• 융합정보논문지
• /
• 제10권6호
• /
• pp.41-48
• /
• 2020

수중 IoT 네트워크에서 센서 노드는 지속적인 전력 공급이 어렵기 때문에 제한된 상황에서 소비 전력과 네트워크 처리량의 효율성이 매우 중요하다. 이를 위해 기존의 무선 네트워크에서는 SNR(Signal Noise Rate)과 BER(Bit Error Rate)의 높은 연관성을 기반으로 적응적으로 통신 파라미터를 선택하는 AMC(Adaptive Modulation and Coding) 기술을 적용한다. 하지만 본 논문의 실험 결과, 수중에서 SNR과 BER 사이의 상관 관계가 상대적으로 감소함을 확인하였다. 따라서 본 논문에서는 SNR과 함께 다중 파라미터를 동시에 사용하는 딥러닝 기반 BER 예측 모델(MLP, Multi-Layer Perceptron)을 적용한다. 제안하는 BER 예측 모델은 처리량이 가장 높은 통신 방법을 찾아낼 수 있고, 시뮬레이션 결과 85.2%의 높은 정확도와 네트워크 처리량은 기존 처리량보다 4.4배 높은 성능을 보여주는 우수한 성능을 확인하였다.

• 농촌계획
• /
• 제17권1호
• /
• pp.89-98
• /
• 2011

Recently, the food industry has evolved into a new and innovative trend according to its globalization and change of food consumption patterns. However, it is hard for the traditional food industry in Korea to meet the changing consumers' needs because of its poorer quality control and lower industrialization technology than other advanced industries. Also the knowledges acquired through a lot of time and efforts would be lost after the human resources with tacit knowledges leave by their too much aging. Especially, the 21st century would be called as knowledge based society which means that knowledge be the important contributing factor in the economic growth. In this regard, this study aimed at proposing the knowledge based system for systematically managing or preserving knowledges of Mosisongpyun industry in Yeonggwang County to seek for the sustainable development of the traditional food industry in Korea. The knowledge based system of Mosisongpyun industry in Yeonggwang County is finally proposed as follows; First, hardware is composed with the necessary unit facilities such as interpretive center, learning and experience room, library, etc. And the integrating facilities such as Mosisongpyun theme park, traditional village, and knowledge industrialization support center are proposed. Second, software is composed with the necessary unit softwares such as the preservation manual of traditional knowledge and skill, web-site administrator, development of graded textbooks, development database software, etc. And the integrating softwares such as development of innovation and management ability in Mosisongpyun industry are proposed. Third, humanware is composed with the necessary unit programs such as exhibition, own training program, incubator support system, etc. And the integrating programs such as the farm association corporation, the testing and research institute, the institution of learning and training are proposed.

• 한국식품조리과학회지
• /
• 제28권1호
• /
• pp.57-66
• /
• 2012

This study was carried out to investigate the effect of nutritional knowledge on food habits of male employees in Korea. A questionnaire was developed and distributed to 265 male employees of Seoul and Kyunggi area in Korea. The data were analyzed by t-test and ANOVA using SPSS (ver 12.0). Regarding the general aspects of subjects, the highest percent of ages were between the age 21-30 year old. Most respondents were graduates from a university. About twenty percent of male employees' average income was 1-2 million won per month. Most of their families were nuclear families. Eighty three percent of the respondents did not experience any education on nutrition and obtained food and nutritional information from television and internet. The respondents had a high level of perceived knowledge (86.2%); yet, the accuracy of knowledge was lower than the perceived knowledge (72.31%). Regarding the nutritional knowledge, single groups showed a lower score than married groups and groups living with family. Higher nutritional knowledge correlated with higher educational levels, among man in their twenties and thirties. With regards to their eating habits, the frequency of food intake within a weekly period was significantly different; a large percentage of respondents had high frequencies of instant food, alcohol consumption, and smoking. The higher scores regarding dietary habits were for age groups ranging from 41-60 year old, married individuals, nuclear family groups and educational groups with university degrees. Based on the results of this study, male employees have problem concerning food habits in that they are unbalanced and have a tendency to skip meals. Therefore, for the improvement of nutritional status and eating behavior of male employees, the importance of nutrition needs to be emphasized with proper nutritional education programs.

• 전기학회논문지
• /
• 제66권4호
• /
• pp.605-612
• /
• 2017

One of the biggest environmental issues that our world has been facing is climate change. In order to cope with such environmental issues, the world is putting a great deal of effort into energy conservation. The building sector, in particular, consumes 36% of the energy consumed worldwide and emits considerable amount of greenhouse gases. Therefore, introduction of renewable energies in the building sector is highly recommended. Renewable energy sources that can be utilized in the building sector include sunlight, solar heat, geothermal heat, fuel cells and wind power. The wind power generation system which converts wind energy into electrical energy has advantages in that wind is an unlimited and pollution-free resource. It is suitable to be connected to existing buildings because many years of operational experience and the enhanced stability of the system have made it possible to downsize the electrical generator. In case of existing buildings, it is necessary to consider the live loads of the buildings to connect the wind power generation system. This paper, through the connection of the wind power generation with existing buildings, promotes reduction of greenhouse gas emissions and energy independence by reducing energy consumption in the building sector. In order to connect the wind power generation system with an exciting building, the live load of the building and the area of the rooftop should be considered. The installable model is selected by comparing the live load of the building and the load of the wind power generation system. The maximum number of the wind turbines that can be installed is obtained by considering the separation distance between the wind turbines within the area of the rooftop. Installations are divided into single installations and multiple installations of two different types of wind turbines. After determining the maximum installable number, the optimal model that can achieve the maximum annual power generation will be selected by comparing the respective total annual amount of the power generation of different models.

• 대한간호학회지
• /
• 제40권5호
• /
• pp.650-661
• /
• 2010

Purpose: Work-related anxiety and depression are frequent work-related mental health problems. In this study the relationship between workplace violence and work-related anxiety and/or depression among Korean employees was evaluated. Methods: Data were obtained from the Korean Working Condition Survey of 2006. Participants were 9,094 Korean workers aged 15-64 yr. Multiple logistic regression using SAS version 9.1 was used. Results: The incidence of work-related anxiety, work-related depression and workplace violence were 4.5%, 3.5%, and 1.8% respectively. When personal and occupational risk factors were adjusted, workplace violence was significantly associated with work-related anxiety and depression (OR for anxiety: 4.07, CI: 2.62-6.34; OR for depression: 4.60, CI: 2.92-7.25). Work-related anxiety was significantly related to type of employment, working period at present workplace, work time, shift work, job demand, and social support from superiors. Factors influencing work-related depression were gender, education, alcohol consumption, company size, type of employment, working period at present workplace, work time, shift work, and job demand. Conclusion: To promote psychological health in workers there is a need to develop work-related anxiety and depression prevention programs and to decrease in workplace violence. In developing these programs, consideration should be given to personal factors, working conditions, and psychosocial working environments.

• 한국분말재료학회지
• /
• 제12권3호
• /
• pp.167-173
• /
• 2005

Production of weakly agglomerated nanopowders with the characteristic size of about 10 nm and a narrow particle size distribution is still a topical problem especially if the matter is an acceptable output (>50 g/hour), a high purity of the final product, and a low (energy consumption. The available experience and literature data show that the most promising approach to production of such powders is the evaporation-condensation method, which has a set of means for heating of the target. From this viewpoint the use of pulsed electron accelerators for production of nanopowders is preferable since they allow a relatively simple adjustment of the energy, the pulse length, and the pulse repetition rate. The use of a pulsed electron accelerator provides the following opportunities: a high-purity product; only the target and the working gas will interact and their purity can be controlled; evaporation products will be removed from the irradiation zone between pulses; as a result, the electron energy will be used more efficiently; adjustment of the particle size distribution and the characteristic size of particles by changing the pulse energy and the irradiated area. Considering the obtained results, we developed a design and made an installation for production of nanopowders, which is based on a hollow-cathode pulsed gas-filled diode. The use of a hollow-cathode gas-filled diode allows producing and utilizing an electron beam in a single chamber. The emission modulation in the hollow cathode will allow forming an electron beam 5 to 100 ms long. This will ensure an exact selection of the beam energy. By now we have completed the design work, manufactured units, equipped the installation, and began putting the installation into operation. A small amount of nanopowders has been produced.

• 한국식생활문화학회지
• /
• 제20권6호
• /
• pp.754-760
• /
• 2005

The purpose of this study was to investigate Chinese university students' in Beijing perception for Korean Kimchi. The results were as follows: A questionnaire was examined on male 145 (45.7%) and female 172 (54.3%) college students of residing in Beijing. Nationality of Kimchi answered Korea 83.3% of all the participants, and have eaten Kimchi was 59.0%. Male purchased commercial Kimchi 39.7%, and female restaurant 44.9% (p< .05). The first answered 'it was taste' 52.1% when commercial Kimchi purchased, and packing size of commercial Kimchi was 50g 50.0%. Among the intake experience have eaten Kimchi was the highest Baechu Kimchi 79.1%, Mu Kimchi 68.4% and Oi Kimchi 63.6%, also preference of Kimchi was Baechu Kimchi 44.3%, Mu Kimchi 29.3% and Oi Kimchi 19.2% in order. After have eaten Kimchi answered good 64.6% (p< .05), Kimchi liked reason were the highest 'refreshing taste' 42.4%, unliked were 'oder (of garlic, ginger and anchovy juice, etc)' and 'too spicy' 33.3%, respectively. Improvement on consumption extention of Kimchi answered 'not too salty' 30.2%, 'not too hot' 28.5% and 'not too strong seasoning' 22.7%. Perception for Kimchi answered the highest mean (3.95) 'Kimchi is a good side dish with cooked rice'.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제37권3호
• /
• pp.241-244
• /
• 2011

Introduction: Intravenous sedation is performed to ensure smooth and safe surgery. Dental anxiety is a reaction to an unknown danger. The Spielberger's state-trait anxiety inventory (STAI) can be used to simultaneously evaluate the levels of state and trait anxiety. State anxiety is defined as subjective feelings of nervousness. This study assessed the presurgical anxiety using STAI and performed intravenous sedation for patients whose level of state anxiety was > stage IV. Based on our clinical experience, it is believed that higher doses of sedatives are needed to induce the desired levels of sedation in patients with a high level of state anxiety. Objectives: This study examined whether the sedative consumption of the patient with a high anxiety level increased. Patients and Methods: Patients with state anxiety scores of ${\geq}$51 were included in Group V, and those with state anxiety scores ranging from 42 to 50 were placed in Group IV. To induce sedation, intravenous access was established, and a bolus dose of 3.0 mg midazolam was administered intravenously. Sedation was maintained by administering a continuous infusion of propofol, which was aimed at achieving an Observer's Assessment of Alertness/Sedation scale of 10-12/20. In this study, midazolam was initially administered when the body movements appeared to occur or the blood pressure increased. This was followed by the administration of higher doses of propofol if low sedation was observed. Results: There were no significant differences in the patient demographics, duration of sedation, and doses of local anaesthetic agents between Groups IV and V. The midazolam dose and mean propofol dose needed to maintain comparable levels of sedation were significantly higher in Group V than in Group IV. Conclusion: In female patients, whose level of preoperative state anxiety is more than Stage V of STAI, a large quantity of sedatives is needed for intravenous sedation.

• Journal of Information Technology Applications and Management
• /
• 제26권3호
• /
• pp.121-134
• /
• 2019

The Fourth Industrial Revolution has differentiated technologies such as artificial intelligence, IoT(Internet of things), big data, and mobile. As the civilization develops more and more, humanity enjoy the cultural activities more than economic activity for the food and shelter. The platform structure based on the advanced information technology of the present will expand the cultural contents area in a variety of ways. Cultural contents respond sensitively to changes in consumer and will be useful experiences of human activities. Therefore, it should be noted again that the contents industry should not be limited to the discussion of the application of the fourth technology, but should be produced with emphasis on useful experiences of human being. In other words, the discussion of human activities around cultural contents should be focused on how to apply beyond the use of fourth industrial technology. Therefore, it is necessary to analyze the basis of the successful storytelling of the planning stage to connect the fourth industrial technology and human useful experience as a method for developing cultural contents, and to build and propose a model as a strategic method. This study analyzes domestic and foreign cases made by using big data among the visual contents which show continuous increase of consumption among culture industry field, and draws success factors and limit points. Next, we extract what is the successful matching factor that influenced consumer 's consciousness, and find out that the structure of culture prototype has been applied in the long history of mankind, and presents it as a storytelling model. Through the above research, this study aims to present a new interpretation and creative activity of cultural contents by presenting a storytelling model as a methodology for connecting creative knowledge, away from the general interpretation of social phenomenon applied with big data.

• 해양환경안전학회지
• /
• 제13권2호
• /
• pp.133-140
• /
• 2007

예로부터 선장은 경험적으로 기상, 선박 제원 상태 및 운항 일정을 고려하여 최적의 항로를 선택하여 항해하여 왔다. 이는 선장의 경험을 바탕으로 해류나 파랑에 대한 기상 예보 정보를 활용하여 최적항로를 결정하는 것으로 아직까지 선상에서 항로 결정을 보조해주는 디지털화한 시스템은 그 사례를 찾아보기 힘들다. 본 논문에서는 선박의 운항 효율성과 안전성의 관점에서 구성된 선상 최적 항로 안전 평가 시스템을 소개한다. 선사와 선장이 요구하는 효율적인 항해를 위해서는 도착예정시간 및 연료소모량을 최소로 하는 최적 항로를 구한다. 이는 선박의 파랑 중 부가저항에 기초를 둔 선속 저하 빚 마력 증가를 고려하여 계산한다. 안전성 관점에서는 3D 판넬법에 기초를 둔 선박의 내항 계산을 본 시스템에서 구현하여 내항 평가를 수행하며, 최종적으로 선박의 항로 안전 계획 및 평가를 위한 보조 수단이다.