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Economic Evaluation of IT Investments for Emergency Management
Taeha Kim,Youngjai Lee 한국데이타베이스학회 2008 Journal of information technology applications & m Vol.15 No.3
In an emergency management case, evaluating the economic value of information technology investments is a challenging problem due to the effects of decision making, uncertainty of disasters, and difficulty of measurements. Risk assessment and recovery process, one of the major functions in emergency management, consists of (1) measurement of damages or losses, (2) recovery planning, (3) reporting and approving budgets, (4) auctioning off recovery projects to constructors, and (5) construction for the recovery. Specifically and of our interest, measurement of damages or losses is often a costly and time-consuming process because the wide range of field surveys should be performed by a limited pool of trained agents. Managers, therefore, have to balance accuracy of the field survey against the total time to complete the survey. Using information technologies to support field survey and reporting has great potential to reduce errors and lowers the cost of the process. However, existing cost benefit analysis framework may be problematic to evaluate and justify the IT investment because the cost benefit analysis often include the long-run benefit of IT that is difficult to quantify and overlook the impact of managerial control upon the investment outcomes. Therefore, we present an alternative cost-centric control model that conservatively quantifies all cost savings to replace benefits in cost benefit analysis and incorporate the managerial control. The model provides a framework to examine how managerial decision making and uncertainty of disaster affect the economic value of IT investments. The current project in Emergency Agency in South Korea is introduced as a case to apply the cost-centric control model. Our work helps managers to better evaluate and justify IT-related investment alternatives in emergency management.
TAEHA KIM,김범수 연세대학교 동서문제연구원 2011 Global economic review Vol.40 No.4
This paper proposes a general framework of patent protection which can be applied to most existing theories, and can be used to resolve various issues regarding the protection of information technology (IT)-enabled innovations, especially those involving business methods (BMs) and software. We suggest that one should consider that firms have many strategic choices or mixtures of appropriate combinations of innovations, examine different combinations of menu components rather than focusing on well-explored policies, revise market assumptions to make them more realistic and capture the complexity of policy-strategy assumptions by applying methodologies, such as experiments, system dynamics and intelligent agent theory. The work explores how these innovations are protected using the cases in the East Asian economy and find out that software and BMs are better protected in the nations that enforce strong patent rights.
Hydrolysis of Waste Cooking Oil in Supercritical CO2
Taeha Kim,Younghwan Chu,Md. Sufi Ullah Siddik Bhuyan,Kwan Ju Lee,Myung chul shin,Sungha Hong,Yongchan Seo 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol(MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃,0.4<p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO2 medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.
적대적 생성 신경망을 활용한 과다 노출 영상 복원 방법
김태하(Taeha Kim),양성엽(Seongyeop Yang),강병근(Byeongkeun Kang),이의진(Yeejin Lee) 한국방송·미디어공학회 2021 한국방송공학회 학술발표대회 논문집 Vol.2021 No.6
본 논문에서는 과다 노출된 영상을 영상 간 변환(Image-to-Image Translation)을 위해 설계된 적대적 생성 신경망(Generative Adversarial Network)을 활용하여 복원하는 연구를 수행한다. 과다 노출 복원을 위한 기존의 연구에서 과다 노출 영역 판별, 밝기 회복, 색상 보정 과정을 거치는데, 영상 내 과다 노출 영역을 판별하는 과정에서 임의로 결정하는 파라미터에 의해 복원된 영상 결과가 달라지는 한계점을 극복하기 위해 종단간(End-to-End) 신경망을 학습시켜 과다 노출 영역을 별도의 파라미터 선택과 분할된 과정 없이 한 번에 복원하는 방법을 제안한다. 영상 간 변환 신경망 학습에 필요한 과다 노출 여부로 도메인이 분할된 데이터셋은 게임 소프트웨어를 활용하여 만들어 사용하였다. 본 연구에서는 신경망이 생성한 영상이 실제로 과다 노출 영역을 탐지하여 복원하는 것을 확인하였다. 그리고 과다 노출 영역을 탐지하여 복원하는 과정을 학습 단계별로 확인함으로써 신경망이 실제로 과다 노출 복원 과정을 학습함을 보였다.
김태하(Taeha Kim),신형덕(Hyung-Deok Shin) 한국전략경영학회 2008 전략경영연구 Vol.11 No.3
진입 기업이 진보된 기술을 바탕으로 한 새로운 제품을 출시할 때, 기존 기업은 그에 대향하여 신제품과 유사한 제품을 선보이고 의도적으로 자기시장 잠식을 단행할 수 있다. 본 논문에서는 이익 극대화를 위해 진입 기업과 기존 기업이 동태적으로 경쟁하는 모델을 설정, 기존 기업이 행하는 자기시장 잠식의 의사결정이 두 기업의 균형 가격 및 균형 이익에 어떤 영향을 미치는지 살펴본다. 본 논문의 모델에 의하면 기존 기업은 기존 제품의 가격을 상승시킴으로써 자기시장 잠식을 단행할 때 이익 극대화를 이룰 수 있음을 보여준다. When an entrant firm offers a better quality product based on new technological innovation, incumbent firm may also develop and introduce the similar product, which may cannibalize existing product offering of its own. We setup a duopoly model in which incumbent and entrant firms dynamically compete in their product offering and prices for their own profit maximization. The model allows us to analyze how incumbent's cannibalization strategy influences equilibrium pricing and profits of both firms. In a certain condition, we find that incumbent's profit-maximizing strategy is to raise the price of existing product and thus cannibalize the market share of existing product when the incumbent decides to compete with entrant by producing the similar quality product. In the same context, perhaps interesting finding is that the increased competition of higher quality product offering may paradoxically increase the equilibrium price but generate greater overall profit for the incumbent.
김태해(TaeHae Kim),정승환(SeungHwan Jung),정용화(Yongwha Chung),문대성(Daesung Moon),문기영(Kiyoung Moon) 한국정보보호학회 2005 情報保護學會誌 Vol.15 No.6
21세기를 맞이하면서 정보통신기술의 발전과 인터넷 이용 확산 등으로 사용자 인증이 중요한 문제로 대두되고 있다. 패스워드 또는 PIN(Personal Identification Number)을 이용한 사용자 인증 방법이 현재까지 널리 쓰이고 있으나 타인에게 노출되거나 잊어버리는 등의 문제점이 있다. 이러한 문제를 해결하기 위하여 개인의 고유한 생체정보를 이용한 주요 정보 보호 및 사용자 인증 등의 연구가 활발히 진행되고 있다. 그러나 이러한 생체인식 기술을 대규모 응용에 적용하기 위해서는 생체정보의 안전한 저장/전송/처리 등 생체정보 보호에 대한 연구가 필수적이다. 본 고에서는 디지털 컨텐츠 보호에 사용되는 워터마킹 기법을 이용하여 이러한 생체정보를 보호하려는 경우 발생하는 이슈와 관련 연구 동향을 소개한다.
PrimateDB: Development of Primate Genome DB and Web Service
Woo, Taeha,Shin, Gwangsik,Kang, Taewook,Kim, Byoungchul,Seo, Jungmin,Kim, Sang Soo,Kim, Chang-Bae Korea Genome Organization 2005 Genomics & informatics Vol.3 No.2
The comparative analysis of the human and primate genomes including the chimpanzee can reveal unique types of information impossible to obtain from comparing the human genome with the genomes of other vertebrates. PrimateDB is an open depository server that provides primate genome information for the comparative genome research. The database also provides an easy access to variable information within/between the primate genomes and supports analyzed information, such as annotation and retroelements and phylogeny. The comparative analyses of more primate genomes are also being included as the long-term objective.