Fenton산화에 의한 쓰레기 埋立場 浸出水의 處理

김선희,이병대,김세정,이철희 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1

This study was aimed to investigate treatment feasibility of leachate from landfill that was located in Bancheung-Dong Kyungbuk Talsung-Kun. From the analytical results of leachate, high concentration of organic and nonbiodegradable matters was contained. It could not be treated by biological process only thus required a combined treatment able to high rate COD removal efficiency. Two types of Fenton's oxidation were adapted in this study. The first one is pre treatment before biological treatment. The second one is post treatment after biological treatment. Thus, the optimal conditions in both methods were investigated. From the survey of treatment conditions, in case of pre treatment, the optimal condition was ?? 0.1, ?? 27.08, pH 3, temperature 30℃ and reaction time 2 hr. On the other hand, ?? 0.14, ?? 57.42, pH 3, temperature 30℃ and reaction time 1.25 hr was obtained for post treatment as optimal conditions. In the above optimal conditions, high COD removal efficiency was shown in pre and post treatment. Also it can be expected that nonbiodegradable matters are degraded and converted to biodegradable matters.

A Study on Security Methods after Hacking of Encrypted AP in Wireless Network

Se-Hwan Kwon,Dea-Woo Park 한국정보통신학회 2011 2016 INTERNATIONAL CONFERENCE Vol.4 No.1

Hexanoic acid - crown ether system을 이용한 europium과 yttrium의 용매추출효과의 향상

심대선(Dea-Seon Sim),한혜림(Hye-Rim Han),김세미(Se-Mi Kim),김정훈(Jeong-Hoon Kim),김영운(Young-Wun Kim),정노희(Noh-Hee Jeong),강호철(Ho-Cheol Kang) 한국유화학회 2015 한국응용과학기술학회지 Vol.32 No.1

용매추출법에서 희토류 금속을 효과적으로 분리하기 위해 추출제만 사용하는 것이 아니라 crown ether와 같은 첨가제를 이용하는 연구를 하였다. Host-guest 화합물인 macrocyclic ligand는 금속과 착화물을 형성하는데, 이 때 crown ether의 cavity 크기와 비슷한 크기의 금속 이온들과 안정한 착화물을 형성한다. 이전 연구에서 europium과 yttrium을 분리하기 위해 여러 사슬 길이의 지방산 추출제를 이용한 추출실험을 행하였었다. 이를 토대로 분리효율이 좋지 않았던 hexanoic acid에 크기가 다른 crown ether (18-crown-6 ether, 15-crown-5 ether, 12-crown-4 ether)를 첨가하여 분리효과가 증가하는 것을 연구하였다. hexanoic acid의 농도별로 분리효율을 본 후 가장 분리 효율이 좋은 농도에서 crown ether를 종류와 농도를 다르게 하여 첨가하였다. 그 결과 0.05 M hexanoic acid에서 분리능이1.72으로 가장 높게 나타났고, crown ether를 첨가하였을 시 분리능이 0.002 M 15-crown-5 ether에서가장 높게 나왔으며 기존의 분리능보다 2배 이상 더 높았다. 또한 crown ether를 첨가하였을 때 두 금속이 MLR3·3RH의 형태로 추출되는 것도 확인 할 수 있었다. The synergistic solvent extraction of rare earth elements such as europium and yttrium has been investigated by the extractant with crown ether as an additive. Macrocyclic ligand as host-guest compounds form more stable complexes with metal ions which have the similar size of the cavity of crown ether. In our previous study[14] founded that the extraction used fatty acid of the various alkyl chain length. Based on the results of the previous experiment, the synergistic separation effect of two metals investigated that the hexanoic acid had was the worst extraction effect which added a crown ether such as 18-crown-6 ether, 15-crown-5 ether, and 12-crown-4 ether. In this study, the concentrations of hexanoic acid have showed the separation effect, and then the concentrations and kind of crown ether are performed for synergistic extraction at the hexanoic acid concentration of the highest separation effect. As a results, the separation rate is the highest value of 1.72 at 0.05 M hexanoic acid, and 0.002M 15-crown-5 ether is the best value in other concentrations and kind of crown ether, it is about twice of using only hexanoic acid. Moreover, the extraction species of two metals has been founded MLR3·3RH form when added the crown ether.

성토재하에 따른 점토지반의 침하거동

오세욱(Se Wook Oh),정지철(Ji Cheol Jeong),조천희(Cheon Whi Jo),윤대한(Dea Han Yun) 한국지반환경공학회 2003 한국지반환경공학회 학술발표회논문집 Vol.2003 No.-

방송 뉴스 빅데이터 분석의 가능성

박대민(Dea-min, Park),오세욱(Se-Wook, Oh) KBS 공영미디어연구소 2016 방송 문화 연구 Vol.28 No.1

Hacking and Security of Encrypted Access Points in Wireless Network

Kwon, Se-Hwan,Park, Dea-Woo The Korea Institute of Information and Commucation 2012 Journal of information and communication convergen Vol.10 No.2

An increasing number of people who use a smart phone or tablet PC are accessing wireless networks in public facilities including cafes and shopping centers. For example, iPhones and Android Phones have been available since 2010. However, security incidents may occur through all sorts of malicious code infection of users' personal information during the use of an insecure wireless network. In this paper, we will describe the Wi-Fi protected access (WPA) and WPA2 encryption systems used to access a wireless network from a smart phone and tablet PC, and demonstrate the access point (AP) hacking process in a wireless network to which a password is applied on the basis of the analyzed WPA and WPA2 passwords. We will analyze the method of successful AP hacking and propose an approach to enhancing wireless LAN security. This study will contribute to enhancing the security and stability of wireless networks.

산림분야 ESG 평가모델 개발을 위한 국내외 ESG 동향과 전략

안세민 ( Se-min An ),조대혁 ( Dea-hyeok Cho ),류도현 ( Do-hyun Ryu ),최재혁 ( Jae-hyeok Choi ),안기완 ( Ki-wan An ) 한국산림경제학회 2022 산림경제연구 Vol.29 No.2

ESG가 글로벌 메가트렌드이자 새로운 투자 기준으로 부상하고, 산림을 통한 ESG경영이 주목받고 있는 상황에서, 산림분야 ESG 평가모델 개발을 통한 산림 투자 활성화 대응 방안이 필요한 시점이다. 이에 본 연구는 지속가능성과 ESG 관련 개념들에 대해 살펴보고 국내외 ESG 평가기관, 산림분야 기업의 ESG 경영 사례를 검토한 후, SWOT분석을 통해 산림분야 ESG 평가모델 개발 방안을 제시하였다. 그 결과, 첫째, 산림 ESG 가이드라인과 평가 매뉴얼 공시 체계 구축을 제시했다. 둘째, 기업의 환경역량을 강화하는 관점에서 환경(E)영역의 높은 가중치를 조정하는 기초모델 개발 방안을 제시했다. 세 번째, 산림 S/G영역 지표개발이 필요하다 지적하고 그 방안으로 정부 정책과 정합성 확보와 주요 평가공시제도를 참고하는 과정을 제안했다. With ESG emerging as a global mega trend and a new investment standard, and ESG management through forests is drawing attention, it is time to respond to forest investment activation through the development of ESG evaluation models in the forest sector. Therefore, this study examined sustainability and ESG-related concepts, reviewed ESG management cases of domestic and foreign ESG evaluation institutions and forest companies, and suggested a plan to develop an ESG model in the forest through SWOT analysis. As a result, first, the establishment of a disclosure system for forest ESG guidelines and evaluation manuals was proposed. Second, from the perspective of strengthening the company’s (E) capabilities, a model development plan was proposed to adjust the high weight of the (E) area. Third, it was pointed out that the development of indicators in the forest S/G area was necessary, and as a way, a process of securing consistency with government policies and referring to major evaluation disclosure systems was proposed.

해저터널의 차수그라우팅 설계프로그램 개발에 관한 연구

김대영(Kim, Dea Young),이세진(Lee, Se Jin),이희광(Lee, Hee Kwang),정재훈(Jung, Jae Hoon) 대한토목학회 2013 대한토목학회 학술대회 Vol.2013 No.10

선수보증광고가 수영선수의 스포츠용품 구매행동에 미치는 영향

기대위(Gee, Dea-Wi),서희정(Seo, Hee-Jung),박세혁(Park, Se-Hyuk) 한국사회체육학회 2020 한국사회체육학회지 Vol.0 No.80

Purpose: The purpose of this study is to examine the impact of athlete endorsement on brand attitude, purchasing behavior, and recommendation intention for swimming equipments. Method: Respondents were registered swimming athletes in the Korea Swimming Federation, who participated in the 99th National Sport Festival. By using conveneince sampling method, total 406 questionnaires were gathered from the samples and among them 396 valid samples were used for further analyses. The data were recorded and analyzed using the SPSS 25.0 for descriptive analysis, frequency analysis, correlational analysis, and multiple regression analysis. To prove the constructv alidity of the instruments, confirmatory factor analysis was performed. Results: Findings are as follows: First, the trust, specialty, and attractiveness sub-components in the celebrities’ attributes were found to impact significantly and statistically on brand attitude. Second, the brand attitude was found to impact significantly and statistically on purchasing intention. Finally, the brand attitude was found to impact significantly and statistically on recommendation intention. Conclusions: It is clear that the endorsed athletes should be considerate in managing themselves. To maximize the impact of athlete endorsement, it is critical for both athletes and the sponsoring corporate to increase continuously the athletes’ attractiveness, trust, and specialt.y The athletes need to improve their attractiveness as well as performance and outcomes, resulting in their enhancde values and the corporate’s improved endorsement effects.

유무선 VoIP 취약점 분석과 해킹공격 및 보안 연구

권세환,박대우,Kwon, Se-Hwan,Park, Dea-Woo 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.4

최근 VoIP는 IP기반에서 유선과 무선을 이용하여 음성뿐만 아니라 멀티미디어 정보전송을 제공하고 있다. VoIP는 All-IP방식과 Gateway방식과 mVoIP 등이 사용되고 있다. 유무선 VoIP는 네트워크상에서 VoIP 호 제어 신호 및 불법 도청이, 서비스 오용 공격, 서비스 거부 공격의 대상일 뿐만 아니라, WiFi Zone의 무선 인터넷은 무선이 가지고 있는 보안취약점이 존재하다. 따라서 유무선 VoIP에 대한 보안 취약점을 분석하고, 해킹사고에 대한 연구와 보안 대책에 대한 연구가 필요하다. 본 논문에서는 VoIP에 All-IP방식과 Gateway방식의 VoIP시스템과 네트워크에 대한 Scan을 통하여 IP Phone 정보를 획득하고 취약점을 분석한다. 발견된 All-IP방식과 Gateway방식의 VoIP 취약점에 대한 해킹 공격을 실시하여 서비스거부 공격, VoIP 스팸 공격을 실시한다. 그리고 실제 VoIP시스템을 설치 운영하고 있는 현장에서의 조사와 분석을 통해 보안 대책을 제안한다. Recently VoIP has provided voice(both wired and wireless from IP-based) as well as the transmission of multimedia information. VoIP used All-IP type, Gateway type, mVoIP etc. Wired and wireless VoIP has security vulnerabilities that VoIP call control signals, illegal eavesdropping, service misuse attacks, denial of service attack, as well as wireless vulnerabilities etc. from WiFi Zone. Therefore, the analysis of security vulnerabilities in wired and wireless VoIP and hacking incidents on security measures for research and study is needed. In this paper, VoIP (All-IP type, and for Gateway type) for system and network scanning, and, IP Phone to get the information and analysis of the vulnerability. All-IP type and Gateway type discovered about the vulnerability of VoIP hacking attacks (Denial of Service attacks, VoIP spam attacks) is carried out. And that is a real VoIP system installed and operated in the field of security measures through research and analysis is proposed.