전달률(Dk)은 13.88~20.38×10-11(cm2/sec)(mlO2/ml×mmHg)이었다. DMA가 첨가된 조합에서는 함수율이 증할수록 산소전달률(Dk)이 증가하는 경향을 보였지만 MPTS가 첨가된 조합에서는 함수율이 증가하여도 산소전달률(Dk)은 일정하게 유지되는 경향을 보였다. 결 론: 본 실험결과로 볼 때 생성된 공중합체는 고함수율을 가진 안의료용 재료로 사용될 수 있을 것으로 판단된다.

본 연구에서는 국내 제조업의 기술혁신 패턴을 산업의 기술집약도에 따라 4개 부문-고기술, 중상기술, 중하기술 및 저기술-으로 나누어 살펴보았다. 과학기술정책연구원의 기술혁신조사(KIS 2008) 데이터를 이용한 실증분석 결과, 국내 기술혁신 패턴은 산업의 기술 수준이 높고 낮음에 관계없이 모든 산업부문에서 Pavitt의 과학기반형 특성을 나타내는 것으로 확인되었다. 이러한 결과는 고기술산업과 저기술산업의 기술혁신 패턴이 각각 Pavitt의 과학기반형(science-based)과 공급자주도형(supplier-dominated)으로 뚜렷하게 구분되는 해외 연구결과와는 차이를 나타낸다. 이는 국내 기술혁신활동이 해당 산업의 기술수준이나 특성을 제대로 반영하지 못한 채 고기술산업을 기준으로 획일화되어 있음을 보여주는 것이다. 향후 각 산업의 기술수준이나 특성을 반영하는 효과적인 기술·혁신정책 수립을 위해서는 국내 기술혁신 패턴이 이러한 양상을 나타내는 원인과 그것이 혁신성과에 미치는 영향에 대한 추가적인 연구가 필요하다 하겠다.

Camellia sinensis L. (green tea) seed oils were prepared by roasting at 213℃ and pressing (RP), pressing (P), and nhexane extraction (H). The physico-chemical properties of the RP, P, and H samples, including fatty acid composition, color, and sensory characteristics were analyzed. RP, P and H samples were thermally oxidized at 180℃, and oxidative stability was determined by DPPH, CDA, and p-AV at 0, 20, 40, 60, and 80 min. Compared to the P and H samples, RP resulted in significantly higher thermal oxidative stability according to the DPPH, CDA, and p-AV results (p〈0.05). The ratio of unsaturated fatty acids to saturated fatty acids among RP, P, and H samples were significantly different (p〈0.05). The oleic acid and linoleic acid contents in green tea seed oils were 58 and 23%, respectively. Hunter's color value of lightness (L) for the RP, P, and H samples was not significant. Redness (a) of RP was 3.47±0.119 and yellowness (b) of H was 60.10±2.483, which were significantly different. Compared to RP samples, H and P samples had the highest color and off-odor values in the sensory evaluation. RP samples showed the highest taste value and were significant overall (p〈0.05). The thermal stability of RP extraction was more stable than any other method. Camellia sinensis L. seed oil extracted by RP had better sensory characteristics than other edible oils, including soybean oil, grape seed oil, and extra virgin olive oil.

The principal objective of this study was to determine the optimal mixing conditions for three amounts of onion powder, sugar, and butter to prepare onion powder cookies. The experimental design was based on the central composite design methodology of response surface, which included 16 experimental points including two replicates for onion powder, sugar, and butter. The mechanical and sensory properties of the cookies were measured, and these values were applied to the mathematical models. A canonical form and perturbation plot showed the influence of each ingredient on the mixed final product. The results of the spread ratio did not show significant results, but hardness increased with increasing quantities of onion powder and sugar but decreased with butter (p<0.01). The color lightness "L" value increased with increasing quantities of sugar and butter but decreased with added onion powder. In contrast, the redness color "a" value increased with increasing quantities of onion powder and sugar. Sugar did not affect the yellowness color "b" value, but the color b value increased with increasing onion powder and sugar. The results of a sensory evaluation using the predicted model showed significant values for flavor (p<0.01), texture (p<0.05), taste (p<0.05), and overall quality (p<0.01). As a result, the optimum formulation by numerical and graphical methods was calculated as 12.58 g onion powder, 35 g sugar, and 52.38 g butter.

Bamboo leaf powder was added to Jeolpyun to increase the neutraceutical effects and storage period. The bamboo leaf powder was added to rice flour at ratios of 0, 4, 6, 8, and 10% (w/w), and they were treated with aqueous malt extract to extend storage. The Jeolpyun was stored at 20℃ for 72 hr, and the physical and sensory characteristics were evaluated. As a result, the crude fat, crude protein, moisture, crude ash and total dietary fiber contents in bamboo leaf powder were 4.36, 11.29, 3.37, 7.33, and 65.57%, respectively. The Hunters L, a, and b values decreased significantly as the amount of bamboo leaf powder increased; however, the a and b values increased during storage. The paste property setback values decreased with the malt extract treatment and with increasing amounts of bamboo leaf powder. In a sensory analysis, hard texture strength in the malt extract and bamboo leaf powder treatment groups was less than that in the control during storage. The Jeolpyun prepared with malt extract and no bamboo leaf powder was the most accepted by consumers. Although adding bamboo leaf powder resulted in less consumer acceptance except for the flavor attribute, adding 4% and 8% bamboo leaf powder resulted in better consumer acceptance for texture, taste, and overall acceptance than that of the control. In a microbial analysis, adding bamboo leaf powder resulted in fewer mold colonies. In conclusion, adding 4% bamboo leaf powder and malt extract to Jeolpyun improved its storage properties.

Research was conducted on vinegar types and characteristics with reference to representative literature such as SanGaYoRok, SikRyoChanYo, SooEunJabBang, GoSaChalYo, DongEuiBoGam, SaSiChanYoCho, JuBangMoon, ShinGanGuWhang, ChalYoSeo, EumSikDiMiBang, YoRok, ChiSengYoRam, SanRimKyoungJae,EumSikBo,OnJuBeop, SulManDeuNunBeop, KyuHapChongSeo, ImWonSipYukJi, JungIlDangJabJi, SulBitNeunBeop, SiUiJeonSeo, and BuInPilJi from the 15th to the 19th centuries of the Joseon Dynasty. Based on this research, a classification of materials used in vinegar, knowledge on treatment, preparation of ingredients, capturing flavor, storage of vinegar, as well as the favorable days that vinegar can be manufactured were studied and analyzed based on the different aspect of vinegar. Vinegar is a wellknown condiment throughout the world and has the potential of becoming a luxurious food. Replication and further analysis to expand the properties of vinegar is necessary using old literature, together with the literature identified above. Based on ongoing research, it is foreseeable that the development of a vinegar with unique characteristics and improved standards will be the foundation for the globalization of Korean cuisine, which is our current focus.

The objective of this study was to develop functional rice coated with yacon roots extracts and to evaluate the antioxidant properties and physiological activity of rice coated with yacon extract. The washed rice was coated by spraying yacon extract at 10, 20, 30, and 40 °Brix and dried at room temperature. The moisture contents, color changes, antioxidant properties as total polyphenolics and DPPH radical scavenging activity and instrumental texture property and sensory evaluation change in the yacon root extracts coated rice and uncoated cooked rice were observed during 3 days of storage. Increasing the coating concentration was associated with lower color values(L value) and moisture contents. Total phenolics and DPPH radical scavenging properties generally increased in the cooked rice coated with yacon root extract more than the control (non-coated rice). However, D-20(20 °Brix of the yacon root concentration) resulted in better textural properties and sensory overall acceptability in cooked rice on 0 and 3 storage days. It was concluded that the optimum coating ration of rice and added functional yacon rice were 20 °Brix and 7% respectively, in proportion to the total weight of raw rice.

We developed functional synthetic lubricant for internal combustion engine oil, which would improve engine oil performance for internal combustion engine and extend engine life. We made base oil by synthesizing nonanoic acid, 1.1.1-trimethylol propane (which has good bio-degradability) and pentaerythrytol ester. We synthesized catalyst using p-toluene sulfonic acid 0.15 wt% and coloring-prevention agent hypo-phosphorus acid 0.18 wt% at 180-190℃. Reaction temperature was increased at the rate of 10℃ for every 1 hour. When acid value reached below 3, reaction was completed. After cooling and deoxidization, we washed it by distilled water two times. After dehydration and filtering, we obtained trimethylol propane tripelargonate (TMTP) and pentaerythrytol tetrapelargonate (PETP) at yields of 96 % and 98 % respectively.

Regenerated cellulose fibers were prepared from three pulps containing different degree of polymerization(DP) and α-cellulose contents by dry-jet wet spinning technique with cellulose dope in N-methylmorpholin N-oxide (NMMO). The effect of antioxidant, n-propyl gallate (PG) on the properties of different regenerated celluloses was studied using X-ray diffraction, copper number calculation, and viscometry. The degradaqtion of regenerated cellulose from pulp containing higher DP and lower α-cellulose content was occurred more seriously. The tensile strength and initial modulus of regenerated cellulose fiber obtained from NMMO dope with PG were higher than those of fiber obtained from NMMO dope without PG. All fibers showed the round shape cross section and typical cellulose II crystalline structure.

To prepare very stable acrylic type emulsion having a visible ray absorption property, in-situ preparation technique of CuxS nanoparticle was adopted. Firstly, the acylic emulsions of methyl methacrylate(MMA), butyl acrylate(BA), and acrylonitrile(AN) were synthesized by pre-emulsion polymerization at 60℃ in the presence of anionic surfactant. Secondly, CuxS nanocomposited emulsions were directly prepared in the prepolymerized acrylic emulsion with CuSO4 at 50℃. The presnce of CuxS nanoparticle in emulsion was confirmed by SEM and EDS. The final CuxS nanocomposited emulsion showed an olive-green colour and good emulsion stability up to 1 month. In addition the PET films coated with our CuxS nanocomposited emulsion absorbed effectively the visible ray.

Dry Process(natural drying, hot-air drying, oil fry drying), optimized mixture ratio and the condition of carbonization was carried out in order to improve the product durability develop eco-friendly solid fuel mixing food waste and paper sludge. As a result of the experiment, oil fry drying process was the fastest method for drying food waste and paper sludge mixture that contains 80% water inside, and the optimized mixture ratio to minimize the generating concentration of chlorine gas against caloric value of mixture ratio was 7:3. Additionally proper temperature of product carbonization was about 200℃ and shown increasing product durability through the carbonization. Therefore, the pelletized solid fuel be shaped diameter around 0.5cm, length 2cm under which was pulverized and molded using 7:3 mixture of food waste, and paper sludge was the eco-friendly solid fuel possible to be industrialized which is consist of chlorine concentration of below 2.0wt% and the lowest caloric value of over 5,000kcal/kg. In conclusion, this developing manufacturing process of the solid fuel can be interpreted to contribute alternative energy development in accordance with low carbon and green growth era.

Soybean lecithin liposomes composed phosphatidyl choline, phosphatidyl ethanolamine, phosphatidyl inositol and phosphatidic acid were prepared by using the previously developed supercritical reverse phase evaporation method. The effect of phospholipid composition on the formation of liposomes and physicochemical properties were examined by means of trapping efficiency measurements, transmission electron microscopy, dynamic light scattering and zeta potential measurements. The trapping efficiency of liposomes for D-(+)-glucose made of CNA-Ⅰ which contains approximately 95% phosphatidyl choline is higher than that of CNA-II and CNA-O which contain approximately 32% phosphatidyl choline. However there is no any difference between the trapping efficiency of liposomes for D-(+)-glucose made of CNA-II which has saturated hydrocarbons tails and that of liposomes made of CNA-O which has unsaturated hydrocarbon chains. The electron micrographs of liposomes made of CNA-II and CNA-O show small spherical liposomes with diameter of 0.1~0.25μm, while that of CNA-I shows large unilamellar liposomes with diameter of 0.2~1.2μm. These results clearly show that phospholipid structure of phosphatidylcholine allows an efficient preparation of large unilamellar liposomes and a high trapping efficiency for water soluble substances. Liposomes made of CNA-II and CNA-O remained well-dispersed for at least 14 days, while liposome suspension made of CNA-I separated in two phase at 14 days due to aggregation and fusion of liposomes. The dispersibility of liposomes made of CNA-I is lower than that of CNA-II and CNA-O due to the smallar zeta potential of CNA-I.

본 연구에서는 음이온교환막 개발에 관한 것으로 poly(ethylenimine) (PEI) / poly(vinyl alcohol) (PVA)의 혼합비율에 따라 막을 제조하였다. 제조된 막의 특성화를 평가하기 위하여 함수율, 접촉각, FT-IR, 이온교환용량, 이온전도도, 열 중량분석, 탄성계수 측정을 실시하였다. 이온전도도 측정 결과 PVA/PEI의 함량이 90 : 10으로 제조된 막의 경우 5.16 × 10 -2 S/cm의 값을 나타내어 우수한 음이온전도도를 나타내었으며 접촉각 측정 결과 PEI의 함량이 증가함에 따라 막표면의 소수성이 78.3℃까지 함께 증가하는 결과를 나타내었다. 또한 열에 대한 안정성은 PVA의 우수한 성질을 변화시키지 않았으며 탄성계수 측정을 통해 고강도 기계적 물성을 확인할 수 있었다.

화학적 안정성이 양호하고, 제막조건이 온화한 재료인 poly(vinylidene fluoride) (PVDF)를 주재료로 사용하여 용매, 첨가제, 혼합고분자 및 제막조건의 변화에 따른 고강도 친수성 정밀여파(microfiltration, MF) 중공사 분리막의 실험에 의해 고찰하였다. 제조된 MF 중공사막의 막성능은 평균 공경 0.3 μm, 인장강도 42kgf/㎠, 순수 투과유량은 600 LMH을 얻었다. 제막과정에서 다양한 첨가제의 막성능을 검토한 결과는 순수투과유량과 제거율에 상당한 영향을 미치고 있음을 알 수 있었다. MF막의 친수성을 개선하기 위해 소수성 PVDF와 상호 용해성 이 좋은 친수성 poly(methyl methacrylate) (PMMA)를 혼합하여 투과성능과 제거율을 개선한 우수한 친수성 MF막을 제조할 수 있었다.

본 연구에서는 셀룰로오스 트리아세테이트(CTA)를 사용한 loose RO 중공사 막이 상전환 법으로 제조되었고 이들의 수처리 특성이 평가되었다. 1,4-dioxane과 리튬클로라이드(LiCl)는 각각 스킨층 형성제와 기공 형성제로 사용되었다. 제조된 CTA 중공사막의 특성을 알아보기 위하여 전자주사현미경을 통하여 모폴로지를 관찰하였고, 수투과도 및 염 제거율, 내염소성 테스트, 그리고 분획분자량을 측정하였다. CTA/NMP/1,4-dioxane = 18/72/10 (wt%) 에어갭 30 cm의 중공사 분리막의 경우 20.5 L/m2hr의 수투과도와 60%의 염 제거율, NaOCl 10,000 ppm/hr의 내염소성 및 약 5,000 Da값의 MWCO를 나타내는 우수한 특성의 loose RO 막이 제조되었다.

폴리올레핀 중합공정에서 발생되는 미반응 올레핀 모노머를 회수하기 위한 분리막/냉각응축 공정에 적용할 복합막을 용액 코팅공정과 플라즈마 중합공정의 두가지 방법으로 제조하였다. Polysulfone (PSF) 지지체 위에 poly(dimethylsiloxane) (PDMS) 용액을 코팅하였고 코팅 용액에서 prepolymer의 함량이 높을수록 올레핀 모노머의 선택도는 증가하였으나 막이 치밀하여지는 관계로 절대 투과량은 감소하는 경향을 보였다. 유기물의 복합막 투과는 용액확산 메커니즘에 의한 것으로서 임계온도가 높을수록 분리효율은 향상되고 molar volume이 증가할수록 투과도가 향상되었다. 또한 가교시간에 siloxane 계열의 물질을 plasma 종합하여 복합막을 제조하였는데 PSF 및 polypropylene (PP) 지지체를 사용하였다. 특히 지지체로 기존의 용액코팅 공정에서 사용되기 어렵던 PP 지지체 위에도 복합막을 코팅할 수 있었으며 용액코팅 공정으로 제조된 복합막과 유사한 성능을 나타내었다.