IP 노트 - IP프로그램 융합 전공과목의 운용

양협,Yang, Hyeop 한국발명진흥회 2011 發明特許 Vol.36 No.6

통합윤활관리를 통한 설비의 보전성 향상

정구철,양협 三陟大學校 2000 論文集 Vol.33 No.1

Total Lubrication Management(TLM) can be defined as a new strategical engineering concept involved in planning, organizing, and implementing all the activities needed to slect a suitable lubricant and rationalize to acquisite the lubricant, and to unify all chemicals and enlosures used, and to standardize pertained procedures, and to establish the way and amount of lubrication, and to find-out and improve leakage points, and to implement an oil analysis and in turn recipes and feed-back, and to increase performance through the hydraulic and pneumatic retrofit, and computer-process the oil management principles, to yeild maximum profits in manufacturing industry. Under the recent IMF-stricken circumstances, all the manufacturer might be needed to reflect and consider every possible maintenance concepts such as a breakdown maintenance philosophy ("fix when broken"), a preventive maintenance philosophy ("If it ain't broke, don't fix it"), a predictive maintenance activity (a pre-alert to failure) and a proactive maintenance strategy (defined as an event which occurs prior to a critical change), and then construct a most suitable and profitable-oriented maintenance approaches according to their own production and maintenance policy. In this study, the feasibility of TLM is suggested and proposed, referring to the related data cited from an anonymous well-known Braun-tube manufacturing company in Korea.

기계계열 공학도를 위한 효율적인 단위 환산 기법(EUCT)에 관한 연구

승삼선,양협 三陟大學校 2000 論文集 Vol.33 No.1

In this study, Efficient Unit conversion Technique(EUCT) is studied and proposed for mechanical engineer's education. This metod is based on standard units and standard unit system. Where standard units mean 'mass(㎏)', and 'time(s)' 'temperature(K or ℃). And standard unit system means 'Le Systeme International d'Unites', that is called 'SI'. The contents of EUCT consist of understanding dimensions and units, fundamental units and derived units, SI and ability to combine units using fundamental units from definitions of each physical quantities or equations. For technique, it is introduced to take reduction of fraction after making form of fractional expression with magnitudes and units of physical quantity. And the questionnaring was conducted on 35 students for verifying utility of EUCT after teaching. Its results show usefulness in unit conversion technique. Therefore, EUCT is proposed by authors is very useful teaching method in unit conversion technique.

자동차압연강의 X선 잔류응력 특성에 관한 연구

양협,조석수,이성룡 三陟大學校 2000 論文集 Vol.33 No.1

In textured material, diffraction angle 2 θusually shows a nonlinear relation against sin²ψdue to the elastic anisotropy to crystals. SPCD and SOCD steel is cold rolled carbon steel for automobile. The characteristic X-ray for stress measurement is Cr-Kα and Mo-Kα characteristics X-ray. The 2 θsin²ψdiagram under elastic strain seems to have a linear behavior but has nonlinear behavior in distribution o data Cr-Kα characteristics X-ray. As the plastic strain of specimen increases, the nonlinearity of 2 θwith respect to sin²ψincrease remarkably. On the other hand the diffraction angle 2 θby Mo-Kα characteristic X-ray shows a good linearity on 2 θ-sin²ψdiagram plastic strain as well as elastic strain. This results from deep penetration depth and multiplicity factor of crystal diffraction plane in Mo-Kα characteristic X-ray.

연속주조 턴디쉬 내 유동제어부재의 배열 변경에 따른 용강유동 거동의 수모델 실험

양협 ( Hyup Yang ) 대한설비관리학회 2009 대한설비관리학회지 Vol.14 No.2

The tundish is necessary to separate impurities (slag) from the molten steel and to keep the steel to be cast pure in continuous casting (CC) process. The tundish also serves as a storage vessel for the molten steel during a ladle change in order not interrupt the casting process. Therefore, understanding of the arrangement of the flow control devices (i.e. baffles, dams, weirs and so on) and thus its effect to the flow pattern of the molten steel within the tundish is basic and essential parts of accomplishing the highest cleanliness of the steel. In this study, a 1/3 reduced tundish water model with four arrangements of flow control devices within the tundish was used to simulate and compare the characteristics of corresponding molten steel flow behaviors in prototype.

역전파 신경회로망을 이용한 복수 결함 패턴 인식에 관한 연구

양협,조석수,이성룡 三陟大學校 2000 論文集 Vol.33 No.1

Ultrasonic inspection of defects has been focused on the existence of defect in structural material and need has much time and expenses in inspecting all the coordinates (x, y) on material surface. Neural networks is information processing system modeling human brain and can have an application to coordinates (x, y) of defects by multi-point inspection method. Ultrasonic inspection modeling is optimized by neural networks which makes defect echo, back-well echo and ultrasonic transducer units of input layer and absolute and relative coordinates of defects and defect pattern units of output layer. This method can predict coordinates (x, y) of defects within engineering estimated mean error ψ.

CGAM 열병합발전 시스템의 비용구조

양협(Hyup Yang),변기택(Gi-Taek Byun),권용호(Yong-Ho Kwon),곽호영(Ho-Young Kwak) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5

The cost structure of the CGAM system, a predefined cogeneration system suggested to unify the different<br/> methodologies of thermoeconomic analysis, was investigated by using a thermoeconomic method called<br/> MOPSA(Modified Productive Structure Analysis). An emphasis has been specially put on how the cost<br/> structure of the system is affected by the chosen level of aggregation that specifies the subsystems. It has<br/> been found that the unit cost of products is dependent on the chosen level of aggregation of the system only<br/> when one consider the negentropy flow as one of the parameters to determine the unit cost of products.

압축비 조절기구가 부착된 단기통 디젤엔진에 대한 BDF의 적용

박형도,양협 한국특허학회 2009 특허학연구 : 한국특허학회지 Vol.11 No.1

본 연구에서는 가변 압축비 조절기구가 부착된 단기통 4행정 수냉식 디젤 엔진(모델 : Farryman A 30 marine, TQ, UK) 에 바이오디젤 연료(BDF)를 적용하여 엔진의 성능변수와 배기가스 특성을 살펴보았으며 여러 가지 연료와 운전조건에 따른 비연료 소비율(SFC)과 매연 농도도 함께 조사하였다. 사용된 연료는 상업용 디젤유(DF)와 BDF100(BDF 100 %), 그리고 이들의 혼합유인 BDF20(BDF vol. 20 % + DF vol. 80%) 이며, 이 중에서 DF를 비교 기준 연료로 하였다. 실험조건으로는 압축비(CR)가 12:1, 14:1, 16:1 및 18:1 이며, 엔진 속도가 1000, 1500, 2000 및 2500 rpm 이다. 실험 결과, BDF의 SFC는 엔진 속도에 따라 DF에 비하여 1.3 ~ 3.7 % 증가하여 나타났으며, 매연 농도는 DF에 비하여 최대 45.7 % 감소하여 나타난 반면에, NOx 는 최대 38 % 까지 크게 나타났는데 이는 선행 연구결과인 12.0 % 정도를 훨씬 상회한다. 또한, 엔진 출력은 사용한 연료 종류에 따라 큰 차이를 보이지 않는 것으로 나타났다. An experimental study on engine performance parameters and emission gas characteristics for bio-diesel fuels (BDF's) was performed by using of a specific engine; the type of single-cylinder, four-stroke, water-cooled diesel engine with variable compression ratio adjustment mechanism (the model Farryman A 30 marine, TQ, UK). Specific fuel consumptions (SFC) and soot tendency(smoke %) for various fuel and/or operation conditions were also examined. The BDF's used were prepared BD 20 and BD 100 together with the commercial diesel fuel (DF) for reference. The established conditions for experiment were 12:1, 14:1, 16:1 and 18:1 for compression ratio (CR), and 1000, 1500, 2000 and 2500 rpm for engine speed. It was found that SFC of BDF's is increased 1.3 ~ 3.7 % compared with DF according to the rpm's; for the smoke %, BDF's value is reduced significantly up to max. 45.7 % in comparison to that of DF; and while NOx is increased amazingly up to max. 38 %, which is too much than the previous results of around 12.0 %. Also, it does not seem that the engine's power output remains changed significantly according to the fuels used.

Homogeneous nucleation of nano size H₂O bubbles and their growth to micro size in rhyolite melts

곽호영,양협 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.3

Volcanism accompanies transfer of volatiles such as H2O and CO2 from the Earth interior to the atmosphere. The underlying process for transfer of the volatiles is magma degassing. As magma rises toward the Earth surface, the volatiles in silicate melts become supersaturated due to decompression of magma so that nucleation of volatile-bearing bubbles and subsequent growth of the bubble occur. In this study, bubble nucleation rate of water in rhyolite melts above 1000 K, which determines the style of the eruption of the magma, is calculated by using molecular cluster model. Calculation results indicate that the homogeneous nucleation of water in the rhyolite melts is possible when the supersaturation pressure exceeds 110 MPa and the number density of bubbles formed increases as increase in the degree of the supesaturation. Growth of bubble formed from the critical cluster was also calculated and the results were compared with observed bubble sizes. When the bubble number density is greater than 1015/m3, depletion of the concentration of volatiles hinders further growth of bubbles.

열원 형태에 의한 전자재료의 접합성에 관한 연구 I

신영의,양협,김경섭,Shin, Young-Eui,Yang, Hyub,Kim, Kyung-Sub 대한용접접합학회 1994 대한용접·접합학회지 Vol.12 No.4

This paper has been researched bondability of electronics devices, such as lead frame and the thick film of Ag/Pd on an alumina substrate by different heat sources. To obtain the bonds with high quality, it is very important to consist of different materials. Therefore, this paper clarifies not only heat mechanism of micro parallel gap resistance bonding method and pulse heat tip bonding method but also investigates selection of heat sources with micro-electronic materials for bonding. Finally, it is realized fluxless bonding process with filler metal such as plating layers.