• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.7
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• pp.1-16
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• 1994

In this paper, we propose a new multiple access scheme for VSAT(Very Small Aperture Terminal) data communications. The proposed scheme has better performance in terms of delay throughput than Controlled Multiaccess Scheme which has excellent performance. The proposed scheme use the spare reservation method, adaptation method to offered load, and fixed bandwidth reservation method. In this paper, we analyze the performance using simple queueing model and present the simulation results. When network traffic is very low, the new scheme and the controlled multiaccess scheme have almost the same access delay characteristic. As the network load becomes higher, the new scheme's access delay gain becomes larger. Futhermore, even when the network traffic is very high it is possible to access satellite link within the delay similar to one round-trip delay. In addition to access delay performance enhancement, the new scheme has facility that supports fixed bandwidth reservation. So it shows more enhanced performance in the environment that stream traffic is dominant such as in VSAT communication environment.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.820-825
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• 2004

The floating ring seal is used in an oxidizer and a fuel pump of the turbo pump unit in the liquid rocket engine to optimize a leakage without rubbing phenomenon. The damper floating ring seal, one of the floating ring seals, is with round hole pattern surfaces. It can reduce the leakage by increased friction factor that obtained from experimental data. In this paper, the leakage test about floating ring seal and damper floating ring seal was conducted. The test result showed the leakage performance of damper floating ring seal was better than the leakage performance of floating ring seal. With the leakage test the lock-up and rotation test about seal was conducted and that position is measured. The relatively large lock-up eccentric ratio was obtained from the test result of damping floating ring seal. The attitude angle of seal increases with increasing of shaft rotation

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.03a
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• pp.136-139
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• 1997

Applications of commercial software DEFORM-3DTM for 3-D simulation in extrusion process are developed for the analysis of twisting of extruded products. Because the elliptical shape has at least one line symmetry, the twisting is not occured during the extrusion. But, the results of extrusion simulation of the elliptical shape show that the twisted boundary of the die surface makes the material inside die surface rotate with the constant angular velocity. Otherwise, the simulation results of the S shaped product show that the twisting can be occured by the only 180$^{\circ}$rotation symmetry of S shape without no line symmetry and show that the angular velocity increases by the only 180$^{\circ}$rotation symmetry without no twisted die surface between on the die entrance section and on the die exit section. The results of the analysis show that the angular velocity of the extruded product changes with die length and friction condition.

• Journal of Chest Surgery
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• v.6 no.1
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• pp.51-56
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• 1973

This is one case report of successful resection of the aneurysm of the thoracic aorta, which det-ected by thoractomy unexpectedly, in the Department of Thoracic Surgery, Hanyang University Hospital. The patient was a 34 years old woman and subjective complaints was not related with the aneurysm. Chest film showed a small round hazy shadow in the left margin of the upper posterior mediastinum. A saccular aneurysm located on the descending thoracic aorta, 7cm distal to the left subclavian artery and arouse from the antero-lateral wall of the aorta. Excision of the saccular aneurysm was performed by cross clamping the descending aorta above and below the aneurysm, and then the defect of the aortic wall was closed by aortorrhaphy with continuous suture. Crossclamping time was required 15 minute. Histopathologically, the wall of the aneurysm consisted of all layers of the arterial wall, that is, intima, media and adventitia. Postoperative course was uneventful and aortogram showed good continuity of the blood flow of the entire aorta.

• Journal of Chest Surgery
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• v.7 no.1
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• pp.117-122
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• 1974

The benign tumor of smooth muscle, the leiomyoma, may arise anywhere in the body, in such tissues as the muscularis of the gut and the media of blood vessels, although by far its most common location is the uterus. Indeed, the mediastinal leiomyomas are extremely rare, especially when one excludes those arising in the esophagus. No dogmatic statements can be made with regard to age, sex distribution, symptoms, or clinical course because of the extreme paucity of cases available for evaluation. Although the majority of the reported cases are in the posterior mediastinum, thus suggesting esophageal origin. We have experienced a right inferior mediastinal leiomyoma in 36 years old housewife. She complained hemoptysis and right lower chest pain associated with intermittent low-graded fever and chillness. Routine X-ray film revealed a large irregular cystic mass density in the right lower thoracic cavity. On exploratory thoracotomy, a huge round yellow-gray colored solid mass, measured about 2.5kg in weight, was located in the right inferior mediastinum just above right hemidiaphragm, medially. The tumor mass was removed, being proved to be leiomyoma on histopathologic examination. Her postoperative course was uneventful and discharged without complication.

• Journal of the Korean Society of Safety
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• v.21 no.5 s.77
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• pp.92-102
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• 2006

The Honorary Industrial Safety Inspector System, which is with the object of establishment of an autonomic and collaborative industrial accident prevent system, comes into force on 1995 through the administration provision of the Ministry of Labor, one year after it had legal basis. The purpose of this study is to put forward revitalization of the Honorary Industrial Safety Inspector System by using the survey(2005.05) of the Honorary Industrial Safety Inspector in the manufacturing industry. It can be summarized to develop the system as the following: 1) Obligation to the appointment of the Honorary Industrial Safety Inspector and the Extension to be appointed workplace, 2) Cooperation of the Safety/Health Manager with the Honorary Industrial Safety Inspector, 3) Grant the Honorary Industrial Safety Inspector to make the round of the workplaces for the providing guidance to workers, 4) Employers' fulfillment of the Honorary Industrial Safety Inspector's recommendations, 5) Guarantee the Honorary Industrial Safety Inspector instructions and its hours.

• Journal of the Korean Society of Costume
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• v.53 no.3
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• pp.73-87
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• 2003

The custom and shroud for funeral rites of the early 17th Century based on the excavated costume from the grave of Mrs. Jung (1565 - 1614) are studied in this paper. The grave was located in the Pohang, Kyungbuk Province and was excavated in, April 1999. The remains consist of one set of epitaphs, 33 pieces of costume, 7 pieces of cloths, and 14 pieces of funeral accessaries. From these remains, this study newly reveals : 1) a specific funeral custom for the upper class from the fact that her husband, Ja-Hun Ki, was in the position of Prime Minister for the Chosun government when she died, 2) a fact that women also wore a formal dress with round-shaped collar (Dalryoung) and a concubine could use rectangular tablets ((Hyungbae) with peacock pattern according to her husband's rank, 3) a whole set of shroud used for women in the early 17th Century, and 4) specific construction methods for individual shroud.

• Asia pacific journal of information systems
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• v.2 no.2
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• pp.55-69
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• 1992

There have been several studies on the key issues in information systems (IS) management. This study replicates the Society for Information Management (SIM) survey done in U.S.A. to investigate the key issues in IS management in Korea. This survey focused especially on the professions in financial institutions. A three-round Delphi method was employed to collect the opinions of participants and obtain a reasonable level of consensus about the key IS management issues of financial institutions in Korea. The number one issue identified was top management support, followed by recruitment and development of IS human resources. This article also compares the key IS management issues of financial institutions and those of manufacturing industries in Korea.

• Journal of Korea Multimedia Society
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• v.18 no.12
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• pp.1555-1561
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• 2015

This paper tries to converge computer and art by applying anamorphosis principle in drawing technique to mobile application. As comparing to current anamorphosis which shows one image at the round cup, we focus on the variability which shows several variable images at the mobile device according to the color board. The usage of the proposed algorithm is able to extended to various areas such as souvenir and public relation.

• Journal of Korean Medical classics
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• v.17 no.4
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• pp.37-56
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• 2004

In the Circular flow of Meridians(經脈), the circulation of Nutrient Gi(營氣) is that the essence Gi(精氣) of food starts from Middle Cho(中焦), via heart and lung into the ring-type round of 12 Meridians(十二經脈) in turn of hand Meridians(水經) and foot Meridians(足經), Yang Meridians(陽經) and Eum Meridians(陰經). The circulation of Defensive Gi(衛氣) is that if going out from Eum part(陰分) into Yang part(陽分), is rounding on the Yang Meridians, if going out from Yang part into Eum part, is rounding on the five Jang(五臟) in order of Kidney(腎)-Heart(心)-Lung(肺)-Liver(肝)-Spleen(脾). Because the process of accumulating the essence Gi has a property of One-way flow, it flows from terminal to the direction of body trunk, has no distinct channel with its immaterial nature. and is concentrated on the lower part to that the five Jang belong.