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윤병수(Byeong Su Yun) 대한공업교육학회 1979 대한공업교육학회지 Vol.4 No.1
Friction welding is actually applied to parts of a machine. Therefore, it is very essential to obtain the optimum welding condition for friction welding by use of metal turning lathe. This study deals with the experimental results of the friction welding, and mechanical properties to obtain the optimum welding condition for frition welding by use of metal turning lathe. The specimens are made of diameter Φ9.Om/m of mild steel, and diameter Φ12.Om/m of carbon steel. The experimental results were as follows: 1. Results of the tension test: 1) In case of carbon steel, both welded and normalized specimens after welding are broken at the point in the parent material rather than in the welded part. The joint have higher(about 20% much higher) mechanical properties than the parent material 2) In case of mild steel, welded specimens are broken at the point in the part of welding joint. Tensile strength effecency of the welded part was about 91%. 2. It was found that friction welding effeciency of the carbon steel is much higher than that of mild steel.
Al-Si 합금 분말 압출재의 마찰용접 특성에 관한 연구
윤병수(Byeong Soo Yun) 대한공업교육학회 2000 대한공업교육학회지 Vol.25 No.1
This paper was investigated on the friction welding characteristics of rapidly solidified Al-Si alloys. The tensile test, the hardness test, the observation of tensile fracture surface and microstructure tests were experimented for friction weldability. The result of experiment was obtained good weldability. The maximum tensile strength of welded joint was obtained 266㎫ as 93% of base metal. In this case, welding conditions are N=2.000r.p.m. P₁=40㎫., P₂=120㎫, t₁=5sec and t₂=5sec.
초고속 인터넷서비스를 위한 케이블 데이터 가입자 망관리 시스템 설계 및 구현
윤병수 ( Byeonh-soo Yun ),하은주 ( Eun-ju Ha ) 한국인터넷정보학회 2004 인터넷정보학회논문지 Vol.5 No.3
일반 가입자들에게 초고속 인터넷 서비스를 제공하기 위해서 구성되는 가입자 망은ADSL, VDSL, DOCSIS 등 다양한 종류의 접속방식과 그에 따른 이기종(異機種)의 장비들로 이루어져 있다. 이러한 가입자 망은 전국적으로 분산되어 있으며, 분산된 가입자 망을 효과적이며 집중화된 형태로 관리하기 위해서는 다양한 형태의 접속방식을 지원하는 이기종 장비 및 단말들의 상위 개념으로서 추상적이며 논리적인 객체 관리모델이 필요하다. 본 논문은 통합된 계층적 망관리를 가능하게 하는 인터넷 가입자 망에 대한 모델링 구조를 RM-ODP를 이용하여 제시하였다. 그리고 가입자 망의 예로서 UML을 이용한 객체지향 방법론을 채택하여 DOCSIS의 HFC 가입자망에 대한 관리 시스템을 설계하고 구현하였다. There are several types of distributed subscribers network using Asymmetric Digital Subscriber Line (ADSL), Very high-bit rate Digital Subscriber Line (VDSL), and Data Over Cable Service Interface Specifications (DOCSIS). The efficient and concentrated network management of those several distributed subscribers networks and resources require the general information model of network, which has abstract and conceptional managed objects independent of type of network and its equipment to manage the integrated subscriber network. This paper presents the general Internet subscribers network modeling framework using RM-ODP (Reference Model Open Distributed Processing) to manage that network in the form of integrated hierarchy. This paper adopts the object-oriented development methodology with UML (Unified Modeling Language) and designs and implements the HFC network of DOCSIS as an example of the subscriber network
세포독성과 형태학적 변화 관찰을 통한 5종 에센셜 오일의 안전성 검색
윤영한 ( Young Han Yun ),김경순 ( Kyong Soon Kim ),오혜영 ( Hye Young Oh ),유병수 ( Byong Soo Yu ),김기영 ( Ki Young Kim ) 한국미용학회 2008 한국미용학회지 Vol.14 No.3
In medical- and esthetic area the aromatherapy has spread widely by using of inhalation, bath and topical massage with essential oil. Thereby the safety, danger of irritation and sensitive reaction and injury of essential oil must be considered for clients and therapists. Therefore, in this study the safety of 5 species essential oils (ginger, cypress, rosemary, lavender and black pepper) was proven by the measurement of MTT-assay and sirius red staining. Liver cell, brain cell and kidney cell were chosen for the cell viability assay and morphological change observations. In this result, ginger and rosemary have shown as 50% of liver cell viability in concentration of 0.0012㎕/㎖ and 0.0014㎕/㎖. Cell lysis and nucleus breaking were shown in concentration of 0.002% cypress and lavender treated liver cell, and 0.001% black pepper and cypress treated brain cell. Ginger, rosemary and lavender were appeared as very low cytotoxicity on brain cell (in concentration of 0.0006 ㎕/㎖(ginger oil), 0.0011㎕/㎖(rosemary) and 0.00054 ㎕/㎖(lavender)). And lavender, rosemary and ginger revealed very low toxicity on kidney cell, and cell lysis and nucleus breaking did not observed in concentration of 0.002% lavender and rosemary treated kidney cell. Cypress has shown a low cytotoxicity on liver, brain and kidney cell. In conclusion, 5 essential oils such as ginger, cypress, rosemary, lavender and black pepper may be use carefully in very low dosage for inhalation and the concentrated essential oil should not be directly touched and exposed. Absolute essential oils must be diluted with carrier oil for topical and systematic massage.