• Industry Promotion Research
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• v.5 no.1
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• pp.1-11
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• 2020

The purpose of this study is to analyze the industrial accidents data with survival model. EDA approach is used to explore the relationship between two variables and among three variables for the past 10 years of industrial accidents data. Survival models are also tried. Survival curve drops more rapidly for the business with fewer employees as time goes by. Industrial accidents occur more often as the total number of industrial accidents gets larger and as the number of employees gets smaller. Agriculture, fishing and forestry have a higher level of industrial accidents than construction while service industry and 'transportation·storage and telecommunication' have a fewer number of industrial accidents than construction. Korea Safety and Health Agency's and Ministry of Employment and Labor's involvement were not effective but Civilian's was. Recurrent event data analysis reveals all most the same result as for non-recurrent data analysis.

• Journal of the Korean Society of Fashion and Beauty
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• v.6 no.1
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• pp.39-47
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• 2008

Korean embroidery is the long historical industrial arts of real life and has handed down Korean sentiment up to now. Korean traditional embroidered pattern is designed to wish someone's health and luck, who uses the embroidery on the clothes and the goods in real life. Especially, the ten longevity symbols' design is represented as 10 which means perfection in oriental philosophy, the sun, mountain, cloud, water, crane, rock, turtle, pine tree, the elixir of life and deer; these 10 symbols show how ancient Korean believe and wish perpetual youth. However, fiber material used embroidery relic has difficulty in preserving for long period compared to other relic descended from historical events for long time and their preserved state isn't so good owing to have been used directly in the real life. Therefore, it is essentially embossed to preserve the embroidery relic and pattern, and make DB for the data. With preservation of the pictures about the handicraft, it's necessary to preserve embroidery technique and make DB through digital imagination. Through the process, we can apply Korean embroidery image to cul-duct package and digital image related field, and it will be helpful to make the tradition popular. In this study, through the research for the embroidery technique applied pattern on the embroidery relic of ten longevity symbols, we'll establish the cultural identification of Korean embroidery image and then develop a worldwide Korean image.

• Journal of Korean Society of Disaster and Security
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• v.6 no.1
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• pp.73-78
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• 2013

This study aims to develop Drowning Management Index (DMI) to evaluate the effectiveness of drowning management in a region. In order to develop practical index to evaluate drowning management, downing contributors are examined. Drowning exposure rate is collected by survey. DMI is generated from South Korea and Australia for comparison. South Korea and Australia indicate similar number of drowning per 100 thousand people (1.7 South Korea, 1.4 Australia) but in DMI it turned out 9 times difference between two countries (15.5 South Korea, 1.67 Australia).

• The Korean Journal of Applied Statistics
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• v.23 no.5
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• pp.891-908
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• 2010

In Korea, the small area estimation method is currently unpopular in generating o cial statistics. Because it may be difficult to determine the reliability for small area estimation, although small area estimation ha a sufficiently good advantage to generate small area statistics for Korea. This paper inspects the method of making small area unemployment through the small area estimation method. To estimate small area unemployment we used an EBLUP-type estimator based on a logistic linear mixed model. To evaluate the EBLUP-type estimator we accomplished the real data analysis and simulation experiment from the population and housing census data. In addition, small area estimates are compared to large sample survey estimates. We found the provided method in this paper is highly recommendable to generate small area unemployment as the official statistics.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.2
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• pp.167-173
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• 2006

Ionosphere is the largest error source on propagation of GPS signals. Dual frequency (L1,L2) GPS receiver can be effectively able to eliminate the ionosphere error by using linear combination of two frequencies, but the single frequency receiver (L1) have to compute the ionosphere error. In this research, we developed the new ionospheric model with $1^{\circ}$ by $1^{\circ}$ spatial resolution based on the grid from using 9 GPS reference stations which have been operated by KASI (Korea Astronomy and Space Science Institute) and computed TEC (Total Electron Contents) over South Korea by epoch. This paper gives the positioning results of Klobuchar model with that of a newly developed KASI regional ionospheric model and shows the positioning precision of the KASI regional ionospheric model along with TEC variation of ionosphere.

• Proceedings of the Korean Journal of Food and Nutrition Conference
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• 1998.06a
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• pp.23-36
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• 1998

문명이 고도로 발달하고 환경위생상태가 양호한 최근에도 세계 도처에서 끊임없이 식중독이 발생되고 있다. 세계보전기구에 의하면 현재 전세계적으로 가장 많이 발생하는 인간의 건강상의 위해 요인은 식중독을 포함하여 오염된 식품으로 인한 질병이라고 생각되고 있다. 이들 중 일부는 출처에서부터 오염된 식품에 의한 것이며, 그 나머지는 식품을 부주의하게 취급함에 의한 것이다. 실제로 지구상 인구의 일부는 생존을 위해서 먹는 음식물에 의하여 식중독이 야기되어 불필요하게 사망하고 있는 것이다. 우리의 일상의 식생활에 있어서 음식물의 취급과 섭취에 주의를 기울이고 올바른 위생 행태를 실천한다면 식중독 발생과 사망, 그리고 경제적 손실을 상당히 줄일 수 있을 것이다. 한편 식중독으로 보고되는 공식적인 추계는 선진국에서조차도 빙산의 일각에 불과하다는 것이 세계적 전문가들의 지론으로서 대개 실제 발생사례의 10% 정도만이 보고되는 것으로 알려지고 있다. 우리 나라의 경우 보고된 통계자료에 의하면 1965년부터 1986년까지의 식중독 경향은 사망자수는 상당히 감소 (연간 40여명에서 10여명 수준으로) 하였으나 이는 아직 급성전염병으로 인한 사망자수를 상회하는 수준이었다. 최근 10년간 (1987-1996)에는 발생수가 연간 31-104건으로 집계되고 있으며 사망자수는 아직도 연간 5-12명으로 나타나고 있다 (감염병 발생정보 등). 1977년에 발생하였던 학교급식 식중독 사례 (1977년 9월, 초등학교 점심급식, 발병자 5,500명 이상, 사망자 1명, 원인식품=크림빵, 병인물질-포도상구균)는 아직도 커다란 교훈으로 남아있다. 우리 나라의 경우 이와 같이 공식적인 식중독 통계자료의 결과가 제시되고는 있으나 식중독 사례에 대한 면밀한 사안이 밝혀지는 경우가 많지 않다. 또한 그 발생 경위나 원인요소에 대해서는 일반에게 공개되지 않고 있어, 우리가 실천하여 식중독을 예방할 수 있는 정보가 함께 제시되지 못하는 형편이다. 따라서 본 고에서는 최근 수년간 외국에서 학교급식을 비롯한 집단급식 등에서 발생한 식중독 사례를 중심으로 고찰, 분석하였다. 이로부터 식중독 발생에 기여한 주요 원인을 찾아내고 여기서 얻어지는 교훈을 토대로 식중독 발생을 예방 및 최소화할 수 있는 실천적 대처 방안을 모색해 보고자 한다.

• Journal of Digital Contents Society
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• v.16 no.3
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• pp.417-424
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• 2015

The research of occupational injury for safety and health is a comparatively recent occurrence. As labor activities took place regarding to employee concerns in industrial uprising, human resources health was tried to enhanced as a labor safety subject. Noticing that traditional statistics approach has limitations in learning future forecasting and major factors causing occupational injuries in each industry, Korean Government initiated a quantitative systematic simulation model project to analyze how the annual injury rate has been dropped and stays in a level for recent years. From this motivation and the project, system dynamics models have been developed to explain the mechanisms for reducing annual injury rate, and the mechanisms quantitatively. The main cause effects for the reduction of annual injury rate were due to the government driven investment on safety facilities. In overall viewpoint the gain achievable from these efforts has been reached a saturated level. However, it could reduce the annual injury rate if you chose the industry and size carefully. The model for forecasting, major injury factors, safety budget and allocation are introduced and analyzed, and Analyzing occupational injury related factors can also reduce employee injury and disease related costs, including medical care, quit, and disability assistance costs.

• Journal of Korean Society of Forest Science
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• v.79 no.3
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• pp.231-244
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• 1990

As the complexity of society increases, the demand for the forest-based recreational site is also increased. This, in turn. makes congestion an ubiquitous type of externality in forest-based recreational site. Efficient resource allocation requires this congestion effect to be accounted and considered in the decision making process. In this content, this study was conducted to suggest a process which can be used to measure the congestion and determine the optimal number of users. Willigness to pay(WTP) function obtained from Book Han San National Park users suggested that every 20.000 users increased decrease the satisfaction of users obtained from the site visit be 27.3%. For the purpose of demonstration this WTP function is applied tit determine the optimal number of users which is estimated as about 73,000 persons per day.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.28 no.4
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• pp.413-420
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• 2010

The ionospheric delay is currently one of the most significant error sources in precise GNSS surveys. The users of single-frequency receivers should apply some kind of ionospheric correction algorithms to remove or model the ionospheric delay. For real-time correction of the ionospheric delay, one can use Klobuchar or NeQuick model provided by navigation messages of GPS and Galileo, respectively. We evaluated the performance of those models by comparing their effectiveness at different seasons and latitudes. For the first test, we computed the vertical total electron content (VTEC) at the permanent GPS site SUWN for four different seasons. As the second test, we picked three sites in Korea (CHLW, SUWN, JEJU) with high, medium, and low latitudes and evaluated the dependency of VTEC on the site latitude. Computed VTEC values were compared with those from the IRI model and Global Ionosphere Maps (GIM). The root-mean-square (RMS) differences of Klobuchar and NeQuick with respect to IRI and GIM were analyzed. As a result, without regard to season and latitude, the RMS differences of NeQuick models were smaller than that of Klobuchar by about 0.01~3.50 TECU.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.4
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• pp.659-664
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• 2020

In this paper, we propose a silicon-based electro-optic (EO) modulator which can modulate a sign of a topological charge number l of |l|=1 orbital angular momentum (OAM) mode. The proposed EO modulator consists of position-dependent doped Si waveguide core and undoped SiO2, cladding, which enables control of the effective index and propagation loss of two OAM constitutive eigenmodes. The modulator functions as OAM mode maintaining waveguide at -0.33V and as topological charge sign inverter at 10V. The output OAM mode purity is calculated through electric field distribution, showing high purity of |l|>0.92 in both cases.