Review On Current Issues Of The Unrelated Randomized Response Technique

최경호,Choi, Kyung-Ho 한국데이터정보과학회 2002 한국데이터정보과학회지 Vol.13 No.1

Recently, it is shown that the unrelated quest ion randomized response models proposed by Moors (1971), Folsom et al.(1973), Greenberg et al.(1971) are in capable of protecting the privacy of the respondent. Thus, in this paper, we review recent days research tendency. Also modification model of Mahmood et al.(1998) is proposed, and we show th at this model is more efficient than Greenberg et al.(1969). Furthermore we treat the privacy protection based on Lanke's (1975) risk of suspicion measure.

개정된 항공영어구술능력시험(EPTA)의 안면타당도 분석 - 조종사의 비행경력을 중심으로-

최경호,김수연,Choi, Kyung Ho,Kim, Soo-Yoon 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.4

The purpose of this study was to analyze the face validity of the revised EPTA (English Proficiency Test for Aviation) to see if the tests actually contribute to the enhancement of aviation safety and achieve the purpose of the assessment. In order to reach the above objectives, 103 pilot test takers were surveyed, and nine in-depth interviewees were selected and interviewed. In addition, detailed research results were derived by dividing the participants into the pilot's flight experience (31 captain pilots, 42 first officer pilots, and 30 general commercial pilots). As a result, pilot participants were generally aware that EPTA was more reasonable because the revised EPTA properly implemented the aviation situation and gave participants motivation to learn aviation English. It was also seen that first officer pilots had a higher face validity of EPTA than captain and general commercial pilots. The reason was that first officer pilots considered air traffic control job was more important than other pilots did.

Web기반 원격교육에서 학습자 분석 시스템의 설계 및 구현

최경호,이수정,이재호,Choi, Kyung-Ho,Lee, Soo-Jung,Lee, Jae-Ho 한국정보교육학회 2001 정보교육학회논문지 Vol.5 No.1

As the result of the rapid development of communication technology makes the circumstance and method of education change, distance education is adapted to new fields of education so that students can be educated what they need in the time and space which they want instead of relying on the existing physical frameworks. In this paper Learner-Analysing System was designed and implemented in the distance education based on the web. For the easy access and the demand of customers, this Learner-Analysing System is composed of the Q&A-processing module which can produce proper results for questions and acquisitions of their own study materials through efficient search, and the student-analyzing module for reinforcement of feedback through correct analysis.

해외관광 수요예측 모형에 관한 연구 제목 - 중력모형과 회귀모형

최경호,김재훈,Choi, Kyung-Ho,Kim, Jae-Hoon 한국데이터정보과학회 2001 한국데이터정보과학회지 Vol.12 No.2

과거 오랫동안 기업가나 팝슨(1979) 등의 학자들에 의해서 21세기의 가장 큰 산업이 될 것이라고 예측된 관광산업은 오늘날 단일산업으로는 세계 최대 규모이다. 관광분야에 대한 연구 중, 관광현상을 과학적이고 객관적으로 분석할 수 있는 방법론을 연구하고 제시하며 응용하는 분야로 관광조사분석론을 들 수 있다. 그런데 여기서 다루어지는 내용 중 관광수요와 마케팅분야가 핵심분야로 여겨진다. 오늘날 경제성장에 기인하여 해외관광은 급격한 성장을 보이고 있다. 이러한 상황에서, 관광마케팅을 위한 올바른 관광정책 수립에 필요한 해외관광 수요예측이 요구되는 바, 본 논문에서는 이러한 해외관광 수요예측을 위 한 중력모형과 회귀모형 에 대해서 비교해 보았다. 또한 중력모형을 이용한 수요 예측 시 우리실정에 맞는 여행유입요소를 제안하고, 이를 이용한 모형 비교분석을 실시해 보았다. Now a day, overseas tour which is due to economic development grows very much. In this situation, a forecast of overseas tour is required to establish tourism policy for tourism marketing. In this paper, we compare regression model and gravity model for a forecast of overseas tour. Using gravity model, this study also suggests an attraction which is suitable to our situation, and suggested attraction is compared and analyzed with another.

의약물질의 환경오염과 환경보건

최경호,김판기,박정임,Choi, Kyung-Ho,Kim, Pan-Gyi,Park, Jeong-Im 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.6

Pharmaceuticals in the aquatic environment are trace contaminants of growing importance in environmental health due to their physiologically active nature. Pharmaceuticals could affect non-target species and might eventually damage sustainability of susceptible populations in the ecosystem. Potentials for health consequences among susceptible human population cannot be ruled out since long-term exposure to cocktails of pharmaceuticals, which might be present in drinking water, is possible. Selection of antibiotic resistant microorganisms is of another concern. In order to understand, and if needed, to properly address the environmental health issues of pharmaceutical residues, knowledge gaps need to be filled. Knowledge gaps exist in many important areas such as prioritization of target pharmaceuticals for further risk studies, occurrence patterns in different environments, chronic toxicities, and toxicities of pharmaceutical mixtures. Appropriate treatment technologies for drinking water and wastewater could be developed when they are deemed necessary. One of the simplest, yet most efficient measures that could be undertaken is to implement a return program for unused or expired drugs. In addition, implementation of environmental risk assessment frameworks for pharmaceuticals would make it possible to efficiently manage potential environmental health problems associated with pharmaceutical residues in the environment.

변이주 Bacillus sp. A4442에 의한 갈락토스 전이활성이 높은 ${\beta}-Galactosidase$의 생산

최경호,양성준,김민홍,한금수,양지원,정진,인만진,Choi, Kyung-Ho,Yang, Sung-Joon,Kim, Min-Hong,Han, Keum-Soo,Yang, Ji-Won,Jung, Jin,In, Man-Jin 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.6

토양으로부터 분리된 Bacillus sp.A1 균주는 가수분해활성보다는 전이활성이 훨씬 높은 ${\beta}-galactosidase$를 생산하기 때문에 산업적 응용 가능성이 있으나, glucose에 의한 catabolite repression을 보일 뿐만 아니라 lactose를 inducer로 요구한다는 결정적인 단점이 있어 갈락토올리고당의 제조에 직접 사용하기에는 적합하지 않았다. 따라서 galactose 전이효소의 생산성 제고를 꾀하기 위하여 N-methyl-N'-nitro-N-nitrosoguanidine를 이용한 3단계 변이를 시도하여 A4442변이주를 선발하였다. 이 변이주의 효소생산 능력은 괄목할 만큼 향상하였으며(약 20배 내외) catabolite repression과 lactose 요구성이 상당히 해제되었음을 확인하였다. 아울러 갈락토스가 새로운 inducer로 작용하는 것도 관찰하였다. 변이주를 이용한 발효시에 당의 농도와 배양액의 pH는 상호연관되어 효소의 생산에 영향을 끼쳤다. pH stat 기법을 이용하여 배양중 당의 농도를 0.5% 이하로 조절할 때 pH는 $6.5{\sim}7.5$ 범위내로 유지되었으며 효소활성은 $44\;unit/m{\ell}-broth$로 높게 나타났다. In an attempt to improve the productivity of ${\beta}-galactosidase$ from Bacillus sp. A1, which was isolated from soil and has remarkably higher transgalactosylation activity than lactose hydrolysis activity, a chemical mutation procedure using N-methyl-N'-nitro-N-nitrosoguanidine followed by selection was conducted. The final selection, designated as Bacillus sp. A4442, turned out to show a substantially increased enzyme productivity. Catabolite repression by glucose and lactose requirement as an inducer for the enzyme biosynthesis, which were shown in the parent strain, was markedly diminished; instead it was found out that galactose acts as another inducer. Because pH of medium, one of the most important factors for cell growth as well as enzyme production, is closely related with the sugar concentration during culture, it was kept in the optimum range of $6.5{\sim}7.5$; for this the initial glucose concentration was adjusted to be 0.5% which was thereafter maintained by the controlled pumping-in of lactose using the pH-stat technique. By doing so, we were able to increase the productivity of ${\beta}-galactosidase$ with high transgalactosylation activity up to $44\;unit/m{\ell}-broth$.

ESP 관점을 통한 항공영어구술능력평가(EPTA)의 발전방안: 조종사의 비행경력을 중심으로

최경호 ( Choi Kyung Ho ),김수연 ( Kim Soo-yoon ) 한국ESP학회 2020 ESP REVIEW Vol.2 No.2

The purpose of this study is to discuss a development plan for EPTA through ESP perspective. In order to achieve the objective, a total of 103 pilot test takers were surveyed and nine interviewees were selected for in-depth interviews. They were divided three different groups according to the pilot’s flight experience (31 captain pilots, 42 first officer pilots, and 30 general commercial pilots). As a result, EPTA is recommended to provide test sample grade answers to improve the reliability of test results. In addition, to adjust test difficulty, it will be needed to increase the proportion of Part 1 and increase the response time of Part 2. It is also necessary to establish a standardized EPTA training program for general commercial pilots or to hold regular aviation English seminars to improve EPTA capability of pilots. It will also be required to expand the location and time of the test and to reduce the test fee. Regarding the introduction of the advanced foreign aviation English test system, there is need to delegate EPTA to airline company or maintain qualification above Level 4 by finishing EPTA ground lessons like JLTA (Japan). Moreover, like RELTA in Australia, EPTA questions should be provided in the form of actual pictures and photos of cockpit and flight conditions to help test takers understand the test better.

바륨설페이트/티타늄디옥사이드/디메치콘의 복합화 및 메이크업에서의 응용

최경호 ( Kyung-ho Choi ),고성용 ( Seung-yong Ko ),강학희 ( Hak-hee Kang ),이옥섭 ( Ok-sub Lee ) 대한화장품학회 2004 대한화장품학회지 Vol.30 No.2

감촉 및 광학적 요소는 파우다 파운데이션에 있어서 매우 중요한 요소이다. 이러한 감촉과 광학적인 요소를 동시에 만족하는 분체에 관심을 가지고 다양한 소재 및 제조방법을 연구 중에 바륨설페이트를 기본 입자로 하는 복합화 된 분체를 개발하게 되었다. 바륨설페이트는 입자의 모양이 매우 넓고 표면의 굴곡이 없는 판상으로 감촉면에서 부드러운 사용성과 균일한 부착 특성을 나타내며 굴절율도 피부보다 약간 높은 수준으로 인위적이지 않고 자연스러운 광학적 특성을 나타내고 있다. 그러나 파운데이션에서 요구되는 광학적 특성인 자외선 차단능력이나 커버력, 블루밍 효과에 있어서는 기대수준에 못 미치는 것을 알 수 있었다. 이러한 특징은 파우다 파운데이션에서 사용되는 대부분의 분체에 있어서 공통적으로 나타나는 특성으로 감촉적인 측면(소프트, 밀착력 등)과 광학적 측면(커버력, 자외선 차단력 등)을 동시에 만족하는 분체가 극히 드문 것을 알 수 있다. 본 연구에서는 이러한 점을 극복하고자 감촉적인 측면에서 우수한 바륨설페이트를 모입자로 하고 자외선 차단능력과 블루밍에서 우수하나 자체의 응집력이 강하고 사용감이 거친 특징을 나타내고 있는 티타늄디옥사이드를 자입자로 하여 복합화하려 하였다. 이때 중요 요소로 복합화 되는 티타늄디옥사이드의 함량에 따라 복합안료의 감촉적인 측면과 분산력 등이 민감하게 달라지는 것을 알 수 있었다. 이에 패널을 이용하여 복합안료의 사용성에 영향을 미치지 않는 수준의 함량을 결정하여 복합화 처리했으며, 사용자가 피부에 도포시 발생되는 피지나 땀에 대한 변색과 사용감을 고려하여 피지나 땀에 강한 발수, 발유 능력을 나타내며 부드러운 감촉의 디메치콘으로 복합안료를 코팅 처리하여 복합분체를 만들게 되었다. 이렇게 만든 복합분체(barium sulfate/TiO₂/dimethicone)를 패널을 이용한 테스트와 기기를 이용한 테스트를 실시하여 효과를 검증하게 되었다. Sensor and optical properties have become critical features in powder foundation. The flaky barium sulfate powder shows good smooth texture, adhesion and natural looking characteristics. However, it has limitations abilities in UV shielding, hiding and blooming effect. Thus we adopt TiO₂ that has excellent hiding power and blooming effect as well as UV shielding ability, but TiO₂ has still intrinsic problems in dispersion and texture. To overcome this disadvantages, the barium sulfate/TiO₂/dimethicone composite powder was prepared. The flaky barium sulfate powder was coated with TiO₂ in nanoscale and followed by coated with dimethicone. When this surface-modified powder was applied for make-up cosmetics, especially in powder foundation, the powder gave powder foundation more good characteristics than the original flaky barium sulfate, TiO₂ powder, dimethicone in abovementioned optical and sensory properties. To characterize the distinctive features of this surface-modified powder, we measured its characteristics with UV in vitro tester, hiding powder test method, goniophotometer, consumer panel test and so on.

손가락 길이 비율(2D:4D)의 성차

최경호(Kyung Ho Choi),권선옥(Sun Ok Kwon) 한국발육발달학회 2007 한국발육발달학회지 Vol.15 No.3

Radar Detector용 Frequency Doubler의 설계에 관한 연구

최경호(Kyung-ho Choi),고민호(Min-ho Go),강석엽(Suk-yub Kang),박효달(Hyo-dal Park) 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.7