순환식 반응기에서 $TiO_{2}$ 광촉매를 이용한 Chromium(VI)의 제거에 미치는 영향인자에 대한 연구

김현용,조일형,이소진,기원주,이홍근,Kim, Hyun-Yong,Cho, Il-Hyoung,Lee, So-Jin,Ki, Won-Ju,Lee, Hong-Keun 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.3

This study was carried out the removal of Cr(VI) which was known to the toxic pollutant in industry using the process of UV and TiO$_2$ photocatalyst in a circular type reactor. In this experiment, the series of photocatalytic process for the removal of Cr(VI) has been selected as a model reaction in a circular type reactor in order to obtain the basic data on the influence of various experimental parameters such as circulation flow rate, pH of solution, initial Cr(VI) light illumination and TiO$_2$ dosage, and salicylic acid concentration. The results of this study were as follows; 1. With both UV light illumination and TiO$_2$ present, Cr(VI) was more effectively eliminated than with either UV or TiO$_2$ alone. 2. As the circulation flow rate of solution increased, the removal efficiency of Cr(VI) was increased. However, over 2.4 l/min of circulation flow rate, the efficiency wa limited. 3. A increase in the photocatalytic removal of Cr(VI) was noticed with decreasing pH. 4. An increase in the photocatalytic removal of Cr(VI) was noticed with decreasing Initial Cr(VI) concentration and first order kinetics was observed from the result at different initial concentration of Cr(VI). 5. Photocatalytic removal efficiency of Cr(VI) increased with increasing TiO$_2$ dosage. However, over 1.0 g/l of TiO$_2$ dosage, the efficiency reached a plateau. 6. As low concentration of saliculic acid were added, there was an increase in the removal efficiency of Cr(VI). However, over 300 mg/l of salicylic acid, the efficiecy was decreased. It eas found that application of photocatalysis to water treatment that contains both Cr(VI) and salicylic acid was possible.

우엉분말을 첨가한 쿠키의 품질특성

김현용,김경희,육홍선,Kim, Hyun-Yong,Kim, Kyoung-Hee,Yook, Hong-Sun 한국식품조리과학회 2017 한국식품조리과학회지 Vol.33 No.3

Purpose: The study investigated the quality characteristics of cookies prepared 0, 10, 20 and 30% burdock (Arctium lappa L.) powder. Methods: Cookies were manufactured with 0%, 10%, 20%, and 30% wheat flour substituted for burdock powder. Results: Density of the dough showed no significant differences with increasing amount of burdock powder, whereas pH of the dough decreased with increasing burdock powder content. The pH of cookies decreased with increasing burdock powder content, whereas $^{\circ}brix$ of cookies increased with burdock powder content. The moisture contents of cookies increased with increasing burdock powder content. The spreadability of cookies decreased with increasing burdock powder content. The L-value of cookies decreased, a-value increased, and b-value decreased with increasing burdock powder content. The hardness of cookies decreased with increasing burdock powder content. Total polyphenol contents and DPPH radical scavenging activity increased with increasing burdock powder content (p<0.05). In the sensory evaluation, appearance, color, flavor, and texture were highest in the control group, whereas sweet taste and savory taste were highest in the added group. For overall acceptance of cookies, 10% burdock powder cookies showed higher values than the control and other samples. Conclusion: Results suggest that cookies manufactured with 10% burdock powder are the most optimal product.

원유가 상승이 근해어업의 경영수지에 미치는 파급효과 분석

김현용(Hyun Yong Kim),강연실(Yeun Sil Kang),김현용(Hyun Yong Kim) 한국수산경영학회 2001 수산경영론집 Vol.32 No.1

The study, using the input-output analysis of 402 industrial sectors by Bank of Korea(BOK) and the resulting outcomes of price model, aims to evaluate the spillover effects the international fluctuations in crude oil prices have on the commodities prices and consequently, analyse the management and profitability of the offshore fisheries in Korea. At present, the fishermen are provided with tax-free oils for their fishing operations as specified under the Special Tax Treatment Control Law. However, the exhaustion of marine resources and new international fisheries agreements, which resulted in the loss of fishing grounds, made the stable catch even more unpredictable and the hike in the price of the international crude oil would have adverse effects on the fishing industry. The study revealed that the increasing rise in the price of crude oil would exert sweeping spillover effects on other industry sectors in general and accordingly, lead to a poorer performance by fisheries. The price spillover coefficients for the diesel oil was 0.6026, which would translate into the 42.6% increase in the prices of oil when the increase ratio of 73.3% for the base crude oil was applied based on the calculation methods employed in the study. This in turn increased the ratio of diesel oil required in the offshore fisheries from 23.3% to 16.6%, diminishing the ratio of current net profits to minus 2.0% from 4.2% otherwise. By fishing type, the Pair Trawl suffered current net profits loss most by ratio of minus 9.4% and other fisheries such as Coastal Stow Nets, Coastal Angling, Danish Sein also suffered ratio of 7% and more in the loss of current net profits. With the deteriorating fishing performance, coupled with the increasing international crude oil prices, it is urgently required that the authorities concerned deliberate in depth on such schemes as follows in efforts to secure stable fishing production. First, provision of large-scale storage facilities for oil is needed to timely adapt to the fluctuations in international crude oil prices. Secondly, in line with the stabilization of tax-free oil prices, duty levied on oils for fishing and tax collected from the refineries need to be tax-exempt. Thirdly, the beneficiaries from the provision of tax-free oil should be broadened, not limited to special fishing operation only. Fourth, investment in stabilization of the oil prices should be encouraged, possibly through funding from the formation of fisheries development funds underway.

B2B제휴를 통한 기업체 임직원의 재무상담 사례연구

김현용(Hyun Yong Kim) 한국FP학회 2011 Financial Planning Review Vol.4 No.3

본 연구는 재무설계 회사와 기업체가 임직원을 위한 재무설계 서비스를 제공하는 B2B(Business to Business)협약을 체결한 뒤, 해당 재무설계 회사의 소속 재무설계사가 재무설계 신청자를 대상으로 재무설계 서비스를 진행하는 프로세스(이하 ‘기업 재무설계’로 칭함)를 다뤘다. 기업 재무설계는 재무설계사와 상담고객의 사이에 기업체가 개입함으로써 전통적인 의미의 개인 재무상담에 비해 관계정립을 비롯한 6단계 프로세스 전 과정에 거쳐 고려해야 할 변수들이 생긴다. 본 사례를 통해 이런 변수들에 어떻게 대응하고, 재무설계 6단계 프로세스를 효과적으로 적용할 수 있는지 살펴본다. 기업 재무설계를 통해 고객은 재무적 안정성의 강화로 본인의 직무에 좀 더 충실할 수 있고 소속회사에 대한 만족감이 커지는 효과가 있으며, 이는 기업체의 입장에서 WLB(Work-Life-Balance) Program에 재무설계가 중요한 역할을 할 수 있음을 의미한다. 아울러 재무설계사는 자발적 신청자를 대상으로 고객과의 관계정립이 용이하고, 동일직장 동일직군에 대한 상담 경험이 누적되면서 특정 고객층에 대한 전문성이 강화되는 효과를 가진다. 기업의 사회적 영향력을 감안할 때 기존 금융상품 판매과정에서 비롯된 재무설계에 대한 오해를 불식하고, 정확한 프로세스에 입각한 유료 재무설계 서비스를 대중화시키는 데 큰 효과를 볼 수 있다. 본격적인 기업 재무설계 시장이 열리고 있는 지금, 재무설계사의 시행착오를 줄이고, 현실적인 상담 사례의 공유를 통해 재무설계 시장의 새로운 지평을 열어나가는 데 큰 시사점을 줄 수 있으리라 생각한다. This case deals with a financial planning example based on a B2B agreement between a financial planning company and a business (employer of a client). For B2B financial planning, the employer is involved in the financial planning process as a third-party entity apart from the planner and a client. Therefore, the traditional six-step financial planning process can be modified to meet the employer’s needs. This case presents examples and possible solutions of such situations in B2B financial planning. B2B financial planning can be beneficial for both the employer and employees. Employees can have higher levels of job-satisfaction and loyalty to the employer because their personal financial situation could be improved after receiving financial planning services from professionals. Employers can use B2B financial planning as a part of a Work-Life balance Program for their employees. Financial planners can also take advantages of B2B financial planning. Most of the clients voluntarily signed up to receive B2B financial planning and this voluntary participation contributed to the relationship building between the planner and the client. B2B financial planning can play a significant role in improving the professional image of financial planners and introducing fee-based financial planning to the general public. It is hoped that this case can provide useful information in the B2B financial planning field, especially on how to expand financial planning markets in a highly competitive financial environment.

YOLO를 이용한 공사 현장 작업자의 보호장구 착용여부 및 위험지역 진입여부 검출

김현용(Hyun-Yong Kim),박태형(Tae-Hyoung Park) 대한전기학회 2021 정보 및 제어 심포지엄 논문집 Vol.2021 No.10

히스토그램을 이용한 Alignment Marker 인식 알고리즘 구현

김현용(Hyun Yong Kim),문창배(Chang Bae Moon),송영준(Young Jun Song),정해(Hae Chung),김병만(Byeong Man Kim),전성배(Seong Bae Joen) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.11

절차지향 개발 패러다임에서 Pipe & Filter 패턴을 이용한 개발 프로세스 단순화 전략

김현용 ( Kim Hyun Yong ),김순태 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1

많은 embedded 소프트웨어는 전통적 절차적 언어인 C로 작성되며 embedded 시스템에 특화된 역할을 수행한다. 한편 기존 절차적 언어인 C는 현대의 객체지향적 개발 패러다임과 비교하면 코드의 확장성, 유지 보수성, 재사용성에 있어서 많은 어려움이 있으며 아직도 많이 사용하고 있지만 이 C의 유지 보수성과 확장성, 유연성을 확보하여 보다 생산적이고 유지 보수가 쉬운 패러다임으로서 함수 pooling이라는 개념과 이를 이용한 framework를 구현한다.

Biphenyl 계 에폭시 / Phenol Novolac 수지 조성물의 화학레올로지 연구

김현용(Hyun Yong Kim),문경식(Kyoung Sik Moon),한승(Seung Han),김진모(Jin Mo Kim),유제홍(Je Hong Ryu),윤호규(Ho Gyu Yoon) 한국고분자학회 1999 폴리머 Vol.23 No.1

TiO₂를 이용한 Humic Acid의 광촉매분해에 대한 영향인자에 관한 연구

김현용(Hyun Yong Kim),조일형(Il Hyoung Cho),이홍근(Hong Keun Lee) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.2

The photocatalytic degradation of humic acid which is precursor of trihalomethanes (THMs) formed after chlorination was carried out in aqueous suspensions of TiO₂ as photocatalyst by illumination with UV light. Comparison of UV photolysis, TiO₂ adsorption and UV/TiO₂ phtocatalysis as well as the effect of reaction conditions such as UV intensity, TiO₂ dosage and H₂O₂ concentration on the degradation of humic acid was examined. The major results of this study were as follows: 1. With both UV illumination and TiO₂ present, humic acid was more effectively degraded than UV or TiO₂ alone and degradation efficiency of humic acid by Photocatalysis was 76.2%. 2. Photocatalytic Degradation of humic acid increased linearly with increasing UV light intensity. 3. Degradation efficiency of humic acid increased with increasing TiO₂ dosage. However, over 2 gll of TiO₂ dosage, the efficiency was limited because UV light is blocked by catalyst itself. 4. Addition of H₂O₂ as oxidant enhanced the efficiency of photocatalytic degradation on humic acid but the degradation efficiency reached a plateau over 500 mgll of H₂O₂

Fast Handover 메커니즘을 사용한 Hierarchical Mobile IPv6 의 성능 분석

김현용 ( Hyun-yong Kim ),김홍식 ( Hong-sik Kim ),정요셉 ( Joseph Jung ),송주석 ( Joo-seok Song ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.1

무선망을 통해 인터넷(IP) 접근이 가능한 모바일 장치가 증가하고 있다. 그러나 기존의 IP 프로토콜은 이동성을 고려하지 않고 있기 때문에 IP 에 이동성을 부여한 Mobile IP 프로토콜이 제안되었다. Mobile IP 는 홈네트워크에 홈에이전트를 두어 모바일 장치에 이동성을 제공한다. 그러나 기존 Mobile IP 는 홈네트워크 등록 및 주소 재설정에 따른 핸드오프 지연 시간이 비교적 크다. 이를 해결하기 위해 새로운 모델이 제안되었다. 한 도메인을 담당하는 새로운 노드를 두어 등록에 따른 지연 시간을 줄인 Hierarchical Mobile IPv6 와 주소 재설정에 따른 지연 시간을 줄인 Fast Handover 메커니즘이 바로 그것이다. 이 논문에서는 Hierarchical Mobile IPv6 에 Fast Handover 메커니즘을 적용해보고, 핸드오프 지연 시간 및 end-to-end 간의 통신 성능을 시뮬레이션을 통해 평가해본다. 그리고 기존의 방법과 비교하여 성능 향상 정도를 알아본다.