충남 옥천군 군서지역에 있어서의 환경위생적 조사연구

이병국,맹광호,이광묵 최신의학사 1975 最新醫學 Vol.18 No.2

An Environmental and santiary survey was carried out on 585 houses and 36 wells in Gunseo Area, Okcheon-Gun, Choongbook Province. As a survey on sanitary environments of houses, number of rooms they were using, artificial lightening method, house heating method and sanitary measures in the kitchen were checked. Sanitary environments of drinking water sources were also investigated. Other tested items with water samples were hardness, pH, and chloride ion, and the results were summarized as follows: 1. 38.1 % of all subjected households were using 2 rooms and 29.4%, 3 rooms. 97.0% of all households were lightening their houses with oil lantern and those who were using elec tric lights were 1.7%. Those who were using coal briquett for their house heating were 12 households (2.0%). 7.4% of all households did not have any cupboard in their kitchens and those who were using dry wiping cloth were only 30.3% among all subjected housholds. 2. Main drinking water source was well (78.3%) and the pump was next (15.0%). 33.3% of all drinking water sources were beeing used by more than 6 househods. 96.1% of all drinking sourees (except pumps) were not covered and the drainage was bad in 30.0% of all drinking sources. 3. 47.0% of all households were disposing sewage unsanitarily and most of the rubbishes (93.2%) were beeing used for a compost. 4. 1% of the households were throw them away around their houses. Excrements were beeing used for fertilizer among 97.9% of all households. 4. The average hardness of 36 sampled well water was 188 ppm and the hardness of 7 samples(19.5 %) were over 300 ppm. 5. The average pH of 36 well surveyed were 6.48. Two samples were below 5.5 and 4 were over 7.1. 6. The average chloride ion of all samples were 75.2 ppm. The chloide ion of 4 samples were over 150 pPm, the international standard for drinking water.

한국산 재료를 이용한 밀폐의 차음효과

백남원,유병국,이광묵 가톨릭대학산업의학센타 산업의학연구소 1977 韓國의 産業醫學 Vol.16 No.4

In industrial areas where noise level and the worker exposure time exceed the criteria, and evaluation should be made to determine the most economical solution to the problem. A large reduction in noise can be achieved by complete enclosure of a noise source. This study was carried out to determine the effect of Korean-made materials in noise reduction. A blower producing noise level of 91 dBA was used as a noise source, and plywood having surface density of 9.5 kg/㎥ and thickness of 1.8cm was used as sound-isolating partition and glass fivers of various densities and thicknesses were used as sound absorbing materials. Noise reduction effect of total and partial enclosures was evaluated. The results are summarized as follows. 1. When the blower was enclosed with and unlined enclosure constructed by plywood, the noise reductions by total and partial enclosures were 17㏈ and 9㏈ respectively at A-weighted measurements, which indicated lower effectiveness than the theoretical effect of the plywood. This could be resulted from the reverberant buildup in the enclosure. 2. To reduce the reverberation, glass fibers of various densites and thicknesses were covered inside the wall of enclosure and the effectiveness was as follow. 1) Noise reductions by plywood plus glass fibers having densities of 25-48 kg/㎥ and density of 100kg/㎥ were 20-25㏈ and 30㏈ respectively. 2) Noise reductions at 4,000 Hz by plywood plus 48kg/㎥ glass fibers having thicknesses of 2.5cm and 5.0cm were 31 and 41㏈ respectively. By doubling the thickness of glass fibers the noise reduction increased by 5㏈ at A-weighting. 3) The difference in noise reduction between total and partial enclosure was ranged from 5㏈ to 11㏈ at A-weighting. The higher the density of glass fibers were, the difference increased.

웹 브라우져를 통한 서버 클라이언트 환경의 영상처리 실습 시스템 설계

이병일,손병환,최항묵,최흥국 인제대학교 2001 仁濟論叢 Vol.16 No.1

웹 기반의 환경은 인터넷과 컴퓨터의 접목으로 실생활에서 연구활동에 이르기까지 다양하게 그 효용성의 범위를 굳혀가고 있다. 교육기관에서 활용하는 가상강좌는 이러한 웹의 장점을 활용한 학습방법의 다양화의 결과이다. 본 논문에서 설계한 웹 브라우져를 통한 서버 클라이언트 환경의 영상처리 실습 시스템은 가상강좌나 웹 환경이 구축된 장소에서 교육자와 피교육자사이의 교육효과를 증진시키도록 상호 의사전달의 효율성을 가지게 하는 시스템이다. 각 클라이언트가 다운로드 받은 컴포넌트를 실행하여 구동하게 되면 클라이언트들이 자신의 실습을 위한 프로그램을 로컬에서 가동할 수 있도록 하였기 때문에, 서버측의 부하가 얼어서,실습 결과영상을 로컬 클라이언트에서 부하시간 없이 얻을 수 있게 하였다. 또한 서버의 수정 혹은 갱신으로 바뀌어진 컴포넌트는 클라이언트 측에서 접속시 업데이트가 가능하므로 각 클라이언트에 대한 업 데이트를 따로 고려하지 않아도 되는 장점이 있다. 또한 컴포넌트가 가지는 여러 가지 메쏘드들은 다양한 영상처리의 결과를 볼 수 있게 해 줌으로써 고가의 소프트웨어를 따로 구입하지 않아도 되는 장점을 가지게 된다. The environment of web is applied variously from our life to research activities thanks to the internet and the computer. The virtual lecture utilized by an educational institution is the result of application of a learning system with the advantage of web. In this paper, a design of the image processing training system at the environment of server-client through web browser is the system of high degree of efficiency at the point of communication between lecturer and student. A client can get the result image from another client without load balancing of the server, because the processer for image processing is operated at the container of a client after downloaded as the form of a component. Clients can get the new version of component when they contact, so clients do not need to consider the status of updated component locating in the server. Furthermore, the client can handle an image with the many operations included in component with no purchase of the software additionally, that is another merits of this system.

고유량 고효율 혈액투석막 재사용의 임상경험

조현경,김승정,임병국,정혁준,최영일,마경애,신규태,김흥수,김도헌 대한신장학회 2001 대한신장학회잡지 Vol.20 No.3

Regional Difference in Retail Product Association of Market Basket Analysis in US

Byong-Kook YOO(Byong-Kook YOO),Soon-Hong KIM(Soon-Hong KIM) 한국유통과학회 2023 유통과학연구 Vol.21 No.4

Purpose: Market basket analysis is one of the most frequently used methods in the retail industry today as a technique to discover the product association. It is empirically analyzed how these product associations differ regionally in the case of the United States. Research design, data, and methodology: Based on the purchasing data of consumer panels collected from 49 US states, the association rules for each state was extracted with the corresponding lift values indicating product association. The difference in lift values in 49 states by the association rule was compared and tested for 49 states and for 4 census regions (Northeast, Midwest, South, West). Results: The association rules of 3/4 of the same association rules show positive associations or negative associations depending on the lift values of the states. There were significant differences in the lift values for 49 states, and for 4 census regions. These significant differences in the lift values were found to be related to the distance between states and whether states belong to the same census region. Conclusions: Retail product associations shown by market basket analysis may vary depending on regional distance or regional heterogeneity. It is necessary to pay attention to these points in multi-store environment.

Formation of Employment Subcenters and Regional Industry Restructuring: Focusing Wholesale and Retail Sector in Incheon

Byong-Kook Yoo,Soon-Hong Kim 한국유통과학회 2020 유통과학연구 Vol.18 No.2

Purpose: This study examines the relationship between formation of employment subcenters and regional industrial structures in Incheon. Research design, data, and methodology: We used the five-year panel data from 2012 to 2016 in 146 basic municipal units of Incheon to analyze panel regression models. Gross employment density and employment to population ratio were used as indicators of employment subcenters formation. The entropy index and Hachman index were used for analyzing the diversity and heterogeneity of industrial structures. Result: The analyses of two panel regression models showed that for the formation of employment subcenters, both the Entropy and Hachman index were significantly negative in most models. But tertiary industry was shown to have a significant positive relationship in all models. In the wholesale and retail sector, it was found that the average number of employees in the employment subcenters is significantly higher than that in the non-employment subcenters. Conclusions: The specialization of the industrial structure rather than the diversification contributes to the formation of the employment subcenters in Incheon. In particular, it can be considered that the wholesale and retail sector plays a very important role in forming the employment subcenters in many areas of Incheon.

A Study on Employment-centric Industries in Incheon Using Machine Learning Method

Byong Kook Yoo,Soon Hong Kim 한국유통과학회 2017 한국유통과학회 학술대회 논문집 Vol.2017 No.-

The industrial structure in Incheon has a very significant difference compared with the change in the industrial structure of the whole country. Thus, reflecting those differences, the unemployment rate in Incheon has always been higher than the national average. The purpose of this study is to identify the employment - oriented industries in Incheon area using machine learning techniques. First, the relationship between employment ratio and employment by industry was examined through regression analysis. Second, we examined the characteristics of industrial areas with high employment rate through decision tree analysis. Third, a random forest model was used to predict regional employment changes. Through such a machine learning model, the Incheon area still has a base of traditional manufacturing, but it is characterized by the expansion of the service industry such as wholesale and retail business. Machine learning methods have multiple tools analyzing and reporting complicated non-linear relationship in data effectively. In addition, a random forest model was used to predict employment changes due to industrial structure changes. This machine learning model shows that beverage manufacturing industry has the highest employment rate in Incheon and expansion of service industry such as wholesale and retail business is prominent.

A Study on Predicting Shopper’s Retail Format Choice

Byong Kook Yoo,Soon Hong Kim 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-

As competition is getting fiercer between retail formats, the strategy to prevent shoppers from churning is very important in terms of shopper relationship management. In particular, as the traditional market is threatened and the national chain enters the market, the impact from entry of a national chain such as failure of shopper retention becomes an important concern not only for local retailers but also for local communities. Also, it is important for national chains to predict potential new shoppers in newly launched market because it is directly related to market entry feasibility. In this case, accurate predictions can become more important than the relationship analysis between the influential factors. In general, shopper churn for retail stores is known as partial churn, not complete churn. Therefore, it is necessary to develop a predictive model to consider not only retail format choice (i.e., national chains or traditional market) but also the possibility of cross-shopping derived from the partial churn. The existing (linear or logistic) regression model is a very useful tool for analyzing the relationship between influential factors, but it requires a preliminary assumption of the population and has limitations in establishing a predictive model of complex nonlinear relationships.

유통배급단계에서의 영화흥행예측

유병국(Byong-Kook Yoo),김순홍(Soon-Hong Kim) 한국물류학회 2023 물류학회지 Vol.33 No.1

대부분의 영화흥행 예측모형에는 영화제작, 관람객, 영화상영 등에 관한 다양한 변수들이 사용된다. 그러나 영화가 개봉된 유통배급단계에서 가장 중요한 변수중의 하나는 입소문의 진원지인 관람객과 관련된 영화리뷰라고 할 수 있다. 지금까지 다양한 변수들이 사용된 대부분의 예측모형에서는 영화리뷰가 감성변수로 치환되어 분석에 사용되었는데 이 경우 영화흥행에 대한 입소문의 내용 등을 구체적으로 파악하기 어렵다는 한계를 가진다고 할 수 있다. 본 논문에서는 온라인 포털 사이트의 영화리뷰를 구성하는 단어만을 영화흥행 예측모형의 독립변수로 하여 영화흥행실적과의 관계를 LASSO모형을 이용하여 파악하고자 하였다. 이를통해 영화리뷰가 영화흥행여부에 미치는 예측력을 평가하였으며 영화흥행에 영향을 미치는 영화리뷰상의 단어들을 조사하였다. 조사결과 단어들의 LASSO회귀계수는 영화흥행여부와 상관관계를 가지고 있었는데 흥행영화의 리뷰에 나오는 경향이 강한 단어일수록 계수 값이 증가하는 반면 비흥행영화의 리뷰에 나오는 경향이 강할수록 감소하는 관계를 보였다. 이와 같은 결과로 영화리뷰를 이용한 영화흥행예측은 세부적인 입소문 등 영화 유통배급단계에서의 추가적인 투자계획에 활용될 수 있다고 할 수 있다. Most movie box office predictive models use various variables related to movie production, audience, and movie screening. However, one of the most important variables in the distribution stage when a movie is released is the movie review related to the audience, that is the subject of word of mouth. In most predictive models in which various variables have been used so far, movie reviews have been substituted into emotional indices for additional analysis. In this case, it can be said that it has a limitation in that it is difficult to specifically grasp the contents of word of mouth about the movie. In this paper, only words constituting movie reviews on online portal sites were used as independent variables in the movie box office predictive model, and the relationship with movie box office performance was identified using the LASSO model. Through this, the predictive power of movie reviews on movie box office success was evaluated, and the words in movie reviews that affect movie box office were investigated. As a result of the analysis, the LASSO regression coefficients of words had a correlation with the success of the movies. The LASSO regression coefficients increased as the words appeared in reviews of successful movies, but decreased as they appeared in reviews of unsuccessful movies. As a result, it can be said that movie box office prediction using movie reviews can be helpful for planning additional investment strategy at the distribution stage.

콘크리트 기둥과 철골 보 합성골조 접합부에서의 지압강도

김병국(Byong-Kook Kim),이원규(Won-Kyu Lee),최완철(Oan-Chul Choi) 한국콘크리트학회 2003 콘크리트학회논문집 Vol.15 No.3