• Mass Spectrometry Letters
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• 제11권4호
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• pp.77-81
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• 2020

Characterization of the various chemical aspects of composite polymers is important for quality control of manufactured polymers. In this study, we compared three suitable matrices (α cyano-4-hydroxycinnamic acid [CHCA], 2,5 dihydroxy benzoic acid [2,5-DHB], and dithranol), to characterize various synthetic polymers by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Although the spectra obtained with the CHCA and 2,5-DHB matrices were generally good, in certain samples ghost peaks disappeared only when dithranol was used as the matrix. Furthermore, we examined the use of sodium trifluoroacetate (NaTFA) as an additive to reduce interference by metals and copolymers in the spectra. In conclusion, appropriate selection of a matrix, according to the characteristics of the polymer, and the use of additives to improve sensitivity are important considerations for polymer analysis and development.

• International Journal of Automotive Technology
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• 제6권4호
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• pp.333-340
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• 2005

In order to better quantify the contribution from nonroad sources to emission inventories, it is important to understand not only the emissions rates of these engines but also activity patterns that can be used to accurately portray their in-use operation. To date, however, very little information is available on the actual activity patterns of nonroad equipment. In this study, a total of 18 pieces of nonroad equipment were instrumented with collected data including intake manifold air pressure (MAP), exhaust temperature and, on a subset of vehicles, engine rpm and throttle position. The equipment included backhoes, compactors, dozers, motor graders, loaders and scrappers used in applications such as landfilling, street maintenance and general roadwork. The activity patterns varied considerably depending on the type of equipment and the application. Daily equipment operating time ranged from less than 30 minutes to more than 8 hours, with landfill equipment having the highest daily use. The number of engine starts per day ranged from 3-11 lover the fleet with an average of 5 starts per day. The average percent idle time for the fleet was approximately $25\%$ with a range from 11 to $65\%$ for individual pieces of equipment. Duty cycles based on exhaust temperature/throttle position profiles were also developed for two graders and one dozer.

• 한국안전학회지
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• 제38권3호
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• pp.110-120
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• 2023

Following the Fukushima accident, portable equipment employed as accident mitigating systems have been installed and operated to reduce core damage and large early release frequencies. In addition, the establishment of an accident management strategy has gained importance. This study investigated the current status of portable equipment including the international portable equipment FLEX (diverse and flexible coping strategies), and domestic portable equipment multi-barrier accident coping strategy (MACST). Research on optimal utilization of MACST remains insufficient. As a preliminary study for establishing an optimal strategy, sensitivity studies were conducted to facilitate the priority of use on portable equipment, number of portable equipment, and dependency of operator actions based on a multi-unit probabilistic safety assessment model. The results revealed the conditions that reduced the multi-unit and site conditional core damage probabilities, indicating the optimal strategy of MACST. The results of this study can be used as a reference for establishing an optimal strategy that utilizes domestic safety equipment in the future.

• 교육시설
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• 제13권3호
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• pp.6-16
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• 2006

The purpose of the study is on offer present condition of School Facilities for Local Residents in Daegu City. This study made progress within the scope of twenty-four public schools excepting one private school and five schools refused request. but opening present condition of the equipment was stopping in negative opening more than thing that is seen in present condition(to be a hall, a computer, swimming pool, physical education market, clearinghouse, art thread, library, language study thread) of two locals that show in old research. As result that diagnose this research, The school facilities open every schools excepting three schools could not open on account of establishment of sprinkler, residents protest about noise, small playground. The opening equipment was limited the playground, hall, basketball court, Badminton court, parking lot, classroom, library. And The use present condition was used by parking, walk, jogging and light exercise, basketball, badminton, state examination, sports meeting, books inspection, early stage soccer. When local residents require equipment use, it is not negative attitude in school but have active carriage. and Must consider plan that raise practical use degree so that can use school equipment.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1993년도 추계학술대회논문집
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• pp.15-19
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• 1993

Numerous motivational methodologies were analyzed with respect to improvement of the use of personal protective equipment (PPE) in the industrial field. Common industrial protective devices under consideration included hearing protection devices, respiratory protection devices, eye and face protection devices, etc. It was found that several of such methods could readily be implemented in the real world to protect workers from hazardous industrial sterssors, such as intense noises, toxic air contaminants, and other dangerous industrial objects (e,g., chemicals). Current research issues and recommendations for future research are addressed.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.1328-1334
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• 2015

A new system for evaluating the voltage management errors of distribution equipment is presented in this paper. The main concept of the new system is to use real distribution live-line voltage to evaluate and correct the voltage measurement data from distribution equipment. This new approach is suitable for a new Distribution Management System (DMS) which has been developed for a distribution power system due to the connection of distributed generation growth. The data from distribution equipment that is installed at distribution lines must be accurate for the performance of the DMS. The proposed system is expected to provide a solution for voltage measurement accuracy assessment for the reliable and efficient operation of the DMS. An experimental study on actual distribution equipment verifies that this voltage measurement accuracy assessment system can assess and calibrate the voltage measurement data from distribution equipment installed at the distribution line.

• 한국항해항만학회지
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• 제35권9호
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• pp.707-715
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• 2011

To propose an ergonomic layout on the bridge, this study conducted a usability evaluation on the on-bridge navigational equipment of a college training ship that is in use at present. Through the usability evaluation on the training ship navigators, the possibility of operational errors with navigational equipment, the possibility of readout errors with display devices and even the effect of navigational equipment on navigation were evaluated beyond the scope of existing layouts, which adopt only the importance and usage frequency of navigational equipment. By taking ergonomic variables into consideration, this study suggested an optimized layout for on-bridge navigational equipment using a mathematical programming model.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.359-362
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• 2008

Middle domestic the occurrence size which stews recently from the Korean Peninsula circumference country is augmenting on a large scale about earthquake about safe countermeasure part from the existing Natural Countermeasure Law 2008. Refers with the Earthquake Disaster Countermeasure Law to be new standard contents establishment by law and strengthened in March. Consequently the research is propelled about electric equipment earthquake-proof plan and countermeasure. The present paper investigated an equipment by domestic facility present condition about the change disappointment electric equipment which can supply all the member in the building an investigation analysis about problem point and improvement fact. Also about overseas electric equipment investigated about earthquake-proof plan relation system and facility present condition. Investigated the electric equipment earthquake-proof plan pertinent data which is advanced from like this existing nation and the equipment and application direction must apply to domestic presented. With character presents following the guide about electric equipment earthquake-proof plan becomes feed with the fact that will be able to use.

• 한국건설안전학회 논문집
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• 제4권1호
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• pp.9-15
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• 2021

최근 건축물이 대형화, 복합화되고 다양한 공법들이 시도되고 있다. 이에 건설장비 사용이 지속적으로 증가하고 있는 것은 물론, 그에 따른 안전사고도 지속적으로 증가하고 있다. 고용노동부 산업재해현황 발표자료에 따르면 건설업 사망사고 중 건설장비로 인한 사망사고 비율이 2009년부터 지속적으로 증가해오고 있는 실정이다. 범죄·교통 등 타산업의 안전분야에서는 평가지표 개발 또는 위험 지수 개발의 요구가 있어 정량적인 지수를 개발하는 연구가 지속적으로 연구가 진행되어 왔다. 반면에 건설장비는 재해사례를 분석하여 개선대책을 도출하는 연구는 되고 있으나, 위험 지수와 관련된 연구는 부재한 실정이다. 이에 본 연구에서는 사고사례를 기반으로 현장의 건설장비 위험 수준을 선행적으로 판단할 수 있는 정량적 지수를 개발하고, 현업에 활용 가능성도 확인해 보고자 한다.

• 한국주거학회논문집
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• 제12권4호
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• pp.105-113
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• 2001

This research indicates to controversial point that store equipments were not applying correct development factor in the each apartment house by that change rate by scale and uniformity of form and inefficiency, effect of discount store is increasing in apartment house and progressed research. The result are as follows; First, interior main point of store of that influence greatly to change rate number of store be. Second, being lot area in jar in outside factor of store. Third, discount store separation appeared by leading person who influence greatly to change rate in middle who is contiguity market singleness residential quarter and contiguity existence of commercial district and nonexistence and discount store separation of only outside right near at hand. Construction of commerce equipment may have to consist in practical apartment house after examine various kinds factor such as store indoor, store outside and only outside while plan practical use of systematic and efficient commerce equipment focusing more in efficient utilization of commerce institution that consist after plan that is not planed commerce equipment focusing in development in plan of commerce equipment in apartment house hereafter accordingly.