• 한국정밀공학회지
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• 제16권6호
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• pp.45-51
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• 1999

The semi-solid forging is a new forging technology in which the billet is heated to the semi-solid state coexisting liquid and solid phase for making globular microstructure and subsequently formed. As the semi-solid forging is compared with conventional casting such as die casting and squeeze casting for the characteristics of its process, the product without inner defects such as gas porosity and segregation can be obtained and its microstructure is globular grain. Simutaneously, its mechanical properties are improved by globular microstructure and the lower temperature of the slug causes the cycle time of manufacturing to be shortened and the die life to be lengthened. As it is compared with conventional cold and hot forging, it is possible to minimize the equipment of production owing to a lower forming load and reduce the number of process by a followed treatment for complex shaped product. Therefore it is needed to confirm the quality of a semi-solid forged product by defining its characteristics quantitatively under these advantages. This paper investigates the formability of a master cylinder by its forming variables. And the microstructural characteristics and mechanical property of it is also studied.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.956-959
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• 2001

In die and mould industry, major material such as cemented carbide is broadly used for increasing the life time and decreasing the cost. It is also required the development for the skills of wire-cut electrical discharge machining(WEDM), but the WEDMed surface was found to be worst due to the attached components of wire. Precision machining method like lapping is necessary for obtaining high quality surface. The lapping compound such as Al2O3 and SiC and cast iron lap can be used for lapping process. The components of Cu and Zn were found WEDMed surface of the specimen. As the result, the low quality of precision was obtained and the heat damage layer of the specimen was occurred. The value of surface hardness was deteriorated, and therefore finish process was required.

• 철학연구
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• 제142권
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• pp.221-241
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• 2017

논자는 영화예술의 본질을 니체의 예술생리학의 관점에서 해명해보고자 한다. 니체에 따르면 영화에서 빛나는 미장센들은 작가인 감독의 힘에의 의지의 표현이다. 그것은 자, 수, 추 등의 플라톤식 척도로써 모방을 재모방해낸 게 아니라 감독의 몸카메라(body-camera)로써 생의 약동하는 근원 표상 대지(Erde, die $urspr{\ddot{u}}ngliche$ Vorstellung)를 프레임화해낸 것이다. 이런 맥락에서 영화는 본질적으로 몸과 대지가 카메라로 매개되는 생의 예술(die Kunst des Lebens)이라 할 수 있다. 따라서 영화예술을 감상하는 데 필요한 것은 눈이나 머리가 아니라 몸이다. 하지만 이때의 몸은 자본에 의해 조작, 통제, 변용되는 할리우드 표준관객의 둔중한 신체를 뜻하지 않는다. 우리는 상처와 도취로써 흔들리는 몸, 저 춤추는 듯 싱그럽고 가벼운 몸으로 작품 앞에 서야 한다. 이런 경우에만 '몸으로 영화보기'는 일상에서 작은 혁명들을 성취해낼 수 있다. 가령 벨라타르의 영화 <토리노의 말>을 그런 몸으로 접하게 된다면 우리는 더 이상 왜소화된 인간, 저 떼거리화된 인간(der Herde-Mensch)에 머물러 있지 못한다. 또한 벨라 타르의 저 심원한 미장센들은 왜 니체가 '진리로부터 멸망 당하지 않기 위해서 우리에게 예술이 있다'고 했는지 깨닫게 해줄 것이다.

• 한국공작기계학회논문집
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• 제16권5호
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• pp.191-197
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• 2007

Inclined surface milling in the mould and die industries is one of the most commonly needed cutting process. For the variety and complexity of cutting characteristics in various cutting condition, it is difficult to select a optimal tool path orientation. Especially, when the cutting process becomes unstable, it induces self-exited vibrations, a frequent cause of poor tool life, rough surface finish, damage to the workpiece and the machine tool itself, and excessive down time. The comparative results through FFT analysis in this study provide a guideline for the selection tool path orientation.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2006년도 춘계학술발표논문집
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• pp.196-199
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• 2006

프레스금형의 부품 중에서 펀치와 다이플레이트를 제작하는데 주로 W-EDM을 이용한다. W-EDM전에는 기계가공으로 제작된 펀치와 다이플레이트로 제품을 생산하게 되면 생산량이 200만${\sim}$230만개를 생산하고 금형수명을 다하였다. 그러나 W-EDM으로 제작된 금형으로 제품을 생산하게 되면 생산수량이 70만${\sim}$80만개를 생산하고 금형수명이 다하였다. 이것은 W-EDM한 후에 발생되는 가공변질층에 기인하는 것으로 사료되므로 W-EDM전과 W-EDM후의 가공면에 대한 SEM촬영을 실시하여 가공변질층의 발생을 확인하고 이에 대한 제거방법을 연구하였다.

• 비교문화연구
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• 제30권
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• pp.73-95
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• 2013

The purpose of this paper look at the basis of the cultural differences of Korea and Japan by comparing the view about the death. Firstly, in terms of language to express the death, Korea can be summarized 'doragada (go back) Japan can be summarized sayonara(goodbye). Koreans' view about the death is that life and death are not separated and death is the start of another life not the end of existence through 'doragada' Japanese accept death as the order of the universe and the order of nature with resignation. At this time resignation means that Japanese accept the sad feeling to sublimate aesthetically while mourning the death Secondly The view about the death of Sunbee in the Joseon era and Japanese Samurai who were the traditional ideal figures is compared. The Sunbee dies from a justification and the Samurai die from the honor on the other hand. Unconditionally, the sunbee was not loyal to an individual but they thought significantly of the fidelity about the joint value. Unlike this, Japanese Samurai laid stress on the loyalty toward their lord and sacrifice. They selected the death conclusively when this fidelity was suspected. Thirdly the view about the death of Korea and Japan is summarized to the aesthetics of the survival and the aesthetics of the death. Korean saw the death negatively and regard exceedingly the extension of life, they preceded to survive in all kinds of difficulties. On the contrary, Japanese see it positively. They beautified the death and sublimated with the aesthetics. they pursue the nature of the life through the death. Finally, the basic difference of the korean and Japanese culture originate from the view about the death that is, the difference of the values about the life and death.

• 대한의생명과학회지
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• 제22권1호
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• pp.24-28
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• 2016

Tuberculosis (TB) remains an unsolved community health problem since identification of its causing microorganism called Mycobacterium tuberculosis (MTB) by Robert Koch in 1882. Annually, eight million TB cases are newly reported and 2~3 million patients die from TB. Pulmonary TB is highly infectious and untreated pulmonary TB patients are believed to infect >10 people in a year. The conventional methods for diagnosis of TB are chest X-ray and isolation of the causing microorganisms from patient specimens. Screening of TB is conducted with smeared sputum in slides, and TB is confirmed by identification of MTB in cultured specimens. One of the fatal pitfalls of screening detection for smeared sputum is that it is impossible to distinguish MTB and other acid-fast bacilli (AFB) because they are stained equally with Ziehl-Neelsen (ZN) stain. Culture of MTB is the most reliable method for diagnosis of TB but it takes 4~8 weeks. In this report, we suggest a fast and highly-reliable MTB detection method that distinguishes AFB in sputum samples. Purified DNA from the AFB stained slide samples offered by The Korean Institute of Tuberculosis were used to detect infected MTB in patients. PCR, real-time PCR and reverse blot hybridization assay (REBA) methods were applied to purified DNA. Conclusively, the real-time PCR method was confirmed to produce high sensitivity and we were able to further detect drug-resistant MTB with REBA.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2001년도 춘계학술발표회 초록집
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• pp.3-3
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• 2001

Recently TiN, TiAlN, CrN hardcoatings have adapted many industrial application such as die, mold and cutting tools because of good wear resistant and thermal stability. However, in terms of high speed process, general hard coatings have been limited by oxidation and thermal hardness drop. Especially in the case of PCB drill, high speed cutting and without lubricant process condition have not adapted these coatings until now. Therefore more recently, superhard nanocomposite coating which have superhard and good thermal stability have developed. In previous works, WC-TiAlN new nanocomposite film was investigated by cathodic arc ion plating system. Control of AI concentration, WC-TiAlN multi layer composite coating with controlled microstructure was carried out and provides additional enhancement of mechanical properties as well as oxidation resistance at elevated temperature. It is noted that microhardness ofWC-TiA1N multi layer composite coating increased up to 50 Gpa and got thermal stability about $900^{\circ}C$. In this study WC-TiAlN nanocomposite coating was deposited on PCB drill for enhancement of life time. The parameter was A1 concentration and plasma cleaning time for edge sharpness maintaining. The characteristic of WC-TiAlN film formation and wear behaviors are discussed with data from AlES, XRD, EDS and SEM analysis. Through field test, enhancement of life time for PCB drill was measured.

• Design & Manufacturing
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• 제11권1호
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• pp.1-6
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• 2017

In these days, due to generalization of using smart mobile phone and wearable device such as smart watch, demand of Cover-glass and touch screen panel for protecting display increases. With increasing the demand of Cover-glass, slimming technique is promising for weight lightening, zero bezel. Cover-glass produced by this technique is required to decreasing thickness with increase strength. In the Cover-glass manufacturing process, mechanical processing and chemical processing has improve in the strength. Generally, Diamond electrodeposition wheel is used in mechanical process. Reinforced glass with the characteristics of the brittle and high hardness was manufactured by using a diamond electrodeposition wheel. At this time, Because of surface of the tool present non-uniform distribution of diamond particle, it has generate Loading of wheel and it has been decrease life of grinding tool, efficiency of grinding, quality and shape accuracy of workpiece. Thus Research is needed to controling particle distribution of diamond electrodeposition wheel uniformly. And it is necessary to study micro hole machining such as proximity senser hole, speaker hole positioned Cover-glass. Reinforced glass with the characteristics of the brittle and high hardness is difficult to machining. Processing of reinforced glass have generated wear of tool, micro cracks. Also, it is decreasing shape accuracy. In this paper, We conducted a study on how to control particle distribution uniformly about the diamond tool manufactured using elecetodeposition processing. It analyzed the factors that affect the arrangement of the particles in the electrodeposition process by design of experiment. And There is produced the grinding tool, which derives an optimum deposition conditions, for processing Cover-glass edge and the machinability was evaluated.

• 한방안이비인후피부과학회지
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• 제17권1호
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• pp.16-33
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• 2004

In Oriental medicine, aging is just a natural process like change of seasons. Ancient Oriental people accepted it as a natural thing to be growing older and to die at last. The science of aging has advanced dramatically. In the last 2 decades, advances in genetics and molecular biology have led to extraordinary new understandings in how cells age, how apoptosis programs cells to die, and how neuroendocrinology plays a role in the lifespan of organisms. Today, the matter of primary concern about aging is a cellular and mitochondrial damage of human body induced by reactive oxygen species(ROS). The skin aging can be divided into two areas, intrinsic(chronologic)-aging and photo-aging. There are lots of photo damage about skin aging. The skin is increasingly exposed to ultraviolet(UV) irradiation in life. Therefore, the risk of photo-oxidative damage of the skin induced by reactive oxygen species(ROS) has increased substantially. Nowadays, many people believe that they can stop or at least delay the process of aging. There are lots of treatments that promise to slow the process of aging and the associated ailments. Many of these treatments, for example, exercise, Vit E, Vit C therapy, hormone therapy, restrict diet, are gradually being subjected to clinical trials. But in spite of all efforts, researches and investigations, there is no single method or treatment which is revealed to be truly effective for delaying progress of aging. Every methods insisted on effect for delaying aging process, has its dark side. All we can do is just keeping ourself healthy until the time of death.