식·약용으로 사용되고 있는 흰점박이꽃무지(Protaetia brevitarsis) 유충은 가공 전처리 시 배변 유도 섭식물로 찹쌀과 비지를 사용하고 있으나 생산비 절감, 영양적 가치 증대, 이취감 저감을 목적으로 가공부산물로 대체할 필요가 있다. 본 연구는 유충의 배변유도섭식물로 홍삼박, 구기자박, 흑마늘박, 마늘부산물 등을 활용하여 이에 대한 효과를 구명하고, 전처리 조건을 확립하였다. 이를 위해 섭취 한 후 배변유도, 체중 감소율, 생존율, 지표물질 등을 조사하였다. 가공부산물을 섭식한 유충의 섬유질 함량은 모든 처리구에서 무처리(절식) 9.91% 보다 낮은 섬유질 함량을 보였다. 유 충의 일별 체중 감소율과 생존율을 회귀분석하여 가공부산물 투입에 따른 사육 용기(264×194×192 mm (W×H×D)) 내 적정 마릿수를 추정한 결 과 홍삼박과 흑마늘박 섭식구가 180과 175마리로 다른 처리에 비해 높은 경향을 보였다. 유충의 살처리 및 동결건조방법에 따른 total ginsenoside, betaine, pyruvate함량은 -20°C 냉동 처리 후 동결건조한 것이 가장 높았으며, 특히 냉동 후 동결건조 처리한 홍삼박 섭식구의 total ginsenoside함 량은 다른 처리에 비해 월등히 높은 경향을 보였다. 따라서 흰점박이꽃무지 유충은 가공 전처리 시 배변 유도 섭식물로 홍삼박을 사용하여 냉동 후 동결건조하는 것이 가장 적합한 것으로 사료된다.

In this study, two alignment methods were used to create a Fringe-Field Switching (FFS) mode liquid crystal device using an organic thin film (polyimide: PI) as an alignment layer. In addition, the electro-optical (EO) characteristics of the liquid crystal device manufactured in this way were investigated to evaluate the feasibility of mass production application of the technology. In general, the photo-alignment method using unpolarized ultraviolet rays can obtain a relatively low pretilt angle, so a liquid crystal device in FFS mode, which is a driving mode of the liquid crystal device that reflects the characteristics of liquid crystal alignment, was manufactured, and the liquid crystal has a high reactivity with the alignment film. Considering this, nematic liquid crystal (NLC) was used. In addition, in order to improve the misalignment, it was observed whether more stable orientation occurred by irradiating ultraviolet rays for an additional 1 to 3 hours in the aligned state. As a result of the experiment, it was found that NLC alignment occurs through a photodecomposition reaction caused by unpolarized UV irradiation oblique to the PI surface. In addition to the existing orientation method, UV irradiation was used to achieve a more stable orientation state and stable V-T curve and response characteristics. With liquid crystal alignment completed, more stable orientation characteristics and EO characteristics at the mass production level were obtained through additional UV irradiation for 3 hours. This method can further stabilize the orientation stability caused by existing UV irradiation through an additional process.

Herein, the existing structural design criteria for highway bridge columns with hollow bars were analyzed. Expanding upon previous research focused on the performance analysis of the columns under compressive loads, load– displacement curves were evaluated and crack analysis was performed under cyclic transverse loads. A three-dimensional nonlinear finite-element structural analysis compared the structural performance of existing steel bars, same-reinforced hollow bars, and reduced hollow bars in detail. Results indicated that with regard to elastic or initial crack behavior, the existing steel bars can be replaced by the other bars. Future research should delve into inelastic behavior and strategies to ensure seismic performance.

In the automotive information display device industry, products with high reliability and wide temperature conditions are required, and interest in products that do not cause lighting defects even under extremely low temperature conditions is increasing. In this experiment, we produced an LED backlight unit for car navigation in a cryogenic environment. And to make this backlight unit, we used 12 side-emitting white LEDs with 3[W] high power LEDs. This backlight unit emits up to 18,000[nits] at a power consumption of 36[W] and has a startup voltage time of less than 1[ms] at -50° ambient temperature.

본 연구는 자기인식이 정신건강 지표로서 삶의 만족과 우울, 불안에 미치는 영향을 검증하는 데 목적이 있다. 300 명의 청소년을 대상으로 자기인식, 삶의 만족, 우울, 불안을 포함한 온라인 설문을 실시하였고, 다중회귀분석을 통해 변인 간 관계를 관찰해보았다. 연구 결과, 청소년의 전반적인 자기인식은 삶의 만족, 우울, 불안에 유의한 영향을 미치고 있었다. 또한 자기인식을 내적‧대인관계적‧환경적 자기인식의 세 차원으로 구분하여 정신건강에 미치는 효과 를 확인한 결과, 삶의 만족은 대인관계적‧환경적 자기인식으로부터 예측된 반면, 우울과 불안은 내적 자기인식으로부 터 예측되었다. 이 결과는 청소년의 자기인식이 전반적으로는 정신건강에 영향을 두루 미치지만, 긍정적‧부정적 정서 요인은 자기인식의 유형에 따라 변별적으로 영향을 받는다는 점을 보여주고 있다. 본 연구를 통해 청소년기에 정신 건강을 증진하고 삶의 질을 높이는 과정에서 자기인식이 중요하다는 점을 구체적으로 확인할 수 있었다.

본 연구의 목적은 노년기 정서지능을 나타내는 대표적인 요인인 정서인식명확성이 노인들의 낮은 사회적 상호작 용 불안을 예측하는지를 확인하고, 그 경로에서 자존감과 자기효능감이 매개하는지를 검증하는 것이다. 대한민국 노 인 217명을 대상으로 정서인식명확성, 사회적 상호작용 불안, 자존감, 자기효능감을 측정하는 설문을 온라인으로 실 시하였다. 분석 결과, 노인의 정서인식명확성은 사회적 상호작용 불안을 부적으로 예측하였다. 또한 매개분석 결과, 자존감은 정서인식명확성과 사회적 상호작용 불안의 관계를 매개한 반면, 자기효능감은 결과가 일관되지 않았다. 즉, 자신의 정서를 명확하게 인식하는 것은 개인의 자존감을 높여 사회적 상호작용 불안을 줄이지만, 이러한 매개효과는 자기효능감을 통해서는 명확하게 확인할 수 없었다. 이 결과는 노년기에 타인과의 상호작용을 원활하게 하기 위해서 는 명확한 정서인식이 필요하다는 점을 강조하면서, 이것이 특히 건강한 자기 개념 중 자신에 대한 존중감을 높이기 때문이라는 점을 보여주고 있다. 끝으로 본 연구의 함의와 추후 연구에 대한 방향을 논의하였다.

As a result of active geological investigation of faults in Korea, many Quaternary faults have been identified and some of them were judged to have potential to generate earthquakes. Those faults need to be considered as additional seismic sources in the seismic hazard analysis. When a fault is introduced as a new source, the earthquakes generated by the fault should be removed from the area sources that include any part of the fault, to avoid double counting. In practice, however, double counting cannot completely be avoided as the complete separation of the fault-generated earthquakes from the area sources is impossible due to uncertainties related to the earthquake location, subsurface structures of faults, etc. When a new fault source is introduced, the only constraint is the invariance of earthquake frequency. The maximum earthquake and the Richter-b value should also be subject to change, but there are no competent approaches to estimate the change due to incomplete separation of earthquakes. To gain insight into the effect of a new fault source, an example calculation of the seismic hazard were carried out. The example calculation shows that addition of a new fault source centers seismic hazard around the fault source.

기존의 정서연구들에서는 감정표현불능증이 우울의 중요한 예측변인이라는 점을 반복적으로 제시하고 있다. 이에 본 연구에서는 이러한 두 변인의 관계가 성격요인에 의해 조절될 수 있는지를 성격 5요인을 중심으로 살펴보았다. 312명의 대학생을 대상으로 감정표현불능증, 우울, 성격 5요인을 포함한 온라인 설문을 실시하고 조절효과를 확인해 보았다. 분석 결과, 감정표현불능증은 우울을 예측하여 기존 연구 흐름과 맥을 같이 하였다. 또한, 조절효과를 검증한 결과, 우호성, 정서적 안정성, 개방성은 감정표현불능증과 우울 간의 관계를 조절한 반면, 외향성과 성실성은 조절하 지 않았다. 본 연구의 결과는 자신의 감정을 제대로 인지하지 못하고 표현하지 못하는 것이 우울을 높일 수 있는데, 이를 완화하는 데는 우호적이고 정서적으로 안정적이며 개방적인 성격이 도움이 된다는 점을 제시하였다. 본 연구는 감정표현불능증에 의해 우울이 증가하는 과정에서 어떤 구체적인 성격특질이 조절변인으로 기능하는지를 변별적으 로 제시하였다는 중요한 함의를 갖고 있다.

The electroconvection generated on the surface of an ion exchange membrane (IEM) is closely related to the electrical/ chemical characteristics or topology of the IEM. In particular, when non-conductive regions are mixed on the surface of the IEM, it can have a great influence on the transfer of ions and the formation of nonlinear electroconvective vortices, so more theoretical and experimental studies are necessary. Here, we present a novel method for creating microscale non-conductive patterns on the IEM surface by laser ablation, and successfully visualize microscale vortices on the surface modified IEM. Microscale (~300 μm) patterns were fabricated by applying UV nanosecond laser processing to the non-conductive film, and were transferred to the surface of the IEM. In addition, UV nanosecond laser process parameters were investigated for obvious micro-pattern production, and operating conditions were optimized, such as minimizing the heat-affected zone. Through this study, we found that non-conductive patterns on the IEM surface could affect the generation and growth of electroconvective vortices. The experimental results provided in our study are expected to be a good reference for research related to the surface modification of IEMs, and are expected to be helpful for new engineering applications of electroconvective vortices using a non-conductive patterned IEM.

The electromembrane process, which has advantages such as scalability, sustainability, and eco-friendliness, is used in renewable energy fields such as fuel cells and reverse electrodialysis power generation. Most of the research to visualize the internal flow in the electromembrane process has mainly been conducted on heterogeneous ion exchange membranes, because of the non-uniform swelling characteristics of the homogeneous membrane. In this study, we successfully visualize the electroconvective vortices near the Nafion homogeneous membrane in PDMS-based microfluidic devices. To reinforce the mechanical rigidity and minimize the non-uniform swelling characteristics of the homogeneous membrane, a newly developed swelling supporter was additionally adapted to the Nafion membrane. Thus, a clear image of electroconvective vortices near the Nafion membrane could be obtained and visualized. As a result, we observed that the heterogeneous membrane has relatively stronger electroconvective vortices compared to the Nafion homogeneous membranes. Regarding electrical response, the Nafion membrane has a higher limiting current and less overlimiting current compared to the heterogeneous membrane. Based on our visualization, it is assumed that the heterogeneous membrane has more activated electroconvective vortices, which lower electrical resistance in the overlimiting current regime. We anticipate that this work can contribute to the fundamental understanding of the ion transport characteristics depending on the homogeneity of ion exchange membranes.

Ion-beam irradiation(IB) on HfO2 surface induced high-performance liquidcrystal(LC) driving at a 1-V threshold with vertical alignment of liquid crystals(LC). The high-k materials Atomic layer deposition was used to obtain LC orientation on ultra thin and high-quality films of HfO2 layers. To analyze surface morphological transition of HfO2 which can act as physic alignment effect of LC, atomic force micro scopy images are employed with various IB intensities. The contact angle was measured to elucidate the mechanism of vertical alignment of LC on HfO2 with IB irradiation. Contact angle measurements show the surface energy changes via IB intensity increasing.

Climate change due to global warming causes a rise in atmospheric air temperature to rise and extreme shift in precipitation patterns. Carbon dioxide (CO2) is widely known as one of the major cause of global warming and accounts for about 72% of total greenhouse gas emissions. Agriculture is more vulnerable to climate change than other industries. Many studies have been conducted to investigate how agroecosystems, both natural and controlled, will respond to the rising level of CO2. Studies on the responses of crops and agricultural environments to climate change are crucial in predicting changes in agro-ecosystems. Research facilities for various types of CO2 treatment have been developed. The representative research facilities are SAR (Soil-Plant-Atmosphere-Research), OTC (Open Top Chamber), FACE (Free Air CO2 Enrichment System), and TGC & CTGC (Temperature Gradient Chamber & CO2-Temperature Gradient Chamber). Therefore, this study reviewed research data and their application in agriculture.

In this study, kombucha was prepared by adding 0%, 25%, 50%, 75%, and 100% of Orostachys japonicus as a natural functional source to broaden its usage and obtain valuable data for fermented beverage research. The kombucha’s pH and sugar content decreased during the fermentation period, but its acidity level increased during the same period. Additionally, its L value increased after decreasing, its a value decreased after increasing, its b value continued to increase, and its sugar reduction increased and then decreased. In the sensory characteristic strength evaluation, its color, fermented odor, and sour taste became stronger, but its sweetness became less. As a result of preference evaluation, fragrance and swallowing capability stood the highest in the 25% addition group, color and taste were the highest in the 50% addition group, and overall preference was highest in the 50% addition group. Total flavonoids, total polyphenols, DPPH, ABTS radical scavenging ability, and reducing power increased until the third day of the experiment and decreased afterward. Therefore, the study determined that fermenting kombucha with 50% Orostachys japonicus extract for 9 days would increase its quality characteristics and provide the most palatability.