• Journal of the Semiconductor & Display Technology
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• v.19 no.1
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• pp.73-78
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• 2020

There appears lateral capillary force in a hydrophilic flat needle employed for the fabrication of fine organic thin-film stripes, bringing in an increase of the stripe width. It also causes the stripe thickness to increase with increasing coating speed, which is hardly observed in a normal coating process. Through computational fluid dynamics (CFD) simulations, we demonstrate that the lateral capillary flow can be substantially suppressed by increasing the contact angle of the needle end. Based on the simulation results, we have coated the outer surface of the flat needle with a hydrophobic material (polytetrafluoroethylene (PTFE) with the water contact angle of 104°). Using such a hydrophobic needle, we can suppress the lateral capillary flow of an aqueous poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) to a great extent, rendering the stripe narrow (63 ㎛ at 30 mm/s). Consequently, the stripe thickness is decreased as the coating speed increases. To demonstrate its applicability to solution-processable organic light-emitting diodes (OLEDs), we have also fabricated OLED with the fine PEDOT: PSS stripe and observed the strong light-emitting stripe with the width of about 68 ㎛.

• Mass Spectrometry Letters
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• v.4 no.4
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• pp.83-86
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• 2013

A new interface for coupling CIEF and MS using a four-way cross has been developed in a single mechanical system. This new interface could be operated without the electric discontinuity and reinstallation of lines. Additionally, a bare fused silica capillary was facilitated as a spray needle to produce electrospray and to guide catholyte or sheath liquid. Focusing for CIEF was completed in a hanging droplet at the end of spray needle. This capillary spray needle also provided stable spray, enhanced the ionization efficiency and increased sensitivity. Results with carbonic anhydrase I showed that focusing and spraying were well completed with the new interface and the new spray needle.

• Korean Journal of Acupuncture
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• v.31 no.1
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• pp.1-4
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• 2014

Objectives : The capillary destruction has frequently been used to treat telangiectasia in Korean Medicine. The objective of this study was to review of related literature concerning the capillary destruction as treatment for telangiectasia, and to discuss the clinical application of medical devices in accordance with the principles of Korean Medicine. Methods and Results : An extensive traditional literature including Huangdi Neijing were reviewed for identification of relevant evidence for treating telangiectasia. The telangiectasia is simply defined as a dilated, superficial blood vessel. It is called as the tertiary collateral vessel, superficial collateral vessel or Hyulrak(small superficial collateral vessel). The telangiectasia could be due to disturbances in the circulation of qi and blood. According to Huangdi Neijing, one of the oldest traditional literature published in 4th century B.C. through the first century A.D., it is needed to get rid of the vessel by the capillary destruction for treating telangiectasia using lance needle, shear needle, stiletto needle or moxibustion. Several studies have examined that intense pulsed light or laser as new therapeutic tools could have an sufficiently impact on aspects of improving the effectiveness of the capillary destruction. Conclusions : The capillary destruction for the treatment of telangiectasia has been used since two thousand years ago. We suggested that medical devices, such as intense pulsed light or laser, should be used to treat telangiectasia as a safe and convenient intervention in clinical practice of Korean Medicine.

• Tuberculosis and Respiratory Diseases
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• v.70 no.3
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• pp.242-246
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• 2011

Pulmonary capillary hemangiomatosis (PCH) is a rare disease of unknown etiology that is characterized by nodules composed of infiltrating capillary blood vessels. Herein, we describe a case of a PCH-like lesion that was detected by chest computed tomography. Transthoracic needle aspiration resulted in life-threatening hemorrhage. The patient was followed for seven years. He remained in good health and a follow up image showed little interval change.

• Transactions of the Korean Society of Mechanical Engineers
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• v.14 no.1
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• pp.241-250
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• 1990

Characteristic relaxation time and characteristic diffusion time of viscoelastic fluids are determined experimentally by measuring the zero-shear-rate viscosity by falling ball viscometer and the infinite-shear-rate viscosity by capillary tube viscometer. Fluids used in experiments are aqueous solutions of polyacrylamide Separan AP-273 and the polymer concentrations range from 300 to 2000 wppm. A newly designed laser beam and timer system is employed to overcome the difficulty in measuring terminal velocities of the low concentration solutions. Ball removal device is prepared to remove the dropped ball from the bottom of cylinder without disturbing the testing fluid. In order to measure the zero-shear-rate viscosity, densities of hollow aluminium balls are adjusted very close to the densities of testing fluids. Characteristic diffusion time, which is ball viscometer. However, terminal velocity of a needle by falling ball viscometer is not affected by the time interval of dropping needles and characteristic diffusion time is not measured with a dropping needle. Powell-Eyring model predicts the highest values of the characteristic relaxation times among models used for heat transfer experimental works for a given polymer solution. As degradation of a polymer solution continues, the zero-shear-rate viscosity decreases more seriously than the infinite-shear-rate viscosity. Characteristic relaxation times of polymer solutions decreases as degradation continues.

• Laser Solutions
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• v.10 no.1
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• pp.11-17
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• 2007

We presented the proper laser processing conditions for the capillary line marking, which could be applied for the fabrication of injection needles. With changing the parameters such as lamp current, duty cycle and beam amplification factor of beam expander, we evaluated the processing performance considering amount of dross, processing efficiency and processed linewidth in the sample. We could carry out the proper line marking at the condition of 70% lamp current, duty cycle of 7-10% and 6-times amplification of beam diameter. To perform efficient line processing, the utilization of duty cycle of 12% at 80% lamp current was also preferred.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.1
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• pp.83-90
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• 1986

A micro pH-ISFET probe, which can be applied to the in vivo measurements of the hydrogen ion concentration in blood, has been developed, and a measuring system equiped with this probe also developed. The pH-ISFET has been fatricated by employing the techniques of integrated circuit fabrication. Two kinds of micro electrode formed around the sensing gate during the wafer process, and the other is a capillary type of Ag/AfCl/sat. KCI reduced in size. This capillary electrode has shown its good performance characteristics so far in the application with ISFET as well as a commercial one. In order to form a micro pH-ISFET probe, this pH-ISFET and well as a commercial one. In order to form a micro pH-ISFET probe, this pH-ISFET and the capillary electrode were built together into a needle tip having 1 mm inner diameter. The chip size of a twin pH-ISFET is 0.8 mmx1.4 mm, the material of the sensing gate membrane is Si3N4, and the sensitivity of the developed probe is about 52mV/pH.

• Korean journal of food and cookery science
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• v.17 no.2
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• pp.129-138
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• 2001

In this study, development of the pine needle flavor oils and their application to foods, especially to traditional Korean foods, were investigated. The pine needle flavor oils were prepared by the autoclaving method, and their volatile flavor components(VFCs) were determined by capillary gas chromatographic method The major flavor components of the pine noddle flavor oil were a -pinene 31.1%, pentane 9.8%, tricyclene 7.5%, camphene 6.8%, hexanal 6.2%, propane 6.0%, ${\beta}$-pinene 5.6%, limonene 3.9%. The acceptability of the pine needle flavor oils, sensory evaluation including a preference test and quantitative descriptive analysis(QDA), of the pine needle flavor oil, a sesame oil, and a blended oil (pine needle flavor oil : sesame oil 50 : 50 v/v) was carried out. The blended oil and sesame oil showed much higher preference scores than the pine needle flavor oil, and blended oil was almost as acceptable as sesame oil(P ＜ 0.05). The results seem to indicate that blended oil can be used as a unique substitution for sesame oil in some foods, especially in some traditional Koran food.

• Journal of Biomedical Engineering Research
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• v.23 no.4
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• pp.323-327
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• 2002

Chronic diabetic patients need to sample capillary blood for monitoring and controlling the blood sugar level. Frequent sampling requires to minimize pain during skin puncture. The present study developed mechanisms to minimize pain with effective sampling procedure. which consisted of tapered spring, guiding tunnel, and 30G needle Penetration depth was limited to within 2mm for pain reduction as well as for safety. Simple no-reuse mechanism also prevented the cross-patient and secondary infection possibility. Clinical experiments demonstrated the best convenience and safety with minimal pain in the diabetes, normal, and nursing students groups. Sing1e blood sampling was enough for successful blood sugar test by portable analyzer. The present sing1e use auto-lancet should be of great convenience in frequent capillary blood sampling for the diabetes.

• Journal of Korean Foot and Ankle Society
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• v.22 no.4
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• pp.151-155
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• 2018

Purpose: Toe ulcers have been implicated as a causative factor in diabetic foot amputation. The aim of this study was to evaluate the outcomes of percutaneous needle flexor tenotomies of diabetic claw toes with ulcers or pending ulcers. Materials and Methods: The authors undertook a retrospective chart review between January 2014 and June 2016 to identify those patients who underwent a percutaneous needle flexor tenotomy for diabetic claw toe deformities. We evaluated 54 toes in 42 patients. Twenty-four patients were female and the mean age at the time of operation was 57 years. The mean follow-up time was 11 months. Thirty-four patients (46 toes) had tip toe ulcers or pending ulcers and 8 patients (8 toes) had dorsal pending ulcers. All patients had palpable pulses and good capillary refill. Results: Forty-three of 46 tip toe ulcers (93.5%) healed without significant complications and 8 dorsal ulcers showed no specific changes within 5 weeks. There were no recurrent ulcers at final follow-up. Four patients developed transfer lesion of the adjacent toe and needed subsequent tenotomy. Conclusion: Percutaneous needle tenotomy in an outpatient clinic was an effective and safe method for treating toe ulcers in neuropathic patients to offload the tip of the toe so that ulcer healing could occur.