Tabbing 공정 간소화를 위한 태양전지 전극 설계

전영우 청주대학교 대학원 2023 국내석사

현재 태양전지 시장의 90% 이상을 차지하는 결정질 실리콘 태양전지 모듈은 “Tabbing” 공정을 통하여 각 셀을 직렬 연결하여 상용 모듈에 적합한 전압을 형성하도록 하고 있다. 현재 가장 널리 사용되는 tabbing 공정 방식은 리본에 높은 온도의 열을 가하여 태양전지의 busbar에 접합시키는 방식이다. 고온으로 녹여 접합된 리본은 실리콘 웨이퍼와 열 팽창 계수가 다르기 때문에 모듈 가동 중 팽창과 수축을 반복하여 태양전지 셀에 스트레스를 유발하고 그로 인해 태양전지 모듈의 파손 증가 및 모듈에 휨이 발생한다. 본 연구에서는 tabbing 공정을 생략하고 전극이 내장된 EVA 시트를 사용하여 모듈의 라미네이션을 진행함과 동시에 전극을 형성하여 전체 공정을 줄이는 새로운 구조의 모듈에 적용될 태양전지 전극 구조를 설계하고 전극 구조의 변경에 따른 모둘의 특성 차이를 비교하였다. 그 결과 기존의 전극 구조를 변겅함에 따른 모듈의 특성 변화를 관측할 수 있었으며, 전극과 리본 간 저항에 따른 전면 전극 면적을 최적화 함에 따라 모듈의 특성 또한 최적화되는 것을 확인하였다. 또한 셀 간 연결이 저온 공정으로 진행되어 셀에 가해지는 스트레스가 줄어 태양전지 모듈의 파손율 감소에 기여할 수 있을 것으로 기대된다. Crystalline silicon solar modules, which currently account for 90% or more of the solar cell market, form a voltage suitable for commercial modules by connecting cells in series through a "Tabbing" process. Currently, the most widely used tabbing process is to apply heat at a high temperature to a ribbon and bond it to a busbar in a solar cell. A ribbon melted at high temperature has a different thermal expansion coefficient than a silicon wafer, so it expands and contracts while operating the module, causing stress in the solar cell cell, resulting in increased damage to the solar cell module and bending of the module. This paper designs a solar cell electrode structure for a module with a new structure to reduce the whole process by forming an electrode and laminating the module using EVA sheet with embedded electrodes, and compares the difference in characteristics according to the change of electrode structure. As a result, it was possible to observe a change in module characteristics due to the variation of the existing electrode structure, and also, it is verified that the module characteristics are optimized by optimizing the front electrode area due to the resistance between electrode and ribbon. In addition, it is expected that the connection between cells will proceed with the low temperature process, so that the stress applied to cells will be reduced, contributing to the reduction of the damage rate of solar cell modules.

제7차 · 7차 개정 교육과정에 따른 중학교 수학 교과서 비교 분석 : 중학교 1학년 수학 '문자와 식' 단원을 중심으로

전영우 아주대학교 교육대학원 2010 국내석사

네트워크 메타분석을 통한 학동기 어린이 근시진행 억제 중재도구의 효과

전영우 忠南大學校 大學院 2019 국내박사

This study aims to assess the effectiveness of various interventional tools to inhibit the progression of myopia in children of school age and to present their comparative precedence by the effectiveness. A systemic review was conducted to search and select literatures according to the predefined PICO format and the results were combined. The data of selected literatures were quantitatively compared, using network meta analysis. The main results of this study are as follows. For the effects of the interventional tools for inhibition of myopic progression on changes in refractive power, it is shown that high-dose atropine and medium-dose atropine inhibited the progression of myopia more effectively than placebo by 2.04D(95% CrI:0.39∼1.76) and 1.18D(95% CrI:0.0.87∼1.49), respectively. PALsH and PALsL were shown to inhibit the progression of myopia more effectively than SVLs by 0.57D(95% CI:0.06∼0.45) and 0.48D(95 % CrI:0.19∼0.39), respectively. For the effects of the interventional tools on changes in axial length, high-dose atropine suppressed the growth of the axial length by –0.40mm(95% CrI:-0.45∼-0.33) when compared to placebo, by –0.14mm(95% CrI:-0.22∼-0.06) when compared to low-dose atropine and by –0.27mm(CrI:-0.35∼-0.19) when compared to PALsL and medium-dose atropine suppressed the growth by –0.13mm(95% CrI:-0.21∼-0.05) when compared to low-dose atropine. Orthokeratology lens suppressed the growth of the axial length more effectively than SVLs by –0.27mm(95% CrI:-0.37∼-0.20) and BLsL and PALsL suppressed the length by –0.28mm(95% CrI:-0.38∼-0.01) and –0.25mm(95% CrI:0-0.17∼-0.15), respectively. The results showed that, for the changes in refractive power, high dose atropine was found to be the most effective interventional tool in inhibiting the progress of myopia among the various inhibitory intervention tools and BLsH to be the least. Even when compared for the changes in axial length growth, high-dose atropine was most likely to be the most effective interventional tool. In subgroup analysis, for the effects of interventional tools on changes in refractive powers by race, BLsL and PALsH were found to inhibit the progression of myopia more effectively in asian children than in white children, respectively by 0.55D and 0.31D. For the effects on changes in axial length by race, BLsL suppressed the growth in asian children and white children by –0.283mm and –0.088mm respectively, and PALsH suppressed the growth in asian children and white children by –0.266mm and –0.079, respectively, implying the stronger suppressive effects in asian children. Nevertheless, neither of the results in refractive power and axial length growth were found to be statistically significant. This study suggests that various interventional tools for inhibition of myopic progression can inhibit myopia progression more effectively than single vision spectacle lenses or placebo, among which atropine eye drops are the most effective in both refractive power change and axial length change. The results of this study imply the necessity to use the appropriate interventional tools to prevent progression to high myopia and to reduce the deterioration in eye sights due to myopia, thereby helping to reduce social and economic costs and improve the quality of life of the individuals. 목적 : 본 연구는 학동기 어린이의 근시 진행을 억제시키기 위한 다양한 중재도구의 효과와 이들의 비교 순위를 제시하고자 시도되었다. 방법 : 사전에 정의된 PICO형식에 따라 문헌을 검색하고 선택한 뒤 결과를 종합하는 체계적 문헌 고찰과, 선택된 문헌의 데이터를 양적으로 비교하는 네트워크 메타분석을 사용하였다. 결과 : 근시진행 억제 중재도구 별 굴절력 변화량의 효과에서는 고용량 아트로핀이 위약보다 2.04D(95 % CI:0.39∼1.76), 중용량 아트로핀은 위약보다 1.18D(95% CI:0.0.87∼1.49) 근시진행을 억제시키는 것으로 나타났다. 높은 누진가입도렌즈와 낮은 누진가입도렌즈는 단초점렌즈보다 각각 0.57D(95% CI:0.06∼0.45), 0.48D(95 % CI:0.19∼0.39) 근시 진행을 억제시키는 것으로 나타났다. 근시진행 억제 중재도구 별 안축길이 변화량의 효과에서는 고용량 아트로핀이 위약보다 -0.40mm(95%CI:-0.45∼-0.33), 저용량 아트로핀보다는 -0.14mm(95% CI:-0.22∼-0.06), 낮은 누진가입도렌즈보다 -0.27mm(CI:-0.35∼-0.19) 안축길이 성장을 억제시켰으며, 중용량 아트로핀은 저용량 아트로핀보다 -0.13mm(95% CI:-0.21∼-0.05) 안축길이 성장을 억제시키는 것으로 나타났다. 역기하렌즈(Orthokeratology lens)는 단초점렌즈보다 -0.27mm(95% CrI:-0.37∼-0.20) 안축길이 성장을 억제시켰으며. 낮은 가입도의 이중초점렌즈와 낮은 누진가입도렌즈는 각각 -0.28mm(95% CrI:-0.38∼-0.01), -0.25mm(95% CrI:0-0.17∼-0.15) 안축길이 성장을 억제시켰다. 근시진행 억제 효과에 대한 순위를 확인한 결과 굴절력 변화량을 기준으로 했을 때는 고용량 아트로핀이 가장 효과가 큰 것으로 나타났고, 높은 가입도의 이중초점렌즈가 가장 적은 것으로 나타났다. 안축길이 변화량을 기준으로 했을 때도 고용량 아트로핀이 선택 될 가능성이 높은 것으로 나타났다. 하위군 분석으로 인종 별 중재도구의 굴절력 변화량에서 낮은 가입도 이중초점렌즈와 높은 누진가입도렌즈의 효과는 백인 어린이에 비해 아시아계 어린이에서 각각 0.55D, 0.31D정도 근시진행을 억제시켰다. 중재도구의 안축길이 변화량의 인종 간 효과차이는 낮은 가입도 이중초점렌즈에서 동양계 어린이는 -0.283mm, 백인 어린이는 –0.088mm이었으며. 높은 누진가입도렌즈의 효과는 동양계 어린이와 백인 어린이에서 각각 -0.266mm와 -0.079mm로 백인 어린이보다 동양계 어린이에서 좀 더 근시진행을 억제시켰으나 굴절력 및 안축길이 변화량 모두 통계적으로 유의하지 않았다. 결론 : 본 연구를 통해 근시진행 억제를 위한 다양한 중재도구들은 단초점렌즈 또는 위약과 비교할 때 보다 효과적으로 근시진행을 억제시킬 수 있음을 시사하며, 그 중 아트로핀 점안제가 굴절력 변화량 및 안축길이 변화량 모두에서 가장 효과적인 근시진행 억제 중재도구 임을 알 수 있었다. 이를 증거기반으로 적절한 근시 진행 억제 중재도구를 사용하여 고도근시로의 진행을 막고 근시로 인한 시력저하를 줄여 사회․경제적 비용절감 및 개인의 삶의 질을 높이는 데 도움이 되도록 해야 할 것이다.

The efficacy of frontline autologous stem cell tranplantation in aggressive lymphoma

전영우 순천향대학교 대학원 2015 국내석사

Introduction: The high-dose chemotherapy and autologous stem cell transplantation (HDT & ASCT) is one of the treatment option for patients with relapsed aggressive non-Hodgkin’s lymphoma (NHL), and the role of HDT & ASCT has been proven in chemosensitive-relapsed DLBCL1). However, the role of HDT & ASCT as frontline therapy in the high risk aggressive NHL patients is still a matter of debate and is not well recognized, Therefore, we retrospectively analyzed the clinical outcomes to compare conventional chemotherapy and HDT & ASCT in aggressive NHL. Materials and methods: This study retrospectively reviewed the medical records of 367 patients who were diagnosed with aggressive non-Hodgkin’s lymphoma at the Soonchunhyang University Hospital between January 2002 and December 2012. According to eligible criteria, patients were selected in conventional chemotherapy and HDT & ASCT group. the primary-end was progression free survival (PFS) and secondary-end point was overall survival (OS). Results: All of 54 patients were enrolled and categorized to two groups as the conventional chemotherapy group (n=40, 74%) and the HDT & ASCT group (n=14, 26%). With median follow-up of 60 months, the 7-year PFS rate was 64.1 % in the chemotherapy group and 22.9 % in the HDT & ASCT group (p=0.868). the 7-year OS was 76.9 % in the chemotherapy group and 81.8 % in the HDT & ASCT group (p=0.584). There were no significant differences between the two treatment methods in PFS and OS. Subgroup analyses of PFS and OS according to the histology was conducted. In DLBCL, the 7-year PFS were 81% in the chemotherapy group and 50% in the HDT & ASCT group (p=0.211) and the 7-year OS were 84.6% and 50% (p=0.327), respectively. In T-cell lymphoma, the 7-year PFS were 56% and 67% (p=0.571) with all patients still alive to date, and the 7-year OS were 72.4% and 80% (p=0.744). Conclusion: the HDT & ASCT do not improve the outcome in patients with aggressive NHL including of DLBCL that responds to first line chemotherapy. However there were no statistical significance, the data showed the tendency that there is a tendency that R-CHOP chemotherapy has better outcomes in DLBCL and HDT & SCT has better outcomes in T-cell lymphoma in our cohorts.

6세기 중반 백제와 신라의 관계 변화 양상

전영우 충북대학교 2021 국내석사

This dissertation focuses on Baekje’s strategy towards Silla and the variability of international relationships in the mid 6th century, and examines changing aspects of the relationship between the two nations during this period. Their struggles over the Han river basin were the mirror of this situation. Previous studies argue that Silla secretly developed a partnership with Goguryeo to attack the lower Han river area of Baekje, or Baekje willingly renounced the area when it realized their relationship, and at the time revengeful Baekje attacked the Gwansanseong Fortress of Silla, their long lasting partnership fell to an irretrievable breakdown. These arguments lack a rational explanation of major events following Baekje’s loss of the Han River basin. One argues that Baekje abandoned it focussing instead on their southern border toward Gaya, which overlooks the purpose of the cooperative relationship between Baekje and Silla - to respond to Goguryeo and to advance into the northern area. This paper propose a better interpretation of the major events of the 550s CE in the light of the interests of Baekje and Silla and the changeable international relations at that time. In the 6th century, Baekje and Silla were eager to occupy the Gaya region but were under the constant threat of Goguryeo. Baekje would have had to adapt a flexible international strategy to resolve the problem. When the level of threat increased, Baekje made a compromise with Silla to build Guryemoraseong Fortress together in Taksun. At the same time, when the threat decreased, Baekje made a solo move to advance to Ara Gaya and built Geoltakseong Fortress. In the 540s, Baekje switched its position against Goguryeo from defense to offense, taking advantage of a chaotic moment in Goguryeo. In the process, Baekje is believed to have attempted to draw in Silla to respond against Goguryeo, as well as to suppress Silla’s advance into the Gaya region. A record describing the death of King Seong of Baekje mentions the pledge between Baekje and Silla. The international relations at the time were entirely based on a realistic understanding and practical interest. So-called pledge, pacts, envoy exchanges, and peace treaties were nothing but a temporary means to an end. The establishment and destruction of partnerships were frequent and secret collaboration between countries were common. Baekje and Silla shared a communal interest to advance to the north, as seen not only in the events of 550 in Dosalseong Fortress and Geumhyeonseong Fortress, but also in the advance to the Han River basin in 551. At the same time, they sought a way to maximize their own profits, and sometimes suffered a loss to some degree. Nevertheless, they maintained this association and averted direct conflicts. It is thought that they superficially maintained a friendly relationship unless one’s action exercised great influence on the other’s strategy. Previous studies consider events recorded in the Nihon Shoki in 552 and in the Samguk Sagi in July 553 as the same event. Based on the record of the Nihon Shoki saying Silla occupied Hanseong, they claim that Silla captured Hanseong and Nampyeongyang in company with Goguryeo and split the regions under mutual consent. However, it seems that the two sources comment on separate events from different times. The Samguk Sagi records that Silla established Sinju at the northeast border of Baekje. The Nihon Shoki describes two events together, Baekje’s loss of the Han river basin and Silla’s occupation of Hanseong, in the year of 552. It was 555 when King Jinheung came to inspect the Bukhansan Mountain area, his new territory. In 557, Silla installed Bukhansanju in Nampyeongyang area and it was also referred to as Hanseong. Therefore, these two documents should be dealt with in a separate context and they are hardly evidence for Silla and Goguryeo’s sharing the regions by mutual consent.  Baekje's loss of the Han River basin is thought to result from its failure of establishing a ruling system in the region inwardly, and outwardly the pressure of Silla’s movement toward Gaya. In particular, Baekje’s assertion made in May 552 about the partnership between Silla and Goguryeo is believed to indicate Baekje’s consistent strategy to resolve Goguryeo and Gaya issues at once. Baekje would have had to mentioned Goguryeo since its power was alive and well. Baekje’s statement would be believed to be part of a diplomatic battle between the three countries. It also demonstrates heated competition over the Han River region. Baekje’s other claim on collusion between Goguryeo and Silla, made in July 553 after Silla’s installation of Sinju, presumably reflects Silla’s contact with Goguryeo during the advance to the Han river basin area. The relationship between Baekje and Silla broke down, which put Baekje into diplomatic isolation. However, in October 553, Baekje unexpectedly attacked Baekhabya in Goguryeo, while forging a relationship with Silla through marriage. Considering the Baekje-Silla cooperative relationship from 548 to 551 against Goguryeo, it is fair to guess Baekje and Silla allied again for their interests and fostered a marriage relationship to cement it, which enabled Baekje to attack Goguryeo, and Silla to advance into the Hamgyeong-do area. The Gwansanseong battle in 554 is normally thought to have been instigated by Baekje. The Samguk Yusa records that Baekje invaded Silla’s Jinseong in September 554. However, the Jinseong area was originally Baekje’s territory called Jindonghyeon and was taken by Silla. In addition, the Gudangseo notes a remark of Silla’s envoy mentioning that Silla made a preemptive attack on Baekje. So the Gwansanseong battle was literally Baekje’s counterattack on Silla. Gaya probably participated in this battle since Silla attacked Jinseong Fortress near Geumsan which was part of the inland traffic route between Baekje and Gaya. In the early stage of the Gwansanseong battle, Baekje had the upper hand against Silla, attacking Jinseong and constructing Gutamorasae Fortress led by Prince Yeochang. The battle saw a turning point when Goguryeo, in partnership with Silla, launched an attack on Ungcheonseong Fortress of Baekje, which dispersed Baekje‘s military power. The battle came to a standstill but made progress when Dongbangryeong took Hamsanseong Fortress under King Seong's order. King Seong entered the Gwansanseong region, but on the way to join Prince Yeochang in Gutamorasae he met his death in Gucheon, which caused Baekje to defeat the battle. The alliance of Baekje and Silla was no more than a means to obtain their interests and alternately forged and broken under this principle in the mid 6th century. Saving that the opponent’s action was significantly against their interests, they superficially maintained their partnership, even if relational solidarity was weakened. But the change in interests immediately brought about a change in the relationship. Goguryeo and Gaya also intervened in this relationship for their own interests. The volatile partnership of Baekje and Silla in the 550s finally reached a complete breakdown with the Gwansanseong battle, and this continued until the collapse of Baekje in 660.

海上保險契約上 堪航能力注意義務에 관한 硏究

전영우 韓國海洋大學校 1997 국내박사

시멘트, 팽창재와 플라이애쉬를 이용한 지반 보강 공법 개발

전영우 명지대학교 대학원 2012 국내석사

그라우트재로 지반 보강에 많이 사용되는 시멘트는 건조 후 수축에 의한 체적 감소가 문제되고 있다. 압력식 소일네일링의 경우 위의 문제점을 극복하고자 압력 주입으로 강도와 마찰저항을 증가시켰다. 그러나 압력주입을 위한 추가적 장비가 필요하여 경제적 현장 운영이 어렵다는 단점이 있다. 압력분사 시멘트 그라우팅 기법 적용 시 중력식 시멘트 그라우팅 기법에 비하여 가압으로 인한 천공공의 확장과 주변지반으로 침투된 시멘트 밀크로 인한 유효경이 증가되며 이로 인하여 네일 주변 흙의 마찰력이 향상되는 것으로 보고되고 있지만 가압에 의한 확장량과 밀크의 주입에 의한 확장량이 명확히 구분되지 못하고 있다. 그리하여 쏘일네일링공법 설계시 대부분 경험에 의존하여 정형화된 천공공의 직경 및 압력을 사용하고 있어 지반 상태 및 조건에 따른 천공경의 직경과 압력이 유동성 있게 적용되지 못하고 있어 효율적인 현장 운영이 어렵다는 문제점이 야기되고 있다. 이 연구는 팽창재를 이용하여 효과적으로 그라우트체의 팽창을 유도하여 압력식 쏘일네일링공법의 단점을 극복하고 새로운 공법개발의 기초 자료를 마련하는데 그 목적이 있다. 이를 위해 암석 파쇄용 팽창재를 사용하여 기초연구를 진행하였으며 팽창효과로 인한 강도증가, 팽창압력으로 인한 마찰저항 증가, 팽창시간과 변형률을 측정하여 팽창압력을 고찰하였다. 이를 위해 일축압축강도시험과 마찰저항측정실험, 팽창압력측정실험을 실시하여 그 결과를 비교 분석하였다. 또한, 시멘트 대체 물질이라 주목받고 있는 플라이애쉬(영흥화력발전소)를 이용하여 위와 동일한 조건으로 그 결과를 비교 분석하여 시멘트 사용량 감소와 재활용품 적용을 통한 친환경공법 개발이라는 목적도 동시에 달성하고자 하였다. 연구결과 팽창재의 사용으로 강도증진, 마찰저항증가, 팽창압력(0.6∼1.7MPa)이 발생하는 것을 알 수 있었다. 플라이애쉬의 경우 충분한 양생일을 두어 강도가 어느 정도 회복되는지를 판단하기 어려웠지만 팽창재와 함께 사용하는 경우 마찰저항, 팽창압력이 시멘트만을 사용한 경우보다 증가하여 시멘트의 대체물질로써의 가능성을 확인 할 수 있었다. The biggest disadvantage of using cement grouting is shrinkage, For this reason, it has been started using pressure on grouting for the ground improvement method especially soil nailing. Applying pressure occurred big financial problem because of using heavy gear. Pressuring on grouting is able to increase skin friction and develop the effective diameter considerably. It is not clear that increment of skin friction and development of effective diameter due to only pressuring or amount of injecting cement mix. For this reason, to inject cement mix with pressure only depend on personal experiences. Purpose of this study it to find out new method for using cement mix with expansion agent and fly ash. The expansion agent is used in breaking rocks in general. and fly ash is supported by Yeongheung Thermal Power Site Division. Laboratory experiments were performed with using these materials and were conducted by three methods. Compressive strength test, friction measurement experiment and swelling pressure measurement experiment were carried out in this study. Expansion agent can increase compressive strength, friction and swelling pressure(0.6∼1.7MPa). Fly ash was able to increase skin friction and swelling pressure. It might be possible that fly ash can be used instead of cement in a small amount. This study has to be continued to develop new method using expansion agent and fly ash. It might be a chance to develop new method of ground improvement using expansion agent and fly ash mixed with cement.

자기조절을 위한 인지적 노력이 외현기억과 암묵기억 수행에 미치는 영향

전영우 忠南大學校 大學院 2015 국내석사

This research has the purpose to verify how the cognitive effort of self-regulation affects explicit and implicit memory. Moreover, the influence of self-regulation depends on whether explicit and implicit memory, which means the lower type of a long-term memory. 42 students of C University participated in this experiment. Also, they were assigned into 2 groups; one for an explicit group and the other for implicit one with a cognitive load adjusted by utilizing a response inhibition task and digit task. The results support results from previous researches, a limited resource of self-regulation. When subjects in an inhibition task perform another memory task, the level of their performance is lower than those in an digit task because some of their capacity for self-regulation is depleted during the inhibition task. Also, Both types of memory showed difference depending on each task setting. Although previous research supports that self-regulation doesn’t affect an implicit memory because an implicit memory doesn’t depend on conscious recall, the result of this experiment means that self-regulation can have an effect on both explicit and implicit memory. This research has a meaningful significance since it is comprehensively tested whether self-regulation affects each memory group with explicit and implicit memory group separated. 본 연구는 자기조절(self-regulation)의 인지적 노력이 외현기억(explicit memory) 및 암묵기억(implicit memory)에 미치는 효과를 살펴보고 나아가 자기조절(self-regulation)의 영향력이 장기기억의 하위유형, 즉 외현기억과 암묵기억에 의존적인지 검증(test)하고자 하였다. 구체적으로, 본 실험에서는 C대학에 재학 중인 대학생 42명이 실험에 참여하였으며, 이를 위해 외현(explicit) 및 암묵기억(implicit memory) 집단을 구분하고 반응 억제 과제와 수식 계산 과제를 이용하여 인지적 부하(cognitive load)를 조절하였다. 그 결과, 자기조절이 제한된 자원을 가지고 있다는 선행연구를 지지하였으며, 세부적으로 외현기억과 암묵기억 모두 조절과제 조건에 따라 차이가 나타났다. 암묵기억은 의식적인 회상에 의존하지 않고, 암묵기억과제 자체가 정교한 부호화의 변화에 덜 민감하므로 자기조절력에 영향을 주지 않을 것이라는 이전의 선행연구들과 다르게 나타났으며, 자기조절이 외현기억 뿐만 아니라 암묵기억에도 영향을 미친다는 것을 의미한다. 본 연구는 장기기억의 분리된 체계인 외현기억과 암묵기적의 집단을 분리하고 자기조절이 구분된 각각의 기억체계에 영향을 미치는지를 통합적으로 검증했다는 것에 의의가 있다.

Enhancement of Graft Versus Host Disease Control Efficacy by Adoptive Transfer of Type 1 Regulatory T Cells in Bone Marrow Transplant Model

전영우 가톨릭대학교 대학원 2019 국내박사

IT기반의 터널시공에 따른 주변 건물/매설관 손상평가 시스템 개발

전영우 成均館大學校 大學院 2003 국내석사