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외과적 보조의 급속상악확장술 : 치험 5예 REPORT OF 5 CASES
박충열,이용욱,송종운,김영운,박홍주,오희균,유선열,이기현,황현식 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1
Five adults (3 cases of bilateral posterior crossbite, 2 cases of unilateral posterior crossbite) with intermaxillary discrepancy of over 5㎜ due to maxillary transverse deficiency were treated by surgically assisted rapid maxillary expansion (SARME). Bilateral maxillary horizontal osteotomies, osteotomies of pterygomaxillary junction and anterior lateral nasal wall, ans anterior palatal osteotomy were performed in 4 cases, and unilateral osteotomies in 1case, followed by palatal expansion with tooth-borne orthopedic applicance. No significant complication was observed. The mean palatal expansion was 7.2㎜ (5.8∼10.0㎜) in the maxillary first molar region. During the mean follow-up period of 4 years (5 months∼8 years 7 months), no recurrence of crossbite was observed in all cases. The SARME seemed to be a simple, stable, and reliable procedure for achieving a permanent increase of over 5㎜ in skeletal maxillary transverse width of adults.
유종현 ( Jong-hyeon Ryu ),김병삼 ( Byoung-sam Kim ) 한국환경기술학회 2014 한국환경기술학회지 Vol.15 No.2
소음은 인간이 원하지 않은 소리이다. 소음은 인체에 정신적, 육체적으로 해로운 소리이다. 20세기에 들어 항공 산업이 모든 분야의 첨단기술을 활용하는 종합산업으로 발전하게 되고 인류가 세계화되어 가면서 항공기의 운항횟수 또한 계속해서 증가되고 있다. 많은 훈련용 항공기의 소음 측정은 항공기 훈련장에 한정되었다. 실제로 측정된 소음 데이터는 항공기 평균 소음 데이터로 구성되었다. 결론적으로 피스톤 엔진 항공기는 저고도, 저속에서 고성능 제트 항공기보다 소음 폭로 시간이 더 길다는 것을 알게 되었다. 이러한 항공기 소음에 대한 피해를 줄이기 위하여 청각 훈련에 의한 소음의 충격을 분석하였다. 반복적인 실험을 통하여 훈련장 인근 지역에 영향을 미치지 않는 최상으로 비행 항로를 제안할 수 있다. Noise is unwanted sound. Noise is nerve jarring sound or mentally and physically harmful sound to the human body. In the 20th century, the aviation industry have been comprehensive industry of all areas and humanity have been globalized, the number of aircraft operated have been increased continuously. Actual noise measurement of many trainers is limited at the airfield. The actual measured noise data was consistent with the aircraft average noise data. As a result, we found that piston engine aircraft, have more exposure noise time than high performance jet aircraft at low altitude low speed is to be the cause. To propose radical countermeasures that noise damage can be reduced, we analyzed noise impact by applying several scenarios. As these repeated experiments, we can suggest best flight route without overlapping with residential area and without affecting flight safety.
Ryu, Jiheon,Kim, Kiho,Lim, Tae Hyun,Kwon, Hae-Ok,Kuk, Jeong Hyeon,Choi, Jin Soo,Baek, Sung-Hyun,Yu, Jong-Won IEEE 2019 IEEE antennas and wireless propagation letters Vol.18 No.4
<P>This letter presents a directive integrated-antenna-source (DIAS) for a high-power ultrawideband parabolic reflector system. Unlike the previously developed omnidirectional integrated-antenna-source (OIAS) that leads to spillover loss in a high-power parabolic reflector system, the proposed DIAS reduces the spillover loss in the system. The DIAS is designed by cutting away the halves of the two electrodes in the OIAS. The DIAS-based reflector system was designed through numerical electromagnetic simulations. The proposed DIAS was fabricated for validation. The proposed DIAS shows 3 dB beamwidths on the <I>H</I>-plane and <I>E</I>-plane of 234° and 116°, respectively, in the peak electric-field patterns. In addition, the DIAS has a much smaller capacitance than the OIAS. The proposed DIAS-based reflector system has a peak electric-field strength of 39.5 kV/m at a distance of 40 m. The results show that, although the DIAS has a much smaller capacitance than the OIAS, the DIAS-based reflector system is capable of producing high-power electromagnetic pulses similar to those of the OIAS-based reflector system.</P>
Mobile Target Speed Estimation in Urban Environments with Adaptive Power Control
Hyeon-Cheol Lee,Jong Tae Lee,Sang Burm Ryu,Eun Su Kang 한국위성정보통신학회 2016 한국위성정보통신학회논문지 Vol.11 No.1
The adaptive power control of Code Division Multiple Access (CDMA) systems for communications between User Equipments (UEs) with a link-budget based Signal-to-Interference Ratio (SIR) estimate which has distance information is applied to three inner loop power control algorithms. The speed estimation performances of these algorithms with their consecutive Transmit-Power-Control (TPC) ratios are compared to each other, and it is concluded that the speed can be estimated using the TPC ratio information of Consecutive TPC Ratio Step-size Closed Loop Power Control (CS-CLPC) and Fixed Step-size Power Control (FSPC).
Ryu, Jong Hwa,You, Young Gyu,Kim, Sung Won,Hong, Jun Ho,Na, Jeong Hyeon,Jhang, Sung Ho Elsevier 2020 CURRENT APPLIED PHYSICS Vol.20 No.2
<P><B>Abstract</B></P> <P>The effect of Al<SUB>2</SUB>O<SUB>3</SUB> deposition on electrical properties and ambient stability of few-layer MoS<SUB>2</SUB> transistors is investigated. The deposition of Al<SUB>2</SUB>O<SUB>3</SUB> passivation layer by atomic layer deposition method resulted in the suppression of the hysteresis in the transfer curve and the enhancement of carrier mobility due to high-κ dielectric screening effect. In addition, the negative shift of threshold voltage (enhanced n-doping) and the metal-insulator transition at the carrier density n ~ <SUP> 10 13 </SUP> cm<SUP>−2</SUP> is reported. The Al<SUB>2</SUB>O<SUB>3</SUB> passivation layer helps electrical properties of MoS<SUB>2</SUB> transistor are preserved even after 11 months. Al<SUB>2</SUB>O<SUB>3</SUB> encapsulation provides a facile method to suppress extrinsic effect on the mobility of few-layer MoS<SUB>2</SUB> transistors and to ensure the ambient stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Al<SUB>2</SUB>O<SUB>3</SUB> passivation enhances the mobility of few-layer MoS<SUB>2</SUB> by dielectric screening effect. </LI> <LI> Negative shift of threshold voltage (enhanced n-doping) with Al<SUB>2</SUB>O<SUB>3</SUB> passivation. </LI> <LI> Metal-insulator transition at the current density of ~10<SUP>13</SUP> cm<SUP>−2</SUP>, observed in trilayer MoS<SUB>2</SUB>. </LI> <LI> Al<SUB>2</SUB>O<SUB>3</SUB> passivation provides a facile method to ensure ambient stability. </LI> </UL> </P>
Ryu Jae-Chan,Yoon Jong-Tae,Kim Byung Jun,Kim Mi Hyeon,Moon Eun Ji,Suh Pae Sun,Roh Yun Hwa,Moon Hye Hyeon,Kwon Boseong,Lee Deok Hee,Song Yunsun 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.7
Objective: Three-dimensional rotational angiography (3D-RA) is increasingly used for the evaluation of intracranial aneurysms (IAs); however, radiation exposure to the lens is a concern. We investigated the effect of head off-centering by adjusting table height on the lens dose during 3D-RA and its feasibility in patient examination. Materials and Methods: The effect of head off-centering during 3D-RA on the lens radiation dose at various table heights was investigated using a RANDO head phantom (Alderson Research Labs). We prospectively enrolled 20 patients (58.0 ± 9.4 years) with IAs who were scheduled to undergo bilateral 3D-RA. In all patients’ 3D-RA, the lens dose-reduction protocol involving elevation of the examination table was applied to one internal carotid artery, and the conventional protocol was applied to the other. The lens dose was measured using photoluminescent glass dosimeters (GD-352M, AGC Techno Glass Co., LTD), and radiation dose metrics were compared between the two protocols. Image quality was quantitatively analyzed using source images for image noise, signal-to-noise ratio, and contrast-to-noise ratio. Additionally, three reviewers qualitatively assessed the image quality using a five-point Likert scale. Results: The phantom study showed that the lens dose was reduced by an average of 38% per 1 cm increase in table height. In the patient study, the dose-reduction protocol (elevating the table height by an average of 2.3 cm) led to an 83% reduction in the median dose from 4.65 mGy to 0.79 mGy (P < 0.001). There were no significant differences between dose-reduction and conventional protocols in the kerma area product (7.34 vs. 7.40 Gy·cm2, P = 0.892), air kerma (75.7 vs. 75.1 mGy, P = 0.872), and image quality. Conclusion: The lens radiation dose was significantly affected by table height adjustment during 3D-RA. Intentional head offcentering by elevation of the table is a simple and effective way to reduce the lens dose in clinical practice.
A Dual-Imaging Speed-Enhanced CMOS Image Sensor for Real-Time Edge Image Extraction
Hyeon-June Kim,Sun-Il Hwang,Jae-Hyun Chung,Jong-Ho Park,Seung-Tak Ryu Institute of Electrical and Electronics Engineers 2017 IEEE journal of solid-state circuits Vol. No.
<P>This paper presents a CMOS image sensor (CIS) that extracts a multi-level edge image as well as a human-friendly normal image in a real time from conventional pixels for machine-vision applications, utilizing a proposed speed/power-efficient dual-mode successive-approximation register analog-to-digital converter (SAR ADC). The proposed readout scheme operates in two modes, fine step SAR (FS-SAR) mode and coarse-step single-slope (CS-SS) mode, depending on the difference (Delta) between a chosen pixel and the previous pixel. If a chosen pixel is at a boundary of an object with a large Delta from the previous pixel, the readout ADC works in the CS-SS mode to readout the edge strength (ES), while the FS-SAR mode is applied for other pixels. By displaying the ES, a multi-level edge image can be obtained in a real time along with a normal image with no hardware/time overhead. By saving the MSBs conversion cycles regardless of Delta, the proposed dual-mode readout scheme enhances the readout speed and reduces power consumption. A prototype QQVGA CIS with 10-bit SAR ADCs was fabricated in a 0.18-mu m 1P4M CMOS image sensor process with a 4.9-mu m pixel pitch. With a maximum pixel rate of 61.4 Mp/s, the prototype demonstrated figure of merits of 70 pJ/pixel/frame, 0.35 e(-) . nJ, and 0.34 e(-) . pJ/step.</P>