• Journal of the Korean Institute of Gas
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• v.22 no.5
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• pp.114-123
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• 2018

As recognizing the necessity of eco-friendly vehicles in order to reduce air pollution from road sector, Korean government has established and implemented a promotion policy which is encouraging the public transportation companies to purchase CNG buses in replacing diesel buses since 2000s. With CNG bus promotion policy, the number of CNG buses had been increased on the road of metropolitan area and big cities. However, increasing rate of CNG buses had been fluctuated between the decrease and the increase since year 2014. In this study, the impact of fuel cost competitiveness between diesel and CNG on CNG bus increasing volume was testified by simple regression, which was only assumed by precedent research on the CNG promotion policy. And this study suggested the necessity of harmonization among the related policies conducted by related Ministries. Eventually this study should contribute to enhance the validity of CNG bus promotion policy. And it is expected that Korean government should apply the new policy suggestion of this study in the establishment of government's promotion policy on LNG cargo trucks and Zero Emission Vehicles in the future.

• The Korean Journal of Applied Statistics
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• v.28 no.4
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• pp.807-826
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• 2015

Generational contracts are specified into public pensions based on generational solidarity. The Korean National Pension has been reformed with a focus on generational equity with a narrow meaning related to contribution rate and benefit level. As a result, the Korean National Pension has only emphasized generational equity and not contributed to generational solidarity. We investigate changes in the content of the generational contract and propose to reconstruct generational contract to contribute to solidarity with a more comprehensive perspective. A new social contract by reformed pension system should not concentrate on narrowed generational equity. It should be reconstructed in the direction of enhancing efficacy and the stability of generational solidarity with an emphasis on social sustainability. Investment into the next generation would be one of many policy measures to decrease conflicts around intergenerational redistribution and improve the financial stability of the public pension by creating population structure and labor market changes.

• Korean Journal of Community Nutrition
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• v.10 no.3
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• pp.264-270
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• 2005

Breastfeeding has been known as the best feeding practice to prevent allergies including atopic dermatitis (AD) However, the benefit on the prevention of allergic disease is still controversial. The objectives of this study were to examine the rate of sensitization to the protein of eggs, cow's milk and soy in exclusively breastfed infants and to evaluate antigen-antibody reaction between breast milk and serum of AD infant. Data on feeding and food hypersensitivity were obtained for 62 AD infants (32 male, 30 female) aged < 6 month who had visited Samsung Medical Center from September 2001 to May 2003. Food hypersensitivity was determined by measuring specific IgE to egg, cow's milk and soy. Specific IgE levels > 0.7 kU/L by CAP assay (Pharmacia, Uppsala, Sweden) were considered positive. The rates of sensitization in breastfed infants were $41.9\%$ (26/62) to egg, $30.6\%$ (19/62) to milk and $18.0\%$ (11/62) to soy. Immunoblotting analyses were performed using breast milk with the matched serum of seven AD infants (4 male/3 female). Binding patterns of AD infant's IgE to breast milk extract showed visible specific band for immunoglobulin, especially in case of a lactating mother who did not completely restricted ingestion of egg, milk and soy. These results indicate that sensitization to food allergen develops via breast milk feeding. Breast milk feeding should be recommended in infants at risk of developing allergic disease, but maternal intake of highly allergenic food might be restricted for prevention and treatment of food allergy among the babies with AD.

• Research in Community and Public Health Nursing
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• v.9 no.2
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• pp.313-323
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• 1998

This study is to develop the model on the joint employment system of occupational health nurse practitioners for medium or small sized enterprises in Korea based on the comparison opinions between employers and occupational health nurses (OHN). The data were collected by questionnaires from Oct. to Nov. in 1997. The number of subjects was 210 OHNs and 176 employers, response rate was 47.1% for OHNs and 23.2% for employers. The SAS PC program was used for the descriptive statistics. The results were as follow: 1. More than three years career was preferred for qualification of OHN by employers and OHNs. OHNs preferred that all instruments and materials should be equipped in each industry, but employers preferred that they should be equipped by OHN. 2. For the limit number of industries and employees per one OHN, employers preferred average 2.25 industries and 307 employees, OHNs preferred average 3.0 industries and 448 employees. Both of them preferred two times visit per week for all day long. 3. OHNs wanted that the local office of Ministry of Labor could act as mediator, but employers preferred direct contact individually. For the average wage, employers preferred 887,000 won per month, but OHNs preferred 1,960,000 won per month. 4. OHNs preferred the Korean Association of Occupational Health Nurse as the recruit agency. Finally, employers and OHNs have the opinions that they can choose this system depending on the condition. There is in need of development of effective strategy for this new system such as manpower development, cost-benefit analysis, establishment of occupational health service standard, advertisement for employers, and government supported project.

• Asian-Australasian Journal of Animal Sciences
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• v.26 no.11
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• pp.1630-1636
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• 2013

An investigation was carried out to assess the carcass characteristics and meat quality aspects of immunocastrated male pigs of medium genetic potential for lean meat deposition in carcass (53 to 55%). When the crossbred Large White x Landrace pigs (n = 45) were 70 days old, they were distributed in a totally randomized design in three treatments (castrated males, females and immunocastrated males) with three replicates of five animals. The pigs were slaughtered when they were 140 days old. Carcass temperature and pH were recorded twice, at 45 min and 24 h after slaughter. The carcasses were evaluated for hot and cold carcass yield, commercial cuts yield, length and depth, back fat thickness, loin eye area and lean meat percentage. The Longissimus dorsi muscle was extracted for analysis of color ($L^*$, $a^*$, $b^*$), exudate loss, cooking loss and centesimal and sensorial analysis of the meat. There were no significant differences for the evaluated parameters between castrated males, immunocastrated males and females, except for backfat thickness between the 7th and 8th thoracic vertebra and the point P2 (lower for immunocastrated males) and carcass temperature at 45 min post slaughter (higher in immunocastrated males), however, this did not interfer with the rate of pH decrease post mortem and the meat quality. The results from this research did not indicate a benefit of immunocastration on carcass characteristics of pigs of medium genetic potential for lean meat deposition in carcass, when compared to surgical castration.

• Korean Journal of Clinical Pharmacy
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• v.11 no.1
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• pp.1-6
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• 2001

This research is conducted to evaluate the clinical and economic benefits from therapeutic drug monitoring(TDM) service on vancomycin in a tertiary general hospital. Total 99 pairs of steady state peak and trough concentrations of vancomycin were obtained from 73 patients. To see the clinical benefits, the appropriateness of vancomycin dosing before TDM was evaluated. In 72 pairs of vancomycin blood concentrations obtained prior to TDM consultation, $47.2\%$ of the cases had reached within therapeutic range. Serum vancomycin levels in patients with $40{\leq}CLcr<60$ (ml/min) were higher and than the levels in patients with 40>CLcr and $60{\leq}CLcr$ (ml/min). Dose reduction rate in patients with creatinine clearance $40{\leq}CLcr<60$ (ml/min) were also significantly higher than those of compared groups ($61.5\%$, p=0.0138). Serum vancomycin concentrations were re-obtained from 21 patients who received modified dose through TDM service. Ninety percent (19/21cases) of them were within the target therapeutic range. For the evaluation of economic benefits from TDM consultation, estimated cost savings were calculated in those patients. The total drug saving were 586 vials in 21 patients. The calculated mean cost saving from the drugs was 314,570 won (range: $11,273\sim473,466)$ per patient. The study revealed that TDM service for vancomycin is necessary because empirical dosing is not effective for obtaining therapeutic drug level, especially patients with mild renal insufficiencies. The cost saving from TDM is also beneficial for the patients.

• Journal of Korean Society of Disaster and Security
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• v.5 no.1
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• pp.1-6
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• 2012

This study analyzed the direct costs of fall accidents, which have the highest accident rate, for domestic construction industry workers. Firstly, the average insurance payment per person due to fall accidents in the construction industry is around 19 million won (18,971,000 won). Given that the average number of workers suffering fall accidents over ten years is 5,863, the total cost of losses from fall accidents is about 1.1 trillion won (111,360,000,000 won). Secondly, a cost-based economic feasibility analysis was done to develop nonstructural preventive measures for fall accidents. Since there was no data expressing the costs and effects of preventive measures in terms of monetary value, the economic feasibility analysis was attempted with a focus on how much the newly introduced preventive measures can reduce the accident loss costs due to fall accidents. Thirdly, if the accident loss size is grasped and the preventive measures for the causes of fall accidents are developed and strictly implemented, the insurance fee that can reduce the accident loss costs can be determined. Further study is needed to estimate the benefit of the accident loss cost reduction seen from the cost-based approach method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.1
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• pp.62-77
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• 2010

Emerging applications with high data rates will need to transport bulk data reliably in wireless sensor networks. ARQ (Automatic Repeat request) or Forward Error Correction (FEC) code schemes can be used to provide reliable transmission in a sensor network. However, the naive ARQ approach drops the whole frame, even though there is a bit error in the frame and the FEC at the bit level scheme may require a highly complex method to adjust the amount of FEC redundancy. We propose a bulk data transmission scheme based on erasure-resilient code in this paper to overcome these inefficiencies. The sender fragments bulk data into many small blocks, encodes the blocks with LT codes and packages several such blocks into a frame. The receiver only drops the corrupted blocks (compared to the entire frame) and the original data can be reconstructed if sufficient error-free blocks are received. An incidental benefit is that the frame error rate (FER) becomes irrelevant to frame size (error recovery). A frame can therefore be sufficiently large to provide high utilization of the wireless channel bandwidth without sacrificing the effectiveness of error recovery. The scheme has been implemented as a new data link layer in TinyOS, and evaluated through experiments in a testbed of Zigbex motes. Results show single hop transmission throughput can be improved by at least 20% under typical wireless channel conditions. It also reduces the transmission time of a reasonable range of size files by more than 30%, compared to a frame ARQ scheme. The total number of bytes sent by all nodes in the multi-hop communication is reduced by more than 60% compared to the frame ARQ scheme.

• ALGAE
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• v.29 no.3
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• pp.203-215
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• 2014

As global warming continues over the coming century, marine organisms will experience a warmer, more acidic ocean. Although these stressors may behave antagonistically or synergistically and will impact organisms both directly (i.e., physiologically) and indirectly (i.e., through altered species interactions), few studies have examined the complexities of these effects in combination. To address these uncertainties, we examined the independent and combined effects of elevated temperature and $pCO_2$ on the physiology of the adult sporophyte stage of giant kelp, Macrocystis pyrifera, and the grazing of the purple sea urchin Strongylocentrotus purpuratus. While elevating $pCO_2$ alone had no effect on M. pyrifera growth or photosynthetic carbon uptake, elevating temperature alone resulted in a significant reduction in both. However, when M. pyrifera was grown under elevated temperature and $pCO_2$ together, growth and photosynthetic carbon uptake significantly increased relative to ambient conditions, suggesting an interaction of these factors on photosynthetic physiology. S. purpuratus held under future conditions generally exhibited reduced growth, and smaller gonads than urchins held under present-day conditions. However, urchins fed kelp grown under future conditions showed higher growth rates, partially ameliorating this effect. Feeding rates were variable over the course of the experiment, with only the first feeding rate experiment showing significantly lower rates for urchins held under future conditions. Together, these data suggest that M. pyrifera may benefit physiologically from a warmer, more acidic (i.e., higher $pCO_2$) ocean while S. purpuratus will likely be impacted negatively. Given that kelp-urchin interactions can be important to kelp forest structure, changes to either of these populations may have serious consequences for many coastal environments.

• Journal of Environmental Science International
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• v.19 no.8
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• pp.983-999
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• 2010

Wind power energy is one of the favorable and fast growing renewable energies. It is most important for exact analysis of wind to evaluate and forecast the wind power energy. The purpose of this study is to improve the performance of numerical atmospheric model by data assimilation over a complex coastal area. The benefit of the profiler is its high temporal resolution and dense observation data at the lower troposphere. Three wind profiler sites used in this study are inhomogeneously situated near south-western coastal area of Korean Peninsula. The method of the data assimilation for using the profiler to the model simulation is the three-dimensional variational data assimilation (3DVAR). The experiment of two cases, with/without assimilation, were conducted for how to effect on model results with wind profiler data. It was found that the assimilated case shows the more reasonable results than the other case compared with vertical observation and surface Automatic Weather Station(AWS) data. Although the effect of sonde data was better than profiler at a higher altitude, the profiler data improves the model performance at lower atmosphere. Comparison with the results of 4 June and 5 June suggests that the efficiency with hourly assimilated profiler data is strongly influenced by synoptic conditions. The reduction rate of Normalized Mean Error(NME), mean bias normalized by averaged wind speed of observation, on 4 June was 28% which was larger than 13% of 5 June. In order to examine the difference in wind power energy, the wind power density(WPD) was calculated and compared.