http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개별검색 DB통합검색이 안되는 DB는 DB아이콘을 클릭하여 이용하실 수 있습니다.
통계정보 및 조사
예술 / 패션
<해외전자자료 이용권한 안내>
- 이용 대상 : RISS의 모든 해외전자자료는 교수, 강사, 대학(원)생, 연구원, 대학직원에 한하여(로그인 필수) 이용 가능
- 구독대학 소속 이용자: RISS 해외전자자료 통합검색 및 등록된 대학IP 대역 내에서 24시간 무료 이용
- 미구독대학 소속 이용자: RISS 해외전자자료 통합검색을 통한 오후 4시~익일 오전 9시 무료 이용
※ 단, EBSCO ASC/BSC(오후 5시~익일 오전 9시 무료 이용)
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.
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 ?.
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.
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.
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.
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.
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.
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)
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)