• 보건행정학회지
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• 제14권1호
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• pp.1-23
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• 2004

This study was carried out to investigate the activities and job satisfaction of public health doctors in charge of community health programmes. Subjects were 138 public health doctors charged with community health project, registered in the roll of public health doctors, made out by Central Supporting Team for the District Health Work in 2002. Data was obtained from Ninety-six public health doctors. The response rate was 70%. The survey was conducted from March to April in 2003 bye-mail. The items of the questionnaire consisted of general characteristics of participants, understanding of their activities, support system, job satisfaction, and suggestions to improve the system. Collected data was analyzed using PC-SPSS 10.1. Descriptive analysis, t-test, and ANOVA test were used. The results are as follows: Most of the respondents showed a low participation rate in community health services, but they agreed to the importance of their activities and the necessity to modify and improve the system. 70% of the respondents were dissatisfied with their jobs. The participation in health planning and programmes of health center, and the degree of acceptance of their opinion from health center workers were significantly related to their job satisfaction. The participation rate of the public health doctors having specialty, in community health services is higher than that of the others. In terms of the supports for system operation, the reflection of one's intention in job arrangement process, education and public relation of this system, and the administrative and financial supports made significant differences in the job satisfaction and the accomplishment of their duty. The respondents hoped that the administrative and financial supports for public health doctors in charge of community health programmes should be reinforced to motivate them. They also wanted that they could keep from being overloaded with clinical services. They favored to conduct home visit, community diagnosis, health planning, and health promotion programs as their appropriate activities. From these results, we suggest some strategies to motivate and empower the public health doctors in charge of community health programmes.

• 한국항행학회논문지
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• 제22권2호
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• pp.111-122
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• 2018

현재 우리나라를 포함한 다수의 국가에서 지상 교통수송 체계가 포화상태에 이르렀다. 이를 해결하기 위해 교통체계의 3차원 화로 교통체증을 완화하고 door-to-door 이동성을 달성하고자 도로주행형 개인용 항공기 (PAV; personal air vehicle)에 관한 많은 연구가 진행되고 있다. 본 연구에서는 도로주행형 PAV의 사이징에서 지상 활주거리, 상승률, 최대 순항속도, 최대 상승고도, 실속 속도 등의 구속조건하에서 주요 설계 변수인 추력대중량비, 익면하중, 동력대중량비를 구하기 위한 구속조건 해석을 수행하였다. 또한 사이징 과정에서 국내 환경과 일반항공기급 인증기준인 FAR PART 23을 고려한 임무형상에 대하여 추력대중량비, 익면하중, 동력대중량비, 그리고 제동마력의 그래프를 통해서 설계점을 결정하는 연구도 수행하였다.

• 품질경영학회지
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• 제49권3호
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• pp.245-254
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• 2021

Purpose: In order to accurately reach an underwater projectile to a target point, reliable INS and accurate arrangement of INS between master and slave INS is paramount. Unlike terrestrial and aerial environments, underwater projectile will operates in a restricted environment where location information cannot be received or sent through satellites. In this report, we review the factors affecting the transfer alignment of master and slave INS, as well as how to improve the positional error between INS through improved transfer alignment algorithms. Methods: In this work, we propose an improvement algorithm and verify it through simulation and driving test. The simulation confirmed the difference in the transfer alignment azimuth by fitting the MINS and SINS indoors, displacement in posture, and the process of transfer alignment between MINS and SINS through a driving test to confirm algorithm can improve the arrangement. Results: According to this study, reason for the error in the transfer alignment between MINS/SINS is the factors of the system where movements such as roll, pitch, yaw are not inter locked in real time due to the delay in transmit/receive system. And confirm that the improved algorithm has a desirable effect on accuracy. Conclusion: Through this work, it is possible to identify ways to improve the accuracy of underwater projectiles to reach their target points under various underwater environments and launch condition.

• 한국표면공학회지
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• 제30권4호
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• pp.272-280
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• 1997

The Thermal Barrier Coation(TBC) to improve the that barrier and wear resistant propenrty in high temperature ofthe aircraftength between the accumlation of the aircraft engine and the automobile engine has usually the two layer structure. One is a creamic top layer for heat insulation and the other is a metal bond layer to facilitate the bond strength between the top ceramic layer and the substrate. But, the coated layers should be peeled off because of the accumulation of the thermal stress by the differance of the thermal expantion coefficient between metal and ceramics in a hrat cyclic environment. In this study, the intermediate layer by plasm spray process was introduced to reduce the thermal stress. The powders of plasm spray coating were the Yttria Stabilized Zirconia (YSZ), the Magnesia Stabillized Zirconia(MSZ) and NiCrAlY. the intermediate layer was sprayed with the powders of the bond cast for the purpose of test were executed. The high temperature wear resistance tends to decreasnceee wear and thermal shock test were exeucuted. The high temperature were resistance of the YSZ TBC is better that of the MSZ TBC. The wearrsistance tends to decrease accoring to incresing the temperature between $400^{\circ}C$to $600^{\circ}C$. The thermal shock life of the 3 layer TBC with YSZ top casting was the most outstanding thermal shock rsisstasnce. This means that the intermediate layer should play an importnat roll to alleviate the diffrerence of the thermal expansion coef frcients between metallic layer and cermics layer.

• Tribology and Lubricants
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• 제32권3호
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• pp.75-81
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• 2016

Future electronics such as electronic paper and foldable cellphone are required to be flexible and transparent and should have a high performance. In order to fabricate the flexible electronics using flexibility transfer process, techniques for transferring various devices from rigid substrate onto flexible substrate by elastomeric stamp, have been developed. Adhesion between the elastomeric stamp and various devices is crucial for successful transfer process. The adhesion can be controlled by the thickness of the stamp, separation velocity, contact load, and stamp surface treatment. In this study, we fabricated the bump shape stamp consisting of a UV-curable polymer and investigated the effects of curing condition, separation velocity, and contact load on the adhesion characteristics of bumps. The bumps with hemispherical shape were fabricated using a dispensing process, which is one of the ink-jet printing techniques. Curing conditions of the bumps were controlled by the amount of UV irradiation energy. The adhesion characteristics of bumps are evaluated by adhesion test. The results show that the pull-off forces of bumps were increased and decreased as UV irradiation energy increased. For UV irradiation energies of 300 and 500 mJ/cm², the pull-off forces were increased as the separation velocity increased. The pull-off forces also increased with the increase of contact load. In the case of UV irradiation energy above 600 mJ/cm², however, the pull-off forces were not changed. Therefore, we believe that the bump shape stamp can be applied to roll-based transfer process and selective transfer process as an elastomeric stamp.

• 정보처리학회논문지D
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• 제12D권7호
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• pp.1017-1022
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• 2005

소프트웨어의 요구사항 변경은 소프트웨어의 생명주기 전반에 걸쳐 발생한다. 이러한 변경은 소프트웨어의 수정을 요구하며, 소프트웨어 수정시 소프트웨어의 품질과 안정성을 향상시키는 것은 중요한 문제이다. 리팩토링은 소프트웨어의 품질과 안정성을 보장하면서 소프트웨어를 수정하는 기술이다. 따라서 리팩토링의 자동화에 대하여 다양한 연구가 이루어지고 있다. 본 논문에서는 무브 메소드(Move Method)의 적용여부를 결정지을 수 있는 세 가지 요인을 정의하였다. 정의된 요인에 의해 데이터를 샘플 프로그램에서 추출하였고, 추출된 데이터에 이진 로지스틱 회귀분석을 적용하였다. 이진 로지스틱 회귀분석을 통하여 얻은 무브 메소드 적용 여부에 대한 추측결과는 숙련된 프로그래머들의 수동분석 결과와 상당부분 일치하였다 더불어, 각 요인들은 프로그램 내에서 메소드의 위치를 결정하는데 중요하게 작용하며, 메소드의 최적 위치를 결정짓는 기준으로써 사용될 수 있음을 밝혔다.

• Journal of Biosystems Engineering
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• 제28권4호
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• pp.305-314
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• 2003

The ROPS of an agricultural tractor is designed to protect its driver when the tractor overturns. Although the current OECD tests to determine whether the ROPS meets the requirements of the OECD regulation are desirable, they need long time to test. We experimental time and effort by using CAE. We conducted a finite element analysis for the ROPS design of a Dae-Dong tractor cabin in an attempt to reduce the design and manufacturing time. This study shows the interpretative skill using MARC(v.2000) for designing ROPS and difference between the results of testing and FEA. Design process is generally divided into two phases: a concept and a detail design. The concept design uses simple analysis to predict structural behavior, whereas the detail design involves a finite element analysis performed by the results of the concept design. This study focused on the detail design and used Patran(v.2000r2) and MARC(v.2000) of the MSC software corporation. The model consisted of 4812 elements and 4582 nodes. Four tests. specified in the OECD standards, were performed: (1) longitudinal loading test (2) rear crushing test (3) side loading test (4), and front crushing test. Independent analyses were also performed for each test, along with a sequential analysis. When compared, the results of the independent and sequential analyses were found to be similar to the test results.

• 대한지리학회지
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• 제45권1호
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• pp.26-48
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• 2010

최근 정부는 '녹색성장'의 기치 아래 일련의 에너지관련 계획과 전략들을 추진하고자 한다. 이러한 정부의 에너지 정책에 대해 여러 측면에서 비판적 검토가 있었지만 이러한 정책이 추동되는 구조적 배경에 대해서는 제대로 고찰되지 않았다. 이 논문은 현정부의 '녹색성장' 전략과 그 일환으로 추진되는 에너지정책을 신자유주의화과정으로 이해한다. 특히 정부의 에너지 정책은 에너지의 산업화, 시장화, 기술화, 금융화를 기본적 특성으로 하고 있으며 이로 인해 많은 세부 문제들을 유발하고 있다. 이러한 '녹색성장' 전략은 지속가능한 발전 모형과는 거리가 멀고 하비가 신자유주의화의 전형으로 제시한 '탈취에 의한 축적'의 개념으로 해석된다. 정부의 '녹색성장' 전략과 에너지 정책은 환경보전과 경제성장 간 모순 시장 메커니즘과 국가 개입 간 갈등을 중재할 수 있는 시민(사회)의 역할을 부정한다는 점에서 '녹색성장' 전략에 대한 대안은 시민이 참여하는 시민사회 주도형 에너지 정책을 지향해야 할 것이다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 춘계학술대회 논문집
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• pp.59-62
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• 1996

Plasma displays (PDP) as a large area wall-hanging display device are rabidly developed with flat CRT, TPT LCD and etc. Especially, AC Plasma Display Panels(AC PDPs) have the inherent memory function which is effective for large area displays. The memory function in AC PDPs is caused by the accumulation of the electrical charge on the protecting layer formed on the dielectric layer. This MgO protective layer prevents the dielectric layer from sputtering by ion in discharge plasma and also has the additional important roll in lowering the firing voltage due to the large secondary electron emission coefficient). Until now, the MgO Protective layer is mainly formed by E-Beam evaporation. With increasing the panel size, this process is difficult to attain cost reduction, and are not suitable for large quantity of production. To the contrary, the methode of shuttering are easy to apply on mass production and to enlarge the size of the panel and shows the superior adhesion and uniformity of thin film. In this study, we have prepared MgO protective layer on AC PDP Cell by reactive magnetron sputtering and studied the effect of MgO layer on the surface discharge characteristics of ac PDP.

• 한국정보과학회논문지:시스템및이론
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• 제26권7호
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• pp.767-777
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• 1999

인과적 메시지 로깅 기법은 정상프로세스를 역전(roll-back)시키거나 메시지의 저장을 위해 프로세스의 수행을 중단시키지 않는 장점을 지니고 있지만, 메시지의 크기가 지나치게 커진다는 단점을 지니고 있다. 본 논문에서는 인과적 메시지 로깅 기법의 이러한 문제점을 해결하기 위하여 로그 상속의 개념을 정의하고 로그 연혁을 이용하여 로그 비용, 특히 로그 크기 면에서 효율적인 로깅 기법을 제안한다. 또한 이 로깅 알고리즘을 이용하여 복구시 메시지의 수와 크기를 줄여 복구시간을 줄이는 효율적인 복구 알고리즘을 제안하고, 제안한 알고리즘이 메시지 로그 크기 면에서 효율적임을 증명한다. 또 제안한 알고리즘의 성능을 검증하기 위하여 두 가지 종류의 모의 실험을 수행하여 기존의 로깅 프로토콜과 메시지 크기 면에서의 성능을 비교한 결과를 제시하였다.Abstract Causal message logging has many good properties such as nonblocking message logging and no rollback propagation. However, it requires a large amount of information to be piggybacked on each message, which may incur severe performance degradation. This paper presents an efficient causal logging algorithm based on the new message log structure, LogOn, which represents the causal inter-process dependency relation with much smaller overhead compared to the existing algorithms. The proposed algorithm is efficient in the sense that it entails no additional information other than LogOn to be carried in each message, while other existing algorithms require extra information other than the message logs. This paper also presents an efficient recovery algorithm to solve the problem of a large amount of data exchanges during the recovery. To verify the performance of our algorithm, we give an analysis of the algorithm and perform two simulations and compare the log size with other causal logging protocols.