RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      • 좁혀본 항목

      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
          • 원문제공처
          • 등재정보
          • 학술지명
          • 주제분류
          • 발행연도
          • 작성언어
          • 저자

        오늘 본 자료

        • 오늘 본 자료가 없습니다.
        더보기
        • 무료
        • 기관 내 무료
        • 유료
        • KCI등재

          피스톤 크라운용 단강에 인코넬 718 용접재료로 용접된 용접부의 특성 평가

          이성열(Sung-Yul Lee),문경만(Kyung-Man Moon),정재현(Jae-Hyun Jeong),이명훈(Myeong-Hoon Lee),백태실(Tae-Sil Baek) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.4

          The combustion chamber of a diesel engine is often exposed to a more serious wear and corrosion environment than other parts of the engine because its temperature increases as a result of using heavy oil of low quality. Therefore, repair and built-up welding methods must be performed on worn or corroded parts of the piston crown, exhaust valve, etc. from an economical point of view. In this study, Inconel 718 filler metal was used in repair welding on the groove of a forged steel specimen for a piston crown, along with built-up welding on the surface of another forged steel specimen. Then, the corrosion characteristics of the weld metal zone for the repair welding and the deposited metal zone for the built-up welding were investigated using electrochemical methods in a 35% H2SO4 solution. The deposited metal zone indicated better corrosion resistance than the weld metal zone, showing a nobler corrosion potential, higher impedance, and smaller corrosion current density. It is considered that metal elements with good corrosion resistance were generally included in the filler metal, and these elements were also greatly involved in the deposited meta by built-up welding, whereas the weld metal consisted of metal elements mixed with both the filler metal and base metal elements because of the molten pool produced by the repair welding. Finally, it is considered that the hardness of the weld metal was increased by the repair welding, whereas the built-up welding improved the corrosion resistance of the deposited metal.

        • KCI등재

          개량형 C95600 청동의 기계적 성질과 미세조직에 미치는 퀜칭 열처리의 영향

          이성열(Sung-Yul Lee),문경만(Kyung-Man Moon),오재환(Jae-Hwan Oh),신동일(Dong-Il Shin) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6

          Modified C95600 bronze contains Fe component if 0.7 weight percentage besides Cu-7Al-2.5Si composition. The shape of centrifugal cast is a circular pipe with thick wall. Specimens machined from the centrifugal cast were quenched in oil after isothermal holding at a given heat treatment temperature in the range of 700-900 ℃. Mechanical properties and structural morphology are depended on the quenching heat treatment temperature regardless of isothermal holding time. Tensile strength or Brinell hardness is increased with increasing heat treatment temperature. The microstructure caused by quenching contains mixing phases of α+β’+ FeSi+κ, which martensite if β’ phase has been transformed from β phase. Effect of isothermal holding temperature on mechanical properties in case of quenching heat treatment attributes to the change if volume fraction if β" on the structural morphology. Mechanical characteristics of specimen, initially quenched fram 850 ℃, and then tempered at 500 ℃, does not show an obvious softerning indication, because disappearance of β’ during tempering process can be compensated by precipitation of brittle phase ?.

        • Permanent makeup removal from murine skin using a 1,064 nm Q-switched Nd:YAG laser: comparison of the degree of removal when irradiated at various time points after application

          이성열 ( Sung Yul Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2

          Backgroud: Various Q-switched(QS) lasers, such as ruby, alexandrite or neodymium:YAG(Nd:YAG) lasers, are used to remove tattoos and permanent makeup. To our knowledge, there has been no indication or guideline published for the optimal time for laser-mediated tattoo removal. Objective: To set a guideline for the optimal irradiation time for tattoo and permanent makeup removal via 1,064nm QS Nd:YAG(QSND) laser, we compared the degree of tattoo removal and skin histologic changes when the irradiation was employed at different time points. Mothods: Rat skin was marked with 54 artificial permanent makeup marks with black ink using a permanent makeup machine. The marks were irradiated with a 1,064 nm QSND laser on the application day, and 3 days, 5 days, 1 week, 2 week, and 3 weeks after application. Pigmentation changes were checked over time using a Mexameter and skin biopsy. Results: There was no significant difference in the degree of pigment removal as examined by Mexameter on the day of makeup application compared to 3 days, 5 days, 1 week, 2 weeks, and 3 weeks after application. Histologically, the permanent makeup pigments seemed to move from epidermis to superficial and mid dermis with time. The pigments were relatively well removed throughout the epidermis and dermis when the laser was employed 7 days after tattoo application, compared to laser irradiation on the day of application, as viewed histologically. Conclusion: Laser removal of permanent makeup is effective on the day of application, as determined by testing pigment levels. However, based on histopathology, it is recommended to use lasers to remove permanent makeup about a week after application, since the wound repair process is almost complete at that time.

        • KCI등재

          선박 해수배관에서 용접봉의 종류에 따라 직류 아크 용접한 용접부위의 부식특성에 관한 전기화학적 평가

          이성열(Sung-Yul Lee),이규환(Kyu-Hwan Lee),원창욱(Chang-uk Won),나승수(Shane Na),윤영곤(Young-Gon Yoon),김윤해(Yun-Hae Kim),이명훈(Myeong-Hoon Lee),문경만(Kyung-Man Moon),김진경(Jin-Gyeong Kim) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.3

          The seawater pipes in the engine rooms of ships are surrounded by severely corrosive environments caused by fast flowing seawater containing chloride ions, high conductivity, etc. Therefore, it has been reported that seawater leakage often occurs at a seawater pipe because of local corrosion. In addition, the leakage area is usually welded using shielded metal arc welding with various electrodes. In this study, when seawater pipes were welded with four types of electrodes(E4311, E4301, E4313, and E4316), the difference between the corrosion resistance values in their welding zones was investigated using an electrochemical method. Although the corrosion potential of a weld metal zone welded with the E4316 electrode showed the lowest value compared to the other electrodes, its corrosion resistance exhibited the best value compared to the other electrodes. In addition, a heat affected zone welded with the E4316 electrode also appeared to have the best corrosion resistance among the electrodes. Furthermore, the corrosion resistance of the weld metal zone and heat affected zone exhibited relatively better properties than that of the base metal zone in all of the cases welded with the four types of electrodes. Furthermore, the hardness values of all the weld metal zones were higher than the base metal zone.

        • KCI등재

          복싱 잽(jab) 동작 시 상지회전 운동이 근활성도에 미치는 영향

          이성열 ( Lee Sung-yul ),권문석 ( Kwon Moon-seok ),조효구 ( Cho Hyo-gu ),김진표 ( Kim Jin-pyo ) 대한무도학회 2017 대한무도학회지 Vol.19 No.2

          본 연구는 복싱 잽(jab) 동작 시 상지회전 운동에 따른 근활성도를 분석하는데 목적이 있었다. 최근 1년간 근골격계 상해을 경험하지 않은 대학교 남자 복싱선수 7명이(나이: 21.44±0.53 yrs, 신장: 171.22±4.32 cm 체중: 66.00±8.43 kg, 경력 7.22±0.67 yrs) 3가지 Type으로(Type 1: 손등이 위쪽, Type2: 손등이 좌측방향, Type 3: 손등이 우측방향) 잽 동작을 수행하는데 발생되는 상지 근육들의 활성도를 측정하였다. Noraxon wireless system을 이용하여 인체 근육의 활성도 자료를 수집하였으며 상지회전 운동에 따른 잽의 3가지 Type에 따른 차이를 검증하기 위해 one-way repeated ANOVA(α=.05)에서 실시하여 다음과 같은 결과를 도출하였다. 복싱 잽 동작 시 상지 근육들의 근활성도 및 최대 손 속도 그리고 Type 1에 대하여 일반화한 수치를 분석한 결과, Type 3 조건에서 통계적으로 가장 큰 수치를 나타내었다. 그러므로 복싱 잽 동작 시 상지의 회내 회전 운동은 펀치력을 상승시킬 수 있을 것으로 사료된다. The purpose of this study was to analyze the effect of upper extremity rotation movement on muscles activation of upper and forearm during the boxing jab. Eight elite boxing player(age = 21.44±0.53 yrs, mass = 66.00±8.43 kg, height = 171.22±4.32 cm, career = 7.22±0.67 yrs) were performed three type of jab(Type 1: the back of the hand toward ground, Type 2: the back of the hand toward right, Type 3: the back of the hand toward left) on muscles activation of upper and forearm. All muscles activation data was collected using Noraxon wireless system. The value of mean IEMG, %RVC and velocity of hand were compared among the three type of jab by using the one way repeated ANOVA(a=.05). The results indicated that mean IEMG, velocity of hand and normalized value by Type 1 were significantly higher in the Type 3 condition. Therefore, it was known that upper extremity internal rotation may increase power of punch for attacking game during a boxing jab.

        • SCOPUSKCI등재

          ab initio Calculations on Alkali Atom - Rare Gas Van Der Waals Clusters

          이보순,이성열,Lee, Bo Soon,Lee, Sung Yul Korean Chemical Society 2000 대한화학회지 Vol.44 No.3

          M-Rg 및 M-Rg2 (M=Li,Na,Rg=He,Ar) 반데르발스 복합체들에 대한양자화학적계산을 시행하였다. AIl-electron MP2(6-311++G(3df,3pd))에 의하여 계산된 LiHe, LiAr 및 NaAr의 균형 핵간 거리와 결합 에너지는 실험값과 잘 일치하였다. $LiHe_2,\;LiAr_2$ 및 $NaAr_2$에 대하여 계산된 분광학적 성질들도 또한 계산하였다. ab initio calculations are presented for M-Rg and M-Rg2 (M=Li, Na, Rg=He, Ar) van der Waals clusters.InternucIear distances and binding energies of LiHe, LiAr and NaAr obtained by all-electron MP2(6-311++G(3df,3pd)) method are in good agreement with experimental values. Calculated properties of LiHe$_2$, LiAr$_2$, NaHe$_2$ and NaAr$_2$ are also reported.

        • KCI등재

          원저 : 충청남도 지역 알레르기접촉피부염 환자(2007∼2011년)의 첩포검사(TRUE Test) 결과에 대한 고찰

          오상진 ( Sang Jin Oh ),이종석 ( Jong Suk Lee ),이성열 ( Sung Yul Lee ) 대한피부과학회 2013 大韓皮膚科學會誌 Vol.51 No.9

          Background: A number of skin manifestations in patients with allergic contact dermatitis result from sensitization with specific allergens, and patch testing is used as a diagnostic means of identifying theses allergens. In Korea, the commercial patch test panel, the TRUE-test, has been available since 2005. However, there have been few reports regarding the results of the TRUE-test. Objective: The purpose of this study was to analyze the type, frequency, and changes in common contact allergens in Korea using the TRUE test. Methods: A total of 311 patients with allergic contact dermatitis were evaluated by the TRUE test between January 2007 and December 2011 at Soonchunhyang hospital. Patch test reading was performed on day 2 and day 4. Results: A total of 311 cases of TRUE test records (male 79, female 232) were compiled and analyzed. The highest age distribution was the 4th decade in females. The face, with exception of the lips, was the most frequently affected site (40.2%). Overall, 58.8% of patients had at least on positive reaction, and the most common allergens were nickel sulfate (31.8%), p-phenylenediamine (13.5%), cobalt chloride (10.0%), thiomersal (7.4%), and carba mix (5.5%). Nickel allergen displayed higher positive rates than the rates in other countries. Conclusion: There was no significant difference in the overall positive rate of patch test results compared with recent studies. However, we confirmed that metal-related allergens remain the most common, and that the results provide the basis for the use of the TRUE test in patients with contact dermatitis in Korea.

        • SCOPUSKCI등재

          증례 : 후천성 특발성 전신성 무한증 1예

          오상진 ( Sang Jin Oh ),정의현 ( Euy Hyun Chung ),이상훈 ( Sang Hoon Lee ),박영립 ( Young Lip Park ),이성열 ( Sung Yul Lee ),배유인 ( You In Bae ) 대한피부과학회 2014 大韓皮膚科學會誌 Vol.52 No.3

          Acquired idiopathic generalized anhidrosis (AIGA) is a very rare disease, and its pathogenesis is poorly understood. We here report on a 20-year-old man presenting with a history of inability to sweat, small wheals, and occasional heat intolerance since 3 months. On provocation test, there was no sweating over the entire surface of the body, excluding the palms and axillae. His medical history was unremarkable and laboratory examination findings were all normal. There was no familial history suggestive of neuroendocrine disease. Based on these findings, we diagnosed acquired idiopathic generalized anhidrosis. To our knowledge, this is the first case of AIGA in Korean dermatologic literature. Herein, we report a rare case of AIGA. (Korean J Dermatol 2014; 52(3):191∼194)

        • KCI등재

          충청남도 지역에서 진단된 표피낭종에 대한 임상 및 병리조직학적 고찰

          김성근 ( Sung Keun Kim ),권혁 ( Hyuk Kwon ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),황규왕 ( Kyu Uang Whang ),박영립 ( Young Lip Park ),김준혁 ( Jun Hyuk Kim ),조현득 ( Hyun Deuk Cho ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.5

          Background: Epidermal cysts are the most common type of epithelial cysts of the skin. There have been a few studies to determine the clinical and histopathological characteristics of epidermal cysts. Objective: The purpose of this study was to evaluate the clinicopathological characteristics of 243 cases of epidermal cysts in the province of Chungcheongnam-do. Methods: We retrospectively evaluated the clinical and histopathological features of 243 cases of epidermal cysts at Soonchunhyang University Hospital in Cheonan from January 1998 to December 2008. Results: The ratio of male to female patients was 1.7:1. The age distribution of subjects at the first visit ranged from 11 months to 83 years. The most common site of occurrence was the face. The most common histopathological change of the cystic wall was atrophy. Cystic contents such as calcifications, parakeratotic cells, red blood cells as well as keratinous material were observed. We found stromal changes such as foreign body reactions, fibrosis and granulation tissue. Forty-seven cases were clinically misdiagnosed as other diseases, but subsequent histopathological findings demonstrated the presence of epidermal cysts. No particular relationship was found among duration, size, atrophy of the cyst wall and calcification of keratin material. Conclusion: We reaffirmed contiguity with previous reports. In addition, we found some cases could have been clinically misdiagnosed as other diseases. In addition, there was a poor relationship between the duration of the lesion and other variables such as the size of the lesion, the degree of atrophy of the cyst wall and calcification of keratin material. (Korean J Dermatol 2009;47(5):516~523)

        맨 위로 스크롤 이동