Development of Organic Fertilizer Solution for Hydroponics

Lee Junghye,Hwang Kyu Hyon,Park Ju-Hyun,Ha Tai-Moon,Lee Sang-Woo,Seo Myeong-Whoon 한국원예학회 2017 한국원예학회 학술발표요지 Vol.2017 No.5

Testing the Predictability of the Expectancy

Junghye A. Kah,Choong Ki Lee,Seong Hoon Lee 한국관광연구학회 2015 관광연구저널 Vol.29 No.4

There have been many indications that expectations and values are the most popular approaches to satisfaction. However, the inclusive theoretical models which readily specify the measurements were under-researched in tourism literatures. In this context, there was a need for a comprehensive framework clarifying the dimensions and the evaluative constructs in a satisfaction model. Therefore, this study examined two evaluation processes that measure tourist satisfaction with Seoul Lantern Festival 2013 in South Korea by comparing the validity of the expectancy disconfirmation model and value disconfirmation model. The study provided three results: (1) tourist satisfaction is a final result formed by comparing tourist experiences with products or services and the comparison standards of expectation and value, (2) satisfaction is better explained by multiple dimensions than single determinants of tourist’s perspective, and (3) the value disconfirmation model has a higher explanatory power than the expectancy disconfirmation model while the integrated model is better than the distinct model in explaining tourist satisfaction. These results imply that investigating the effects of each component on satisfaction enhanced the role of disconfirmation as a determinant of tourist satisfaction. However, perceived performance and perceived value are also powerful determinants in addition to expectation and expected value. In this regard, the impact of each component on satisfaction demands that marketing efforts enhance destination expectations and desires destination before trips.

Perception of and attitude toward ethical issues among Korean occupational physicians

Junghye Choi,Chunhui Suh,Jong-Tae Lee,Segyeong Lee,Chae-Kwan Lee,Gyeong-Jin Lee,Taekjoong Kim,Byung-Chul Son,Jeong-Ho Kim,Kunhyung Kim,Dae Hwan Kim,Ji Young Ryu 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-

Background: Occupational physicians (OPs) have complex relationships with employees, employers, and the general public. OPs may have simultaneous obligations towards third parties, which can lead to variable conflicts of interests. Among the various studies of ethical issues related to OPs, few have focused on the Korean OPs. The aim of the present survey was to investigate the ethical contexts, the practical resolutions, and the ethical principles for the Korean OPs. Methods: An email with a self-administered questionnaire was sent to members of the Korean Society of Occupational and Environmental Medicine, comprising 150 specialists and 130 residents. The questionnaire was also distributed to 52 specialists and 46 residents who attended the annual meeting of the Korean Association of Occupational and Environmental Clinics in October 2015, and to 240 specialists by uploading the questionnaire to the online community ‘oem-doctors’ in February 2016. The responses to each question (perception of general ethical conflicts, recognition of various ethical codes for OPs, core professional values in ethics of occupational medicine, and a mock case study) were compared between specialists and residents by the chi-squared test and Fisher’s exact test. Results: Responses were received from 80 specialists and 71 residents. Most participants had experienced ethical conflicts at work and felt the need for systematic education and training. OPs suffered the most ethical conflicts in decisions regarding occupational health examination and evaluation for work relatedness. Over 60% of total participants were unaware of the ethical codes of other countries. Participants thought ‘consideration of worker’s health and safety’ (26.0%) and ‘neutrality’ (24.7%) as the prominent ethical values in professionality ofoccupational medicine. In mock cases, participants chose beneficence and justice for fitness for work and confidential information acquired while on duty, and beneficence and respect for autonomy in pre-placement examinations. Conclusions: This study evaluated the current perception of and attitude toward ethical issues among the Korean OPs. These findings will facilitate the development of a code of ethics and the ethical decision-making program forthe Korean OPs.

Classification of High Dimensionality Data through Feature Selection Using Markov Blanket

Lee, Junghye,Jun, Chi-Hyuck Korean Institute of Industrial Engineers 2015 Industrial Engineeering & Management Systems Vol.14 No.2

A classification task requires an exponentially growing amount of computation time and number of observations as the variable dimensionality increases. Thus, reducing the dimensionality of the data is essential when the number of observations is limited. Often, dimensionality reduction or feature selection leads to better classification performance than using the whole number of features. In this paper, we study the possibility of utilizing the Markov blanket discovery algorithm as a new feature selection method. The Markov blanket of a target variable is the minimal variable set for explaining the target variable on the basis of conditional independence of all the variables to be connected in a Bayesian network. We apply several Markov blanket discovery algorithms to some high-dimensional categorical and continuous data sets, and compare their classification performance with other feature selection methods using well-known classifiers.

Hydroponic Nutrients Solutions for Production of Plants with Low Potassium

Junghye Lee,Ju-Hyun Park,Tae-Moon Ha,Young-seok Lee,Myeongwhoon Seo 한국원예학회 2018 한국원예학회 학술발표요지 Vol.2018 No.5

Prediction of Hypertension Complications Risk Using Classification Techniques

Lee, Wonji,Lee, Junghye,Lee, Hyeseon,Jun, Chi-Hyuck,Park, Il-Su,Kang, Sung-Hong Korean Institute of Industrial Engineers 2014 Industrial Engineeering & Management Systems Vol.13 No.4

Chronic diseases including hypertension and its complications are major sources causing the national medical expenditures to increase. We aim to predict the risk of hypertension complications for hypertension patients, using the sample national healthcare database established by Korean National Health Insurance Corporation. We apply classification techniques, such as logistic regression, linear discriminant analysis, and classification and regression tree to predict the hypertension complication onset event for each patient. The performance of these three methods is compared in terms of accuracy, sensitivity and specificity. The result shows that these methods seem to perform similarly although the logistic regression performs marginally better than the others.

Classification of High Dimensionality Data through Feature Selection Using Markov Blanket

Junghye Lee,Chi-Hyuck Jun 대한산업공학회 2015 Industrial Engineeering & Management Systems Vol.14 No.2

A classification task requires an exponentially growing amount of computation time and number of observations as the variable dimensionality increases. Thus, reducing the dimensionality of the data is essential when the number of observations is limited. Often, dimensionality reduction or feature selection leads to better classification performance than using the whole number of features. In this paper, we study the possibility of utilizing the Markov blanket discovery algorithm as a new feature selection method. The Markov blanket of a target variable is the minimal variable set for explaining the target variable on the basis of conditional independence of all the variables to be connected in a Bayesian network. We apply several Markov blanket discovery algorithms to some high-dimensional categorical and continuous data sets, and compare their classification performance with other feature selection methods using wellknown classifiers.

Hypertension Occurrence Analysis using a Bayesian Network

Junghye Lee(이정혜),Wonji Lee(이원지),Hyeseon Lee(이혜선),Chi-Hyuck Jun(전치혁) 대한산업공학회 2014 대한산업공학회 춘계학술대회논문집 Vol.2014 No.5

The Bayesian network (BN) is a useful method for modeling healthcare issues since a BN can graphically represent causal relationships among variables and provide its probabilistic information,. In this study, we apply a BN method to hypertension occurrence analysis. This study used the National Health Insurance Corporation (NHIC) database from 2002 to 2010 which contains more than 100,000 cases of personal medical examinations in Korea. We investigate the causality for hypertension occurrence by a structure learning step, and then evaluate the performance to predict hypertension occurrence through parameter learning and inference steps. It is shown that the BN outperforms other prediction methods such as logistic regression, naive Bayes and support vector machine in terms of sensitivity. In addition, the BN has advantages in interpreting which variables affect the hypertension occurrence and how they are related to each other.

Causality Analysis for Public and Private Expenditures on Health Using Panel Granger-Causality Test

Lee, Su-Dong,Lee, Junghye,Jun, Chi-Hyuck Korean Institute of Industrial Engineers 2015 Industrial Engineeering & Management Systems Vol.14 No.1

Every year governments spend their national budget on public health in order to reduce financial burden of individuals on health. Although it has been widely believed that the increase of public expenditure on health decreases private health expenditure, it has not been proved by analysis with real data. For better understanding, we conducted an empirical study on the real data of 17 OECD countries-Australia, Austria, Canada, Denmark, Finland, Germany, Iceland, Ireland, Japan, Korea, New Zealand, Norway, Portugal, Spain, Sweden, the United Kingdom, and the United States. The panel Granger-causality test is used to verify the cause-and-effect relationship between the two expenditures. As a result, public expenditure on health has a 3 to 4 year-lagged negative effect on private health expenditure in the cases of the 16 countries except for the United States.

A Study on a Landscape Management Plan for the Intensive Landscape Management Zone in Muju County

Junghye Lee,Jina Bae,Sutae Kim,Hyunsuk Kim 전북대학교 휴양및경관계획연구소 2018 휴양및경관연구 (J East Asian Landscape Studies) Vol.12 No.1

This study on the intensive landscape management zone of Muju county in Korea was conducted for the purpose of first, developing landscape guidelines that take the current conditions of the landscape in the area and tourists’ requirements into account and second, exploring ways to implement them. The current conditions of the landscape resources in the area were analyzed by conducting a theoretical examination; a survey of the current status of the landscape; and a questionnaire survey of the local people, tourists, and public officials. Based on the result of those surveys, the guidelines for the landscape design of the intensive landscape management zone were set, and measures to implement them were explored. The results of this study are as follows: 1. For the building landscape of the Meeting plaza at Muju IC, a variable structure made of natural materials is suggested for the extended space in front of the mall, while an integrated design of street furniture and installation of a landmark and its design are suggested for the streetscape. 2. For the area of Bandi Land and Taekwondowon, improvement of the street structure for the main street and of the height of the buildings, taking the view of mountains into account, is suggested, and the design is also proposed. 3. For the Muju Resort and entrance to the Gucheondong valley of Muju, building planning that takes fine natural views into account, as well as reorganization of public and commercial signboards, are suggested, and the design is also proposed. 4. For the implementation of these plans, focus is placed on the current status of land use by zone. First, implementation of landscape projects and switching to a roundabout at the entrance are proposed for the Muju IC Meeting Plaza. Second, a district-unit plan is suggested for Bandi Land and Taekwondowon areas because new development projects are planned for them. Third, a landscape agreement is suggested for the Muju Resort and the area of entrance to the Gucheondong valley of Muju because those are already-developed areas where active commercial activities are performed.