• 한국재료학회지
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• 제9권1호
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• pp.3-7
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• 1999

The change of phosphorescent property with chemical modification and co-doping of Nd as an auxiliary activator in CaAl$_2$$O_4$: Eu\ulcorner, Nd\ulcorner phosphor, employing Nd\ulcornerion(0.6%) and an co-activator maintained its afterglow for 4.5 hours. And also the initial persistent brightness and phosphorescent property were further improved both by substituting Al by B atoms and incorporation of Nd\ulcorner ion. It was found that the persistent time was 30 hours for&Ca(Al_{0.97}\;B_{0.03}) $_2$$O_4$:EU\ulcorner(0.3%), Nd\ulcorner(0.6%) phosphor.

• 사상체질의학회지
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• 제22권3호
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• pp.152-159
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• 2010

1. Objectives: This study aims to report symptomatic improvement of a Soyangin persistent hiccup patient with Hyeongbangdojeoksan. 2. Methods: The patient was treated with Hyeongbangdojeok-san and acupunctural therapy. The patient's chief complaint and ordinaty symptoms were observed during the outpatient care period. 3. Results and Conclusions: In results, Soyangin patients's hiccup and ordinary symptom as well as improved. The management of the constitutional pathological syndromes by constitutional perspective than focusing on the symptoms of hiccups will provide more comfortable life and better health levels.

• Journal of Korean Neurosurgical Society
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• 제53권2호
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• pp.125-128
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• 2013

A 65-year-old man who had lateral cervical disc herniation underwent cervical posterior laminoforaminotomy at C5-6 and C6-7 level right side. During the operation, there was no serious surgical bleeding event. After operation, he complained persistent right shoulder pain and neck pain. Repeated magnetic resonance image (MRI) showed diffuse cervical epidural hematoma (EDH) extending from C5 to T1 level right side and spinal cord compression at C5-6-7 level. He underwent exploration. There was active bleeding at muscular layer. Muscular active bleeding was controlled and intramuscular hematoma was removed. The patient's symptom was reduced after second operation. Symptomatic postoperative spinal EDH requiring reoperation is rare. Meticulous bleeding control is important before wound closure. In addition, if patient presents persistent or aggravated pain after operation, rapid evaluation using MRI and second look operation is needed as soon as possible.

• 노동경제논집
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• 제33권1호
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• pp.53-84
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• 2010

이 논문은 한국노동패널 조사 자료를 이용하여 실직자들이 겪는 임금 손실의 정도를 실직 발생 직후에서 부터 4년 후까지 분석하였다. 종전에 국내에서 이루어진 연구들에서는 주로 실직 직후에 발생하는 손실에 초점이 맞춰졌는데, 실직으로 인한 손실이 지속될 경우 이는 손실을 과소 추정하는 것이 된다. 논문의 분석 결과에 의하면 실직 발생 4년 후에도 실직으로 인한 임금 손실이 유의미하게 지속되는 것으로 나타났으며, 이는 실직으로 인해 발생하는 일자리 경험의 손실과 반복 실직의 발생에 크게 영향 받은 결과인 것으로 나타났다.

• Journal of Chest Surgery
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• 제47권6호
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• pp.533-535
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• 2014

A 56-year-old male presented with severe exertional dyspnea and pitting edema in the lower extremities. The preoperative evaluation demonstrated biventricular dysfunction associated with severe tricuspid valve regurgitation and a persistent left superior vena cava. He was registered as a transplantation candidate, and orthotopic heart transplantation was performed using the standard bicaval technique. The left superior vena cava was connected to the right atrial appendage after the construction of a conduit using the recipient's autologous coronary sinus tissue. One-month postoperatively, computed tomography imagery demonstrated a patent conduit between the left superior vena cava and right atrial appendage.

• 한국대기환경학회지
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• 제29권2호
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• pp.217-227
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• 2013

Passive air samplers (PAS) have been developed since the early 2000s and widely used for the atmospheric monitoring of persistent organic pollutants (POPs). PAS are useful especially for the investigation of source-receptor relationship of POPs because they provide higher spatial resolution data. In Korea, however, only a few research groups have conducted POPs monitoring using PAS. One of the reasons for the limited application of PAS might be due to a complicated calculation method for air concentration. In this study, therefore, we introduced the principle of polyurethane foam (PUF)-PAS, which has been most widely used in the world, and provided an example of the calculation of air concentration of polycyclic aromatic hydrocarbons (PAHs). As all data tables and equations for this calculation were provided, this method can be used for the conversion of the amount of POPs (ng) in a PUF disk to air concentration ($ng/m^3$).

• 한국반도체및디스플레이장비학회:학술대회논문집
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• 한국반도체및디스플레이장비학회 2007년도 춘계학술대회
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• pp.188-192
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• 2007

High brightness and long persistent luminescence phosphor $CaAl_2O_4:Eu^{2+}$ was prepared with varying $Eu^{2+}$ concentration by solid state reaction technique. Synthesized materials were investigated by powder X-ray diffractometer (XRD), SEM, TEM, photoluminescence excitation and emission spectra. Broad band UV excited luminescence of the $CaAl_2O_4:Eu^{2+}$ was observed in the blue region (${\lambda}_{max}\;=\;440\;nm$) due to transitions from the $4f^65d^1$ to the $4f^7$ configuration of the $Eu^{2+}$ ion. The decay time of the persistence indicated that the persistent luminescence phosphor has bright phosphorescence and maintains a long duration. These materials have great potential for outdoor night time displays.

• 한국임상수의학회지
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• 제20권2호
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• pp.248-251
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• 2003

Esophageal obstruction as a result of persistence of the right aortic arch was diagnosed in a 3-month-old male Persian cat. Regurgitation right after weaning and retardation were noted in this cat. Survey radiographic signs on the lateral view include ventral deviation of the thoracic trachea caused by draping of the dilated esophagus over the dorsum of the trachea and a distinct interface of the dorsal wall of the esophagus silhouetting with the cranial thoracic hypaxial muscles. On the ventrodorsal view, the cranial mediastinum was widened with soft tissue density. The trachea was deviated to the right. In an esophagram, the segmental dilation of the esophagus with constriction of the lumen just cranial to the heart base was apparent. Thoracotomy was performed and corrective surgery was carried out. At surgery, it was confirmed that the esophagus was constricted at the cranial to the base of the heart.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.1206-1212
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• 1993

In this paper, an variable structure system with an integral-augmented sliding surface is designed for the improved robust control of a uncertain multi-input multi-output(MIMO) system subject to the persistent disturbances. To effectively remove the reaching phase problems, the integral augmented sliding surface is defined, then for its design, the eigenstructure assignment technique is introduced. To guarantee the designed performance againts the persistent disturbance, the stabilizing control for multi-input system is also designed. The stability of the global system and performance robustness are investigated. The example will be given for showing the usefulness of algorithm.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2001년도 학술대회 논문집
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• pp.189-192
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• 2001

In order to design thermally trigger controlled persistent current switch (PCS) for superconducting magnet system, it is very important to know information of applied adiabatic method and condition to get designed resistance and characteristics In this paper, we used cotton-gummed tape as thermal insulator and derived experimentally averaged thermal conductivity of it around 10K on the assumption that adiabatic structure of PCS is shape of pipe. The result value is about 0.29 W/mK and it is verified reasonable value by computer simulation and experiment of test PCS. Test PCS was designed and manufactured different dimensions. The experimental results of test PCS were in good agreement with the calculated results.