• Title, Summary, Keyword: sun protection use

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Hindfoot Endoscopy for the Treatment of Posterior Ankle Impingement Syndrome: A Comparison of Two Methods (a Standard Method versus a Method Using a Protection Cannula) (후방 발목 충돌 증후군에서의 후족부 내시경 사용: 고식적 방법과 보호 도관을 이용한 방법의 비교)

  • Kim, Eung-Soo;Lee, Chang-Rak;Kim, Young-Jun;Roh, Sang-Myung;Park, Jae-Keun;Gwak, Heui-Chul;Jung, Sun-Gyu
    • Journal of Korean Foot and Ankle Society
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    • v.22 no.1
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    • pp.26-31
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    • 2018
  • Purpose: The purpose of this study is to compare the clinical results between two different methods of hindfoot endoscopy to treat posterior ankle impingement syndrome. Materials and Methods: Between January 2008 and January 2014, 52 patients who underwent hindfoot endoscopy were retrospectively reviewed. Two methods of hindfoot endoscopy were used; Group A was treated according to van Dijk and colleagues' standard twoportal method, and group B was treated via the modified version of the above, using a protection cannula. For clinical comparison, the American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot score, time required to return to activity, and the presence of complications were used. Results: There was no statistically significant difference in the AOFAS scores at the final follow-up, and there was also no statistically significant difference in the times for the scores to return to the preoperative level. There were no permanent neurovascular injuries and wound problems in either group. Conclusion: Use of protection cannula may provide additional safety during hindfoot endoscopy. We could not prove whether protection cannula can provide superior safety for possible neurovascular injury. Considering the possible safety and risk of using additional instrument, the use of this method may be optional.

Protection Resistance Determination for Field Winding in Superconducting Generator (초전도발전기의 계자권선 보호저항 선정에 관한 연구)

  • Kang, Joon-Sun;Nah, Wan-Soo;Kwon, Young-Kil;Sohn, Myoung-Hwan;Ryu, Kang-Sik
    • Proceedings of the KIEE Conference
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    • pp.238-240
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    • 1999
  • In this paper, the protection resistance determination for the field winding in superconducting generator is suggested. To protect the field winding in a generator, they usually use the external resistance to decrease the field current more rapidly when quench occurs in the winding. Since the field winding is actually separated into four sections (magnets), we have choices to insert 1, 2, and 4 external resistances. For each case, the current decay and the voltages across e winding are calculated, and we can choose the best external resistance.

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The Status and Development Trend of Nature Reserves in Heilongjiang Province, Northeastern China

  • Piao, Xi-Wan;Hong, Sun-Kee
    • The Korean Journal of Ecology
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    • v.23 no.4
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    • pp.339-345
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    • 2000
  • Heilongjiang Province has set up 104 nature reserves, with a total area of 2,641,700 ha, or 5.88% of the total area of the province. These constitute a network of nature reserves comprising most important types of nature reserves. and play an active role for improving the protection of the ecological environment and for the continuous economic and social development of the province. But in the management of these nature reserves, there are still some problems with people's idea, with educating the public, and with capital investment. These problems should be treated seriously. To preserve our natural heritage and biodiversity and to promote the sustainable development of our society and economy, it is projected that by the year 2000. the number of nature reserves in Heilongjiang is to reach 109, covering 6.17% of the total land area of the province. This percentage will be further increased to 8.62% by 2010, at which time the network of nature reserves is to have a proper distribution and comprehend all the important types of nature reserves. This will ensure the healthy development of the cause of nature conservation. with systematic planning, active protection. and sustainable use, so that ecological and social benefits can be developed hand in hand with economic benefits.

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Studies of the Radiation Effects on Mouse Germ Cell (방사선(放射線)이 생쥐생식세포(生殖細胞)에 미치는 영향(影響)에 관(關)한 연구(硏究))

  • Chung, Kyu-Hoi;Chun, Ki-Jung;Chung, Hai-Won;Yoo, Byung-Sun;Lee, Jeong-Ho
    • Journal of Radiation Protection and Research
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    • v.10 no.1
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    • pp.29-40
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    • 1985
  • The objectives of present study is to investigate genetic damage of radiation in mammalian male germ cell and. to establish available screening method for determining genetic hazard by radiation. Several methods were employed to measure the genetic damage of radiation as follows: Sperm head counts, frequency occurrence of sperm with abnormal head shape, fertility, activity of LDH-X, and the induction of unscheduled DNA synthesis (U.D.S.) in male mouse were performed with the passing of time after irradiation by making use of the sequence of event that occurs during spermatogenesis. Sperm head counts and activity of LDH-X in testes were gradually reduced by increased radiation dose and with the passing of the time after irradiation. Frequency occurrence of sperm with abnormal head shape, sterile period, and the induction of unscheduled DNA synthesis were increased by increased radiation dose. It is suggested that since germ cell is a direct reflection of genetic complement, the use of male germ cell is rapid and convenient method for measuring genetic damage by radiation.

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A Secure Index Management Scheme for Providing Data Sharing in Cloud Storage

  • Lee, Sun-Ho;Lee, Im-Yeong
    • Journal of Information Processing Systems
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    • v.9 no.2
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    • pp.287-300
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    • 2013
  • Cloud storage is provided as a service in order to keep pace with the increasing use of digital information. It can be used to store data via networks and various devices and is easy to access. Unlike existing removable storage, many users can use cloud storage because it has no storage capacity limit and does not require a storage medium. Cloud storage reliability has become a topic of importance, as many users employ it for saving great volumes of data. For protection against unethical administrators and attackers, a variety of cryptography systems, such as searchable encryption and proxy re-encryption, are being applied to cloud storage systems. However, the existing searchable encryption technology is inconvenient to use in a cloud storage environment where users upload their data. This is because this data is shared with others, as necessary, and the users with whom the data is shared change frequently. In this paper, we propose a searchable re-encryption scheme in which a user can safely share data with others by generating a searchable encryption index and then re-encrypt it.

Study on the Sun Screen Test Method using Elipsometer (분광타원해석기를 이용한 자외선 차단제의 평가방법 연구)

  • Kim, Joon-Woo;Lee, Jong-Soo;Lee, Ji-Hye;Choung, Suk-Jin
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.37 no.2
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    • pp.137-141
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    • 2011
  • Sunscreen is divided into the organic agent of UV absorption and inorganic agent of reflection. These are evaluated by sun protection factor (SPF) in-vivo test requiring high cost and time, while in-vitro tests are adopted commonly because of short test time, easy result collection. Generally, test method of SPF use SPF 290a by UV-vis spectrometer. The evaluate by SPF 290 has low reproducibility. Although analysis using UV-vis spectrometer has high reproducibility, it is hard to separated results of transmission, adsorption, and reflection. In this study, suggested method of elipsometer has some merit such as high reproducibility, easy separation of transmission/adsorption/re- flection, analysis using various incident angle. We tested the validity of elipsometer for SPF measurement, using commercially available sun-block (SPF 50).

Effective Evaluation of Quality of Protection(QoP) in Wireless Network Environments (무선 네트워크 환경에서의 효과적인 Quality of Protection(QoP) 평가)

  • Kim, Hyeon-Seung;Lim, Sun-Hee;Yun, Seung-Hwan;Yi, Ok-Yeon;Lim, Jong-In
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.18 no.6A
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    • pp.97-106
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    • 2008
  • Quality of Protection(QoP) provides a standard that can evaluate networks offering protection. Also, QoP estimates stability of the system by quantifying intensity of the security. Security should be established based on the circumstance which applied to appropriate level, and this should chose a security policy which fit to propose of network because it is not always proportioned that between stability of security mechanism which is used at network and performance which has to be supported by system. With evolving wireless networks, a variety of security services are defined for providing secure wireless network services. In this paper, we propose a new QoP model which makes up for weak points of existing QoP model to choose an appropriate security policy for wireless network. Proposed new QoP model use objectively organized HVM by Flow-based Abnormal Traffic Detection Algorithm for constructing Utility function and relative weight for constructing Total reward function.

A Study on the HEC(Hybrid ESE-Conductor) Method for Lightning Protection of Buildings (건축물의 낙뢰보호를 위한 HEC(Hybrid ESE-Conductor) 방식에 관한 연구)

  • Kim, Dong-Jin;Kim, Young-Sun;Lee, Ki-Sik
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.2
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    • pp.146-152
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    • 2008
  • The frequency of lightning is increased due to improbable weather condition and global wanning. This phenomenon increases economical damage as well as human damage. Advanced countries like europe and north america have applied the facility standard of lightning by accumulating a store of quantitative data about lightning research. Lightning facility is composed of the lightning accepting part for induction lightning, ground connected electrode which conducts lightning current. The lightning accepting part is composed of normal rod, horizontal conductor, ESE lightning rod. Moreover, lightning accepting part is taken to use by the method of protection. This paper suggests HEC(Hybrid ESE-Conductor) method which mixes horizontal conductor and ESE lightning rod. This is also discovered by experiment that the starting point of corona discharge current is low, so it is efficient for lightning protection comparing with other methods. Moreover, distribution of electric field is analyzed qualitatively by finite element method. It also results in the relation of the starting point of corona discharge current. Corona discharge current makes minute current about some ${\mu}A$ between the electrodes by the strength of electric field. Also it occurs insulation destruction of gas, and it is developed to the shape of streamer by increase of the strength of electric field. We can find that the initial occurrence of streamer and contact probability of lightning can have advantage after researching the starting point of corona discharge current and discharge current of lightning striking point. This research demonstrates that the suggested HEC method is economically competitive as a lightning protection facility, and it takes a capably perfect role.

Implementation of the portable brake judder measurement system by use of the Labview (LabView를 이용한 휴대형 브레이크 저더 측정 시스템 구현)

  • Shin, Dong-Uk;Kim, Sun-Hyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.3
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    • pp.569-574
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    • 2008
  • In Because DTV comes to origin of car body shock or brake pedal flutter occurrence in car. This in development of measurement device that can examine this in driver protection dimension or at production early sending of goods visual point purpose of this study have. In this paper, I developed portable Brake Judder measurement system by use of the DTV.

Rates and Methods of Contraception Among Korean Adolescents from 2007 to 2009 (청소년들의 피임실천율 및 피임방법(2007~2009년))

  • Lee, Han-Ju;Kang, Hee-Sun
    • Korean Journal of Women Health Nursing
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    • v.17 no.2
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    • pp.148-156
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    • 2011
  • Purpose: This study was done to explore the rates and methods of contraception among Korean adolescents from 2007 to 2009. Methods: The study was a descriptive study. The data were taken from a web-based survey on risk behavior of Korean youth that was conducted between 2007 and 2009 by the Korea Centers for Disease Control and Prevention. Results: Among adolescents, 4.7% in 2007, 4.6% in 2008, and 4.7% in 2009 reported having had sexual intercourse. In those who had sexual experiences, less than 30% reported consistent use of contraception, whereas more than 45% report no contraceptive use at all. A condom was the most frequently used contraceptive method and its use has increased continuously among contraceptive users. Some of the adolescents were, nevertheless, using unreliable methods such as withdrawal or the rhythm method. Conclusion: The results of this study indicate that most adolescents are not using contraception consistently and some were relying on unreliable contraceptive methods. Efforts to raise awareness about consistent and correct contraceptive use and the importance of dual protection are essential.