• Journal of Information Technology Applications and Management
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• 제13권4호
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• pp.257-271
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• 2006

Recently, flash memories are one of best media to support portable computer's storages in mobile computing environment. The features of non-volatility, low power consumption, and fast access time for read operations are sufficient grounds to support flash memory as major database storage components of portable computers. However, we need to improve traditional Indexing scheme such as B-Tree due to the relatively slow characteristics of flash operation as compared to RAM memory. In order to achieve this goal, we devise a new indexing scheme called F-Tree. F-Tree improves tree operation performance by compressing pointers and keys in tree nodes and rewriting the nodes without a slow erase operation in node insert/delete processes. Based on the results of the performance evaluation, we conclude that F-Tree indexing scheme outperforms the traditional indexing scheme.

• 터널과지하공간
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• 제29권6호
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• pp.394-406
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• 2019

도심지와 하·해저 터널에서는 연약지반 혹은 특수지반(단층대, 복합지반 등)을 조우할 가능성이 높으며, 이러한 조건에서는 TBM의 굴진율이 저하되고 다운타임이 증가하는 등의 문제점이 발생한다. 이러한 문제점들은 지반조사에서 발견되지 않은 불리한 지반조건에 기인하는 경우가 많으며, 굴진 중 수집된 굴진데이터를 근거로 향후 지층조건에 대한 최적의 운용조건을 결정하는 것이 최선이다. 본 연구는 향후 쉴드 TBM을 이용한 터널공사에서 단층대 및 복합지반에서의 효율적인 시공을 위하여 수행되었다. 외국의 사례를 통해 수집된 TBM의 굴진데이터를 활용하여 굴진율과 다운타임 발생 특성을 지층조건에 따라 분석하였다. 추력, 토크, RPM 등 주요 TBM의 기계데이터와 굴진율, 다운타임은 단층대와 복합지반의 특징에 따라 크게 영향을 받는 것을 확인하였고, 그 특징에 대하여 논하였다. 향후 국내외 유사한 지반에서의 TBM 시공 시 유용하게 활용될 수 있을 것으로 기대된다.

• 수산해양기술연구
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• 제54권2호
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• pp.157-163
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• 2018

In the area around Jeju Island, the squid jigging fishery and the hair-tail angling are popular. Therefore, the study on the characteristics of the formation and shift of fishing grounds is very important. We have received and analyzed AIS data of all vessels around Jeju Island from October 16, 2016 to October 16, 2017, and extracted the positions of the fishing vessels with the same operational characteristics as the fishing vessels of their fisheries. The distribution chart of the frequency of fishing vessels appearing in each predefined fishing grid ($1NM{\times}1NM$) was analyzed. So we took a analogy with the monthly shift of fishing grounds. Many fishing vessels appeared in the seas around Jeju Island from November 2016 to January 2017, and the frequency of their appearance was maintained. In November, however, fishing vessels were mostly concentrated in coastal waters. Yet, the density gradually weakened as they moved into January. From February, the frequency itself began to decline, making it the worst in April. The high concentration of fishing vessels in the waters leading from Jeju Island's northwest coast to south coast in November is believed to be related to the yellowtail fishery that are formed annually in the coastal waters off the island of Marado. In May 2017, the appearance frequency of fishing vessels increased and began to show a concentration in coastal waters around Jeju Island. Fishing vessels began to flock in waters northwest of Jeju Island beginning in July and peaked in August, and by September, fishing vessels were moving south along the coast of Jeju Island, weakening the density and spreading out. Between July and August, fishing vessels were concentrated in waters surrounding Jeju Island, which is believed to be related to the operations of fishing vessels for the squid jigging fishery and the hair-tail angling.

• 한국수산과학회지
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• 제41권1호
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• pp.61-67
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• 2008

Acoustic technology is commonly used to estimate the biomass and distribution of fisheries resources in coastal areas and the open ocean. Acoustic surveys were conducted on 24-26 May and 20-21 June, 2005, and 15-18 June and 27-30 July, 2006, near the Tongyoung, Geojae, and Namhae anchovy fishing grounds using a dual beam echo sounder. Information was obtained on the distributions of adult and juvenile anchovy (depth and position). We calculated and compared anchovy biomass using simple summation. In this study, all backscatter was attributed to anchovy. We assumed that the average target strength of anchovy was -70 dB and the average body weight was 3 g in May and June 2005, and that the target strength of anchovy was -65 dB and the average body weight was 5 g for pelagic individuals in July 2006. The anchovy biomass in May 2005 was estimated to be 0.147 million tons using the traditional method, while using the summation method, the estimated anchovy biomass was 0.062 million tons in June 2005, 0.21 million tons in June 2006, and in 0.43 million tons in July 2006.

• 기술혁신학회지
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• 제20권1호
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• pp.81-102
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• 2017

대부분의 중소기업 지원수단은 자금 인력 세제 등에 국한되어 있다. 이에 본 연구는 맞춤형 정보분석 지원을 소개하고, 이 사업이 새로운 중소기업 지원수단이라는 점을 검증한다. 이를 위해 두 검증이 이루어졌다. 먼저 중소기업정책 이론 차원에서, 정보분석 지원의 이론적인 근거를 검토하였다. 정책적으로는 지원수단으로 판단될 수 있는 네 조건을 제시하고, 이 사업이 네 조건을 충족하는 지를 분석하였다. 검증은 K기관이 수년간 시행해 온 사례를 통해 이루어졌고, 검증 역시 이 사업의 결과를 활용하였다. 본 연구는 중소기업의 기술경쟁력이 강조되는 상황에서 기술 및 시장 관련 정보분석 지원이 중소기업 지원수단이 될 수 있다는 점을 확인하여 정책개발 및 집행에 중요한 시사점을 제시한다.

• 한국공간정보시스템학회:학술대회논문집
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• 한국공간정보시스템학회 2005년도 GIS/RS 공동 춘계학술대회
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• pp.351-354
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• 2005

NASA's remote sensing market analysis and forecast projects 3.3 billion dollars in 2005. On the other hand, a market research firm expected that world commercial remote sensing imagery, GIS software, Data, and value-added services will generate 8.3 billion dollar in 2007. It has been widely believed that geo-spatial information and service market is growing rapidly and has a huge potential, but it is not clearly understood where it is now and will be heading in the future. Also, it could be a significant question to answer where the industry in Korea fits the best in the world business trends and where it should be strategically heading to take a large market share. Furthermore, if it could be worth being considered as a Korean strategic industry for the future. Instead of pursuing direct answers to the questions, the author will start reviewing general business practices, major business transactions such as merging and acquisitions (M&A's) and initial public offerings (IPO's), and research on market capitalization and revenue of major companies. Throughout the study, a list of common grounds in the market was uncovered and realized as follows: (1) value-added data matters in geo-spatial information and service market; (2) private sector grows faster; (3) characteristics of multi-national industry; and (4) Dependency on major industry. Based on the findings, the author presents a list of recommendations as conclusions.

• Journal of Contemporary Eastern Asia
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• 제8권2호
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• pp.27-43
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• 2009

A ban on political podcasting during the General Elections 2006 in Singapore was justified by the Singaporean government on the grounds that the new medium had a greater power to influence voters than traditional modes of political discourse. A between-subjects controlled experiment was conducted to test whether podcasts of political speeches had a greater power to influence voters' evaluations of political candidates and likelihood of voting for them than online text-based transcripts of the same speeches. The study also examined whether mere exposure to political speeches online, irrespective of the modality, had an effect on voters' more general political preferences, i.e. the likelihood of support and voting for the opposition. The findings suggest that political podcasts were no more persuasive than text-based websites and that the effects on political preferences, if any, were likely due the exposure to political content online, not because of the nature of the medium. The implications of the findings are discussed.

• 한국문헌정보학회지
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• 제39권3호
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• pp.45-73
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• 2005

이 연구의 목적은 국내 사서직제의 개선방안을 제안하는데 있다. 이를 위하여 5가지의 대안(현행 직제를 유지하되 직급을 상향 조정하는 방안, 사서직렬을 행정직군에서 분리하여 단독직군으로 전환하는 방안, 사서직과 관련 직종을 묶어 독립직군으로 신설하는 방안, 사서직을 학예직군 아래의 연구직렬로 이속시키는 방안, 그리고 복수 직군화하는 방안)을 상정하여 각각의 논거, 장점과 단점, 실현가능성 등을 정밀 분석하였다. 그 결과, 제3안(사서직, 학예직, 기록관리직을 통합한 가칭 '기록문화직군 또는 기록정보직군'의 신설)을 한국 사서직제의 가장 바람직한 대안으로 제안하였다.

• 통상정보연구
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• 제12권1호
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• pp.55-73
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• 2010

The thesis examines new innovation of various aspect to overcome lots of problems which come by when we execute simplification of trade procedure and administration fairly. Practical implications regarding the innovation of electronic trade infrastructure are as follows. First, it will propel the standardization of electronic trade section in the technical side and the construction atmosphere of international authentication system must be created. The work process should be redesigned in order to implement export-import procedures that meet the relevant standards. Second, the improvement of system for electronic process is necessary in the law and institutional aspect. In order to eliminate any obstacles to the trade procedure, clearer legal grounds regarding legitimate controls and minimum necessity must be established. Also, laws should be revised to admit mutual recognition among certification organizations, in lieu of international agreement-based mutual recognition between government. Third, the detailed improvement for the integration of the electronic trade infrastructure will be demanded. Additionally, user-centered quality management protocols should be established via connections with the systems already existing in governmental bodies. Fourth, various trade institution should harmonized and interconnected with other partners through mutual cooperation for standardization of operational system. A system which can monitor and remotely diagnose and resolve system errors should be established to provide tailor-made service and improve operational efficiency. At the same time, it is necessary to build a cooperative system to share information and promote comprehensive management for efficient operation.

• 한국정보시스템학회지:정보시스템연구
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• 제26권4호
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• pp.285-301
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• 2017

Purpose In this paper we verified the reliabilities of healthcare-related information provided by various users on the site of Naver Jisikin, a Korean typical search platform. Based on Q&A contents we validated answers' reliabilities to the asked questions about a lung cancer with the help of professors at a medical school. Design/methodology/approach The content analysis includes that the types of questions are classified into symptom/diagnosis, therapy, prognosis, after-management and so on. The answers contains advice, advertisement, oriental medicine, and religion as well as the above 5 question categories. The validation results of medical evidence about each answer show that only 49% among all answers have medical grounds. Findings We classified the medical grounded answers into three levels; high, medium and low. Among all answers we need to find out the answers including advertisement because the answers can be harmful to patients. We found the method to select the answers containing advertisement contents with the help of text mining research. The selection model presents high performance as 84% classification accuracy.