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인구 감소 현상에 따른 목포시 빈집 및 공지의 공간적 분포 전망
조영우 ( Jo Young-woo ),최유빈 ( Choi You-bin ),박찬 ( Park Chan ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2020 한국환경복원기술학회지 Vol.23 No.2
With population losses and stagnant or depressed economies, the local governments embrace shrinkage and accept having a significantly smaller population. Both the initial and ongoing causes of shrinkage hold dramatic effects on the city and its remaining residents. In this context, vacant land increases as an overabundance of unused infrastructure is demolished and municipalities become burdened with increasing maintenance costs of this land. The result is that vacant land often experiences minimal management relative to social norms and have chance to provide a setting for ecological processes with urban rightsizing strategy. Therefore, urban ecosystems undergo major shifts in structure and function. We need to better understand the possibilities of where and how much of houses and land will be abandoned to assist land planners and policymakers to mitigate conflict between optimal ecological and sociological outcomes. This article, therefore, aims to identify distributional characteristics of vacant houses and lands with case study of Mokpo. The study found and verified affecting factors of vacant houses and lands by type through the use of a Maxent model and spatial data that explained housing choice and preference theory. We can predict the vacancies with the spatial variables such as land price, the population ratio over 65, and the distance from security facility. Based on the analysis, the ways of managing housing and land vacancy for sustainable development and ecological restoration method are discussed.
안성찬(Sung Chan An),김승욱(Seung Ook Kim),김준철(Joon Cheol Kim),박승현(Seung Hyun Park),박종후(Jong Hwoo Park),박현중(Hyun Joong Park),조영우(Young Woo Jo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, we will explain the need for a virtual model so-called Digital Twin technology in the ship engine field, and the applications of the virtual models. Unlike small automobile engines, ship engines need a lot of time and cost to do experiments. The development of the virtual models in the field of ship engines is essential to get competitiveness in the ship engine business. Hyundai Heavy Industries (HHI) virtual model technology, which will be introduced in this paper, can be divided into three main areas. Virtual models are used for the following areas: engine design, engine testing, and maintenance. In engine design, a predictive model is constructed based on combustion analysis, structural analysis, and performance analysis to predict engine performance required for designing the target value. For engine testing, the total number of tests can be reduced by using virtual models to determine the direction of the test or in conjunction with existing test data to reduce time and cost. In terms of maintenance, the ship engine’s big data system is used based on numerous engine operating data accumulated so far and is used to predict failures and diagnose engines by utilizing virtual models with AI technology. Lastly, this paper will be concluded by discussing the future of virtual model technology in the ship engine field by introducing “Smart Engine 5.0” which is the future of the virtual model pursued by HHI.
성상신경절 차단시 주입된 국소마취제 양이 동측 상지 피부온도 상승에 미치는 영향
송선옥,조영우 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.2
Background: Horner's syndrome, including ptosis and miosis, is a sign of success following stellate ganglion block (SGB). However, it is not sufficient to ensure adequate sympathetic block to the upper extremity. There are numerous recommended local anesthetic volumes for SGB. The aim of this study was to evaluate the effects of differing volumes used in SGB on the elevation of skin temperature of ipsilateral upper extremity, and to find the volume required to elevate skin temperature most frequently. Methods: Patients with sensory neural hearing loss underwent SGB, repeated daily in the paratracheal approach using different volumes (6, 8, 10, 12 and 16 ml) of 0.2% bupivacaine. Skin temperatures were checked in the hypothenar area before SGB, and 1, 2, 3, 4, 5, 10 and 15 minutes following SGB. Time intervals required for the elevation of skin temperature 1℃ above the preblock level, and for the appearance of Horner's syndrome were recorded. Results: Twenty-three patients repeatedly received SGB over 4 times at different volumes. The total SGB was 100 times, and all displayed Horner's syndrome. The total incidence of skin temperature elevation was 48%. Horner's syndrome appeared prior to the elevation of skin temperature (2.0 ± 2.1 vs 5.3 ± 3.8 min). There were significant differences in the incidence of skin temperature elevation, depending on the volume of the local anesthetics; 6 ml (17.6%), 8 ml (34.8%), 10 ml (52.2%), 12 ml (73.9%) and 16 ml (57.1%); greater volumes resulted in high incidences (pearson chi-square test, P = 0.005). The volume of twelve ml resulted in the highest incidence. Each patient needed different minimal volume to lead to the skin temperature elevationl; 6 ml (13.1%), 8 ml (21.7%), 10 ml (17.4%), 12 ml (26.1%) and 16 ml (4.4%), and several patients (17.4%) did not have elevated skin temperature at any volumes. Conclusions: This study reveals that a large volume of local anesthetic (e.g. 12ml) is needed in SGB for adequate sympathetic blockade to the upper extremity, and that each patient needs a different minimal volume for the skin temperature elevation to occur. (Korean J Anesthesiol 1999; 37: 233~239)
뇌 수술 직후 검사실로 이동하는 환자를 위한 정맥 마취의 유용성
김성기,박대팔,조영우,서일숙 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.4
Background : In most brain operations, the endotracheal tube is kept in postoperatively for airway maintenance during radiologic examinations. But the endotracheal tube causes tracheal irritation and hemodynamic changes. Inhalation anesthetics can not be administered during transport, and minimal concentration is exhaled for several hours after the end of inhalation. The present study was designed : (1) to determine the end tidal isoflurane concentration after the end of administration ; (2) to investigate the effects of intravenous anesthetics in patients with tracheal intubation during radiologic examination postoperatively. Methods : We selected forty adult patients who were scheduled for elective neurosurgical operation with postoperative brain CT (computerized tomography). The study was performed in 2 steps; in the step 1 (n = 10), end tidal isoflurane concentration was checked after ending inhalation. In the step 2 (n = 30), patients were divided into one of three groups according to anesthesia method; group I (using isoflurane), group P (change from isoflurane to propofol about an hour before operation end), group M (using midazolam instead of propofol, compared to group P). In each group, the frequency of bucking and incidence of hypertension were checked during postoperative radiologic examinations. Results : Minimal concentrations of isoflurane were detected in exhaled gas for about 2 hours after the end of isoflurane inhalation. The frequency of bucking was significantly lower in the group P and M than in group I (P = 0.002). In group P, the incidence of hypertension was significantly reduced compared to group M and I (P = 0.031). Conclusions : These results suggest that the change of anesthetic technique (from inhalation to intravenous) in the late period of operation, provides postoperative hemodynamic stability, a more comfortable state and minimal environmental pollution in comparison to inhalation anesthesia only. (Korean J Anesthesiol 1999; 37: 588∼595)