• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.371-377
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• 2004

In an effort to simplify, standardize, and make effective use of information on arrival／departure through electronic means developed up to now, this paper suggests ebXML based Global Port B2B Framework, which makes it possible not only to realize e-commerce transactions between ports, but also simultaneously realize standardization and integration. In addition, due to its reusability of information, various reports are to be simplified and automated

• Journal of Navigation and Port Research
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• v.29 no.5 s.101
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• pp.439-445
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• 2005

Recently, owing to the increasing demand on the simplification of arrival and departure procedures, IMO's (International Maritime Organization) Facilitation Committee (FAL) is carrying out the standardization project of arrival and departure formalities and clearance form. Also, many port authorities of developed countries are making active researches for the smooth flow and efficiency of the information inbound and outbound ships by way of simplifying their formalities or through electronic means. However, this standardization project cannot be done by one country but by mutual cooperation among related nations. And to carry out this task, the first thing to be done is to standardize the formalities and document form, and to integrate information. To this end, this study has reviewed the model cases of advanced ports of developed countries with regard to their simplification and standardization efforts. And also we have analyzed the formalities and clearance form of the three countries Korea, China, and Japan. And then for the solution of common problems of three countries, this paper has suggested an ebXML-based Global Port B2B framework. Through this framework, we can reuse and automate the necessary information on the arrival and departure of ships, consequently realizing simplification, and laying a foundation for the introduction of e-commerce to the port industry.

• Nuclear Engineering and Technology
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• v.13 no.1
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• pp.12-21
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• 1981

An extension work of the previous paper on the rewetting velocity model is presented. Application of the rewetting velocity model presented elsewhere requires a priori values of ø. In the absence of ø values, film boiling heat transfer coefficient ( $h_{df}$ ) and fog-film length (ι) data are needed. To provide these informations, a modified Bromley's correlation is first derived and used to obtain $h_{df}$ values at higher pressure conditions. In addition, the analysis of the precooling parameters, such as ø and ι is further extended using much more expansive PWR FLECHT data. Thus, the applicable range of the rewetting velocity model is further expanded in this work.

• Journal of Information Management
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• v.14 no.4
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• pp.165-169
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• 1981

• 발명특허
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• v.11 no.9 s.127
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• pp.8-9
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• 1986

• Landscaping Tree
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• s.110
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• pp.23-27
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• 2009

국내에서 "마로니에"라는 이름으로 보다 잘 알려져 있는 "칠엽수"는 손가락을 닮은 작은 잎이 일곱 장씩 달린다 하여 붙여진 이름이다. 실제 국내에서 칠엽수라 하여 가로수나 공원 등지에 식재되는 식물들은 대부분 일본 원산의 Aesculus trubinata이다. Aesculus의 영명은 Horse Chestnut(말밤) 또는 Buckeye라고 불리는데, 이는 밤같이 생긴 열매를 말이 좋아하여 사료용으로 쓰여 진데서 유래되었다.

• Journal of Korean Society of Transportation
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• v.23 no.7 s.85
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• pp.181-190
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• 2005

The time required for airport process is considered more important as the airports are becoming bigger. International Civil Aviation Organization mattes this international standards and recommends not to exceed it. The passenger forecasting model is developed to predict the number of passengers at the check-in counter, and the area of formalities for departure and entry. In case of forecasting the number of outbound-passengers. the patterns of show-up lead time(SLT) at the check-in counter and lag time from check-in counter to the area of departure formalities are modeled in terms of time. On the other hand, the matter of the choice of check-in counters and areas of departure formalities are modeled in terms of space. In case of forecasting the number of inbound-passengers and transfer passengers, the time of airplane movement from arrival to block on at the gate and the time of passengers required from gate to the area of formalities for entry are modeled in terms of time. While the matter of the choice of gates and the areas of formalities for entry are modeled in terms of space. The average error of forecasting outbound-passengers and inbound-passengers is respectively 15% and 10%, which are considered excellent with the 5% error of passenger reservation information as input data. Through the development of passenger forecasting models, we assure we could provide passengers with valuable service because we allocate resource such as employees and equipments according to the degree of concentration of passengers.

• Resources Recycling
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• v.29 no.6
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• pp.104-113
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• 2020

Bubble size in froth flotation has long been recognized as a key factor which affects the bubble residence time, the bubble surface area flux (Sb) and the carrying rate (Cr). This paper presents method of bubble size measurement, relationship between operating variables and gas dispersion properties in flotation column. Using high speed camera and image analysis system, bubble size has been directly measured as a function of operating parameters (e.g., superficial gas rate (Jg), superficial wash water rate (Jw), frother concentration) in flotation column. Relationship compared to measured and estimated bubble size was obtained within error ranges of ±15~20% and mean bubble size was 0.718mm. From this system the empirical relationship to control the bubble size and distribution has been developed under operating conditions such as Jg of 0.65~1.3cm/s, Jw of 0.13~0.52cm/s and frother concentration of 60~200ppm. Surface tension and bubble size decreased as frother concentration increased. It seemed that critical coalescence concentration (CCC) of bubbles was 200ppm so that surface tension was the lowest (49.24mN/m) at frother concentration of 200ppm. Bubble size tend to increase when superficial gas rate (Jg) decreases and superficial wash water rate Jw and frother concentration increase. Gas holdup is proportional to superficial gas rate as well as frother concentration and superficial wash water rate (at the fixed superficial gas rate).

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.299-300
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• 2009

The purpose of this study is analysis on properties of water absorption and chloride penetration according to moisture content in cement mortar.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.237-238
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• 2001

라돈(Rn-222)은 우라늄(U-238) 방사능계열의 원소로서 라듐(Ra-226)의 알파($\alpha$)붕괴시 자연생성되는 가스상 물질이다. 암석 내에서 생성되어 공극내에서 물에 용해된 라돈은 붕괴하지 않고 상태를 유지하게 되는데 이런 라돈이 존재하는 암석층으로부터 지하수를 취수할 경우, 상당량의 라돈이 지하수속에 용해되어 있을 수 있다. 이렇게 용해된 상당량의 라돈은 실내공기로 휘발하면서 주변으로 확산하게 된다. (중략)