• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.103-103
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• 2017

• Structural Engineering and Mechanics
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• 제12권5호
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• pp.541-558
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• 2001

The design specifications of guard fences in Japan were reexamined and the revised specifications were implemented from April 1999. Because of the huge consumption in time and cost to test the performances of full-scale guard fences in the field, some assumptions are adopted while modifying the design specifications, and numerical analyses are necessary to confirm the impact performance and safety level of new types of steel highway guard fences. In this study, the finite element models are developed for the heavy trucks and steel highway guard fences to reenact their behaviors, and the solution approach is carried out using nonlinear dynamic analysis software of structures in three dimensions (LS-DYNA). The numerical simulation results are compared with the full-scale on-site testing results to verify the proposed analysis procedure. The collision process is simulated and it is also made possible to visualize the movement of the truck and the performances of guard fences. In addition, the energy shift of the truck kinetic energy to the truck and guard fence Internal energy, and the energy absorption of each guard fence component are studied for the development of a new design methodology of steel highway guard fences based on the energy absorption capacity.

• 한국음향학회지
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• 제35권4호
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• pp.288-294
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• 2016

타이어와 휠가드 사이의 공간은 타이어 패턴음의 전달경로가 된다. 본 논문에서는 타이어-휠가드 공간에서 발생하는 음향현상을 음장모드 분석과 휠 가드 표면에서 음압분포 가시화를 통해 규명하였다. 타이어 패턴음 저감을 위해 음향학적 댐퍼 역할을 수행하는 캐비티를 휠가드 표면상에 적용하였다. 실내소음은 2 dB(A) 감소하였는데, 본 연구에서 다룬 소음저감방법은 완성차 단계에서 원가/중량의 증가없이 실내음질을 개선하는 효과적인 방안이 될 것이라고 판단된다.

• 해양환경안전학회지
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• 제20권3호
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• pp.292-295
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• 2014

This paper proposes that the Marine Search & Rescue and Salvage Association of Korea (MARSA) can provide KCG a very positive return on investment; that is, MARSA will save lives and property well over the budget needed from KCG to operate MARSA. To perform this Cost-Benefit Analysis, actual performance data and other figures are taken from the USCG Auxiliary, and these figures are used to project expected possible MARSA results. In this paper, MARSA is projected to provide a 1,493 % return on investment.

• 시큐리티연구
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• 제57호
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• pp.27-55
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• 2018

공동주택경비와 일반경비는 동종 유사한 업무임에도 불구하고 이원적(二元的) 운영과 관리가 이루어지고 있다. 공동주택경비원도 교육에 있어서나 각종 신고의무 등에서 보다 전문적 관리가 필요하다. 특히 민간부문에서 경찰업무의 하나인 경비업무를 하고 있음에도 불구하고 국가 전반의 범죄예방과 치안자원의 상시관리를 담당하고 있는 경찰청의 관리 감독에서 벗어나 있는 현실은 하루속히 개선되어야 한다. '경비업무'는 국민의 생명과 재산을 보호하는 전문적 영역임에도 불구하고 '공동주택관리업무'가 국토교통부 소관업무라는 이유만으로 '공동주택의 관리'라는 범주에서만 관리 운영되고 있다. 이를 "경비업법"으로 통합하여 관리 운영하여야 한다. 비록 "공동주택관리법"상 경비원과 관련된 규정은 지극히 제한적이지만, 주택경비원의 처우개선 관점에서 공동주택경비원과 일반경비원의 통합관리에 관한 논의를 시작하여, "경비업법" 개정 및 "공동주택관리법"상 준용 규정 신설, 경비업법의 확장해석을 통한 아파트 경비업무 공백 방지, 직무중심의 전문교육 법제화의 방식으로 접근하여야 한다.

• 한국건축시공학회지
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• 제2권1호
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• pp.155-162
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• 2002

In this research, I finally came to a conclusion analyzing the connection among managing of each items in management expenses, the size of each complex and stories, and the term of using. (1) In the managing cost regarding to the management manner, although the managing cost of self-governing management is less imposed than the one of commission management, there is slight difference between those Costs. And it is more important to consider the effectiveness of management than to emphasize reduction of management cost. (2) The higher the stories, the higher the managing cost of elevator per the unit area. It Is caused by the fact that the father the distance of the elevator operating, the higher the electric charges. (3) The third of one of total management cost goes to pay the personnel expenses. So I found that the effective management of the expenses is available to reduce management cost. (4) The higher the stones, the lower the cost of personnel expenses including the cleaner cost. (5) The sum of costs assigned in repairment and management increases in proportion to the term of using. The costs assigned in special repairment and management are interacting to each other. (6) To reduce the management cost, we have to cut down the personnel in security guard that occupies one third of total management cost with application to the joint security system and operation of the self-governing guard. Through this process, it will be easy to accomplish the rationalization of contract with an outside order. Because the improvement of management service is not only the responsibility of owner but also the one of dwellers. And it Is imperative to realize the importance of cooperation and trust between the owner and dwellers. And the establishment of effective managing system which has convenience and rationality must be settled without delay.

• 해양환경안전학회지
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• 제1권2호
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• pp.139-144
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• 1995

먼저 이 곳 한국해양대학교에서 캐나다 코스트가드를 소개할 수 있게 되어서 대단히 영광스럽게 생각하며, 지금부터 발표를 시작하겠습니다. 기존의 캐나다 코스트가드(the Canadian Cost Guard :C.C.G)는 운수성에서 수산·해양부로 이관·통합되면서 해양관리의 중요한 위치를 차지하고 있다. 본인은 이 시간에 통합 이 후의 C.C.G가 어떠한 조직으로 구성되어 있으며, 해양관리를 위해서 어떠한 기능을 수행하고 있는지에 대한 내용을 소개하고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권7호
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• pp.3671-3689
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• 2019

Software defined networking brings unique security risks such as control plane saturation attack while enhancing the performance of wireless sensor networks. The attack is a new type of distributed denial of service (DDoS) attack, which is easy to launch. However, it is difficult to detect and hard to defend. In response to this, the attack threat model is discussed firstly, and then a DDoS attack prevention extension, called FuzzyGuard, is proposed. In FuzzyGuard, a control network with both the protection of data flow and the convergence of attack flow is constructed in the data plane by using the idea of independent routing control flow. Then, the attack detection is implemented by fuzzy inference method to output the current security state of the network. Different probabilistic suppression modes are adopted subsequently to deal with the attack flow to cost-effectively reduce the impact of the attack on the network. The prototype is implemented on SDN-WISE and the simulation experiment is carried out. The evaluation results show that FuzzyGuard could effectively protect the normal forwarding of data flow in the attacked state and has a good defensive effect on the control plane saturation attack with lower resource requirements.

• 해양환경안전학회지
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• 제29권7호
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• pp.879-886
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• 2023

해양경찰공무원은 직무를 수행하면서 조직의 목표 뿐만 아니라 개인의 삶과 연결되어 있다. 이에 해양경찰공무원의 직업 소명의식과 직무열의는 중요한 요소이다. 따라서 이 연구는 해양경찰공무원의 발전에 대한 직업소명의식과 직무열의의 관계를 검증하는데 주목적이 있다. 연구의 진행을 위해 해양경찰공무원 136명을 대상으로 연구를 진행하였다. 직업소명의식의 하위변인은 초월적 부름, 목적·의미 존재, 친사회적 지향 동기로 구성되었으며, 직무열의는 활력, 몰두, 헌신으로 구성하였다. 검증 결과 해양경찰공무원이 인식하는 직업소명의식 하위변인인 초월적 부름과 목적·의미 존재는 직무열의의 하위변인 활력, 헌신, 몰두에 정(+)의 영향을 미치는 것으로 나타났다. 그러나 직업소명의식 하위변인 친사회적 지향 동기는 직무열의 하위변인인 활력, 헌신, 몰두에는 영향을 미치지 않는 것으로 나타났다. 분석 결과를 통해 해양경찰 조직의 실무적 시사점을 제안하였다.

• Journal of Communications and Networks
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• 제6권3호
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• pp.245-257
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• 2004

Driven by the growing number of the mobile subscribers, efficient channel resource management plays a key role for provisioning multimedia service in the next generation personal communication systems. To reuse limited channel resources, diminishing the coverage areas of cells seems to be the ultimate solution. Thus, however, causes more handover events. To provide seamless connection environment for mobile terminals and applications, this article presents a novel handover scheme called the intelligent channel reservation (ICR) scheme, which exploits the location prediction technologies to accurately reserve channel resources for handover connections. Considering the fact that each mobile terminal has its individual mobility characteristic, the ICR scheme utilizes a channel reserving notification procedure (CRNP) to collect adequate parameters for predicting the future location of individual mobile terminals. These parameters will be utilized by the handover prediction function to estimate the expected handover blocking rate and the expected number of idle channels. Based on the handover prediction estimations, a cost function for calculating the damages from blocking the handover connections and idling channel resources, and a corresponding algorithm for minimizing the cost function are proposed. In addition, a guard channel decision maker (GCDM) determines the appropriate number of guard channels. The experimental results show that the ICR scheme does reduce the handover-blocking rate while keeping the number of idle channels small.