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박주현,박제현,김탁현,연규훈,Park, Juhyun,Park, Jayhyun,Kim, Takhyun,Yeon, Gyuhun 한국지하수토양환경학회 2018 지하수토양환경 Vol.23 No.5
The Boroo area in Mongolia is known to have been contaminated with heavy metals due to irregular gold mining activities and the release of mercury from gold extraction process. Soil and mine tailings were collected to analyze contamination patterns of heavy metals in the Boroo area. Analyses revealed that mercury, arsenic and cadmium concentrations exceeded the regulatory standard of the nation (Mongolia National Standard). In case of mercury, about 80% of the survey area was over the limit and the concentration distribution heavily influenced by influx of mercury through water transport. Soil contamination by arsenic was most severe that the concentration exceeded the regulatory limit in almost entire survey area, showing peak concentrations at nearby streams and river along with ore processing facilities. For cadmium, about 20% of the survey area was over the limit with the concentration distribution similar to that of arsenic.
소비자 조사와 착의 실험을 통한 온도감응형 기능성 의류개발을 위한 기초연구
상정선 ( Jeong-seon Sang ),정경화 ( Kyunghwa Chung ),박주현 ( Juhyun Park ),오경화 ( Kyung Wha Oh ) 한국의류산업학회 2017 한국의류산업학회지 Vol.19 No.1
In this research, consumer awareness investigation and wearing test were carried out for obtaining useful data on the development of thermo-sensitive functional clothing material. A survey involved 216 people in Seoul and Kyeonggi- do, and 200 questionnaires data were analyzed by descriptive statistics and frequency using SPSS 17.0. Four healthy men in twenties were participated for wearing test. Subjects in normal loungewear were exposed to temperature change from the initial temperature 30oC down to 5oC for an hour in a climate chamber. The environmental temperature, surface temperature of garment and skin were measured. As a result, most of respondents have all season clothing products such as underwear, hosiery, and jogging suit for loungewear. Also, thermo regulator y functional clothes are frequently used as underwear and sweat shirt. The consumer awareness investigation on thermo regulatory functional clothing showed that the most important key buying factor is quick climate temperature response, easy maintenance, design and cost, in that order. Surface temperature of garment went down with the cooling down of environmental temperature. The lower environmental temperature, the greater temperature difference by body part showed. Skin temperature change by environmental temperature showed similar tendency of garment surface temperature. In comparison between garment surface and body skin, temperature difference became larger under the lower environmental temperature.
Wi-SUN 표준의 워킹 그룹 별 연구 주제 및 표준화 동향
박주현(JuHyun Park),이성원(SungWon Lee) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
제한적인 배터리 용량으로 동작하는 사물인터넷(IoT) 기기들을 위한 에너지 효율적인 프로토콜들이 연구, 표준화되고 있다. 특히 저전력으로 넓은 영역을 커버하는 저전력 장거리 (LPWA : Low-Power Wide Area) 기술이 주목받고 있으며 그 중 Wi-SUN(Wireless Smart Utility Networks) 은 대표적인 저전력 장거리 프로토콜 표준이다. 본 논문에서는 Wi-SUN의 Working Group별 연구 주제와 표준화 동향에 대해서 알아본다.
추진기관 시스템 시험설비 개발을 위한 해외사례 분석 및 적용방안
박주현(Juhyun Park),박순상(Soonsang Park),한영민(Yeoungmin Han),김지훈(Jihoon Kim) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
로켓 추진기관 시스템의 성능을 입증하기 위한 시험설비는 로켓시스템의 개발을 위한 필수 인프라이다. PSTC는 발사체의 각 단별 추진기관 시스템의 수류시험 및 연소시험을 수행하고, 발사 프로세스에 대한 지상검증을 수행한다. PSTC 개발을 위해 국내외 기술을 조사하여, 관련분야의 사례를 적극 활용한다. 추진기관 시험설비는 유공압 시설 및 제어계측, Test Stand, 화염유도로 등을 구성한다. The test facility for confirming performance of a propulsion system is essential infra-structure to develop launch vehicle system. Using the PSTC, cold flow and combustion tests are performed to the propulsion system of individual stage in launcher. Moreover the ground test for the total launching process is conducted. In order to construct the PSTC, we not only have surveyed technology of internal and external countries, but also actively use the case in terms of the system. The test facility consists of feeding system, test stand, control and measurement, and flame deflector.
단순 연화층 모델을 적용한 석탄 성상별 Coke Oven 내의 가스압 특성
박주현(Juhyun Park),최상민(Sangmin Choi) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A simplified model of plastic layer and internal gas pressure in a coke oven is presented. We calculate internal gas pressure using presented model. And results are compared with calculated results using experimental data. Results show the difference of internal gas pressure by coal composition. The model is used to show that the permeability at the resolidification end of the plastic layer is a key determinant of the magnitude of the internal gas pressure.
박주현(Park Juhyun),박용석(Park Yongsuk) 한국IT서비스학회 2018 한국IT서비스학회 학술대회 논문집 Vol.2018 No.-
본 논문에서는 회사의 비밀정보 유출자의 동기를 고려하여 애사심을 유도하는 일환의 자율적 보안관리의 체제를 수립하고, 통제적 보안관리 방안이 연계될 수 있도록 대안을 제시한다.