• 한국멀티미디어학회논문지
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• 제24권2호
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• pp.199-207
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• 2021

It is very important to support real-time on the inspection equipment based on Windows. In particular, in the system using MIL-STD-1553B communication, which is widely used in military weapon systems, real-time is required for inspection equipment that uses mostly platforms based on Windows such as Industrial PCs. However, in order to use a complete real-time operating system such as VxWorks, the purchase cost is expensive and the implementation is complicated on the system, so it is not suitable for inspection equipment that requires simple functions to just check go or no-go. Therefore, in this paper, a Real-Time implanted Kernel(RTiK) in the Windows kernel is implanted in order to improve these defects, and real-time performance is implemented for periodically MIL-STD-1553B communication by Deferred Procedure Call(DPC) of Windows. Also, it was verified that the period of up to 2ms was guaranteed with a RDTSC into the EDX:EAX registers for measuring the periodicity.

• The Korean Journal of Pain
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• 제5권1호
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• pp.69-75
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• 1992

The author experienced of four patients with intractable pain who were treated by continuous intraventricular infusion of morphine through an implanted port system. One suffered from tongue cancer and the others from bone metastasis or distant metatasis of abdominal cancer which were ineffectively to managed through an epidural route. Our experience is that this is a safe and effective method of pain management in patients with head and neck cancer. It is useful as well in patients who have intractable pain that cannot be managed through an intrathecal or epidural route.

• The Korean Journal of Pain
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• 제3권1호
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• pp.11-14
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• 1990

Thirty-two cancer patients were treated with various pain control methods. In those who had localized pain or more than 1 year life expectancy. The author preferred neurolytic blockade for whom had localized pain or had more than 1 year life-expectancy to epidural or intrathecal narcotics. The latter methods were saved as a last resort. Effective pain relief was achieved in over 80% of those treated. There were no serious complications. Of the 12 epidural or intrathecally implanted catheter with subcutaneous tunneling cases, successful pain management was possible throughout the remainder of life which was from 1 week to 6 months.

• 대한전자공학회논문지SD
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• 제37권3호
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• pp.6-13
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• 2000

실리콘 기판에 질소를 이온주입한 다음에 게이트 산화막을 2nm, 3nm, 4nm 두께로 성장시켰다. 질소이온주입 에너지는 25keV로 고정하였고 이온주입량은 5.0×10/sup l3//cm/sup 2/과1.0×10/sup 14//cm/sup 2/으로 나누어서 진행하였다. 질소이온주입량과 산화막의 성장률은 밀접한 관계가 있으며 질소이온주입량이 많아지면 산화막의 성장시간이 늘어난다. 같은 두께를 기르는데 필요한 산화시간을 질소이온주입을 하지 않은 경우와 비교하면 질소이온 주입량이 5.0×10/sup 13//cm/sup 2/ 일 때는 약 20%, 1.0×10/sup 14//cm/sup 2/일 때는 약 50% 정도 산화시간이 증가한다. 질소이온 주입량이 증가함에 따라 Q/sub BD/값은 감소하는데 이의 개선을 위해 질소이온주입후에 N/sub 2/분위기에서 850℃ 60분간 열처리를 한 다음 산화막을 성장시키면 Q/sub BD/값이 증가하여 개선됨을 보인다. 이것은 질소이온주입으로 인한 손상이 게이트 산화막의 신뢰성에 나쁜 영향을 미치지만 이온주입직후에 적절한 열처리 공정을 거치면 이러한 손상으로 인한 영향을 없앨 수 있다는 것을 의미한다.

• 센서학회지
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• 제19권5호
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• pp.361-368
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• 2010

ACROSS device, which is composed of an implantable microphone, a signal processor, and a vibrating transducer, is a fullyimplantable middle ear hearing device(F-IMEHD) for the recovery of patients with hearing loss. And since a microphone is implanted under skin and tissue at the temporal bones, the amplitude of the sound wave is attenuated by absorption and scattering. And the vibrating transducer attached to the ossicular chain caused also the different displacement from characteristic of the stapes. For the gain control of auditory signals, most of implantable hearing devices with the digital audio signal processor still apply to fitting rules of conventional hearing aid without regard to the effect of the implanted microphone and the vibrating transducer. So it should be taken into account the effect of the implantable microphone and the vibrating transducer to use the conventional audio fitting rule. The aim of this study was to measure gain characteristics caused by the implanted microphone and the vibrating transducer attached to the ossicle chains for the gain compensation of ACROSS device. Differential floating mass transducers (DFMT) of ACROSS device were clipped on four cadaver temporal bones. And after placing the DFMT on them, displacements of the ossicle chain with the DFMT operated by 1 $mA_{peak}$ current was measured using laser Doppler vibrometer. And the sensitivity of microphones under the sampled pig skin and the skin of 3 rat back were measured by stimulus of pure tones in frequency from 0.1 to 8.9 kHz. And we confirmed that the microphone implanted under skin showed poorer frequency response in the acoustic high-frequency band than it in the low- to mid- frequency band, and the resonant frequency of the stapes vibration was changed by attaching the DFMT on the incus, the displacement of the DFMT driven with 1 $mA_{rms}$ was higher by the amount of about 20 dB than that of cadaver's stapes driven by the sound presssure of 94 dB SPL in resonance frequency range.

• The Korean Journal of Pain
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• 제9권2호
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• pp.439-442
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• 1996

Continuous epidural analgesia has been used widely for chronic pain control, especially in cancer patients. As one of the complications, paraplegia developed during continuous epidural analgesia may be caused by epidural abscess, epidural hematoma, neural damage, chronic adhesive arachnoiditis, anterior spinal artery syndrome, delayed migration of extradural catheter into subdural space or subarachnoid space and preexisting disease. A 55-years-old male with lung cancer was implanted with continuous thoracic epidural catheter for pain control. Twenty days after catheterization, moderate back pain, weakness of lower extremity and urinary difficulty were developed. We suspected epidural abscess at first and made differential diagnosis with MRI which showed metastatic cancer at T2-4 spine, And compressed spinal cord was the main cause of the lower extremity paralysis.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.699-702
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• 2002

Shunt valves implanted in the subcutaneous tissue of brain to treat patient with hydrocephalus were numerically simulated to investigate influence of pressure pulsation on their flow control characteristics. Shunt valves are subjected to pressure variation since ventricles enclosing the brain are under pressure pulsation rather than uniform pressure due to blood pressure variation. We modeled flow orifice through shunt valve and imposed pulsating pressure and valve diaphragm movement to compute flow through the valve. The results of our study indicated that flow rate increased by $40{\%}$ by introducing pressure pulsation and diaphragm movement on the shunt valve. Our results demonstrate the pressure-flow control characteristics of shunt valves unplanted above human brain may be quite different from the characteristics obtained by syringe pump test with uniform pressure and no diaphragm movement.

• 제어로봇시스템학회논문지
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• 제1권2호
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• pp.127-134
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• 1995

For use in patients with severe forms of heart disease for which no surgical repair is possible, development of artificial hearts has many importance in point of economics, medical and industrial applications. To provide a sufficient cardiac output to the physiological demands of circulatory systems is the objective of control systems for an electromechanical artificial heart, which is based on the stable controller design for the motor in the artificial heart. In this paper, an implantable microcontroller-based brushless DC motor control system with the implantability, reliability, and stability is introduced. The developed control system for the artificial heart has the following advantages: (1) It is possible to be implanted in a body by realizing the fundamental functions such as a motor speed detection, proportional-intergral control, timer, and PWM generation through a software programming. (2) Thus, the power consumed in the controller is reduced. (3) The reliability and stability are improved through the reduction of electronic parts and line connetions at the controller. The performance of the artificial hearts and control system developed was evaluated through a series of mock circulatory experiments and a reliability test for one and half years. A sheep with the artificial heart and control system was survived for three days.

• Journal of Periodontal and Implant Science
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• 제40권1호
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• pp.11-18
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• 2010

Purpose: Significant interest has emerged in the design of cell scaffolds that incorporate peptide sequences that correspond to known signaling domains in extracellular matrix and bone morphogenetic protein. The purpose of this study was to evaluate the bone regenerative effects of the synthetic peptide in a critical-size rat calvarial defect model. Methods: Eight millimeter diameter standardized, circular, transosseus defects created on the cranium of forty rats were implanted with synthetic peptide, collagen, or both synthetic peptide and collagen. No material was was implanted the control group. The healing of each group was evaluated histologically and histomorphometrically after 2- and 8-week healing intervals. Results: Surgical implantation of the synthetic peptide and collagen resulted in enhanced local bone formation at both 2 and 8 weeks compared to the control group. When the experimental groups were compared to each other, they showed a similar pattern of bone formation. The defect closure and new bone area were significantly different in synthetic peptide and collagen group at 8 weeks. Conclusions: Concerning the advantages of biomaterials, synthetic peptide can be an effective biomaterial for damaged periodontal regeneration.

• 한국임상수의학회지
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• 제30권4호
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• pp.241-246
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• 2013

The objective of this study was to investigate the effects of implanted chitosan applied to surgically created wound in Japanese Macaque monkeys. 4 healthy Japanese Macaque monkeys were used. A 4 cm straight skin incision was made and undermined skin ($4{\times}4cm$) over on the 2 monkeys both sides of the dorsal midline, and a 4 cm circular skin incision was made on 2 monkeys both sides of the dorsal midline. One wound (left side) was implanted 1 mg (straight incision) and daily 0.2 mg (circular incision) of cotton type chitosan and the other wounds were treated with normal saline (3 ml) in monkeys. Each straight wound was closed with two interrupted sutures of 2-0 sutures. The monkey's circular skin incision is opened. At 14 days after initial wounding, each wound was taken for histological observations in monkeys. The inflammatory cells in the chitosan group are observed less than the control group, the collagen and the fibrin in the chitosan are observed more than the control group in monkeys. So the wound healing is moderately enhanced for chitosan treatment. The fibroblasts and the capillaries increased for chitosan treatment. The treatment of chitosan in wound is to promote healing.