• The Science & Technology
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• v.32 no.9 s.364
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• pp.92-93
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• 1999

성생활은 생활의 만족감을 향상시키고 대인관계를 원활케 하여 장수에도 도움이 된다. 항간에는 섹스에 관련된 루머들이 많은데 전문가들의 연구결과를 보면 '성생활을 일찍 중단한 남자는 사망률이 높다.', '자위행위와 발기장애는 무관하다.', '정상적인 식사는 별도의 정력제가 필요없다.'는 것이다. 또 '정관수술을 하면 전립선 암에 걸릴 가능성이 많다'는 소문도 연구결과 전혀 사실무근임이 밝혀졌다.

• Defense and Technology
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• no.9 s.247
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• pp.46-55
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• 1999

일본의 육상자위대는 공식적인 군대는 아니지만, 실제적인 규모나 편제는 엄연한 군대 조직을 갖추고 있고, 높은 기술 수준과 400억 달러를 초과하는 방위비의 규모를 가진 것만으로도정치력과 군사력의 토대가 된다는 점에서 일본의 군사력은 이미 강대국 수준에 도달해 있다고 할 수 있으며, 현재는 PKO 등을 통하여 평화 유지라는 명분으로 병력을 해외에 파병하고있어, 과거 일본으로부터 침략을 당하여 주권을 상실했던 아픈 역사를 가지고 있는 아시아 각국에 위기감을 더해 주고 있다.

• Defense and Technology
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• no.4 s.242
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• pp.82-87
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• 1999

전투원(전투병사) 개인방호체계는 각개병사와 병사들이 전술적 환경에서 사용하기 위해 착용, 소모, 휴대하는 모든것을 포함하는 방호체계들의 시스템이다. 이러한 전투원 개인방호체계의 현대화 노력은 "위력", "지휘 및 통제", "생존성", "유지능력", "기능성"을 극대화하고 전투원 체계들을 디지털 전장에서 통합함으로써 전투상승효과를 달성할 수 있다

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.148-157
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• 2013

This study investigated the motivations for internet pornography search and perception on cybersex focusing on the role of gender difference and previous internet pornography use with 203 college students. The motivations included sexual relationships, masturbation, and sexual curiosity factors. Males searched for sexual relationships and masturbation, but females searched for satisfying sexual curiosity. The perception on cybersex included 2 factors-alternative sex and real sex. For males and females, no differences were found in the perceptions of engaging in sexual behavior exchanging sexual messages online similarly. The implications of the research were discussed in terms of sexual health.

• The Journal of Korean Academic Society of Nursing Education
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• v.8 no.1
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• pp.145-154
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• 2002

Purpose : The purpose of this study was to investigate the experiences of masturbation among high school students. Method : The subjects were 925 high school students in Busan. Masturbation experience, hygienic management and physical, psychological condition after masturbation were measured. The data was collected from December 1998 to February 1999. The collected data was analyzed with frequency, percentage, mean, $x^2$ -test, t-test. Result : 1) There were significant differences in masturbation experiences according to frequency($x^2$=547.94, p=.000), educational participation($x^2$=12.11 p=.001) and hygienic management(t=3.661, p=.001) between boys and girls. 2) Contact of lewd mass media stimulated students to do masturbation and they used various methods such as stimulating genital area by using hand or tools, fantasizing about sex 3) Subjects reported that they experienced fatigue, sleeping disturbance, decreasing concentration and learning desire after masturbation. Conclusion : This study suggests that replicate studies are needed. The results are also useful in developing various sex education program.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.9
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• pp.52-60
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• 2017

This study examined the structural stability of nonlocal magneto-electro-elastic nano plates on elastic foundations using first-order shear deformation theory. Navier's method has been used to solve the buckling loads for all edges simply supported boundary conditions. On the other hand, biaxial buckling analysis of nano-plates has beenrarely studied. According to the Maxwell equation and the magneto-electro boundary condition, the change inthe magnetic and electric potential along the thickness direction of the magneto-electro-elastic nano plate wasdetermined. To reformulate the elasticity theory of the magneto- electro-elastic nano plate, the differential constitutive equation of Eringen was used and the governing equation of the nonlocal elasticity theory was studied using variational theory. The effects of the elastic foundation arebased on Pasternak's assumption. The relationship between nonlocal theory and local theory was analyzed through calculation results. In addition, structural stability problems were investigated according to the electric and magnetic potentials, nonlocal parameters, elastic foundation parameters, and side-to-thickness ratio. The results of the analysis revealedthe effects of the magnetic and electric potential. These calculations can be used to compare future research on new material structures made of magneto-electro-elastic materials.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.58 no.3
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• pp.283-291
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• 2013

Rice varieties with suitable flour-making quality are required to promote rice processed-food industry and boost rice consumption in Korea. 'Namil (SA)-flo1' is an advanced mutant line with floury endosperm which shows good flour-making quality under dry-milling process. Genetic analysis was carried out to localize the chromosomal region responsible for the floury endosperm of 'Namil (SA)- flo1'. By using 94 F2 progenies, which were derived from 'Namil (SA)-flo1' ${\times}$ 'Milyang 23', floury grains percentage was investigated as phenotypic data, and genotyping was conducted with 54 SSR markers. Association analysis showed that the target genetic region for floury endosperm is on middle-low region of chromosome 5. Through further association analysis with increased number of SSR markers on chromosome 5, we found that genotypic variation in RM164 explains 79.7% of the variation in floury grains percentage of F2:3 seeds. The floury endosperm locus was localized on 17.7-20.7 Mbp region of chromosome 5 and will be further analyzed for fine mapping and gene identification.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.4
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• pp.905-917
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• 2018

The sovereign state has the right to engage in self-defense or war with the approval of the Security Council when it receives an invasion of territory from a foreign country. War is conducted under the principle of the necessity and proportionality of self-defense. In case of cyber attack, proportional countermeasure must be made through attack means and effect analysis, and cyber weapons need to be classified for this purpose. Therefore, this study aims to provide a rational and legitimate response according to the necessity and proportionality of the self - defense right by suggesting definition and classification criteria of cyber weapons. In this study, cyber weapons were defined as "means of collecting, attacking, and protecting information using cyber technology in the cyber space according to military objectives. Based on existing weapon systems and public cyber weapons cases, cyber weapons were classified as (1) cyber weapons for information gathering, (2) cyber weapons for attack, and (3) cyber weapons for protection. We suggest the considerations for applying the proportional response according to this functional classification. In order to guarantee the principle of proportionality to cyber attacks in the future, the classification study based on the cyber weapon effect should be conducted. This study has conducted an exploratory study on the classification of cyber clusters which constitutes one axis of the proportionality principle.

• Maritime Security
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• v.2 no.1
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• pp.43-70
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• 2021

This study started from questioning our general view that the Japan Maritime Self-Defense Force (JMSDF) is a natural result of Japan being a prosperous and island country. Japan's naval power collapsed after World War II. The initial power of the JMSDF, founded in 1954, was very small and not different from the Republic of Korea Navy (ROKN), mostly consisting of ships given by or borrowed from the US. Although growing into the world's second-largest economy and the geographical characteristics of an island nation acted as an opportunity to increase naval forces, there were also difficulties in the early stage, such as a temporary severance with the Japanese Navy, strategic thinking centered on land forces, and an economic crisis caused by the oil crisis. As a result, the JMSDF has become a world-class naval power and is developing into a four helicopter carrier operating system, which may change the basic concept of exclusive defense. There are various factors behind the growth of Japan's naval power, but this study explores how to develop Korean naval forces by analyzing how Japan developed their escort fleet, the core of the JMSDF, focusing on the eight (艦)-eight (機) fleet system, which was the basic logic behind building the JMSDF.

• The tire
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• s.73
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• pp.15-19
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• 1977

원고문제등은 과거의 타이어수출 업무에서는 전연 무연한 일이었다. 연이나 이것이 1원의 차손으로 일본의 타이어계에 끼치는 영향은 월간 5천만원, 반기에서 수10억원 이라고 해서는 그냥 앉아서 간과할 수는 없다. 아니 그뿐 아니라 매일의 환시세 조차 타이어수출 채산성의 열쇠를 장악하는 중대문제로까지 발전하고 있다. 하나, 여하한 타이어계의 힘을 갖고서도 환시세만은 어떻게 할 방법이 없다. 그래서 자위책으로써 고려되는 수단은「코스트 다운과 타이어 수출 가격의 인상」이라고 단언하는 이는 BS타이어의 석부상무이다. 그리고 또한 「코스트 다운은 어디까지나 기업전체의 문제, 당면한 수출 업무로써 이룩할 수 있는 것은 가능한 가격인상뿐」이라고 첨언, 또한 「지금이야 말로 세계의 일류품에의 자랑을...」이라고 설명한다.