고주파대역을 자체 파형으로 재구성한 비균일 음성 표본화법에 관한 연구

김일환 숭실대학교 1998 국내석사

少陰人 補中益氣湯과 補中益氣탕에 대한 四象醫學的 비교 연구

김일환 원광대학교 1996 국내석사

Regularity and intra-regularity in po-semigroups

김일환 慶尙大學校 1995 국내석사

燐酸鹽이 쌀 澱粉의 리올로지에 미치는 영향

김일환 단국대학교 1984 국내박사

燐酸鹽이 멥쌀(아끼바레 및 밀양30호) 및 찹쌀 澱粉의 糊化度와 리올로지(rheology) 특성에 미치는 영향을 조사하였다. 인산염은 sodium polyphosphate 80%, sodium hexametaphosphate 7% 및 potassium polyphosphate 8%로 이루어진 縮合燐酸鹽(67%, P_(2)O_(5))을 사용하였으며, 사용농도는 전분 또는 쌀의 무게비로 0.3 %이였다. 전분의 호화에 필요한 최저 수분은 아끼바레가 43%, 밀양30호 및 찹쌀이 45%이었다. 인산염의 첨가시에는 멥쌀 전분의 호화에 필요한 수분함량은 40%로 감소되었으며, 찹쌀 전분의 경우에는 변화가 없었다. 전분의 호화에 필요한 최저온도는 멥쌀 전분의 70℃, 찹쌀 전분이 65℃이었다. 인산염은 쌀 전분의 호화도에는 큰 영향을 주지 않았으나, 동일한 가열온도에서 인산염의 첨가시 높은 값을 보였다. 그러나 찹쌀 전분의 경우 인산염의 효과는 볼 수 없었다. 멥쌀 전분 현탁액(5%)은 65℃에서, 찹쌀 전분현탁액(5%)은 60℃에서 의가소성 유체(pseudoplastic fluid) 의 거동을 보였다. 인산염의 첨가시 멥쌀 전분은 의가소성이 증가하는 현상을 보인 반면, 찹쌀 전분의 경우에는 뚜렷한 증가를 보이지 않았다. 인산염은 전분현탁액의 유동의 활성화 에너지(activation energy)값을 약 2 배 증가시켰다. 쌀 전분 호화액(5%)은 항복응력(yield stress)을 갖는 의가소성 유체(즉, 빙햄 의가소성유체)의 거동을 보였다. 인산염의 첨가시 쌀 전분 호화액의 항복응력 값은 현저히 감소하였다. 전분 호화액을 90℃에서 1시간 유지한 경우 멥쌀전분 호화액의 항복응력 값은 다소 감소하였으나, 찹쌀 전분 호화액은 10배 정도 감소하였다. 밥의 노화 시간상수(속도상수의 역수)는 아끼바레가 6.80, 밀양30호가 6.72, 찹쌀이 28.17일(日)이었다. 아끼바레 및 밀양 30호의 경우 시간상수는 인산염의 첨가시 각각 1.22 및 1.53배 증가하여 현저한 노화억제 효과를 보였으나, 찹쌀밥의 경우에는 변화가 없었다. 인산염은 아끼 바레 및 밀양30호 쌀밥의 노화속도를 각각 14.0 및 27.0% 감소시켰다. The effect of phosphate on the degree of gelatinization and rheological properties of rice starch and firming rate of cooked rice has been investigated. Nonwaxy varieties of a Japonica type(Akibare) and an Indica type (Milyang 30) and a waxy variety of rice have been dehulled and abrasively polished 8% by weight. 'Phosphate (67%P_(2)O_(5)) is composed of sodium Polyphosphate (85%), sodium hexametaphosphate (7%) and potassium polyphosphate (8%). The concentration of phosphate employed is 0.3% based on the weight of starch or rice. 1. The gelatinization of rice starch has been deteimined by X-ray diffractometry. When the decrease in peak height of component of the native starch (0% gelatinization) as the built-in internal standard is related to the original peak of this component, a linear relationship has been obtained between the decrease in crystallinity and the degree of gelatinization(R^(2)=99.80%). The minimun moisture content for the gelatinization of Akibare starch is 43%, and that for Milyang 30 and waxy starch being 45%. Phosphate has lowered the minimum moisture content for the gelatinization of nonwaxy rice starches to 40%. The minimun temperature for the gelatinization of 5% non-waxy and waxy starches are 70 and 65℃, respectively. Phosphate has exerted no effect on waxy rice starch. However, the degree of gelatinization of rice starches at the same temperature has been found higher in the presence of phosphate, except waxy rice starch. 2. Rheological properties of 5% starch suspension has been investigated using a tube viscometer. Nonwaxy and waxy rice starch suspensions at 30-60℃ and 30-55℃, respectively, has had no yield stress and showed dilatant flow behavior in the absence or presence of phosphate. However, nonwaxy starhes at 65℃ and waxy starch at 60℃ have been found to be pseudoplastic flows Flow activation energies for rice starch suspensions are 0.88-1.45 ㎉/㏖e at 30-50℃ and about 45-73 ㎉/㏖e at 60-65℃. Flow activation energy in the presence of phosphate is 90-182 ㎉/㏖e at 60-65℃. Akibare starch has the highest activation energy, and waxy starch the Lowest. 3. Rheological properties of gelatinized rice starch solutions (5%) have been examined with a Brookfield viscometer. Gelatinized rice starch solutions have showed pseudoplastic flow having yield stress, i. e., Binghamplastic flow behavior. The yield stress of gelatinized rice strarch solutions has been reduced by the phosphate. Phosphate has increased the pseudo-plasticity of gelatinized nonwaxy rice starch solutions, but decreased that of gelatinized waxy rice starch solution. The yield stress of gelatinized nonwaxy rice starch solutions held for one hour at 90℃ has been slightly decreased, but that of waxy starch solution has been reduced by 10-fold. Phosphate has reduced the yield stress for both gelatinized nonwaxy and waxy rice starch solutions. Phosphate has decreased the consistency index, but has not affected the flow behavior index of the gelatinized rice starch solutions. 4. The time constants (reciprocal rate constant) for the staling of cooked Akibare, Milyang 30 and waxy rice are 6.80, 6.72 and 28.17 days. The time constants for Akibare and Milyang 30 have increased by 1.22 and 1.53-fold, respectively, in the presence of phosphate. Phosphate has had no effect on the firming rate of cooked waxy rice. Kinetic studies indicate that the primary effect of phosphate decreasing the firming rate of cooked nonwaxy rice is to reduce the amount of starch components available for crystallization. Of the total amount of starch components available for crystallization of cooked nonwaxy rice, about 52% have been crystallized during storage of cooked rice at 2l℃ for 5 days. Phosphate has reduced the firming rate of cooked Akibare and Milyand 30 rice by 14.0 and 27.0%, respectively.

段階的 敎授-學習 방법이 英語 入門期 兒童의 會話 能力 향상에 미치는 효과

김일환 원광대학교 1997 국내석사

2차 북핵위기와 6자회담의 전개와 전망에 관한 연구

김일환 인천대학교 교육대학원 2005 국내석사

지형학적 인자에 의한 미호천수계의 계회홍수량 산정

김일환 忠北大學校 2003 국내석사

선택적 에미터를 통한 대면적 결정질 실리콘 태양전지 효율 향상에 관한 연구 세종대학교 대학원 전자공학과 김 일 환

김일환 세종대학교 대학원 전자공학과 2014 국내석사

The explosion of PV production across the globe in the past few years has shown the possibility for opening new renewable energy era, especially in solar as one of the promising energy sources. Though we are passing through the dimly lit tunnel of tough solar market, facing drop in prices and reorganization of solar market today, we can expect more bright future in the very near future for the increase in PV installation year by year and emerging new markets. One of the main objectives of today’s solar cell research and manufacturing is to reduce cost per watt peak. This can be achieved not only by reducing the production cost of the cells but also by increasing the cell efficiency with only moderate raise of the cell production cost. Cell concepts such as the HIT cell of previous Sanyo or the IBC cell of Sunpower are concepts that generally achieve very high efficiencies, but suffer from increasing production costs. Currently, the standard cell process by applying screen printed front side electrode on top of a SiNx ARC and full area rear side metal contact dominates the PV market, and besides some companies are trying to increase cell efficiency with few additional processing steps. This work focuses on the improvement of the cell efficiency by adopting laser Doping and etch paste for fabrication of selective Emitter solar cells. These two methods allow selective emitter formation with low doping regions between fingers, enhancing blue response by lowering the surface recombinations. In this paper, we have carried out optimization of laser Doping and etch paste process. Laser Doping is an alternative to conventional thermal annealing to form PN juctions in silicon solar cells. The laser processing has many advantages such as simple and low temperature process, high throughput, and low cost of ownership. For fabrication of selective low sheet resistance regions, we have used phosphosilicate glass layer as an dopant source, which was produced after furnace diffusion. Etch paste method also has advantages such as good uniformity, high efficiency compared to other methods. In this paper, I-V measurement, IQE measurment and lifetime mapping analysis have been used to investigate the elelctrical and optical properties of the several batches of selective Emitter solar cells. We have achieved the efficiency of 18.88% and 19.05% by using the laser Doping and etch paste process, respectively. Although the cell efficiency in selective Emitter solar cell fabricated by using etch paste is better than that of the cell by laser Doping, the laser Doping can be applied to conventional manufacturing systems directly because the laser Doping needs only single additional step. On the other hand, for the case of etch paste, three more additional process steps are needed to form selective Emitter when compared with the laser Doping process. By comparing two methods for fabrication of selective Emitter solar cells, we have shown the laser Doping is more useful method for applying industrial solar cell fabrication.

방사능 측정을 위한 고 분해능 저온검출기 개발 및 특성 연구

김일환 대전대학교 대학원 2010 국내석사

Cryogenic detectors, which measure the temperature change due to absorption of energy at low temperatures typically below 100 mK, have made breakthroughs in particle detections in many aspects of science. In spite of their outstanding sensitivities and versatile performances, cryogenic detection technique has not yet well established in Korea. In the present thesis, an effort of developing cryogenic detectors particularly using a metallic magnetic calorimeter (MMC) is introduced. The temperature sensor of an MMC is made of dilute concentration of paramagnetic material in a metallic host. Its magnetization is a function of temperature in an applied magnetic field. The change of magnetization resulted from absorption of energy is measured by a dc-SQUID. A small piece of Au:Er was used as the sensor material. MMC result was measured with a use of an 241Am source. The absolute radioactivity of three different 241Am was measured. The energy resolution of 10.8 keV in FWHM for 5486 keV alpha particles. The result is nearly one order of magnitude better than that of a conventional Si(Li) detector.

부산지역 자연형 하천 습지의 모기 발생소장과 미생물 살충제, Bacillus thuringiensis var. israelensis를 이용한 모기방제 효과

김일환 高神大學校 大學院 2003 국내석사

Adult mosquito collections were conducted from 2002 through 2003 near a marsh area in downtown of Busan. The marsh area consists of Oncheoncheon stream, small marshy, sewage sites and ground pools. This surveillance was performed to seasonal prevalence of mosquitoes near a marsh area in Busan, and to recommend insecticide spraying for mosquito control on this area. Adult mosquitoes were collected weekly in two Nozawa type light traps from the third week of May to the last week of September each year. Totals of 1,201 (37.5 adults/trap) and 1,065 (35.5 adults/trap) adults were collected in 2002 and 2003, respectively. Among the total 4 species comprising 3 genera, Culex. pipiens (95.5% in 2002, 97.2% in 2003), Cx. tritaeniorhychus (3.8% in 2002, 1.7% in 2003), Anopheles sinensis (0.2% in 2002, 1.0%, in 2003) and Ochlerotatus togoi (0.5% in 2002, 0.1% in 2003) were collected in the site. A mosquito larval control evaluations of industrial formulation of Bacillus thuringiensis var. israelensis (B.t.i., Bactosec^((R)), Wettable Powder) against Cx. pipiens were performed in natural four ponds near Oncheoncheon stream during the period of May through September, 2002. Also, mosquito larval control evaluations were performed in four sewage effluent waters adjacent to Oncheoncheon stream using B.t.i. briquettes against Cx pipiens. The mosquito larvae were treated with the B.t.i. briquettes at the rate of a briquette/4㎡ at three times during the four months. In pond assessment where Cx. pipiens was predominantly breeding, the treatments of B.t.i. wettable powder produced only 37.5%, 64.5%, and 72.5% reductions at the concentrations of 10-20 kg/ha in 24, 48, and 72 hours after treatments, respectively. At B.t.i. briquette assessments, the treatment made the Cx, pipiens larval reduction in total averages of 65.1%, 66.1%, 91.7%, 91.3%n, 82.4% 82.0%, and 100.0% in 1, 3, 7, 14, 21, 26, and 33 days, respectively.