• Journal of Korea Technology Innovation Society
• /
• v.16 no.3
• /
• pp.630-649
• /
• 2013

Korea Meteorological Administration has promoted the next generation urban and rural smart weather service project. The purpose of this project is to provide the necessary information to urban and rural districts by using the subdivided meteorological information. This study attempts to assess the value of the next generation urban and rural smart weather service project by using contingent valuation method. According to estimating result, annual mean willingness to pay per household for the next generation urban and rural smart weather service project is 2,947 won.

• Journal of the Korean Applied Science and Technology
• /
• v.26 no.1
• /
• pp.38-44
• /
• 2009

We proposed the new nano-carbon ball (NCB) materials for eliminating the total volatile organic compounds(TVOCs) from the felt which is built in the car. The concentrations of acetaldehyde and formaldehyde of the original felts were varied upon the different production lots. Acetaldehyde in the felt can be eliminated to target level($0.2{\mu}g$) after introducing 0.5 wt% of NCB into the felt. Detector tube method for analyzing formaldehyde gas was more accurate than HPLC method. Formaldehyde can be eliminated to target level (64 ppb) after introducing 0.5 wt% of NCB into the felt. We also found that TVOC can be reduced to target level ($0.32{\mu}g$) after introducing 2.0 wt% of NCB. Upon introducing small amounts of NCB into the felt, it was possible that the level of formaldehyde, acetaldehyde and TVOC formed from the felts can be reduced to the target level. We also suggest the effective analyzing method of TVOCs.

• Journal of Korea Multimedia Society
• /
• v.19 no.5
• /
• pp.901-909
• /
• 2016

Unprecedented attention is being given to Smart Grid, Micro Grid and Internet of Things (IoT) in the Republic of Korea recently but such systems' effect is not well experienced by the market since they require additional and costly reforms for the existing household electrical system where adaptive communication platforms are needed. As such platforms, both wireless and wire communication technologies are being considered at the moment. Usually, they include WiFi, Zigbee technologies and the latter, LAN technology. However, communication speed decline due to signal attenuation and interference during wireless communications are considered to be the major problem and the extra works involving time and costs for the LAN system construction can be another demerit. Therefore, in this paper, we have introduced a Power Line Communication-based Smart Outlet System Expandable at Home to complement these disadvantages. Proposed IoT system involves Power Line Communication (PLC) technology which is essential to constructing a Smart Grid.

• Journal of Soil and Groundwater Environment
• /
• v.21 no.6
• /
• pp.156-168
• /
• 2016

The Korean government is planning to invest a lot of funds for conservation of the soil. Accordingly, it needs quantitative information on the soil. This paper attempts to analyze the total value of soil quantitatively: the total economic value of soil can be divided into use value and non-use value. To this end, we apply a replacement cost method (RCM) and contingent valuation method (CVM). Especially, CVM is most widely used to measure the non-use value such as environment goods. We employed the one-and-one-half-bounded dichotomous choice (OOHBDC) for willingness to pay (WTP) elicitation and a spike model. The monthly mean WTP was estimated to be KRW 3,949 per household for the next 10 years, which is statistically significant at the 1% level. Expanding the value to the relevant population gives us KRW 897.9 billion per year and as of the end of 2015, the non-use value of soil was assessed to be KRW 838.6 billion. Meanwhile, use value is subdivided into direct use value and indirect use value. This value was calculated KRW 3,277 trillion and KRW 51.8 trillion, respectively. As a result, total economic value of soil is estimated to be KRW 3,330 trillion in Korea.

• Journal of the Korean Applied Science and Technology
• /
• v.26 no.4
• /
• pp.422-427
• /
• 2009

We have investigated the effects of polyols and NaCl on the rheological behaviours of surfactant mixtures. Sodium lauryl ether sulfate (SLES), cocamidopropyl betaine (CAPB), disodium cocoamphodiacetate (DSCA), cocamide DEA (CDEA) and lauroyl/myristoyl DEA (LMDE) were used as surfactants. The polyols added into the surfactant mixture were 1,3-butylene glycol, propylene glycol, glycerin, sorbitol, dipropylene glycol, PEG 1500 and PEG 400. The addition of amphoteric surfactant to SLES aqueous solution lead to increase the height of foam and the viscosity of the system. The addition of nonionic surfactant, LMDE or CDEA to the SLES aqueous solution increased the viscosity and the effect of LMDE was better than that of CDEA. The effect of adding polyols and NaCl into the surfactant mixture aqueous solution lead to increase or decrease the viscosity of the systems depending on the concentration of NaCl and the kinds of polyols. These results can be explained through the salting in or salting out of surfactant of the systems.

• Membrane and Water Treatment
• /
• v.2 no.1
• /
• pp.1-24
• /
• 2011

The deficiency of clean water is a major global concern because all the living creatures rely on the drinkable water for survival. On top of this, abundant of clean water supply is also necessary for household, metropolitan inhabitants, industry, and agriculture. Among many purification processes, advances in low-energy membrane separation technology appear to be the most effective solution for water crisis because membranes have been widely recognized as one of the most direct and feasible approaches for clean water production. The aim of this article is to give an overview of (1) two new emerging membrane technologies for water reuse and desalination by forward osmosis (FO) and membrane distillation (MD), and (2) the molecular engineering and development of highly permeable hollow fiber membranes, with polyvinylidene fluoride (PVDF) and polybenzimidazole (PBI) as the main focuses for the aforementioned applications in National University of Singapore (NUS). This article presents the main results of membrane module design, separation performance, membrane characteristics, chemical modification and spinning conditions to produce novel hollow fiber membranes for FO and MD applications. As two potential solutions, MD and FO may be synergistically combined to form a hybrid system as a sustainable alternative technology for fresh water production.

• Korean Management Science Review
• /
• v.31 no.4
• /
• pp.75-92
• /
• 2014

Broadcast-telecommunication bundling services provide customized services and reduce household telecommunication costs, contributing to the improvement of users' welfare. However, following the recent fierce competition of broadcast-telecommunication providers, the Korea Communications Commission, an organization that regulates promotional gifts and fee-reduction benefits to attract subscribers, has imposed a series of regulations. The excessive offering of promotional gifts can distort fair market competition and damage users. Yet if all bundling services are regulated uniformly, some benefits for users may be reduced, and the autonomous marketing competition of service providers may be restricted, thereby shrinking the entire communications market. Therefore, this study attempts to investigate domestic and foreign regulations on promotional gifts and other offerings related to broadcast-telecommunication bundling services, to analyze problems with respect to the current regulations and to propose an improvement plan. The study asserts that it is necessary to improve the violation decision criteria of the Korea Communications Commission and its regulations on broadcast-telecommunication service providers' promotional gifts in order to regulate the bundling services reasonably. In addition, it proposes a proper regulation of the OTS(Olleh TV Skylife) product, a new service emerging in the evolution of the bundling service type.

• Journal of the Korean Applied Science and Technology
• /
• v.24 no.2
• /
• pp.99-108
• /
• 2007

The cosmetic and toiletries are necessary health care & household for common life. However we need antiseptic which is effecting harmlessly to the human body. There are propolis, Lavender, Lemon, essential oil in the natural antiseptic materials. This work proceeded design Natural-antiseptic system with three materials as above-mentioned. Natural-antiseptic system was accomplished with propolis (2%), Lavender essential oil (0.3%), Lemon essential oil (0.3%) safety out of Polysorbate 20 (0.5%), Polysorbate 80 (0.5%), PEG (60) hydrogenated castor oil (0.45%), ethanol (5%). The antimicrobial test was experimented on E. coli and Bacillus stearothermophilus. In this antimicrobial test, we found that the effect of antisepsis against E. coli and Bacillus stearothermophilus with propolis 0.3%, Lavender essential oil 0.045% and Lemon essential oil 0.045% was improved. Therefore could expect Natural-antiseptic system product for moisturizing skin toner for face, nourishing essence and wet tissue for clean other things.

• Journal of the Korean Applied Science and Technology
• /
• v.24 no.2
• /
• pp.160-166
• /
• 2007

The rheological properties and surface tensions of polymer solutions and polymer-surfactant mixed solutions were investigated. The polymers used in this study were a homopolymer of acrylic acid crosslinked with an allyl ether of pentaerythritol, an allyl ether of sucrose, or an allyl ether of propylene (CARBOMER), acylate/C10-30 alkyl acylate crosspolymer (AAAC), and ammonium acryloydimethyltaurate/VP copolymer (ADTV). A solubilizing agent PEG-40 hydrogenated castor oil (HCO-40) and an emulsifying agent polyoxyethylene (20) sorbitan monostearate (POLYSORBATE 60) made the micelles intervening between AAAC polymers, resulting in the increase of viscosity. However, HCO-40 made this behavior over the wider range of surfactant concentration than POLYSORBATE 60. From the view point of surface tensions in the same range of surfactant concentration, AAAC/HCO-40 solution showed the area of increasing surface tension with surfactant concentration in contrast to the AAAC/POLYSORBATE 60 solution showing no increasing area.

• International Journal of Advanced Culture Technology
• /
• v.8 no.3
• /
• pp.1-9
• /
• 2020

According to the 2012 social blue book released by the Chinese Academy of Social Sciences, China's urban population reached 50% in 2011. With the migration from marriage and new household registration, many urban collective assets have been formed in cities. Due to the unclear property rights and the emptiness of the main body, the distribution of collective assets mostly depends on the village cadres. The central government is preparing relevant laws and regulations to fill this legal gap, while the scheme of restructuring is decided by the villagers' vote, the local government coordinate the land acquisition and management. With the process of urbanization, a large number of second-generation of demolition studied abroad, which has attracted worldwide attention. In addition to the huge amount of compensation, due to the continuous rising of the land price, the value of the collective property and enterprises on the land also keep rising, the management agency of these assets is named village economic cooperative. This paper seeks to analyze the current status and future direction of these wealthy organizations, propose solutions to some existing problems.