• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.331-331
• /
• 2022

수자원에서의 증발산량은 물의 손실에 해당하고 이는 국가의 수자원 계획 및 개발 등에 기본자료로 이용, 물 순환 과정의 규명, 물 수지 분석, 작물의 소비수량 산정 등 여러 분야에 활용되고 있다. 국내외적으로 이러한 증발산량을 측정하기 위해서 큰 노력을 수행하고 있으며, 측정기기의 고도화 발전으로 인해 에디공분산 방법을 활용한 증발산량 조사가 주목을 받고 있다. 국내에서도 수자원의 조사·계획 및 관리에 관한 법률 제9조(수문조사의 실시)에 따라 측정범위가 확대되고 있음에도 적절한 관측소 설치에 관한 연구가 부족한 실정이다. 본 연구에서는 적절한 증발산량 관측망을 설계하는 절차에 관해 연구를 진행하였으며, 기기적 측면과 환경적 측면으로 나누어 분석을 시행하였다. 우선 기기적 측면에서는 에디공분산 방법의 가정사항에 적합한 위치를 선정해야 하며 이는 충분한 풍속 및 난류 발생에 용이한 지점, 관측소가 설치 가능한 위치, 관측소 유지관리를 위한 접근성 및 안정성, 원거리 자료취득을 위한 통신망 등이 고려되어야 한다. 환경적 측면에서는 증발과 증산으로 나누어 고려할 수 있는데 증발은 지면의 특성을 고려한 대상 유역의 경사, 지형, 토성, 토양수분을 분류하였으며, 증산은 대상 유역의 식생, 피복, LAI(leaf area index)를 고려하였다. 결과적으로 관측망 선정을 위하여 기기적 측면, 환경적 측면을 고려하여 분석인자를 산정하였고 증발산량 관측소의 설치지점 선정기준을 마련하였으며 관측망 설계에 대한 정량적인 평가를 위한 기준을 제시하였다.

• Journal of the Korean Geotechnical Society
• /
• v.19 no.5
• /
• pp.189-197
• /
• 2003

The treatment and hauling of surplus soils which occur from construction activity are costly and have been demanding a reasonable recycling method. This study presents laboratory test results regarding the mechanistic properties of asphalt stabilized soils. The foamed asphalt equipment which generates the asphalt bubble was used to mix the soil. The marshall stability, indirect tensile test, resilient modulus, creep test and triaxial test(UU) were conducted to find out the performance of the asphalt stabilized soil. The test results were compared with the samples that fabricated in different conditions(the samples without asphalt and the reinforced samples using 2% cement). The inclusion of the asphalt in the soil has improved the marshall stability, resilient modulus and moisture susceptibility, and the addition of the 2% cement has even more increased these properties. The amount of the fines and the optimum moisture contents for mixing affects the mechanistic properties and important parameters for mix design.

• Applied Chemistry for Engineering
• /
• v.31 no.1
• /
• pp.36-42
• /
• 2020

In order to investigate the effect of the oxidation process on thermal properties of the pitch, the oxidized pitch was prepared by changing the oxidation temperature. Thermal properties of the pitch were analyzed using thermogravimetric analysis (TGA), and it divided into three sections as A (25~100 ℃), B (250~550 ℃) and C (550~800 ℃) by derivative thermogravimetry (DTG) graph behavior. In the A section, the was reduced because the moisture contained in the pitch was removed. In the B section, as the oxidation temperature increased, the thermal stability of the pitch is improved. Because the degree of aromaticity and molecular weight of the pitch increased with increasing oxidation temperature. In contrast, the results of the C section were shown opposite of B section. Because the introduced C-OH, C-O-C, and C=O bonds were decomposed, and the resulting oxygen compounds induced the combustion reaction of the pitch.

• Applied Chemistry for Engineering
• /
• v.8 no.5
• /
• pp.715-721
• /
• 1997

W/O/W multiple emulsions were prepared comprising $MgSO_4$ in the inner aqueous phase as a model drug. The stability and drug release behavior of the multiple emulsions were studied using optical microscopy, viscometry and conductometry. Glucose was introduced in the outer aqueous phase to reduce the osmotic pressure gradient across the oil layer arising from the localization of drug molecules in the inner water phase. It was found that the presence of glucose was effective in stabilization of the multiple emulsions and in control of the release rate of drug more evidently when oil phase was partially hydrophilized with cetostearyl alcohol. This may be attributed to the fact that the migration of water accompanying the hydrophilic surfactant to the inner water phase was limited under a reduced osmotic pressure gradient and thereby slow down the destabilization of the oil/inner water interface.

• Journal of Energy Engineering
• /
• v.23 no.2
• /
• pp.1-6
• /
• 2014

Upgrading technology has been studied for efficient utilization of low rank coal. Spray coating of heavy oil was applied on the upgrading process in order to stabilize low rank coal against spontaneous combustion. Low rank coal, which contains more than 30wt% of moisture, was upgraded to high calorific coal and stabilized by spray coating of heavy oil. It was identified that spray coating of heavy oil after drying coal is the optimum procedure of upgrading low rank coal. The experimental results show that more than 2wt% of heavy oil should be adsorbed on the coal in order to stabilize sufficiently for spontaneous combustion.

• Korean Journal of Soil Science and Fertilizer
• /
• v.44 no.2
• /
• pp.161-167
• /
• 2011

The soil moisture has an important effect on growth and development of highbush blueberry (HB), mainly because the root system, devoid of root hairs, is superficial. Moreover, the texture and organic matter content of Korean soil is different from the main producing counties, such as USA and Canada. To facilitate the growth and development of HB and long-term maintenance of productivity, the research related to soil moisture condition in Korea should be the priority. This study was performed to investigate the growth properties of the HB in various soil moisture conditions in order to determine the irrigation trigger point and optimum soil water potential. The texture of soil used in this experiment was loam. For the experiments, the soil was mixed with peatmoss at a rates 30% (v/v). Irrigation was scheduled at -3, -4, -5, -8, -15 and -22 kPa soil water potential then investigated leaf macronutrient, bush growth, and fruit properties. The leaf K content of HB showed the same trend in the soil water potential, but Leaf P and Mg content was highest in -5 and -22 kPa, respectively. The productivity and growth amount of HB showed the peak at the range of -4~-8 kPa as normal distribution pattern, and greatly decreased at above -15 kPa. Total dry weight and Cane diameter were highest at -4 kPa, plant width, fruit weight and yield were highest at -5 kPa, and plant height, cane number and shoot tension were highest at -8 kPa. Soluble solids content showed same trend in the soil water potential, but titratable acidity, anthocyanins and total polyphenols were not significantly different. Therefore, the optimal soil water potential for the development and a maximum production of HB were a range of -4~-8 kPa, and the recommended ideal irrigation trigger point was within -15 kPa.

• Korean Journal of Environment and Ecology
• /
• v.14 no.2
• /
• pp.111-118
• /
• 2000

본연구는 울릉도의 성인봉과 태하령 지역의 산림 식생을 대상으로 199년 7-8월에 식생조사와 토양조사에 의한 너도밤나무 군락의 임분구조 및 DCCA ordination을 이용하여 분석한 결과는 다음과 같다. 1. 울릉도 산림의 중요치를 각 군락별로 살펴보면 너도밤나무-섬조릿대 군락에서 중요치가 높은 종은 너도밤나무, 우산고로쇠, 마가목, 섬단풍, 섬벚나무 등의 순으로 너도 밤나무-일색고사리 군락은 우산고로쇠 너도밤나무, 마가목 층층나무, 등수국 등의 순으로 나타났다 그리고 너도밤나무-큰두루미꽃 군락에서 중요치가 높은 종은 너도밤나무 우산고로쇠 등수국 마가목 음나무등의 순으로 솔송나무-섬잣나무 군락은 섬잣나무, 너도밤나무, 솔송나무, 회솔나무, 섬피나무 등의 순으로 나타났다. 2. DCCA ordination에 의하면 산림군락과 환경요인과의 상관관계는 다음과 같다 너도밤나무-섬조릿대 군락은 해발고가 높고 네 군락 중 토양수분이나 전절소 유기물 등이 많은 지역에 분포하고 있었다. 너도밤나무-일색고사리 군락은 해발고가 다른 군집보다 높고 토양수분이나 전질소, 유기물 등이 많아 너도밤나무-섬조릿대 군락과 매우 유사한 입지환경을 가진 지역이나 토성 중 clay 가 많이 함유된 지역에 분포하고 있었다. 너도밤나무-큰두루미꽃 군락은 해발고가 네 군락 중 중간지역에 분포하고 있으며 토양수분이나 유기물, 전질소 등도 중간인 지역에 분포하고 있었다. 솔송나무-섬잣나무 군락은 해발고가 낮고 토양수분이나 전질소, 유기물이 적고 sand가 많이 함유된 토양에 분포하고 있었다. 3. 울릉도 산림군락으 Shannon의 종다양도 지수는 0.5455~0.8801으로 비교적 낮은 수치를 나타내고 있다. 또한 너도밤나무 군락에서 분포하고 있는 주요 종의 조서열 중요치 곡선을 보면 전체의 기울기가 완만하여 너도밤나무 군락은 안정적이라 할 수 있다.단 생산성 향상을 위한 세포의 고농도 배양에는 조사한 여러 배양 시스템 중에 가장 효율적인 시스템임올 알 수 있었다 하지만 이 시스템 에서 포도당을 낮은 level로 유지할 수 있었으나, 초산의 과도한 축적으로 항체 생산성의 향상은 예상에 비해 크지 않았다. 81%), C18 0(12.38%), C18: 1(25.93%), C22:6(9.95%)이며 결합지방질(結合脂肪質)은 C14 : 0(11.60%), C16 : 0(18.94%), C16: 1(10.42%). C18 : 1(10.89%), C22 : 6(23.44%)이었다. 총필수지방산(總必須脂肪酸) 함량(含量)은 극성지방질(極成脂肪質)$(20.14{\sim}31.12%)$이 비극성지방질(非極成脂肪質)$(6.97{\sim}11.13%)$보다 훨씬 높았고, 결합지방질(結合脂肪質)이 유리지방질(遊離脂肪質)보다 높았으며 부위별(部位別)로는 피부(皮部)$(15.18{\sim}15.41%)$가 육질부(肉質部)$(6.97{\sim}11.13%)$보다 높았다. 또${\omega}3$고도부포화지방산(高度不飽和脂肪酸) 함량(含量)은 육질부(肉質部)$(15.15{\sim}28.32%)$가 피부(皮部)$(6.77{\sim}18.18%)$나 내장부(內臟部)$(8.35{\sim}9.74%)$보다 높았으며, 육질부(肉質部)에서는 극성지방질(極成脂肪質)$(26.28{\sim}34.18%)$이 비극성지방질(非極成脂肪質)$(15.15{\sim}28.32%)$보다 높았다.veral world-wide prediction models. Based on the analysis, we can easilty know

• International Journal of Highway Engineering
• /
• v.8 no.2 s.28
• /
• pp.23-30
• /
• 2006

Emulsified Asphalt Mixture(EAM) is more environmentally-friendly and cost-effective than typical Hot Mix Asphalt (HMA) because EAM does not produce carcinogenic substances, e.g., naphtha, kerosene, during the both of manufacturing and roadway construction process. Also, it does not require heating the aggregates and asphalt binder. However, EAM has some disadvantages. Generally EAM has a less load bearing capacity and more moisture susceptibility than conventional HMA. The study evaluated a Fiber modified EAM (FEAM) to increase load bearing capacity and to decrease moisture susceptibility of EAM. Modified Marshall mix design was developed to find Optimum Emulsion Contents (OEC), Optimum Water Contents (OWC), and Optimum Fiber Contents (OFC). A series of test were performed on the fabricated specimen with OBC, OWC, and OFC. Tests include Marshall Stability, Indirect Tensile Strength, and Resilient modulus test. Comparison analyses were performed among EAM, Fiber modified EAM (FEAM), and typical HMA to verify the applicability of EAM and FEAM in the field. Test results indicated that both of EAM and FEAM have an enough capability to resist medium traffic volume based on the Marshall mix design criteria. Also the study found that fiber modification is effective to increase the load bearing capacity and moisture damage resistance of EAM.

• Korean journal of food and cookery science
• /
• v.15 no.2
• /
• pp.191-196
• /
• 1999

The standard cooking method of Soondae, a famous traditional sausage type food in Korea, was proposed and the applicability of porcine plasma and egg white as the substitute of the porcine blood was investigated for the improvement of off-flavor, rancidity, and acceptability of Soondae. Sensory evaluation suggested Soondae prepared with 15% porcine blood most preferred. The cooking yields, water absorption capacity and hardness of plasma and egg white added Soondae were decreased compared with those of original porcine blood Soondae. The overall results of sensory evaluation suggested the possibility of using porcine plasma or egg white as a substitute for the porcine blood in Soondae.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.36 no.1
• /
• pp.100-104
• /
• 2007

This study was carried out to investigate the microencapsulation characteristics of squid liver oil according to various ratios of wall materials and squid liver oil. The emulsion stability and the water binding capacity increased with an increase in wall materials contents. The microencapsulation efficiency was found to be in the order of 7:3>4:6>3:7>5:5>6:4 by mixing ratio of wall materials and squid liver oil; also, ratio of 7:3 was found to be inappropriate because the oil content in the powder was not sufficient. Regarding the fatty acid composition, the content of polyunsaturated fatty acid was found to be over 50% in all treatment groups. The ratio of polyunsaturated to saturated fatty acid of the powder was the highest (2.13) at the mixing ratio of 4:6.