족부 및 족근관절에 발생한 종양 (185예)

최우진,신규호,이진우,한창욱,Choi, Woo-Jin,Shin, Kyoo-Ho,Lee, Jin-Woo,Han, Chang-Wook 대한족부족관절학회 2007 대한족부족관절학회지 Vol.11 No.1

Purpose: Tumors arising in the foot and ankle are uncommon and the malignant tumors are known to be rare compared with those of the other sites. We analyzed the clinical data of patients who have been diagnosed as having a tumor of the foot and ankle. Materials and Methods: From 1989 to 2006, we analyzed 185 patients who have been treated surgically and were pathologically confirmed of having tumors of the foot and ankle. Their clinical characteristics were reviewed retrospectively. Results: One hundred and fifty-seven cases were benign (84.9%) and 28 cases (15.1%) were malignant. 108 cases (58.4%) were benign soft tissue tumors and 49 cases (26.5%) were benign bone tumors. Malignant tumors included 17 cases (9.2%) of soft tissue tumors, 8 cases (4.3%) of primary bone tumors and 3 cases (1.6%) of metastatic bone tumors. The most common benign soft tissue tumor was ganglion (23 cases). Enchondroma (9 cases) was the most common among the benign bone tumors. Malignant peripheral nerve sheath tumor was the most common malignant tumor (4 cases). The predilection site for benign tumors was at the forefoot around toes while for the malignant tumor was around the ankle. 4.6% of benign soft tissue tumors and 8.2% of benign bone tumors had locally recurred and 14 cases (50%) of malignant tumor were confirmed as having distant metastasis. Conclusion: The ratio of malignant tumor and its metastasis rate was high. Therefore, the histopathologic confirmation is essential when treating tumors of the foot and ankle.

위법한 쟁의행위 중 지출된 고정비용의 배상에 관한 검토

최우진 사법발전재단 2019 사법 Vol.1 No.48

위법한 쟁의행위로 조업이 중단된 경우에, 판례는 쟁의행위 중 지출된 고정비용을 법적으로 배상하여야 할 손해로 보고 있다. 비용은 출연자의 위험부담하에 자발적으로 지출되는 것으로서, 손해와 구별되는 개념이므로, 위법한 쟁의행위 중에 비용이 지출되었다는 사정만으로 그것을 언제나 ‘법적으로 배상하여야 할 손해’로 보아야 하는 것은 아니다. 위와 같은 고정비용은, 쟁의행위로 인한 생산량 저하 및 생산되지 못한 제품의 판매 개연성과 이로 인한 판매량 저하 사실이 증명되는 경우에 판매이익의 발생 개연성과 매출이익을 통한 고정비용 정도의 회수 개연성을 추정함으로써, 법적으로 배상하여야 할 손해로 인식할 수 있게 된다. 이에 관해서는 생산량 저하가 판매량 저하로 이어진다는 점이 전제되어야 한다. 다만 종래의 판례에서는, 생산량 저하나 판매 개연성, 이로 인한 판매량 저하 사실에 관한 증명을 완화하거나 이러한 전제사실의 추인에 대한 반증을 제한하는 경향이 드러나고 있다. 이로 인하여 근로자들과 노동조합에 대한 과잉적 손해배상책임을 부과하는 결과가 초래될 수 있으므로, 판례 입장과 경향성에 대한 재고가 필요하다. Nach den koreanischen Rechtsprechungen können Fixkosten im Fälle der Betriebsunterbrechungen durch rechtswidrigen Arbeitskampf als der rechtlich ersatzfähige Schaden angesehen werden. Die Aufwendungen, die jemand auf eigene Gefahr freiwillig aus seinem Vermögen hergegeben hat, sind zwar schlechthin als Schaden nicht zu ersetzen. Bei Produktionsausfällen ist es jedoch wahrscheinlich, dass der geschädigte Arbeitgeber nach dem gewöhnlichen Lauf der Dinge seine Produktion zumindest kostendeckend abgesetzt hätte, wenn er in der ausgefallenen Arbeitszeit Güter erzeugt hätte. Der Schaden besteht daher in Höhe der entgangenen Einnahmen, die durch Erlös am Markt gemachte Aufwendungen gedeckt würden. Insoweit soll es davon ausgehen, dass jeder Produktionsausfall typischerweise zum Absatzausfall führt. Allerdings stehen Arbeitnehmer oder Gewerkschaften der Gegenbeweis offen, dass der gewöhnliche Lauf der Dinge in solchen Fälle anders gewesen wäre, dass die Produktion nicht kostendeckend hätte verkauft werden können. Doch zeigt die Auffassung des obersten Gerichtshofs von Korea gewisse Tendenzen, in denen der Beweis der Basis für derartige Vermutungen, wie Verkaufbarkeit, Produktions- und Absatzausfall, erleichtert wird oder der Gegenbeweis zur Widerlegung der oben genannten Tatsachenvermutungen beschränkt gemacht wird. Dass diese Neigungen eine Ausuferung der Haftpflicht von Arbeitern oder Gewerkschaften verursachen können, ist es zu befürchten und kritisch zu betrachten.

Effects of Deforestation Practice on the Distribution and Abundance of Herpetofauna in Mt. Gariwang, South Korea

최우진,박일국,김종선,구교성,Jung-Hyun Lee,박찬우,양희문,박대식 강원대학교 산림과학연구소 2018 Journal of Forest Science Vol.34 No.2

To know if deforestation practice affects the distribution and abundance of herpetofauna in Mt. Gariwang, South Korea, we conducted field surveys over 12 times both at deforested (n=9 sites) and un-touched (control, n=12 sites) forest areas from March to October, 2017. Each survey site was approximately 100 m long×20 m wide area, which in the middle of the site, mountain road presented. During each survey, we recorded the species and the number of amphibians and reptiles which identified. To compare environments between the two areas, we analyzed eight environmental variables, extracted from digital sources. Overall, we found one amphibian and four reptile species at deforested area, while each five amphibian and reptile species at un-touched area. The number of amphibian species significantly tended to be smaller at deforested area. The number of the survey sites where amphibians found and the number of amphibian individuals showed the same trend. For reptiles, although the number of reptile individuals showed some increases, all variables investigated were not significantly changed by deforestation practice. Our results imply that deforestation practice negatively affects amphibians, but effects of that on reptiles are not evident.

양자 교환막형 연료전지의 등가 임피던스 모델을 이용한 인버터에 의한 맥동 전류의 영향에 관한 연구

최우진,Choi, Woo-Jin 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.6

본 논문에서는 인버터에서 발생하는 맥동전류가 양자 교환막형 연료전지에 미치는 영향을 임피던스 모델을 통하여 분석한다. 제안된 방법은 주파수 응답 분석법을 이용하여 연료전지 스택의 등가 임피던스를 유도하고, 유도된 모델을 이용하여 맥동전류의 영향을 분석한다. 모델을 통해 계산된 결과는 상용 연료전지 스택을 사용한 실험을 통하여 증명된다. 실험결과는 인버터에 의해 발생한 맥동전류로 인해 최대 10(%)까지 연료전지 스택의 출력이 감소할 수 있음을 보인다. In this paper the effects of inverter ripple currents to the Proton Exchange Membrane Fuel Cell Stack (PEMFCS) is analyzed by the impedance model. The proposed method employs the frequency analysis technique to derive an equivalent impedance model of the fuel cell stack and the effects of the inverter ripple current are investigated. The calculated results m then verified by means of experiments on commercially available PEMFCSs. The experimental results show that the ripple current can contribute up to 10[%] reduction in the available output power.

Input-Constrained Current Controller for DC/DC Boost Converter

최우진,김석균,김주용,이교범 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

This paper presents a simple input-constrained current controller for a DC/DC boost converter with stability analysis that considers the nonlinearity of the converter model. The proposed controller is designed to satisfy the inherent input constraints of the converter under a physically reasonable assumption, which is the first contribution of this paper. The second contribution is providing a rigorous proof of the proposed control law, which keeps the closed-loop system along with the internal dynamics stable. The performance of the proposed controller is demonstrated through an experiment employing a 20-kW DC/DC boost converter.

La₂O₃ 첨가에 따른 BaTiO₃의 미세구조 및 유전특성

최우진,문경석,Choi, Woo-Jin,Moon, Kyoung-Seok 한국결정성장학회 2020 韓國結晶成長學會誌 Vol.30 No.3

The effect of La₂O₃ addition on the crystalline phase, microstructure, and dielectric properties of BaTiO₃ has been studied as a function of the amounts of La₂O₃. 0.3 mol% TiO₂-excess BaTiO₃ powder was synthesized by solid-state reaction, and then the powder compacts with various amounts of La₂O₃ were sintered at 1250℃ for 2 hours. Room temperature XRD showed changes in the lattice parameters and a decrease of tetragonality (c/a) as the amounts of La₂O₃ increased. It can be explained that the phase transition from tetragonal to cubic phase occurred because La³⁺ replaced Ba²⁺ site, which increased the instability of the tetragonal phase. As La₂O₃ was added over 0.1 mol%, the critical driving force for growth (Δg_c) increased over maximum driving force (Δg_max). As the result, the grain size decreased with La₂O₃ addition. Dielectric constant decreased as the amounts of La₂O₃ increased, which was analyzed with crystal structure and microstructure. La₂O₃ 첨가량에 따른 결정상 및 미세구조 변화와 유전특성과의 상관관계에 대해 연구하였다. 고상반응법을 이용해 합성된 0.3 mol% TiO₂ 과잉 BaTiO₃ 분말에 대해 La₂O₃ 첨가량을 다르게 첨가하여 1250℃에서 2시간 동안 소결되었다. 상온에서 측정된 XRD는 La₂O₃ 첨가량이 증가함에 따라 lattice parameter가 변화하였고, 정방정비가 감소하였다. 이는 La³⁺가 Ba²⁺ 자리에 치환되어 정방정상의 불안정성을 높여 입방정상으로 상전이 된 것으로 설명할 수 있다. La₂O₃ 첨가량이 증가할 때, 임계입자성장구동력(Δg_c)이 최대 입자성장구동력 (Δg_max)보다 높아져, 입자크기와 밀도가 감소하였다. 유전상수는 La₂O₃가 증가함에 따라 감소하였는데, 이를 결정상 및 미세구조의 변화에 대한 효과로 분석하였다.

전파관리방식의 변화에 대비한 제도 개선 방안에 대한 조사

최우진,석경휴 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.6

주파수의 혼신·간섭 방지를 위해 실제 공중에 방사되는 복사전력 중심으로 규제기준 전환이 요구된다. 복사전력 규제는 기술기준, 허가, 검사 등 전파관리 전반에 관련되는 사항이므로 적용 용이성, 시급성 등을 고려해 점진적으로 도입하고, 주요국의 복사전력 관련 법제도 현황 조사를 통해 국내 환경에 적합한 복사전력 방식에 따른 측정, 검사, 인증 등의 무선설비 출력관리 방식을 마련한다. 국내는 현재 안테나 공급 전력의 비중이 높고, 유럽의 경우는 복사전력의 비중이 높음. 향후 무선국의 수가 점점 증가하고 다양해지므로 공간 관리인 복사전력 기반을 병행하여 측정이 가능하도록 제도개선 마련 필요하고, 복사전력 관리체계로 전환하기 위해서는 관련 전파 제도(기술기준, 인증, 무선국 검사, 사후 관리 등)에 대한 제도개선 필요하다. In order to prevent interference and interference of the frequency, it is required to convert the regulatory standard into the center of the radiation power radiated to the actual public. Since the radiation power regulation is related to general radio management such as technical standards, permits, and inspections, it is gradually introduced in consideration of applicability and urgency, and the radiation power related laws of major countries And a method of controlling the output of the radio equipment such as measurement, inspection, and authentication. In Korea, the proportion of antenna power supply is high, and in Europe, radiation power is high. Since the number of radio stations will increase and diversify in the future, institutional improvement should be made so that it can be measured in parallel with the radiocommunication infrastructure of the space manager. In order to convert to the radiative power management system, the system for the related radio system needs(Technical standards, certification, inspection of radio stations, post-management, etc.) to be improved.

관절경적 미세골절술이 실패한 거골의 골연골 병변에 대한 치료로서의 재차 미세골절술

최우진,박광환,이모세,정광호,이진우,Choi, Woo Jin,Park, Kwang Hwan,Lee, Moses,Chung, Kwangho,Lee, Jin Woo 대한족부족관절학회 2015 대한족부족관절학회지 Vol.19 No.2

Arthroscopic treatment has been reported to provide effective improvement of ankle function when used in treatment of small osteochondral lesion of talus; however, favorable long-term results have been less predictable for large osteochondral lesion of talus. In cases in which primary arthroscopic treatment fails, the decision regarding which subsequent technique to choose has become increasingly difficult, as good clinical outcomes may be unlikely for such patients irrespective of the surgical technique used. Redomicrofracture should be used judiciously for treatment of osteochondral lesion of talus in which arthroscopic treatment has failed.

스마트폰에서 효율적인 봇 탐지 기법

최우진,박지연,정진만,허준영,전광일 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.1

최근 스마트폰의 급속한 확대로 다양한 형태의 보안 위협이 증가하고 있다. 그 중 감염된 스마트폰은 개인정 보 유출뿐만 아니라 사이버 테러와 같은 DDOS 공격에도 악용될 수 있어 매우 위험하다. 하지만 기존 기법들은 배터 리를 사용하는 스마트폰에서는 적합하지 않거나 별도의 저장소를 필요로 하는 문제점이 있다. 본 논문에서는 스마트폰 에서 효율적인 봇 탐지 기법을 제안한다. 제안 기법은 수신 트래픽을 대상으로 탐지하는 기존 기법과 다르게 제안 기 법은 송신 트래픽만을 대상으로 탐지하므로 수신 트래픽보다 송신 트래픽이 적은 스마트폰에서 더욱 에너지 효율적이 다. 또한 의도하지 않은 트래픽을 유발하는 로그 정보들을 외부 통합 서버에 수집하여 봇뿐만 아니라 봇넷을 탐지할 수 있다. 제안 기법을 안드로이드 스마트폰에서 구현하고 성능 평가를 한 결과 효과적으로 봇을 탐지할 수 있음을 확 인하였다. Recently, with increasing use of smartphones, the security threats also have increased rapidly. Especially, the compromised smartphone is very dangerous because it could be exploited in a DDOS attacks such as cyberterrorism as well as in the leakage of personal information. However, most bot detection mechanisms are still unsuitable for smartphone with its lower computing capability and limited battery capacity because they incur additional computational overheads or require pre-defined signatures. In this paper, we present an efficient bot detection mechanism in smartphones. Our mechanism detects effectively bots in outgoing traffic by using a correlation between user events and network traffic. We have implemented its prototype in Android smartphone and measured its performance. The evaluation results show that our mechanism provides low overhead to detect bots in smartphones.

Separation of Individual Plastics from Mixed Plastic Waste by Gravity Separation Processes

최우진,Jae Myong Yoo,Bong Gyoo Cho 한국자원공학회 2006 Geosystem engineering Vol.9 No.3

In Korea, mixed plastic wastes generated from households after hand picking and/or mechanical sorting processes amount to 1,700,000 ton per year in 2005, and most of these waste are finally end up with landfill and/or incineration due to lacks of separation technologies and economical reasons. These plastic wastes can not be used as raw materials for chemical and/or thermal recycling because of their high content of PVC (upto 4.0 wt.%). In the present work, gravity separation system has been developed to remove PVC from the mixed plastic waste and recover the valuable plastics. The separation system mainly consists of air classification, magnetic separation, one-step crushing, feeding system at fixed rate and wet-type gravity separation system. The gravity system based on centrifugal separation has been developed and it consists of mixing, precleaning, separation, dewatering, recovery system, wastewater treatment system, etc. The main objective of this process to be developed is to achieve high separation efficiency of polyolefins (PE, PP, PS) with less than 0.3 wt.% PVC content and less than 10% moisture content in the final products. In addition, crushing unit with 8 rotor system is also developed to improve the crushing efficiency of soft- type plastics. The system with a capacity of 1.0 ton per hour is developed and operational results are presented.