http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
교합력에 영향을 미치는 몇 가지 임상적 요소에 대한 고찰
박재한 대한치과의사협회 2022 대한치과의사협회지 Vol.60 No.12
Occlusal bite forces are the most critical consideration factor in treatment planning. Measurement methods of occlusal bite forces were developed in a century, and affected factors are studied in many experiments. Gender, age, shapes of facial morphology, teeth position, periodontal states, etc., are revealed affective aspects of the occlusal bite forces. The dental clinician should make a treatment plan by considering occlusal bite forces and would predict the patient's prognosis. In clinical procedures, several specific factors that include endodontic treatment, implant treatment, and complete denture prosthesis cause severe results after treatments. If clinicians do not consider these factors before the treatment procedures, extraction of the tooth, implant, and dismission of the complete denture are struggled by patients. These factors (endodontic treatment, Implant, complete denture prosthesis) cause the changes of occlusal bite forces, and then consideration of these changes makes a great result of treatment. The purpose of this study was to summarize the parts that clinicians can refer to based on reviewing studies on complex factors that affect occlusal bite force.
박재한 대한평형의학회 2016 Research in Vestibular Science Vol.15 No.4
According to the Barany Society classification of vestibular symptoms, positional dizziness or vertigo is defined as dizziness or vertigo triggered by and occurring after a change of head position in space relative to gravity. Thus, positional dizziness or vertigo should be differentiated from orthostatic dizziness or vertigo, which is triggered by and occurs upon rising. Benign paroxysmal positional vertigo (BPPV) is the most common positional vertigo and accompanied by a characteristic paroxysmal positional nystagmus. But a problem occasionally encountered in clinical practice is the presence of a positive history of BPPV with a negative diagnostic maneuver for positional nystagmus. Orthostatic hypo-tension may be dependent upon various neurogenic and non-neurogenic disorders and conditions. Combination of non-pharmacological and pharmacological treat-ment improve orthostatic tolerance.Res Vestib Sci 2016;15(4):107-111
박재한,도영록,김지수 대한의사협회 2018 대한의사협회지 Vol.61 No.1
Although dizziness is common, it is one of the most challenging symptoms in clinical medicine. Defining the type of dizziness has been considered the first step when approaching patients with dizziness. This approach was based on the belief that each type of dizziness reflects a specific underlying mechanism. A more recent approach involves grouping patients into 4 major categories: 1) acute prolonged spontaneous dizziness, 2) recurrent spontaneous dizziness, 3) recurrent positional dizziness, and 4) chronic persistent dizziness and imbalance. Vestibular neuritis and strokes are the most common causes of acute prolonged spontaneous dizziness, and neuro-otologic examination findings play a key role in the differential diagnosis. Careful history-taking is extremely important in diagnosing the disorders that cause recurrent spontaneous dizziness since the findings of the clinical examination and laboratory evaluations are often negative without a confirmatory diagnostic tool. Benign paroxysmal positional vertigo is a predominant cause of recurrent positional vertigo and can easily be treated with canalith-repositioning maneuvers. Chronic persistent dizziness and imbalance occur in various degenerative or psychiatric disorders that frequently require a referral to a specialist. This new approach may be more practical for managing patients with dizziness.
Eu<sup>2+</sup>/Dy<sup>3+</sup> 이온이 도핑된 Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> 분말 합성 및 발광 특성
박재한,김영진,Park, Jaehan,Kim, Young Jin 한국재료학회 2014 한국재료학회지 Vol.24 No.12
$Eu^{2+}/Dy^{3+}$-doped $Sr_2MgSi_2O_7$ powders were synthesized using a solid-state reaction method with flux ($NH_4Cl$). The broad photoluminescence (PL) excitation spectra of $Sr_2MgSi_2O_7:Eu^{2+}$ were assigned to the $4f^7-4f^65d$ transition of the $Eu^{2+}$ ions, showing strong intensities in the range of 375 to 425 nm. A single emission band was observed at 470 nm, which was the result of two overlapping subbands at 468 and 507 nm owing to Eu(I) and Eu(II) sites. The strongest emission intensity of $Sr_2MgSi_2O_7:Eu^{2+}$ was obtained at the Eu concentration of 3 mol%. This concentration quenching mechanism was attributable to dipole-dipole interaction. The $Ba^{2+}$ substitution for $Sr^{2+}$ caused a blue-shift of the emission band; this behavior was discussed by considering the differences in ionic size and covalence between $Ba^{2+}$ and $Sr^{2+}$. The effects of the Eu/Dy ratios on the phosphorescence of $Sr_2MgSi_2O_7:Eu^{2+}/Dy^{3+}$ were investigated by measuring the decay time; the longest afterglow was obtained for $0.01Eu^{2+}/0.03Dy^{3+}$.
Ti-6Al-4V 합금의 알칼리 및 열처리가 인산칼슘 침착에 미치는 영향
박재한,임기정,김상목,김병옥,한경윤,Park, Jae-Han,Lim, Ki-Jung,Kim, Sang-Mok,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.1
The precipitation of calcium phosphate on implant surface has been known to accelerate osseointegration and to enhance osseous adaptation. The present study was performed to examine whether the precipitation of calcium phosphate on Ti-6Al-4V alloy could be affected by the immersion in NaOH solution and heat treatment. Ti-6Al-4V alloy plates of $15{\times}3.5{\times}1mm$ in dimension were polished sequentially from #240 to #2,000 emery paper and one surface of each specimen was additionally polished with $0.1{\mu}m$ alumina paste. Polished specimens were soaked in various concentrations of NaOH solution(0.1, 1.0, 3.0, 5.0, 7.0, 10.0 M) at $60^{\circ}C$ for 24 hours for alkali treatment, and 5.0 M NaOH treated specimens were heated for 1 hour at each temperature of 400, 500, 600, 700, $800^{\circ}C$. After the alkali and heat treatments, specimens were soaked in the Hank's solution with pH 7.4 at $36.5^{\circ}C$ for 30days.The surface ingredient change of Ti-6Al-4V alloy was evaluated by thin-film X-ray diffractometer(TF-XRD) and the surface microstructure was observed by scanning electron microscope(SEM), and the elements of surface were analyzed by X-ray photoelectron spectroscopy(XPS). The results were obtained as follows ; 1. The precipitation of calcium phosphate on Ti-6Al-4V alloy was accelerated by the immersion in NaOH solution and heat treatment. 2. In Alkali treatment for the precipitation of calcium phosphate on Ti-6Al-4V alloy, the optimal concentration of NaOH solution was 5.0 M. 3. In heat treatment after alkali treatment in 5.0 M NaOH solution, the crystal formation on alloy surface was enhanced by increasing temperature. In heat treated alloys at $600^{\circ}C$, latticed structure and prominences of calcium phosphate layer were most dense. On heat treated alloy surface at the higher temperature(${\geq}700^{\circ}C$), main crystal form was titanium oxide rather than apatite. The above results suggested that the precipitation of calcium phosphate on the surface of Ti-6Al-4V alloy could be induced by alkali treatment in 5.0 M-NaOH solution and by heat treatment at $600^{\circ}C$.
소아 세균성 뇌수막염의 원인균과 신경학적 예후에 관련된 인자들의 연구
박재한,이재성,김령,유주희,김경심,김용욱,김은영 조선대학교 의학연구소 2014 The Medical Journal of Chosun University Vol.39 No.3
Retrospective analysis was conducted on the clinical data of 38 cases of bacterial meningitis that were proven by cerebrospinal fluid culture. Each case occurred by GBS (68.4%), Pneumococcus (15.8%), E. coli (5.3%), Streptococcus mitis (5.3%), Streptococcus bovis (2.6%), and Staphylococcus xylosus (2.6%). Compared to 28 cases with normal outcome, 10 cases who died or had adverse outcomes at hospital discharge were more likely to present with coma, seizure (before or within admission, focal, status epilepticus), require pressor or ventilator support, have initial peripheral blood leukocyte count less than 4,000/mm3 or neutrophil count less than 1,000/mm3, and have hydrocephalus or cerebral infarction by brain imaging.