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휘발성 유기용제 취급 사업장의 위해성평가 및 위해저감 방안 수립 연구
고광훈(Kwanghoon Ko),김효진(Hyojin Kim),천영우(Youngwoo Chon),황용우(Yongwoo Hwang),이익모(Ikmo Lee),문진영(Jin Young Moon) 한국위험물학회 2019 한국위험물학회지 Vol.7 No.1
Although several studies have reported the detrimental effects of volatile organic solvents, workers of solvent ink manufacturers who are involved in producing them have been producing them in the absence of specific management or regulation due to a lack of cost-effectiveness and risk analysis. With the application of the system of the Chemical management systems, this study selected a total of 5 types of chemicals such as PMAc, CH, BGAc, DMDG and GBL that should be managed. The amount of the emission of air pollutants contained in the selected chemicals. In addition, DNEL of each raw material was calculated with the use of its NOAEL values. Thus, the degree of detrimental effects on humans were evaluated. The result was that the concentration of the emission of BGAc in humans was found to be possibility of the effects of chronic inhalation toxicity. The replacement of a hand pump in the manufacturing process and a canopy hood with a lateral aspiration one were proposed as the essential methods for improving the safety for the reduction.
기업의 지속가능성 평가 대응을 위한 전자제품의 환경성 간이 평가 기법 개발
고광훈 ( Kwanghoon Ko ),안상혁 ( Sanghyuk Ahn ),이상용 ( Sangyong Lee ),김병주 ( Byungju Kim ),황용우 ( Yongwoo Hwang ) 한국전과정평가학회 2019 한국전과정평가학회지 Vol.20 No.1
Recently, the Sustainability Index such as DJSI(Dow Jones Sustainability Index) become more global trend for many electronic companies. In this study, we developed simplified environment assessment tool called by simplified LCA (SLCA) on electronic products and LCI Database in life cycle. Firstly, the environmental assessment categories were found for DJSI requirements such as global warming, mineral depletion, eco toxic, human toxic etc. Also, material database and parts database of life cycle inventory were developed for life cycle assessment. The stage of manufacturing, transportation, usage and disposal were developed for life cycle database. Finally, the SLCA tool was developed logically for environmental assessment based on excel program, in which the informations input on material selection, part weight and usage scenario, etc. The result of environmental assessment at the life cycle could be founded in using this tool. The meaning of this study have better effects of reducing load of evaluation and working time.
고광훈(Kwanghoon Ko),서영민(Youngmin Seo),천영우(Yongwoo Hwang),이익모(Ikmo Lee),황용우(Yongwoo Hwang) 한국위험물학회 2020 한국위험물학회지 Vol.8 No.1
Containers usually are used as the general oversea transportation facilities in global. The fumigation materials such as Methyl bromides and formaldehyde, which would be known to be toxic to human or anima beings, commonly are used to remove harmful insect inner containers. Also, workers in unloading container would be easily exposed to toxic materials at working sites and have been reported to occur the safety accidents which would cause many health and damages of workers. In this study, the experimental analysis would be conducted for container unloading workers" exposure risk to hazardous chemical materials based on the international standard, and the kinds and emitted concentrations of hazardous materials would be analyzed and judged occupational exposed risk for electronics products. The results of this study showed that the fumigation materials would be found for all containers. In some containers, it was showed that formaldehyde was found and over occupational exposure limits(OELs) and showed to be found toluene in low level under OELs. But, the inner containers" formaldehyde and toluene detected in tube test would be founded under OELs in precision analysis, and then worker"s exposure risk showed that it could be very lower. In case of products and packing materials, the concentration of formaldehyde and VOCs(Bezene, Toluene) could be under OELs, and then the worker"s exposure risk showed it could be lower. In the future, it should be set up management procedure to prevent worker in handling containers of domestic, and it will be applicable to analyze worker exposure risk for another industrial products. except of electronics.
고광훈 ( Kwanghoon Ko ) 한국전과정평가학회 2021 한국전과정평가학회지 Vol.22 No.1
최근 ESG(환경, 사회, 지배구조)는 미디어와 기업에 관한 경영관리 기사에서 볼 수 있고, ESG는 선택이 아닌 필수 경영요소로 인식되고 있다, 우선, 파리기후변화 협약, 한국 그린뉴딜 등 국제 친환경 정책이나 협약이 강화되고 있다. 또한, 기업의 친환경 활동이 투자자에게도 중요한 요소로 인식되고 있다. 이에 본 연구는 많은 기업이 재생에너지, 폐자원의 재활용성 향상, 제품 전 과정의 탄소발자국 평가 등 기업의 친환경 경영 전략을 수립하는 데 유용할 것으로 사료된다. 따라서, 기업의 ESG에 대한 친환경 활동이 지속 가능한 발전에 있어 중요하다고 할 수 있다. Recently, the ESG (Environment, Social, Governance) has appeared in the economic management section of the media and company-related articles, and then ESG is recognized as essential, not optional in the management of companies. Firstly, the international regime and eco- friendly policies of many countries, such as Paris Climate Change Accord and Korea green new deal and etc. are being strengthened. Also, this eco-friendly activities of companies are recognized as an important factor in investment to investors. This case study is useful for establishing a eco-friendly management strategy to many companies, such as using renewable energy, enhancing recyclability of disposal products and carbon footprint assessment for life cycle of products. Therefore, for the company’s ESG, it is important that eco-friendly activities should be sustainable.
고광훈 ( Kwanghoon Ko ),임노현 ( Nohhyun Lim ),김홍관 ( Hongkwan Kim ),박지형 ( Jihyung Park ),황용우 ( Yongwoo Hwang ) 한국전과정평가학회 2018 한국전과정평가학회지 Vol.19 No.1
Recently, the management of water resources become more important due to the climate change. The ISO 14046 guideline for estimating water footprint, has been published according to global trend. In this study, we analyzed results of water footprint assessment on an water purifier product in life cycle. The usage of drinking water was a major environmental key factor in the evaluation of the water availability footprint, and the parts consisted of product was caused by environmental key factor in the evaluation of the eutrophication. Also, it was analyzed that the use of drinking water at the use stage and the consumption of electricity were main environmental key factors in the evaluation of the acidification. This results of the water footprint assessment have meanings of considering the water availability footprint and the environmental impact of the water consumption in the life cycle of the water purifier system. It is necessary to simultaneously consider not only water consumption at the stage of use, but also parts of products.
A Practical Intent Fuzzing Tool for Robustness of Inter-Component Communication in Android Apps
( Kwanghoon Choi ),( Myungpil Ko ),( Byeong-mo Chang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.9
This research aims at a new practical Intent fuzzing tool for detecting Intent vulnerabilities of Android apps causing the robustness problem. We proposed two new ideas. First, we designed an Intent specification language to describe the structure of Intent, which makes our Intent fuzz testing tool flexible. Second, we proposed an automatic tally method classifying unique failures. With the two ideas, we implemented an Intent fuzz testing tool called Hwacha, and evaluated it with 50 commercial Android apps. Our tool offers an arbitrary combination of automatic and manual Intent generators with executors such as ADB and JUnit due to the use of the Intent specification language. The automatic tally method excluded almost 80% of duplicate failures in our experiment, reducing efforts of testers very much in review of failures. The tool uncovered more than 400 unique failures including what is unknown so far. We also measured execution time for Intent fuzz testing, which has been rarely reported before. Our tool is practical because the whole procedure of fuzz testing is fully automatic and the tool is applicable to the large number of Android apps with no human intervention.
최광훈 ( Kwanghoon Choi ),박경득 ( Kyeongdeuk Park ),고광만 ( Kwangman Ko ),박희완 ( Heewan Park ),윤종희 ( Jonghee Youn ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1
안드로이드 앱에서 접근할 수 있는 유해 사이트를 프로그램 분석 방법으로 검출하는 방법을 제안한다. 주어진 앱의 바이너리 코드를 자바바이트 코드로 역 컴파일하고 문자열 분석 방법을 적용하여 실행 중 사용 가능한 문자열 집합을 계산한 다음 유해 사이트 URL 문자열이 포함되어 있는지 확인하는 방법이다. 기존에는 앱을 직접 실행해서 특정 URL에 접속하는지 감시하는 동적 모니터링 방법인 반면, 제안한 방법은 앱을 실행할 필요가 없다. 앱스토어 관리에서 주기적으로 유해 앱 여부를 검사하는데 제안한 방법을 활용할 수 있다.
NFC 프로그램 메시지 방식에서 변조 방지와 사용자에 의한 동적 접근 제어 방법
고명필(Myungpil Ko),최광훈(Kwanghoon Choi),임효상(Hyo-Sang Lim) 한국정보과학회 2013 정보과학회 컴퓨팅의 실제 논문지 Vol.19 No.12
표준 NFC 메시지와 호환되는 프로그램 메시지 방식에서 메시지 변조 방지와 사용자에 의한 동적 접근 제어 방법으로 NFC 서비스 보안을 높이는 방법을 제안한다. 이 방법을 안드로이드 모바일 환경에서 구현하고 실험한 결과 상용 NFC 태그 용량의 크기 이내에서 프로그램 메시지를 작성할 수 있고 두 가지 보안 방법을 고려한 NFC 서비스 시간도 사용자 입장에서 기존 NFC 메시지 방식과 큰 차이가 없음을 확인하였다. This paper proposes a method of forgery protection and user’s dynamic access control in NFC standards compliant program messages. We implement this proposal in Android phones to test mobile applicability. The sizes of benchmark program messages are small enough to be stored in stock NFC tags, and the total execution time increased due to employing the two security methods is not noticeable to users in NFC service.
H.264/AVC 표준에서 역트리 구조를 이용하여 고속으로 화면내 모드를 결정하는 방법
고현석(Hyunsuk Ko),유기원(Kiwon Yoo),서정동(Jungdong Seo),손광훈(Kwanghoon Sohn) 한국방송·미디어공학회 2008 방송공학회논문지 Vol.13 No.3
The H.264/AVC standard achieves higher coding efficiency than previous video coding standards with the rate-distortion optimization (RDO) technique which selects the best coding mode and reference frame for each macroblock. As a result, the complexity of the encoder have been significantly increased. In this paper, a fast intra-mode decision algorithm is proposed to reduce the computational load of intra-mode search, which is based on the inverse tree-structure edge prediction algorithm. First, we obtained the dominant edge for each 4×4 block from local edge information, then the RDO process is only performed by the mode which corresponds to dominant edge direction. Then, for the 8×8 (or 16×16) block stage, the dominant edge is calculated from its four 4×4 (or 8×8) blocks' dominant edges without additional calculation and the RDO process is also performed by the mode which is related to dominant edge direction. Experimental results show that proposed scheme can significantly improve the speed of the intra prediction with a negligible loss in the peak signal to noise ratio (PSNR) and a little increase of bits.