• Journal of the Korean housing association
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• v.20 no.1
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• pp.37-44
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• 2009

Sleep has big influence on our life, for example productivity, character formation of babies, mortality and the people who suffered from sleep problem are also diverse. Therefore, indoor environmental supports for good sleep, might be different with the situation and need of respective person. The objectives of this study are: 1) to investigate the current bedroom condition, sleep problem, and life pattern of Korean. 2) to classify Korean into several groups and explain their characteristics relevant to sleep, in order to understand Korean's need for good sleep. The questionnaire was sent out to Seoul and its environs in Jan.$\sim$Feb. 2008, and total of 702 questionnaires were collected. The research on the bedroom condition was conducted around perceived influence of environmental factors, opening and closing of the door, cooling and heating strategy, clo value during sleep, bedding type, lighting, sharing bedroom. People are divided into 6 groups by 8 factors, and 5 groups could be seen that they need some management for good sleep because of their sleep problem.

• Journal of the Korean housing association
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• v.26 no.4
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• pp.55-62
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• 2015

The international concern on the inhalable fine dust is continuing to increase. In addition to the toxic properties of the fine dust itself, it can be more dangerous than other environmental factors since the dust pollution is hard to be detected by human sense. Although the information on outdoor air condition can be acquired easily, the indoor dust concentration is another problem because the indoor air condition is influenced by the architectural environment and human activity. It means occupants may be exposed to indoor dust pollution over a long period without being aware. Therefore the indoor dust concentration should be measured separately and visualized as an intuitive information. By visualizing, the indoor dust concentration in each space can be recognized practically in compare with the degree of pollution in adjacent spaces. Besides the visualization outcome can be used as base data for related research such as an analysis of the relation between indoor dust concentration and architectural environment. Meanwhile, with the development of network and micro sensing devices, it became possible to collect wide range of indoor environment data. In this regards, this paper suggests a system for visualization of indoor dust concentration and demonstrates it on an actual space.

• Korean Institute of Interior Design Journal
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• v.19 no.2
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• pp.234-242
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• 2010

The twenty seven houses at Incheon city, were remodeled in 2009 for the physically handicapped people. This research had been done the analysis of the itemized questionnaire by the needs of the physically handicapped for their better living environment and suggested the following remodeling devices. First of all, there was the priority for the remodeling of their living facilities. According to their priority, they wanted to remodel their bathroom, kitchen & dining room, veranda, living room, and hall way. These were based on their needs of movement, personal hygiene, convenient closet, and cabinet usage. In particular, their demands were shown as followings. The wheelchair using handicapped people required safe doorknobs, unslippery floor materials, removal of step levels, and heights adjustable washing stand for their bathroom. They also requested washboard, non-threshold, and automatic door locks. Otherwise, the disabled in critical condition who could not move anything preferred the remodeling of inner structure of living spaces and automatic door system. The slight disabled and the families those who have the disabled demanded the remodeling of kitchen & dining room, and preferred the reorganization of closet, cabinets, floor tiles, and turncock. The remodeling of bedroom was mostly requested by the disabled women, people with the brain disorder, and disabled people in critical condition who could not move anything. They wanted the remote controlled lightings.

• Journal of Environmental Impact Assessment
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• v.20 no.1
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• pp.89-96
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• 2011

This study was carried out to assess the variations of water quality caused by the dam construction on the river. Six dams-Yongdam, Miryang, Hoengseong, Boryeong, Jangheung and Buan- constructed recently in Korea were selected for the study. Chemical oxygen demand(COD) was increased in the initial stage of water storage at dams compared to the lotic(river) environment, but after 3 years it was maintained lower and stabilized concentrations. Five dams except for Jangheung Dam were maintained Ia~Ib grade conditions under the water quality criteria of Korea. The concentrations of total nitrogen(T-N) were decreased under the lentic(reservoir) environment compared to the river status. Total phosphorus(T-P) was decreased 13~63% at the reservoir condition. We concluded that increase of COD concentration was due to the debris organic materials of the land, but temporary phenomenon. T-N and T-P concentrations were decreased at the lentic condition compared to the lotic.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.20 no.1
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• pp.55-75
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• 2017

The purpose of this study is to present the basic data for restoration of physical stream environment by analyzing habitat variables because habitat environment is changed due to the construction of waterfront space in urban streams. Assessment results of 10 habitat variables(three divisions) were almost same as optimal condition, in the reach of reference stream where there are no stream crossing structures and channel alteration. Assessment results of reaches in urban rivers, where streams were improved on water-friendly recreation activities, appeared to be marginal condition. Because habitat environment got worse due to stream improvement works such as construction of weir for water landscape, stepping stones for walking, low water revetment and high water revetment, and high water channel. In addition, in the case of mid gradient stream, the frequency of riffles was small or not existed because the intervals of the river crossing structures was short. In the case of mild stream types, the diversity of the pool was damaged due to the deposition of sludge in the upstream pool of weir and the installation of low water revetment.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.736-742
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• 2010

This study was conducted to characterize on the relationships of rainfall intensity and infiltration rate of rainfall dependent on unit weight change in the gneissic weathered soil by a column test equipment. In this study, volumetric water content and pore water pressure were measured using TDR sensors and tensiometers at regular time intervals. Rainfall conditions including continuous rainfall and repeated rainfall were selected in order to know the effect of antecedent rainfall. In the condition of rainfall intensity 20mm/h and the unit weights of soil as $1.35g/cm^3$, $1.55g/cm^3$ and $1.61g/cm^3$, average rainfall infiltration rate was $2.814{\times}10^{-3}cm/sec$, $1.969{\times}10^{-3}cm/sec$ and $1.252{\times}10^{-3}cm/sec$ respectively. The higher rainfall intensity and lower unit weight of soil, the faster average infiltration rate. Overflow in the column was happened except rainfall condition of rainfall intensity 20mm and soil unit weight $1.35g/cm^3$. Increasing the soil unit weight, overflowed water was increased and occurrence time was faster.

• Journal of the Korea Safety Management & Science
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• v.8 no.6
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• pp.91-108
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• 2006

RFID/USN is important infrastructure of the ubiquitous society. And so, It is various and practical research is attempted. These two base technology have physical characteristic and complement relationship. Like this relationship is applied Following example that is system research which manages warehouse stocks and conditions. First, We adhere RFID Tag at the Pallet of the warehouse and do identification goods. And then, It grasps the environment state information of stocks with sensor module which has Zigbee wireless communication function. From like this process RFID Tag information and jop-control command of sensor node also it is exposed to air. Therefore, We control sensor node in USN/RFID environment through the mobile device. And system design for the security Apply of the process is main purpose of this paper's. We propose the condition and function of the mobile device to the secondary. And We define the relation of the sensor node with RFID to be arranged to a warehouse. Finally, This paper is designed to find a trade-off of the following viewpoints. First, We offer suitable sensor-control information to a actual manager. Second, We offer RFID tag security approach to control the action of the sensor. Third, It increases the survivability of sensor node form.

• Korean Journal of Human Ecology
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• v.14 no.3
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• pp.491-504
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• 2005

This research studies the residential environment of the elderly and its trend. Our main focus is on the residential condition and its type between parents and their child/ren in korea which has already entered the aging society. The results are as follows: (1) This paper finds that the residence type of the households with elderly people becomes multifarious, as in a two-generation household, a couple and their single child, a couple family, etc. (2) The parents living separately from their child/ren account for 63.3%, which is becoming predominant in the residence type of the elderly. On the other hand, those living with their child/ren take up merely 24.5%. Thus, we can infer that the number of the parents with the former type is on the increase. (3) The residence type in reality is different from the one intended by elderly people, so we can estimate future change in the residence type. (4) The residence type varies, as in living together with young family, living separately from young family, separation at a distance, etc. In conclusion, we need appropriate living programs for each various residence type between elderly people and their children.

• Journal of environmental and Sanitary engineering
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• v.21 no.4 s.62
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• pp.1-10
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• 2006

This research is based on self-filling survey which 220 dental hygienists who work in seoul participated on July 2006 through August 2006. This survey was analyzed the experience item and occurred time of the symptoms and the time of acute and vanish of the symptoms that dental office's working environment effects on physical subjective symptom. We suggest a plan to minimizing physical subjective symptom for health manage of dental hygienist. We found out the fact that dental hygienists were unsatisfied with hospital air condition and this polluted air condition cause them physical subjective symptom in work place. As follows analyzed results ventilation time is below the 3-times a day, this may be have some trouble in indoor air quality. The experience the symptoms level is higher then non-experience level in "Fatigue and sleepiness", "Dorsalgia, omarthralgia, cervicodynia", "Hypersensitivity", "Dry eye, itch, smarting", "Headaches" and a subjective symptom is occurred at after 11:00(am) more then 60%, 50% of the dental hygienist. This experience the symptom' pain is vanished after the work and reduced when go out the office and building, respectively. The ratio of the experience the symptoms and starting time the symptoms is anywhere from 12 noon to 4 pm (73.2%) in a day. The time of acute pain the symptoms is anywhere from 12 noon to 4 pm (78.7%) refer to the individual characteristics and work environment.

• International Commerce and Information Review
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• v.8 no.4
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• pp.391-411
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• 2006

The present Study investigated on effect of working time and physical work environment on job satisfaction, and is based on a representative survey carried out in the 15 European Union Member States in 2,000 on behalf of the European Foundation for the Improvement of Living and Working Conditions by Infratest Burke Sozialforschung and a consortium of national fieldwork institutes. In the course of the survey, a total of 21,703 people drawn from the economically active populations in the 15 countries were questioned about their working time, overtime, weekend work, physical work environment, social support of supervisor and co-worker and job satisfaction. Regression analysis and subgroup analysis were employed to examine the hypotheses. It was found that weekend work, overtime and physical work environment associate negatively with job satisfaction. Social support of supervisor and co-worker moderated only relation between working time and job satisfaction. The results provide support for prior quantitative studies partly. Based on these significant research findings, theoretical implications were discussed.