• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.892-897
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• 2000

In this study, tap wear was analyzed not only to predict the tap life time but also to propose an improved tap design. Because rake angle and thread relief of tap are the significant factors in geometry of tap, these two factors were picked as the experiment variables. The experiment was conducted with six types of tap which have 6$^{\circ}$ , 8$^{\circ}$ and 12$^{\circ}$ of rake angles with 0,08mm and 0.14 mm of thread relief. From the measured cutting force, it could be known that cutting torque was low at the large the rake thread relief and tool life was long as rake angle became large. Eventually, tool life is longest when rake angle is 12$^{\circ}$ and the with 0.08mm thread relief. Aand the width of crater wear and that of flank wear were measured when a tapping torque was 20 [$kg_f$-mm] . Most of the measured values were above the width of tool wear[$V_B$=O.O3m], which means that tool life is over.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.114-118
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• 1996

Evaluation of cutting condition is one of the most important aspect to improve productivity and quality. In this study, the wear and cutting characteristics(cutting force, acoustic emission signal and surface roughness) of ceramic cutting tool for hardened die material(SKD11) were investigated by experiment. Flank wear on relief face of tool was occurred more dominant than crater wear on rake face. Experiments were performed under the various cutting condition.

• 대한기계학회논문집A
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• 제27권3호
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• pp.357-362
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• 2003

Recently, the demand for advanced technology of high precision and high efficiency processing of hard materials such as inconel is increasing with progress of industrial goods. However, the machinability of inconel is very inferior to the other conventional industrial materials and the machining technology for inconel involves many problems to be solved in machining accuracy, machining efficiency, etc. Therefore it is needs to establish the machining technology. The purpose of this study is to develop an advanced ultrasonic vibration machining technology for inconel, using the 60KHz and 75KHz high frequency, amplitude about 8${\mu}{\textrm}{m}$ and 4${\mu}{\textrm}{m}$, respectively. As the result, this new ultrasonic vibration machining is reasonable and suitable for the high efficient. accuracy machining method of inconel.

• Journal of Korean Neurosurgical Society
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• 제29권3호
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• pp.365-371
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• 2000

Objectives : To describe a technique for percutaneous vertebroplasty of osteoporotic vertebral body compression fractures and to report preliminary results of its use. Methods : The technique was used over a 8-month period in 9 patients with 10 painful vertebral fractures. The technique involves percutaneous puncture of the involved vertebrae with a Jamshidi needle via a transpedicular approach followed by injection of polymethylmethacrylate(PMMA) into the vertebral body. Results : The procedure was technically successful in all patients, with an average injection amount of 5.9 cc per vertebral body. One patient complained of flank pain postoperatively in spite of improvement in back pain caused by the fractured vertebra. Remaining eight patients reported significant pain relief early after treatment. The patients were followed up for 3 to 15 months(average 7.2 months) and demonstrated no recurrence of pain or aggravation of deformity. Conclusion : Vertebroplasty appears to be a valuable tool in the treatment of painful osteoporotic vertebral fractures, providing acute pain relief and early mobilization in appropriate patients. However, it needs to have more extensive prospective clinical study to confirm its definitive role in the management of this condition.

• 대한암한의학회지
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• 제14권1호
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• pp.53-59
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• 2009

Background & Objective: Regardless of types of cancer, cancer pain means the pain occurred by tumor itself, caused by complication or side effects during treatment and which is neither directly related to tumor nor treatment. This case was performed to relieve the cancer pain and study the effect of moxibustion to the cancer pain. Method: For 27 days, the patient was treated by moxibustion($MANINA^{(R)}$), acupuncture, herbal medicine and narcotic analgesics. We planned to maintain moxibustion on 8 points of Bladder meridian line(BL13, BL17, BL42, BL43) for 20 minutes. The improvement of the symptom was evaluated by BPI/VAS, and the amount of narcotic analgesics applied. Results: The BPI/VAS was declined and amount of applying narcotic analgesics was decreased. Conclusion: It is suggested that moxibustion on BL13, BL17, BL42, BL43 is useful to relief of cancer pain in left flank area.

• Journal of Chest Surgery
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• 제29권2호
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• pp.244-247
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• 1996

다발성 대칭성 지방종증은 경부, 견갑부, 흉부, 복부 및 서혜부에 대칭적으로 피하지방종을 형성하는 드문 질환으로 최근에는 지각 및 자율신경계의 이상동반이 보고되 기도 하나, 현재까지는 원인이 화실하게 밝혀지지 않고 있다. 본 증례는 기관압박을 동반하는 종격동을 침범한 다발성 대칭성 지방종에 대한 증례이다. 환자는 55세 남자로 호흡곤란과 약 10년전부터 서서히 성장하는 경부, 견갑부, 흉부, 복부 및 서혜부의 종괴를 주소로 내원하였으며, 수십년의 심한 음주력이 있었다. 경부와 기관주위를 포함하는 종격동의 지방종괴는 transverse cervical incision을 통해 제거하였다. 그러나 기관주위의 불완전한 지방종괴의 제거로 인한 기관압박의 완화를 위해 술후 15일만에 재수술을 시행하였다. 술후 환자는 종격동기흥 및 피하기종이 심하여 2일 후 응급기관절개술을 시행받은 후, 영구기관절개술후 퇴원하였다.