• Spatial Information Research
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• 제20권4호
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• pp.83-92
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• 2012

무선 통신 기술 및 GPS(Global Positioning System)등의 발달로 인하여 위치 기반 서비스 (Location-Based Services: LBS)가 크게 발전하는 추세이다. 그러나 위치 기반 서비스를 이용하기 위해 질의 요청자는 자신의 정확한 위치 정보를 위치 기반 서비스 제공자에게 전송해야 한다. 따라서 위치 기반 서비스를 제공하면서 질의 요청자의 위치 정보를 보호하는 것이 중요한 과제이다. 이 문제를 해결하기 위해, 기존 기법은 실제 사용자의 위치를 숨기며 네트워크 사용을 줄일 수 있는 2PASS 기법을 사용하였다. 그러나 이 기법은 실제 사용자 분포를 고려하지 않기 때문에 실제 사용자 위치 보호를 완전히 보장하지 않는다. 따라서 본 논문에서는 K-anonymity를 보장하는 가중치 근접성 그래프 기반 최근접 질의처리 알고리즘을 제안한다. 제안하는 알고리즘은 질의 영역 내 K-anonymity를 보장함으로써 사용자의 위치 정보를 보호할 뿐만 아니라 불필요한 질의 결과 탐색을 줄여 네트워크 효율을 증가시킨다. 마지막으로, 성능평가를 통해 제안하는 기법이 기존 연구에 비해 질의 처리 시간 및 네트워크 효율 측면에서 우수함을 보인다.

• 보건의료산업학회지
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• 제4권1호
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• pp.145-156
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• 2010

The purpose of this study is one of high price medical equipment wished to grasp propriety factor about the MRI introduction, analyzing payability through cost accounting into compensation. It was investigated from January 1 to December 31, 2007 about the MRI of a General Hospital. Expectation availability was 23.2 cases, but actual availability did achievement more than 196.1% with 45.5 items. It is estimated that there are a lot of occurrence cases because great reasons that actual availability increases more than expectation availability is excellent resolving power than a CT, and is device that prefer to reason back that radiation damage is less in person body. The followings show the main results of this study. 1. The MRI was construed in order of cost accounting, wave and personnel expenses 45.4%, administrative expenses 53.0%, and material costs 1.6%. 2. According to CVP (Cost-volume-profit) analysis, BEP (Break Even Point) profit is 173,931,428 won for 11 months, and break even usage number of items are 37.5 cases, and separation usage number of items were confirmed by 1.4 cases. Therefore, was construed that can achieve BEP within 11 months though usage number of items keeps 1.4 items day to create the MRI's hospital operation profit. 3. Estimated limit profitability appears high by 96.7%, exceed fixed charges even if when is non-benefit and when it is benefit consider variable, is judged that the MRI's addition induction helps in hospital management enhancing earning rates.

• 수산해양기술연구
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• 제57권4호
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• pp.292-301
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• 2021

Interviews and boarding surveys were conducted in order to understand the actual usage of octopus pot in the coastal composite fishery in Jeollanam-do. According to the results of the interviews conduced by visiting the areas (Goheung, Yeosu and Wando), the number of octopus pots per nine-ton vessel were 30,000-80,000, and the number of daily usage pots were 7,000-10,000. The number of octopus pots per four-ton vessel was 40,000, and the number of daily usage pots were 4,000. As a result of the survey on two octopus pot fishing boats (9.77-ton and 4.99-ton) in Yeosu area, the daily catch weight of 9-ton class vessel was the minimum of 66.9 kg and the maximum of 159.6 kg. The daily catch weight of the four-ton class fishing vessel was from 31.3 kg to maximum 85.6 kg. The average number of octopus pot used per day in the nine-ton class vessel was 6,821 (the minimum of 6,031 and the maximum of 7,697) and 3,181 (the minimum of 2,282 and the maximum of 3,878) in the four-ton class vessel.

• 한국주거학회논문집
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• 제20권6호
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• pp.39-46
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• 2009

It has been a serious problem to consume the energy of apartment while increasing to use of heating & cooling System because of residence environmental upgrades. Great attention has been shown to the problem of the rental apartment, so there are few reports of energy consumption about the rental apartment in korea. To solve the lack of housing, our country has supplied an enormous volume of apartments, and these days it occupies 75% of our buildings. As apartments occupy most of our housings, the rate of energy usage from them are also high. On this, setting apartment energy reduction as a target, by researching the actual conditions of energy consumption and drawing a basis data, we can apply this as a way of saving energy, rationalization of the scale of energy supply facilities and a standard when planning facilities. To grasp the present condition of energy usage of the urban rental apartment, this research analysed the use of electricity, gas and water monthly and annually of a rental apartment that is located in Daegu. The results showed that in 2003 the electricity usage was 1,198MWh but 1,315MWh in 2007, which means 9% of electricity usage increases every year. The average of water usage was $85,072\;m^2$ per year and typical energy consumption unit was $604.2\;MJ/m^2$ on $74.4\;m^2$ of area and $448.8\;MJ/m^2$ on $105.8\;M^2$. By showing the usage of energy and water of the urban rental apartment, understanding the tendency and preparing an typical energy consumption unit standard through this research, apartments should use energy more efficiently.

• 한국항해학회지
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• 제4권2호
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• pp.7-38
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• 1980

Nowadays researchers attach a great importance to the problems concerned with scientific information in the field of science and engineering. There are some reasons for it, that is, ⅰ) the amount of scientific information increases in proportion to the activities of scientists and engineers, so it is difficult to pick up a real valuable information ⅱ) it becomes more important to use a variety of information in proportion to the spread ofthe branch of science ⅲ) since the medium of scientific information is mostly technical papers, it is very difficult to mechanically transact these papers and to keep all documents and scientific informations for a long time. To cope with these difficult situations, many technical skills have been developed, for example, data-base, automatic information retrieval, micro-film and so on. But there are comparatively few investigation on the matter how the researchers who are users and producers think about the systematization of scientific information usage, so this paper investigates the thought and information needs of researchers, and proposes a basis of a method for systematization of scientific information usage. The author inspects the actual conditions of scientific information, reconsider the method which has been used and investigates the matter of how researchers whose interest is closely related to the study of marine affairs think about problems of scientific information usage by thequestionarie of Fuzzy-DEMATEL method. Also, FSM which is method for structuring hierarchy for the several complex problems on the basis of fuzzy sets theory is adopted as a tool of analysis. We can understand the key problems and make a story to solve the systematization of scientific information usage from the results of the analysis and those results will be directly applicable to construct a new system for scientific information usage.

• 한국가스학회지
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• 제27권3호
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• pp.72-76
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• 2023

도시가스 사용시설 중 은폐배관에 점검구를 대신하여 누출점검용 가스계량기를 사용하는 사례가 증가하고 있다. 이 계량기가 설치되어 있는 일부 세대 중 실제 가스누출이 없는 환경에서 보일러의 특수한 사용 패턴에 따라 누출 알람 경보가 지속적으로 발생되었다. 실제 가스 누출을 감지하는 본연의 기능을 발휘하지 못하는 실정이다. 이러한 문제점에 착안하여 본 연구에서는 보일러의 특수한 가스 사용 패턴에 따라 누출점검용 가스 계량기가 누출 알람을 발생시키는 조건을 분석하고, 실제 가스 누출이 있는 경우에만 계량기에서 알람을 발생 할 수 있는 설정값을 모색해 보았다. 이를 통해 알람의 오작동으로 인한 시민의 가스 사용에 대한 불안감을 해소함과 동시에 누출되고 있는 가스를 포착할 수 있는 계량기 본연의 기능을 수행할 수 있도록 하고자 한다.

• 한국산학기술학회논문지
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• 제20권5호
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• pp.599-604
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• 2019

본 연구에서는 스마트폰 사용자의 사용습관 및 하드웨어 특성이 스마트폰의 기능 수행도에 어떻게 영향을 미치는지를 알아보았다. 특히 스마트폰 기능 요소와 사용습관과의 상관관계를 이해하는데 중점을 두었다. 기능성으로는 전부 11 종류의 기능 요소를 정의하였다. 스마트폰 특성은 하드웨어적 특성 및 사용자 사용습관 특성으로 정하였다. 스마트폰 기능별 실측치를 구하기 위해 전부 80명으로 구성된 평가단을 편성하였다. 평가단은 미리 정의된 11개의 기능 요소들에 대해 각 기능 수행에 실제로 소요되는 시간을 스톱워치를 이용하여 측정하였으며 각 기능 요소별로 5회씩 관측하고 데이터를 수집하였다. 기능 요소별 실측치를 종속변수로, 설문지를 통해 수집한 하드웨어 특성, 사용자의 사용습관 등을 전부 12개의 독립변수로 분류하여 Minitab ver.14를 이용하여 회귀분석을 실시하였다. 전반적으로 볼 때, 스마트폰 사용자의 인구통계학적 특성, 하드웨어 특성은 기능 수행에 크게 영향을 미치지 않았다. 그러나 스마트폰 사용습관과 관련한 변수들은 전체적으로 스마트폰 기능 수행도에 커다란 영향을 미쳤으며 그 결과, 과제 수행 시간이 증가하였다. 단순입력 변수 또는 시청 변수에서는 사용성에 미치는 영향은 비교적 미미했지만, 적극 활용 변수에서는 전화걸기, 전화번호 찾기, 사전 검색을 제외한 모든 과제에서 수행시간이 10% - 30%로 크게 증가하였다. 지금까지 스마트폰의 사용자 인터페이스 방식이 크고 단순한 방식으로 일률적으로 제공되었다면, 사용습관이 다양한 계층은 입력 방식이나 과제 처리 방식에 있어서 좀 더 복잡하고 다양한 형태의 인터페이스 방식이 제공되더라도 충분히 활용할 수 있다고 생각한다.

• 한국디지털건축인테리어학회논문집
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• 제13권4호
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• pp.33-39
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• 2013

As lighting energy consumption in buildings occupies high ratio, technical researches to solve it have been constantly carried out. However, basic studies on light environment performance evaluation is actually deficient and only at a level of a simple illumination monitoring. Thus, this study has suggest a light environment energy performance evaluation based on actual residence environments to allow setting lighting interoperation and user required illumination. Conclusions from the study are as follows: 1) As the performance evaluation suggested by this study has not only derived lighting energy usage as well as monitored simple indoor illumination distribution, it is quantitative and allows derivation of visual results. 2) The performance evaluation suggested by this study allows inputs of user required illumination through the performance evaluation server, which is able to support for performance evaluations for various works and users. 3) This study has verified validity of the performance evaluation method by analyzing results of lighting energy reduction by executing performance evaluation on changes of light shelf that is a natural lighting system through the suggested performance evaluation method. This study is significant from a viewpoint that it has suggested a quantitative performance evaluation method on the basis of actual residence environments. Those researches concerned on the energy performance evaluation should be constantly progressed from an aspect that they are another solution of the energy problems.

• 한국멀티미디어학회논문지
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• 제20권9호
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• pp.1606-1618
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• 2017

The explosion effect of computer graphics Visual Effects(VFX) used in films and animations is an important element that determines the completeness of the film, and its usage is getting extended. The realistic explosion effect of VFX should be made according to observations and analysis of various factors of actual explosion in real world. This experimental research would suggest the efficient production guideline for the technical characteristics of underwater explosion of VFX. For this research process, first, the comparison of actual explosion and VFX explosion effect, classification of actual explosion, and characteristics of underwater explosion effect will be addressed. Second, based on the literature reviews, the four steps of experimental production analysis tool will be derived. Third, the experimental research will be processed in along with technical factors four steps of the underwater explosion effect, (1)realistic creation and emission of fluid, (2)fluid expansion control by water pressure, (3)bubble effect, and (4)motion of bubble & dissipation of fluid. The effective method of fluid simulation production will be verified through experimental studies based on the characteristics of the actual explosion process. This experimental study suggested the VFX production technique is expected to be used as the basic data for related research field.

• Environmental Analysis Health and Toxicology
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• 제27권
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• pp.3.1-3.4
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• 2012

Objectives: The current use of humidifier detergent and its harmful impact on humans has arisen as a societal environmental health issue. Therefore, in this study we aimed to explore the relationship between demo-socio characteristics and humidifier use, as well as the monthly usage changes in pregnant women; thus, we report the actual status of humidifier usage of Korea's pregnant population. Methods: From a birth cohort of a Mothers and Children's Environmental Health (MOCEH) study, 1,144 pregnant women who responded through questionnaires including demo-socio characteristics, obstetric status and household environment including whether they use humidifier and frequency of use were included in this study. Statistical analyses were performed to explore the relationship between maternal characteristics and the relevance of the use of humidifiers was performed using a chi-square test, a t-test and univariate logistic regression analysis. The monthly usage rate was demonstrated in the graph. Results: The humidifier usage rate in pregnant women was 28.2%. The average frequency of humidifier usage was 4.6 days per week, 7.3 hours per day. The usage rate was higher in the multipara group and the above the age of 34 age group than in the primipara and below the age of 34 groups. Seoul showed a higher usage rate than Cheonan and Ulsan and as the education level and income increased, the usage rate of humidifiers among pregnant women also increased. In the monthly trend of usage rate, the winter season showed the highest usage rate of over 45% and the lowest in late summer and beginning of fall with a value of 12% or less. Conclusions: During pregnancy, the mother's body is especially vulnerable to hazardous environmental exposure that not only affects the pregnant woman but also the fetus. Further research is still needed to elucidate the route and effect of environmental risk factors. Therefore, based on precautionary and preventive principles, special interest and caution in harmful environments are strongly needed not only at an individual level but also at a national level.