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조윤진(Cho Youn-Jin),이동훈(Lee Dong-Hoon) 한국방송·미디어공학회 2007 한국방송공학회 학술발표대회 논문집 Vol.2007 No.-
최근에 제안되고 있는 원격 서버에 로그인하기 위한 방법은 ID와 패스워드뿐만 아니라 스마트카드를 함께 사용한다. 기존의 ID와 패스워드를 사용한 인증은 공격자에 의해 추측이 가능하므로 사용자 가장 공격이 가능하다는 약점을 가지고 있다. 하지만 스마트카드와 ID, 패스워드를 사용하면 ID와 패스워드가 추측가능할지라도 스마트카드를 소지하고 있지 않다면 사용자 가장 공격 (impersonate attack)을 할 수 없다. 이 논문에서는 스마트카드와 ID, 패스워드를 함께 사용하여 원격 서버에 인증과 더불어 안전한 키 교환을 하며, 기존에 다른 논문들에서 언급한 조건들을 모두 만족하면서 안전한 키 교환까지 제안하였다. 기존의 스킴은 해쉬 기반으로 제안 되었으나 이 논문에서 제안한 스킴은 페어링 (pairing) 연산을 기반으로 제안 되었다. 또한, Computational Diffie-Hellman 문제를 기반으로 스킴을 제안하여 안전성에 대한 증명이 가능하다. 최근에 스마트카드를 사용한 인증에서 요구 되는 성질의 모든 조건을 만족한다는 장점을 가지고 있다.
각형강관을 이용한 슬림플로어 시스템의 층고절감효과 비교
조윤진 ( Cho Youn-jin ),임홍철 ( Rhim Hong-chul ),김대유 ( Kim Dae-you ),류승일 ( Yu Seung-il ),김도균 ( Kim Do-kyun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
In recent years, new construction methods have been required to reduce the construction cost and increase the available area in an environment where construction work is frequently performed in a narrow urban area like Korea. As a result of these studies, slim floor composite beam has been suggested. Slim floor composite beam can reduce required depth because web of steel beam is embedded in the slab, so it is effective to reduce floor height and increase the available area. The purpose of this study is the floor height reduction evaluation by comparing system consisting of reinforced concrete, steel, and slim floor using square-shape steel pipe. After doing structural design for a typical plan, checked effectiveness by comparing each design plan. It is proven that slim floor composite beam can reduce required depth effectively comparing required materials of other system.
이하선에 발생한 혼합 아형의 암종들로 구성된 다형선종 유래 암종 1예
조윤진(Youn Jin Cho),조영록(Young Rok Jo),이상엽(Sang-Yeop Lee),이혜란(Hye Ran Lee) 대한두경부종양학회 2024 대한두경부 종양학회지 Vol.40 No.1
Carcinoma ex pleomorphic adenoma is an uncommon malignant salivary gland tumor that arises from a longstanding pleomorphic adenoma. The carcinomatous component of carcinoma ex pleomorphic adenoma can possess virtually any histologic subtype of salivary gland cancer. We experienced a case of a 61-year-old patient who presented with a right parotid mass that was initially palpated 20 years ago, with a sudden increase in size in the last few months. Radiological and cytological findings from fine needle aspiration biopsy could not exclude malignancy. Total parotidectomy and selective neck dissection were performed for treatment, and carcinoma ex pleomorphic adenoma with mixed carcinoma components of salivary duct carcinoma and myoepithelial carcinoma was diagnosed. After receiving postoperative radiation of 6000 cGy over 6 weeks, there has been no recurrence up to the 18-month follow-up. We report this rare case of carcinoma ex pleomorphic adenoma with mixed malignancy subtypes, accompanied by a review of literature.
구조물 건전도 평가를 위한 모르타르 내 공극 초음파 탐상
조윤진 ( Youn Jin Cho ),임홍철 ( Hong Chul Rhim ),김대유 ( Dae You Kim ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1
Structural integrity of reinforced concrete structures including nuclear power plants needs to be evaluated on a regular basis. Deterioration inside the concrete structures can be represented by voids. In this study, the varied volume fraction of voids inside mortar specimens was studied as a parameter using ultrasonic testing equipments. Both direct and indirect measurement methods were employed. The results show that there is a clear distinction between the specimens with different void volume fractions.
3D 동작분석법을 이용한 골프 베이스 레이어 패턴개발 연구
조윤진(Cho Youn-Jin),김경희(Kim Kyung-Hee) 한복문화학회 2020 韓服文化 Vol.23 No.1
The golf is gradually popularized as an exercise that could be enjoyed by everyone regardless of age, sex, and build, and the golf wear market is continuously growing in the annual average for 10% or more. Thus, this study targeted middle-aged men in their 40s-50s, showing the most active demand for golf. Also, out of people with golf experience for ten years or more, this study selected five people falling under the error range of standard figure in 40s-50s. After selecting a person who was the closest to the standard figure out of those five subjects, this study conducted 3D scanning with a type of STD and five types of golf swing motions, and then calculated changes in body surface for each motion through the process of flattening. This study suggested the final base layer pattern by comparing the brainwave analysis on the second experimental wear and four types of comparison wears after modifying/complementing the pattern through the evaluation of motion suitability for the first experimental wear and four types of comparison wears. As the selection of those five subjects was based on the standard figure in accordance with the 7th Human Body Size Survey Report by the Korean Agency for Technology and Standards, it would be needed to be careful to apply it to every figure. If the follow-up researches multilaterally analyze the figures in 40s-50s, the methods to design the base layer pattern for each figure could be suggested.
김대유 ( Kim Dae-you ),임홍철 ( Rhim Hong-chul ),조윤진 ( Cho Youn-jin ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
In order to examine the effect of voids on the ultrasonic wave velocity, specimens made of Silica-Sand with voids were prepared for the measurements. The volume fraction of 0, 15, and 30% of voids were used to compare the differences. Because of its more homogeneous distribution of materials properties, the Silica-Sand specimens were used, as compared to mortar specimens. The results showed clear change in ultrasonic wave velocity with different volume fraction of voids. This result is to be used for the estimation of the integrity of concrete structures using ultrasonic wave velocity method as nondestructive testing.
이건혁(Gun Hyuk Lee),송지선(Ji-Sun Song),윤소연(So Yeon Yoon),조윤진(Youn Jin Cho),홍현준(Hyun Jun Hong) 대한두경부종양학회 2020 대한두경부 종양학회지 Vol.36 No.2
Neck mass has various etiologies, including inflammatory, congenital, neoplastic causes. The IgG4-related disease can cause symptoms in the head and neck areas with an inflammatory neck mass. It also shows clinical and pathological findings from inflammation caused by immune reactions, such as lymphocyte and plasma cell infiltration, storiform fibrosis, obliteration phlebitis, and invigorated serum IgG4 levels. The treatment guideline has not been established and still under debate, but systemic glucocorticoid seems to be effective in the most cases. In this brief report, a 48-year-old male patient presented with voice change for 3 weeks. Left side paramedian vocal fold palsy was observed in the flexible laryngoscopy. About 2.5X2.0X1.2cm size, heterogeneously enhanced neck mass with irregular margin encasing left carotid artery was noted on preoperative contrast enhanced neck CT scan, and it was suspicious of left carotid body tumor. The pathology shows IgG4-related disease rather than carotid body tumors. We report this case of IgG4-related disease, which can be misdiagnosed to carotid body tumors.
김대유 ( Dae You Kim ),임홍철 ( Hong Chul Rhim ),조윤진 ( Youn Jin Cho ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1
Cracks are inherent to concrete by its nature. The various size and shape of cracks induce deterioration of reinforced concrete structures including nuclear power plants. The wider and deeper the crack is, the concrete structures are more vulnerable to carbonization. Thus, it is essential to develop a reliable measurement technique of cracks inside concrete. In this study, an ultrasonic test method is applied to the crack measurements. The results can be used for evaluation of existing reinforced concrete structures.
김대유 ( Kim Dae-you ),임홍철 ( Rhim Hong-chul ),조윤진 ( Cho Youn-jin ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2
The various size and shape of cracks in concrete induce deterioration of reinforced concrete structures including nuclear power plants. The wider and deeper the crack is, the concrete structures are more vulnerable to carbonization. Thus, it is essential to develop a reliable measurement technique of cracks inside concrete. In this study, an ultrasonic test method is applied to the crack measurements. The results can be used for evaluation of existing reinforced concrete structures.