TCD를 이용한 두개강내 동맥류의 예후 예측 가능한 New Scale(NS) Score System

박상훈,박종운,박현선,현동근,하영수,Park, Sang Hoon,Park, Chong Oon,Park, Hyeon Seon,Hyun, Dong Keun,Ha, Young Soo 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.8

Objective : By conducing a review of clinical outcomes for patients with aneurysm treated using current microneurosurgical techniques and intensive care unit management, we speculated that grading systems based only on clinical condition or CT finding after admission failed to provide a significant stratification of outcome between individual grades of patients, because these systems did not include the factor for postoperative vasospasm. We hypothesized that postoperative blood flow velocity could have a significant impact on outcome prediction for patients surgically treated for intracranial aneurysms. Methods : We conducted a analysis on patient- and lesion-specific factors that might have been associated with outcome in a series of 55 aneurysm operations performed with measurements of blood-flow velocity with transcranial Doppler ultrasonography(TCD). In the new scale(NS) score system, 1 point is assigned additionally for the case with Hunt and Hess(H-H)/World Federation of Neurological Surgeons(WFNS) Grade IV or V, Fisher Scale(FS) score 3 or 4, aneurysm size greater than 10mm, patient age older than 60 years, blood-flow velocity higher than 120cm/sec, and posterior circulation lesion. By adding the total points, a 6-point scale score(score 0-6) is obtained. Results : Age of patient, size of aneurysm, clinical condition(H-H grade and WFNS), FS score, and blood flow velocity(TCD 1day after operation) were independently and strongly associated with long-term outcome. When NS scores were applied to 55 patients with at least 6 months follow-up, the correlation of individual scores with outcome was strongly validated the retrospective findings. Conclusion : It was speculated that TCD could be used to assess postoperative vasospasm and to monitor noninvasively the patients with aneurysmal SAH. This NS score system is easy to apply, divide patients into groups with different outcome, and is comprehensive, allowing for more accurate prediction of surgical outcome.

고에너지 밀링분말과 급속소결을 이용한 Ti-Nb-Zr-HA 생체복합재의 기계적 성질 및 생체적합성

박상훈,우기도,김상혁,이승민,김지영,고혜림,김상미,Park, Sang-Hoon,Woo, Kee-Do,Kim, Sang-Hyuk,Lee, Seung-Min,Kim, Ji-Young,Ko, Hye-Rim,Kim, Sang-Mi 한국재료학회 2011 한국재료학회지 Vol.21 No.7

Ti-6Al-4V ELI (Extra Low Interstitial) alloy has been widely used as an alternative to bone due to its excellent biocompatibility. However, it still has many problems, including a high elastic modulus and toxicity. Therefore, nontoxic biomaterials with a low elastic modulus should be developed. However, the fabrication of a uniform coating is challenging. Moreover, the coating layer on Ti and Ti alloy substrates can be peeled off after implantation. To overcome these problems, it is necessary to produce bulk Ti and Ti alloy with hydroxyapatite (HA) composites. In this study, Ti, Nb, and Zr powders, which are biocompatible elements, were milled in a mixing machine (24h) and by planetary mechanical ball milling (1h, 4h, and 6h), respectively. Ti-35%Nb-7%Zr and Ti-35%Nb-7%Zr-10%HA composites were fabricated by spark plasma sintering (SPS) at $1000^{\circ}C$ under 70MPa using mixed and milled powders. The effects of HA addition and milling time on the biocompatibility and physical and mechanical properties of the Ti-35%Nb-7%Zr-(10%HA) alloys have been investigated. $Ti_2O$, CaO, $CaTiO_3$, and $Ti_xP_y$ phases were formed by chemical reaction during sintering. Vickers hardness of the sintered composites increases with increased milling time and by the addition of HA. The biocompatibilty of the HA added Ti-Nb-Zr alloys was improved, but the sintering ability was decreased.

주거건물의 냉방 부하 패턴에 따른 구체축열시스템 운전 방안

박상훈,여명석,유미혜,이유지,정웅준,김광우,Park, Sang-Hoon,Yeo, Myoung-Souk,Yoo, Mi-Hye,Lee, Yu-Ji,Chung, Woong-June,Kim, Kwang-Woo 한국주거학회 2012 한국주거학회 논문집 Vol.23 No.2

Compared to Packaged Terminal Air Conditioning Systems, Radiant Cooling Systems have the advantage of energy saving and thermal comfort. Thermally Activated Building System (TABS) is one of the radiant heating and cooling systems. The main difference between TABS and other radiant systems lies in the usage of the time-lag effect of storing heat energy in the concrete. Current energy usage in summer time is concentrated within a specific time by using Packaged Terminal Air-Conditioner (PTAC). Due to the time-lag effect of TABS, energy usage can be distributed to other time zones. To maximize this effect, it is important to determine the appropriate operating mode, which for TABS is dependent upon the cooling load generated by the occupancy schedule. In this study, occupancy schedules are determined for various residential types. The operating modes of TABS for these residential types are estimated by using a dynamic computational simulation method. The results indicate that the operating modes of TABS can be determined by residential type and occupancy schedule. The load handled ratio by TABS is set up differently according to the cooling load profile obtained from residential type and occupancy schedule. By using TABS, energy consumption could be reduced by 20% compared to PTAC.

발효 , 세포배양 , 생물공정 Acetobacter xylinum BRC5 에 의한 미생물 셀룰로오스의 발효 특성

박상훈,양영국,황정욱,이창승,변유량 ( Sang Hoon Park,Young Kook Yang,Jung Wook Hwang,Chang Seung Lee,Yu Ryang Pyun ) 한국미생물생명공학회 1997 한국미생물·생명공학회지 Vol.25 No.6

가림치료 중 우세안의 시력이 약시안보다 낮아진 환자들의 임상양상

박상훈,장혜란.Sang Hoon Park. MD. Hae Ran Chang. MD. PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.10

Purpose: To investigate the clinical features of patients with decreased visual acuity (VA) of the dominant eye as compared to that of the amblyopic eye during occlusion therapy. Methods: The authors analyzed clinical features of 28 patients with VA reversed between the two eyes during occlusion therapy among 500 patients treated with occlusion therapy under the diagnosis of monocular amblyopia, Results: Twenty-one patients with strabismic amblyopia (SA), five patients with anisometropic amblyopia (AA) and two patients with combined amblyopia (CA) were enrolled in the present study. Decreased VA of the dominant eye as compared to that of the amblyopic eye occurred 66.75 ± 83.63 weeks after the onset of occlusion therapy. Reversion of VA between both eyes occurred during amblyopia treatment in 17 patients and during maintenance therapy in 11 patients. The reversed VA was recovered in all patients. The mean duration (MD) of reversed VA was 15.00 ± 24.43 weeks, and the number of clinic visits (CV) was 4.68 ± 8.65. In five patients, the MD of reversed VA (59.80 ± 30.14 weeks, p = 0.016) and the number of CVs (18.40 ± 14.48, p < 0.001) were significantly longer than those of the other 23 patients (MD of reversed VA: 5.78 ± 4.04 weeks, number of CV: 1.70 ± 1.22); those five patients had low compliances and SAs. Conclusions: Visual acuity was recovered in all patients with decreased VA of the dominant eye as compared to that of the amblyopic eye during occlusion therapy, rapid recovery was observed in most patients except in several patients with low compliance. J Korean Ophthalmol Soc 2010;51(10):1374-1379

공동주택의 유지관리 금융지원을 위한 기초적 연구

박상훈,백정훈,Park, Sang-Hoon,Baek, Cheong-Hoon 한국건설관리학회 2011 한국건설관리학회 논문집 Vol.12 No.2

서울의 경우 세계의 초대형도시에 못지않은 막대한 세대수를 보유하고 있으나, 지금까지 기존의 주택을 활용하거나 재이용하기 보다는 새로운 주택을 건설하는 등 성장위주의 주택정책으로 인해 기존 공동주택을 유지하고 재이용하는 정책개발에 대한 노력은 미비하였다. 서울의 아파트 또는 분당, 일산 등 1기 신도시가 건설된 지 약 20년이 되는 등 개보수가 필요한 수선주기가 다가옴에 따라 기존의 품질을 유지하고, 안전하게 활용하기 위해서는 기존 공동주택의 유지관리를 유도할 수 있는 론(loan) 보조금 세금우대프로그램 등 금융지원이 절실한 실정이다. 따라서, 본고에서는 세계적인 거대도시로서 다양한 주거형태를 보이고 있는 뉴욕시와 도쿄도의 론 보조금 세금우대프로그램 등 금융지원체계를 비교 분석하여 국내에 유지관리금융지원방안을 제안하였다. Seoul, although having a housing stock as huge as that of world metropolitan cities, have implemented growth-oriented policies by constructing new housing units rather than using or rehabilitating existing ones. There were, therefore, few political efforts to preserve and rehabilitate multiple dwellings. Today, substantial time has passed since multiple dwellings in Seoul and the first-stage new cities such as Bundang and Ilsan were constructed. What is required to maintain the quality of the existing housing and use it with safety is loan, subsidy and tax incentive programs which are able to promote the maintenance of existing multiple dwellings. The objective of this study is to compare and analyze the maintenance systems of financial assistance(the loan, subsidy and tax incentive programs)of the world's largest cities with various housing types, I e New York and Tokyo, and then to propose to Seoul a framework for the maintenance systems.

Cross Layer 기반의 무선랜 채널 모니터링을 적용한 네트워크 적응형 HD 비디오 스트리밍

박상훈,윤하영,김종원,조창식,Park Sang-Hoon,Yoon Ha-Young,Kim Jong-Won,Cho Chang-Sik 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.4A

본 논문에서는 IEEE 802.11a 무선랜(WLAN) 환경에서 Cross Layer 기반의 채널 모니터링(Cross-Layered Monitoring: CLM)을 이용한 네트워크 적응형 고선명(high definition: HD) MPEG-2 TS 비디오 스트리밍 시스템을 제안한다. 무선 채널 모니터링을 위해 AE(access point)는 MAC(medium access control) 계층의 전송 상태를 주기적으로 측정하고 응용 계층의 스트리밍 서버로 전달한다. 이것은 비디오 스트리밍 응용 프로그램이 피드백 기반의 종단간 모니터링(End-to-End Monitoring: E2EM) 기법을 적용할 때보다 가변적인 무선 채널 상태에 좀 더 빠르고 효과적으로 적응할 수 있게 한다. 스트리밍 서버는 네트워크에 적응적인 전송을 위해 측정된 무선 채널 상태에 따라 우선순위 기반의 프레임 폐기(priority-based frame dropping)를 수행한다. 이를 위해 스트리밍 서버는 실시간 파싱(real-time parsing)과 프레임 기반의 패킷 우선순위화(frame-based prioritized packetization) 기능을 제공한다. 성능 평가를 위해 IEEE 802.11a 무선랜 환경에서의 다양한 스트리밍 실험을 수행한다. 실험 결과는 제안 시스템이 시간에 따라 가변하는 무선 채널 상태에서 기존 기법에 비해 종단간 비디오 스트리밍의 품질을 향상시킬 수 있음을 보여준다. In this paper, we propose a practical implementation of network-adaptive HD(high definition) MPEG-2 video streaming with a cross-layered channel monitoring(CLM) over the IEEE 802.11a WLAN(wireless local area network). For wireless channel monitoring, AP(access point) periodically measures the MAC(medium access control) layer transmission information and sends the monitoring information to a streaming server. This makes that the streaming server reacts more quickly as well as efficiently to the fluctuated wireless channel than that of the end-to-end monitoring(E2EM) scheme for the video adaptation. The streaming sewer dynamically performs the priority-based frame dropping to adjust the video sending rate according to the measured wireless channel condition. For this purpose, our streaming system nicely provides frame-based prioritized packetization by using a real-time stream parsing module. Various evaluation results over an IEEE 802.11a WLAM testbed are provided to verify the intended QoS adaptation capability The experimental results show that the proposed system can effectively mitigate the quality degradation of video streaming caused by the fluctuations of time-varying wireless channel condition.

전도체 형성 방법에 따른 유무기 복합재료 안테나의 고주파 특성

박상훈,성원모,Park, Sang-Hoon,Seong, Won-Mo 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9

Antennas were fabricated by physical(adhesive) and chemical(deposition+plating) method on organic-inorganic composite material. And antennas were measured dielectric constant and gain. Dielectric constant of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness and number of conduction material composition. But antennas were fabricated by chemical method was reached to 90 % of dielectric material. Gain of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness. But they were unrelated with conduction material composition. The other side antennas were fabricated by chemical method excelled more 0.8 dBic than antennas were fabricated by physical method in gain of antenna. Finally, chemical method can expect excellent product process because it can produce smaller size, higher gain and elimination of many handworks.

연구발표논문초록 : 순환 반응기내에서의 전달현상

박상훈,김영길 (정) ( Sang Hoon Park,Young Gul Kim ) 한국화학공학회 1982 춘계총회초록집 Vol.- No.-

Ag가 함유된 전도성 도료의 제조 조건에 따른 고주파 특성

박상훈,김정표,성원모,Park, Sang-Hoon,Kim, Jeong-Pyo,Seong, Won-Mo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9

Dual band internal antennas were fabricated with Ag conducting paste of various preparation conditions and different print thickness by silk screen print. We have investigated microwave properties were compared Ag conducting paste antenna with copperplate antenna at 800 MHz and 1,800 MHz. Gain of Ag conducting paste antenna was improved when preparation conditions were the single size Ag particle, using dry type resin and high Ag containing percent. However, it was lower than that of copperplate antenna within $0.1\~2.0dBi$ at 800MHz. In addition, it was improved at 800MHz when thickness of Ag conducting paste was printed more than skin depth but it was held after critical print thickness. On the other hand, it was reached level of copperplate antenna at 1,800MHz.