관혈적 정복술 및 내고정술 후 군인에게 발생한 경비골 원위부 골결합증(1예 보고)

이준영,남기영,송경철,Lee, Jun-Young,Nam, Ki-Young,Song, Kyoung-Chul 대한족부족관절학회 2010 대한족부족관절학회지 Vol.14 No.1

The scanty literature on distal tibiofibular synostosis includes descriptions of relatively few specific complaints. Here we report a case of a 24-year-old young soldier who sustained a left ankle lateral malleolar fracture about 6 months ago and was initially treated by the open reduction and internal fixation with plate & screw. But 6 months later, he suffered from an vague ankle pain, each time the symptoms occurred right after an active ambulation, ankle dorsiflexion, especially when he had exercised aggressively. The radiographs revealed that there was a mature distal tibiofibular synostosis. We treated the patient with surgical excision of synostosis. Post-operative condition was satisfied to all concern and the result was found to be excellent during one-year follow-up.

인터넷 중독 고위험 청소년의 성별에 따른 임상적, 정신병리적 특성

이지윤(Ji Yoon Lee),권준근(Jun-Gun Kwon),이준영(Jun-Young Lee),정희연(Hee Yeon Jung),손보경(Bo Kyung Sohn),최삼욱(Sam Wook Choi),김대진(Dai Jin Kim),최정석(Jung-Seok Choi) 한국중독정신의학회 2016 중독정신의학 Vol.20 No.1

Objectives : Most previous studies of Internet addiction (IA) have been performed on males, and little is known about gen-der differences in IA. We examined gender differences in the clinical and psychopathological features related to high-risk for IA among adolescents. Methods : 714 (male : N=389 ; fe-male : N=325) have reported questionnaires as follows ; 1) clinical and psychopathological features (depression, anxiety, Attention Deficit Hyperactivity Disorder (ADHD) symptoms, Smartphone addiction, impulsivity, behavioral inhibition and approach systems, state-trait anger, aggression, beliefs about aggression, and resilience) 2) Internet and Smartphone usage patterns. In 691 who completed the Young’s Internet Addiction Test (YIAT), A total of 487 adolescents were classified into the normal Internet use group, with YIAT scores of 20-39 (male :N=232 ; female : N=255) and 204 adolescents were classified into high-risk for IA group (male : N=144 ; female : N=60). Results : Most factors described above predicted high-risk for IA in male and female adolescents. Especially, the present study found that psychological resilience had negative association with possibility of IA in female, while cognitive impulsivity and hostile aggression were associated with possibility of IA in male adolescents. Conclusion : This study found gender-re-lated features in adolescents at high-risk for IA. Thus, gender-specific strategies are needed to maximize prevention and treatment effectiveness of IA.

경골 천정(pilon) 골절의 최신 치료

이준영,Lee, Jun-Young 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.2

Pilon fractures involving distal tibia remain one of the most difficult therapeutic challenges that confront the orthopedic surgeons because of associated soft tissue injury is common. To introduce and describe the diagnosis, current treatment, results and complications of the pilon fractures. In initial assessment, the correct evaluation of the fracture type through radiographic checkup and examination of the soft tissue envelope is needed to decide appropriate treatment planning of pilon fractures. Even though Ruedi and Allgower reported 74% good and excellent results with primary open reduction and internal fixation, recently the second staged treatment of pilon fractures is preferred to orthopedic traumatologist because of the soft tissue problem is common after primary open reduction and internal fixation. The components of the first stage are focused primarily on stabilization of the soft tissue envelope. If fibula is fractured, fibular open reduction and internal fixation is integral part of initial management for reducing the majority of tibial deformities. Ankle-spanning temporary external fixator is used to restore limb alignment and displaced intraarticular fragments through ligamentotaxis and distraction. And the second stage, definitive open reduction and internal fixation of the tibial component, is undertaken when the soft tissue injury has resolved and no infection sign is seen on pin site of external fixator. The goals of definitive internal fixation should include absolute stability and interfragmentary compression of reduced articular segments, stable fixation of the articular segment to the tibial diaphysis, and restoration of coronal, transverse, and sagittal plane alignments. The location, rigidity, and kinds of the implants are based on each individual fractures. The conventional plate fixation has more advantages in anatomical reduction of intraarticular fractures than locking compression plate. But it has more complications as infection, delayed union and nonunion. The locking compression plate fixation provides greater stability and lesser wound problem than conventional implants. But the locking compression plate remains poorly defined for intraarticular fractures of the distal tibia. Active, active assisted, passive range of motion of the ankle is recommended when postoperative rehabilitation is started. Splinting with the foot in neutral is continued until suture is removed at the 2~3 weeks and weight bearing is delayed for approximately 12 weeks. The recognition of the soft tissue injury has evolved as a critical component of the management of pilon fractures. At this point, the second staged treatment of pilon fractures is good treatment option because of it is designed to promote recovery of the soft tissue envelope in first stage operation and get a good result in definitive reduction and stabilization of the articular surface and axial alignment in second stage operation.

경거골유합술 후 발생하는 불유합과 관련된 인자에 대한 분석

이준영,김보선,이정우,Lee, Jun Young,Kim, Bo Sun,Lee, Jung Woo 대한족부족관절학회 2017 대한족부족관절학회지 Vol.21 No.3

Purpose: The aim of this study was to analyze the factors related to nonunion in tibiotalar arthrodesis. Materials and Methods: Eighty cases of ankle arthritis treated with tibiotalar arthrodesis in our hospital from November 2008 to November 2015 with more than one year follow up were analyzed. Simple anteroposterior and lateral radiographs after 6 and 12 months of surgery were analyzed. Union was defined as more than 50% connection of the trabecular bone at the ankle joint surface in the anteroposterior and lateral radiographs. The nonunion group was defined as no signs of union with persistent pain 9 months after surgery. The surgical approach, type of used screw, preoperative and postoperative ankle alignment, body mass index (BMI), bone mineral density, and patients' prior history were compared between the two groups. Results: There were 69 union cases and 11 nonunion cases. In the patient factors, the gender and BMI was related to nonunion (p<0.05). The mean preoperative and postoperative ankle alignment in the nonunion group was $9.93^{\circ}{\pm}6.92^{\circ}$ and $5.43^{\circ}{\pm}3.35^{\circ}$ respectively, and $9.80^{\circ}{\pm}7.55^{\circ}$ and $5.63^{\circ}{\pm}3.45^{\circ}$ in the union group, respectively; the difference was not statistically significant (p>0.05). In the technical factors, the transfibular approach showed a better relationship but the association was not significant (p<0.05). In 40 cases of the transfibular approach, 12 cases used cancellous screws, and 4 cases showed nonunion due to screw breakage. Conclusion: Technical factors, such as the surgical approach and the type of screw used can be a risk factor in nonunion. In addition, patients' factors, such as gender and BMI, must be considered to reduce the nonunion rate.

무기전계발광 디스플레이 소자 제작 및 광학 특성 연구

이준영,황진하,Lee, Jun-Young,Hwang, Jin-Ha 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3

Statistical designs of experiments were applied in order to understand the effect of processing variables on the brightness of inorganic electroluminescent displays. The main effects and interaction of phosphor and dielectric layers are estimated to be statistically significant. Additional improvement was made on removing the pores in the thick films, using the defoaming in pastes and cold isostatic pressing in bonding the top and bottom parts of the inorganic electroluminescent devices. Such optimization contributed to the reduction in the corresponding threshold voltage and enhancement in the brightness.

골다공증과 동반된 족관절 외과 골절의 지연나사를 이용한 치료

이준영,이광철,Lee, Jun-Young,Lee, Kwang-Chul 대한족부족관절학회 2006 대한족부족관절학회지 Vol.10 No.2

Purpose: To evaluate the results of ankle lateral malleolar fractures classified as Danis-Weber type B accompanying osteoporosis that were treated with lag screw. Materials and Methods: 15 cases of Danis-Weber type B ankle lateral malleolar fractures that had T score of less than -2.5 in BMD(bone mineral density) test were selected from June 2003 to December 2005. 10 cases were males and 5 cases were females with mean age of 59 years. The main injury mechanism was supination and external rotation. Mean follow-up period was 16 months. Clinical and radiologic evaluation was done according to Meyer and Kumler's criteria. Results: All cases showed satisfying result and mean radiologic bone union period was 3 months. Anatomic reduction and bone union was acquired in all cases without complications including wound infection, skin necrosis, delayed union and nonunion Conclusions: Lag screw fixation seem to be excellent treatment of Danis-Weber type B lateral malleolar fractures with osteoporosis as it can minimize soft tissue injury and enable anatomic reduction with firm fixation.

면 축약 방식을 이용한 체적 보존 메쉬 간략화

이준영,장태정,Lee, Jun-Young,Jang, Tae-Jeong 대한전자공학회 2005 電子工學會論文誌-CI (Computer and Information) Vol.42 No.5

본 논문에서는 면 축약 방식을 이용하면서 3D 모델의 체적이 보존되는 메쉬 간략화 알고리즘을 제안하였다. 면 축약은 축약 대상 삼각형의 세 정점을 새로운 정점 하나로 모아 한 번에 4개의 면을 제거함으로써 에지 축약에 비해 빠른 간략화를 수행하는 방식이다. 어떤 방식이든 어느 면 또는 에지부터 축약할 것인가 하는 간략화 우선순위 척도가 매우 중요한데, 본 논문에서는 면 축약에 있어서 최근 제시되었던 한 방법의 문제점을 지적하고 이를 보완한 새로운 가중치 함수를 사용하여 축약 우선순위를 결정하였다. 또한 축약 대상 삼각형들을 대신할 새로운 한 정점을 결정하는데 있어서 체적이 보존되면서 삼각형 세 정점 주변의 곡률 차이 등을 반영할 수 있는 체적 기준점을 결정하는 새로운 방법을 제시하였다. 시뮬레이션을 통하여 본 논문에서 제시한 방식이 체적을 보존하면서 기존의 다른 방식에 비해 뒤지지 않는 축약 성능을 보여주는 것을 확인하였다. In this paper, a mesh simplification algorithm using face constriction is proposed which considers the conservation of the volume of a 3D model. The face constriction method replaces three vertices of the candidate triangle with a new vertex, removing four faces at once. We propose a modified method, compensating an existing method, of considering curvature in the decision of the removing order of triangles. We also propose a method of determining a new vertex replacing the candidate triangle, which reflects curvature difference of the three surrounding areas of the three vertices of the triangle, while conserving the volume. It is shown by simulation that the proposed method conserves the volume and shows good constriction performance comparable to the other methods.

저전력 네트워크 기반의 확장 용이한 스마트 홈 IoT 시스템

이준영,유성은,Lee, Jun-young,Yoo, Seong-eun 대한임베디드공학회 2018 대한임베디드공학회논문지 Vol.13 No.3

There are increasing interests on smart home systems. However, most of the existing works focus on the functionality itself. In this paper, we propose an extensible smart home system based on low power networking such as CoAP, 6LoWPAN, and Zigbee. The proposed home IoT system consists of Home APP, Home Server, Home Broker, and Power Devices. Each component of the system is connected by the low-power network technologies aforementioned. As the end device, Power Device senses the current consumption of the attached appliance and controls the power to it. Power Device reports the sensing data to Home Server via Home Broker. The Home Broker enhances the scalability of the system. Home Broker extends the service area and the user's services, and it manages the connection of the underlying devices and processes, and transmits data to Home Server from Power Devices. Through the experimental evaluation, we show that the proposed system achieves the design goals such as extensibility and low power networking.

Cost Effective Fabrication of a Triboelectric Energy Harvester Using Soft Lithography

이준영,성태훈,여종석,Lee, Jun-Young,Sung, Tae-Hoon,Yeo, Jong-Souk The Korean Vacuum Society 2013 Applied Science and Convergence Technology Vol.22 No.4

에너지 수확은 우리주변에 존재하는 버려지는 에너지를 유용한 전기에너지로 변환하는 기술이다. 마찰전기 소자는 접촉을 통한 정전기를 유도하는 원리로 동력학적 에너지를 전기에너지로 전환하는 소자이다. 본 연구에서는 소프트 식각 기술을 활용하여 제작 단계를 최소화한 마찰전기 에너지 수확소자를 개발하고, 그 전기적 특성을 측정하였다. 마찰전기를 통한 발전은 마이크로패턴을 통해 마이크로 거칠기를 가진 알루미늄 층과 PDMS 층 사이에서 발생한다. 이때 PDMS 층의 마이크로 패턴은 마스크리스 식각을 통해 만들어진 알루미늄 층의 마이크로 패턴을 소프트 식각법으로 바로 본뜨는 방식으로 제작되었다. 본 소자는 2 V와 20 nA의 발전 성능을 나타낸다. Energy harvesting refers to converting ambient energy from our surroundings, which would be otherwise wasted, into useful electrical energy. A triboelectric energy harvester is a self-charged device for harnessing mechanical energy based on a coupled process of contact charging and electrostatic induction. In this research, we demonstrate simple fabrication of prototype triboelectric energy harvester using soft lithography and its electrical characterization. Triboelectric generation occurs between the two micro patterned layers of Au and PDMS. A micro pattern is simply replicated directly from the bottom layer to the top layer using soft-lithography without an extra transfer process. This generator can produce an output voltage of 2 V and output current of 20 nA.

가접부를 고려한 필릿 용접조건의 선정에 관한 연구

이준영,김재웅,김철희,Lee, Jun-Young,Kim, Jae-Woong,Kim, Cheol-Hee 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.5

In this study, an experimental method for the selection of optimal welding condition was proposed in the fillet weld which was done over the tack weld. This method used the response surface analysis in which the leg length and the reinforcement height were chosen as the quality variables of the weld bead profile. The overall desirability function, which was combined desirability function fur the two quality variables, was employed as the objective function for getting the optimal welding condition. In the experiments, the target values of the leg length and the reinforcement height are 6m and zero respectively for the horizontal fillet weld of 10mm thickness mild steel. The optimal welding conditions could predict the weld bead profile(leg length and reinforcement height) as 6.00mm and 0.19mm without tack weld and 6.00mm and 0.48mm with tack weld. from a series of welding test, it was revealed that a uniform weld bead can be obtained by adopting the optimal welding condition which was determined according to the method proposed.