• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
• /
• pp.271-275
• /
• 2006

This paper describes the design and realization of full attitude system based on MEMS IMU and GPS carrier phase. The work can be divided into two parts: First, initial heading is determined by using two GPS receivers. And this paper discusses the usage of space geometry conditions to reduce the range of ambiguity search. The method presented in this paper was tested on the static. On the static condition, an accuracy better than 0.06 degrees for heading for 3.48m long baseline has been achieved. Integration of GPS and low cost MEMS IMU are used to realize the real-time heading attitude system. Second, level attitude (pitch and roll) is determined using the method of frequency-velocity for the feedback control. At the same time, the method using the attitude based on MEMS IMU to help determination of the range of ambiguity search is proposed. The results done on the sea show that an alternative means to provide real-time, cost-effective, accurate and reliable attitude information for attitude surveys. Though motivated by a big ships application, the design can be applied to other vehicles.

• 산업노동연구
• /
• 제23권1호
• /
• pp.165-195
• /
• 2017

본 논문은 부조리한 삶의 경계에 선 사람들을 인정투쟁의 관점에서 다룬다. 경계인은 1970년대부터 노동운동에 뛰어 든 사람들이다. 그리고 인정투쟁은 사랑, 권리, 가치부여의 측면에서 사회구성원으로부터 인정받기 위한 투쟁이다. 본 논문은 이들이 인정을 위한 열정으로부터 좌절된 과정을 분석한다. 경계인들은 인정을 위해 민주노조를 건설했고, 진보정당으로 결실을 맺었다. 그런데 부조리한 세상에 맞섰던 사람들은 개혁과 혁명의 경계인에서 무기력과 우울증이라는 갈림길에 있다. 열정이 식고 우울증의 현상이 심화되고 있는 이유는 무엇인가? 본 논문은 혁명을 꿈꾸면서 의인이었던 이들이 인정되지 못하고 여전히 밖에서 경계인이 되고 좌절과 무기력에 있는 핵심적인 이유로 내부와 외부와의 다양한 측면에서 균열을 지적했고 이를 극복하기 위해 균열을 극복하기 위한 소통을 대안으로 제시했다.

• Structural Engineering and Mechanics
• /
• 제55권6호
• /
• pp.1241-1260
• /
• 2015

Any rational approach to define the configuration and size of viscous fluid dampers in a structure should be based on the dynamic properties of the system with the dampers. In this paper we propose an alternative representation of the complex eigenvalues of multi degree of freedom systems with dampers to calculate new equivalent natural frequencies. Analytical expressions for the dynamic properties of a two-story building model with a linear viscous damper in the first floor (i.e. with a non-proportional damping matrix) are derived. The formulas permit to obtain the equivalent damping ratios and equivalent natural frequencies for all the modes as a function of the mass, stiffness and damping coefficient for underdamped and overdamped systems. It is shown that the commonly used formula to define the equivalent natural frequency is not applicable for this type of system and for others where the damping matrix is not proportional to the mass matrix, stiffness matrix or both. Moreover, the new expressions for the equivalent natural frequencies expose a novel phenomenon; the use of viscous fluid dampers can modify the vibration frequencies of the structure. The significance of the new equivalent natural frequencies is expounded by means of a simulated free vibration test. The proposed approach may offer a new perspective to study the effect of viscous dampers on the dynamic properties of a structure.

• Nuclear Engineering and Technology
• /
• 제49권5호
• /
• pp.979-988
• /
• 2017

The feasibility of cooling in a pressurized heavy water reactor after a large break loss-of-coolant accident has been analyzed using Multidimensional Analysis of Reactor Safety-KINS Standard code during the recirculation phase. Through evaluation of sensitivity of the fuel channel temperature to various effective recirculation flow areas, it is determined that proper cooling of the fuel channels in the broken loop is feasible if the effective flow area remains above approximately 70% of the nominal flow area. When the flow area is reduced by more than approximately 25% of the nominal value, however, incipience of boiling is expected, after which the thermal integrity of the fuel channel can be threatened. In addition, if a dramatic reduction of the recirculation flow occurs, excursions and frequent fluctuations of temperature in the fuel channels are likely to be unavoidable, and thus damage to the fuel channels would be anticipated. To resolve this, emergency coolant supply through the newly installed external injection path can be used as one alternative means of cooling, enabling fuel channel integrity to be maintained and permanently preventing severe accident conditions. Thus, the external injection flow required to guarantee fuel channel coolability has been estimated.

• 동아시아경상학회지
• /
• 제9권4호
• /
• pp.81-92
• /
• 2021

Purpose - Work stress environment is expanding alongside the speed of worldwide change and psychological well-being concerns are coming about because pressure over-burden can bring about lost workdays, lower representative usefulness, and high occupation turnover rates. For this reason, this study investigates to provide how practitioners can manage employee work stress using health psychology based on prior studies. Research design, Data, and methodology - Qualitative textual research involves collecting and analyzing various non-numeric data to establish different concepts or opinions in prior literature. That means that the present researcher carried out qualitative research in multiple ways, investigating many kinds of previous textual data, such as prior published peer-reviewed resources and case studies analysis. Result - The results revealed that directed symbolism has been displayed to improve prosperity and tranquility among employees with an assortment of persistent infections. Like diaphragmatic breathing, reflection practices consolidate zeroing in on a particular article or sensation (like breathing) while at the same time separating from other distracters and controlling inward encounters (for example, feelings, musings) through non-critical acknowledgment. Conclusion - This research proposes that intellectual rebuilding or figuring out how to perceive maladaptive musings and change them to reflect more versatile; judicious idea examples can fundamentally further develop temperament, diminish pressure, and reduction negative feelings for employees.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제24권4호
• /
• pp.59-67
• /
• 2018

Purpose: The concept of the Barrier-Free Design has steadily expanded into a basic principle of design, which can provide safe and convenient lives not only limited to the disables, elders, and pregnant women, but also to all members of the society. This is what we now know as the Universal Design. In other words, Barrier-Free Design for all is Architectural Approach of Universal Design. Thus, as a future-oriented alternative to school facilities according to social change, this study suggests basic direction of school building planning and concept of universal design considering school facilities characteristics. Methods: The characteristics of school facilities are understood from the perspective of Universal Design. In addition, a survey is conducted to identify the current state of school facilities. Result: Findings from this study are as follows. First, Universal Design of School Building is an integrated characteristic. Integration is intended to create and manage an integrated environment instead of an individual and one-time approach to installation and maintenance of convenience facilities. Second, It is a flexible characteristic to be sustainable. In other words, they aim to be selectable to respond to change. Third, It is a characteristic of accumulation of outstanding cases. This means that not only individual schools but also entire school spaces will be applied to Universal Design to form a virtuous circle of environment improvement. Implications: The results of this study may serve as a basic concept in the design of school buildings.

• 대한한의학원전학회지
• /
• 제32권3호
• /
• pp.31-45
• /
• 2019

Objectives : This paper aims to suggest alternative interpretations to previous ones of 'Daedong-eo-Hyeobui(大同於協義)' and 'Gakrip-eo-Cheonri(各立於擅利)' in the chapter 'Theories on Nature and Conduct(性命論)' in Donguisusebowon(東醫壽世保元) which have been found to be inadequate. Methods : Previous interpretations were thoroughly examined, then evaluated based on the narrative form and logical probability of the Donguisusebowon(東醫壽世保元). Afterwards, correct interpretations of the contents were suggested based on the context of the chapter 'Theories on Nature and Conduct(性命論).' Results & Conclusions : Of 'Daedong-eo-Hyeobui(大同於協義)', Daedong(大同) should be interpreted as 'to gather largely' instead of 'all the same.' Hyeobui(協義) should be interpreted as 'to submit willingly' and not 'to cooperate to Ui(義).' In the case of 'Gakrip-eo-Cheonri(各立於 擅利)', Gakrip(各立) means for people of same minds to rise against evil individually while Cheonri(擅利) refers to the evil of coveting for gains individually. There are other cases where existing interpretations have been erroneous other than the suggested examples, which prompts thorough re-evaluation of the text.

• 기록학연구
• /
• 제42호
• /
• pp.327-361
• /
• 2014

'특수기록'은 국가 '권력기관'이 생산한 안보 수사 정보 분야 등의 기록을 의미한다. 기록관리법 제정 이후에도 국가기록원은 '특수기록'을 통제하지 못하였다. 그 원인은 복합적이다. 곧 국가아카이브의 낮은 위상으로 인한 통제력 상실, 법제도화의 한계, 비공개기록 이관을 위한 적극적인 조치의 부족 등이다. 그러나 국가 아카이브의 올바른 역할을 위해 권력기관의 핵심기록은 이관되어야 하며, 그것이 가능할 때 민주주의시대 기록문화가 창달될 수 있다. 본고는 이와 같은 문제의식에 따라 특수기록관의 비공개기록 이관문제를 검토하고, 이관 방안을 제시하고자 했다.

• 풍력에너지저널
• /
• 제9권4호
• /
• pp.24-31
• /
• 2018

Wind lidar application is increasing and its calibration method is required to use wind lidar as an alternative to the meteorological mast. A nacelle lidar calibration method is now being discussed in IEC 61400-50-3 (Wind energy generation systems - Part 50-3: Use of nacelle-mounted lidars for wind measurements), and the method is mainly based on the wind lidar beam line of sight (LOS) wind speed calibration suggested by DTU as DTU E-0020 (Calibrating Nacelle Lidars). In this paper, a LOS wind speed calibration method is introduced and a calibration example performed on Jeju island is presented. The results showed a slope of 1.011 and R2 of 0.997, which means that the LOS wind speed is highly correlated with the reference wind speed and is comparable. But LOS wind speed calibration requires a very long time due to its principle and environmental conditions, and a calibration method that can overcome this problem of uncontrollable environments needs to be developed.

• Journal of Microbiology and Biotechnology
• /
• 제31권9호
• /
• pp.1288-1294
• /
• 2021

There are a growing number of reports of hospital-acquired infections caused by pathogenic bacteria, especially methicillin-resistant Staphylococcus aureus (MRSA). Many plant products are now being used as a natural means of exploring antimicrobial agents against different types of human pathogenic bacteria. In this research, we sought to isolate and identify an active molecule from Sedum takesimense that has possible antibacterial activity against various clinical isolates of MRSA. NMR analysis revealed that the structure of the HPLC-purified compound was 1,2,4,6-tetra-O-galloyl-glucose. The minimum inhibitory concentration (MIC) of different extract fractions against numerous pathogenic bacteria was determined, and the actively purified compound has potent antibacterial activity against multidrug-resistant pathogenic bacteria, i.e., MRSA and its clinical isolates. In addition, the combination of the active compound and β-lactam antibiotics (e.g., oxacillin) demonstrated synergistic action against MRSA, with a fractional inhibitory concentration (FIC) index of 0.281. The current research revealed an alternative approach to combating pathogenesis caused by multi-drug resistant bacteria using plant materials. Furthermore, using a combination approach in which the active plant-derived compound is combined with antibiotics has proved to be a successful way of destroying pathogens synergistically.