• Journal of Korean Electronics
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• v.13 no.12
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• pp.14-14
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• 1993

• Journal of Korean Electronics
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• v.14 no.12
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• pp.4-13
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• 1994

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.179-184
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• 1995

A new cutting parameter is defined in the spherical part of ball end-mill cutter. A series of slot cutting experiments were carried out to obtain the cutting parameter. The cutter contact area is expressed as the grid posiotion in the cutting plane using Z map. The cutting forces in each grid are calculated and saved as force map, prior to the average cutting forces calculation. The cutting force, in the arbitrary cutting area, can be easily calculated by summing up the cutting forces of the engaged grid in the force map. This model was verified in the inclined surface cutting by cutting test of a cylindrical part.

• Proceedings of the Korea Contents Association Conference
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• 2015.05a
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• pp.173-174
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• 2015

간에서 발생하는 악성종양과 양성종양의 대표적 질환 으로는 간세포암(Hepatocelluar carci- noma, HCC)과 간혈관종(Hepatic hemangioma, HH)이다. CT검사를 이용한 진단에 있어서 두 질환은 시간변화에 따른 조영증강양상 차이가 나타난다. Liver 3-phase computed tomography검사를 시행하여 시간별 조영증강 양상을 알아보았다. 본 연구는 조영제 주입전, 동맥기(35sec), 문맥기(70sec), 지연기(180sec)에 대한 Enhan -cement Pattern 변화와 HU(Hounsfield unit)값 변화, pixel값 변화의 관찰로서 검증하였다. 실험결과 HU를 사용한 방법에서 의미있게 구분되었고 임상적용 시 판독에 도움을 줄 것으로 생각한다.

• Korean Journal of Computational Design and Engineering
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• v.3 no.3
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• pp.161-167
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• 1998

Cutting forces in ball-end milling of slanted surfaces are calculated. The cutting area is determined from the Z-map of the surface geometry and current cutter location. The obtained cutting area is projected onto the cutter plane normal to the Z-axis and compared with cutting edge element location. Cutting force is calculated by integration of elemental cutting forces of engaged cutting edge elements. Experiments with various slanted angles were performed to verify the proposed cutting force estimation model. It is shown that the proposed method predicts cutting force effectively for any geometry including sculptured surfaces with cusp marks and surfaces with pockets and holes.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.900-905
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• 2006

5678SMRT (Seoul Metropolitan Rapid Transit Co) by a ATC/ATO system the other side which is operated with an automatic movement with a manual operation, the Seoul subway 1.2 lines ATS and 3.4 lines adopt a ATC method and they are operated. But it is improving progressively in SMRT railway ATO method. The ATO the operation method leads exchange of information of wayside and train system for and it is possible, the TWC system configuration is becoming wayside and train system and the radio antenna. It discussed the equipment for a TWC system and a automatic operation from the dissertation which it sees. It investigated a data exchange, a message format and an interface control method and it joined in and a system maintenance conservative method it discussed.

• The Journal of the Korea Contents Association
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• v.15 no.9
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• pp.411-417
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• 2015

To distinguish between HCC and HH is one of the important test methods in determining the treatment method by determining the treatment method by distinguishing malignant growth and benign tumors in liver CT scan. Currently, the specialist is reading CT images by their subjective judgment. So, the purpose of this study is to treat reading the CT images even more objective way. The test times after injection contrast medium in this study are the before injection phase(Pre.), artery phase(35sec), portal phase(70sec) and delay phase(180sec). The general pattern change of HCC in change of contrast enhancement pattern shows 26.6% matching. And the case of HH shows 16.6% matching. In order to observe the change of HU value between HCC and HH, each average values and standard deviation was confirm and as a result, it shows the lagre difference between artery and portal phase in lesion.(HCC$19.76{\pm}23.52$, HH$60.23{\pm}29.43$). And it shows the 76.6% matching in HCC and 80.0% matching in HH. Thorough this study, to suggest a HU value as objective analysis method and if the anlaysis method was used in clinical will assist in the diagnosis.