• 지질공학
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• 제20권2호
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• pp.137-146
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• 2010

강우시 침투량 산정을 위하여 일반적으로 기존의 침투능 산정식인 Horton 공식 및 Green-Ampt 공식으로 지반 내 침투능을 산정해 왔다. 하지만, 실제 강우로 인한 지반 침투는 연속적으로 침투가 이루어지므로, 이와 같은 불연속적인 침투량 산정공식의 단점을 보완하고자 연속적인 침투능 산정공식을 새로이 유도하여, 침투능 및 침투량을 비교 분석하고자 하였다. 유도된 식 및 기존의 침투공식을 검증하기 위한 침투실험을 행하여 각 식의 결과들을 비교 분석하였다. 함수비 혹은 포화도의 함수인 불포화투수계수는 직접적으로 침투능 및 침투량에 영향을 끼치므로, 새로이 유도된 식은 침투과정에 따른 불포화투수계수의 변화를 이용하여 보다 정확한 침투능 및 침투량을 산정하고자 하였으며, 침투로 인한 구조물의 안정 및 지하수 거동을 보다 정확히 해석하기 위한 것이다.

• 항공우주시스템공학회지
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• 제10권4호
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• pp.105-114
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• 2016

국가간의 지역충돌, 영토, 보호, 대테러 그리고 국제 무역 흐름에 직면한 현 세계는 항공기 수출, 부대파견 및 해외 주둔에 연관되어 감항인증 업무가 증가될 수 있다. 주권 국가의 위치와 책임을 최소화하기 위해서 외국 군 당국사이의 감항인증 절차를 확립하는 것은 중요하다. 이 연구는 항공기 개발 및 운영을 위한 비행 안전을 확보하기 위한 인정 파트너 사이의 군 감항 인정을 연구하였다. 이 논문은 감항 당국의 역할, 감독능력, 생산절차 및 인증의 소개로 미국 및 유럽 군 당국의 인정의제를 분석하였다. 군 당국인정인제를 기본으로, 다른 외국 군당국과 한국군감항당국에 의해 요구되는 규정활동을 감소할 수 있다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2007년도 추계학술발표회
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• pp.35-41
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• 2007

An International Convention on the control of harmful anti-fouling system on ships(AFS Convention) was adopted on 5 October 2001 at Diplomatic Conference in London, and is expected to be presently effectuated with ratification of more than 25-member nations possessing about 25% of total world tonnage. This convention regulates the operation of harmful anti-fouling system and especially prohibits the use of organotin compounds contained in anti-fouling paint. Organotin compounds have a tendency to be easily extracted by specific solvents and have high polarity and low volatility as specific characteristics. This drives us to attempt of going through the process named derivatization that is required in analysis using a gas chromatography(GC). This study was conducted to determine the proper pre-treatment method, ethylation in comparison with hydridization on the analysis of tributyltin in organotin compounds and to verify the application of the method through the experimental analysis practically used anti-fouling paint and painted layer sample of the served ship.

• 산업경영시스템학회지
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• 제39권2호
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• pp.11-18
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• 2016

Product liability (PL), which began enforcement in 2002, refers to the legal responsibility of the manufacturers or sellers (wholesales or retailers) for the property damage or bodily harm caused by their product. With a strong enforcement of the Product Liability (PL) Act, companies are required to structure and operate a response system to defend or prevent product accidents efficiently, but small and medium enterprises (SMEs) are unable to respond more aggressively due to limitation of management resources. In this manner, it is important to develop response strategies for SMEs to efficiently cope with the PL Act. In this paper, the PEST (Political, Economic, Social, and Technological) analysis is performed to reveal the impact of the PL Act on SMEs in macro-economic point of view. To formulate SME's PL response strategy, SWOT analysis is performed to categorize each factors from PEST analysis and AHP is applied to identify the intensities of SWOT factors. The prioritized SWOT factor, results of PEST-SWOT-AHP analysis, are used to formulate SME's PL response strategies. The study results are briefly summarized as follows. To reduce product defects, it is necessary for SMEs to formulate PL response strategies for each phase of the product life cycle by continuously collecting and analyzing PL cases in the same industry or for similar products. In addition, SMEs should invest more technological effort to ensure product safety. Further, SMEs should spread PL awareness to all staff members by training internal PL experts. Moreover, a SME should enroll in PL insurance and spread this information to its customers so that they become aware that the company is proactively conforming to the PL law.

• 한국산업보건학회지
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• 제17권3호
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• pp.212-223
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• 2007

18 Local exhaust ventilation systems in 10 melting companies located in an industrial complex were tested to know the status of maintenance. Test items were fan flowrates, fan static pressures, rotational speeds and differential pressures of bag filters. Only 22% of the tested fans has more than 80% flowrate efficiency. 44% of the fans has lower than 60% efficiency. The performance of the fans are not in a good status. For the fans with lower than 60% efficiency, the analysis shows that the lower flowrate might be caused by the degradation of fan performance. On the other hand, for the fan s with higher than 60% efficiency, the main cause of flowrate reduction might be too much pressure losses due to clogging of filter bags. The degradation of fans usually lead the reduction of hood capture efficiency, resulting in the increase of contaminant concentrations in workplace. To keep fans in good status, self inspections should be periodically conducted. This inspection should include the measurements of flowrate and pressures. The most important thing to be performed is the initial test of local exhaust ventilation system because the initial test data should be used to know the level of system degradation.

• 시큐리티연구
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• 제14호
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• pp.89-108
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• 2007

우리 경찰은 1948년 창경이래 여러 어려움을 겪으며 성장해왔고 현재 경찰조직의 분권화 및 민주화를 통하여 경찰활동 또한 다양하게 발전하고 있다. 그러나 우리의 사회통제체제는 대륙법계를 중심으로 한 국가경찰체제를 바탕으로 하고 있지만 새로운 경찰활동의 도입에 있어서 기본원칙을 충분히 고려하지 않고 각각의 경찰활동만을 중심으로 우리 경찰활동에 접목시키려는 시도를 하고 있다. 사경찰활동의 확대, 지역사회 경찰활동 개념의 도입, 경찰서비스 개념의 도입, 경찰운영에 있어서 민영화 개념의 도입 등이 그 대표적인 예이다. 따라서 본 연구에서는 경찰의 발전과 관련된 각각의 연구와 선행연구 등을 중심으로 경찰개념 및 경찰활동의 변화과정을 살펴보고 이를 바탕으로 현행 경찰활동에 있어서 개별적이고 다양한 변화추세를 어떻게 이해할 것인가를 제시하였다. 경찰의 개념 및 경찰활동 본래의 기본활동 목표인 공공의 안녕과 질서유지는 경찰활동에 있어서 어떠한 다양한 변화가 있더라고 절대 변할 수 없는 것이기 때문이다.

• Journal of Advanced Marine Engineering and Technology
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• 제38권5호
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• pp.589-601
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• 2014

Natural gas hydrate (NGH) is emerging as a new eco-friendly source of energy to replace fossil fuels in the 21st century. It is well known that the Natural Gas Hydrate contains large amount of natural gas about 170 times as much as its volume and it is easy to be stored and transported safely at about $-20^{\circ}C$ under atmospheric pressure due to so called "self-preservation effect". The option of gas transport by gas hydrate pellets carrier has been investigated and developed in various industry and academy. The natural gas hydrate pellet carrier is on major link in a potential gas hydrate process chain, starting with the extraction of natural gas from the reservoir, followed by the production of hydrate pellets and the transportation to an onshore terminal for further processing or marketing. In recent years, Korean project team supported by Korean Government has been working on the development of NGH total systems including novel NGH carrier since 2011. In order to increase the knowledge on the NGH pellet carrier developed and to understand the major hazards that could have significant impact on the safety of the vessel, this paper presents and evaluates the pros and cons of cargo holds, loading and unloading systems through the analysis of current patent technology. Based on the proven and well-known technologies as well as potential measures to mitigate sintering and minimize mechanical stress on the hydrate pellet in the self-preservation state, this study presents the conceptual and basic design for NGH carrier.

• 대한디지털의료영상학회논문지
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• 제11권2호
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• pp.85-92
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• 2009

This study, "The study about performance evaluations of mobile cover for X-ray's diffusion and distribution in mobile radiation" is based on the rules of mobile defense apparatus for radiation producer in 2006. To use the mobile cover for X-ray for diagnosis has been compulsory in common wards except operation rooms, emergency rooms and intensive care units. we have confirmed the effect in arbitrary shielding material after Qualitiy Control was carried out for accuracy in an experiment of mobile photographing equipment. The performance evaluation was conducted with the fabrics of selenium, 0.2 mmPb, 0.1 mmPb and aluminiums. Considering the result, we choosed 0.1 mmPb and attached cover to mobile photographing equipment. We have finished making the cover after drew up the draft to attach cover to mobile photographing equipment through the modeling and the structural analysis. the process of the study is that we assembled the manufactured structures and carried out the practical experiment to take the photograph after attaching the fabric of 0.1 mmPb to mobile photographing equipment. It is need of additional thesises hereafter that we compare the result between the part to improve for safety besides convenience in photographic experiment about clinical radiation and the effect of covering the diffusion in condition attached the cover.

• Tribology and Lubricants
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• 제28권6호
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• pp.265-271
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• 2012

In the preceding Part I study, for improving the unbalance response vibration of a large PRT motor-generator rotor fundamentally by design, a series of design analyses were carried out for bearing improvement by retrofitting from original plain partial journal bearings, applied for operation at a rated speed of 1,800 rpm, to final tilting pad journal bearings. To satisfy evenly key basic lubrication performances such as the minimum lift-off speed and maximum oil-film temperature, a design solution of 5-pad tilting pad journal bearings and maximizing the direct stiffness by about two times has been achieved. In this Part II study, a detailed rotordynamic analysis of the large PRT motor-generator rotor-bearing system will be performed, applying both the original plain partial journal bearings and the retrofitted tilting pad journal bearings, to confirm the effect of rotordynamic vibration improvement after retrofitting. The results show that the rotor unbalance response vibrations with the tilting pad journal bearings are greatly reduced by as much as about one ninth of those with the plain partial journal bearings. In addition, for the tilting pad journal bearings there exist no critical speed up to the rated speed and just one instance of a concerned critical speed around the rated speed, whereas for the plain partial journal bearings there exist one instance of a critical speed up to the rated speed and two instances of concerned critical speeds around the rated speed.

• 의료법학
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• 제15권1호
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• pp.239-262
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• 2014

The conventional medical appraisal which was done in the process of medical lawsuit was requested from the court to the designated hospital and was delivered as a pattern of one question and one answer in each. However, the comprehensiveness of medical appraisal which was pursued, for example, in Korea Medical Dispute Mediation and Arbitration Agency, could be guaranteed in terms of in-depth medical analysis as well as the broader capacity of the causality estimation besides. The comprehensiveness of appraisal would also include how well organized hospital system of medical care is and how well correlated job system among medical staffs, when medical dispute was happened at the hospital. This comprehensiveness will exert a big contribution on making a demonstrative medical care to prevent from the medical dispute and it could achieve the national plan of building the patient safety net which is effective in restoring the worsened quality of contemporary medical service. Therefore, the comprehensiveness of medical appraisal has to be designed to go forward interdisciplinary fused speciality rather than one division of medicine, which is also aiming at the reliable and consistent appraisal with the supreme dignity from one window. In addition to that, the objective and concrete frame of comprehensive appraisal under the computed connection has to be deliberated to make itself possible in collaboration with positive participation of medical community. The comprehensiveness of medical appraisal would serve to expand not only the capacity of speciality but also the ability of influence on a restorative justice, so that it give effect to an increased number of mediation and arbitration rather than medical lawsuit as well as a decreased number of the social cost and social conflict.