• Asian-Australasian Journal of Animal Sciences
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• v.32 no.1
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• pp.110-117
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• 2019

Objective: An experiment was conducted to evaluate the effects of dietary glutamine (Gln) and arginine (Arg) supplementation on performance, intestinal morphology and ascites mortality in broilers. Methods: A total of 675 day old chicks were randomly allocated to 9 experimental groups in a $3{\times}3$ factorial arrangement based on a completely randomized design with 5 replicates of 15 chicks. Three levels of dietary Gln (0%, 0.5%, and 1%) and Arg (100%, 130%, and 160% of Ross recommendation) supplementation were used in ascites inducing condition ($15^{\circ}C{\pm}1^{\circ}C$) from 7 to 42 days of age. Results: Dietary supplementation of Gln increased body weight gain during grower, finisher and total periods (p<0.05) and increased feed intake during total period. Ascites mortality was decreased by Gln supplementation (p<0.05). Gln supplementation increased the villus height (VH) and crypt depth (CD) in duodenum and jejunum (p<0.05). Arg supplementation decreased CD in duodenum and jejunum, and increased ileum villus width (VW) and also VH/CD ratio in duodenum and jejunum (p<0.05). Both Gln and Arg increased the goblet cell number (GCN) in duodenum whereas Gln supplementation decreased GCN in jejunum and ileum (p<0.05). The $Gln{\times}Arg$ interaction were observed for right ventricle (RV)/total ventricular (TV) ratio, VH, VW, CD, VH/CD. Conclusion: It was concluded that dietary 0.5% Gln alone or along with 130% Arg of Ross requirement, improve the intestinal morphology and performance and hence decrease the ascites mortality in broiler chickens with cold induced ascites.

• Tribology and Lubricants
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• v.36 no.6
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• pp.385-390
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• 2020

It rains heavily, such as long rain and typhoons, during a typical rainy season in Korea. In this season, several fuel contamination accidents by water and vehicular problems caused by water contaminated fuel occur. Many research groups have studied the effects of water contaminated fuel on vehicles and environment. However the characteristics of water contaminated fuel have not been studied. In this study, we prepared diesel samples with a constant ratio of water (0~30 volume %) using an emulsifier. Then, we analyzed these diesel samples for their representative fuel properties. In the analytical results, diesel with 30% water showed an increase in fuel properties such as density (823→883 kg/㎥), kinematic viscosity (2.601→6.345 ㎟/s), flash point (47→56℃), pour point (-22→2℃), CFPP (cold filter plugging point) (-17→20℃) and copper corrosion number (1a→2a). The low temperature characteristics, such as low pour point and CFPP, blocks the fuel filter in the cold season. In addition, water contaminated diesel decreases lubricity (190→410 ㎛) under high frequency reciprocating rig (HFRR) and derived cetane number (54.81→34.25). The low lubricity of fuel causes vehicle problem such as pump and injector damage owing to severe friction. In addition, the low cetane diesel fuel increases exhaust gases such as NOx and particulate matters (PM) owing to incomplete combustion. This study can be used to identify the problems caused by water contamination to vehicle and fuel facilities.

• Fashion & Textile Research Journal
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• v.22 no.6
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• pp.844-852
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• 2020

This study is to understand the preferences of pilots, flight engineers and crew who work in the same aircraft but are exposed to different working environments and perform different mission operations in order to develop an ergonomic flight jacket. Based on a preliminary investigation, a survey of 107 pilots and 36 flight engineers and crew was conducted. The results are as follows; Pilots can control the temperature inside the cockpit, so they are less exposed to the cold when working, while flight engineers and crew are exposed to the cold more because they have many external tasks. The reason for the problem of the current flight jacket was a difference in ranking between two groups, but the highest ranking was poor dimensional suitability due to the habit of wearing layers of clothing. As a result of preferred design, there were significant differences between groups in the item of overall style. Pilots preferred a bomber jacket style(P:68.2%, E&C:44.4%), on the other hand, flight engineers and crew preferred a field jacket style(P:26.2%, E&C:55.6%)(p<.01). They preferred a stand collar(P:71.0%, E&C:86.1%), a fastener slider for a front fastening(P:62.6%, E&C:61.1%), fastener tape cuffs(P:54.2%, E&C:47.2%), a jacket with a softshell(P:86.9%, E&C:83.3%), fleece as softshell material(P:88.8%, E&C:69.4%), and fastener sliders as a attaching method(P:69.2%, E&C:61.1%). A hem fastening will be selected differently according to the overall style of outshell. Additionally, they preferred more than 5ea pockets(P:51.4%, E&C:44.4%), fastener sliders as pocket's fastenings(P:48.6%, E&C:61.1%), armpit ventilations(P:62.9%, E&C:58.5%). The results of above will be considered to design an ergonomic flight jacket.

• The Korea Journal of Herbology
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• v.29 no.1
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• pp.27-33
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• 2014

Objectives : This study was carried out to identify DNA markers of "Allium sativum" be circulated from Korea and China, which is difficult to discriminate from morphological characters because of fragmental materials of bulb. That is, all these studies focused on the discrimination of Allium sativum L. But these day, Chinese A. sativum was in circulated Korean A. sativum in Korean medicine markets. Therefore, the purpose of our study was to develop molecular markers for discrimination between Korean A. sativum and imports from China. Methods : Materials were collected randomly from a markets in Korea and China and be analyzed with matK, ndhF and trnL-F regions of chloroplast DNA (cpDNA). We collected 45 A. sativum individuals from Korean and Chinese medicine markets, in 2013. Results : As a results, matK and ndhF regions of cpDNA was shown to be identify, Species that grow from warm place and cold place can divide as five SNP (Single nucleotide polymorphisms) markers in matK and ndhF genes. Also, in trnL-F regions, found one SNP that can divide Korean A. sativum and Chinese A. sativum. Conclusions : From the analysis of matK and ndhF regions of cpDNA, we presumed that three markers of cpDNA were found by useful marker that can distinguish Korean, Chinese, Warm place type, and Cold place type. Individual differences of Korean and Chinese was thought that appear in geographical difference and genetic difference by environment for long hour even if same species.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.33 no.3
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• pp.317-331
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• 2023

Objectives: Construction workers are exposed to various hazardous substances simultaneously. However, little is known about the exposure hazards in construction industry. This study was aimed at identifying the risk of exposure hazards among construction workers. Methods: The expert survey (n=29) was conducted, including construction industry health managers (n=11) and work environment monitoring experts (n=18), on exposure probability, intensity and risk of hazardous substances by construction occupations Results: The exposure hazards of 30 construction occupations were identified and summarized through a literature review and expert survey. The most prevalent hazards were in order of noise, awkward posture, heat/cold, crystalline silica, cement/concrete dust, metal fumes, and volatile organic compounds. The hazards with highest risk score(over seven points) at construction occupations were noise(formwork carpenter, concrete finisher, rebar worker, demolition worker, driller/rock blaster), hazardous rays(welder), heat/cold (earthworks, formwork carpenter, rebar worker, concrete placer, scaffolder), awkward posture(bricklayer, caulker/tile setter, rebar worker) and heavy lifting(bricklayer, rebar worker). Among construction workers, the job types with the highest risk of exposure to carcinogens, and in which occupational cancer has been reported, were in order of stonemason, concrete finisher, rock blaster, welder, insulation installer, painter, scaffolder, plant worker and earthworks in order Conclusions: Systematic research and discussion on occupational disease among construction workers and its various hazardous factors are needed to establish job exposure matrix for facilitating standard for promptly processing the workers' compensation.

• Korean journal of applied entomology
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• v.62 no.3
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• pp.213-214
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• 2023

In a paper reporting the introduction and settlement of Anoplophora horsfieldii (Hope) into Jeju, it was found that Bactrocera dorsalis (Hendel) was misquoted as "it was introduced into the Jeju area and is currently being discovered." Fortunately, the sentence was quickly discovered and corrected to "it has the potential to be introduced to Jeju Island". Taking this as an opportunity, we would like to emphasize to researchers that it is necessary to verify very carefully when describing the domestic distribution of prohibited quarantine pests. Estimating by the cold stress index of the CLIMEX model, B. dorsalis was predicted to be unable to survive in Jeju in the winter of 2022-2023. However, in the winter of 2023, it was confirmed that the occurrence of A. horsfieldii was found to occur in the summer after overwintering at sub-zero temperatures, and it was judged to have succeeded in settling.

• Korea Trade Review
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• v.47 no.6
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• pp.119-134
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• 2022

A new protectionism caused by the US-China competition and a following new Cold War would have a negative impact on global FDI. In this time, this study researched the effects of the long lasting global openness and liberalization on Korea's Inward FDI. 1,387 foreign invested companies in Korea were analyzed. The results are summarized as follows. First, Korea's FDI has been expanded under the environment of globalization. The IFDI amount and share in GDP increased. Seven countries out of the world top 10 were listed in Korea' the top 10. However, the share of the US and Japan's FDI in Korea's IFDI decreased. Second, non-manufacturing industry became prevalent in Korea's IFDI. Considering it's local market-oriented characteristics, the biggest investment motivation by global companies was Korean market pursuit. The US was more local market-oriented than Japan. Third, cross-border M&A, which became active in developed countries since 1980s, also kicked off in Korea from late 1990s. Global companies managed foreign-invested companies in Korea with shares close to wholly owned. The US had higher share ratios than Japan. The implications by this research are as follows. First, looming protectionism by a New Cold War would negatively affect Korea's IFDI through the adverse function of globalization. Second, Korea's IFDI has been converted to a market pursuit type being mainly leaded by non-manufacturing industry. Since GDP is the largest FDI motive in this type of FDI, the key policy for IFDI promotion is lying in the expansion of domestic market rather than deregulation.

• 제어로봇시스템학회:학술대회논문집
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• 1997.10a
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• pp.684-687
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• 1997

In order to access to the Business Computer (B/C), the Process Computer(P/C), and the Database Server in one terminal, the Open Man Machine Interface (MMI) System has been developed. The testbed to develop the interface functions for B/C, P/C, DB server, and CCD camera were constructed, which consisted of Workstations and Personal Computers (PC). Graphic display programs Monitoring the process states of Tandem Cold Mill plant were developed using four Graphic User Interface tools: InTouch, FIX32, Open Interface Environment, and ILOG Views. With regard to the CPU utilization and response delay required to open new display, the performance tests have been carried out on each MMI platform.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.17-17
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• 2018

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.133-133
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• 2018