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      • 만성중이염의 골도청력변화

        박선홍,노용훈,이도용,나한조,김용기,최봉남,도남용 朝鮮大學校 附設 醫學硏究所 1996 The Medical Journal of Chosun University Vol.21 No.1

        We have usually experienced bone conduction impairment in chronic otitis media, but it is unclear that raised bone conduction threshold is due to the reflection of cochlear dam- age and / or Carhart effect ( an artificial elevation of bone conduction threshold due to conductive defect ) or both. The purpose of this study is to verify the influence of the artificial elevation of the bone conduction threshold in chronic otitis media and to estimate Carhart effect. A total of 336 cases of tympanoplasty with unilateral chronic otitis media without any other causes of sensorineural hearing loss was studied. The average threshold levels of the bone conduction in diseased ears ranged from 18.5dB at 4kHz to 12.1dB at 250Hz The longer duration of the disease, the larger perforation size, the more severe damage of the middle ear structure and the presence of the cholesteatoma made bone conduction threshold increased. The postoperative thresholds of bone conduction were Improved in 36 cases (40.4%) of the 89 cases that underwent operation with type I tympanoplasty technique without electrie drilling. The degree of the maximal improvement was 14.3dB at 2000Hz and the minimum was 8.8dB at 250Hz. but these result did differ from a statistically significant degree. The result suggest that the bone conduction threshold in chronic otitis media is elevated artificially by conductive defect and improved by successful reconstructive surgery.

      • 술폰화 폴리스티렌-디비닐벤젠 혼성중합막을 통한 알칼리 금속이온의 전달특성에 관한 연구

        선용호,조영일,한정우 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.1

        The transport characteristics of alkali metal ions, ?? and ??, through a cation exchange membrane was investigated. The membrane used in this experiment was ?? type sulfonated polystyrene-co-divinylbenzene membrane (K-102, Asahi Kasei Co.). The initial flux of the ion was increased with the increase of both ?? ion concentration and temperature. In this experimental range (pH 0.5∼3.0, temperature 15∼60℃), the initial flux of ?? was found to be from ?? to ?? and that of ?? from ??, ??. The membrane was selective for ?? and the flux ratio of ?? to ?? was about 1.10.

      • SHS법으로 TiAl 금속간 화합물의 제조시 첨가원소에 따른 기계적 성질에 관한 연구

        宣炅杓,李龍鎬 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

        TiAl intermetallic compounds are very attractive for high temperature structural applications because of their high specific strength, high temperature oxidation resistance, and superior creep characteristics. In this study, processing of TiAl using self-propagating high temperature synthesis was investigated. The effects of processing varibles including holding temperature and pressure, and alloying element on the microstructure, mechanical properties of TiAl were studied. It was demonstrated that the SHS process could yield TiAls with properties comparable with those of TiAl produced via the ingot metallurgy route.

      • KCI등재후보
      • KCI등재

        국제인권규범을 통한 사회적 기본권의 구체화 가능성 검토

        장선미,성기용 梨花女子大學校 法學硏究所 2018 法學論集 Vol.22 No.4

        사회적 기본권을 헌법에서 직접 규정하고 있는 우리 헌법의 해석론으로 가장 타당한 것은 구체적 권리설이라고 할 수 있다. 그러나 구체적 권리설을 취할 때, 개별 기본권 규정에서 직접 도출될 수 있는 사회적 기본권의 구체적 내용이 무엇이냐에 대한 논의가 필요하다. 사회적 기본권 규정들을 어떤 방식으로 해석하여야 하는지에 대한 문제는 여전히 남아 있기 때문이다. 헌법상 사회적 기본권 규정들의 경우, 사회적 기본권이라는 주관적 권리에 대응하는 국가의 의무에 대한 내용을 함께 규정하고 있는데, 개별 규정에서 규정하고 있는 사회적 기본권의 구체적 내용은 무엇인지, 개인의 권리와 국가의 의무를 함께 규정하고 있는 이유 내지 의미는 무엇인지, 이때의 국가의 사회적 기본권 실현의무의 구체적 내용은 무엇인지를 규명하는 것 또한 구체적 권리설의 과제인 것이다. 사회적 기본권의 주관적 권리성 및 구체적 권리성 인정만으로 사회적 기본권이 개인의 기본권으로 보장되는 정도 내지 구속력이 객관설에 비해 크게 강화되는 것은 아니다. 사회적 기본권의 구체적 내용과 보장의 범위에 대한 더 나아간 논의가 없다면, 객관설이 지적하는 바와 같이 명목상 권리에 그치게 될 수 있다. 이러한 연구과제와 관련하여 생각해 볼 수 있는 연구의 방향은 사회적 기본권이 자유권적 기본권과 마찬가지로 그 토대를 인권에 두고 있다는 점에 주목하여, 국제인권규범 분야에서 사회적 기본권과 동일하거나 유사한 인권에 관한 규범과 그 해석론을 사회적 기본권의 구체적 내용 파악에 활용하는 것이다. 이 가운데 사회권의 최소핵심을 실현하지 않는 국가작용에 대하여는 사법심사의 대상으로 삼아 권리의 침해를 인정하여야 한다는 사회권에 특유한 심사기준인 최소핵심의무는 사회적 기본권에서도 핵심적 내용을 판단하는 기준이 될 수 있다. 최소핵심의무뿐만 아니라 기본권의 구체적인 내용을 규정하고 있는 국제인권규범은 헌법재판소의 심사 과정에서도 사회적 기본권을 구체화시키는 기능을 할 수 있다. The most reasonable interpretation of the Constitution which social rights are directly defined in it is to accept such a right as a subjective right. However, there remains the further question as to whether social rights have their own scope and to what they are and to what extent they need to protect constitutionally. These are the questions related to how to interpret the constitutional provisions to entrench social rights in the constitutional law. Many theories try to solve these problem. Some theories assert that social rights have just the objective value like the constitutional principles or that they have the character as weak subjective rights. But it is not accepted because the constitutional law explicitly has provisions related to social rights. Social rights must be understood as subjective rights like freedom or liberties and the state has to owe the positive obligation to protect the rights when the constitutional law stipulates social rights provision. The constitutional court does not review cases related to social rights positively. It claims that it is difficult to materialize social rights and the legislator has to solve the difficulty because the constitutional law authorize legislator to materialize social rights. These claims are very plausible. Actually democratic legitimacy of legislator is stronger than the constitutional court. But the constitutional law authorize the constitutional court to protect people by interpreting the constitutional law at the trial. So the constitutional court has to try to seek reliable criteria. International human rights norms can suggest direction for the court. Especially the minimum core of economic, social and cultural rights or the minimum core obligation of the state help the court suggesting effective criteria.

      • 어머니의 경제활동이 중학생의 식습관 및 식생활 태도에 미치는 영향

        선윤정;이순희;박용순 한양대학교 2011 韓國 生活 科學 硏究 Vol.31 No.2

        The study was conducted to investigate the effect of mother's employment status on dietary habits and behaviors in 258 middle school students(114 boys and 144 girls). The percentage of employed mother was higher (57.0%) than that of non-employed mother (43.0%), and there was significantly more boys than girls in group of employed mother. Students with employed mother ate breakfast alone significantly more than those with non-employed mothers. Students with employed mother eat significantly more delivered foods (including dining out) for dinner than those with non-employed mothers. Students with employed mother bought snacks and liked junk food (fast food, instant food) significantly more than those with non-employed mothers. In addition, students with employed mother watched TV while having meals and drunk more soft drink than those with non-employed. mothers. In conclusion, mother’s employment status was the most important factor influencing dietary habits and behaviors of students. Therefore, students with employed mother's may required special attention for nutrition education.

      • KCI등재후보

        충전탑형 무산소/호기 공정에서 반송비에 따른 유기물 및 질소 제거 특성

        선용호 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

        This study was focused on the investigation of the characteristics of organics and nitrogen removal with the recycle ratio in anoxic/oxic(A/O) packed bed process that consisted of the anoxic reactor and the aerobic reactor. As increasing the recycle ratio by 0.5, 1.0, 2.0, the COD removal efficiency increased by 94.0%, 98.5%, 98.8% respectively. The aerobic reactor showed the perfect nitrification efficiency by 98.5% 99.2%, 98.0% respectively. the T-N removal efficiency with the recycle ratio, increased by 56%, 67%, 70% respectively. As increasing the recycle ratio by 0.5, 1.0, 2.0, T-P removal efficiency decreased by 62.1%, 57.4%, 51.3% respectively. The process by releasing the stored phosphours in the anoxic reactor and uptaking the excess phosphours in the aerobic reactor, occurred well comparatively when recycle ratio is 0.5. But this process did not occur when the recycle ratio is 1.0 and 2.0. And optimum pH of nitrification was about 6~7 and alkalinity decreased as nitrification rate increased. As increasing the recycle ratio in the anoxic reactor, DO concentration and ORP increased.

      • 선형 이산 시스템 평형형 近似에 있어서 周波數 特性의 改善

        문용선 순천대학교 공업기술연구소 1993 工業技術硏究所論文集 Vol.7 No.-

        For a good approximation of a system, both the poles and the zeros have to be accurately approximated to the ideal model. This paper describes a technique which utilizes the least controllable and observable sub-system in driving an approximation model by the balanced realization and a frequency weighted-model for some additional good properties. By the simulation results, we anaylize and compare the frequency response of the original realization, the balanced realization, and the frequency weighted realization.

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