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고령 환자 골절에서 가골 생성 촉진을 위한 부갑상선 호르몬의 간헐적 투여
송형근 ( Hyung Keun Song ),김성준 ( Sung Jun Kim ),이재후 ( Jae Hoo Lee ),양규현 ( Kyu Hyun Yang ) 대한골절학회 2012 대한골절학회지 Vol.25 No.4
목 적: 고령 환자에서 발생한 분쇄골절에 최소침습 내고정을 시행 후 부갑상선 호르몬의 간헐적 투여가 골절 치유 과정에 미치는 영향을 알아보고자 하였다. 대상 및 방법: 원위 대퇴골 분쇄골절로 최소 침습 내고정을 시행한 환자 중 골질의 약화로 내고정력이 부족하다고 판단된 14명의 환자에게 술 후 부갑상선 호르몬 치료를 권장하였으며, 이 중에서 투약군(제1군, n=7)과 비투약군(제2군, n=7)을 추적 조사하여 최초 가골발생, 가골교 형성 및 골유합 시점을 조사하여 누적발견율(cumulative detection rate, CDR)을 Kaplan-Meier Log Rank test를 이용하여 분석하였다. 결 과: 가골 발생 시기는 제1군에서 평균 6주, 제2군에서 평균 6.7주였으며, 가골교 형성 시기는 제1군에서 15.9주, 제2군에서 23.0주에, 골유합은 각각 평균 28.7주, 41.9주에 관찰되었다. 가골 발생 시기는 두 군에서 CDR의 통계적 차이를 보이지 않았으나(p=0.793),가골교 형성(p=0.008) 및 골유합 시기(p=0.001)는 제1군의 CDR이 증가하였다. 결 론: 고령의 골절 환자에서 부갑상선 호르몬의 간헐적 투여가 가골교의 발생 및 골유합 시기를 단축하며, 유용한 치료법이라 생각한다. Purpose: The purpose of this study was to evaluate the effect of parathyroid hormone (PTH) on fracture healing in elderly patients. Materials and Methods: We analyzed the radiologic results in 14 patients. Group I (n=7) was administrated intermittent PTH after surgical treatment and group II (n=7) was treated only with surgery. We checked the time of initial callus formation, bridging callus formation, and bone union through periodic follow-up radiographs by a radiologist who did not know the patient`s information. Results: The mean time to initial callus formation was 6 weeks for group I, compared with 6.7 weeks for group II. The mean time to bridging callus formation was 15.9 weeks for group I, compared with 23.0 weeks for group II. The mean time to bone union was 28.7 weeks for group I, compared with 41.9 weeks for group II. The difference in the cumulative detection rate (CDR) of the initial callus formation of group I and II was not statistically significant (p=0.793). However, the CDR of the bridging callus formation and bone union for group I were higher than those of group II (p=0.008, p=0.001, respectively). Conclusion: The intermittent PTH administration after surgical treatment and maximum possible preservation of the periosteum in elderly patients accelerates fracture healing.
메탄올 개질 반응기의 수식모델을 통한 정상상태 및 동특성 모사
최영순,송형근,장근수 ( Young Soon Choe,Hyung Keun Song,Kun Soo Chang ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
The methanol-steam reforming reaction has partly its significance in a way of hydrogen production. In this paper, a set of strictly rigorous two dimensional dynamic models for a non-isothermal methanolsteam reformer system was established and these equations were then solved using the numerical method of lines under a given experimental condition. The finite difference approximation method was separately applied to the radial and axial direction to satisfy the criteria of corresponding numerical stability and accuracy. Mainly studied were the steady-state profiles inside the reactor with the variations of the reactor wall temperature, the feed temperature, the feed flow rate and the methanol concentration in the feed. Also, the transient behaviors from the reactor start-up were investigated to identify the dynamic characteristics. The simulation results showed that the controling of the wall temperature and the feed rate accounted for the overall reaction yield.
이주형,여영구,송형근,이광순 ( Joo Hyeong Lee,Yeong Koo Yeo,Hyung Keun Song,Kwang Soo Lee ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.5
A leakage detection method based on a physical model of a pipeline system is proposed. Based on fundamental balance equations for liquid transporation in a pipeline, the method was constructed to diagnose the leak point as well as to detect the leakage. The proposed method was evaluated in a water transporting pipeline system of which the length is 97.6 m and inner diameter is 3/8, respectively. As a result, the method could discriminate the leakage whenever the leaking rate is more than 3% of the total flowrate and localize the leaking point within 3% of accuracy depend on the leaking rate.
노균,여영구,송형근,윤인섭 ( Kun Lo,Yeong Koo Yeo,Hyung Keun Song,En Sup Yoon ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.3
A generalized predictive controller for discrete-time MIMO bilinear processes is derived based on a new bilinear CARIMA model with integral action. Using this model a multi-step ahead optimal predicaor is derived. Two alternative solution methods-rigorous and short-cut-of the minimization problem of a longrange cost-function are introduced and used to calculate control input. Several simulation results show that the proposed control methods have robustness to the limited prior knowledge of the process.
이단 적층 흡착탑을 이용한 CO<sub>2</sub> PSA 공정
이화웅,최재욱,송형근,나병기,Lee, Hwaung,Choi, Jae-Wook,Song, Hyung Keun,Na, Byung-Ki 한국청정기술학회 2001 청정기술 Vol.7 No.1
화력발전소의 연소가스에서 고순도의 $CO_2$를 분리, 회수하는 것을 목적으로, 에너지 비용이 적게 드는 것으로 알려진 PSA(Pressure Swing Adsorption)공정을 이용하였다. 흡착제로서 활성탄 및 제올라이트를 사용하여 연소가스에서 $CO_2$를 회수할 수 있는 장치를 제작하고 이를 조업하는 조건을 확립하고자 하였다. $CO_2$ 회수용으로 적합하지 않다고 알려져 있는 활성탄을 이용하여도 세정단계의 변형을 통한 새로운 사이클을 이용하여 고순도의 $CO_2$를 생성물로 얻을 수 있었다. 또한 활성탄과 제올라이트 각 흡착제의 흡착특성을 이용하여 이들 두 흡착제의 장점을 최대로 이용할 수 있도록 흡착탑의 일부만을 제올라이트 13X를 채워 조업하는 2단 적층 흡착탑을 이용하여 회수율의 향상을 얻을 수 있었다. 흡착탑의 도입부 쪽에 활성탄을, 배출부 쪽에 제올라이트를 채움으로써 최대의 효과를 얻을 수 있었는데, $CO_2$ 농도 13%, 유량 10 SLPM, 흡착압력 2.2기압에서 제올라이트를 부피비로 25%만 사용하여도 40%의 회수율 향상을 얻을 수 있었으며 50%를 이용한 경우에는 회수율이 67%까지 증가하였는데 이는 제올라이트만을 이용한 경우의 회수율과 비슷한 결과였다. In this study, PSA, known as the most economic process, was used to recover $CO_2$ from the power-plant flue gas. Activated carbon and zeolite molecular sieve 13X were used as adsorbent. Activated carbon has been deemed inadequated adsorbent for separating $CO_2$ from the flue gas. However, highly concentrated $CO_2$ could be obtained as a product on the activated carbon adsorbent using the new operating cycle modifying the rinse step. Also, the recovery of $CO_2$ was improved using double-layered adsorption column packed with the activated carbon and the zeolite 13X simultaneously. Adsorption column was filled with the activated carbon in the feed-end side, and the zeolite 13X in the product-end side. The recovery of $CO_2$ increased about 40% with only 25% zeolite, and increased 67% with 50% zeolite at the experimental conditions of 13% $CO_2$ concentration, 10 SLPM flow rate and 2.2 atm adsorption pressure.
활성탄에 대한 CO2 - CO - H2 혼합기체의 흡착평형
문기호,나병기,송형근,서성섭 ( Ki Ho Moon,Byung Ki Na,Hyung Keun Song,Sung Sup Suh ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.5
Adsorption experiments for CO, CO₂, H₂ and their mixtures on activated carbon were performed by static volumetric method. From the parameters obtained from single component adsorption isotherm, multicomponent adsorption equilibria could be predicted and compared with experimental data. Among coupled Langmuir isotherm, coupled Langmuir-Freundlich isotherm, IAST and F-H VST, coupled Langmuir-Freundlich isotherm showed the best agreement with the experimental results for binary and ternary adsorption equilibria of CO, CO₂ and H₂ on activated carbon.