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한국기계기술학회지 [Journal of the Korean Society of Mechanical Technology]

간행물 정보
  • 자료유형
    학술지
  • 발행기관
    한국기계기술학회 [Korean Society of Mechanical Technology]
  • ISSN
    1229-604X
  • EISSN
    2508-3805
  • 간기
    격월간
  • 수록기간
    1999~2019
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제15권 제6호 (37건)
No
1

생체의료용 Ti-Nb 합금 개발에 관한 연구

조사현, 전우용, 국진선, 원대희, 김병일

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.805-8111

※ 기관로그인 시 무료 이용이 가능합니다.

This study was purposed to develope a titanium alloy with low elastic modulus to be used as dental implant. The new titanium alloy was prepared as binary alloy by adding niobium (Nb) into the Ti-XNb system alloy. In designing the new titanium alloy, two physical variables bond order (Bo) and d- electron orbit energy level (Md) were varied. Mean bond order (  ) was around 2.8364~2.8742eV, and Mean d-electron orbit energy level ( ) was 2.4572~2.4757eV. The elastic modulus of the developed titanium alloy was 60.93~ 100.57GPa. In the results of X-ray diffraction analysis, ß-phase was observed in all the specimens, but α+β phase texture was also observed in Ti-7Nb and Ti-17Nb alloy. According to the results of potentiodynamic polarization experiment, Ti-7Nb alloy showed the highest corrosion potential as -209.0㎷. ß-phase and α-phase are observed from Ti-XNb alloys (X=7 and 17) however ß-phase is observed from Ti-XNb (X=27, 37, 47 and 57)alloys. TEM analysis identified additional feature for Ti-57Nb alloy was detected in addition to the ß-phase.

20,000원

〈학술연구〉

2

전기자동차용 배터리의 내부 유동장 및 온도장에 관한 수치 해석적 연구

서현규

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.813-818

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Numerical analysis of the electric vehicle battery was performed for the optimization of the thermal management under various operating conditions. For the analysis of internal flow and temperature distributions under the different operating conditions of battery, the battery system which was packed 18 battery cell with -25℃∼ 65℃ operating temperature range was considered, and the air flow rate, velocity, and ambient temperature conditions were varied and compared. It was revealed that the cooling system for battery was necessary to maintain its performance for hot ambient conditions. Especially, in this condition, at least 90m3/h of air flow rate are required to maintain the module temperature under 40℃. However, heating system of battery for cold ambient conditions doesn't need.

4,000원

3

극초음속 유동장 재돌입체에 대한 공력 계산

Michiko Ahn Furudate

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.819-825

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Aerodynamic coefficients of a reentry bodyin hypersonic flowfiled are calculated by using a three-dimensional flow solver. The high temperature real gas effects, thermal excitations and chemical reactions of air, are accounted for in the calculation. The reasonable agreement between the calculated aerodynamic coefficients and the Apollo AS-202 flight date are obtained. The effects of thermochemical nonequilibrium on the aerodynamic predictions are shown to be non-negligible.

4,000원

4

에폭시 본딩을 이용한 자기변형 박막 작동기의 거동

전찬열

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.827-831

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Magnetostrictive actuator is fabricated with epoxy bonding method instead of sputtering method in this study. Fabrication process and experimental measurement method for magneto- mechanical characteristics is proposed. For the design of highly flexible magnetostrictive actuator, TbDyFe epoxy bonding with SU-8 substrate is adopted. The fabrication process for SU-8 substrate and the epoxy bonding is suggested and magnetostrictive behavior is investigated. Variable magnetic field is applied to measure the various magnetostrictive characteristics and magnetostriction is measured with different waves and different magnitude of magnetic field.

4,000원

5

협착된 혈관에서의 혈류유동에 대한 수치해석적 연구

김동균

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.833-839

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In the present numerical study, simple stenotic artery models using pulsatile flow condition were investigated. A reversing sinusoidal velocity for pulsatile flow was imposed at the flow inlet and the corresponding based on the vessel radius. The stenotic geometries modeled using mechanical 3D CAD. It has been used that consist of 0.2, 0.4, 0.5 0.75 and 0.8 stenotic rate in a cylindrical tube. In this paper, numerical solutions are presented for a second harmonic oscillatory flow using commercial code CFX 14. As stenosis rate increases, the maximum wall shear stress(WSS) increases while the minimum WSS decreases. As the stenotic rate increases, the pressure drop at the throat severely decreases to collapse the artery and plaque. It is found that the fluid mechanical disturbances due to the constriction were highly sensitive with rate of stenosis. When stenosis rate increases, the recirculation region exists. In this recirculation region the possibility of plaque attachment is increasingly higher. The present results enhance our understanding of the hemodynamics of a stenotic artery.

4,000원

6

압축 착화 엔진에서 바이오디젤의 연료 혼합비가 분사율 특성에 미치는 영향

서현규

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.841-846

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Injection rate characteristics of biodesel fuels according to the blending ratio was described in this work. The injection rate measuring system based on the Bosch's method was utilized to measure and compare the fuel injection rate characteristics. Three different types of biodiesel which were derived from seed, unpolished-rice, and soybean were blended with the diesel fuel in 20% and 40% of volumetric ratio. The fuel properties, injection mass, and injection rate characteristics were obtained and compared in various injection conditions. It is expected that this observations provide important insights into the effect of fuel properties on the biodiesel fuel injection rate performance in a CI engine.

4,000원

7

차량 자동 변속기 부품용 PZT-Ni 박판 적층 마이크로 작동기의 유한요소 해석

이흥식

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.847-852

※ 기관로그인 시 무료 이용이 가능합니다.

Numerical analysis of the electric vehicle battery was performed for the optimization of the thermal management under various operating conditions. For the analysis of internal flow and temperature distributions under the different operating conditions of battery, the battery system which was packed 18 battery cell with -25℃∼ 65℃ operating temperature range was considered, and the air flow rate, velocity, and ambient temperature conditions were varied and compared. It was revealed that the cooling system for battery was necessary to maintain its performance for hot ambient conditions, especially, in this condition, at least 90m3/h of air flow rate are required to maintain the module temperature under 40℃. However, heating system of battery for cold ambient conditions doesn't need.

4,000원

8

3축 스테이지의 자동 용접 작업을 위한 웹카메라 영상 처리 기반의 자연 지표 추출법 개발

이세진, 이경민

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.853-860

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This study introduces the web-camera image processing-based natural landmark extraction method for automatic welding using 3-axis stage. The welding is a highly significant process in the industries of shipbuilding, automobile, construction, machinery, and so on. However, it has been avoided due to poor working conditions such as fume, spatter, noise, and so on. For the automatic welding system, the web-camera is used to extract the natural landmarks which can give the relative coordinate to set up the initial position of the stage for the welding process. The Canny edge and Hough transformation have been used to extract the significant points for the natural landmark extraction in this paper.

4,000원

9

나트륨 히트파이프의 작동 특성 및 성능에 관한 실험적 연구

강환국, 조운

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.861-867

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The experimental study for an operational characteristics and performance of the sodium heat pipe were carried out. For an experiment, the heat pipe which is 1000mm length and 25.4mm diameter of stainless steel container with 50 mesh of screen wick using sodium as a working fluid is manufactured and tested as functions of heat flow rate, inclined angle and operating temperature. The test results are as follows. During the start-up, frontal start up was observed because of the vapor density increasing as increased the hot zone. Also, the heat pipe showed uniform temperature over than 420℃ of the operating temperature. The average heat transfer coefficient increased as the heat flux and the vapor temperature increase, and the range of the total thermal resistance was 0.075~0.04℃/W at the 12~53.55kW/m2 of heat flux and 500 ~750℃ of operating temperature. The maximum heat flow rate was 750W at the 10 degree of top heating mode.

4,000원

<학술연구>

10

공정접합용접기를 이용한 이종재료에 대한 접합특성

이윤기, 선신규

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.869-874

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Recently, applied areas of nonferrous materials have been expanded in terms of efficiency of materials used and cost reduction. And, in accordance with compactness and accuracy of parts, the need of joining of dissimilar materials is raised. Accordingly, this study aimed at finding out the optimal welding current value(6.3~6.5kA) considering tensile strength, fracture test and welding residue after joining with various welding conditions by means of copper pipe(Φ7.0 × t0.5) and aluminium pipe(Φ7.0 × t0.7) using an eutectic diffusion bonding machine.

4,000원

〈학술연구〉

11

터보차져의 파손현상과 열응력 해석

최복록

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.875-880

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Thermo-mechanical fatigue cracks on the turbine housing of turbochargers are often observed in currently developed gasoline engines for them to adopt lightness and higher performance levels. Maximum gas temperatures of gasoline engines usually exceed 950℃ under engine test conditions. In order to predict thermo-mechanical failures by simulation method, it is essential to consider temperature- dependent inelastic materials and inhomogeneous temperature distributions undergoing thermal cyclic loads. This paper presented the analytical methods to calculate thermal stresses and plastic strain ranges for the prediction of fatigue failures on the basis of motoring test mode, which is commonly used for accelerated engine endurance test. The analysis results showed that the localized critical regions with large plastic strains coincided well with crack locations from a thermal shock test.

4,000원

12

쉬라우드 형상 별 조류발전 터빈 주위의 해수유동특성

김종원, 이상호

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.881-886

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Numerical simulation has been carried out to analyze seawater flow characteristics for tidal current power generation turbine with shroud geometry variation. Seawater flow field near the turbine is largely affected by the shroud geometry variation, and its design is critical for efficient tidal current power generation system. Fluid velocity around the turbine is high close to the tip of shrouded turbine blade. Seawater flow velocity around the turbine could be increased with the installation of shroud. Wake flow in the rear-side of shrouded turbine gradually decelerates with the diffuser angle of shroud, Orad ≤ Θ2 ≤ 0.201rad. The results from this study could be applicable for optimal design of tidal current power generation system.

4,000원

13

자동차 시트 리크라이너들의 강도 특성 비교에 관한 연구

손홍붕, 조재웅

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.887-892

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In this study, recliner is modelled and compared with 2 types of models as conventional recliner and round recliner by investigating stress and displacement through strength analysis. The maximum deformation of 0.018mm at round recliner is much smaller than that of 0.18mm at conventional recliner. It can be seen that the round recliner has more safety than conventional recliner. Round recliner model has more durability and safety than conventional model by the result of structural and vibration analysis. The model design of automotive recliner can be designed effectively at applying the safe driving of automobile practically by using the result of this study.

4,000원

14

덧살 영향을 고려한 이종마찰용접재의 응력특이성 해석

박철희, 김은영

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.893-899

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Friction welding in dissimilar materials is widely applied in various engineering fields such as automobiles, rolling stocks, machine tools. Since interface edges of Friction-welded materials have stress singularity by differences of mechanical properties and temperature changes, it is necessary to assess stress singularity with the variation of flash shape and length. In this paper, the influences which the flashes created by friction welding concern to the stress singularity at interface edges are investigated. Through stress analysis by the BEM and static experiments, the influences were studied quantitatively, the stress singularity greatly depends on the shape of the flash and its size.

4,000원

15

접착된 알루미늄 폼의 전단 피로 해석에 대한 연구

조호선, 조재웅

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.901-906

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Adhesive joint method has been used instead of welding, reveted joint, bolt and nut in various industry fields recently. Aluminum foam has hole or crack on adhesive interface which is different from common composite material. To investigate shear characteristic of adhesive interface between aluminum foams, double cantilever beams(DCB) with thicknesses of 25mm, 45mm and 65mm bonded with single-lab joints are designed. The relation between nodes at finite element model is important to investigate adhesive strength in this study. All meshes are generated and some nodes are located on adhesive zone along collinear axis. As reaction force obtained by static experiment is applied, fatigue analysis is carried with 10Hz. In advance, adhesive property is obtained by preliminary experiment for applying adhesive strength to input into simulation analysis. With these conditions, the analysis results show that 2.97MPa, 3.10MPa and 4.2MPa of maximum equivalent stresses are shown respectively in case model thicknesses are 25mm, 45mm and 65mm. By use of the simulation result at this study, it is possible to find adhesive behavior of aluminum foam and be applied to real adhesive joint structure without experiment by sparing experimental cost and time.

4,000원

16

원자력 발전소 어넌시에이터 패널의 내진에 대한 구조적 안전성 해석

이흥식

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.907-912

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This study presents a structural safety analysis method for a plant annunciator panel under the seismic effect. Seismic qualification analysis for the nuclear plant annunciator panel is carried out to confirm the structural integrity and the results are represented by required response spectra. For the numerical analysis, finite element method is adopted. Mode combinations are also used to obtain the reliability of the spectrum analysis. The analysis results shows that the nuclear plant annunciator panel is designed as a dynamically rigid assembly, without any resonance frequency blow 33Hz. The calculated stress of the nuclear plant annunciator panel is much less than yield stress of used steel.

4,000원

〈생산기술〉

17

두 개의 역방향 회전자 발전기를 갖는 초임계 이산화탄소 Brayton 주기 개념설계

유용환, 김준연, 우상익

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.913-918

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The supercritical carbon dioxide Brayton cycle(S-CO2) is one of promising alternatives as a power conversion system of the sodium-cooled fast reactor due to higher cycle efficiency and less reactive working fluid to sodium, compared to the steam Rankine cycle. In a S-CO2 Brayton cycle, turbine, compressors and generator are coupled with a same axis and their rotating speeds are variable in accordance with electrical outputs. However, to synchronize the cycle with a electrical grid, the electrical output of the cycle must has the same frequency with the electrical grid regardless of amount of the turbine output. To deal with this problem, several methods were proposed but each method still has their own weaknesses. In this paper, a new idea will be presented. The idea that the generator with the two reverse rotors are introduced into S-CO2 Brayton cycle and it aims to produce a full range of electricity at a fixed frequency with high efficiency.

4,000원

〈학술연구〉

18

액비제조용 이젝터 성능해석

안국찬, 김봉환, 강혁재, 서재규

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.919-924

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The bio reactors with high efficiency using ejector are widely used in gas-liquid system, This is also due to the high efficiency in gas dispersion resulting in high mass transfer rate and low power requirements. Thus, the new liquid fertilizer manufacturing equipment composed with aeration tank, cycling tank and circulation pump using an ejector was developed. The aim of this study is to investigate the effect of an ejector on the liquid fertilizer manufacturing equipment and to design the optimal ejector for actual application using CFD analysis and experimental method. The results show that the suction air mass flow rate is increased, as the diameter of driving ejector nozzle is smaller and the position of nozzle is toward the exit of an ejector.

4,000원

19

금속재료품 제조공정의 소음 발생 기구 - 중소기업을 중심으로 -

김병삼, 박진영, 이영욱

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.925-930

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The object of this paper is to examine the noise generating mechanism at manufacturing process of metal material products. To accomplish the object; A noise generating mechanism of high noise machine, which is mounted in the small and medium size enterprise, was investigated. The measurement method of the noise for the machine by manufacturers were investigated. The noise at the 250 points of the manufacturing process machine in the 40 processes of the 3 factories, 3 business fields was measured. The database of the noise was built from the measurement data. The major sound sources and frequency range for the manufacturing process of metal material product machine was investigated.

4,000원

20

진동저감형 의료용 Saw-Blade System의 개발

안영명, 이창훈

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.931-936

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Instruments for surgical and dental application based on oscillatory mechanics submit unwanted vibrations to the surgeon's and dentist's hands. frequently the weight of the instrument's body is increased to dampen its vibration. Because medical devices to contact with human body directly are sterilized before use, conventional damping method and damper are not good for medical use. For dissipation of vibration, based on recent research regarding the optimization of particle damping, we made a prototype particle damper that dissipate the vibration of oscillatory saw and tested for validation of particle damping. As a result we found that particle damper operate more efficiently than solid mass damper if the geometry of the damper is optimized with respect to the specific amplitude of the vibration.

4,000원

21

전산해석과 압축실험을 통한 세포지지체의 기계적 특성 평가

이세환, 안상현, 조영삼

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.937-941

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In this article, we reported the characterization of mechanical properties for several scaffolds fabricated by different techniques: bio-plotter technique and WNM(wire-network molding). Firstly, we constructed numerical models for ABAQUS: a commercial computational analyzing program. Using ABAQUS, effective compressive are calculated and compared with the experimental results from UTM tests. The results show that the stiffness of the scaffold fabricated by WNM is stronger than that by bio-plotter technique.

4,000원

22

승용차용 템포러리 스틸 휠의 구조적 특성에 관한 연구

안국찬, 김봉환, 강호덕, 정대식

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.943-948

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The wheel is an active area of automobile component design and development. The wheel must be durable enough to tolerate significant loads and harsh environment. Temporary tire substituted for spare tire is made in a half band wheel size. Therefore this temporary tire is carried out lightweight and fuel saving of automobile. In this research, structural analysis and fatigue analysis of the temporary steel wheel are carried out using ANSYS 3D-modeling. The model is verified by the equivalent(von-Mises) stress analysis obtained from the ANSYS static structural analysis. Fatigue analysis is performed at the equivalent stress considering the automobile load and moment. Finally, this temporary wheel can be used temporary but not continuously.

4,000원

〈생산기술〉

23

자동차의 엔진 배기열의 효과적인 에너지 하베스팅에 관한 연구

김명윤

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.949-953

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About 30 percents of the energy produced by a gasoline engine is used to move a car, and nearly 70 percent is lost through waste heat. A thermoelectric generator module can harvest some of this waste heat. Thermoelectric power generation voltage and current according to the temperature change at high temperature part of thermoelectric module is increased. The reason is that the Bi-Te based thermoelectric module which is to recover waste heat of exhaust gas is increased according to high temperature. The maximum power of 5.1 Watt at 230℃ was generated at energy harvesting system using exhaust gas from internal combustion engine. Thermal power module temperature difference between both ends of the high temperature and low temperature section increases the maximum output power increases. The key factor of Thermoelectric power generation performance is the temperature difference between the both ends.

4,000원

〈학술연구〉

24

태양열 에너지 저장탱크에서의 충진제 특성에 따른 열유동 해석

조재혁, 김우태

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.955-959

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A 2D axisymmetric numerical analysis was performed to study the characteristics of charge process inside solar thermal storage tank. The interfacial area density and inertial resistance of filler material are selected as simulation parameters. The interfacial area density is varied as 800, 2000, and 4000 1/m. The inertial resistance is varied as 1, 3, and 5 1/m. When the interfacial area density increases from 800 to 4000 1/m, the discrepancy of the temperature distributions between the filler and heat transfer fluid decreases. As inertial resistance increases from 1 to 5, both of the temperature and fluid flow pattern changes considerably.

4,000원

25

파이프 조관기용 연속 절단 커터 장치의 설계에 관한 연구

김기선

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.961-966

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This study is for a pipe cutting apparatus for use in a process of a pipe. The system refers to a novel structure comprised of a main bed, a feeder part and a cutter part. The feeder part is comprised of an AC servo motor unit, a feeding gear unit, a LM guide and a rail. The cutter part is comprised of a blade unit consisting of a blade for cutting, a AC servo motor to rotate the blade unit and a clamp unit to fix the pipe. This study proposes a mechanism of a product by designing the system and analyzes the cutting power. This study will be used as basic data for the design by analyzing the vibration and the structure.

4,000원

26

xEV용 배터리 모듈의 냉각유체 유입구 위치에 따른 냉각성능 분석

류의환, 김우태, 김선우

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.967-971

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A three dimensional numerical analysis was performed to study the cooling performance of xEV battery module depending on cooling fluid inlet position. Depending on the inlet position from the top, case 1 (top inlet), case 2 (middle inlet), and case 3 (bottom inlet) are selected. For the case 1, the temperature of the battery near inlet was higher than that of the battery near outlet. For the case 2 and 3 the temperature of the battery near inlet was lower than that of the battery near outlet. From the analysis result, the cooling performance is higher in the order of case 2, case 3, and case 1.

4,000원

27

기계시스템의 정적 평형상태 해석을 위한 수치해석 방안 연구

김광석

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.973-979

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In this study, the system Jacobian matrix is derived using symbolic method and developing general program to analyze quasi-static problem for mechanical system. The constraint equations in terms of generalized coordinates are generated symbolically by using the symbolic computation tool such as Maple, and then, the differentiation can be carried out easily. An algorithm based on Lagrange polynomial is developed to ensure efficiency and accuracy associated with numerical differentiation. The derived Jacobian matrix for a system is proved to be valid and accurate both analytically and through solution of numerical example. In order to verify the accuracy of a program, I was verified applying the 4-bar system.

4,000원

28

전압 관찰을 위한 CMOS 전압 조절기 설계

권승탁, 문하영, 이계철

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.981-986

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In this paper, we present a CMOS voltage regulator for application in electric device. This works shows that unlike the traditional voltage converter, this regulator can achieve high efficiency with a good step-down voltage ratio. The circuits which are implemented in this paper is simulated with LT SPICE tool of computer.

4,000원

29

수직축 소형풍력발전기의 허브 구조 변경에 관한 연구

김진택, 지창헌

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.987-992

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The lay outs in this thesis is based on basic theories and the test the performance of the product by wind tunnel test and vehicle test. Furthermore, in order to find out the effect of structure change on hub which is one of the components of wind turbine, I compared the actual performance between the existing model and the modified model thoroughly. To improve the performance of wind turbine, I modify the structure of the hub and analysing base model and modify model by using Star-CCM+. As a result, I found out the wing-shaped hub used model stablizes the spin in shorter time than existing model. Therefore, with the optimal blade selection, the structure modification on hub is a considerable variable on wind turbine design which is aiming better performance.

4,000원

30

용접 전극봉용 커터의 경화 열처리에 관한 해석적 연구

김기선

한국기계기술학회 한국기계기술학회지 제15권 제6호 2013.12 pp.993-998

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In this paper, heat treatment on the cutting device for automatic welding electrode is proposed. The electrode can be fed continuously by general automatic welding. When the leading end of wire is bent, it must be cut with the constant length. The wire has been cut by manual method previously but the automatic cutter device is proposed and designed in this study. These new device parts are designed and the heat treatment of cutter is determined analytically. The numerical three-dimensional analysis is carried out by means of DEFORMTM-HT, the common heat-treatment software. The meshes are divided with tetrahedral elements. As the result, the highest hardness is observed at the end edge of cutter and especially the hardness at edge is reached even HRc 64.3. The layer, 90% of which consists of martensite structure, is extended to the end edge of cutter. And the layer, 50% of which consists of the micro-structure, becomes its middle area. Because the mechanical property can be predicted by this analytical approach, it is not necessary to have any onsite heat treatment. The life of cutter can be improved by using this study result.

4,000원

 
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