• 한국공간구조학회논문집
• /
• 제18권1호
• /
• pp.93-100
• /
• 2018

The retractable roof structures have actions of various types of loads and external forces depending on the retraction and operation conditions of the roof in terms of efficiency of control and maintenance as the aspect of structural plan. In particular, there is a need for studies on the establishment of retraction controlled wind velocity to maintain the stable control and usability of roof structure against strong winds or sudden gusts during the retraction of the roof. In this paper, it was intended to provide basic materials for the development of guidelines on the operation and maintenance of domestic retractable buildings with large space by analyzing the factors affecting the retraction controlled wind velocity for the overseas stadiums with the large spatial retractable roof structures where the sliding system was applied on the steel retractable systems. As a result, the controlled wind velocity tends to decrease as the retractable roof area increases. On the other hand, the controlled wind velocity tends to increase as the retraction time increases. In addition, in the space-grid roof structures, the spherical roof structures type showed the average controlled wind velocity of 10m/sec lower than that of 17.3m/sec for curved-roof structure type, and in the curved-roof structure type, the truss roof structure showed the average controlled wind velocity of 8.9m/sec which is lower than that of 17.3m/sec for the space for the space-grid roof structure.

• 대한한의학원전학회지
• /
• 제36권2호
• /
• pp.61-75
• /
• 2023

Objectives : This study aims to examine the multi-layered meanings of Li Dongyuan's concept of 'internal damage' through examining the origins of the 'internal damage' concept together with discussions derived from his 'Differentiation of Internal and External Damage'. Methods : Rather than Li's original works, those done by later doctors who were influenced by Li were thoroughly examined in this study to determine the relationships among internal and external damage, and external contraction. Results : Based on discussions related to the 'differentiation of internal and external damage' following Li, his concept of 'internal damage' could be understood as multi-layered, as it contains both spatial as well as pathogenic meaning. Therefore the meaning behind categorizations of internal and external damage, and internal damage and external contraction could be different. Li's 'internal damage' concept includes not only internal pathogen but elements of external contraction of wind and cold, which seems to have been integrated into the 'Cold Damage Theory' after Zhu Danxi, seemingly having changed the concept of cold damage. Therefore, discussions on the crossing between internal damage and external contraction have on one hand expanded the boundaries of each concept, while on the other hand, have caused confusion between the two at times. Conclusions : The concept of 'internal damage' has been widely accepted due to Li Dongyuan, on which related discussions have been centered. However, the concept was originally multi-layered, naturally leading to various discussions. Future studies should focus on the relationship of 'internal damage' with 'external damage' or 'external contraction', beyond the theories of Li.

• 한방안이비인후피부과학회지
• /
• 제12권1호
• /
• pp.313-337
• /
• 1999

In oriental medicine, 'chi(痔)' is 'the prolapsed nodule' in 'Ku-gyu(九竅)', but in this paper, I will write about prolapsed nodule only in anus or around it, chi-jil(痔疾), it called hemorrhoid in western medicine. So in the literatual studies on chi(痔) in anus or around it, the results are as follows. 1. The etiology and pathogenesis of ch.i-jil(痔疾) is wind, wetness, dryness, and heat caused by inrregular diet habit, severe drinking and sexual action, deficiency of ki(氣) and hyeol(血). 2. Characteristic symptoms of chi-jil(痔疾) is the prolapsed nodule in the anus or around it, and general symptoms are hematochezia, pain, hernia, swelling, abcess, and mucosal secretion. 3. Chi-jil(痔疾) is classified eight types by characteristic symptom, shape, etiology and pathogenesis. They are mac-chi(脈痔), jang-chi(腸痔), ki-chi(氣痔), hyeol-chi(血痔), joo-chi(酒痔), mo-chi(牡痔), bin-chi(牡痔), and loo-chi(屢痔)(or young-chi(영痔), choong-chi(蟲痔)). Additionally, they are divided into two parts, internal and external chi-jil(痔疾), as likely as classification of internal and external hemorrhoid in western medicine. 4. Treatment of chi-jil(痔疾) is two methods, internal treatment and external treatment. Internal treatment is per os herb-pharmacotheraphy, external treatment is surgical or the other external pharmacotheraphy. There are several external treatment, these are fumigation-theraphy(熏痔法). irrigation-theraphy(洗痔法), paint-theraphy(塗痔法). withering-theraphy(枯痔法), bending-therphy(結紮法) and incisal -theraphy(切開法).

• 동의신경정신과학회지
• /
• 제16권2호
• /
• pp.53-64
• /
• 2005

Objects : This study was aimed to investigate the treatment on Mental disorder of Women. Methods : Research data is based on Buindaejoenyangbang and Dong-uibogam. And study the treatment in Mental disorder of Women. Results : 1. Owing to women's physiological extraordinary nature, Mental disorder of Women’s treatment does not match Dongyipogam’s about the same symptoms. 2. Most of happing the symptom is due to blood Wind(four flavors) and deficiency of the Heart, treatments are dispelling Wind, tonifying blood of the Heart and calming the spirit. 3. At postpartum, Mental disorder of Women’s causes are deteriorating blood vanquished blood and external affections with a blood deficiency from the loss of blood, treatments are tonifying the blood, expel Wind and clear Cold and remove blood stagnation to promote regeneration. Conclusion : The results suggest that the extraordinary nature of the circumstances due to women specific pathology must be considered.

• 해양환경안전학회지
• /
• 제6권1호
• /
• pp.35-45
• /
• 2000

The slipway, which is one of stern construction, is necessary for stern trawler to let fishing implements, such as fishing net, otter board and warp, go out effectively. It may be doubtable whether there is any possibility for deckwetness to occur because the slipway is obliquely in contact with sea surface. The author discusses any possibility for deckwetness through slipway of stern trawler in wind and waves. A 350 G/T class, ocean-going stern trawler is adopted for the present study. The stem trawler is particularly assumed to drift with fishing implements hung down the slipway due to internal or external accident during fishing operation in real sea. The author considers two factors as possibility for deckwetness to occur through slipway. One is mooring effect of fishing implements hung down the slipway under wind pressure, and the other is relative ship motion in vertical direction in waves. Through the numerical calculation, the author clarifies that there is thin possibility for deckwetness to occur from above two points of view.

• 한국정밀공학회지
• /
• 제30권9호
• /
• pp.977-982
• /
• 2013

Blades of wind energy plants are exposed to external shocks or internal cracks during operation. Furthermore, the blade surfaces can be contaminated by substances such as dust, blood of birds, salt or insects which can decrease the electricity generation efficiency significantly. For this reason, many blade cleaning companies started to appear and a variety of methods for cleaning were suggested. Despite these diverse methods, there has been no study to investigate how effectively to clean the substances in quantitative manner. In this paper, the cleaning efficiency of two rotor blade cleaning methods, brush and water-jet, is examined through experiments by changing operating parameters. Then, the optimal operating conditions for both methods are derived.

• Ocean Systems Engineering
• /
• 제1권1호
• /
• pp.1-15
• /
• 2011

Offshore structures are subjected to wind loads, wind generated wave excitations, and current forces. In this paper we focus on the wind generated wave excitations as the main source for the external forces on the structure. The main objective of the paper is to provide a tool for using deck acceleration measurements to predict the value of the force and moment acting on the offshore structure foundation. A change in these values can be used as an indicator of the health of the foundation. Two methods of analysis are used to determine the relationship between the force and moment acting on the foundation and deck acceleration. The first approach uses neural networks while the other uses a Fokker-Planck formulation. The Fokker-Plank approach was used to relate the variance of the excitation to the variance of the deck acceleration. The total virtual mass of the equivalent SDOF of the structure was also determined at different deck masses.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
• /
• pp.95-100
• /
• 2006

A ship collision avoidance system is developed to control the avoidance action of ship actually and properly in wind forces. The 4-DOF maneuvering equations of motion ar derived to catty out the simulation of the motion of a ship, and the wind forces are considered as the external forces in the simulation. This study suggests a new avoidance system that could include the ship's maneuvering characteristics.

• 한국항해항만학회지
• /
• 제32권4호
• /
• pp.271-277
• /
• 2008

When performing steering by an autopilot (automatic steering gear), a sensitivity adjustment is mainly determined by P value and D value. These values differ in the optimal combination by model of ship and external forces. This research was carried out simulation case studies and examined movement of Pure Car Carrier, which easily received ship by wind pressure influence in low speed We investigated the relation of horizontal migration(transfer) of ship's body and P-D value. Based on it, four parameters of P-D at approaching berth could be suggested Hence there were suggestions of parameters; Distance to maximum lee point, Time to maximum lee point, Time to return to original course and Time to 300th second. The correlation of these parameters and P-D value were also considered. As a result, we think that this index, like formulated P-D, leads to an easy and safe navigation by utilizing these indices.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2001년도 추계학술대회논문집 II
• /
• pp.1032-1039
• /
• 2001

In this paper, modal analysis of wind-power generator rotor system was performed by using finite element method. Experimental modal analysis of generator rotor system was performed and the result were compared with analytical ones. Sensitivity method and localized modification method were used to update finite element model. As a result of updating finite element model, errors of natural freguency were reduced within 0.5％ and MAC value was improved near by l. Stability characteristics of wind-power generator rotor-bearing system through harmonic analysis about several external force will be analyzed using finite element model.