• Fisheries and Aquatic Sciences
• /
• v.9 no.2
• /
• pp.75-82
• /
• 2006

We evaluated the utility of applying isozyme analysis and two tagging methods, visible implant fluorescent elastomer (VIE) injection and uropod-cutting, to monitor the effects of releasing nursery-reared fleshy prawn (Fenneropenaeus chinensis) into natural habitat in Korea. One hundred thousand farmed prawns (70 mm long) were tagged by clipping off the outer left uropod and injecting them with VIE. This marked seed population was released at Muchangpo, Korea, on 11 and 19 July 2002. Two months later, total catch and catch per unit effort (CPUE) at three locations (Hongwon, Muchangpo, and Anmyundo) were determined. Total catch and CPUE increased nearly 18% over the previous year in Hongwon and Muchangpo. The mixing rate, estimated by uropod regeneration pattern, was 0.33% at Hongwon, 0.53% at Muchangpo, and 0.21% at Anmyundo. The recapture rate was about 3.5%. Isozyme analysis confirmed that the mixing rate was highest at Muchangpo. Moreover, fleshy prawns from Muchangpo were genetically most related to the seed population, indicating that the released prawns had largely remained near the released site. We also confirmed that isozyme genes are valuable as genetic markers for qualitative analyses of a released seed population.

• Journal of Korean Academy of Nursing
• /
• v.33 no.5
• /
• pp.553-561
• /
• 2003

Purpose: To develop a substantive theory that represents hospital nurses' experience on caring for dying patients. Method: Grounded theory method guided the data collection and analysis. A purposeful sample of 15 hospital nurses participated during the period of 2001-2002. The data were collected by semi-structured individual interviews. All interviews were audio taped and transcribed verbatim. Constant comparative analysis was employed to analyze the data. Result: 'Putting oneself into shape while being faithful to feelings and emotions' emerged as the basic social-psychological process. Three different phases were identified: being faithful to own feelings and behaviors; putting oneself into shape; and mourning death. The first phase includes the categories of 'establishing trust relationships' and 'sympathizing with dying patients and their family members.' The second phase consists of 'controlling feelings,' 'adjusting ethical conflicts,' and 'providing best patient-care,' and 'helping family accept the jeath.' And the third phase consists of 'overcoming sadness' and 'releasing other negative feelings.' Conclusion: The result of this study will help health professionals develop efficient support programs that support nurses caring for dying patients in hospitals. Further study needs to be done to verify findings.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.3
• /
• pp.206-210
• /
• 2015

The most important thing for NOVEC gas fire extinguishing equipment is to release NOVEC gas, which contained in the extinguishing container, to the safety section by the time appointed. For this matter, it is significant to decide arrangement and size of the proper piping equipment. This study has developed the design methodology of NOVEC gas fire extinguishing equipment in use of pipe network analysis techniques. Based on the design methodology, each design coefficient is chosen. It is found that the calculated result, which is 6.498 seconds, has been counted within the 10 seconds limit, which is fairly satisfied with extinguishing releasing time based on the developed methodology. At that time, the pressure loss is 21.09bar.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.05a
• /
• pp.503-506
• /
• 2015

Ever since Samsung Electronics has released its first Galaxy Note series, it has been releasing a new different Galaxy model every year and now Galaxy Note 4 has been released in 2015. The consumers' interest in 'Phablet' has been growing since the release of Galaxy Note 1, and the market share rate for Phablet, which was only about 2 % out of the entire mobile phone market in 2013, has grown to 10% within just a year. This thesis analyzed the response of consumers about the Phablet, and expected the future of the Phablet market. Consumer behavior analysis was conducted through a questionnaire.

• Journal of the Korean Society of Safety
• /
• v.31 no.1
• /
• pp.139-147
• /
• 2016

Nuclear energy is considerably cheap and clean compared to other fossil fuels. Yet, there are rising safety concerns of nuclear power plants including the possibility of radiation releasing nuclear accidents. In light of the Fukushima nuclear crisis in 2011, Japan has been re-evaluating their existing energy policies and increasing the share of alternative energy. This paper first tracks the major historical changes of energy policy in Japan by time period. Next, energy security, reignited concerns and alternative energy are covered to examine Japan's energy security situation and its transition after the Fukushima disaster. Lastly, a short survey based on thematic analysis was conducted in South Korea and Japan to understand the public awareness of nuclear. This paper postulates that the case of Fukushima will contribute to establish and operate a safe-future nuclear program in South Korea, given that the country is not only geographically neighbouring Japan but also the world's fourth largest producer of nuclear energy.

• Journal of Korea Foundry Society
• /
• v.13 no.4
• /
• pp.323-332
• /
• 1993

An implicit finite difference formulation with three methods of latent heat treatment, such as equivalent specific heat method, temperature recovery method and enthalpy method, was applied to solidification analysis. The Neumann problem was solved to compare the numerical results with the exact solution. The implicit solutions with the equivalent specific heat method and the temperature recovery method were comparatively consistent with the Neumann exact solution for smaller time steps, but its error increased with increasing time step, especially in predicting the solidification beginning time. Although the computing time to solve energy equation using temperature recovery method was shorter than using enthalpy method, the method of releasing latent heat is not realistic and causes error. The implicit formulation of phase change problem requires enthalpy method to treat the release of latent heat reasonably. We have modified the enthalpy formulation in such a way that the enthalpy gradient term is not needed, and as a result of this modification, the computation stability and the computing time were improved.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• v.33 no.3
• /
• pp.69-85
• /
• 2020

Objectives : The purpose of this study is to investigate the trend of Tranditional Chinese Medicine for Otitis Media with Effusion(OME) in Chinese journals. Methods : Chinese National Knowledge Infrastructure(CNKI) and Wanfang med online were used to search Chinese studies which were published from January, 2010 to April, 2020. Results : Among Chinese studies, Exterior-releasing medicinal(解表藥) and Heat-clearing medicinal(淸熱藥) were the most frequently used. The herbs which used the most frequently are Bupleuri Radix(柴胡), Acori Graminei Rhizoma(石菖蒲). All of studies have reported that Tranditional Chinese Medicine is effective for Otitis Media with Effusion. Conclusions : In analysis of selected studies, Tranditional Chinese Medicine is more effective than Western Medicine Treatments. Recurrence rates and side effects of OME can be reduced by cotreatment of Tranditional Chinese Medicine and Western Medicine Treatments.

• Journal of Powder Materials
• /
• v.26 no.3
• /
• pp.220-224
• /
• 2019

The aluminum (Al)/copper oxide (CuO) complex is known as the most promising material for thermite reactions, releasing a high heat and pressure through ignition or thermal heating. To improve the reaction rate and wettability for handling safety, nanosized primary particles are applied on Al/CuO composite for energetic materials in explosives or propellants. Herein, graphene oxide (GO) is adopted for the Al/CuO composites as the functional supporting materials, preventing a phase-separation between solvent and composites, leading to a significantly enhanced reactivity. The characterizations of Al/CuO decorated on GO(Al/CuO/GO) are performed through scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy mapping analysis. Moreover, the functional bridging between Al/CuO and GO is suggested by identifying the chemical bonding with GO in X-ray photoelectron spectroscopy analysis. The reactivity of Al/CuO/GO composites is evaluated by comparing the maximum pressure and rate of the pressure increase of Al/CuO and Al/CuO/GO. The composites with a specific concentration of GO (10 wt%) demonstrate a well-dispersed mixture in hexane solution without phase separation.

• Nuclear Engineering and Technology
• /
• v.51 no.7
• /
• pp.1758-1764
• /
• 2019

As the safety level of nuclear power plants (NPPs) relates to the safety of individuals, society, and the environment, it is important to establish NPP safety goals. In Korea, two quantitative health objectives and one large release frequency (LRF) criterion were formally set as quantitative safety goals for NPPs by the Nuclear Safety and Security Commission in 2016. The risks of prompt and cancer fatalities from NPPs should be less than 0.1% of the overall risk, and the frequency of nuclear accidents releasing more than 100 TBq of Cs-137 should not exceed 1E-06 per reactor year. This paper reviews the hierarchical structure of safety goals in Korea, its relationship with those of other countries, and the relationships among safety goals and subsidiary criteria like core damage frequency and large early release frequency. By analyzing the effect of the release of 100 TBq of Cs-137 via consequence analysis codes in eight different accident scenarios, it was shown that meeting the LRF criterion results in negligible prompt fatalities in the surrounding area. Hence, the LRF criterion dominates the safety goals for Korean NPPs. Safety goals must be consistent with national policy, international standards, and the goals of other counties.

• Elastomers and Composites
• /
• v.56 no.2
• /
• pp.72-78
• /
• 2021

A phase-change material (PCM) is a material that has the ability to delay heat transfer by absorbing heat from its environment or releasing heat to its environment while its phase changes from solid to liquid or liquid to solid at a specific temperature. As it is applied, it can contribute to environmental conservation such as energy savings and carbon dioxide emission reduction. In order for a PCM to store and release heat, the volume change during its phase transition should be large, and thus a phase transition space is required. When a PCM is used as a polymer additive, it is confined within the polymer, and there is no phase transition space; thus, its ability to absorb and release heat is significantly reduced. Therefore, in this study, porous silica was used to provide EVA/PCM compounds with sufficient space for their phase transition, and to improve the compatibility between the EVA and PCM, modified silica is used: surface-modified 5 wt% silica with 3-methacryloxypropyltrimethoxysilane. The compound was prepared and compared with the silica compound. The presence or absence of the modified silica surface modification was confirmed using Fourier-transform infrared spectroscopy and thermogravimetric analysis, the heat capacity of the compound was evaluated based on a differential scanning calorimetry analysis, and its mechanical strength and morphology were determined using scanning electron microscopy.