• 한국산업융합학회 논문집
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• 제26권5호
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• pp.825-831
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• 2023

The propellers used for big ships have a large diameter and are very heavy. In order to apply a precise and safe work process to them, it is necessary to use an exclusive turning system. For this reason, various techniques are applied to produce them. However, workers' convenience and safety are not taken into consideration enough at production sites. Conventionally, these propellers are designed to be separated as their turning system is loaded and rotated by empty weight. Therefore, it is necessary to replace such a design. This study tries to find the weaknesses of the design and structure of a conventional propeller turning system for large ships, to verify structure integrity of a structure in structural analysis, and to devise a plan for designing a new type of turning system. In the basic concept design and structural analysis for the turning system used in the propeller finishing process for large ships, this study drew the following conclusions. It was possible to develop the work process of the turning system for the propeller finishing process used for large ships, to obtain the dimensions for exterior design through a basic design. Structural analysis was conducted to find the structure integrity of the turning system. As a result, in the rail installed to transfer a gantry, the maximum stress was about 45MPa, about 5.5 times lower than the yield strength 250MPa. Therefore, the turning system was judged to be safe structurally.

• 한국치위생학회지
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• 제24권1호
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• pp.35-43
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• 2024

Objectives: Previous research on turnover has been conducted from the organization's perspective. However, for the long-term retention of dental hygienists, it is necessary to conduct research from an individual's perspective. The purpose of this study is to examine the impact of achievement motivation on the intention to stay of dental hygienists. Methods: This study conducted an online survey targeting dental hygienists working in dental healthcare institutions, using convenience sampling from September, 2023. The analysis included 152 participants with long-term work experience and 121 participants with shorter work experience. Multiple regression analysis was conducted to identify factors influencing retention intentions (PASW Statistics ver. 23.0, p<0.05). Results: Factors influencing intention to stay for long-term dental hygienists included the number of dental hygienists and achievement motivation (responsibility, challenge, task orientation), with a significant impact (adj. R²=0.317). For shorter-term dental hygienists, achievement motivation (challenge, task orientation) demonstrated a significant impact (adj. R²=0.164). Conclusions: It was observed that intrinsic factors, particularly achievement motivation, had a significant impact on intention to stay. Consequently, exploring strategies to satisfy intrinsic motivation, such as achievement motivation, is deemed necessary.

• 한국산학기술학회논문지
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• 제17권10호
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• pp.678-684
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• 2016

수중사석고르기 장비와 같은 착저형 수중장비를 활용하여 해저면에서 수중 작업을 수행할 경우 해당 장비는 작업경계면을 정확히 인식하고 작업장 내에 자리잡고 있는 것이 중요하다. 이는 장비 전복과 같이 장비 안전사고와 직결될 수 있기 때문이다. 이 때 작업경계면 표식을 위해서는 잠수부의 도움이 필수적인데, 이를 위하여 잠수부가 수중작업을 수행할 때 작업이 용이하면서도 시중에서 쉽게 구할 수 있으며 재료를 선정하는 것이 중요한데 나일론줄을 해저면에 설치하여 작업경계를 표시하도록 하였다. 수중에서 주변 환경을 관찰하기 위하여 소나와 팬틸트를 이용하여 소나시스템을 구성하였으며 이를 이용하여 거리변화에 따른 수중 작업경계면 탐지 여부를 확인하였다. 또한 수중사석고르기 장비에 최종적으로 소나시스템을 설치하고 나일론줄로 표시된 작업경계면에 대한 탐지여부를 검증하였다. 본 연구결과를 활용하여 착저형 수중장비를 이용한 수중작업 시 작업경계면 인식을 수행할 수 있는 방안을 확보하였다. 작업경계면 인식 방안을 활용할 경우 추후에 개발될 수 있는 다양한 종류의 착저형 수중작업 장비의 작업절차에 광범위하게 적용할 수 있을 것으로 판단된다.

• 한국산학기술학회논문지
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• 제20권2호
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• pp.250-258
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• 2019

본 연구의 목적은 일 지역에 위치한 요양병원 간호사들의 근무환경과 관련된 실태를 알아보는 것으로 본 연구의 결과를 통해 요양병원 간호사의 근무환경 개선에 도움이 되고자 한다. 이를 위해 서술적 조사연구가 시행되었다. 현재 광주지역에 위치한 요양병원에서 근무하는 일반 간호사와 수간호사 이상의 간호관리자 포함 179명의 대상자가 임의 표출되었다. 자료수집은 2015년 7월부터 12월까지였다. 구조화된 설문지가 연구 도구로 사용되었고, 이 설문지에는 대상자의 일반적 특성과 병원관련 특성 및 근무환경 특성이 포함되었다. 모든 자료분석은 SPSS 22.0 version을 이용하여 수행되었다. 본 연구결과, 대상자의 73.2%가 개인에 의해 설립된 요양병원에서 근무하고 있었다. 대다수의 대상자들이 요양병원 인증평가를 받았다고 응답하였다. 대상자들이 근무하는 병동 내 간호사 대 간호조무사의 비율은 1:2인 경우가 많았다. 요양병원 간호사들이 한달 동안 받는 평균 휴가 수는 8일이 가장 많았고, 간호사의 평균 연봉은 2,500~3.000만 원이었다. 본 연구의 결과를 근거로 볼 때, 요양병원 간호사에 대한 근무환경은 좋다고 할 수 없는 상황이었다. 따라서 이러한 요양병원의 근무환경에 대해 간호사들이 어떻게 인지하고 있는지를 좀 더 심층적으로 살펴보는 질적연구를 제안한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.229-232
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• 2008

A Neural network classification of human activity data is presented. The data acquisition system involves a tri-axial accelerometer in wireless sensor network environment. The wireless ad-hoc system has the advantage of small size, convenience for wearability and cost effectiveness. The system can further improve the range of user mobility with the inclusion of ad-hoc environment. The classification is based on the frequencies of the involved activities. The most significant Fast Fourier coefficients, of the acceleration of the body movement, are used for classification of the daily activities like, Rest walk and Run. A supervised learning approach is used. The work presents classification accuracy with the available fast batch training algorithms i.e. Levenberg-Marquardt and Resilient back propagation scheme is used for training and calculation of accuracy.

• 유공압시스템학회논문집
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• 제3권3호
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• pp.20-24
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• 2006

Air balancer is a conveyance cargo-handling machine, used in assembly and process lines of car and machining industries. This can lift up an object, the weight of which is from 5 to 200 kg, and moves it to a position. As industrial technologies evolve, it is required to move an object and fit it into a specified position with greater accuracy, rather than performing simple tasks such as lifting objects up and down as conventional ones do. There is also a demand to handle an object with one hand, rather than with two hands,. Through designs of manifold unit for an air balancer function, pilot regulator unit to keep pressure constant, hand unit for an accurate load perception function, and air balancer circuit, this study enables everybody to work it with ease and convenience. Experiments and comparisons were conducted for the performance evaluation of the circuit.

• 대한안전경영과학회지
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• 제10권2호
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• pp.155-162
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• 2008

The ubiquitous, which is developed for human's convenience, uses the concept of situation awareness that communicates with computer and performs a certain work without user's recognition. In order to collect the information of situation, many devices are required. Also, in the condition of ubiquitous middleware, priority is given to effective controls of various devices. There are many devices for collecting the information of situation awareness such as sensor, RFID, etc. Among them, in the use of RFID, the researcher performed the experiment, in which multiple readers were used depending on the necessity of awareness information, and found the problem of intervention between readers occurring when multiple readers are used. The paper handles the problem of intervention causing from using multiple readers and suggests middleware design module using session manager to solve the problem.

• 기본간호학회지
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• 제10권2호
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• pp.145-153
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• 2003

Purpose: Related factors for 24 nursing diagnoses frequently used in the emergency care unit were validated in this study. Method: A convenience sample of 65 registered nurses who had worked for 2 years or more in emergency care units and received instruction on nursing diagnosis was used for the study. The classification of nursing diagnoses was based on NANDA (1996) and validation, on Fehring (1987)'s DCV model. Result: Differences were found between emergency and general care units for related factors for nursing diagnosis. Newly reported related factors were not found for emergency care units. Conclusion: It is helpful for nurses who work in emergency care to be able to apply the nursing diagnosis validated in this study. These findings can be used as the database to provide a nursing diagnosis system appropriate to improving the emergency nursing practice.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1440-1444
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• 2011

Memory-device is one of the auxiliary components of point-switch machine; connecting front-rod and tongue-rail. The right side and left side of memory-device are different from each other. When there would be a derailing accident of rolling stock or motor-car, the memory-device properly bends and protects the internal of point-switch machine. Memory-device is one of the important site maintenance spare parts. Memory-device for each of right and left side should be secured so that they can be installed on correct side during an exchange work. This study suggests the development of memory-device with different left and right side and the performance test of it. The study intends to contribute in the convenience improvement of maintenance by improving the unification of memory-device.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1766-1784
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• 2011

In the past, station-area development projects were proceeded for modernizing the station facilities and improving the customer's convenience facilities by attracting private financing. But the site of station-are a development has a limitation that limits of benefits comparing with initial cost and absence of collateral by constructed the national property. For the advancing business value, merchandising facilities were adopted. There were many problems like coming the loss of city development opportunities. Now, station-area developments are considered the station and city plan. so, they are rapidly rised up the life in the station, need of making cultural space, improvement efficiency, combination and connectivity of transportation system and need of journey to Work Distance. Accordingly, this study suggests the station-area development projects by analysis of market conditions and forecast about housing and office that meets the trend of station-area development and secures feasible business value.