• Journal of the Korean earth science society
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• v.33 no.7
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• pp.596-607
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• 2012

The R-Z relationship is one of important error factors to determine the accuracy of radar rainfall estimation. In this study, we have explored the effect of the R-Z relationships derived from disdrometer data in estimating the radar rainfall. The heavy rain event that produced flooding in St-Remi, Quebec, Canada has been occurred. We have tried to investigate the severity of rain for this event using high temporal (2.5 min) and spatial resolution ($1^{\circ}$ by 250 m) radar data obtained from the McGill S-band radar. Radar data revealed that the heavy rain cells pass directly over St-Remi while the coarse raingauge network was not sufficient to detect this rain event. The maximum 30 min (1 h) accumulation reaches about 39 (42) mm in St-Remi. During the rain event, the two disdrometers (POSS; Precipitation Occurrence Sensor System) were available: One used for the reflectivity calibration by comparing disdrometer Z and radar Z and the other for deriving disdrometric R-Z relationships. The result shows the significant improvement with the disdrometric reflectivity-dependent R-Z relationships against the climatological R-Z relationship. The bias in radar rain estimation is reduced from +12% to -2% and the root-mean squared error from 16 to 10% for daily accumulation. Using the estimated radar rainfall rate with disdrometric R-Z relationships, the flood event was well captured with proper timing and amount.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.6
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• pp.23-29
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• 2003

Transonic two-phase flow of Saturated humid air, in which relative humidity is 100%, with various condensation processes around thin airfoils is investigated. The study uses an extended transonic small-disturbance(TSD) model of Rusak and Lee [11, 12] which includes effects of heat addition to the flow due to condensation. Two possible limit types of condensation processes are considered. In the nonequilibrium and homogeneous process, the condensate mass fraction is calculated according to classical nucleation and droplet growth rate models. In the equilibrium process, the condensate mass fraction is calculated by assuming an isentropic process. The flow and condensation equations are solved numerical1y by iterative computations. Results under same upstream conditions describe the flow structure, field of condensate, and pressure distribution on airfoil's surfaces. It is found that flow characteristics, such as position and strength of shock waves and airfoil’s pressure distribution, are different for the two condensation processes. Yet, in each case, heat addition as a result of condensation causes significant changes in flow behavior and affects the aerodynamic performance of airfoils.

• Journal of the Korea Institute of Building Construction
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• v.10 no.1
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• pp.81-89
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• 2010

Since 2004, the government has changedthe cost estimate system to one of an actual cost basis in order to calculate the optimum construction cost by reflecting changes in circumstance on the construction site in a timely manner. Currently, this is being applied to public construction work forover a billion won of actual cost data in estimation by contract unit cost. However, directly reflecting actual cost, which for large-sized construction work was originally an average unit cost, to a small building, entails the application of a low discount rate for the cost of materials, labor, etc. and therefore can frequently give rise to cases in which the actual cost of work performed exceeds the contract sum, which in turn causes problems such as decreased revenues, bad effectson business operation, productivity, etc. Therefore, to apply actual cost to small-sized construction work (less than a billion won), there should be a plan to modify unit cost in a manner that can reflect project scale, etc. in order to resolve the problem of unit cost application of actual cost to small-building construction projects. The unit cost modification model for proper actual construction cost in small-scale construction projects developed by this study will help to increase the relevant productivity and proper gain, preventing the aggravation of business operations. Organizations placing orders are also expected to be able to secure a more realistic construction cost in arranging the budget.

• Journal of the East Asian Society of Dietary Life
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• v.23 no.3
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• pp.297-310
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• 2013

This study was performed to investigate relationships among night eating and nutrient intakes status in university students. A total of 271 subjects (male=155, female=116) were divided by using 3-days food record method according to the percentage of energy from night eating: non-night eating, <25% night-eating and ${\geq}25$ night-eating group. There were no significant differences in age, height, weight, percent body fat and BMI among the groups. The proportion of morning anorexia and insomnia was below 2% and 10%, and no differences were observed among the groups by percentage of energy from night eating. In the male subjects, the intakes of energy in the '${\geq}25$ night-eating group' was significantly higher than those of the other groups; whereas, the nutrient density (ND, nutrient intakes per 1,000 kcal) and INQ (index of nutritional quality) of vitamin $B_1$, vitamin $B_2$, vitamin C, calcium and iron in the '${\geq}25$ night-eating group' was significantly lower than those of the other groups. In the female subjects, the intakes of energy in the '<25 night-eating group' was significantly higher than that of the 'non-night eating group'. And the ND and INQ of vitamin C in the '<25 night-eating group' was significantly higher than those of the 'non-night eating group'. In addition, within the male subjects, the INQ of vitamin $B_1$, vitamin $B_2$, vitamin C, calcium and phosphorous showed significantly negative correlations with food intakes, energy intakes and percentages of energy from night eating after the values were adjusted for age. These results suggest that among male university students, night snack intakes above 25% of energy have lower micronutrient qualities of vitamin $B_1$, vitamin $B_2$, vitamin C and calcium.

• Journal of Chest Surgery
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• v.35 no.8
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• pp.611-615
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• 2002

Pneumoconiosis is fibrogenic disease, caused by inhalation of mineral dust. It is defined as the accumulation of dust in the lung and tissue reaction to its presence and the dust is considered to be an aerosal of solid and inanimate particles. It is among the most common and the most important occupational lung disease, especially in developing countries. It is required three prerequisites for making a clinical diagnosis of pneumoconiosis: 1) a full clinical and occupational history together with the result of physical examination; 2) previous X-ray for comparison; and 3) a clear understanding of the time scale involved in the progression of the diseases. Most pneumoconiosises are slow to evolve and changes in the appearances take many months -usually years- to occur. Pneumoconiosis is represented on a plain X-ray of the chest as multiple small round opacities, usually smaller than 1cm diameter. In 58 years old female patient, pneumoconiosis is manifested as $5{\times}4{\times}3$cm sized solitary pulmonary nodule without any occupational history and past history of exposure of dust. so we treated this case with right upper lobectomy. Therefore we report this case with a brief review of literatures.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.18 no.1_2
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• pp.1-8
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• 2012

Kimchi, a Korean fermented vegetable is packaged without pasteurization and distributed with live bacteria actively working to produce lactic acid and carbon dioxide gas in the product. The $CO_2$ production consisting of two distinct phases of initial fast and later slow rates depends on kimchi type, salt content and storage temperature. The $CO_2$ produced from kimchi is accumulated in the product package causing volume expansion and pressure buildup. The dependence of $CO_2$ production rate on salt content and storage temperature has been published formerly and can be used for estimating the package volume and pressure under a variety of storage conditions. As methods to alleviate the problems from the produced $CO_2$, package designs with controlled diffusion pinhole, high $CO_2$ permeable film or $CO_2$ absorber have been tried by several researchers. Properly designed packages adopting the device or tool were shown to have high dissolved $CO_2$ in kimchi without volume expansion and pressure buildup, giving good sensory quality with carbonic taste. Advantages and limitations of each method have been discussed.

• Strategy21
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• s.42
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• pp.114-153
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• 2017

고도화 및 가시화되고 있는 북한의 '잠수함발사탄도미사일(SLBM: Submarine Launched Ballistic Missile)'위협에 대응하기 위한 효과적인 전략수단으로써 핵추진잠수함의 필요성에 대한 국민적 관심이 고조되고 있다. 핵추진잠수함의 전략적 가치에 대한 논의가 활발히 진행되고 있는 가운데, 주변국과의 갈등과 국제사회의 비핵화 규범의 미 준수 논란 등 핵추진잠수함 확보과정에서 야기될 수 있는 대·내외의 정치·외교적 파장에 대한 우려의 목소리 또한 높아지고 있다. 그러나, 핵추진잠수함의 필요성 및 확보와 관련한 지금까지의 대부분의 논의들은 한국의 '내부적 논의(Just our own scenario)'에 그치는 한계를 보이고 있다. 전략무기체계로써의 상징성과 그에 따르는 대외적 민감성을 고려 시 일방적이고 독자적인 핵추진잠수함 확보노력은 과정상의 시행착오와 불확실성을 더욱 가중시켜 정책적 실패로 귀결될 수 있는 위험성을 내포하고 있다. 특히, 한반도 평화와 아태지역의 안전보장이라는 공동의 전략적 목표를 공유하고 있는 동맹국인 미국의 공감대와 지지가 뒷받침되지 않은 독자적인 핵추진잠수함 확보노력은 큰 난항이 예상되며 자칫 서로간의 '전략적 신뢰(Strategic Trust)'를 무너뜨려 '한미동맹의 결속력(Alliance Cohesion)'을 약화시키는 요인으로 작용할 수 있다. 미국의 동의와 지지에 기반한 핵추진잠수함 확보를 위해서는 한국의 핵추진잠수함 확보가 동맹의 전략목표 및 미국의 전략적 이해관계에 미칠 수 있는 긍정적, 부정적 효과에 대한 충분한 검토와 논의가 선행되어야 한다. 한미동맹의 공동의 전략목표와 미국의 전략적 이익에 상충하는 한국의 핵추진잠수함 확보시도는 성공 가능성이 낮기 때문이다. 본 연구에서는 현실화되고 있는 북한의 핵위협에 대응하고 지역안전보장에 기여할 수 있는 미국과의 연합방위력 증강차원에서의 한국의 핵추진잠수함의 전략적 효용성을 분석하였다. 더불어, 한국의 핵추진잠수함 확보과정에서 야기될 수 있는 대·내외의 기술적, 정치·외교적 사안들을 살펴본 후 한미동맹 차원에서의 정책적 해결방안을 제시하였다. 연구목적을 위해 유사한 역사적 사례연구를 통해 교훈을 도출하였으며, 미국 오바마 1기 행정부에서 미국의 아태지역 및 대북정책을 주도한 전 미국 국무부부장관 제임스 스타인버그(James Steinberg) 및 여러 미국 내 한반도 전문가들의 의견을 수렴하였다. 본 연구가 한국의 핵잠수함 확보를 위한 한미간 발전적 논의의 시발점이 되기를 기대한다.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.44 no.2
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• pp.111-116
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• 2018

In cosmetics market, anti-pollution products recently come up with new solution for skin health. Environmental oxidation mechanisms are realized as bio-marker of atmospheric pollution upon skin by environmental pollutant such as ozone, UV rays, particulate matter (PM) as well as cigarette smoke. The exposure of cigarette smoke directly or indirectly causes the oxidation of the stratum corneum skin lipids, resulting in the conversion of squalene to squalene monohydroperoxide and/or generation of malondialdehyde (MDA) as a product of lipid peroxidation. The aim of this study is to see whether new cosmetics product containing red beet has anti-oxidation effect on skin exposed by cigarette smoke. So as to determine oxidative damage to human skin at biochemical level, each unit area of volar forearms was exposed to cigarette smoke through device (3.3 cm, diameter) for fifteen minutes, then measured MDA using standardized TBARS assay kit. Compared to negative control (untreated and unexposed area), the level of MDA was significantly increased at positive control (untreated and exposed area) more than 3.7 times, indicating the pollutant induced-oxidative damage on the skin barrier. Whereas, the pre-applied area with the cosmetics products containing red beet revealed a decrease of 25% compared with positive control. As reports, these data demonstrated that cigarette smoke induce peroxidation of stratum corneum skin lipids. Conclusively, we suggest that anti-pollution effect of the cosmetics product containing red beet is beneficial to prevent the oxidation of skin lipids by atmospheric pollution.

• Korean Journal of Communication Studies
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• v.25 no.5
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• pp.81-101
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• 2017

The purpose of this paper is two folds: Korean media contents, which has led the Korean Wave in China in 1990s will be reviewed, and the causes of the negative feelings of Korean Wave that have occurred among Chinese netizens will be factored out in order to suggest the solutions to this conflict situation. The reviews and comments on the China's major portal site, Tienya were analyzed by the key words that causes the conflict between China and Korea. Of the total 340,000 responses, politics, history and entertainment are categorized by the keywords, and the largest portion of the netizen's comments are found to be political issues with 34%, particularly the issues related to the THAAD. This means that the negative feeling toward the Korean Wave is more closely related to politics rather than the media contents. Therefore, in order to overcome the negative feelings in China and maintain the stable relationship with the two countries in the midst of the changing US-China situation, it is necessary to lead the media business with high quality contents along with the mutual understanding and cooperation of the media content producers. It is also necessary to try to approach Chinese market in a cooperative and stable way through co-production or joint venture with Chinese media. In consequence, the excellence of Korean cultural contents and the cultural ties with Chinese media market will be identified with in-depth understanding of Chinese nationalism, Sinocentrism and Chinese culture.

• Korean Journal of Remote Sensing
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• v.39 no.5_4
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• pp.1135-1144
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• 2023

Many agricultural reservoirs in South Korea, constructed before 1970, have become aging facilities. The majority of small-scale reservoirs lack measurement systems to ascertain basic specifications and water levels, classifying them as unmeasured reservoirs. Furthermore, continuous sedimentation within the reservoirs and industrial development-induced water quality deterioration lead to reduced water supply capacity and changes in reservoir morphology. This study utilized Light Detection And Ranging (LiDAR) sensors, which provide elevation information and allow for the characterization of surface features, to construct high-resolution Digital Surface Model (DSM) and Digital Elevation Model (DEM) data of reservoir facilities. Additionally, bathymetric measurements based on multibeam echosounders were conducted to propose an updated approach for determining reservoir capacity. Drone-based LiDAR was employed to generate DSM and DEM data with a spatial resolution of 50 cm, enabling the display of elevations of hydraulic structures, such as embankments, spillways, and intake channels. Furthermore, using drone-based hyperspectral imagery, Normalized Difference Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI) were calculated to detect water bodies and verify differences from existing reservoir boundaries. The constructed high-resolution DEM data were integrated with bathymetric measurements to create underwater contour maps, which were used to generate a Triangulated Irregular Network (TIN). The TIN was utilized to calculate the inundation area and volume of the reservoir, yielding results highly consistent with basic specifications. Considering areas that were not surveyed due to underwater vegetation, it is anticipated that this data will be valuable for future updates of reservoir capacity information.