Introduction and Selection of Improved Open-Pollinated Maize Varieties in Zanzibar, Tanzania

Shin-Gu Kang,Yusuphu Juma Hamis,Mariam Juma Abdula,Soon-Kwon Kim,Tae-Seon Park,Min-Kyu Choi,Bon-Il Ku,Kyeong-Bo Lee,Hong-Kyu Park,Jae-Kwon Ko 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.1

탄자니아(United Republic of Tanzania)의 연방인 잔지바르의 옥수수 종자보급 개선을 목적으로 자유방임품종4종 (Tuxpeno-1,Staha, Situka, TMV-1)을 탄자니아 본토로부터 2006년도에 도입하여 키짐바니 농업연구소에서 적응시험을 수행하였다. Tuxpeno-1이 3.9 t ha-1로써 네 품종 중 수량이 가장 높았으며, Staha는 3.8 t ha-1, Situka는 3.0 t ha-1, 그리고 TMV-1은 2.0 t ha-1의 수량을 보였다. 이는 각 품종들의 잠재수량성(potential yield)과 비교하여 77%, 72%,67%, 그리고 47% 정도의 수량이다. 수량 차이가 많이 나는 이유로는 양분의 부족이 가장 큰 원인으로 판단된다. 잔지바르의 환경에서 생육이 부진한 TMV-1과 병해충 저항성이 약했던 Situka품종은 보급 품종에서 제외되었다. 키짐바니 농업연구소에서는 본시험 이후 Tuxpeno-1와 Staha 품종의 종자를 생산하여 농가에 보급하고 있다. To support maize seed program in Zanzibar, a semi-autonomous state of Tanzania, four improved open-pollinated maize varieties (OPVs) were introduced and tested at Kizimbani Agricultural Research Station (KARS) in 2006. In the different environment from Tanzania mainland, Tuxpeno-1 showed best performance with 3.9 t ha-1, followed by Staha (3.8 t ha-1), Situka (3.0 t ha-1), and TMV-1 (2.0 t ha-1). These results are over the average yield of Zanizbar, but less or more than the potential yield by 76%, 72%, 67%, 47%, respectively. It was understood that the lower yield was primarily due to less fertile soil. General growth of TMV-1 was poor, and Situka was revealed to be weak to pests and diseases in the island, so they were not recommended to farmers. KARS started to conduct seed multiplication and supply as a following up program for farmers.

Seroprevalence of maternal peripartum human T-cell lymphotropic virus type-1 infection: a systematic review and meta-analysis of the Nigerian literature

Abdulrasheed Usman,Muhammad Hamis Musa,Bukhari Isah Shuaib,Olayemi Balogun,Mukhtar Adeiza 대한소아청소년과학회 2023 Clinical and Experimental Pediatrics (CEP) Vol.66 No.7

연구보문 : 탄자니아 잔지바르에 도입한 개량된 옥수수 자유방임품종의 적응시험

강신구 ( Shin Gu Kang ),유수프주마하미스 ( Yusuphu Juma Hamis ),마리암주마압둘라 ( Mariam Juma Abdula ),김순권 ( Soon Kwon Kim ),박태선 ( Tae Seon Park ),이경보 ( Kyeong Bo Lee ),최민규 ( Min Kyu Choi ),구본일 ( Bon Il Ku ),박홍규 ( Hong 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.1

To support maize seed program in Zanzibar, a semi-autonomous state of Tanzania, four improved open-pollinated maize varieties (OPVs) were introduced and tested at Kizimbani Agricultural Research Station (KARS) in 2006. In the different environment from Tanzania mainland, Tuxpeno-1 showed best performance with 3.9 t ha-1, followed by Staha (3.8 t ha-1), Situka (3.0 t ha-1), and TMV-1 (2.0 t ha-1). These results are over the average yield of Zanizbar, but less or more than the potential yield by 76%, 72%, 67%, 47%, respectively. It was understood that the lower yield was primarily due to less fertile soil. General growth of TMV-1 was poor, and Situka was revealed to be weak to pests and diseases in the island, so they were not recommended to farmers. KARS started to conduct seed multiplication and supply as a following up program for farmers.

Design, Modeling and Control of a Simulator of an Aircraft Maneuver in the Wind Tunnel Using Cable Robot

Hami Tourajizadeh,Mahdi Yousefzadeh,Ali Keymasi Khalaji,Mahdi Bamdad 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.5

In this paper, a new controllable simulator is proposed and modeled by which, experimental tests of the aircraft’s models can be performed in wind tunnels with a high level of accuracy. These tests are unavoidable in order to extract the aerodynamic characteristics of the plant and optimize its related profiles. Drag and lift coefficients of the aircraft have a significant effect on the static and also dynamic maneuver of the airplane and thus evaluating these characteristics before manufacturing the aircraft are highly valuable in order to optimize the profile of their structures. To realize the mentioned target experimental tests can provide more accurate and trustable results rather than computer simulations. In order to conduct the wind tunnel tests with the highest accuracy, it is extremely significant to decrease any source of error such as disturbing drag forces. Thus it is required to control and manipulate the model of the aircraft with the aid of a mechanism that not only has the minimum effect on the drag force but also provides the least amount of deviation corresponding to drag forces. To do so, in this paper, a new cable robot is proposed as a proper candidate mechanism by which the disturbing drag force of the tunnel wind is minimum as a result of exact control of all of six spatial Degrees of Freedom (DOFs). Also, cables have the least cross-section area against the wind force and therefore the error of disturbing drags could be minimized. Moreover, there are other advantages for these kinds of robots such as low weight and cost, high load carrying capacity, and easy assembling capability. By proper design of the cables and actuators, it is possible to control all of the degrees of freedom of the end-effector during the dynamic maneuver of the aircraft and so it possible to perform all of the required static and dynamic tests of the plant. Therefore, in this paper first, the proper mechanism is designed and its related kinematics and kinetics modeling is provided. Besides, a robust controller is designed based on Non-Singular Fast Terminal Sliding Mode (NFTSM) to control the aircraft maneuver in presence of wind disturbance and complete the test process. All of the mentioned claims are verified by MATLAB simulations and the results confirm the mentioned expectancies.

리튬 이온전지 삼원계 층상구조 양극 활물질 연구 개발 동향

이하미(Hami Lee),심윤보(Yoonbo Sim),김기재(Kijae Kim) 한국세라믹학회 2023 세라미스트 Vol.26 No.2

The increased use of lithium-ion batteries in larger devices such as electric vehicles and energy storage devices has led to a need for improved battery performance. Researchers are developing cathode active materials with higher energy density, such as lithium phosphate and lithium transition metal compounds. Ternary cathode active materials with high capacity have also been developed, but there are issues with cation mixing and side reactions that can lead to reduced capacity, voltage drop, and even explosions. To address these issues, researchers are focusing on stabilizing and optimizing the cathode-electrolyte interface through methods such as coating with protective layers, cation or anion doping and changing of active materials structure. Herein, we briefly introduce and discuss the recent research with development trend of cathode material’s degradation solution for Li-ion batteries.

A polynomial chaos method to the analysis of the dynamic behavior of spur gear system

Guerine, A.,El Hami, A.,Fakhfakh, T.,Haddar, M. Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4

In this paper, we propose a new method for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters and this uncertainty must be considered in the analysis of the dynamic behavior of this system. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. It was found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.

Protective Effects of N-Acetylcysteine against Radiation-Induced Oral Mucositis In Vitro and In Vivo

김행준,강성운,이윤상,장전엽,Hami Kang,김철호 대한암학회 2020 Cancer Research and Treatment Vol.52 No.4

Purpose Radiation-induced oral mucositis limits delivery of high-dose radiation to targeted cancers. Therefore, it is necessary to develop a treatment strategy to alleviate radiation-induced oral mucositis during radiation therapy. We previously reported that inhibiting reactive oxygen species (ROS) generation suppresses autophagy. Irradiation induces autophagy, suggesting that antioxidant treatment may be used to inhibit radiation-induced oral mucositis. Materials and Methods We determined whether treatment with N-acetyl cysteine (NAC) could attenuate radiation-induced buccal mucosa damage in vitro and in vivo. The protective effects of NAC against oral mucositis were confirmed by transmission electron microscopy and immunocytochemistry. mRNA and protein levels of DNA damage and autophagy-related genes were measured by quantitative real-time polymerase chain reaction and western blot analysis, respectively. Results Rats manifesting radiation-induced oral mucositis showed decreased oral intake, loss of body weight, and low survival rate. NAC intake slightly increased oral intake, body weight, and the survival rate without statistical significance. However, histopathologic characteristics were markedly restored in NAC-treated irradiated rats. LC3B staining of rat buccal mucosa revealed that NAC treatment significantly decreased the number of radiation-induced autophagic cells. Further, NAC inhibited radiation-induced ROS generation and autophagy signaling. In vitro, NAC treatment significantly reduced the expression of NRF2, LC3B, p62, and Beclin-1 in keratinocytes compared with that after radiation treatment. Conclusion NAC treatment significantly inhibited radiation-induced autophagy in keratinocytes and rat buccal mucosa and may be a potentially safe and effective option for the prevention of radiation-induced buccal mucosa damage.

Disseminated Cryptococcosis Incorrectly Managed: a Case Report

Adil Maleb,Aziza Hami,Yassine Ben Lahlou,Somiya Lamrabat,Safaa Rifai,Nawal Rahmani,Mohammed Bensalah,Mohammed Frikh,Abdelhay Lemnouer,Mostafa Elouennass 대한의진균학회 2019 대한의진균학회지 Vol.24 No.1

Disseminated cryptococcosis is a rare fungal infection, which mainly occurs in immunocompromised patients, and the diagnosis is difficult. Therefore, it is less likely to be considered in immunocompetent patients. Here, we present a case of fatal cryptococcal infection of the pleural fluid and ascites in a patient seronegative for HIV. The patient was a 45-year old man who was followed for Crohn's disease and treated with steroids and an immunosuppressant (azathioprine). The culture of pleural and ascites fluids showed the presence of yeasts colonies identified as Cryptococcus neoformans. Bacteriological examination of the blood culture or cerebrospinal fluid (CSF) was not prescribed. The HIV serology was negative. At the fourth day of treatment, the patient died because of the deterioration of neurological and hepatocellular functions. The main diagnostic problems that led to this fatal outcome were non-suspicion of an at-risk patient, lack of microbiological analysis of the blood or CSF, and inadequate antifungal therapy.

A polynomial chaos method to the analysis of the dynamic behavior of spur gear system

A. Guerine,A. El Hami,T. Fakhfakh,M. Haddar 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4

In this paper, we propose a new method for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters and this uncertainty must be considered in the analysis of the dynamic behavior of this system. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. It was found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.

Substructure/fluid subdomain coupling method for large vibroacoustic problems

El Maani, Rabii,El Hami, Abdelkhalak,Radi, Bouchaib Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4

Dynamic analysis of complex and large structures may be costly from a numerical point of view. For coupled vibroacoustic finite element models, the importance of reducing the size becomes obvious because the fluid degrees of freedom must be added to the structural ones. In this paper, a component mode synthesis method is proposed for large vibroacoustic interaction problems. This method couples fluid subdomains and dynamical substructuring of Craig and Bampton type. The acoustic formulation is written in terms of the velocity potential, which implies several advantages: coupled algebraic systems remain symmetric, and a potential formulation allows a direct extension of Craig and Bampton's method to acoustics. Those properties make the proposed method easy to implement in an existing finite element code because the local numerical treatment of substructures and fluid subdomains is undifferentiated. Test cases are then presented for axisymmetric geometries. Numerical results tend to prove the validity and the efficiency of the proposed method.