• Korean Journal of Soil Science and Fertilizer
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• v.23 no.3
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• pp.193-198
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• 1990

In order to develop the slow-release compound fertilizer fur upland crops, trial products were made with ammonium sulfate, diammonium phosphate, and potassium chloride with filler of calcium sulfate, and hinder of additional material of urea resin Nine trial slow-release compound fertilizers were manufactured by varying urea/formaldehyde mole ratios(U/F mole ratio : 0.5, 1.0, and 1.5 ) and the proportions of urea resin (3.3. 6.7. and 10%) and the proportions of urea resin (3.3. 6.7 and 10%). The aimed percentage of $N-P_2O_5-K_2O$ in the trial product was 12.5-10.0-14.0%, which was appropriate for Chinese cabbage. The N dissolution of the trial products in water was slower with lower U/F ratio and in creased to the proportion of urea resin. The dissolved nitrogen in water after 24hrs ranged from 69 to 83 percent of total nitrogen in the trial products.

• Korean Journal of Food Science and Technology
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• v.54 no.3
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• pp.334-342
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• 2022

To meet the needs of Muslim consumers, sausages were prepared using Halal-certified chicken thighs and different amounts of biji powder (0, 20, 30, 40, and 50%), and then the properties of the sausages were compared. As the biji powder levels increased, both the moisture content and the pH of the sausages significantly decreased, whereas their fiber content increased. As the biji powder levels increased, the free radical scavenging effect (DPPH, ABTS) and water holding capacity also increased, and the textural properties also improved. When Muslim consumers evaluated the sensory attributes of the sausages prepared in this experiment and those currently on the market, the ones prepared in this experiment were preferred over the market products. Based on the above results, chicken sausage for Muslim consumers could be successfully produced, and their overall quality and antioxidant effects could be improved by the addition of biji powder (up to 30%).

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.11
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• pp.151-159
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• 2016

This paper proposes a ceramic heating element-based tankless instant electric water heater for hand/face washing that does not require a lot of hot water. The heating module, which heats the input water and outputs hot water, operates the ceramic heating element detecting input water using a flow sensor. Inside of the heating module is designed to form one flow path in order to get almost $15^{\circ}C$ increased heated water compared to the input water temperature within 2 second after 1.5 liter per minute water supply. The design validity is verified using a heat flow analysis of the water flow and temperature variations inside of the heating module also. Based on the design data, the heating module is constructed including a single rod-type ceramic heating element. After that, a prototype system having temperature setting function by three steps were constructed. The prototype system is connected to a 1.5 liter per minute water supply line, and the water output temperature and time measurement experiments confirmed that the proposed system output the heated water increased by $18.3^{\circ}C$ in case of third step setting within 2 second after water supply. And standby power is under 1 W and peak power does not exceed the permissible range for the general house usage. Several performance results verify that the proposed tankless instant electric water heater is applicable for the washstand of the house, highway rest area and factory so on as winter-time hand/face washing.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.2
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• pp.77-85
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• 2010

Recently, As increasing cleanroom size, Stocker system is trending the large size and long distance for LCD material transfer system In order to rise a rate of production, the manufacturer are on the decrease of total tact time with Stocker system And the manufacturer are requested to high speed of next generation Stocker system Also manufacturers for the high oil prices through energy-saving conservation to minimize plant operating costs are required. Therefore, this paper propose optimal design of high efficiency Contactless Power Supply(CPS) system about high speed and energy savings of next generation Stocker system This paper proposes CPS system is applied in the long distance and straight section with Stocker system for energy savings. The test results of input!output characteristic and efficiency of CPS system on operating pattern of Stocker system were analyzed, and proved the applicability on commercial use.

• Journal of the Korea Convergence Society
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• v.5 no.4
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• pp.15-20
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• 2014

This paper discusses the creative capstone design education in Kongju National University and introduce a new operational capstone design education method. The result products are evaluated by self-evaluation and performance assessment that is based on the operational method and procedure of the project. The capstone design teams are comprised of 2~3 students with a individual major accomplishments. All teams are satisfied the criteria of evaluation. And their's self-satisfaction and questionaries are totally 3.88~4.44 point out of 5. Compared with the conduct of previous capstone design project that was not the industry affiliate, it provides students with industrial experience in design and development of industrial solution. And industrial partner must provide funds for student team to design, fabrication and test in next time.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.157-157
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• 2015

전기화학 성능이 우수하고 고내구성 고속 구리 전해도금용 DSE를 개발하기 위해 전기화학적 특성이 좋은 백금족 산화물의 조성비, 전처리 등의 공정으로 전극을 제조한 후, 고 전류밀도 조건에서 구리 전해도금을 실시하여 유기첨가제 소모율을 측정하여 최적의 전극제조 공정 조건을 확보하였다. 최적조건의 전극과 시제품 전극들을 비교분석한 결과, 상용 DSE와 비슷하거나 상회하는 내구수명을 가지는 것을 확인하였다.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.369-370
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• 2012

본 논문은 380V DC 배전 시스템의 양방향 전력 흐름 제어와 전력 변환 효율 개선을 위한 고효율 절연형 양방향 AC-DC 컨버터를 제안한다. 제안하는 회로는 비절연형 양방향 AC-DC 정류기와 절연형 양방향 CLLC 공진형 컨버터로 구성된다. AC-DC 정류기의 전력 변환 효율 높이기 위해서 단극성 SPWM 방식을 이용하여 SiC 다이오드와 Anti-parallel 다이오드가 없는 IGBT와 MOSFET를 이용하여 전력 변환 효율을 증가 시켰다. 절연형 양방향 DC-DC 컨버터의 효율을 높이기 위해서 전 범위 ZVS 동작이 가능한 양방향 CLLC 공진형 컨버터를 이용하였다. 5kW 시제품을 통하여 제안하는 절연형 양방향 AC-DC 컨버터의 성능을 검증하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.107-108
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• 2021

농업용 전기차는 일반 전기차에 비해 경량성 및 연료의 효율성이 매우 중요하다. 또한, 충돌에 대비한 재질의 강도적인 측면에서 다소 자유로움을 가진다. 본 연구에서는 레이저 가공, 절곡, 도장 등의 복잡한 절차를 통한 가공 공정을 대체하여 생산의 효율성을 극대화 할 수 있는 진공성형을 위한 전기차 전면부 3차원 설계 방법을 제안한다. 보닛 및 휀더의 3차원 설계 및 진공성형 금형 기술 개발을 통하여 제품의 안정성과 생산성 및 편의성을 향상시키는 것이 연구의 주요 목적이다. 주요 연구 절차는 CATIA를 이용한 설계 결과물을 바탕으로 ABAQUS를 이용한 구조해석을 통해 안정성을 확인하고 3D Scanner를 이용하여 시제품의 치수 확인을 통한 실효성을 검증한다. 본 연구의 결과물은 농업용 전기차 주 고객층인 고령자 및 여성 농업 종사자들에게 널리 사용될 수 있을 것으로 사료된다.

• Journal of Life Science
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• v.17 no.11
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• pp.1562-1570
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• 2007

This experiment was conducted to develop fertilizer which promotes plant growth as well as suppressing pathogenic fungi. The fertilizer was made from the mixture of Ju-Back (Korean rice wine cake) and indigenous rhizosphere-bacterium. The main ingredients of Ju-Back were investigated as 6.04% total nitrogen, 42.59% total carbohydrate, 1.01% available phosphate, 73.42% organic matter, 7.72% potassium oxide, 1.35% calcium oxide, 0.53% magnesium oxide. The enzyme activities of Ju-Back were estimated to be 980 units/g for ${\alpha}-amylase$, 300 units/g for glucoamylase, and 1800 units/g for acid pretense. Indigenous rhizosphere bacteria which produced antifungal agent were isolated from soil, and was selected KMU-13 strain which can antagonize against various plant pathogenic fungi (Botrytis cinerea KACC 40573, Sclerotinia sclerotiorum KACC 41065, Fusairum oxysporum KACC 40052, Pythium aphanidermatum KACC 40156, Phytophthora capsici KACC 40476 and Glomerella cingulata KACC 40299). KMU-13 strain was identified as Bacillus subtilis KMU-13 by biochemical and 16s rDNA analysis. The organic fertilizer was made as prototype which was composed 20% Ju-Back, 70% carrier, 9.7% microorganism cultivated solution, 0.3% trace-element. We also investigated an application of fertilizer using Ju-Back for cultivating lettuce (Lactuca sativar) which were grown in three soil conditions that had chemical fertilizer, barnyard manure, lime power, urea, potassium chloride and superphosphate as a control, the whole quantity (80 kg/10a) of posted fertilizer with the control and the half quantity (40 kg/10a) with the control. The growth characteristics were examined and analysed with several weeks interval from 3 weeks to 8 weeks on head length (cm), head width (cm/head), number of leaf and fresh weight (g/plant). The results are summarized as follows. The head width and fresh weight of lettuce were the highest at posted fertilizer 1 (whole quantity) was applied chemical, organic matter (Ju-Back) and carrier. The head length was the highest at posted fertilizer 2 (whole quantity) was applied Ju-Back only.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.48-48
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• 2010

산화물 반도체를 이용한 TFT는 비교적 우수한 특성과 더불어 간단한 구조와 공정으로 양산성 확보에 유리한 측면 때문에 많은 주목을 받고 있다. TFT-LCD의 경우에는 기존에 사용되고 있는 a-Si;H TFT에 비하여 10배이상 우수한 이동도를 가진 산화물 TFT를 이용하여 고속동작 패널을 구현할 수 있을 것으로 보이며, AMOLED의 경우에는 poly-Si TFT에 비하여 대면적 공정에서 유리한 측면이 있을 수 있다. 이러한 산화물 반도체 TFT를 상용 디스플레이 패널에 적용하기 위해서는 소자 안정성을 좀더 확보해야 하는 숙제가 남아있다. 한편, 산화물 반도체 TFT는 가시광선 영역에서 투명한 특성이 가지고 있기 때문에 이를 이용하여 투명 디스플레이(투명 AMOLED)를 개발하는 경우 투과도를 크게 증가시킬 수 있는 장점을 가지고 있다. 기존의 투명 디스플레이는 주로 투사방법을 이용하여 구현되었지만, 최근 AMOLED를 이용한 투명 디스플레이 시제품이 시연되고 있다. 투명한 AMOLED를 구성하기 위해서는 OLED뿐만 아니라 백플레인에서의 투과도 증대를 위하여 해결해야할 여러 가지 문제가 발생하게 된다. 본 발표에서는 산화물 TFT에서의 최근 이슈에 대해 살펴보고, 투명 디스플레이에의 적용에 있어서 해결해야 할 문제점에 대해서도 살펴보고자 한다.