• KIPS Transactions on Computer and Communication Systems
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• v.5 no.12
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• pp.491-498
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• 2016

Recently leakages of confidential information and internal date have been steadily increasing by using booting technique on portable OS such as Windows PE stored in portable storage devices (USB or CD/DVD etc). This method allows to bypass security software such as USB security or media control solution installed in the target PC, to extract data or insert malicious code by mounting the PC's storage devices after booting up the portable OS. Also this booting method doesn't record a log file such as traces of removable storage devices. Thus it is difficult to identify whether the data are leaked and use trace-back technique. In this paper is to propose method to help facilitate the process of digital forensic investigation or audit of a company by collecting and analyzing BIOS firmware images that record data relating to BIOS settings in flash memory and finding traces of portable storage devices that can be regarded as abnormal events.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.118-118
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• 2017

4대강 사업으로 인하여 장래 치수 및 물부족현상과 가뭄에 대비한 용수 확보를 위해 하도준설과 보의 설치, 중소규모댐 건설, 농업용저수지 증설 등이 진행되었다. 그중 낙동강에는 8개 대형보가 건설되었다. 하지만 보 건설로 인하여 주변 지역 지하수위가 상승하여 주변 농경지나 저지대가 침수될 가능성이 있어 4대강 사업의 문제점의 하나로 지적되어 왔다. 이에 본 연구에서는 낙동강 유역에 건설된 보로 인하여 상승한 하천수위가 보 주변지역에 미치는 영향을 알아보기 위하여 8개보 주변의 연구대상지역을 선정하고 지하수 모델(Visual-MODFLOW)을 이용하여 보 관리수위 및 함양량 변화에 따른 지하수 유동과 지하수 변화를 분석하였다. 각 연구대상지역별 지하수위 변동특성 분석 순서는 보 건설 후(현재상태)에 대하여 정류상태 보정을 실시한 후 보 관리수위 시나리오를 정하고 그에 따른 분기별 함양량을 적용하여 부정류 모의를 실시하였다. 그 결과 각 연구대상지역의 지하수위는 낙동강 하천수위와 비슷하게 형성되는 것으로 평가되었으며, 낙단보의 경우 분기별 지하수위 변화가 0.1m ~ 0.2m로 함양량 변화에 따른 지하수위 변동이 가장 작게 평가되었다. 상주보의 경우 분기별 지하수위 변화가 1.5m ~ 2.1m로 함양량 변화에 따른 지하수위 변동이 가장 큰 것으로 평가되었다. 이러한 지하수위 변화는 하천주변 농가의 재배 작물 수확량 및 품질에 직접적인 영향을 줄 수 있어 농번기인 2분기(4월 ~ 6월)와 4분기(10월 ~ 12월)의 경우 보 관리수위를 주변 재배작물에 따라 운영한다면 보 건설로 인한 주변 지하수위 상승으로 인한 영향을 최소화 할 수 있을 것으로 판단된다. 향후 한강, 금강, 영산강에 건설된 보 주변에 대한 지하수위 변화특성 연구가 필요할 것으로 판단되며 본 연구 결과를 바탕으로 보 관리수위 결정의 기초자료로 활용할 수 있을 것이라 판단 된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.443-443
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• 2018

새만금유역의 동진강유역에 위치한 동진강제수문은 서해 바닷물 역류에 따른 농경지의 염분피해를 예방하고 고부천과 연계된 부안지역의 농업용수 공급을 위해 설치되었다. 동진제수문은 그간 정읍시 신태인읍, 김제시 부량면, 부안군 백산면의 약 770 ha 농경지에 대해 염분피해를 예방하였고 영농과 한발 시에는 부안군 일대 농경지에 농업용수를 공급할 수 있었다. 하지만 새만금 간척사업등 대규모 국토개발로 주변 자연환경이 크게 변화하여 제수문은 염해방지기능을 상실하게 되었고 현재는 농업용수 공급원으로써의 기능만 남아 있다. 현재 동진강제수문은 관개기에 농업용수 취수를 위해 수문을 닫아 본류의 유량을 저류시키고 있으며, 비관개기에도 대부분 제수문을 닫아놓는 형태로 운영되고 있다. 이러한 갑문폐쇄로 인해 하류의 유입유량이 차단되고 상류 체류시간이 증가되어 수질에 영향을 미칠 것으로 사료된다. 농업용수사용을 위해 저류되어있는 유량을 효율적으로 방류한다면, 외부수자원에 의존하지 않고 유역 내에서 자체적으로 새만금호의 유입량을 확보할 수 있을 뿐만 아니라 동진강 하류의 수질개선에도 기여할 것으로 판단된다. 본 연구에서는 동진강제수문의 내용적을 산정하여 용수공급능력을 파악하였고, 새만금유역과 호 내의 복잡한 수체 형상, 유입 및 유출 구조를 반영하는데 적합한 모델을 적용하였다. 재현성이 검토된 모델 결과를 이용하여 새만금호의 유입부인 동진강 하류의 수질을 모의하였으며, 구성한 모형의 결과와 용수공급능력을 바탕으로 동진강제수문에서의 방류조건을 가정하여 모의를 수행하였다. 방류조건별 수질개선효과를 살펴보면, Scenario 3 > Scenario 2 > Scenario 1의 순서로 수질개선율이 크게 나타났다. 동진강제수문에서의 방류량이 증가할수록 하류의 농도가 점차 감소하는 것으로 나타났으며, 이러한 결과는 동진강제수문의 방류량으로 인해 유황이 개선되고 호 내 오염부하농도가 감소하는 것으로 판단된다. 따라서 농업용수 필요량을 제외한 유량을 하류의 환경유지용수로 확보하고 이를 수질관리취약 시기에 탄력적으로 방류하여 정체수역의 수질오염을 감소시키고 목표수질을 만족하도록 운영되어야 할 것으로 판단된다.

• Journal of Digital Convergence
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• v.17 no.6
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• pp.19-25
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• 2019

Recently a number of car sharing studies have been conducted that share vehicles from a consumer perspective. Meanwhile, Japan's MLIT had empirically implemented social experiment and policy for the installation of sharing car in order to make better use of the business forms and rapidly increasing car sharing associated with express bus as a new type of transaction from a sharing economy perspective. Therefore, this study examined the case of connecting with the express bus in Japan and analyzed and discussed the contents at the practical level. In addition, data collected for 229 car sharing users were verified empirically. The multiple liner regression analysis showed that three types of perceived values effect on the usage intention in the order of economic value, time value and psychology value. These findings suggest that car sharing users' perceived values are very important for increasing the degree of satisfaction with usage intention.

• Economic and Environmental Geology
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• v.49 no.6
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• pp.445-458
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• 2016

Most of water curtain cultivation (WCC) area in Korea has been inveterately suffering from the gradual draw-down of groundwater level and related shortage of water resources at the late stage of WCC peak time. To solve this problem, artificial recharge techniques has been recently applied to some WCC area. This study introduces infiltration gallery, which is one of the artificial recharge methods, and tentatively examined the effectiveness of three galleries installed at Sangdae-ri WCC area of Cheongju City. Seven galleries are set up at each empty space between eight vinyl houses in this area and its dimension is designed as 50 cm in each width and height and 300 cm in each length. Installation process was including bed excavation, backfill with gravels and silica sands, and completion of gallery by equipment of piezometer and covering with non-woven cloth. For each B, C, D gallery, 3 types of test including preliminary, four step and one long-term injection were performed. The first preliminary test showed the rough relations between injection rates and water level rise as follows; 20 cm and 30 cm level rise for $33.29{\sim}33.84m^3/d$ and $45.60{\sim}46.99m^3/d$ in B gallery; 0 cm, 16 cm and 33 cm level rise for $21.1m^3/d$, $33.98m^3/d$ and $41.69m^3/d$ in C gallery; 29 cm and 42 cm level rise for $48.10m^3/d$ and $52.23m^3/d$ in D gallery. Afterwards, more quantitative results estimating effectiveness of artificial recharge were reasoned out through stepped and long-term injection tests, which is expected to be employed for estimating water quantity re-injected into the aquifer through these galleries by natural injection over the period of WCC peak time.

• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.344-350
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• 2003

In this paper, we propose a novel sharing method ordering the events occurring between users collaborated with the common telecomputing environment. We realize the sharing method with multimedia data to improve the coworking effect using teleprocessing network. This sharing method advances the efficiency of communicating projects such as remote education, tele-conference, and co-authoring of multimedia contents by offering conveniences of presentation, group authoring, common management, and transient event productions of the users. As for the conventional sharing white board system, all the multimedia contents segments should be authored by the exclusive program, and we cannot use any existing contents or program. Moreover we suffer from the problem that ordering error occurs in the teleprocessing operation because we do not have any line-up technology for the input ordering of commands. Therefore we develop a method of retrieving input and output events from the windows system and the message hooking technology which transmits between programs in the operating system In addition, we realize the allocation technology of the processing results for all sharing users of the distributed computing environment without any error. Our sharing technology should contribute to improve the face-to-face coworking efficiency for multimedia contents authoring, common blackboard system in the area of remote educations, and presentation display in visual conference.

• Journal of Life Science
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• v.20 no.3
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• pp.411-415
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• 2010

Anisakis simplex is one of the parasitic nematodes, and has a complex life cycle in crustaceans, fish, squid or whale. When people eat under-processed or raw fish, it causes anisakidosis and also plays a critical role in inducing serious allergic reactions in humans. However, no web-based database on A. simplex at the level of DNA or protein has been so far reported. In this context, we constructed a web-based database for Anisakis research. To build up the web-based database for Anisakis research, we proceeded with the following measures: First, sequences of order Ascaridida were downloaded and translated into the multifasta format which was stored as database for stand-alone BLAST. Second, all of the nucleotide and EST sequences were clustered and assembled. And EST sequences were translated into amino acid sequences for Nuclear Localization Signal prediction. In addition, we added the vector, E. coli, and repeat sequences into the database to confirm a potential contamination. The web-based database gave us several advantages. Only data that agrees with the nucleotide sequences directly related with the order Ascaridida can be found and retrieved when searching BLAST. It is also very convenient to confirm contamination when making the cDNA or genomic library from Anisakis. Furthermore, BLAST results on the Anisakis sequence information can be quickly accessed. Taken together, the Web-based database on A. simplex will be valuable in developing species specific PCR markers and in studying SNP in A. simplex-related researches in the future.

• The Korean Journal of Archival Studies
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• no.36
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• pp.35-67
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• 2013

As the office of crown properties expanded to financial structure having jurisdiction over various nation's purse in the Great Han Empire, its official document form has been changed. Unlike the early days, they had used official paper stamped with the words 'the Office of Crown Properties' eliminating 'Department of the Royal Household'. Also, the title on stamp of government position changed to 'Recipient of the Official of Crown Properties'. As the office of crown properties expanded as a great financial structure, it has grown in stature as an independent structure, and it was reflected in official document form. Such change was shown in document distribution system. The recipient of report from each district was the First Lord of Department of the Royal Household until 1897; however, the recipients of reports were mostly the office of Crown Properties from 1899. The Office of Crown Properties could not issue an official order before Aug 1899, since then the Office of Crown Properties had issued official orders to each district. However, the Office of Crown Properties could not handle the document in an equal position to the central organization yet. However, from Sep. 1900, the Office of Crown Properties handle the document with district organizations in equal position to the central organization, and a records office had been established in the Office of Crown Properties. Also, the Office of Crown Properties had handled official documents as an independent organization getting out of belonging organization to the department of Royal Household. Since the records office was established in Sep. 1900, the Office of Crown Properties had written receipt book autonomously. Comparing the receipt books in 1901 to the receipt books in 1905 and 1906, receipt numbers had been appeared from the book in 1905 and the organization in charge of the documents was recorded on some documents. Since no receipt book was found in 1902~1904, it is unknown when receipt number had been started indicating on the book. Seeing that the receipt number on the book of 1905 matched with contents on the receipt stamp, the receipt number has started indicating from around July, 1902; the period the receipt stamp has been started to use. Unlike the receipt stamp, the department in charge was indicated on the receipt book. It is because that the Office of Crown Properties changed writing system. Instead of classifying divisions, the Office of Crown Properties recorded in a book by order to receive, provided serial number, and wrote the department on the bottom of receipt book to classify by department in charge. Since establishment of the records office in Sep. 1900, the Office of Crown Properties had confirmed the receipt of document by stamping 'receipt of the Office of Crown Properties' and made receipt books as the office had started handled documents independently. Also, the Office of Crown Properties changed its system integrating division and recording in one book from the intial system classifying the book by division then receipt number and department in charge were indicated on the book. Also, receipt system has stabilized by stamping the receipt date and number on the received document.

• Journal of the Korean earth science society
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• v.32 no.7
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• pp.902-912
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• 2011

The purpose of this study was to investigate the effects of teaching based on analysis of a hierarchy of the concepts associated with astronomical observation as well as each learner's status of knowledge through analytical methods of the knowledge state. A test instrument was developed to measure high school students' concepts associated with astronomical observation before instruction. The learners' psychological hierarchy associated with astronomical observation that the participants possessed showed the order of 'motion of the earth${\rightarrow}$coordinate system${\rightarrow}$astronomical observation (mechanism of the telescope${\rightarrow}$installation of the telescope${\rightarrow}$observation through the telescope)', and so was the hierarchy of teaching (70.6%). The learners' knowledge state that is supposed to be similar each other in the ability of observing celestial bodies was different even through they scored the same on the concept test. There were cases with the knowledge state well-structured and not well-structured, which suggests that differentiated instruction with appropriate teaching-learning prescriptions be prepared. An analysis of the knowledge state can play the role of both preparing individualized learning prescriptions and formative evaluation. In the unit dealing with astronomical observation of Earth ScienceI, teaching according to the psychological hierarchy of learners rather than the order in which the textbook syllabi were presented scored significantly higher (p<0.05) on the level of concept achievements. This result suggests that the teacher can help students achieve more efficient in learning by analyzing the learner's knowledge state and reordering the syllabi of the textbook in teaching the concepts associated with astronomical observation.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.168-168
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• 2017

ICT 융합 스마트팜 내의 환경계측 센서, 영상 및 사양관리 시스템의 증가에도 불구하고 이들 장비에서 확보되는 데이터를 적절히 유효하게 활용하는 기술이 미흡한 실정이다. 돈사의 경우 가축의 복지수준, 성장 변화를 실시간으로 모니터링 및 예측할 수 있는 데이터 분석 및 모델링 기술 확보가 필요하다. 이를 위해선 가축의 생리적 변화 및 행동적 변화를 조기에 감지하고 가축의 복지수준을 실시간으로 감시하고 분석 및 예측 기술이 필요한데 이를 위한 대표적인 정보 통신 공학적 접근법 중에 하나가 Data mining 이다. Data mining에 대한 연구 수행에 필요한 다양한 소프트웨어 중에서 Open source로 제공이 되는 4가지 도구를 비교 분석하였다. 스마트 돈사 내에서 열환경 모델링을 목표로 한 데이터 분석에서 고려해야할 요인으로 데이터 분석 알고리즘 도출 시간, 시각화 기능, 타 라이브러리와 연계 기능 등을 중점 적으로 분석하였다. 선정된 4가지 분석 도구는 1) R(https://cran.r-project.org), 2) OpenCV(http://opencv.org), 3) OpenNN (http://www.opennn.net), 4) Orange(http://orange.biolab.si) 이다. 비교 분석을 수행한 운영체제는 Linux-Ubuntu 16.04.4 LTS(X64)이며, CPU의 클럭속도는 3.6 Ghz, 메모리는 64 Gb를 설치하였다. 개발언어 측면에서 살펴보면 1) R 스크립트, 2) C/C++, Python, Java, 3) C++, 4) C/C++, Python, Cython을 지원하여 C/C++ 언어와 Python 개발 언어가 상대적으로 유리하였다. 데이터 분석 알고리즘의 경우 소스코드 범위에서 라이브러리를 제공하는 경우 Cross-Platform 개발이 가능하여 여러 운영체제에서 개발한 결과를 별도의 Porting 과정을 거치지 않고 사용할 수 있었다. 빌트인 라이브러리 경우 순서대로 R 의 경우 가장 많은 수의 Data mining 알고리즘을 제공하고 있다. 이는 R 운영 환경 자체가 개방형으로 되어 있어 온라인에서 추가되는 새로운 라이브러리를 클라우드를 통하여 공유하기 때문인 것으로 판단되었다. OpenCV의 경우 영상 처리에 강점이 있었으며, OpenNN은 신경망학습과 관련된 라이브러리를 소스코드 레벨에서 공개한 것이 강점이라 할 수 있다. Orage의 경우 라이브러리 집합을 제공하는 것에 중점을 둔 다른 패키지와 달리 시각화 기능 및 망 구성 등 사용자 인터페이스를 통합하여 운영한 것이 강점이라 할 수 있다. 열환경 모델링에 요구되는 시간 복잡도에 대응하기 위한 부가 정보 처리 기술에 대한 연구를 수행하여 스마트팜 열환경 모델링을 실시간으로 구현할 수 있는 방안 연구를 수행할 것이다.