• Journal of the Korean Society of Food Science and Nutrition
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• v.15 no.3
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• pp.243-248
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• 1986

This study was examined the contents of calcium, phosphorus, magnesium, sodium, potassium, total nitrogen (total N) and free amino acid in shank bone stock as results of boiling for eight, twelve, sixteen and twenty hours. The results were as follows. 1) Contents of calium, sodium and potassium were increased according to boiling time, Content of calcium was more than two times after boiling for twenty hours as compared with eight hours. The contents of potassium and sodium were increased slightly but that of magnesium was constant in the course of boiling. The content of phosphorus was showed maximum value after toiling for eight hours and was decreased after boiling for twelve hours. 2) The content of total N was increased according to boiling time and showed moximum value after boiling for twenty hours. Total N was extracted more than two times after boiling for twenty hours as compared with eight hours. The content of free amino acid was little at various boiling time. The contents of glycine, glutamic acid and serine were increased according to boiling time. Glycine was the most abundant free amino acid and was followed in order of glutamic acid. alanine and serine.

• Journal of the Korea institute for structural maintenance and inspection
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• v.13 no.3 s.55
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• pp.127-134
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• 2009

This study investigated their properties of spalling resistance and residual compressive strength after fire test corresponding to various ISO, RABT heating curves, and contents of hybrid organic fiber of high strength concrete. The results were summarized as following. As fundamental characters of concrete with hybrid organic fiber, the flowability was directly declined as the increase of fiber contents, and air contents were decreased or increased a little bit, but there was not big difference. The compressive strength was gradually declined sluggishly at 28 days. As properties of fire resistance, in case of RABT heating curves, compare with ISO heating curves a spalling aspect showed till range that has much contents of hybrid organic fiber, but they are mostly peeling spalling, which means spalling aspect didn't happen to inside. In conclusion, in case of W/B 25% high strength concrete, the spalling was prevented over 0.04% of contents of fiber at ISO heating curve and over 0.10% of contents of fiber at the RABT heating curve. In case of spalling was prevented, mass reduction rate according to the change of heating temperature curves showed around 7% at ISO heating curves and around 9% at RABT heating curves. The residual compressive strength rate corresponding to the change of heating temperature curves showed 50%~60% at ISO heating temperature curves and 30%~35% at RABT heating temperature curves in case of spalling was prevented.

• Journal of the Society of Naval Architects of Korea
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• v.35 no.2
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• pp.104-113
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• 1998

The line heating method is a popular technique used to form ship hull in shipyards. In order to promote shipbuilding productivity, some researchers have made progress in their studies on automatic fabrication system for plate forming. These researches have, however, focused on heat-induced plate deformation with particular mechanical modelings, and do not yet propose the heating paths applicable to actual plate forming process. In this paper, a new algorithm to determine heating lines is developed to simulate the line heating process. The important feature of this algorithm is that it calculates principal curvatures of deflection difference surface which represents difference between target surface and surface in fabrication. Several trials to typical surface types show its usefulness and good applicability to tactical use.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.156-158
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• 2019

낮은 저항 용기를 가열할 수 있는 유도 가열 장치는 유도가열 장치용 하프 브릿지 직렬 공진형 인버터의 높은 입력 전압과 높은 턴 수의 코일을 통해 낮은 저항의 용기를 가열한다. 그러나 자성체 용기는 높은 턴 수의 코일에서 높은 저항 값을 가지므로 적절한 전력을 내기 위해서는 높은 입력 전압이 필요하다. 이러한 경우 부스트 토폴로지의 역률 개선 회로를 사용할 수 있다. 하지만 입력 전압의 변동에 따라 직렬 공진형 인버터의 출력 전력 제어를 위한 동작 점 변동이 필요하므로 인버터의 손실이 변동한다. 본 논문에서는 낮은 저항 용기를 가열하기 위하여 높은 턴 수의 코일을 탑재한 유도 가열 장치용 하프 브릿지 직렬 공진형 인버터에서 자성체 용기의 가열 시 입력 전압 변동에 따른 인버터의 손실 분석을 통해 최적의 입력전압 조건을 선정하고자 한다. 제안하는 입력전압 선정 기법은 2-kW 급 유도 장치용 하프 브릿지 직렬 공진형 인버터 시 제품을 통해 타당성을 검증한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4381-4387
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• 2015

Ship hull is a compound curved shape and most of shipyards have been using gas heating method for the surface forming of steel plate. This traditional forming process have problems such as difficulties in heat input control and poor working conditions due to loud noise and air contamination. Recently, researches on automatic hull forming system have been conducted using high frequency induction heating method which have good control ability and favorable working environment. In this study, the induction heating simulation system for curved surface forming of steel plate was developed and induction heating experiments were performed. Based on the results of this study, efficient induction heating coil design and optimal heating conditions for the automatic hull forming system can be obtained.

• Korean journal of food and cookery science
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• v.11 no.1
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• pp.20-25
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• 1995

The effects of cooking on the dietary fiber content in rice, brown rice, yellow soybean and black soybean were investigated. The dietary fiber contents were analyzed by Prosky's method(AOAC method) after boiling, microwave heating and autoclaving of the sample. It was showed that the different cooking methods resulted in different effects on the insoluble dietary fiber contents. Except yellow soybean, cooking time had little effect on insoluble dietary fiber contets in the other samples. The contents of soluble dietary fiber were generally increased by cooking. Increased cooking time reduced the content of soluble dietary fiber in brown rice but increased in rice. However, no significant differences caused by cooking time were observed for soluble dietary fiber in black soybean. The effects of cooking method on the total dietary fiber contents were similar to those of insoluble dietary fiber. The reasons for this might be that the main fraction of total dietary fiber was insoluble forms and the content of total dietary fiber was calculated as the sum of insoluble and soluble dietary fiber content.

• Journal of the Society of Naval Architects of Korea
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• v.39 no.2
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• pp.69-80
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• 2002

Sequential process of roll-bending and line heating has been used to deform the curved hull-plates in shipyards. A growing interest for the mechanization or automation of the line heating process has been noted. Relations between heating conditions and residual deformations are important components needed for the mechanization. The residual deformations are investigated by using a thermal elastic-plastic analysis based on the finite element analysis(FEA). Several experiments are also performed to examine the validity of the results of FEA. The input parameters of line heating are suggested by dimensional analysis of line heating. The dimensional analysis can extract the primary input-parameters of line heating. The relations between the heating conditions and the residual deformations are set up by multi-variate analysis and multiple-regression method. This study suggests a method for the relation between the heating conditions and the deformations lying under the line heating.

• Journal of the Korean earth science society
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• v.30 no.1
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• pp.58-68
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• 2009

Three-dimensional distributions of longwave radiation flux for the April-September 1998 period are generated from radiative transfer calculations using the GEWEX Asian Monsoon Experiment (GAME) reanalysis temperature and humidity profiles and International Satellite Cloud Climatology Project (ISCCP) cloudiness as inputs to understand the effect of cloud radiative forcing in the monsoon season. By subtracting the heating of the clear atmosphere from the cloudy radiative heating, cloud-induced atmospheric radiative heating has been obtained. Emphasis is placed on the impact of horizontal gradients of the cloud-generated radiative heating on the Asian monsoon. Cloud-induced heating exhibits its maximum heating areas within the Indian Ocean and minimum heating over the Tibetan Plateau, which establishes the north-south oriented differential heating gradient. Considering that the differential heating is a ultimate source generating the atmospheric circulation, the cloud-induced heating gradient established between the Indian Ocean and the Plateau can enhance the strength of the north-south Hadley-type monsoon circulation. Cooling at cloud top and warming at cloud bottom, which are the vertical distributions of cloud-induced heating, can exert on the monsoon circulation by altering the atmospheric stability.

• International Journal of Highway Engineering
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• v.4 no.1 s.11
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• pp.135-147
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• 2002

Application of the foamed asphalt techniques in recycling the waste asphalt shows that large quantify of waste asphalt(60$\sim$70% of the total mix) can be used comparing with hot mix asphalt techniques and also is environmentally safe. However, the constant quality of the recycling foamed asphalt mixtures is not readily achieved and can not be applied to the heavy traffic road due to the characteristics of the conventional foamed asphalt mixtures. The semi-hot technique that the RAP and the aggregate is heated below $100^{\circ}C$ is adopted in this study and expected to solve the problems of conventional foamed asphalt mixtures. This study presents the viability of the semi-hot foamed asphalt mixtures when using the RAP. The semi-hot recycling foamed mixtures are tested and evaluated in the laboratory. The test results including coating rates, creep tests, resilient modulus tests, indirect tensile tests and the Marshall stability tests showed significant improvement.

• Korean Journal of Food Science and Technology
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• v.40 no.6
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• pp.611-620
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• 2008

The principal objective of this study was to assess the effects of phosphatidylcholine (PC) and phosphatidylethanolamine (PE) extracted from egg yolk on the oxidation of tocopherol-stripped canola oil and its browning, as well as their content changes during 12 hr of heating at $180^{\circ}C$. PC and/ or PE contents in the oil were measured at 200, 500, 1,000, or 2,000 ppm. PL contents in the oil and oil browning were determined by high performance liquid chromatography (HPLC) and spectrophotometry, respectively. The oil oxidation was evaluated by the combination of fatty acid composition, conjugated dienoic acid content, and p-anisidine value. PC was degraded at a slower rate than PE during heating and the co-presence of PE reduced its rate of degradation. PE increased oil browning more profoundly than PC did. PC significantly reduced oil oxidation during heating; however, we noted a possible antagonism between PE and PC in reducing the oil oxidation. Egg yolk PC was a better antioxidant in oil oxidation during heating.