• Journal of Korean Society for Atmospheric Environment
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• v.33 no.4
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• pp.333-341
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• 2017

Recently, the earth has shown the limit of environmental capacity. It is also experiencing an environmental crisis with rising energy prices and depletion of coal. Therefore, development of renewable energy is very important solution. However, waste fuel solid are renewable fuels, but they cause environmental problems. In this study, the emission characteristics of hazardous air pollutants were analyzed through measurements at the facilities using solid fuels (SRF, BIO-SRF). Analysis method of PAHs are based on the Korea Standard Methods for Examination. The analysis of PAHs showed that the concentration much higher in Naphthalene, and Benzo(a)pyrene showed at a higher concentration incertain sources. As a result of gas phase and particle phase PAHs, most of Benzo(a)pyrene appeared to be particulate. Through the results of this study will provide basic data for atmospheric environmental management.

• The Journal of Korean Academic Society of Nursing Education
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• v.26 no.2
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• pp.111-122
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• 2020

Purpose: In the Fourth Industrial Revolution, nursing education will change in a different way than before. The purpose of this study was to analyze characteristics of qualitative research on learning experiences for nursing students, and to suggest directions for nursing education geared to the needs of the future. Methods: An integrative review method was used. Based on Whittemore & Knafl's approach, five steps were applied. Results: Eleven papers met the selection criteria and had above average ratings in quality appraisals. Three characteristics related to the learning experiences of nursing students were derived: (1) overcoming difficulties in the learning process and concentrating on problem-solving, (2) improving self-efficacy through experiencing achievement in the learning process, (3) establishing nursing professionalism, (4) identifying the importance of self-directed and self-reflected learning, and (5) developing teamwork. Conclusion: This review found that various learning experiences were conducted for practical experience and learner-oriented learning. Nursing students overcame difficulties to achieve their learning outcomes, and developed their professionalism. Further study is required to comprehensively explore research including other countries, and the experiences of instructors.

• Korean Journal of Adult Nursing
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• v.17 no.4
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• pp.592-601
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• 2005

Purpose: The purpose of this study was to investigate differences in smoking related characteristics and psychological features of coronary artery patients by the stages of change in smoking cessation behaviors. Method: Subjects for this survey were 97 patients who were smoking when doctors diagnosed them to have coronary artery diseases. Result: Subjects were distributed 21.6% in precontemplation stage, 24.7% in contemplation stage, 17.5% in preparation stage, 19.6% in action stage, and 16.5% in maintenance stage respectively. The numbers of previous attempts to quit smoking of subjects in precontemplation stage(mean=3.00, SD=3.71) and contemplation stage(mean=2.63, SD=2.32) were significantly lower than that of subjects in preparation stage(mean=5.82, SD=6.20). Benefit scores of subjects in maintenance stage were significantly greater than those of subjects in precontemplation stage. Self-efficacy, barriers, seriousness, and nicotine dependency were not significantly different by the stages of change. Number of signs and symptoms related to smoking which subjects were experiencing were not significant by the stages of change too. Conclusion: Future intervention programs for smoking cessation should be focused on the strategies to enhance the realization of health benefits that patients might acquire from smoking cessation.

• Journal of Korean Society on Water Environment
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• v.25 no.6
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• pp.964-971
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• 2009

In this paper, activated sludge settling was characterized based on field trip and zone settling tests. Plants used for this study include 5 conventional activated sludge processes and 3 A2O type treatment processes. The treatment capacities are in the range from 12,000 to $250,000m^3$/day. Total number of zone settling tests were 188 set and SVI values representing settling characteristics were from 100 to 300 mL/g. It was found out that zone settling velocity of these examined plant sludges can be approximated by mean values calculated by Keinath and Daigger/Roper models. Based on these three models, solid flux analysis were carried out in order to compare design criteria ($3.96{\sim}6.04kg/m^2-hr$) recommended by Korea Sewage Facility Design Guideline with two models used in USA. The results show that design criteria are only applicable for normal condition in settling characteristics (below SVI 100 mL/g). Solid flux analysis of surveyed plants indicates that most of the plants are operated underload conditions except several plants experiencing poor sludge settling problem. Most of the plants are operated under high sludge blanket depths (SBD).

• Journal of Communications and Networks
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• v.4 no.4
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• pp.266-281
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• 2002

The General Packet Radio Service (GPRS) is being deployed by GSM network operators world-wide, and promises to provide users with “always-on” data access at bandwidths comparable to that of conventional fixed-wire telephone modems. However, many users have found the reality to be rather different, experiencing very disappointing performance when, for example, browsing the web over GPRS. In this paper, we examine the causes, and show how unfortunate interactions between the GPRS link characteristics and TCP/IP protocols lead to poor performance. A performance characterization of the GPRS link-layer is presented, determined through extensive measurements taken over production networks. We present measurements of packet loss rates, bandwidth availability, link stability, and round-trip time. The effect these characteristics have on TCP behavior are examined, demonstrating how they can result in poor link utilization, excessive packet queueing, and slow recovery from packet losses. Further, we show that the HTTP protocol can compound these issues, leading to dire WWW performance. We go on to show how the use of a transparent proxy interposed near the wired-wireless border can be used to alleviate many of these performance issues without requiring changes to either client or server end systems.

• Korean Institute of Interior Design Journal
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• v.15 no.6 s.59
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• pp.247-254
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• 2006

Apparently light does exist even if it does not have certain form that an object might have. The history of architecture can be told as the history of light. As various master architects as well as scholars mentioned, light has been recognized as one of the most important aspects in perceiving space. Although there are complex multi dimensions in body sense and perception, experiencing space through light is preliminary formed by the outline to the degree of brightness. Light gives space specific and unique character by limiting or enlarging the space by wrapping an object or by reflection of material surfaces or by the intensity of light itself. It is fundamentally important to recognize the essential relationship between light and perception of space through various medias such as material, form, movement and so on. Three types of space perception and cognition by light that have been categorized after studying the most significant writings on light become the core method to further analyze the selected case projects. In this research, we will study how interior space is expressed through different light conditions with above mentioned characteristics and how such expressions can be applicable to the design of interior space.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.6
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• pp.642-651
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• 2009

The history of excavator design is not long enough which still causes most of the design considerations to be focused on static analysis or simple functional improvement based on static analysis. However, the real forces experiencing on each component of excavator are highly transient and impulsive. Therefore, the prediction and the evaluation of the movement of the excavator by dynamic load in the early design stage through the dynamic transient analysis of the excavator and ensuring of design technique plays an importance role to reduce development-cost, shorten product-deliver, decrease vehicle-weight and optimize the system design. In this paper, Commercial software DADS and ANSYS help to develop the track model of the crawler type excavator, and to evaluate the performance and the dynamic characteristics of excavator with various simulations. For that reason, the track of crawler type excavator is modelled with DADS Track Vehicle Superelement, and the reaction forces on the track rollers were predicted through the driving simulation. Also, the upper frame and cabin vibration characteristics, at the low RPM idle state, were evaluated with engine rigid body modelling. And flexibility body effects were considered to determine the more accurate joint reaction forces and accelerations under the upper frame swing motion.

• Journal of the Korean Society of Food Culture
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• v.34 no.2
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• pp.159-167
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• 2019

The purpose of this study is to provide basic information to improve understanding of contemporary kimchi culture in Korea. Many Koreans are now purchasing kimchi at markets, while the proportion of self-preparation is gradually decreasing. This commodification tendency of kimchi is considered to be associated with changes in consumer's behavior and attitude. In this study, a linear regression and a logistic regression model were used to identify relationships between kimchi consumption behavior and household characteristics. The results showed that the probability of kimjang activity was positively related with family size, possession of a kimchi refrigerator, self-preparation practice, and the intensity of sharing behavior. I also found that kimchi consumption volume per capita of 'purchasing' household was greater than that of 'self-preparing ' or 'sharing-dependent' households, and that the number of family members was inversely related with kimchi consumption volume per capita. The inverse relationship between family size and kimchi consumption volume per capita is considered to be contrary to the widespread thoughts in Korea, which have been developed while experiencing kimchi preparation and consumption in traditional extended families. I think that the relationship comes from differences in menu varieties, which appear to vary with family size. This issue will be investigated in subsequent studies.

• International Journal of Advanced Culture Technology
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• v.9 no.4
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• pp.204-212
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• 2021

Ethical sensitivity is a basic competency required for nursing students to work as professionals who will care patients in the clinical field after graduation. Therefore, efforts are needed to improve the knowledge on ethical sensitivity in undergraduate education. This study aimed to identify the demographic characteristics that influence ethical sensitivity among nursing students. This study was a secondary analysis that referred to a previous work measuring ethical sensitivity in nursing students. The participants were 128 nursing students, who had experienced clinical practicums. Among the participants, those who were third-year (t=2.345, 95% CI=[1.24, 14.64], p=0.021), female (t=2.635, 95% CI=[3.65, 25.69], p=0.009) and were satisfaction with major (t=-2.389, 95% CI=[-16.54, -1.50], p=0.019) consistently reported significantly higher mean scores on ethical sensitivity. The explanatory power of the model was 13.3%. Gender (Exp (B)=0.875, 95% CI=[0.804, 0.952], p=0.002) and year at universtiy were the strongest predictors of ethical sensitivity (Exp (B)=0.921, 95% CI=[0.873, 0.971], p=0.002). Based on the results, an appropriate ethics education that considers the following issues should be provided for undergraduate nursing students: both genders' perspectives, seniors' further development, and students experiencing low satisfaction with their major. Future nursing education should consider these individual demographic characteristics to develop nursing students' ethical sensitivity that will further affect their ethical behavior and ultimately improve the quality of nursing.

• Journal of the Korean Society of Food Culture
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• v.24 no.6
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• pp.692-701
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• 2009

Green tourism has recently focused on an alternative plan for activating a rural economy and coping with an income inequality between urban and rural areas. The Rural Development Administration has supported farm restaurants with the aim of increasing the income of farmers, determined unique native local foods and developed programs based on the experience rural life since 2007. Farm restaurants, which are the new type of local food restaurants, have unique food and various experiencing programs that reflect their own regional characteristics. We would like to understand how the farm restaurants have been developed and what types of characteristics they have based on the currently operating farm restaurants. The management situations and value of farm restaurants as tourist attractions were investigated as well in the tools for rural development.