• 한국산학기술학회논문지
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• 제17권2호
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• pp.635-641
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• 2016

본 연구는 국외 TOD형 도시개발의 사례를 분석하여 대중교통중심형 도시개발의 특성과 발전전략을 도모함으로서, 국내 도시개발의 미래적 계획방향을 제시하는데 목적을 두고 있다. 연구의 결론은 다음과 같다. 첫째, TOD형 도시개발을 실행 할 수 있는 법 및 제도적 지원이 우선되어야 하며, 특히 밀도완화를 통해 민간의 참여를 유도하기 위한 지자체의 조례개정 등이 수반되어야 한다. 둘째, 자금력이 있는 민간사업자의 참여는 중요하지만 공공의 역할이 축소되어서는 안 되며, 계획과 집행, 운영을 견인하는 정책리더와 부서가 존재하여야 한다. 셋째, 대중교통과 토지이용을 통합하는 도시계획체계가 중요하며, 역세권에서 복합기능의 집중개발이 요구된다. 넷째, 관민의 협력체계를 바탕으로 공공재원을 통한 도시기반시설의 확충이 요구되며, 사업시행시 투자비용에 대한 수익성도 검증되어야 한다.

• Smart Structures and Systems
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• 제26권4호
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• pp.481-493
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• 2020

The negative stiffness spring and inerter are both characterized by the negative stiffness effect in the force-displacement relationship, potentially yielding an amplifying mechanism for dashpot deformation by being incorporated with a series tuning spring. However, resisting forces of the two mechanical elements are dominant in different frequency domains, thus leading to necessary complementarity in terms of vibration control and the amplifying benefit. Inspired by this, this study proposes a Negative Stiffness Inerter System (NSIS) as an earthquake protection system and developed analytical design formulae by fully utilizing its advantageous features. The NSIS is composed of a sub-configuration of a negative stiffness spring and an inerter in parallel, connected to a tuning spring in series. First, closed-form displacement responses are derived for the NSIS structure, and a stability analysis is conducted to limit the feasible domains of NSIS parameters. Then, the dual advantageous features of displacement reduction and the dashpot deformation amplification effect are revealed and clarified in a parametric analysis, stimulating the establishment of a displacement-based optimal design framework, correspondingly yielding the design formulae in analytical form. Finally, a series of examples are illustrated to validate the derived formulae. In this study, it is confirmed that the synergistic incorporation of the negative stiffness spring and the inerter has significant energy dissipation efficiency in a wide frequency band and an enhanced control effect in terms of the displacement and shear force responses. The developed displacement-based design strategy is suitable to utilize the dual benefits of the NSIS, which can be accurately implemented by the analytical design formulae to satisfy the target vibration control with increased energy dissipation efficiency.

• 환경생물
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• 제32권4호
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• pp.327-334
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• 2014

Emission reduction of $CH_4$ (methane gas) from rice paddy soil is a very important measure for climate change mitigation in agricultural sector. In this study, we investigated the changes in crop yield and $CH_4$ emissions in response to application of biochar and fertilizers. The experimental site is located in Hwasung, Kyunggido and experimental design is the split-plot method with three replicates. Treatments included rice straw (RS) and biochar (BC) amendments nested with the conventional NPK fertilizer (NPK) and slow release fertilizer (SRF). Control was also prepared with the soil with the conventional NPK fertilization with no amendment. Measurement of $CH_4$ emission was conducted during the growing season of 2014 using a dynamic chamber method. The results showed that application of rice straw increased daily $CH_4$ emission rate by 15%, while application of biochar reduced daily $CH_4$ emission rate by 38%. When we combined biochar application with slow release fertilizer, $CH_4$ emission was reduced by 45%. Further, the crop yield was also increased in all treatments compared with the control except for the treatment of rice straw application with slow release fertilizer. Overall results imply that biochar amendment to agricultural soil can be an effective strategy to decrease annual $CH_4$ emission with no reduction in crop yield.

• 한국화재소방학회논문지
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• 제30권5호
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• pp.46-53
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• 2016

우리나라 목조문화재는 화재 및 풍수해 등의 재해에 취약하므로 평상시 효과적인 안전 예방 조치와 관리가 반드시 필요하다. 이에 문화재청에서는 목조문화재 508개를 대상으로 재난방재시스템을 구축하였다. 그러나 508개소에 설치된 재난방재시스템을 종합적으로 파악하기는 힘들며, 관련자들의 자료공유는 물론, 각각의 재난방재시스템의 유지 관리가 불가능하였다. 이에 본 연구에서는, 사전예방적 관리의 기초단계로서 구축된 재난방재시스템의 현장조사를 통하여 주요 제원, 수량, 위치에 관한 자료를 한눈에 볼 수 있도록 방재설비 데이터베이스를 구축하였다. 이것은 추후 종합적인 문화재 안전관리를 가능하게 하는 기본적이며 중요한 정보이며, 다음 단계의 문화재 안전관리 시스템을 표상화 할 수 있는 기본 시스템이다.

• 한국항공우주학회지
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• 제46권12호
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• pp.1037-1048
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• 2018

본 연구에서는 다목적실용위성 2호의 폐기시점에 대비하여 국제규정, 수행사례를 분석하였고, 현재 다목적실용위성 2호에 탑재된 추진제를 이용하여 폐기기동 계획을 수립하여 국제규정을 만족하는지 여부를 확인하였다. 분석 결과 45kg의 추진제를 이용하여 위성의 근지점을 300km 낮추는 폐기기동을 수행할 경우 3.6년의 궤도수명을 가지는 것으로 나타났고, 동일한 방식을 적용하여 14.5kg 이상의 추진제를 사용하여 고도를 낮추는 경우 국제규정을 만족할 수 있는 것으로 나타났다. 또한 다목적실용위성 2호의 재진입 생존률 분석을 수행하였고, 그 결과 내열성이 높은 추진제탱크나 반작용 휠의 일부가 생존하여 지상에 낙하하는 것으로 나타났으나 지상피해확률 측면의 국제규정을 충분히 만족하는 것으로 나타났다.

• 농촌계획
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• 제25권1호
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• pp.75-87
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• 2019

As the impacts of climate change have been emerged all the way through society, the potential risks specifically on agricultural water and facilities are recently getting concerned. Evaluating vulnerability of agriculture to climate change on is a time-tested strategy. While a number of researches on the adaption and mitigation of climate change were performed in various aspects for sustainable agricultural production, the vulnerability of management system for agricultural water and infrastructure has not been investigated yet. This study is aimed to clarify the definition of vulnerability to climate change, find the major indicators able to presume the vulnerability, and finally determine the relative importance of the indicators based on the specialist questionnaire survey and its analyses. The lists of indicators for major parts of agricultural water management such as, water use, flood control, reservoir related issues, and pumping and drainage systems are initialized referring to the related precedent studies. The primary survey was conducted in the form of Delphi to complement the list and methods and the main survey was then conducted using AHP(Analytic Hierarchy Process) technique to quantitatively prioritize the indicators. The results derived in this study would be directly adopted in weighting importance of indicators to investigate the indicator-based vulnerability analysis to climate change in agricultural water and infrastructure management.

• 한국기후변화학회지
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• 제8권4호
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• pp.297-303
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• 2017

Considering Japan's Greenhouse Gas (GHG) emissions reduction target for Fiscal Year (FY) 2030, the Joint Crediting Mechanism (JCM) was analyzed in order to estimate its significant contribution to Japan's Nationally Determined Contribution (NDC) and check its availability as a new mechanism to achieve Korea's 2030 mitigation target of 11.3% using carbon credits from international market mechanisms. The total budget for JCM Model Projects (1.2 billion JPY/yr) and JCM REDD+ Model Projects (0.8 billion JPY/yr), which are expected to deliver at least 50% of issued credits to Japan, is estimated about 21.6 billion JPY by the year 2030. This budget is about one third of the purchase of carbon credits from international carbon markets. So far, JCM credits of $378tCO_2-eq$. have been allocated to Japan, which are about 77% of the total issued credit through five-JCM Model Projects implemented from the year 2014. It is expected that Japan will obtain about $0.5MtCO_2-eq$. credits more from 100-ongoing JCM Projects, which are only 1% of Japan's NDC target through JCM credits. With regard to regular issued credits from implemented projects, expected new issued credits from pipeline projects and the less budget for JCM implementation as compared to purchasing carbon credits, JCM credits can be reached a resonable level of Japan's NDC target of $50{\times}100MtCO_2-eq$. through JCM until FY 2030.

• Journal of Information Processing Systems
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• 제15권4호
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• pp.865-889
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• 2019

The need for cyber resilience is increasingly important in our technology-dependent society where computing devices and data have been, and will continue to be, the target of cyber-attackers, particularly advanced persistent threat (APT) and nation-state/sponsored actors. APT and nation-state/sponsored actors tend to be more sophisticated, having access to significantly more resources and time to facilitate their attacks, which in most cases are not financially driven (unlike typical cyber-criminals). For example, such threat actors often utilize a broad range of attack vectors, cyber and/or physical, and constantly evolve their attack tactics. Thus, having up-to-date and detailed information of APT's tactics, techniques, and procedures (TTPs) facilitates the design of effective defense strategies as the focus of this paper. Specifically, we posit the importance of taxonomies in categorizing cyber-attacks. Note, however, that existing information about APT attack campaigns is fragmented across practitioner, government (including intelligence/classified), and academic publications, and existing taxonomies generally have a narrow scope (e.g., to a limited number of APT campaigns). Therefore, in this paper, we leverage the Cyber Kill Chain (CKC) model to "decompose" any complex attack and identify the relevant characteristics of such attacks. We then comprehensively analyze more than 40 APT campaigns disclosed before 2018 to build our taxonomy. Such taxonomy can facilitate incident response and cyber threat hunting by aiding in understanding of the potential attacks to organizations as well as which attacks may surface. In addition, the taxonomy can allow national security and intelligence agencies and businesses to share their analysis of ongoing, sensitive APT campaigns without the need to disclose detailed information about the campaigns. It can also notify future security policies and mitigation strategy formulation.

• 대한건축학회논문집:계획계
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• 제35권6호
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• pp.27-37
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• 2019

This study focused on the possibility of reducing the cooling load through the change of micro climate in the outdoor space during summer season. This study proposes an efficient planning model by comparing the effects of urban heat island mitigation through wind path planning, outdoor space vegetation, and exterior material change by using the basic model of the street-oriented block housing proposed in the previous research by the same author. As a result, the most effective wind path planning strategy in the street-oriented block housing was the change of the air flow through the mass height adjustment. When the tall building masses were staggered and arranged in a balanced manner, the overall wind environment could be improved. The greater the height difference between low and high masses, the better the air flow was shown. It was also important to arrange the building masses so that the inlet of the main wind was open and to allow the external space to connect to the adjacent block to create a continuous flow. The change of outdoor space vegetation and flooring, and the formation of wind paths through the opening of lower part also showed the effect of heat island reduction. In addition, the change of PMV in summer was the biggest influence of shadow by tall building mass. Attention should be paid to the fact that high-albedo exterior materials are adversely affected by multiple reflections in dense street-oriented block housing. The use of albedo of the exterior material showed that it is necessary to pay attention to apply in the high density block housing. This is attributed to the rise of the temperature due to the absorption of energy into the low-albedo flooring, where the high-albedo exterior causes multiple reflections.

• 한국전자통신학회논문지
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• 제17권1호
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• pp.1-12
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• 2022

내부자의 정보 노출 사고가 지속해서 발생하면서, 조직 내부의 정보보안 강화에 대한 요구가 높아지고 있다. 그러나 엄격한 정보보안 정책 및 규칙이 조직원에게 적용될 때 정보보안 스트레스와 저항 행동으로 나타날 수 있다. 본 연구는 내부자의 정보보안 정책의 부정적 행동 원인과 완화 요인을 제시하는 것을 목적으로 한다. 특히, 개인(심리적 권한) 및 조직(공정성 분위기) 요인이 어떻게 상호 영향을 주어 부정적 행동을 완화하는지를 확인하고자 하였다. 연구는 정보보안 정책을 내부자에게 반영하는 조직의 근로자에게 설문하여 표본을 확보했으며, 구조방정식모델링으로 가설검증을 하였다. 분석 결과, 정보보안 관련 심리적 권한이 정책 저항에 미치는 영향을 업무 스트레스가 부분 매개 효과를 가졌으며, 공정성 분위기가 심리적 권한의 영향을 강화하였다. 연구 결과는 내부자의 정보보안 정책 저항 감소를 위한 방향성을 제시하였으므로, 조직 내부의 보안 목표 달성을 위한 전략 수립에 도움을 준다.