점용접부가 폐단면 박판 부재의 강성에 미치는 영향

박용국,김진곤,Park Yong Kuk,Kim Jin Gon 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.2

For engineers in the industry, this study considers a reliable and practical finite element modeling technique to estimate the behavior of closed thin-walled members with spot weldings. Dynamic and static experiments confirm that the technique - modeling the spot weldings with solid elements which have the adjusted rotational freedoms and fill the welding space - Yields satisfactory results. Numerical studies on the double hat-shaped members. adopting this modeling technique. show the effect of the spot welding Pitch and the spot welding location in the flange on the stiffness of the members Using the principal stiffness and newly proposed GSPI(global stiffness performance index), we also carefully examine how the spot welding curvature, and sectional shape, etc.. synthetically influence the stiffness of a real excavator pillar in the field.

산야유 $\beta-Casein$의 효소 가수분해 특성과 가수분해물의 Angiotensin Converting Enzyme 저해 효과

박용국,권일경,김거유,Park Yong-Kuk,Kwon Il-Kyoung,Kim Gur-Yoo 한국축산식품학회 2005 한국축산식품학회지 Vol.25 No.2

산양유 $\beta-casein$의 효소에 의한 가수분해 특성과 가수분해물의 ACE 저해 효과를 측정하고자 산양유의 $\beta-casein$을 양이온 교환 컬럼인 Mono S HR 5/5를 이용하여 분리하였으며 분리된 $\beta-casein$을 동물성 분해효소인 trypsin으로 처리하여 가수분해 특성을 확인하였고 가수분해물의 ACE 저해활성을 측정하였다. Mono S HR 5/5 양이온 교환 컬럼을 이용한 산양유 산 케이신으로 부터 순수한 $\beta-casein$의 분리는 SDS-PAGE를 이용하여 확인한 결과 순수한 $\beta-casein$의 분리가 이루어졌음을 확인할 수 있었다. $\beta-casein$을 $37^{\circ}C4$에서 trypsin으로 처리하여 전기영동으로 확인한 결과 가수분해 직후부터 $\beta-casein$ 위치의 band가 희미해지기 시작하고 저분자량의 band가 나타나기 시작하였으나 120분이 지난 후에는 모든 band가 가수분해되어 사라졌고 산양유에서 분리된 $\beta-casein$을 trypsin으로 처리하여 120분 경과 후 그 가수분해물을 이용하여 ACE 저해효과를 측정한 결과 가수분해하지 않은 $\beta-casein$은 $1.80\pm1.21\%$의 ACE 저해활성을 보였으나 trypsin으로 가수분해하여 ACE 저해 활성을 측정하였을 때 $25.36\pm0.79\%$의 저해 활성을 나타내었으며, trypsin에 의한 $\beta-casein$가수분해물의 $IC_{50}$을 측정한 결과 $308.7\pm2.77({\mu}g/mL)$로 나타났다. This study was carried out to understand hyrolytic characteristics of $\beta-casein$ by enzyme in goat milk and to measure the inhibition effect of the ACE of the hydrolysate. In order to conduct the experiment, $\beta-casein$ of goat milk was separated using Mono S HR 5/5, a cation exchange column. The separated $\beta-casein$ was treated with trypsin of animal hydrolysis enzymes, in an effort to verify the characteristics of hydrolysis. The inhibition activity of ACE was measured and the results are as follows. By analyzing the hydrolysate separated from the trypsin-processed $\beta-casein$ of goat milk, the inhibition effect of the ACE was measured trypsin-hydrolyzed $\beta-casein$ demonstrated a $25.36\pm0.79\%$ of inhibition effect and the $IC_{50}$ of the hydrolysate from the trypsin-processed $\beta-casein$ reached $308.7\pm2.77({\mu}g/mL)$.

Tetrodotoxin 중독가토(中毒家兎)의 심전도학적(心電圖學的) 연구(硏究)

박용국,신홍기,김기순,Park, Yong-Kuk,Shin, Hong-Kee,Kim, Kee-Soon 대한생리학회 1976 대한생리학회지 Vol.10 No.1

Tetrodotoxin (TTX) is the purified active principle responsible for tetrodon (Puffer-fish) poisoning which has long been known in the Orient. The pharmacological actions of TTX have been rather extensively investigated. Two of the most prominent effects of intravenousely administered TTX are severe hypotension and respiratory paralysis resulting from its depressant actions on tissues. This depressant actions of TTX in turn result from the selective inhibition of sodium-carrying mechanism which is essential to generation of the action potential. TTX differs from local anesthetics in that it does not affect potassium conductance. Although the mechanism of the hypotensive action of TTX remains a subject of controversy, most investigator agree that TTX-induced hypotension is caused by alteration in the blood vessels rather than the heart. Not only the study on the effects of TTX on cardiac function is meager but the results of reported works are often contradictory. The present study was undertaken to investigate the effect of TTX on the electrocardiogram of the rabbit and to compare them with well known electrocardiographical characteristics found in digitalis and quinidine intoxicated animals. The results obtained from the present study are summarized as follows. 1. No changes were found in P-R interval and QRS duration after i.v. administration of $1.0\;{\mu}g/kg\;to\;1.5\;{\mu}g/kg$ TTX to the animals. It is obvious that there were no conduction disturbance between atria and ventricles as well as in the ventricular tissue. 2. In $1.0\;{\mu}g/kg$ TTX group, S-T interval and T-P segment were not changed whereas marked changes were observed in $1.5\;{\mu}g/kg$ TTX group. 3. The first and second degree A-V blocks appeared in the $2.0\;{\mu}g/kg$ TTX group. 4. TTX differs from digitalis and quinidine in that it does not cause S-T interval depression and T-wave inversion. In contrast with digitalis, TTX caused Q-T interval prolongation.

감성 평가를 이용한 듣기 좋은 음성 합성음에 대한 연구

박용국,김재국,전용웅,조암,Park, Yong-Kuk,Kim, Jae-Kuk,Jeon, Yong-Woong,Cho, Am 대한인간공학회 2002 大韓人間工學會誌 Vol.21 No.1

As the method of providing information is getting multimedia, the synthetic voice is used in not only CTI(Computer Telephony Integration), information service for the blind, but also applications on internet. But properties of synthetic voice, such as speech rate, pitch, timbre and so on, are not adjusted to customers' preference but providers' preference. In order to consider customers' preference, this study proposed four subjective factors of voice through the evaluation of voice using the method of sensibility ergonomics. And the relation synthetic voice to be agreeable to the ear with emotional images was formulated as a fuzzy model. Consequently, this study proposed the speech rate and pitch of synthetic voice which is agreeable to the ear.

新羅 菁州 蓮池寺址 推定

朴勇國(Park, Yong-Guk) 신라사학회 2008 新羅史學報 Vol.0 No.14

불량품과 스크랩을 고려한 고압 주조 공정 스케줄링의 효율 향상

박용국 ( Yong Kuk Park ),양정민 ( Jung Min Yang ) 한국경영공학회 2011 한국경영공학회지 Vol.16 No.2

Scheduling of high pressure casting processes by the linear programming (LP) models has layed a novel foundation on the research on production plans of casting. This paper presents a post-optimization scheme of the LP model to further enhance the efficiency of the scheduling result by reducing the prescribed number of expended ingots. Casting operations may yield defective castings due to malfunctioning of machines including shot profile error, problems associated with melting furnace control and non-metallic hard inclusions in molten alloy, etc. Also, casting processes generate scraps or unnecessary pieces of metal detached from solidified castings. Recycling defective castings and scraps in place of ingots certainly elevates the average ratio of the total weight of manufactured castings to the amount of provided alloy. In particular, a heuristic algorithm for the recycling procedure of defective castings and scraps is proposed, and its applicability and superiority are validated in a numerical experiment.

선형계획법을 이용한 고압주조공정의 비용 최소화

박용국 ( Yong Kuk Park ),양정민 ( Jung Min Yang ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.1

A scheduling of casting processes is to determine the number of cast products that will be manufactured in each casting shift in order to optimize a predetermined objective function. In this research, a linear programming (LP) model is proposed to minimize the dissipated cost of high pressure casting processes in real foundries. The considered casting operations make cast products in a sequence of recursively occurring shifts. The total dissipated cost of the casting operation is the sum of the average dissipated costs expended by melting furnaces and casting machines, respectively. Entire relevant constraints associated with the characteristics of high pressure casting are completely described in linear equalities and inequalities. To validate the applicability of the proposed model, numerical experiments are conducted with cost coefficients obtained from real foundry data. The experimental results demonstrate that the newly proposed model serves as a simple and highly effective tool for solving real casting sequences in terms of cost efficiency.

광역 열 네트워크망의 리턴수와 공급수 활용 및 분산 열원 융합 건물 냉난방 최적 운영 기법

박용국(Yong Kuk Park),이민구(Min Goo Lee),이태훈(Tae Hoon Lee),김태원(Tae Won Kim) 대한전자공학회 2021 전자공학회논문지 Vol.58 No.9

본 논문에서는 광역 열 네트워크망의 열 에너지와 다양한 분산 열원으로 구성되어 있는 마이크로 열 그리드에서 효과적인 건물 냉난방 운영 기법을 제안한다. 기존의 지역난방 열 공급은 대형 열병합 발전소를 통해 특정 지역을 대상으로 열 에너지를 공급하는 광역 열 공급 체계가 대부분을 차지하고 있다. 따라서 마이크로 열 그리드의 에너지 효율을 제고하기 위해 이러한 광역 열 네트워크망의 열 에너지를 분산자원과 융합하여 운영해야 한다. 본 논문에서는 마이크로 열 그리드에서 광역 열 네트워크망의 열에너지를 활용하고 이를 다양한 분산 열원과 융합하여 운영할 수 있는 건물 냉난방 운영 모델을 도출하였으며 시뮬레이션을 통해 제안된 기법의 냉난방 최적화 성능을 확인하였다. In this paper, we propose an effective building heating and cooling approach in micro thermal grid composed of variously distributed thermal resources coupled with heat energy of district heating network. Most of conventional district heating system have been supplying heating energy from a large-scale CHP. Therefore, for enhancing the energy efficiency of micro thermal grid, it should be possible to operate the micro thermal grid made up of diverse thermal resource coupled with district heating network. Consequently, the effective building heating and cooling model based on microgrid thermal resource integrated with district heating network energy was derived, and subsequent simulation validated it’s optimized performance.

Shift-By-Wire 시스템의 임베디드 제어로직 설계

박용국(Young-Kug Park),강의선(Eui-Sun Kang) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.11

본 논문은 BLDC모터가 장착된 Shift-By-Wire 시스템을 구동하기 위한 제어 프로그램을 설계하고 그 성능을 평가한 것으로써, 제어 알고리즘은 변속할 때 디텐트플레이트의 형상에 따라 보정변수로 설계된 목표속도를 추종하도록 모터 속도제어를 수행하고, 만약 목표 변속 단에 도달하게 되면 모터를 특정 위치에 정지시키는 정렬 방식을 도입하였다. 제어 프로그램은 10ms 태스크로 작동되는 시간기반 제어영역과 홀센서 신호를 기반으로 동작하는 이벤트기반 제어영역으로 이루어져 있다. 시간 기반 제어는 센서 및 통신 오류 진단, 현재 변속 상태, 목표 회전수 및 모터 회전 방향, 모터 속도제어로 구성되며, 반면에 이벤트 기반 제어는 six-step 결정 부분, 상 전환 시퀀스 제어, 상 전환 스위칭 제어 및 모터 속도 계산으로 구성된다. 설계된 제어 프로그램은 제어기에 탑재되어 제어기능에 대한 평가를 수행하였으며, 그 결과 변속 소요시간은 최대 300~400ms으로 차량 양산업체의 요구수준을 만족하였으며, 소비전류는 4~8A 수준으로 양호한 결과를 얻었을 뿐만 아니라 센서의 고장진단 프로그램도 정상적으로 작동됨을 확인하였다. We designed a control program for driving a shift-by-wire system with a BLDC motor. The control algorithm introduces an alignment method that performs motor speed control to follow a target speed. It was designed with calibration parameters according to the shape of the detent plate. Furthermore, an alignment method that stops the motor at a specific position is introduced. The control program was designed as a time-based control area operated with a 10ms task and an event-based control area operated based on hall sensor signals. The time-based controller consists of sensor and communication error diagnosis, the current shift state, the target speed and motors rotation direction, and the control of the motor speed. The event-based control consists of a six-step decision, commutation sequence control, commutation switching control, and a calculation of motor speed. The designed control program was embedded in a control board to evaluate the control function. As a result, the shift time was up to 300-400ms, which satisfies the requirements for vehicle mass production. The current consumption was 4-8A, and it was confirmed that the sensor failure diagnosis program was operated normally.

적시 생산 방식에서의 주조공정 스케줄링

박용국(Yong Kuk Park),양정민(Jung-Min Yang) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.3

In this article, scheduling of a casting sequence is studied in casting foundry which must deliver products according to the Just-in-time(JIT) production policy of a customer. When a foundry manufactures a variety of casts with an identical alloy simultaneously, it frequently faces the task of production scheduling. An optimal casting schedule should be emphasized in order to maximize the production rate and raw material efficiency under the constraints of limited resources; melting furnaces and operation time for a casting machine. To solve a real production problem in a typical casting plant proves that the proposed method provides a feasible solution with a high accuracy for a complex, multi-variable and multi-constraint optimization problem. Employing this simple methodology, a casting foundry having an automated casting machine can produce a mixed order of casts with a maximum furnace utilization within the due date, and provide them according to their customer's JIT inventory policy.